JB/T 6727-2000 Internal combustion engine crankshaft technical conditions
Some standard content:
ICS27.020
J92
JB
Machinery Industry Standard of the People's Republic of China
JB/T6727—2000
Internal combustion engine crankshaft
Technical conditions
Reciprocating internal combustion enginesSpecificationsforcrankshaft
Released on 2000-08-31
National Machinery Industry Bureau
Released
Implemented on 2001-01-01||tt| |JB/T6727-2000
Foreword
This standard is a revision of JB/T6727--93 "Technical Conditions for Internal Combustion Engine Crankshafts". During the revision, editorial changes were made to the original standard, and Appendix A was added. The main technical content remains consistent with the original standard. This standard replaces JB/T6727-93 from the date of implementation. Appendix A of this standard is an appendix to the standard.
This standard is proposed and coordinated by the National Internal Combustion Engine Standardization Technical Committee. This standard was drafted by: Shanghai Internal Combustion Engine Research Institute, Wendeng Tianrun Crankshaft Co., Ltd. The main drafters of this standard: Li Shaoqiu, Sun Haitao, Yu Qiuming, Xing Guoyong, Sun Jun. This standard was first published in 1964 as NJ24--64, revised for the first time in 1974, for the second time in 1986, and for the third time in 1993 as JB/T6727-93.
1 Scope
Machinery Industry Standards of the People's Republic of China
Technical Conditions for Internal Combustion Engine Crankshafts
Reciprocating internal combustion enginesSpecifications for crankshaftJB/T 6727-2000
Replace JB /T6727-93
This standard specifies the technical requirements, inspection methods, inspection rules and markings, packaging, transportation and storage of internal combustion engine crankshafts. This standard applies to reciprocating internal combustion engine crankshafts with a cylinder diameter less than or equal to 200mm. 2 Referenced standards
The provisions contained in the following standards constitute provisions of this standard by being quoted in this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision and parties using this standard should explore the possibility of using the latest version of the standard listed below. GB/T 223.3---1988
GB/T 223.4—1988
GB/T 223.5—1.997
GB/T223.72-1991
GB/T 223.74--1997
GB/T 225---1988
GB/T228—1987
GB/T229—1994
GB/T 230—-1991| |tt||GB/T 231--1984
GB/T 699—1999
GB/T1184—1996
GB/T 1348—1988
GB/ T1800.3—1998
GB/T1958—1980
GB/r 2828---1987
GB/T2829—1987
GB/T3077—1999|| tt||GB/T4340.1—1999
GB/T 5617-1985
GB/T 9441-1988
GB/T10561--1989
Steel and Methods for chemical analysis of alloys. Determination of phosphorus content by diantipyrine methane phosphomolybdic acid gravimetric method. Determination of phosphorus content by ammonium nitrate oxidation volumetric method for steel and alloys. Chemical analysis methods for determination of manganese content by ammonium nitrate oxidation volumetric method. Determination of acid-soluble silicon by reduced silicate molybdenum photometric method. Content Chemical analysis methods for steel and alloys Alumina chromatography-Barium sulfate gravimetric method Determination of sulfur content Chemical analysis methods for steel and alloys Determination of uncombined carbon content Hardenability of steel End quenching test method
Metal tensile test Method
Metal Charpy notch impact test method
Metal Rockwell hardness test method
Metal Brinell hardness test method
High quality carbon structural steel
Shape and position tolerances without tolerance values ??
Ductile iron castings
Limits and fit basis Part 3: Standard tolerance and basic deviation value table shape and position tolerance testing regulations
Batch by batch Inspection and counting sampling procedures and sampling tables (applicable to the inspection of continuous batches) Periodic inspection and counting sampling procedures and sampling tables (applicable to the inspection of production process stability) Alloy structural steel
Metal Vickers hardness test Part 1 test Method Determination of effective hardened layer depth after induction quenching or flame quenching of steel Metallographic examination of ductile iron
Microscopic evaluation method of non-metallic inclusions in steel National Machinery Industry Bureau 2000-08-31 Approved 2001-01-01 Implementation
-
GB/T 11354—1989
GB/T13299-1991
GB/T13320-1991
JB/T6729-1993|| tt||JB/T 9204-1999
JB/T9205—1999
JB/T9773.1—1999
QC/T525—1999
YB/T 5148 --1993
3 Technical Requirements
JB/T6727-2000
Method for determination of nitrided layer depth and metallographic structure inspection of steel parts and microstructural evaluation of steel
Metallographic structure rating diagram and assessment method of steel die forgings Internal combustion engine crankshaft, camshaft Magnetic particle inspection
Induction quenching metallographic inspection of steel parts
Induction Pinghuo metallographic inspection of pearlitic ductile iron parts Diesel engine bench Test and assessment methods
Automobile engine reliability test method
Metal average grain size determination method
3.1 The crankshaft shall be manufactured according to the product drawings and technical documents approved by the prescribed procedures. 3.2 Crankshaft material
3.2.1 Forged steel crankshaft (this standard includes tempered steel and normalized steel) 3.2.1.1 Forged steel crankshaft should be 45 steel specified in GB/T699 or 45 steel specified in GB3077 Made of 45Mn2, 35CrMo, 40Cr alloy steel, or other steel materials with mechanical properties not lower than the above grades. 3.2.1.2 Material requirements for forged steel crankshaft
a) The carbon content of the steel should be selected. According to the provisions of GB/T3077 and GB/T699, the range of carbon content should be narrowed from the two poles to the middle. to less than or equal to 0.05%. The sulfur and phosphorus content of steel should be less than or equal to 0.025%; b) The standard purity of non-metallic inclusion content of steel shall be rated according to I-JK in GBT10561. Each item of Category A and B is less than or equal to level 2.5, each item of Category C and D is less than or equal to level 1, and the total amount is less than or equal to level 5; c) The hardenability of steel should be measured according to GB/T225, and its Ping The permeability curve should be within the range of the permeability curve of the steel grade used. 3.2.1.3 Steel crankshaft forgings
a) The forging ratio of the forgings is not less than 2.
b) The shape, dimensional deviation and machining allowance of the crankshaft forgings shall be accepted according to the drawings (product drawings and rough drawings). c) The depth of pits, pits, bruises and other defects on the non-machined surface of crankshaft forgings is less than or equal to 1/3 of the thickness tolerance. Defects such as folds and cracks on the non-processed surface are allowed to be eliminated by grinding. The grinding surface must have a smooth transition. The grinding width should be greater than or equal to 6 times the grinding depth. The grinding length should be more than 3mm beyond the length at both ends. The grinding depth should be less than or equal to the thickness tolerance. 1/3. The machined surface defects shall not exceed 12% of the actual roughing allowance. It is not allowed to use the methods of pressing and welding repair to eliminate the defect of crankshaft roughness. For forged steel crankshafts with balance weights, welding repairs are allowed on the non-filled portion of the top of the balance weight, and the strength of the welding repair should not be lower than the strength of other parts of the crankshaft balance weight. Flaw detection should be carried out after repair welding.
d) The crankshaft forgings are not allowed to be over-burned, and the depth of the surface decarburization layer is not allowed to exceed 0.70mm. e) The straightness of the common axis of each main journal of the crankshaft forging is less than or equal to @3.0mm per 1000mm of crankshaft length. When the straightness is Φ3.0~Φ5.0mm per 1000mm of crankshaft length, it is allowed to be corrected to the specified value. After correction, it should Eliminate internal stress. 3.2.1.4. The hardness of normalized crankshaft forgings is 163~241HBS, and the hardness difference of the same crankshaft should be less than or equal to 50HBS. The structure after normalizing should meet the following requirements: a) The grain size should be in the range of 4 to 10 in the series of pictures I specified in YB/T5148, and the uneven hook degree of the grains should be less than or equal to level 3; 2
JB /T6727—2000
b) Widmanstatten structure specified in GB/T13299 is not allowed, and the band structure is less than or equal to level 1. 3.2.1.5 The quenched and tempered crankshaft forgings have a quenched and tempered hardness of 207~302HBS. The hardness difference of the same crankshaft should be less than or equal to 50HBS. The metallographic microstructure of the matrix after quenching and tempering is sorbite (its depth is determined by the chemical composition of the material, the diameter of the workpiece, etc.). It is evaluated according to GB/T13320, and grades 1 to 4 are qualified.
3.2.1.6 After heat treatment, crankshaft forgings should be shot blasted or sand blasted. 3.2.2 Ductile iron crankshaft
3.2.2.1 The ductile iron crankshaft should be made according to the regulations in GB/T1348 and is generally made of ductile iron no less than QT700-2. The ductile iron crankshaft of the internal combustion engine whose calibrated speed is lower than 1500r/min can be made of ductile iron not lower than QT600--3. 3.2.2.2 The hardness of normalized crankshaft castings is 230~300HBS, and the hardness difference of the same crankshaft should be less than or equal to 50HBS. The structure after normalizing should be in accordance with GB/T9441 and meet the following requirements: a) The graphite spheroidization level should be 1~3;
b) The graphite spherical diameter should be 5~8; ||tt ||c) The pearlite content should not be lower than Pearl Grade 85, and the pearlite content of the crankshaft that requires surface treatment may not be lower than Pearl Grade 75; d) Less than or equal to 2% of free cementite and less than or equal to 1.5 are allowed % phosphorus eutectic exists, but its total amount should be less than or equal to 3%
3.2.2.3 The hardness of the crankshaft after isothermal fire treatment is 35~48HRC, and the hardness difference of the same crankshaft should be less than or equal to 6HRC (except Unless otherwise noted on the drawing). The metallographic structure after isothermal quenching is evaluated according to GB/T9441 and Appendix A (standard appendix). The following requirements are met in the area within 3mm from the surface:
a) The graphite spheroidization level should be level 1~3;
b) The graphite sphere diameter should be level 5~8;|| tt||c) It is allowed to have no more than 2% free cementite and less than or equal to 1.5% phosphorus eutectic, but the total amount is less than or equal to 3%; d) The grade of bainite structure should not be lower than Level 3; e) The quantity level of the white area should not be lower than level 2; f) The quantity level of ferrite should not be lower than level 1; more) The core structure is allowed to be sorbite + troostite + a small amount of ferrite, However, undissolved ferrite is not allowed to exist. 3.2.2.4 After heat treatment, castings should be shot blasted or sand blasted. 3.3 Surface treatment of crankshaft
3.3.1 Medium (high) frequency quenching of crankshaft journal surface 3.3.1.1, the depth of the hardened layer D on the surface of steel crankshaft journal is 2.0~4.5mm, measured according to GB/T5617 . The hardness of the hardened layer after tempering is 55~63HRC for 45 steel. According to the product drawing, alloy steel is generally not less than 50HRC and is within the hardness range of the steel type. The hardness difference of the same crankshaft should be less than or equal to 6HRC. The metallographic microstructure of the hardened layer is fine needle-like martensite, which is evaluated according to JB/T9204, and grades 3 to 7 are considered qualified.
3.3.1.2 The surface of the ductile iron crankshaft journal should be tempered after medium (high) frequency quenching. The depth of the hardened layer D is 1.5~4.5mm; the hardness of the hardened layer is 42-55HRC. The hardness difference on the same crankshaft should be less than or equal to .6HRC. The metallographic microstructure of the hardened layer is evaluated according to JB/9205, and grades 3 to 6 are considered qualified.
3.3.1.3 The distribution of the hard layer in the axial direction of the journal is generally shown in Figure 1. The quenching zone a shall not be less than the total length of the journal (including 50% of the transition fillet). The two ends of the quenching zone are 2 mm from the connection between the journal and the transition fillet. The journal is allowed to be hardened together with the fillet. 3
JB/T6727-2000
a—Zer hard area: b Non-Ping hard area (≥R+2mm): R—Transition fillet radius Figure 1
3.3.2 Crankshaft nitriding treatment (gas Soft nitriding, liquid nitriding, ion ammoniation) 3.3.2.1 The depth and hardness of the nitriding layer are shown in Table 1. Table
Nitriding treatment types
Gas nitriding, liquid nitriding
Ion nitriding
Nitride layer depth
mm
20.10
≥0.15
The brittleness, looseness and nitrogen content of the nitride layer The chemical form is evaluated according to GB/T11354. 3.3.2.23 After nitriding treatment, the journal surface should be polished. 3.3.3 For crankshafts using rolling bearings, the surface hardness is specified in the product drawing. The interface with the oil passage hole should be blunt and polished. The surface hardness is
HVo.1
420
≥500
3.5 for the main journal and connecting rod journal. The transition fillet of the crank connection should be smooth, and there should be no obvious joint marks at the connection. 3.6 The crankshaft processing surface roughness R should comply with the requirements of Table 2. Table 2
itembZxz.net
month|| tt||Main journal and connecting rod journal
Journal transition fillet
Thrust boss end face
Journal oil passage orifice
With inner ring The main journal of the rolling bearing
3.7 The main size and shape position tolerance of the crankshaft Non-nitrided crankshaft
Steel 0.40, BM cast iron 0.63
0.63
0.63||tt ||1.25
1.25
Nitrided crankshaft
0.63
1.25
1.25
1.25
1.25||tt ||um
3.7.1 The diameter tolerance level of the main journal and connecting rod journal shall be manufactured according to [T6] in Table 1 of GB/T1800.3-1998. The nitrided crankshaft is allowed to be enlarged by 0.01mm compared with IT6 || tt||3.7.2 The cylindricity of the main journal and connecting rod journal is manufactured according to level 7 in Table B2 of GB/T1184-1996. The dimensional tolerance of the axis distance between the main journal and connecting rod journal is 0.10mm. tt||3.7.4 The parallelism of the connecting rod journal axis to the common axis of the main journal at both ends is specified in GB/T1184-1996 Table B3 Level 3.7.5
|tt||When the crankshaft is supported by main journals at both ends, the circular runout tolerance level of each journal and the end facing the common axis of the main journal should comply with the JB/T6727--2000
6-cylinder engine and The crankshaft above it is allowed to use intermediate auxiliary supports. For the crankshaft after nitriding treatment, based on the tolerance level specified in Table 3, the crankshaft of 2 to 5-cylinder engines is allowed to increase by 0.02mm, and the crankshaft of 6-cylinder and above engines is allowed to increase by 0.03mm. . Table 3
serial number
t
3
7
item
item
crankshaft intermediate main journal||tt ||Install the Baodong gear journal
Install the cylindrical or tapered shaft at the flywheel end
The end face of the correcting table
Install the flywheel end face
Install the oil seal journal
Install the fan pulley journal
! The combined crankshaft is required according to the product drawing. 2Tolerance level is in accordance with GB/T1184.
Tolerance level
8
8
8
8
3.7.6 The keyway center of the timing gear mounted on the crankshaft faces the first The angle deviation of the plane formed by the first connecting rod journal axis and the main journal axis is ±30°. 3.7.7 The plane formed by the connecting rod journal axis and the main journal axis on the crankshaft is composed of the first connecting rod journal axis and the main journal axis. The angle deviation of the plane is ±20°.
3.7.8 The end face of the crankshaft connected to the flywheel should be flat, with a flatness tolerance of 0.05mm, and there should be no bulges on the surface. 3.8 Each crankshaft should undergo a balance test. Single cylinders, double cylinders and crankshafts with a speed less than 1000r/min are allowed to undergo only static balance tests, while the rest are subject to dynamic balance tests. The static and dynamic unbalance amounts are specified in the product drawing. 3.9 The working surface of the crankshaft should be smooth and clean, and no scratches, rust, dents and other visible casting, forging and processing defects are allowed. 3.10 The crankshaft shall undergo magnetic particle inspection according to the provisions of JB/T6729. Metal shavings and debris in the crankshaft lubricating oil passage and in various parts should be removed to ensure that the oil passage is clean and smooth. 3.11
3.12 The crankshaft needs to pass the body bending fatigue test and should reach the safety factor when the crankshaft is designed. 3.13 The crankshaft should undergo durability testing in accordance with JB/T9773.1 or QC/T525. The wear amount of its main journal and connecting rod journal should not be greater than 0.025mmg
3.14 The service life should not be less than that of the crankshaft. The service life of the internal combustion engine. 3.15 The crankshaft warranty period should comply with the relevant provisions of the manufacturer's three-guarantee commitment. 4 Inspection methods
4.1 Chemical composition
According to the provisions of GB/T223.3, GB/T223.4, GB/T223.5, GB/T223.72 and GB/T223.74, or with Other methods of equal accuracy.
4.2 Body hardness
4.2.1 Sampling location: Take samples from the crankshaft body, or samples from the same heat and package as the crankshaft for sampling. 4.2.2 Inspection method: According to the provisions of GBT231. 4.3 Mechanical properties
JE/T 6727-2000
4.3.1 Sampling location: Take samples from the crankshaft body, or samples from the same heat and package as the crankshaft for sampling. 4.3.2 The tensile test shall be in accordance with the provisions of GB/T228 and GB/T1348, and the impact test shall be in accordance with the provisions of GB/T229. 4.4 Depth of hardened layer
4.4.1 Sampling location: Cut the journal radially from the main journal and connecting rod journal 4mm away from the crank arms at both ends, and then cut radially in the middle of the removed journal.
4.4.2 Inspection method
4.4.2.1 Corrosion method: Use 3%~5% nitric acid alcohol solution to corrode, and then use a vernier caliper to measure the depth of the hardened layer. 4.4.2.2 Metallographic method: Cut the metallographic test block radially from the middle of the journal, grind the metallographic sample, and measure the depth of the hardened layer under a 100x metallographic microscope.
4.4.2.3 Hardness method: measured according to GB/T5617. When the measurement results of the above three methods are inconsistent, the hardness method shall prevail. 4.5 Surface hardness and hardened layer width
4.5.1 Sampling location: Cut the journals radially from the main journal and connecting rod journal 4mm away from the crank arms at both ends. 4.5.2 Inspection method
4.5.2.1 Hardness method: According to the provisions of GB/T230, measure the surface hardness along the axial direction of the sample, and then use a vernier caliper to measure the size range of the specified hardness, which is the width of the hardened layer.
4.5.2.2 Corrosion method: Cut the above sample through the axis, then etch the cut surface with 3%~5% nitric acid alcohol solution, and measure the width of the hardened layer with a vernier caliper.
If there is any conflict between the measurement results of the above two methods, the hardness method shall prevail. 4.6 Depth of nitriding layer and surface hardness of nitrided crankshaft 4.6.1 Sampling location: Cut metallographic samples radially from the middle position of the journal or samples of the same treatment and heat. If there is any conflict between the two, the original sample shall prevail.
4.6.2 Inspection method
4.6.2.1 The depth of the nitride layer can be in accordance with the provisions of GB/T11354, or it can be corroded with 3%~5% nitric acid alcohol solution and then metallographically examined at 100 times or 200 times Measure under a microscope, or use thermal dyeing to measure the depth of the nitride layer under a 100x or 200x metallographic microscope. If there is any conflict between the three methods, the hardness method shall prevail.
4.6.2.2 Surface hardness is measured according to the provisions of GB/T4340.1. 4.7 Metallographic microstructure
4.7.1 Sampling location: Same as 4.6.1 or 4.6.2. 4.7.2 Test method: According to GB/T13320, GB/T9441, GB/T11354, JB/T9204, JB/T9205 and the provisions of Appendix A of this standard.
4.8 Surface roughness
4.8.1 The surface roughness of the main journal and connecting rod journal is measured with a surface roughness meter. Other methods are also allowed. -4.8.2 The surface roughness of the journal transition fillet and the oil passage opening of the journal is measured by sample comparison measurement or other methods. 4.9 Dimensions
4.9.1 The diameter of the main journal and connecting rod journal should be measured with a measuring tool with an accuracy of not less than ±0.004mm. 4.9.2 The plane composed of the center surface of the gear keyway, the axis of each connecting rod journal and the axis of the main journal is composed of the axis of the first connecting rod journal and the axis of the main journal 6
JB/T6727—2000
The angular deviation of the plane should be measured with a standard V-shaped iron support on the zero-level flat plate, using a height ruler, fourth grade gauge, lever dial indicator or digital dry meter.
4.10 Shape and position tolerances
The shape and position tolerances of each machined part on the crankshaft shall be inspected in accordance with GB/T1958. 4.11 Surface quality inspection
The surface quality of the crankshaft should be observed with the naked eye.
4.12 The dynamic balance of the crankshaft is measured with a dynamic balancing machine, and the static balance is measured with a special device. 4.13 Magnetic particle inspection shall be carried out in accordance with the provisions of JB/T6729. 4.14 The crankshaft fatigue test shall be carried out in accordance with the product drawings or relevant technical documents. 4.15 Non-destructive testing can also be performed on the metallographic structure, hardness and internal defects of the crankshaft. 5 Inspection Rules
5.1 Each crankshaft must be inspected by the quality inspection department of the manufacturer before leaving the factory. 5.2 The manufacturer should conduct regular random inspections of crankshafts. The random inspection items are 3.2~3.10. The random inspection results should meet the above requirements. 5.3 The period of regular sampling inspection shall be determined by the relevant departments of the manufacturer. 5.4 When the ordering unit randomly inspects the quality of the crankshaft, the sampling inspection method shall be in accordance with the provisions of GB/T2828 or GB/2829, or shall be determined through consultation between the ordering unit and the manufacturer.
5.5 The manufacturer is responsible for conducting random inspections of various tests, and the user can re-test as needed. 6 Marking, packaging, transportation and storage
Crankshafts that have passed the inspection should be marked with the manufacturer's factory mark or trademark. The location, size and method of the mark shall be specified in the product drawing. 6.1
6.2 All crankshafts that pass the inspection shall be accompanied by a product quality certificate signed by the inspector. The certificate should be marked with:
a) Manufacturer’s name and trademark;
b) Internal combustion engine model, part name and part number; c) Inspection date and inspector’s signature; ||tt| |d) Execution standard number.
6.3 The crankshaft must be cleaned and oil-sealed or subjected to other anti-corrosion treatments before packaging to ensure that the parts will not be damaged during normal transportation. The total mass of the box shall not exceed 50kg (this restriction is not applicable when packaging in a single piece). 6.4 The packaging box should be accompanied by a packaging list signed by the manufacturer's inspector and packer. The internal combustion engine model, parts name and quantity should be indicated on the list.
6.5 The outer surface of the packaging box should be marked:
a) Manufacturer’s name, trademark and address;
b) Internal combustion engine model and part name;
c) Packing Date, total mass and quantity;
d) "Handle with care", "Moisture-proof" and other words or signs. 6.6 The crankshaft should be stored in a ventilated and dry warehouse. Under normal storage conditions, the manufacturer should ensure that the crankshaft will not rust within 12 months from the date of shipment.
A
1 Sampling location: radially cut the journals at the main journal and connecting rod journal 4mm away from the crank arms at both ends. 4.5.2 Inspection method
4.5.2.1 Hardness method: According to the provisions of GB/T230, measure the surface hardness along the axial direction of the sample, and then use a vernier caliper to measure the size range of the specified hardness, which is the width of the hardened layer.
4.5.2.2 Corrosion method: cut the above sample through the axis, and then etch it with 3%~5% nitric acid alcohol solution on the cut surface, and use a vernier caliper to measure the width of the hardened layer.
When the measurement results of the above two methods are inconsistent, the hardness method shall prevail. 4.6 Nitriding layer depth and surface hardness of nitrided crankshafts4.6.1 Sampling location: radially cut the metallographic sample or the sample of the same treatment and the same batch at the middle position of the journal. When there is a contradiction between the two methods, the body sample shall prevail.
4.6.2 Inspection method
4.6.2.1 The depth of the nitriding layer can be measured according to the provisions of GB/T11354, or can be measured under a 100x or 200x metallographic microscope after being corroded with a 3%~5% nitric acid alcohol solution, or measured under a 100x or 200x metallographic microscope by the thermal dyeing method. When there is a conflict between the three methods, the hardness method shall prevail.
4.6.2.2 The surface hardness shall be measured according to the provisions of GB/T4340.1. 4.7 Metallographic microstructure
4.7.1 Sampling location: Same as 4.6.1 or 4.6.2. 4.7.2 Test method: According to the provisions of GB/T13320, GB/T9441, GB/T11354, JB/T9204, JB/T9205 and Appendix A of this standard.
4.8 Surface roughness
4.8.1 The surface roughness of the main journal and connecting rod journal shall be measured by a surface roughness meter, and other methods are also allowed. -4.8.2 The surface roughness of the transition fillet of the journal and the oil passage on the journal shall be measured by sample comparison or other methods. 4.9 Dimensions
4.9.1 The diameter of the main journal and connecting rod journal shall be measured by a measuring tool with an accuracy of not less than ±0.004mm. 4.9.2 The angular deviation of the plane composed of the center plane of the gear keyway, the axis of each connecting rod journal and the axis of the main journal to the plane composed of the axis of the first connecting rod journal and the axis of the main journal 6
JB/T6727—2000
shall be measured on a zero-level flat plate with a standard V-shaped iron support and a height gauge, a fourth-level gauge, a lever micrometer or a digital micrometer.
4.10 Shape and position tolerance
The shape and position tolerance of each processed part on the crankshaft shall be inspected in accordance with GB/T1958. 4.11 Surface quality inspection
The surface quality of the crankshaft shall be observed with the naked eye.
4.12 The dynamic balance of the crankshaft shall be measured by a dynamic balancing machine, and the static balance shall be measured by a special device. 4.13 Magnetic particle inspection shall be carried out in accordance with the provisions of JB/T6729. 4.14 The fatigue test of the crankshaft shall be carried out in accordance with the product drawings or relevant technical documents. 4.15 Non-destructive testing can also be used for metallographic structure, hardness and internal defects of the crankshaft. 5 Inspection rules
5.1 Each crankshaft shall be inspected and qualified by the quality inspection department of the manufacturer before it can be shipped out of the factory. 5.2 The manufacturer shall conduct regular random inspections on the crankshafts, and the inspection items are 3.2~3.10. The inspection results shall meet the above requirements. 5.3 The period of regular random inspections shall be determined by the relevant departments of the manufacturer. 5.4 When the ordering unit randomly checks the crankshaft quality, the random inspection method shall be in accordance with the provisions of GB/T2828 or GB/2829, or determined by negotiation between the ordering unit and the manufacturer.
5.5 The manufacturer shall be responsible for conducting the tests of each random inspection, and the user shall re-inspect as needed. 6 Marking, packaging, transportation and storage
Crankshafts that have passed the inspection shall be marked with the manufacturer's factory logo or trademark. The location, size and method of marking shall be in accordance with the product drawings. 6.1
6.2Crankshafts that have passed the inspection shall be accompanied by a product quality certificate signed by the inspector. The certificate shall indicate:
a) manufacturer name and trademark;
b) internal combustion engine model, part name and part number; c) inspection date and inspector's signature;
d) implementation standard number.
6.3 The crankshaft must be cleaned and oil-sealed or treated with other anti-corrosion treatments before packaging to ensure that the parts are not damaged during normal transportation. The total mass of the box shall not exceed 50kg (this limit does not apply to single-piece packaging). 6.4 A packing list signed and stamped by the manufacturer's inspector and packer should be attached to the packaging box, and the internal combustion engine model, part name and quantity should be indicated on the list.
6.5 The outer surface of the packaging box should be marked with:
a) manufacturer's name, trademark and address;
b) internal combustion engine model and part name;
c) packing date, total mass and quantity;
d) words or logos such as "handle with care" and "moisture-proof". 6.6 The crankshaft should be stored in a ventilated and dry warehouse. Under normal storage conditions, the manufacturer should ensure that the crankshaft will not rust within 12 months from the date of leaving the factory.
A
1 Sampling location: Cut the journals radially from the main journal and connecting rod journal 4mm away from the crank arms at both ends. 4.5.2 Inspection method
4.5.2.1 Hardness method: According to the provisions of GB/T230, measure the surface hardness along the axial direction of the sample, and then use a vernier caliper to measure the size range of the specified hardness, which is the width of the hardened layer.
4.5.2.2 Corrosion method: Cut the above sample through the axis, then etch the cut surface with 3%~5% nitric acid alcohol solution, and measure the width of the hardened layer with a vernier caliper.
If there is any conflict between the measurement results of the above two methods, the hardness method shall prevail. 4.6 Depth of nitriding layer and surface hardness of nitrided crankshaft 4.6.1 Sampling location: Cut metallographic samples radially from the middle position of the journal or samples of the same treatment and heat. If there is any conflict between the two, the original sample shall prevail.
4.6.2 Inspection method
4.6.2.1 The depth of the nitride layer can be in accordance with the provisions of GB/T11354, or it can be corroded with 3%~5% nitric acid alcohol solution and then metallographically examined at 100 times or 200 times Measure under a microscope, or use thermal dyeing to measure the depth of the nitride layer under a 100x or 200x metallographic microscope. If there is any conflict between the three methods, the hardness method shall prevail.
4.6.2.2 Surface hardness is measured according to the provisions of GB/T4340.1. 4.7 Metallographic microstructure
4.7.1 Sampling location: Same as 4.6.1 or 4.6.2. 4.7.2 Test method: According to GB/T13320, GB/T9441, GB/T11354, JB/T9204, JB/T9205 and the provisions of Appendix A of this standard.
4.8 Surface roughness
4.8.1 The surface roughness of the main journal and connecting rod journal is measured with a surface roughness meter. Other methods are also allowed. -4.8.2 The surface roughness of the journal transition fillet and the oil passage opening of the journal is measured by sample comparison measurement or other methods. 4.9 Dimensions
4.9.1 The diameter of the main journal and connecting rod journal shall be measured with a measuring tool with an accuracy of not less than ±0.004mm. 4.9.2 The plane composed of the center surface of the gear keyway, the axis of each connecting rod journal and the axis of the main journal is composed of the axis of the first connecting rod journal and the axis of the main journal 6
JB/T6727—2000
The angular deviation of the plane should be measured with a standard V-shaped iron support on the zero-level flat plate, using a height ruler, fourth grade gauge, lever dial indicator or digital dry meter.
4.10 Shape and position tolerances
The shape and position tolerances of each machined part on the crankshaft shall be inspected in accordance with GB/T1958. 4.11 Surface quality inspection
The surface quality of the crankshaft should be observed with the naked eye.
4.12 The dynamic balance of the crankshaft is measured with a dynamic balancing machine, and the static balance is measured with a special device. 4.13 Magnetic particle inspection shall be carried out in accordance with the provisions of JB/T6729. 4.14 The crankshaft fatigue test shall be carried out in accordance with the product drawings or relevant technical documents. 4.15 Non-destructive testing can also be performed on the metallographic structure, hardness and internal defects of the crankshaft. 5 Inspection Rules
5.1 Each crankshaft must be inspected by the quality inspection department of the manufacturer before leaving the factory. 5.2 The manufacturer should conduct regular random inspections of crankshafts. The random inspection items are 3.2~3.10. The random inspection results should meet the above requirements. 5.3 The period of regular sampling inspection shall be determined by the relevant departments of the manufacturer. 5.4 When the ordering unit randomly inspects the quality of the crankshaft, the sampling inspection method shall be in accordance with the provisions of GB/T2828 or GB/2829, or shall be determined through consultation between the ordering unit and the manufacturer.
5.5 The manufacturer is responsible for conducting random inspections of various tests, and the user can re-test as needed. 6 Marking, packaging, transportation and storage
Crankshafts that have passed the inspection should be marked with the manufacturer's factory mark or trademark. The location, size and method of the mark shall be specified in the product drawing. 6.1
6.2 All crankshafts that pass the inspection shall be accompanied by a product quality certificate signed by the inspector. The certificate should be marked with:
a) Manufacturer’s name and trademark;
b) Internal combustion engine model, part name and part number; c) Inspection date and inspector’s signature; ||tt| |d) Execution standard number.
6.3 The crankshaft must be cleaned and oil-sealed or subjected to other anti-corrosion treatments before packaging to ensure that the parts will not be damaged during normal transportation. The total mass of the box shall not exceed 50kg (this restriction is not applicable when packaging in a single piece). 6.4 The packaging box should be accompanied by a packaging list signed by the manufacturer's inspector and packer. The internal combustion engine model, parts name and quantity should be indicated on the list.
6.5 The outer surface of the packaging box should be marked:
a) Manufacturer’s name, trademark and address;
b) Internal combustion engine model and part name;
c) Packing Date, total mass and quantity;
d) "Handle with care", "Moisture-proof" and other words or signs. 6.6 The crankshaft should be stored in a ventilated and dry warehouse. Under normal storage conditions, the manufacturer should ensure that the crankshaft will not rust within 12 months from the date of shipment.
A
2. Crankshafts that pass the inspection should be accompanied by a product quality certificate signed by the inspector. The certificate should be marked with:
a) Manufacturer’s name and trademark;
b) Internal combustion engine model, part name and part number; c) Inspection date and inspector’s signature; ||tt| |d) Execution standard number.
6.3 The crankshaft must be cleaned and oil-sealed or subjected to other anti-corrosion treatments before packaging to ensure that the parts will not be damaged during normal transportation. The total mass of the box shall not exceed 50kg (this restriction is not applicable when packaging in a single piece). 6.4 The packaging box should be accompanied by a packaging list signed by the manufacturer's inspector and packer. The internal combustion engine model, parts name and quantity should be indicated on the list.
6.5 The outer surface of the packaging box should be marked:
a) Manufacturer’s name, trademark and address;
b) Internal combustion engine model and part name;
c) Packing Date, total mass and quantity;
d) "Handle with care", "Moisture-proof" and other words or signs. 6.6 The crankshaft should be stored in a ventilated and dry warehouse. Under normal storage conditions, the manufacturer should ensure that the crankshaft will not rust within 12 months from the date of shipment.
A
2. Crankshafts that pass the inspection should be accompanied by a product quality certificate signed by the inspector. The certificate should be marked with:
a) Manufacturer’s name and trademark;
b) Internal combustion engine model, part name and part number; c) Inspection date and inspector’s signature; ||tt| |d) Execution standard number.
6.3 The crankshaft must be cleaned and oil-sealed or subjected to other anti-corrosion treatments before packaging to ensure that the parts will not be damaged during normal transportation. The total mass of the box shall not exceed 50kg (this restriction is not applicable when packaging in a single piece). 6.4 The packaging box should be accompanied by a packaging list signed by the manufacturer's inspector and packer. The internal combustion engine model, parts name and quantity should be indicated on the list.
6.5 The outer surface of the packaging box should be marked:
a) Manufacturer’s name, trademark and address;
b) Internal combustion engine model and part name;
c) Packing Date, total mass and quantity;
d) "Handle with care", "Moisture-proof" and other words or signs. 6.6 The crankshaft should be stored in a ventilated and dry warehouse. Under normal storage conditions, the manufacturer should ensure that the crankshaft will not rust within 12 months from the date of shipment.
A
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