Some standard content:
Mechanical Industry Standard of the People's Republic of China
JB/T50190-1999
Gear Hob
Life Test Method and Acceptance Conditions
(Internal Use)
1999-06-09 Issued
National Machinery Industry Bureau
20-04)-01-01 Implementation
JBT50190-1999bzxz.net
This standard is a revision of ZBJ4101089 (Gear Hob Life Test Method and Acceptance Conditions). This standard is consistent with the technical content of ZBJ410-B9, and has only been re-edited in accordance with relevant regulations. This standard replaces ZBJ41010-9 from the date of implementation. Appendix A of this standard is Appendix of the reminder.
This standard is proposed and managed by the National Technical Inspection Committee for Standardization of Tools. The responsible drafting unit of this standard: Chengdu Tool Research Institute. The main drafters of this standard: Shang Hongqi, Shen Tu:) Scope
Machinery Industry Standard of the People's Republic of China
Gear Hob
Life Test Method and Acceptance Conditions
(Internal Use)
[B/T50190—1999
Generation 2B 41 CIC S
This standard specifies the type, size and technical requirements of the hob used for life test, test equipment, cutting fluid, cutting specifications, size and other criteria and acceptance conditions.
This standard is applicable to the comparative test and acceptance of high-speed steel step wheel hobs with non-strength and non-reinforced modular treatment by model and manufacturer.
2 Cited standards
The texts contained in the following standards constitute the provisions of this standard through reference in this standard: When this standard is published, the versions shown are valid. All standards may be revised. All parties using this standard should explore the possibility of using the latest versions of the following standards: GH/231.—1484
GHT307J—1988
GB760831985
GB/T6084—1985
G:T8064—1987
GB-T 10095——1988
3 Tools
Metal Bullet Hardness Test Method
Technical Conditions for Alloy Diamond Steel
Basic Type and Size of Gear Hob
Technical Conditions for Gear Hob Cutting
Gear Hob Cutting Machine Accuracy
New Cutting Line Cylindrical Disc Accuracy
31 Type, Dimension and Technical Requirements of Cutting Tools
The type, size and technical requirements of the cutting edges used in the test shall comply with the provisions of GB/T6083 and GB/T6084: 3.2 Type of Cutting Tools
The front angle of the cutting tool used in the test shall be 0°, and the back angle shall be in accordance with the provisions of GB/T60-1985 Appendix. Test belt rolling gear tooth morphology photos.
3.3 Tool regrinding
In principle, only the new diameter should be used for the test. If the influence of tool grinding is to be studied, the diameter after regrinding should not be reduced by 10%. In this case, the actual diameter should be indicated for such tests. 3.4 Tool materials and surface treatment
The polyester material used for the test should comply with the provisions of G/T4. The main chemical composition of the rolling door material, the hardness of the cutter and the density of the cutter should be checked, and metallographic micrographs should be taken [the magnification ratio is 100~50 times]. The inspection of the heat treatment phase structure should be placed at the diameter of the tooth: if the cutter is coated or surface elasticized, the test method of this standard should be referred to. Approved by the State Machinery Industry Bureau on June 9, 1999
Implementation on January 1, 2000
Cutting procedures and acceptance methods:
3.5 Sichuan installation
JE/T 50190--199g
The cutter should be installed on a tool rod that can meet the requirements of precision and rigidity. The hob should be clamped firmly and reliably. The installation accuracy requires that the limit movement of the two shafts and the end face of the drawer shall not exceed the requirements of the table. 1
Shaft ladder four-way
Fast development age
4 Test
4.1 Test material
>3.5·-6.3
The test material is 40Cr steel, its chemical composition and technical parameters are in accordance with the provisions of GB/T3077: the main elements are shown in Table 2. When preparing rolling test in batches, the steel mill should be asked to prepare stricter test materials: Table 2
0.50-4.80
Test material should not be light round steel: For the same group of tests, the test should use the material of the same furnace number 4.2 Heat treatment
D.BC-].10
The test control adopts quenching and tempering heat treatment process, and the typical pressure is 200~22011D. Only one rate of fire is allowed in the counterclockwise direction. The parameters of the quenching and tempering heat treatment 1. are recommended as follows!
Preheating temperature: 65-700
Preheating rate: 0.5min/mm
Heating width: 850-.860
Heating rate: 0.5min/mm
Cooling medium: 20%KNO, +20%NaNO+25%NaNO, +35%H2O Cooling method: 1.5-2s/After cold beating, put into oil to burn and tempering temperature: 730-735
[Fire protection time: 2-2.5]
This process is carried out in the salt solution
4.3 Test hardness test
4.3.1 Test the hardness after the test heat treatment According to the specification of GB/T23, the roughness of the hardness test table is R1.6m.2
JBrr50190-199y
4.3.2 Test the surface hardness. Measure 1 point on the test surface at 5 different radial positions in the test area, and mark the hardness value on the surface of the workpiece according to the average value. 4.3.3 Test the hardness test. The test hardness test is carried out on the half surface passing through the test axis. A row of hardness test is made along the axis. The hardness of the material to the point shall not be less than 10 points, and the distance between the points shall not be less than 6 points. The difference between the highest hardness and the lowest hardness of the test sample shall not exceed 151IB. The test sample shall be drawn out according to the furnace number of the material, and 1 piece shall be taken if it is not 100.
4.3.4 The metallographic microstructure, tensile strength and deformation of the test material should be observed under the relevant micro-environment (magnification 100~500 times) and the metallographic microstructure photos should be taken.
4.4 Or the specification of the test piece
The thickness of the test piece is 50mm, the hole diameter is 4-5mm, the outer diameter of the test piece is determined according to the test hob modulus and the actual outer diameter of the test piece, and the size tolerance and position tolerance of the test piece are in accordance with the provisions of (B100). The surface roughness of the inner hole, outer hole and both end faces of the test piece is 1.614.5 Installation of the test
The test piece should be placed on the rolling machine. The radial step effect of the two outer sides is not more than 5 0m. 5 Cutting fluid
During the cutting test, the cutting fluid should be fully cooled with a slurry of oil. The cutting fluid used should not have a trademark or solution composition. The cutting fluid should be injected into the cutting agent part of the roller. The flow rate should be greater than 81.mi. The temperature of the variable speed, flow and salt wave box should be recorded. 6 Test equipment
6.! Cooling machine
The machine tool used for the test is a vertical gear hobbing machine, and its specifications should comply with the specifications of GB No. 64. The gear hobbing machine has sufficient uniformity and good rigidity. The power required during the test should generally not exceed 70% of the rated power of the machine. The test load should not exceed 75% of the load of the hobbing machine tool holder slide. The feed motion should be normal under load. Abnormal vibration and other abnormal phenomena should not occur during the test. 6.2 Test equipment
The test equipment required for the test is listed in Table 3
Test items
Inch tolerance
Table Surface torsion
Metallographic wire drawing!
Size change
Surface roughness
External pitting
Metallographic structure
Cutting conditions
Avoid giving the flag
Spindle rotation
Tree deep shop
Force tool micro-change
Some countries face change machine trend
Data processing
Cutting agent conditions
7.1. The method of rate measurement specified in the technical standard is reverse milling JE/T 50190—1999. The required measuring instruments are vernier caliper, ten-point gauge, dynamic inspection, inspection spindle, force gauge frame, surface roughness comparison sample, (surface roughness chain seat inspection instrument), metallographic matching mirror, vernier lower caliper, ten-point gauge, torque comparator, dynamic control deflection instrument, silver force inspection instrument, pneumatic vision instrument, milling force inspection instrument, the most important tool is microscope, tooth thickness limit card, good inspection shaft, blue force gauge frame, surface roughness inspection instrument, 10 times magnification, hardness tester, metallographic number acceptance, the most commercial, weighing table
Tachometer
Normal caliper
1. Microscope
Shanxi quick adjustment of large pins, its reputation
Roughness comparison sample (surface roughness tester: calculation process
7.2 In order to make the test results comparable, the tool modulus is divided into sections, and representative specifications are taken from each section for testing. If it is difficult to take representative specifications, specifications close to them can be taken:
7.2.1 The promotion value and division number of the representative specifications shall be in accordance with the provisions of Table 4 and 7.2.2 and 2.3. Cutting 4
Deep force modulus
Representative format
Initial cutting speed v
1 piece per revolution feed!
JB/T50190-1995
7.2.2 The module of the commercial cutter is m%3.5mm, one cut to the full tooth depth; it needs to be >3.5mm and two cuts to the full tooth depth, the first cut to 75% of the full depth7.2.2 The allowable range of cutting speed is V±2%V: the allowable feed rate per revolution of the workpiece is f+2.5%f8. The wear criterion of the cutter is
After the customer hob, the wear limit of the tooth top circle should be measured in the direction perpendicular to the cutting edge. O
The wear width VB is the distance from the original cutting edge to the limit position of the wear increase. 8.2 The front edge of the hob evenly cut edge CH
The evenly cut edge of the insert should be on the back and front of the tool, parallel or perpendicular to the upward measuring disc of the original cutting. If necessary, the position of the fan edge on the cutting edge should also be indicated.
S.3 Surface roughness of the test piece tooth surface R
The surface roughness of the tooth surface is measured by a surface roughness comparison sample. When there is a dispute, the surface roughness inspection instrument is used to measure the surface and the result of the instrument test shall prevail:
8.4 During the test, when one of the above life standards exceeds the limit value, the test should be stopped. The limit values of various life criteria are according to Table 5.
Mold loss effect
>6 1-10
Surface report VE
When other phenomena that cannot be stopped during normal cutting occur during the test, the test should be stopped. 4 Test steps
Test piece tooth surface roughness R
9.1 The hob sample should be numbered, tested, and recorded. Hobs with defects that affect performance should not be used. 9.2 Check the composition, metallographic structure, hardness, size and tolerance of the test piece, and make records: 9.3 Check the test hobbing machine, check the certificate of conformity, recheck the main precision performance parameters, and make records. 9.4 The test hobs and test sequence for the test are randomly selected: JB/T50190—1999
95 Check the no-load motion parameters and load motion of the hobbing machine, and make records: 9. Clean the tool holder and tool rod. When the tool is installed on the tool holder and tightened, use a T-type dial with a graduation value of 0.001mm to measure the axial runout and end face runout of the shaft table and make a record. When the test piece is installed on the workbench and tightened, use a down-gauge with a graduation value of 0.001mm to measure the axial runout of the test piece and make a record. After finishing a set of test cutting, the cutter shall return to the starting point. When withdrawing the cutter, check if the cutter has not touched the test cutter. 9. The test cutter shall not release axial force. For each set of test cutting, all the cutter teeth involved in the cutting shall be checked. Then the left and right cutting edges with the most severe damage shall be measured respectively. Before terminating the test, at least 5 measurements shall be taken to determine the wear position of the hob. The wear curve of the hob shall be drawn (coordinates: wear value B, horizontal semi-circular: cutting length L). After the cutter is measured, it shall be installed on the tool holder. The radial runout of the hob shaft and the runout between the end faces shall be re-checked. 9.8 Requirements for recording the test results shall be written in a very unified format [see Appendix A (see Appendix for details) 1. Any abnormal situation during the test shall be recorded; and the shape of the cutter at the end of the test shall be recorded. 9.9 If necessary, a preliminary test should be conducted.
9.10 During the test, if an operating error occurs, the machine tool itself moves suddenly or other abnormal reasons cause the test to be terminated, the test error should be eliminated and the test should be repeated. 10 Acceptance conditions
This standard adopts a rapid test acceptance method with a reduced number of samples. This method is proposed under the condition of following the Weibull distribution law. The Weibull slope is specified as: 5-2.$b_=2 for the first-class product. 10. Acceptance basis
The acceptance basis specified in this standard is the average life of the printing body, and its life value is specified in Table 6. Table 6
Beam training number
>3.5 -6.3
Life value () calculation method
or in:
Hob life,:
N-number of cut test diameters;
B-test damage sensitivity, mm;
Number of teeth:
K——number of cutting times.
1D.2 Inspection method
10.2.1 Inspection method
Z=NBzR/1000
Average life
J8T50190-1599
This standard specifies the acceptance method. When the cutting length L of each inspection sample is compared with the specified cutting point L, the body represented by the qualified sample is accepted: otherwise, the parent body is accepted. Or the average life of the batch exceeds the average life specified in step 6. The confidence level of the report is 95%. 10.2.2 Acceptance criteria The acceptance of the life of the hob is based on the cut-off point of the service life. The specified value is shown in Table 7. During acceptance, each test sample must be large enough to meet the requirements of the regulations to pass. Concentrated mold particles -2- 5: 3.5 -5.3 Number of test samples The life point is excellent and the price is one-tenth of the standard JB/T 50150-19992 Check the composition, metallographic structure, hardness, size and tolerance of the test gear, and make a record: 9.3 Check the test gear hobbing machine, check the certificate of the instrument, re-check the main precision performance parameters, and make a record. 9.4 The test gears used for the test are randomly selected: the micro test hobs and the test sequence are also randomly determined: JB/T50190-1999
95 Check the no-load motion parameters and load motion parameters of the hobbing machine, and make a record: 9. Clean the tool holder and tool bar. When the tool is installed on the tool holder and tightened, use the T-meter with a separation value of 0.001mm to measure the horizontal runout and end face runout of the shaft table, and make a record; when the test gear is installed on the workbench and tightened, use the lower meter with a division value of 0.001mm to measure the horizontal runout of the test gear, and make a record. After finishing a set of test cutting, the cutter shall return to the starting point. When withdrawing the cutter, check if the cutter has not touched the test cutter. 9. The test cutter shall not release axial force. For each set of test cutting, all the cutter teeth involved in the cutting shall be checked. Then the left and right cutting edges with the most severe damage shall be measured respectively. Before terminating the test, at least 5 measurements shall be taken to determine the wear position of the hob. The wear curve of the hob shall be drawn (coordinates: wear value B, horizontal semi-circular: cutting length L). After the cutter is measured, it shall be installed on the tool holder. The radial runout of the hob shaft and the runout between the end faces shall be re-checked. 9.8 Requirements for recording the test results shall be written in a very unified format [see Appendix A (see Appendix for details) 1. Any abnormal situation during the test shall be recorded; and the shape of the cutter at the end of the test shall be recorded. 9.9 If necessary, a preliminary test should be conducted.
9.10 During the test, if an operating error occurs, the machine tool itself moves suddenly or other abnormal reasons cause the test to be terminated, the test error should be eliminated and the test should be repeated. 10 Acceptance conditions
This standard adopts a rapid test acceptance method with a reduced number of samples. This method is proposed under the condition of following the Weibull distribution law. The Weibull slope is specified as: 5-2.$b_=2 for the first-class product. 10. Acceptance basis
The acceptance basis specified in this standard is the average life of the printing body, and its life value is specified in Table 6. Table 6
Beam training number
>3.5 -6.3
Life value () calculation method
or in:
Hob life,:
N-number of cut test diameters;
B-test damage sensitivity, mm;
Number of teeth:
K——number of cutting times.
1D.2 Inspection method
10.2.1 Inspection method
Z=NBzR/1000
Average life
J8T50190-1599
This standard specifies the acceptance method. When the cutting length L of each inspection sample is compared with the specified cutting point L, the body represented by the qualified sample is accepted: otherwise, the parent body is accepted. Or the average life of the batch exceeds the average life specified in step 6. The confidence level of the report is 95%. 10.2.2 Acceptance criteria The acceptance of the life of the hob is based on the cut-off point of the service life. The specified value is shown in Table 7. During acceptance, each test sample must be large enough to meet the requirements of the regulations to pass. Concentrated mold particles -2- 5: 3.5 -5.3 Number of test samples The life point is excellent and the price is one-tenth of the standard JB/T 50150-19992 Check the composition, metallographic structure, hardness, size and tolerance of the test gear, and make a record: 9.3 Check the test gear hobbing machine, check the certificate of the instrument, re-check the main precision performance parameters, and make a record. 9.4 The test gears used for the test are randomly selected: the micro test hobs and the test sequence are also randomly determined: JB/T50190-1999
95 Check the no-load motion parameters and load motion parameters of the hobbing machine, and make a record: 9. Clean the tool holder and tool bar. When the tool is installed on the tool holder and tightened, use the T-meter with a separation value of 0.001mm to measure the horizontal runout and end face runout of the shaft table, and make a record; when the test gear is installed on the workbench and tightened, use the lower meter with a division value of 0.001mm to measure the horizontal runout of the test gear, and make a record. After finishing a set of test cutting, the cutter shall return to the starting point. When withdrawing the cutter, check if the cutter has not touched the test cutter. 9. The test cutter shall not release axial force. For each set of test cutting, all the cutter teeth involved in the cutting shall be checked. Then the left and right cutting edges with the most severe damage shall be measured respectively. Before terminating the test, at least 5 measurements shall be taken to determine the wear position of the hob. The wear curve of the hob shall be drawn (coordinates: wear value B, horizontal semi-circular: cutting length L). After the cutter is measured, it shall be installed on the tool holder. The radial runout of the hob shaft and the runout between the end faces shall be re-checked. 9.8 Requirements for recording the test results shall be written in a very unified format [see Appendix A (see Appendix for details) 1. Any abnormal situation during the test shall be recorded; and the shape of the cutter at the end of the test shall be recorded. 9.9 If necessary, a preliminary test should be conducted.
9.10 During the test, if an operating error occurs, the machine tool itself moves suddenly or other abnormal reasons cause the test to be terminated, the test error should be eliminated and the test should be repeated. 10 Acceptance conditions
This standard adopts a rapid test acceptance method with a reduced number of samples. This method is proposed under the condition of following the Weibull distribution law. The Weibull slope is specified as: 5-2.$b_=2 for the first-class product. 10. Acceptance basis
The acceptance basis specified in this standard is the average life of the printing body, and its life value is specified in Table 6. Table 6
Beam training number
>3.5 -6.3
Life value () calculation method
or in:
Hob life,:
N-number of cut test diameters;
B-test damage sensitivity, mm;
Number of teeth:
K——number of cutting times.
1D.2 Inspection method
10.2.1 Inspection method
Z=NBzR/1000
Average life
J8T50190-1599
This standard specifies the acceptance method. When the cutting length L of each inspection sample is compared with the specified cutting point L, the body represented by the qualified sample is accepted: otherwise, the parent body is accepted. Or the average life of the batch exceeds the average life specified in step 6. The confidence level of the report is 95%. 10.2.2 Acceptance criteria The acceptance of the life of the hob is based on the cut-off point of the service life. The specified value is shown in Table 7. During acceptance, each test sample must be large enough to meet the requirements of the regulations to pass. Concentrated mold particles -2- 5: 3.5 -5.3 Number of test samples The life point is excellent and the price is one-tenth of the standard JB/T 50150-1999
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