Some standard content:
ICS65.060.10
T63
Machinery Industry Standard of the People's Republic of China
JB/T5615—2004
Replaces JB/T5615—1991
Tractor transmission gear| | tt | |tt||Normative reference documents
2
Terminology
3
4
Technical requirements
Inspection rules||tt| |5
6
mark,
packaging, transportation and storage
item
times
Appendix A (Informative Appendix) Gear Calculation method of the size of the starting point of the involute meshing of the gear pair. A.1 The radius of curvature p of the starting point of the involute meshing of the gear pair..A.2 The expansion angle of the starting point of the involute....
Appendix B (Informative Appendix) Tolerance Value of Center Distance of Gearbox Housing Hole Appendix C (Informative Appendix) Basis for Determining Gear Accuracy Level Figure 1 K-shaped diagram,
Table B.1 Center Distance of Gearbox Housing Hole Tolerance value, Table C.1 Correspondence between the accuracy grade of gear group I and IIII and the working linear speed.JB/T5615—2004
I
10
10|| tt||0
0
JB/T5615—2004
Foreword
This standard is a revision of JB/T5615-1991 "Technical Conditions for Tractor Transmission Gears". Compared with JB/T5615~1991, the main changes in this standard are as follows: - The description of "according to relevant standards" in 4.7.3 and 4.10.7 of the original standard is cancelled, and 4.7.4, 4.10.7.1 and 4.10 are added. 7.2 and other items, describe them in detail:
In the original standard 4.3...the metal flow direction should conform to the shape of the part....\, in 4.3 of this standard it is changed to...the metal flow direction It should tend towards the force direction of the part...\"Spline surface hardness:" in 4.10.6 of the original standard, changed to "Gear with spline chain," in 4.10.6 of this standard, 4.12 of the original standard .3 "Black structure at the tooth root circle:\" is changed to "Black structure at the tooth root circle" in 4.12.3 of this standard. This standard replaces JB/T5615-1991.
Appendix to this standard A. Appendix B and Appendix C are informative appendices. This standard is proposed by the China Machinery Industry Federation. This standard is drafted by the National Tractor Standardization Technical Committee. The main drafter of this standard is Chen Yikang. , Zhou Yu. The previous versions of the standards replaced by this standard are: ZBT63008-1988, JB/T5615-1991. 1 Scope
Tractor transmission gear technical conditions
JB/T5615--2004
This standard specifies the technical requirements, acceptance methods, inspection rules, marking, packaging, transportation and storage requirements for tractor transmission gears. This standard applies to involute cylindrical gears and circular dimensional gears of tractor transmission devices. It is also applicable to the corresponding gears of agricultural transport vehicles, combine receivers and similar engineering and forestry vehicle transmission devices. 2 Normative reference documents
The provisions in the following documents become provisions of this standard through reference in this standard . For dated reference documents, all subsequent amendments (excluding corrigenda) or revisions do not apply to this standard. However, parties that reach an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. Version. For undated referenced documents, the latest edition applies to this standard. GB/T275 Fitting of rolling bearings, shafts and housings GB/T1144 Dimensions, tolerances and inspections of rectangular splines (GB/T1144-2001, negISO14:1982) GB/T1357 Involute cylindrical gear modules (GB/T1357-1987, negISO54 : 1977) GB/T2828-1987 Batch-by-batch inspection and counting sampling procedures and sampling tables (applicable to inspection of consecutive batches) GB/T3478.1 Cylindrical straight tooth involute spline module standard tooth tolerance (GB/T3478.1 —1995, eqvISO41561981)
GB/T8539 General provisions for quality inspection of gear materials and heat treatment (GB/T8539~-2000, eqvISO6336-5:1996) GB/T10095.1~2 Involute cylindrical gears Accuracy (idtISO1328:1997) GB/T11365 Bevel gears and hypoid gears Accuracy 3 Terms
The following terms and definitions apply to this standard. 3.1
startpointofaction
The innermost point on the tooth seat that meshes with the mating gear. 3.2
The middle point of working tooth middle point of working tooth depth is the midpoint of the radial distance between the starting point of meshing on the tooth profile and the top of the tooth. 3.3
axial gear axialgear
Gear with shaft.
4 Technical Requirements
4.1 Gears shall comply with the requirements of this standard and be manufactured in accordance with the production crystal drawings and technical documents approved through prescribed procedures. 4.2 It is recommended that the gears be made of the following materials. Other grades of materials can also be used under the condition of ensuring strength and service life. 4.2.1 Carburizing (carbon-nitriding) steel: 20Mn2, 20Cr, 20CrMn, 20CrMo, 20CrMnTi, 20CrMnMo, 19CrNi5, 20CrNiMo, 25MnTiBRE and 30CrMnTi. 4.2.2 Quenched and tempered steel: 45, 40Cr, 40Mn, 45Cr, 45Mn2, 50Mn. 1
JB/T5615—2004
4.2.3 Low permeability steel: 55DTi, 60DTi. 4.2.4 Ductile iron: It is recommended to use rare magnesium molybdenum alloy ductile iron. Note: For gears with an accuracy of not less than level 8 and complex structures, requirements for transparency and non-metallic inclusions should be imposed on the steel. 4.3 Gear bristle:
Steel gear bristle should generally be made of silver or forged bristle. The metal flow direction should tend to the direction of stress of the part. The flow direction on the teeth is not allowed to be parallel to the tooth width direction. distributed.
4.4 Gear module:
The normal module of the cylindrical gear should comply with the provisions of GB/T1357 4.5 Gear accuracy level:
The accuracy level of the gear is determined by the gear designer or the host The factory determines based on usage requirements and manufacturing process conditions. In the absence of special requirements, Table C.1 in Appendix C can be used as the basis for determining the accuracy level of gear tolerance groups III and II. The accuracy level of the tolerance group can generally be the same as the accuracy level of tolerance groups II and IIII, or can be one level lower or higher than the accuracy level of tolerance groups IIII and IIII. The tolerances of IIII and III for low-speed and heavy-duty gears Some indicators in the group may be appropriately higher than the levels determined according to Table C.1. 4.6 Gear accuracy requirements:
4.6.1 Tolerances and limit deviations of gears
Manufacturing tolerances and limit deviations of cylindrical gears. It should be determined based on GB/T10095. In view of the gear waiting points and usage requirements within the scope of this standard, this standard also makes the following supplementary provisions. 4.6.1.1 It is recommended to use gear rate modification and modified gear tooth working surface tooth profile detection lines. Should be within the range of Figure 1 (K-shaped block diagram), tooth pre-
substitute
working tooth mid-center point
tons together as point
one-click gear accuracy The grade is higher and the value is one higher. Provisions of T10095, 4.6.1.3
The circular runout of the end face of the installed and positioned wheel hub should not be greater than the value specified in Table 1. Table 1
μm
Increased surface diameter of wheel Yi
mm
$50
>50~120
>120~250|| tt||6
27
30
33
7
33
36
40||tt| |Gear accuracy grade
9
40
44
50
Note:
When the accuracy levels of the three tolerance groups are different , determine the added surface circle runout value according to the highest accuracy level. 4.6.1.4
When the tooth term circle is not used as the measurement reference, its dimensional tolerance is ±! IT11 given. 4.6.1.5 The limit deviation ±F of the gearbox housing hole center distance is shown in Table 2. 2
50
54
60
Gear II Tolerance Group Accuracy Level| |tt||6
Table 2
7
8
JB/T5615--2004
9
m||tt ||mo
1
The shell hole center distance limit error is F
Note: When the accuracy levels of the three tolerance groups of the gears are different, and each gear pair in the gearbox When the accuracy levels are different, the limit deviation value shall be determined according to the highest accuracy level.
4.6.1.6 Parallelism tolerance between the center lines of the gearbox housing hole The parallelism tolerance F in the x direction is the projection of the two center lines of the housing hole on its reference plane (the plane passing through the ideal position of the two center lines) parallelism tolerance.
F.=1.25
Where
Tooth direction tolerance of the first gear, unit is um. The value is taken according to the highest accuracy level of the meshing gears between the two axes: Far
The number of gears on the axis between the bearing holes. When the axis spans are the same, n takes the larger one. 1
The parallelism tolerance F in the meaning direction is the parallelism tolerance projected by the two center lines of the shell hole on a plane that is perpendicular to its datum plane and parallel to the center line of the datum hole.
F=0.5F
The tolerance zone of parallelism between the center lines of the shell holes is a square prism with a normal cross-section size of F, ×F,. (2)
When it is inconvenient to specify the above tolerance values ??using the square prism tolerance zone in design, processing or inspection, the diameter F can be used. The cylindrical tolerance zone replaces the square prism tolerance zone.
F.=0.85 F.....
4.6.1.7 The manufacturing tolerance and limit deviation of bevel gears shall be in accordance with GB/T11365. 4.6.2 Testing of gear accuracy
(3)
4.6.2.1 The accuracy testing items of cylindrical gears should be in accordance with the provisions of GB/T10095. The accuracy of the installation and positioning datum of finished gears should also be used as an accuracy testing item. The end face runout of the finished gear hub that is not used for installation and positioning does not need to be checked. 4.6.2.2 When using a double-sided meshing instrument to comprehensively inspect gears, in order to fully reveal the gear rate error, the inspection meshing angle and the cutting gear meshing angle must differ by an angle Aα, the unit is rad
0
Medium:
&
22
Number of indexing worm heads for gear cutting machine tools:
Number of indexing worm gear teeth for gear cutting machine tools.
22
(4)
If limited to existing equipment, when the meshing angle must be equal to the meshing angle of the cutting teeth, the comprehensive radial tolerance of one tooth in the group IIII tolerance zone of the gear "Right" should be multiplied by 0.8.
4.6.2.3 When inspecting the tooth form error, the curvature radius or expansion angle of the involute starting point shall be calculated according to Appendix A. The inspection items and inspection methods for the accuracy of the bevel gear shall be according to GB/T11365 4.6.2.4 | , can be tested according to the requirements of the product drawing, 4.7 Accuracy level and accuracy requirements of splines
4.7.1 The accuracy level of involute splines should not be lower than level 6 JB specified in GB/T3478.1 /T5615—2004
4.7.27. The accuracy of the rectangular splines of grade 8 and 9 gears is in accordance with the general dimensional tolerance zone in GB/T1144: the accuracy of the rectangular splines of grade 6 gears is in accordance with the dimensional tolerance zone for precision transmission.
4.7.3 The dimensions, tolerance fit, shape and position tolerances, inspection items and inspection methods of the gears shall comply with the provisions of GB/T1144 or GB/T3478.1
4.7. The relevant accuracy requirements for the splines on the 4-axis gear should also comply with the above regulations. 4.8 Surface roughness
4.8.1 The surface roughness parameter value of the gear should not be greater than the value specified in Table 3, Table 3||tt| |jm
No. IIII tolerance group accuracy level
6
8
9
Note,
4.8.2||tt| |Tooth working surface surface roughness R,
0.8
1.6
2.0
3.2
Tooth root fillet surface roughness R||tt| |3.2
3.2
6.3
The surface roughness R of the tooth surface of the gear pair should not be greater than 6.3um. See Table 4.
Table 4
Spline type
True spline
Involute spline
Key tooth position||tt| |Small diameter
Large diameter
Key example
Small diameter
Large diameter
Key example
Tooth two-angle surface roughness R,| |tt||6.3
6.3
6.3
6.3
Express enzyme roughness R,
1.6
6.3||tt| |3.2
6.3
6.3
3.2
μm
4.8.3 Accuracy, shape and position tolerance and surface roughness parameters of the mating surface of rolling bearings The value is in accordance with the provisions of GB/T275: the surface roughness R of the mating surface with the oil seal seal lip should not be greater than 0.8um. 4.9 Effective hardened layer depth of gear tooth surface
4.9.1 The nominal value of the effective hardened layer depth of carburized (carbonitriding) steel gear tooth surface, in the absence of special requirements, should be in Table 5 Select within the range and add the tolerance value. Table 5
Gear module m
>1.0~2.0
>2.0~3.5
>3.5~4.5
>4.5~5.5||tt ||>5.5~6.5
>6.5~8.0
>8.0-9.5
>9.5 ~-11.0
Nominal value range of effective hardened layer depth||tt| |0.400.55
0.550.70
0.70~-0.90
0.90~1.10
1.10~1.30
1.301.50
1.50~1,70
1.70~1.90
Note: For bevel gears, the normal module of the midpoint is the same as below. 4
Tolerance value
±0.13
±0.14
±0.15
±0.16
±0.17
± 0.18
±0.19
±0.20
mm
The effective hardened layer depth of the internal gear tooth surface can be reduced according to Table 6. When using the carbonitriding process, the effective hardening The layer depth can be reduced according to Table 6. JB/T5615—2004
When using 25MnTiBRE, 30CrMnTi and other carburizing steels with higher carbon content, the effective hardened layer depth can be reduced according to Table 6. For heavy-duty driving gears, the effective hardened layer depth should be increased according to Table 6. Table 6
Gear module M
Reduction value
3.5
3.55.0
>5.0
4.9.2|| tt||≤0.10
≤0.15
≤0.25
Adjustment value of effective hardened layer depth
The hardened layer depth and measurement location of gears made of quenched and tempered steel and low permeability steel are shown in Table 7 and Table 8. Table 7
Measurement location
The gear tooth normal section in the middle of the tooth width
Measurement location and method
Tooth bottom radial direction
Steel type
Quenched and tempered steel
Low itching permeability steel
Use Vickers hardness method in Under a teaching load of 9.8N, measure from the surface to 0.8 times the lower limit of the specified surface hardness. Note: m is the gear module
4.10 surface hardness
Table 8
Steel type
Quenched and tempered steel
Gear module m
≤5.0
>5.0
≤5.0
>5.0
Low front permeability steel
Added value
≥0.07
≥0.12
≥0.20
mm
mm
Effective hardened layer depth
1.0~2.5
1.5~3.0
1.0~2.2
1.5~2.8
mm
Effective hardened layer Depth
(0.17~0.24)m
(0.15~0.20)m
4.10.1 The tooth surface hardness of carburizing (carbonitriding) steel gears should be It is 56HRC~64HRC. For heavy-duty gears, the hardness difference of a single gear between 59HRC~64HRC should not be greater than 3HRC. The tooth surface hardness of the internal ring gear: if the module is less than 5, it should not be less than 50HRC, if the module is equal to or greater than 5, it should not be less than 45HRC, and the hardness difference of a single gear should not be more than 4HRC. 4.10.2 The tooth surface of quenched and tempered steel gears should generally be hardened. The tooth surface hardness should not be less than 50HRC. The tooth surface hardness without surface hardening should not be less than 255HBS. The surface hardness difference of a single gear should not be greater than 4HRC(25HBS). 4.10.3 The tooth surface hardness of low-permeability steel gears should not be higher than 56HRC, and the hardness difference of a single gear should not be greater than 4HRC. 4.10.4 The tooth surface hardness of ductile iron gears should be 42HRC~46HRC. 4.10.5 For driven gears with a tooth ratio of not less than 3, the tooth surface hardness can be 3HRC~5HRC lower than the tooth surface hardness of the meshing driving gear. The specific reduction value is determined by the designer and noted on the drawing. 4.10.6 For gears with splines, the surface hardness of the splines within the gear should not be less than 50HRC. For gears that are induction heated after carburization, the hardness of the spline working surface should be above 35HRC while ensuring surface strength and wear resistance. 5
JB/T5615-2004
4.10.7 Hardness of the external spline surface of the shaft gear and the matching surface with the bearing and oil seal lip 4.10.7.1 Quenched and tempered steel shaft gear, surface rate The fire hardness should not be less than 50HRC, the overall fire hardness should not be less than 45HRC, and the surface hardness difference within a single piece should not be greater than 4HRC.
4.10.7.2 The surface hardness of carburized (carbonitriding) steel shaft gears should be 56HRC~64HRC, and the surface hardness difference within a single piece should not be greater than 3HRC.
The surface hardness of the thin-walled hollow shaft gear mounting bearing part (the ratio of wall thickness to matching diameter is less than 1:5) should not be less than 35HRC. 4.10.8
The core hardness of carburized (carbonitriding) steel gears should comply with the provisions of Table 9, 4.11
Table 9
20Cr
Modulus m
3.5
3.55.0
>5.0
Note: *Not declared to use this combination
20Mn2
30 ~42
28~40
20CrMo
20CrMn
31~44
3042
2840
20CrMnMo|| tt||20CrNiMo
20CrMnT
19CrNi5
25MnTiBRe
32~46
31~44
30~42||tt| |The measurement location of the core hardness should be on the normal section in the middle of the tooth width, where the gear tooth center line intersects with the tooth root
4.12
4.12.1||tt| |4.12.2
Martensite is not greater than level 5.
For other metallographic structure requirements, see Table 10
Table 10
World wheel modulus m
≤3.5
3.55.0
>5.0
Carburizing
Sliding gear
Surface free carbide
Fixed gear
Carbo-nitriding
1~5 level
level 1~5
level 1~5
level 1~5
level 1~5
level 1~5||tt| |Carburizing
Level 1~5
Level 1~6
Level 16
Carburizing
Level 1~5||tt ||Level 1~5
Level 1~-5
Carburizing
HRC
30CrMnTi
3548
33~46| |tt||Central ferrite
Carbono-nitriding
Level 1~4
Level 1~4
Level 1~5||tt| |Level 1~4
Level 1~4
Level 1~5
4.12.3 Black tissue at the root circle is not allowed when the sample has not been inspected for corrosion. Black belt; the depth of black spots and black mesh should not be greater than 0.02mm: after the sample is lightly corroded, the width of the black mesh should not be greater than 0.04mm. Gears with a black mesh width greater than 0.04mm to 0.06mm and slight black bands (within 0.01mm) can be used as qualified products after the tooth roots are strengthened and shot peened. 4.13 Gear heat treatment quality inspection methods
In addition to the hard layer inspection locations and methods specified in Table 8 in 4.9.2, the heat treatment quality inspection of gears should comply with the relevant regulations of GB/T8539.
4.14 Surface condition of gears
There should be no oxide scale, cracks, marks, cracks, metal delamination and debris on the crystal surface of gears. 4.15 Gear Appearance Quality
4.15.1 If the gear product drawing does not indicate that chamfering is allowed at the tip of the tooth, it shall not be chamfered. 4.15.2
6
The tooth root shall not be chamfered There are visible dug roots.
2. The tooth surface of quenched and tempered steel gears should generally be hardened. The tooth surface hardness should not be less than 50HRC. The tooth surface hardness without surface hardening should not be less than 255HBS. The surface hardness difference of a single gear should not be greater than 4HRC ( 25HBS). 4.10.3 The tooth surface hardness of low-permeability steel gears should not be higher than 56HRC, and the hardness difference of a single gear should not be greater than 4HRC. 4.10.4 The tooth surface hardness of ductile iron gears should be 42HRC~46HRC. 4.10.5 For driven gears with a tooth ratio of not less than 3, the tooth surface hardness can be 3HRC~5HRC lower than the tooth surface hardness of the meshing driving gear. The specific reduction value is determined by the designer and noted on the drawing. 4.10.6 For gears with splines, the surface hardness of the splines within the gear should not be less than 50HRC. For gears that are induction heated after carburization, the hardness of the spline working surface should be above 35HRC while ensuring surface strength and wear resistance. 5
JB/T5615-2004
4.10.7 Hardness of the external spline surface of the shaft gear and the matching surface with the bearing and oil seal lip 4.10.7.1 Quenched and tempered steel shaft gear, surface rate The fire hardness should not be less than 50HRC, the overall fire hardness should not be less than 45HRC, and the surface hardness difference within a single piece should not be greater than 4HRC.
4.10.7.2 The surface hardness of carburized (carbonitriding) steel shaft gears should be 56HRC~64HRC, and the surface hardness difference within a single piece should not be greater than 3HRC.
The surface hardness of the thin-walled hollow shaft gear mounting bearing part (the ratio of wall thickness to matching diameter is less than 1:5) should not be less than 35HRC. 4.10.8
The core hardness of carburized (carbonitriding) steel gears should comply with the requirements of Table 9, 4.11
Table 9
20Cr
Modulus m
3.5
3.55.0
>5.0
Note: *Not declared to use this combination
20Mn2
30 ~42
28~40
20CrMo
20CrMn
31~44
3042
2840
20CrMnMo|| tt||20CrNiMo
20CrMnT
19CrNi5
25MnTiBRe
32~46
31~44
30~42||tt| |The measurement location of the core hardness should be on the normal section in the middle of the tooth width, where the tooth center line intersects with the tooth root.
4.12
4.12.1||tt| |4.12.2
Martensite is not greater than level 5.
For other metallographic structure requirements, see Table 10
Table 10
World wheel modulus m
≤3.5
3.55.0
>5.0
Carburizing
Sliding gear
Surface free carbide
Fixed gear
Carbo-nitriding
1~5 level
level 1~5
level 1~5
level 1~5
level 1~5
level 1~5||tt| |Carburizing
Level 1~5
Level 1~6
Level 16
Carburizing
Level 1~5||tt ||Level 1~5
Level 1~-5
Carburizingbzxz.net
HRC
30CrMnTi
3548
33~46| |tt||Central ferrite
Carbono-nitriding
Level 1~4
Level 1~4
Level 1~5||tt| |Level 1~4
Level 1~4
Level 1~5
4.12.3 Black tissue at the root circle is not allowed when the sample has not been inspected for corrosion. Black belt; the depth of black spots and black mesh should not be greater than 0.02mm: after the sample is lightly corroded, the width of the black mesh should not be greater than 0.04mm. Gears with a black mesh width greater than 0.04mm to 0.06mm and slight black bands (within 0.01mm) can be used as qualified products after the tooth roots are strengthened and shot peened. 4.13 Gear heat treatment quality inspection methods
In addition to the hard layer inspection locations and methods specified in Table 8 in 4.9.2, the heat treatment quality inspection of gears should comply with the relevant regulations of GB/T8539.
4.14 Surface condition of gears
There should be no oxide scale, cracks, marks, cracks, metal delamination and debris on the crystal surface of gears. 4.15 Gear Appearance Quality
4.15.1 If the gear product drawing does not indicate that chamfering is allowed at the top of the tooth, it shall not be chamfered. 4.15.2
6
The tooth root shall not be chamfered There are visible dug roots.
2 The tooth surface of quenched and tempered steel gears should generally be hardened, and the tooth surface hardness should not be less than 50HRC. The tooth surface hardness of gears without surface hardening should not be less than 255HBS. The surface hardness difference of single-piece gears should not be greater than 4HRC (25HBS). 4.10.3 The tooth surface hardness of low-permeability steel gears should not be higher than 56HRC, and the hardness difference of single-piece gears should not be greater than 4HRC. 4.10.4 The tooth surface hardness of ductile iron gears should be 42HRC~46HRC. 4.10.5 The tooth surface hardness of driven gears with a tooth ratio of not less than 3 can be 3HRC~5HRC lower than the tooth surface hardness of the meshing driving gear. The specific reduction value shall be determined by the designer and indicated on the drawing. 4.10.6 For gears with splines, the surface hardness of the splines inside the gears shall not be less than 50HRC. For gears that are induction heated after carburizing, the spline working surface hardness should be above 35HRC under the condition of ensuring surface strength and wear resistance. 5
JB/T5615-2004
4.10.7 Hardness of the external spline surface of the shaft gear and the surface matching with the bearing and oil seal lip 4.10.7.1 The surface hardness of the quenched and tempered steel shaft gear shall not be less than 50HRC, the overall hardness shall not be less than 45HRC, and the surface hardness difference within a single piece shall not be greater than 4HRC.
4.10.7.2 The surface hardness of the carburized (carbonitrided) steel shaft gear shall be 56HRC~64HRC, and the surface hardness difference within a single piece shall not be greater than 3HRC.
The surface hardness of the thin-walled hollow shaft gear where the bearing is installed (the ratio of wall thickness to matching diameter is less than 1:5) shall not be less than 35HRC. 4.10.8
Carburizing (carbonitriding) steel gear core hardness shall comply with the requirements of Table 9. 4.11
Table 9
20Cr
Gear module m
3.5
3.55.0
>5.0
Note: *This combination is not recommended
20Mn2
30~42
28~40
20CrMo
20CrMn
31~44
3042||tt ||2840
20CrMnMo
20CrNiMo
20CrMnT
19CrNi5
25MnTiBRe
32~46
31~44
30~42
The measurement position of the core hardness should be on the normal section in the middle of the tooth width. The metallographic structure of the tooth at the intersection of the center line of the tooth and the tooth root
4.12
4.12.1
4.12.2
The martensite shall not be greater than level 5.
Other metallographic structure requirements are shown in Table 10
Table 10
Modulus of gear m
≤3.5
3.55.0
>5.0
Carburizing
Sliding gear
Surface free carbide
Fixed gear
Carbon-nitriding
Grade 1~5
Grade 1~5
Grade 1~5
Grade 1~5
Carburizing
Grade 1~5
Grade 1~6
Grade 16
Carbon-nitriding
1~ Level 5
Level 1~5
Level 1~-5
Carburizing
HRC
30CrMnTi
3548
33~46
Core ferrite
Carbon-nitrogen co-carburizing
Level 1~4
Level 1~4
Level 1~5
Level 1~4
Level 1~4
Level 1~5
4.12.3 For the black structure at the root circle of the tooth, when the sample has not been inspected for corrosion, no black belt is allowed; the depth of black spots and black nets should not be greater than 0.02mm: after the sample is lightly corroded, the width of the black net should not be greater than 0.04mm. Gears with a black mesh width greater than 0.04mm to 0.06mm and slight black bands (within 0.01mm) can be used as qualified products after strengthening shot peening on the tooth root. 4.13 Gear heat treatment quality inspection method
Except for the hard layer inspection locations and methods specified in Table 8 in 4.9.2, the heat treatment quality inspection of gears shall comply with the relevant provisions of GB/T8539.
4.14 Surface condition of gears
There should be no oxide scale, cracks, scars, cracks, metal stratification and debris on the crystallized surface of the gear. 4.15 Gear appearance quality
4.15.1 Gears that do not indicate that chamfering of the tooth top is allowed in the product drawing shall not be chamfered. 4.15.2
6
There should be no visible root digging at the tooth root.
0
Carburizing
Sliding gear
Surface free carbide
Fixed gear
Carbo-nitride
Level 1~5
Level 1~5
Level 1~5
Level 1~5
Level 1~5
Level 1~5
Carburizing
Level 1~5
Level 1~6
Level 16
Carburizing
Level 1~5||tt| |Grade 1~5
Grade 1~-5
Carburizing
HRC
30CrMnTi
3548
33~46|| tt||Central ferrite
Carbo-nitrogen co-infiltration
Level 1~4||Level 1~4
Level 1~5
Level 1~4
Level 1~4
Level 1~5
4.12.3 For black structures at the root circle, black is not allowed when the sample has not been inspected for corrosion Band; the depth of black spots and black mesh should not be greater than 0.02mm: after the sample is lightly corroded, the width of the black mesh should not be greater than 0.04mm. Gears with a black mesh width greater than 0.04mm to 0.06mm and slight black bands (within 0.01mm) can be used as qualified products after the tooth roots are strengthened and shot peened. 4.13 Gear heat treatment quality inspection methods
In addition to the hard layer inspection locations and methods specified in Table 8 in 4.9.2, the heat treatment quality inspection of gears should comply with the relevant regulations of GB/T8539.
4.14 Surface condition of gears
There should be no oxide scale, cracks, marks, cracks, metal delamination and debris on the crystal surface of gears. 4.15 Gear Appearance Quality
4.15.1 If the gear product drawing does not indicate that chamfering is allowed at the tip of the tooth, it shall not be chamfered. 4.15.2
6
The tooth root shall not be chamfered There are visible dug roots.
0
Carburizing
Sliding gear
Free carbides on the surface
Fixed gear
Carbo-nitride
Level 1~5
Level 1~5
Level 1~5
Level 1~5
Level 1~5
Level 1~5
Carburizing
Level 1~5
Level 1~6
Level 16
Carburizing
Level 1~5||tt| |Grade 1~5
Grade 1~-5
Carburizing
HRC
30CrMnTi
3548
33~46|| tt||Central ferrite
Carbo-nitrogen co-infiltration
Level 1~4||Level 1~4
Level 1~5
Level 1~4
Level 1~4
Level 1~5
4.12.3 For black structures at the root circle, black is not allowed when the sample has not been inspected for corrosion Band; the depth of black spots and black mesh should not be greater than 0.02mm: after the sample is lightly corroded, the width of the black mesh should not be greater than 0.04mm. Gears with a black mesh width greater than 0.04mm to 0.06mm and slight black bands (within 0.01mm) can be used as qualified products after the tooth roots are strengthened and shot peened. 4.13 Gear heat treatment quality inspection methods
In addition to the hard layer inspection locations and methods specified in Table 8 in 4.9.2, the heat treatment quality inspection of gears should comply with the relevant regulations of GB/T8539.
4.14 Surface condition of gears
There should be no oxide scale, cracks, marks, cracks, metal delamination and debris on the crystal surface of gears. 4.15 Gear Appearance Quality
4.15.1 If the gear product drawing does not indicate that chamfering is allowed at the top of the tooth, it shall not be chamfered. 4.15.2
6
The tooth root shall not be chamfered There are visible dug roots.
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