JB/T 9179.3-1999 JB/T 9179.3-1999 Machining allowances and tolerances of free forgings on hydraulic presses Step shafts JB/T9179.3-1999 Standard download decompression password: www.bzxz.net

JB/T9179.3
This standard is a revision of ZBJ32003.3-88 "Machining allowance and tolerance of step shafts for free forgings on hydraulic presses". During the revision, editorial changes were made to the original text, and the main technical contents were modified as follows: - The additional allowance is determined by the tonnage of the hydraulic press. This standard replaces ZBJ32003.3-·-88 from the date of implementation. Appendix A, Appendix B, and Appendix C of this standard are all appendices to the standard. This standard is proposed and managed by the National Technical Committee for Forging Standardization. The responsible drafting unit of this standard: Shanghai Heavy Machinery Factory. The main drafters of this standard: Wang Qianhe and Xie Peide. 364
Machinery Industry Standard of the People's Republic of China
Machining allowances and tolerances of open die forgingson hydraulic press--Stepped shaft
Machining allowances and tolerances of open die forgingson hydraulic press--Stepped shaft This standard specifies the allowances and tolerances of open die forgingson hydraulic press--Stepped shaft. This standard is applicable to open die forgings with round, square and rectangular cross-sections. 2 Referenced standards
JB/T9179.3---1999
Replaces ZBJ32003.3--88
The provisions 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 are subject to revision, and parties using this standard should explore the possibility of using the latest versions of the following standards. JB/T9179.2-1999 Machining allowance and tolerance of free forgings on hydraulic press 3 allowances and tolerances for round shafts, square shafts and rectangular sections
The machining allowance and tolerance of free forgings such as step shafts shall comply with Figure 1, Table 1 and the provisions of JB/T9179.2. (1~1. 5)a =+ bzxz.net
(1~1. 5)a
(1~~1. 5)a
(1~1. 5)u
(1~1. 5)a
Approved by the National Machinery Industry Bureau on 1999-06-24 (1~1.5)a
(1~1. 5)α
( 1~1. 5)a
L_ (1~1. 5)a
(1~1. 5)α
(1 ~1. 5)
(1~1. 5)a
2000-01~01Implementation
On the true diameter
Additional allowance
Selection of forging equipment
Difference in cross-section diameter
8 000~16 000 kN
25 000~31 500 kN
60 000~~120 000 kN
4General provisions
JB/T 9179.3—1999
56|112180250|315|400|450500560630|710|800mm
1 000 1 200
to 【56112180250|315400|450|500560|630|710|800|900|1000120013003
4.1 According to the total length of the shaft and the basic size of the largest cross section, select the allowance according to JB/T9179.2 as the basic allowance for all diameters (cross sections) of the shaft.
4.2 According to the difference between the largest adjacent diameters (cross sections) of the shaft, select the additional allowance according to Table 1 and add the additional allowance to the basic allowance. The basic allowance plus the additional allowance is the allowance of the shaft. The limit deviation is 1/3 of the allowance. 4.3 The minimum height and minimum depth of the steps and recesses of the forgings shall be in accordance with the provisions of Appendix A (Appendix to the standard). 4.4 The minimum length of the steps and recesses of the forgings shall be in accordance with the provisions of Appendix B (Appendix to the standard). 4.5 The minimum length of forged flange shall be in accordance with the provisions of Appendix C (Standard Appendix). 4.6 Application example: D = 450mm; L, = 200mm; D, = 200 mm; lz = 2 200 mm;
Ds==500mm; L3150mm;
Total length L = 2550mm. Using a 25000kN hydraulic press, it is found that the basic allowance is 34mm and the additional allowance is 11mm, so the allowance and limit deviation are 45mm ± 15mm; the basic size of the forging is obtained: D. =450+45=495mm limit deviation ±15mm;
Lu-200+45X2.5=312.5mm (take 315mm) limit deviation ±38mm;
Dza-200+45-245 mm
limit deviation ±15mm;
L2 -2 200-45X2. 5=2 087. 5 mm (take 2 090 mm) limit deviation ±38mm;
Dao500+45=545mm
limit deviation ±15mm;
L3n=150+45X2.5==262.5 mm (take 265mm) limit deviation ±38mm;
Total length L2550-45×2.5=2662.5mm (take 2665mm) limit deviation ±38 mm.
JB/T 9179.3--1999
Appendix A
(Appendix of standard push)
Minimum height and minimum depth of the step and recess that can be forged on the step shaft The minimum height and minimum depth of the step and recess that can be forged on the step shaft shall comply with the provisions of Figure A1 and Table A1. A1
Forging length
Diameter adjacent to the step (Dz, D, D),) 200|270335|400|470535|600670|750|835900
1 000/1 100
to 200|270|335400|470535600|667075083590010001100
Minimum step height that can be forged (h
10002000
4 000|6 000
60008000
8 000 10 000
1000012000
12 000|14 000
14 00016 000
1600018000
18000/20000
17【19
According to the diameter Dz or D. of the adjacent concave block, check the minimum forging depth of the concave block. 33
Measurement depth of the block (h2,)
350|1450
450:16001900
When the length of the bad material number stamp before the concave block is forged is equal to or greater than the width of the hydraulic press anvil, the concave block must be forged. When the length of the bad material number stamp before the concave block is forged is less than 2
the width of the hydraulic press, it is allowed to enlarge the concave block diameter so that the length of the bad material after the number stamp is equal to the width of the anvil. 367
JB/T9179.3—-1999
Appendix B
(Appendix to the standard)
The minimum length of the step and recess that can be forged on a stepped shaftThe minimum length of the step and recess that can be forged on a stepped shaft shall comply with the requirements of Figure A1 in Appendix A and Table B1 of this Appendix. Table B1
Diameter adjacent to step (DD, D)
Forging length
200270335400470535600|670750|835900
1110012001350/1450
to200270|335400470535600670|750835900|10001100Minimum step length that can be forged for end step (L1, 20001
20004000
4 000 /6 0007
6 000 |8 000
8 000j10 000
1000012000
12 000/14 000
14 00016 000
16 000/18 000
18 00020 000 | | tt | |tt||390|430470
15901630
1350390|430470510550590
163 0167017101 | | tt | | 1390430 | 1710
710750790
17501790840
550590/630670/7101750/790 840920630670|710750790840|920980
When the step height h is less than 40mm, the value in the table can be increased by 255%. 2 The minimum length of the middle step that can be forged is 50% of the table value. 590
20013501145016001900
, Lr) or concave gear length ()
104011100
10401100
1 1601 220
When the length of the material number stamp before the concave gear is forged is equal to or greater than the width of the hydraulic press anvil, the concave gear must be forged: When the length of the broken material number stamp before the concave gear is forged is less than 3
the width of the hydraulic press anvil, it is allowed to enlarge the concave gear diameter so that the length of the broken material after the number stamp is equal to the anvil width. Application example: Determine whether the middle concave block of the stepped shaft in Figure B1 is forged. B2
First check the allowance and find that the depth of the middle concave block is 125mm and the length is 150mm. Then check Table A1 in Appendix A and Table B1 in Appendix B and find that the depth of the concave block is 37mm and the length is 630mm. Although the depth of the concave block is greater than the value in the table, the length is less than the value in the table, so the concave block of the stepped shaft does not need to be forged, and the stepped shaft should be forged according to the forging diagram in Figure B2. i
(1000)
475±40175
425±40
(350)
(300)
2575±40
(2450)
(300)
(500)
(1000)| |tt||1075±40
(950)
2575±40
(2450)
Figure 132
(500)
JB/T 9179.3—1999
Appendix C
(Standard Appendix)
Minimum length of flange forgings with flange C1 The minimum length of flange forgings with flange shall comply with the provisions of Figure C1 and Table C1. Figure C1
Part shaft diameter
Intermediate flange diameter D
Greater than/100200|300400500|600700800|900100011001200|130014001500|16001
7001 800/1 9002 000
to 200300400500|600700800|9001000110012001130014001500160017001800|190020002100Minimum forging length L of intermediate flange
16001700
1800|1900
60/100130
10140180200240
100/120/160/190|220
0170200
70100130160
80110140
100130
Note: The end flange shall be increased by 50% according to the values ​​listed in the table. 2603—1999
Appendix C
(Standard Appendix)
Minimum length of flange forgings with flange C1 The minimum length of flange forgings with flange shall comply with the provisions of Figure C1 and Table C1. Figure C1
Part shaft diameter
Intermediate flange diameter D
Greater than/100200|300400500|600700800|900100011001200|130014001500|16001
7001 800/1 9002 000
to 200300400500|600700800|9001000110012001130014001500160017001800|190020002100Minimum forging length L of intermediate flange
16001700
1800|1900
60/100130
10140180200240
100/120/160/190|220
0170200
70100130160
80110140
100130
Note: The end flange shall be increased by 50% according to the values ​​listed in the table. 2603—1999
Appendix C
(Standard Appendix)
Minimum length of flange forgings with flange C1 The minimum length of flange forgings with flange shall comply with the provisions of Figure C1 and Table C1. Figure C1
Part shaft diameter
Intermediate flange diameter D
Greater than/100200|300400500|600700800|900100011001200|130014001500|16001
7001 800/1 9002 000
to 200300400500|600700800|9001000110012001130014001500160017001800|190020002100Minimum forging length L of intermediate flange
16001700
1800|1900
60/100130
10140180200240
100/120/160/190|220
0170200
70100130160
80110140
100130
Note: The end flange shall be increased by 50% according to the values ​​listed in the table. 260
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