JB/T 8825.6-1998 This standard specifies the basic requirements for the type and size, technical requirements and marking and packaging of Whitworth thread rolling plates. This standard applies to the rolling plates for processing Whitworth threads (BS 84-1956). The rolling plates are divided into two accuracy levels: Grade 2 and Grade 3. Grade 2 is suitable for processing medium-grade external threads, and Grade 3 is suitable for processing free-grade external threads. This standard was first issued on December 29, 1998. JB/T 8825.6-1998 Whitworth thread rolling plates JB/T8825.6-1998 standard download decompression password: www.bzxz.net

TCS 25.400.50
Machinery Industry Standard of the People's Republic of China
JB/T 8825.6—1998
Thread rolting flat dies for whitworth threads1998-12-29 Issued
National Bureau of Machinery Industry
1999-07-01 Implementation
JE8825.61998
This standard was first issued on December 29, 199.
This standard was proposed and managed by the National Standardization Technology Committee. The main drafting units of this standard are: Shanghai Standard Parts Tool Factory and Shanghai Cutting Tool Factory. Standard of the People's Republic of China on Mechanical Industry
Thrcad roling tatdles for whitworth threads
Thrcad roling tatdles for whitworth threads1B/T8825.6-1998
This standard defines the basic requirements for the type and size, technical requirements, marking, and packaging of Whitworth thread rolling tatdles (hereinafter referred to as thread rolling tatdles).
This standard is applicable to thread rolling tatdles for processing Whitworth threads (BS84-1956). Thread rolling tatdles are divided into two grades of accuracy: grade 2 and grade 3. Grade 2 is suitable for processing medium-grade external threads, and grade 3 is suitable for processing white-grade external threads. 3 Referenced standards
The provisions contained in the following standards become the provisions of this standard by reference in this standard. When this standard is published, the versions shown are all revised. All standards will be revised. Parties using this standard should explore the possibility of using the latest versions of the following standards. Since S84-1956 Whitworth thread type and size, the type of wire cabinet is shown in Figure 1, and the size is given in Table 1, Table 2, and Table 3. 3.1 Actual product Active board Fixed thread board Note: The installation angle of the explosion-proof thread selection board with T.4gmm can also be made into 90*. National Machinery Industry Council approved on December 29, 1998
Implementation on July 1, 1999
JB/T825.6—1998
H(examination)
Avoid using shade
1/8~3/16
1/8-1-4
1/4~3/8
51169116
Explosive construction code
1.8.40 55W
3/16-24BSW
1/420BSW
WL6-1B BSW
3/8-16RSW
7/16-14BSW
-12BSW
9/16-12BS
S/R-IBSW
1t/16-11R8W
3/4-10B5W
1s BSW
each: 25.4mm
upper tooth
nominal diameter
JB/T B825.6—1998
Table 1 (end)
pitch P
sweat: a, w,
lower and are recommended dimensions.
Screw code
3/16-32BSF
7/32-28BSF
14-26R8F
9/3226BSF
Post 25.4mm
Upper tooth
International self-diameter company
H (Spring Examination)
4°46°
1-30°
Applicable scope
3r4--1
Yiwen code
516-22BS
3/820B5F
7/16-18 BF
L/2-16BSF
9-16-16RSF
1/8-14BSF
Hri614 BSF
3/412B5F
7/8-11BSF
I-10BSF
Nominal point diameter
25.4mm
Number of upper teeth
JB8825.6--1998
Table 3()
Note: ,,, K, and nut are recommended sizes.
2°5Gr
2°1sr
3.2 The thread profile dimensions and deviations of the thread rolling plate are given in Figure 2 and Table 4. A-type thread is preferred. A-type
A, B-type
Upper thread profile
Lower deviation
JB/T8824.6-1998
Upper standard
Lower deviationWww.bzxZ.net
Note: The maximum radius R of the tooth is 0.137°, and its range of variation depends on the actual measurement. 3.3 Marking example
Every 25.4mm
Screw deviation
2, 3 system
± 45'
± 40°
coarse Whitworth thread, burning thread code is 1/4-2088W, 20 teeth per 25.4mm, gram degree 5Vmm, fixed thread rolling test length 150MTP, 3 sugar degree, burst thread change A: Whitworth thread set plate
A1/4-20BSW50/150.3JB/T8825.6199 fine Whitworth thread, bad thread code is 1 /2-16BSF, 16 teeth per 25.4mm, width 60mm, length of the circumferential thread rolling plate 230mm, grade 3 accuracy, slow number of teeth type A: Whitworth screw thread board A1/2-16BSF60/230-3JB/T8825.6-19984 Technical US ticket
4.1 Dimensions
4.1.1 The deviation of dimensions Z and B is h14. The difference in width between the fixed thread plate and the movable thread delivery plate in a pair of thread rolling plates should not exceed 0.1mm. 4.12 The change line perpendicular to the half surface of the thread rolling plate support surface and the tooth plane, the parallelism tolerance of the support surface, the width force direction is given in the change 5, and the length direction is given in Table 6.
Nominal blood diameter of processed thread
> 2.845~5.556
> 5.556-11.112
>.112-22.225
Length of thread changing plate
>80-120
>120--180
>150-250
>250-315
>315m400
JB 8825.6 --199
Flow rate of thread detection plate
> 50-80
Parallelism tolerance
Annual tolerance
"When checking the parallelism of the plate teeth to the support, the direction of the wire drawing plate is equal to the length of the wire drawing plate. The pressure of the part of the wire drawing plate that is equal to the length of the wire drawing plate is not included.
4.1.3 The vertical tolerance of the support surface of the wire drawing plate: 0.02mm for thickness H30mm; 0.03mm for thickness H>30mm. 4.1.4 The lifting angle of the wire drawing plate is ±2° for 2 and ±3° for 3.1 The lifting angle of a pair of wire drawing plates is 3 for level 2 and 4 for level 3.
4. 2 Materials and hardness
4.2.1 The thread rolling plate is made of Cr12MoY or 9SiCr alloy tool steel. The uniformity of carbide of Cr12MoY is not more than level 3. 4.7.2 The hardness of the thread-operating part is 59-62HRC, and there should be no decarburization on the working surface: 4.3 External gauge and surface roughness
4.3.1 The surface of the thread rolling plate shall not have defects such as cracks, rust, and rate cutting burns that affect the performance. 6
JH/T88256—1998
4.3.2 The upper limit of the surface roughness of the thread rolling plate shall be in accordance with the following provisions: Mosquito tooth surface
Support surface, installation surface
5 Marking and packaging
5. 1) The thread rolling plate should be marked with
) manufacturer or distributor's trademark;
processing end thread number:
c) thread rolling plate thread tooth type;
d) accuracy grade:
e) thread rolling plate width;
manufacturing material.
5.2 The packaging box should be marked with
3) manufacturer or distributor's name, address and trademark: b) thread rolling plate mark;
c) manufacturing material:
d) manufacturing year and month.
5.3 Packaging || tt || The wire plate should be treated with rust prevention before packaging. The packaging must be firm and prevent damage during transportation.
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