JB/T 8825.5-1998 The type and size of this standard are formulated with reference to the relevant parts of the British Standard BS 1127.1-1990 "Dies (Part 1) Hand and Machine Circular Dies and Die Holders". The rest of the standard is formulated with reference to the Chinese national standard GB/T 970.2-1994 "Technical Conditions for Circular Dies". This standard specifies the basic requirements for the type and size, technical requirements, performance tests, marking and packaging of Whitworth thread circular dies. This standard is applicable to circular dies for processing Whitworth threads with thread codes of 1/8 to 2 3/4. This standard was first issued on December 29, 1998. JB/T 8825.5-1998 Whitworth Thread Circular Dies JB/T8825.5-1998 Standard download decompression password: www.bzxz.net

JCS 25.100.50
Machinery Industry Standard of the People's Republic of China
JB/T8825.5-1998
Circular screwing dies for whitworth threads
Circular screwing dies for whitworth threads1998-12-29 Issued
National Bureau of Machinery Industry
1999-07-01 Implementation
8815.5-1998
This standard is formulated in accordance with the relevant parts of British Standard BS1127.1-1990 "Dies (First Postal Division) for use and circular dies and die holders for machines". The rest of the standard is formulated in accordance with GB/T970.2-1994 (Technical conditions for circular dies). This standard was first issued on December 29, 1998. This standard is issued and managed by the National Technical Committee for Tool Standardization. This standard was drafted by: Shanghai Cutting Tool Factory 1 Scope
China Machinery Industry Standard
Whitworth Thread Round Dies
Clrcubargcrewtng diesforwbitnorththreadsJB/T8825.5—1998
This standard specifies the types and sizes, technical requirements, performance test marks and packaging of Whitworth thread round dies (hereinafter referred to as "dips").
This standard is applicable to round dies for processing screw threads with the code 18-2. 2 Reference Standards
The provisions contained in the following standards constitute the provisions of this standard by being referenced in this standard. When this standard is revised, the versions shown are valid. All standards will be revised, and each party using this standard should explore the possibility of using the latest version of the following standards. GB.T443--1989
3 Types and dimensions
L-AN Total loss oil system
3.1 The round die type is as shown in Figure 1, and the dimensions are as shown in Tables 1 and 2. a
0~1fmm
D-2uam
China Machinery Industry Exhibition 1998-13-79 Approved
1999-0 7-01 Actual tons
Exhaust code
1/8-40BSW
3.16-24BSW
1/4-20BSW
5116-18W
3WR-16BSW
7/16-14BSW
i2-12Bsw
9/16-12 BSW
5/8-BS
1/16-1EBSW
314-10BSW

Frequency twisted generation guide
3/1632BSF
/32-28BSF
1/4-26 BSF
9/32-26BSF
5/1622 BST
per 25.demns
nominal diameter
......
number of upper teeth
public diameter
JB/T8815.5—199B
frequency effect code
3.820 BSF
7/16-18BF
12-16 HSF
9/16-16RSF
5/-14 BSF
1]/16-[4BSF
3/4-12 B5F
7/B-11BSF
1-10 BSF
1%-9 BSF
%-9BSF
1%-8 BSF
IX -R BSF
1%-7BSF
2-7BSF
2Y6 BSF
2-6 BSF
2-6BSF
3.2 Marking example
Number of teeth per 25.4mm
Nominal diameter
JB/T825.5--1998
Table (complete)
Same tooth Whitworth auxiliary, thread code is 1/4-20BSW, there are 20 teeth per 25.4mm, medium dial die Gao Shi explosive effect tooth 1:4-20BW-2 day T8825.5-1998 fine pitch Gao Shi exhaust thread, thread code is 5/16-24BSP, every 25.4mm is 24 teeth, free-grade die Whitworth thread drawing die 5/16-24B$F-3 Hall 8825.5-1998 Note: Whitworth to thread round die should add \I” to the code, add 3/8-16BSWL, the rest remains unchanged, 4 Technical requirements
4,1.1 The position tolerance of round die is given in Table 3. m
Nominal diameter
6.350-19.050
JB/I8825.5—1998
For external use, the tolerance of the outer diameter D of the four-die is 0, and the tolerance of the thickness E is 12. 4.2 Material and hardness
For external use, the tolerance of the cutting edge is round
4.1.1 The mesh die is made of 95ICt alloy steel or W6M5Cr4V2 high-strength steel, as well as materials with equivalent properties to the above grades.
4.2.2 Hardness of the thread effect part of the round die: not less than 60HRC when using 95iCr, not less than 62HRC when using W6Mo5C4V2, 4.3 External gauge and surface roughness
4.3.1 The surface of the round die shall not have cracks, teeth, rust and other defects that affect the performance. The cutting edge of the round die shall be sharp, without burrs, broken teeth and grinding burns. 4.3.2
The upper limit of the surface roughness of the round die is given in Table 4. 4.3.3
Outer circle, sheath surface
Thread surfacewww.bzxz.net
Performance test blue
Nominal diameter d
3.175-69.850
The batch production of round die mother batches shall be subjected to the average performance sampling test. 5.1 Test conditions
5.1.1 Machine tool: a machine tool that meets the test requirements. 5.1.2 Tool: The sample size is 5 pieces.
Surface roughness
5.t.3 Test piece: The material is 43 steel, and the hardness is 170-200HB. When the pitch is greater than or equal to 25.4mm, the test piece should be pre-cut into a thread shape with a probe height of about 2.3 teeth.
5.1.4 Cutting range: given in Table 5.
1.5 Pre-filter: Use L-AN32 full-consumption system oil (according to GBT443) and high-efficiency emulsified oil water bath plating, and its flow rate should not be less than sL/min.
5.1.6 Cutting tool clamping: The round die is installed in the floating die chuck, and the end face of the die is close to the end face of the floating die chuck 1.4
Nominal diameter 4
26.350-9.525
>9.525~17.462
>17,462-28.575
5.2 Evaluation of test results
Japanese Standard 25.5-1998
5.2.1 The die should not have fan blades and obvious signs, and maintain the original performance. Total length of thread effect before cutting
5.2.2 Workpiece: The external thread diameter cut by the round die shall conform to the thread precision increase marked by the round die. When the pitch is less than or equal to 1.814 mm, the thread surface roughness R is 25 μm. When the pitch is greater than 1.814 mm, R is 50 μm. 5.2.3 After the test, each piece of the threaded die shall conform to the provisions of 5.2.1 and 5.3.2, otherwise the performance test of the batch of products shall be judged to be unqualified. 6 Marking and packaging
6.1 The die should be marked
a) manufacturer or sales trademark:
b) thread code:
c) thread effect code [when the nominal diameter d<6.350mm, level 3 is not allowed to be marked)) material code (die made of high-speed period is marked with HSS, and ring die made of alloy tool steel such as 9SiCr can be unmarked); left-hand thread round die is marked with the letter "".
6.2) The packaging box should be marked with the name, address and trademark of the manufacturer and salesperson: b) Round plate tooth mark: c) Material code or material brand: d) Number of pieces: e) Year and month of production. 6.3 Packaging Round cabinet teeth should be treated with anti-rust treatment before packaging. The packaging must be firm and can prevent damage during transportation. 5
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