This standard specifies the type and size of unified thread round die (hereinafter referred to as round die), technical requirements, performance test, marking and basic requirements for packaging. This standard is applicable to the processing of round die with 2A tolerance zone of unified thread (ANSIB 1.1-82). According to the needs of use, round die with 1A and 3A tolerance zone can also be produced. JB/T 8824.5-1998 Unified thread round die JB/T8824.5-1998 Standard download decompression password: www.bzxz.net

JC'S25.100.50
Standard of the Machinery Industry of the People's Republic of China
JB/T8824.5-1998
Circular screwing dies for unified threads1998-12-29 Issued
National Machinery Industry Bureau
1999-07-01 Implementation
J/T8824.51998
This standard is formulated in reference to the relevant parts of British Standard BS1127.1-1990 "Dies (Part 1) for use of circular dies and circular dies holders for machine tools". The rest of the standard is formulated in accordance with the technical provisions of GB 970.2-1994 for measuring dies. This standard was first issued on December 29, 1999. This standard is proposed and managed by the National Technical Committee for Standardization. The main drafting unit of this standard is Shanghai Cutting Tool Factory. 1 Scope
Standard of the Machinery Industry of the People's Republic of China
Cirenlar terewing die for unified thread
Cirenlar terewing die for unified thread JB/T8824.5—1998
This standard specifies the type and size, technical requirements, performance test, marking and basic requirements for packaging of unified thread dies (hereinafter referred to as drawing dies).
4 The standard is applicable to the dies for processing the 2A tolerance zone of unified thread (ANSI B1.1-82), and drawing dies for the 1A and 3A tolerance zones can also be produced according to the needs of use.
2 Applicable standards
The following standards contain clauses and articles, which are cited in this standard and become the clauses of this standard. When this standard is published, the versions shown are all valid. All standards will be customized. The points using this standard should be explored through the use of the latest version of the following standards. GB/T443--.1989L-AN Total Loss System Oil ANSIBI.1-B2 Standard - End Pattern www.bzxz.net
3 Type and Size
3.1 The type of the surrounding plate teeth is as required in Figure 1 and the dimensions are given in Table 2. HE
Guohao Machinery Industry Bureau approved 221m on 1998-12-29
1999-07-01 actual drag
relative code
No.1-64 UNC
No.2-16 UNC
No.3-48 UNC
No.-O UNC
No.5.40INC
No.6-32 UNC
No.8-12UNC
No.10-24 UNC
No.1224 NC
1/4-20UNG
5/16-1B UNL:
3B-16UNC
7/L6-14 UNC
1/213 LNC
9!16-12 INC
3/4-10LNC
78-9UNG
I-8 INC
1 NC
1-4 years oldLNC
2K-X UNC
2K -4 LNC
2%-4UNC
Every 25.4amm
Upper thread
Nominal diameter
JB/T8824.5—1998
Screw effect
Na.0RO1MF
No.1 UNP
No.2-64 UNF
No.3-56.UNF
No.4-48 LNE
No.S-4 UNF
No.6-40 UNF
No.836 UMF
No.10-32.UNF
No.12-28 LiNF
1/428LINF
5/16-24 LNF
3/8-24 UNF
16-20 UNF
12-2D LNF
9/I6-NF
5/8.18 UNF
3/4-16 UNF
7.8~-14.UNF
1-[2 UNF
1X-12 UNF
1-12UNF
1%-12 UNF
1X-12TANF
3,2 Marking Example
Number of upper teeth per 25.4ram
Nominal diameter
.3.505
12 700
JB/T 8B24.S—1998
unified thread, thread code 1/4-20NC, 20 teeth per 25.4mm, 1A tolerance zone general teeth: unified—thread circle die 1/4-20TNC-1AJB/8824.5.: 1998 fine thread unified thread, thread code 5/16-24UNF, 24 teeth per 25.4mm, 2A tolerance zone die unified—round die 5/16-24UNF-2AJB/8824.5—1998 code: unified round die seat after the code such as \1”, such as 3/8-16UNCL, the rest remains unchanged. 3
Technical requirements
4.1 Size
4.1.1 The position of the round teeth is given in Table 3. Nominal diameter*6.350~19.050JB/T8824.5-1998External drawingRadial runout of the drawing threadEnd face fixing tolerance of the shaft4.1.2The tolerance of the outer diameter D of the plate teeth is 0, and the tolerance of the thickness E is 124.2Material and iodine contentThe radial runout of the outer teeth before cutting4.Z.1The face plate teeth are made of 9SiCr alloy tools and W6Mo5Cr4V2 high-speed steel, as well as materials with equivalent properties to the above grades.
4.2.7 Hardness of the thread effect part of the round die:
WMp5Cr4Y2
4.3 Appearance and surface properties
360HRC
E2.822:361HR0
>2.822:362HRC
The surface of the die shall not have cracks, rust, or other defects that affect the performance. 4.3.1
The cutting edge of the round die shall be sharp, without burrs, scallops, or grinding burns. The upper limit values ​​of the surface roughness of the mesh die are listed in Table 4. Table 4 Nominal point diameter d External circle, thread fracture 5 Performance test 1.524-69.850 Each batch of round plate dies produced in batches shall be subjected to cutting performance sample test 5.1 Test conditions 5.1.1 Machine tool: Lathe that meets the speed requirements. 5.1.2 Tool: Sample size is 5 pieces. JB/T8824.5—1998 5.1.3 Test piece: Material is 45 steel, hardness is 170~200HB, pitch is greater than or equal to 2.54mm, the test piece shall be pre-cut with a depth of about 2/3 of the tooth quotient.
.1.4 Cutting specification: given in Table 5.
3.! .5 Cutting fluid: Use L-AN32 full loss system oil (according to GB/T443) or emulsified oil and water solution, the flow rate should not be less than sLmin
5.「.6 Tool clamping: The die is installed in the dynamic die chuck, and the end face plug of the round tooth is attached to the end face of the die chuck, s
Nominal diameter
6.350-9.525
>9.525~17.462
> 17.462-28.575
5.2 Evaluation of test results
Consistency of cutting
Total length of threads before cutting
5.2.1 Tool: The cutting teeth should not have any obvious wear and tear and should maintain the original performance. 5.2.2 The external threads cut by the round cutting teeth should meet the thread twist accuracy marked by the round teeth. When the pitch is less than or equal to 1.954mm, the thread surface roughness is R25μm, and when the pitch is greater than 1.954mm, R50umc5.2.3 After the round die test, each piece shall comply with the provisions of 5.2.1 and 5.2.2, otherwise the performance test of the batch of products shall be deemed unqualified. Marking and guarantee
(! The round die should be marked with
a) Manufacturing! or trademark of the distributor:
b) Screw code:
c) Tolerance band code (2A is allowed to be unmarked when the nominal diameter is 6.350mm) Material code (HSS is marked on the round die made of high-speed steel; no mark is made on the round die made of 9SiCr and other alloy tool pliers): e) The left-hand thread round die is marked with the letter "L\6.2 The packaging box should be marked with
) The name, address and trademark of the manufacturer or distributor: b) Round die mark;
Material code and material brand:
d) Number of pieces:
e) Year and month of manufacture.
6. 3 Packaging
The round die should be treated with rust prevention before packaging. The packaging must be firm and prevent damage during transportation.
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