This standard specifies the type and size, technical requirements, performance test and marking, and basic requirements for packaging of 60° tapered pipe thread round dies. This standard applies to round dies for machining 60° tapered pipe threads (NPT) with thread size codes of 1/16 to 2. JB/T 8364.1-1996 60° tapered pipe thread round dies JB/T8364.1-1996 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T 8364.1-96
60° Taper Pipe Thread Round Die
1996-04-22 Issued
Ministry of Machinery Industry of the People's Republic of China
1996-07-01 Implementation
JB/T 834. 196
Appendix A of this standard is the appendix of the standard.
This standard is proposed by the National Technical Committee for Tool Standardization. The responsible drafting units of this standard are Shangzhun Cutting Tool Factory, Jizhou Tool General, Gandu Tool Research Institute, and the main drafters are Shun Yuzhui, Zhang Hongyi, Jiang Tizhi, and Qianjin. This standard was first issued on April 22, 1996. This standard will be implemented from July 1, 1996. ScopewwW.bzxz.Net
Machinery Industry Standard of the People's Republic of China
and 3B/T6364.196
The standard specifies the type and size, technical requirements, performance test and marking, and packaging cost requirements of 60mm round pipe thread dies. This standard is applicable to 60mm round pipe thread dies with normal size code of 1/16~3mm NPT>. Reference Standards
The texts contained in the following standards constitute the provisions of this standard by being cited in this standard. When the standard is published, the version shown is valid. All standards will be revised, and the parties using this standard should consider the possibility of using the latest version of the following standards. GB/T443-8SL-AN Total Loss System Oil 3 Types and Sizes
31 The types and sizes of the panel loss shall be in accordance with the provisions of 1 and Table 1. E
Note: The non-standard panel teeth shall be specified by the previous party. Figure 1 Panel teeth type and size are smaller
Ministry of Machinery Industry 1996-04-22 approved
1996-07-01 implemented
Domestic tooth teaching
JB/T8364.1-96
National small tooth
At least complete
13 959
14-757
Foundation Engineering
ground height
Note: The most public tooth recording degree, reference surface industry reference section light 4, instrument for the accompanying requirements, the design ratio should be based on the tooth ratio diagram, 3.2 Marking example
60° thread chain reputation frequency pattern, code NP71/4 round plate tooth: 50 stroke taper tube screw plate tooth NFT1JB/R34.19660° mesh reputation period pattern, code NFT1/4, in the threaded plate element S0\round dimension arm screw effect round plate tooth NPT1/1-LJBT364.1-16
4 Technical requirements
4.1 The surface of the plate shall not have defects such as cracks, period edges, recovery marks and grinding scratches that affect the performance. 4.2 The upper limit of the surface roughness of the steel plate is as follows: external surface, end surface
screw surface
front and back of the cutting edge R, G.3um.
4.3 The dimensional tolerance of the outer diameter D of the instantaneous die shall be 19. The thickness E shall be in accordance with 19124.4 The position tolerances of various parts of the mesh die shall be in accordance with the provisions of Table 2. The position tolerances of various belts of the round die in Table 2 are 1/6~·3/4.
3 The light-weight and light-weight dies are light-weight and light-weight.
For the new medical use, the oblique medical jump head
4.5 The die shall be made of 5iC: alloy tool steel or W6M05C4V2 high-speed pins and materials with the same or higher performance as the above grades.
4.6 The hardness of the fourth die thread effect part made of DSiCr shall not be less than 6nHRC. The hardness of the entire outer surface of the die made of WGMnSC4V2 shall not be less than G2T1RC.
Performance test
JB/T 8364.1-96
For batch-produced round dies, each batch shall be subjected to a cutting performance drag test. 5.1 Test conditions
5.1.1 Machine tools: lathes that meet the requirements of precision, 5.1.2 Cutting tools: the minimum sample size is 5 pieces.
5.1.3 Test damage: the material is 45 pin, the hardness is 170~200HB: the test piece shall be pre-processed and cut? : 16 chain-shaped test piece, 5.1.4 Cutting specification is in accordance with the provisions of Table 3, 5.1.5 Cutting fluid: use 120 emulsion water according to the calibration or use L-AV enterprise consumption table (G/T443) of oil), the flow rate should not be lower than 5L/mitla
Table 3 Pre-cutting range
1/16--1/2
3/4--2
5.2 Evaluation of test results
1. 3~1. 7
1. 7--2. 0
Effective parts teaching
After the test, the round plate teeth should not have the phenomenon of edge and obvious wear, and maintain the original service life. The more accurate the cut test piece is, the more accurate it should be. The maximum allowable value of the whole is 25Am. If there is 1 unqualified piece, the die will be deemed unqualified.
6 Marking and packaging
6. 1. 1 Die, should be marked with:
) Manufacturer's trademark
h) Screw code:
) Material code (die made of high-speed is marked with IISS, die made of 9SICr and other alloy tools may not be marked) 6. 1, 2 The following items should be marked on the packaging box: a) Manufacturer name, trademark address b) National standard marking items: c) Material brand or code: d) Number of pieces: Year and month of manufacture, 6.2 Packaging The board should be treated with anti-silver before packaging. The packaging must be firm and can withstand damage during transportation. 3 Basic dimensions JB/T 8364.1-96
Appendix A
Basic dimensions and elemental deviations of cone screws (Appendix to the standard)
The basic dimensions and elemental deviations of cone screws with a single thread are smaller than the original dimensions. See Table A1 and Table A1
Required deviations
The basic dimensions of cone screws with a thread length of 25.4 mm
Basic ... 63-1
23-69n
The thread element deviation of tapered pipe thread is shown in A2, in which
Table A2 The limit deviation of the tooth type half angle, four-way angle and burst distance of the round pipe thread is within 25.danm
The tooth effect
pregnant type half angle deviation
+2R49r
+1'53*
±356*
Base energy Chen two
or rate deviation (25,4run)
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