JB/T 9998-1999 This standard is a revision of ZB J41 015-89 "55° tapered pipe thread round die". During the revision, the hardness value of the round die was adjusted, and the provisions for the sample size of the tool and the evaluation conclusion of the test results were added. Editorial modifications were made in accordance with relevant regulations, and other technical contents remained unchanged. The original standard non-equivalently adopted the international standard ISO 4230-1987 "R series of hand and machine round dies for tapered pipe threads". This standard specifies the type and size, technical requirements, performance tests, and basic requirements for marking and packaging of 55° tapered pipe thread round dies (hereinafter referred to as round dies). This standard applies to R series round dies for processing pipe threads for threaded sealing (according to GB/T 7306-1987 "Pipe threads for threaded sealing"). This standard was first published on the date of the year. JB/T 9998-1999 55° tapered pipe thread round die JB/T9998-1999 Standard download decompression password: www.bzxz.net

JC525.100.50
Machinery Industry Standard of the People's Republic of China
JB/T9998-1999
55° Tapered Pipe Thread Round Die
Published on 1999-05-20
National Taocheng Industry Bureau
2000-01-01 Implementation
JB/T9999-1999
This standard is a revision of ZBJ4101589°55 wind pipe screw thread ", and the hardness value of the thread drawing teeth is adjusted, and the size of the tool sample is increased to determine the evaluation conclusion of the test results. Editorial changes have been made to the relevant regulations, and other technical contents have not changed.
The original standard adopts the national standard IS04230-1987 "Hand and machine dies for threaded threads-R series". This standard will be implemented from ZBJ4!015mm89, this standard is proposed by the National Tool Standardization Technical Committee, and the responsible unit for this standard is: Chengdu Institute of Technology. The main contributors of this standard are: Tigui, Yin Cehe, Chen Wanhua, Xia Xia. Fan Yuan
Machinery Industry Standard of the People's Republic of China
55° Tapered Pipe Thread Round Die
JH/Gate 9998-1999
Generation 41015-
The standard specifies the type and size, technical requirements of 55° Tapered Pipe Thread Round Die (hereinafter referred to as Round Die). Basic requirements for performance testing, marking and packaging.
This standard applies to the processing of R series round dies for pipe threads with frequency-effect seals (according to GST7306-19S "Pipe Threads with Thread Seals").
2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard by being referenced in this standard. When this standard is published, the versions shown are valid. All standards will be revised. All parties using this standard should consider the possibility of using the latest versions of the following standards. GB/T 7306-1988: Types and dimensions of pipe threads sealed with threaded seals
3.! The types of round teeth are shown in Table 1. The dimensions are given in Table 1. AA
3.2 Marking example
Pipe thread, round teeth with code R are marked as
JBT9998-1999
55 Male pipe thread test die R
Beijing Machinery Industry Co., Ltd. 1999-05-20 Approved 2000-01-01 Implementation
China
Basic diameter
JB/T999 8-1999
1 Basic K degree! The size of the workpiece is the requirement for the workpiece. The design of the surrounding plate teeth is based on this. 2 The size of the plate teeth is determined by the manufacturer: 3 The size of 14 and 25 is allowed to be 16 and 28. Production technical requirements
4. The plate teeth table is too small to have cracks, front edges, marks, grinding burns and other defects that affect the usability. 4.2 The roughness of the matching teeth table is determined as follows:
) External circle, end:
b) Block cutting edge front and back:
c) Thread surface:
R, 12.5μmo
4.3 The size tolerance of the outer D of the circle plate teeth is f10, and the thickness E is 1512. 4.4 The position of the circular plate teeth is given in Table 2. Table 2
K--RZ
Foreign countries face the axis of the scorpion axis of the control time reading dynamic mosquito axis war face of the face of the 0.15
The length of the tooth
The minimum length of the tooth
The cutting edge of the front edge of the material to the outside of the material
4.5 Reading plate teeth are made of S-T or other alloys with equivalent performance. The hardness of the corrugated part is not less than 60HRC. According to the wide range of use, it can also be made of continuous steel, and the corrugated part is not less than 62HRC.5 Performance test
5.1 For the round plate teeth produced in batches, each batch shall be sampled for reverse cutting performance test. 5.1 Test pieces
5.2.1 Machine tools: Machine tools that meet the precision requirements, 5.2.2 Cutting tools: The minimum sample size is 5 pieces. www.bzxz.net
JB/T9998—1999
5.2.3 Specification: Material is 45mm, sugar gland range is 170~200HB5.2.4 Cutting concentration: emulsified oil water solution, flow rate should not be less than 5L/m5.2.5 Cutting specification: given in Table 3.
5.3 Evaluation of test results
ar/rtin
Total length of cutting thread
The mesh teeth after test shall not have sand or wear phenomenon, and shall maintain its original performance. The thread accuracy of the test piece meets the frequency mark of the test teeth, and the roughness of the thread is 25mm. If any piece does not meet the above requirements, the batch of mesh teeth shall be judged as unqualified.
Marking and packaging
6. 1 Marking
6.1.1 The product should be marked with:
8) Manufacturer or distributor trademark:
b) Thread code:
c) Material code: HSS for ordinary high-tech steel, and 9SiCr and other alloys for the production of ...
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