JB/T 9988.3-1999 This standard is a revision of ZB J41 002.3-87 "Technical conditions for high-precision trapezoidal thread broaching taps". During the revision, the chapter on performance test was deleted, and editorial changes were made in accordance with relevant regulations. Other technical contents remained unchanged. This standard is part of the JB/T 9988 series of standards "High-precision trapezoidal thread broaching taps". This series of standards includes the following three parts: JB/T 9988.1: Type and size JB/T 9988.2: Thread tolerance JB/T 9988.3: Technical conditions This standard specifies the technical requirements for high-precision trapezoidal thread broaching taps, and the basic requirements for marking and packaging. This standard is applicable to high-precision trapezoidal thread broaching taps used for machining trapezoidal threads (according to JB/T 2886-1992 "Technical conditions for machine tool trapezoidal screws and nuts" for grades 7, 8, and 9 not matched as nuts). This standard was first published on the date of the year. JB/T 9988.3-1999 High-precision trapezoidal thread broaching taps Part 3: Technical conditions JB/T9988.3-1999 Standard download decompression password: www.bzxz.net

JCs 25.100.50
Machinery Industry Standard of the People's Republic of China
JB/T9988.19988.3-1999
High Precision Trapezoidal Thread Broaching Taps
1999-05-20 Issued
National Bureau of Machinery Industry
2000-01-01 Implementation
JBT9988.3-1999
This is a revision of the technical requirements for high-precision trapezoidal thread broaching taps ZBJ41002.JS7. During the revision, except for the performance test chapter, logical revisions were made according to relevant regulations: other technical requirements were not included. This standard is part of the JB/T9988 series of standards for high-precision trapezoidal thread broaching taps. The series of standards includes the following parts: JB/T9988.1-1999 High-precision trapezoidal thread broaching taps Part 1: Type and size 9B82-1 High-precision trapezoidal thread broaching taps Part 2: Thread tolerance BT9.3-1 High-precision trapezoidal thread broaching taps Part 3: Technical conditions This standard replaces ZBJ41002.3B7 from the date of implementation. This standard is proposed and approved by the National Tool Standardization Technical Committee. The responsible drafting unit of this standard: Chengdu Institute of Technology. The main drafters of this standard: Deng Tipan, Wang Shangxiao, Li Niulu, Zhang Guang, Bo Juwei, Pai Yiling, Xia Yu. Scope
Machinery Industry Standard of the People's Republic of China
High Precision Trapezoidal Thread Broaching Taps
Part 3: Technical Conditions
JE/T9988.3-1999
Replacement 20 141 0023-87
This standard specifies the technical requirements for high precision ribbon-shaped thread drawing taps and the basic requirements for marking packaging. This standard is applicable to +1 trapezoidal thread broaching taps (continuing from JB/T2886-1992 Machine Thread Broaching Taps, Class No. 78, 9 Non-matching Thread Broaching Taps) (hereinafter referred to as "thread broaching taps"). Referenced Standards
The texts contained in the following standards constitute the texts of this standard through their use in the individual standards. When this standard was published, the versions shown were all valid. All standards will be considered. All parties using this standard shall discuss the validity of the latest version of the following standards. 2886:992
Machine tool trapezoidal thread, technical conditions for thread JE/T9988.2-1999 High-comb thread specification wire cutting chain Part 2: Thread tolerance 3 Technical requirements
3.1 The thread surface shall not have cracks, marks, rust, burn-in and other defects that affect the performance. 3.2 Surface roughness of thread chain 1wwW.bzxz.Net
Thread surface: including 1
The front of the tooth
The back of the tooth
The leading and trailing surface of the handle
The connection between the front of the tap and the threading should be smooth 3.33
Thread 3.4 The efficiency tolerance of the wire chain shall comply with the provisions of B9988.2. The middle diameter shall be at the beginning of the calibration part. 3.5 The radial deviation of the outer diameter of the wire threading part (the tooth part is the human diameter) from the public axis is given in Table 2. Table 2 3.6 The thread type of the wire chain shall be needle-ground (including the teeth), the major diameter of the calibration part shall have a taper: Approved by the State Machinery Industry Bureau on May 20, 1999 10 3.5 The radial deviation of the outer diameter of the wire threading part (the tooth part is the human diameter) from the public axis is given in Table 2. Table 2 3.6 The thread type of the wire chain shall be needle-ground (including the teeth), the major diameter of the calibration part shall have a taper: Approved by the State Machinery Industry Bureau on May 20, 1999 10 3.5 The radial deviation of the outer diameter of the wire threading part (the tooth part is the human diameter) from the public axis is given in Table 2. Implementation
3.7 Incomplete teeth of the tap should be repaired
3.8 The length tolerance of each part of the tap is 18J8/T9988.3-1999
3.9 The tap is made of W6Mo5Cr4V2 or other grades of high-grade T tool steel with equivalent performance. 3.10 The following provisions shall be followed:
Knife end and rear guide part:
Front guide part:
Handle part:
6S-66HRC;
60-66HRC:
40-52HRC
3.1 The tap is allowed to undergo surface strengthening treatment.
4 Marking and packaging
4.1 Marking
4. 1. 1 Product markings: a) Manufacturer or seller's trademark: b) Wire code and thread grade: c) Wire thread travel direction (left-hand screw mark L, right-hand screw mark) Wire thread broaching length: e) Coarse tap mark for grouped wires: material code. 4.1.2 Packaging boxes should be marked with: a) Manufacturer's name, address and trademark: b) Wire mark: c) Material code or brand: d) Number of pieces: e) Year and month, 4.2 Packaging: Wire chains should be treated with rust prevention before packaging. The packaging must be firm and prevent damage during transportation.
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