JB/T 9939.2-1999 This standard is a revision of ZB J52 009.2-89 "Technical conditions for tap chucks", and editorial changes have been made in accordance with relevant regulations. The main technical content differences are as follows: - The drill diameter of the screw hole M8 in Table 4 is changed to 608mm; - The original standard 5.2 is cancelled. This standard is part of the JB/T 9939 "Tap chuck" series of standards, which includes the following two parts: JB/T 9939.1-1999 Tap chuck types and parameters JB/T 9939.2-1999 Tap chuck technical conditions This standard specifies the technical requirements, test methods, inspection rules, marking and packaging of tap chucks. This standard applies to machine tap chucks with a safety overload protection mechanism. This standard was first issued in 1983 as JB 3493-83 and revised for the first time in 1989 as ZB J52 009.2. JB/T 9939.2-1999 Technical requirements for tap chucks JB/T9939.2-1999 Standard download decompression password: www.bzxz.net

ICS25.060.20
Machinery Industry Standard of the People's Republic of China
JB/T9939.2—1999
Tap Chuck
Published on 1999-05-20
Technical Conditions
Implemented on 2000-01-01
State Bureau of Machinery Industry
JB/T9939.2-1999
This standard is a revision of ZBJ52009.2—89 "Technical Conditions for Tap Chucks". Its main technical content has not changed, and it has only been re-edited according to relevant regulations.
Differences between this standard and ZBJ52009.2—89: The drill diameter of the screw hole M8 in Table 4 is changed to 6.8mm: - The original standard 5.2 is cancelled.
This standard is part of the series of standards for tap chucks. JB/T9939, under the general title of "Tap chucks", includes the following two parts: Part I (i.e. JB/T9939.1): Types and parameters; Part II (i.e. JB/T9939.2): Technical conditions. This standard replaces ZBJ52009.2-89 from the date of implementation. This standard is proposed by the National Technical Committee for Standardization of Metal Cutting Machine Tools. This standard is under the jurisdiction of the Machine Tool Accessories Branch of the National Technical Committee for Standardization of Metal Cutting Machine Tools. The responsible drafting unit of this standard: Shanghai Machine Tool Accessories Factory No. 1. The participating drafting units of this standard: Tianjin Machine Tool Accessories Factory, Guangzhou Tool Factory, Dalian Machine Tool Accessories Factory, etc. The main drafters of this standard: Zhong Yude, Shi Shuqing, Zhuang Tianrong, Li Runde, Zhang Shijie. This standard was first issued in 1983 and revised for the first time in 1989. 1
1 Scope
Machinery Industry Standard of the People's Republic of China
Tap Chuck
Technical Conditions
This standard specifies the technical requirements, test methods, inspection rules, marking and packaging of tap chucks. This standard applies to machine tap chucks with a safety overload protection mechanism. 2 Referenced Standards
JB/T9939.2—1999
Replaces ZBJ52009.2—89
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB 1911990
GB/T1443—1996
GB/T3464.1—1994
GB/T 3837.3—1983
GB/T10944-1989
JB/T3207-1991
JB/T9935—1999
3 Requirements
Packaging, storage and transportation pictorial symbols
Self-clamping tapers for machine tools and tool handles
Machine and hand taps
Machine tool tools 7:24 taper connection tool taper shank automatic tool changer 7:24 taper tool shank for machine tools No. 40, 45 and 50 taper shank Machine tool accessories product packaging General technical conditions Preparation of random technical documents for machine tool accessories
3.1 The manufacturer should provide users with tap sleeves and torque adjustment wrenches to ensure the basic performance and use requirements of tap chucks, and ensure the interchangeability and performance of their connecting parts. 3.2 The material selection and heat treatment hardness of the main parts shall not be lower than the requirements of Table 1. Table 1
Parts Name
Chuck Body
Spring Steel
Flat Tail 35HRC
Alloy Structural Steel
The roughness R. value of the tapered working surface of the taper shank shall not be greater than 0.4μm. 3.3
Active Clutch Body
Ordinary Carbon Tool Steel
Passive Clutch Body
Disc Spring
Spring Steel
The taper of the taper shank shall be tested by coloring with a gauge, and the contact shall be close to the large end, and the contact length shall not be lower than the requirements of Table 2. Table 2
Cone type
Contact rate
Morse cone
Approved by the State Bureau of Machinery Industry on 1999-05-20
7:24 Cone
For automatic tool changewww.bzxz.net
2000-01-01 implementation
JB/T9939.2—1999
3.5 The sliding and rolling parts of the tap chuck should be flexible and should not have any jamming phenomenon. 3.6 The safety overload protection mechanism of the tap chuck should be reliable and should have a mark or description of the torque pre-adjustment range. The assembly type, specification and number of gaskets of the disc spring in the tap chuck should comply with the requirements of the drawings. 3.7
3 The tap sleeve should be tested for torque after assembly and should comply with the provisions of Table 3, with a deviation of no more than 10%. 3.8
3.9 The type and size of the connecting taper shank, Morse taper shank shall comply with the provisions of GB/T1443; 7:24 taper shank shall comply with the provisions of GB/T3837.3 or GB/T10944 respectively.
3.10 The letters, numbers, symbols, trademarks and marks on the surface of the tap chuck shall be correct and clear. 3.11
The surface of the tap chuck shall not have defects such as bumps, scratches, burrs, rust, etc. The roughness R value of its grinding surface shall not exceed 1.63.12 The surface of chrome-plated and blackened parts shall be uniform in color, blackened parts shall be glossy, and chrome-plated parts shall be matte chrome-plated. 3.13 The tap chuck shall be subjected to cutting tests. When tapping, automatic pitch compensation shall be ensured; when cutting overload, the safety clutch must be automatically disengaged to play a safety role.
4 Test methods and inspection rules
4.1 All tap chucks shall be inspected and qualified by the manufacturer before leaving the factory. 4.2 Cutting test of tap chucks
4.2.1 Cutting test shall be conducted on 2% of each batch, but shall not be less than three pieces. 4.2.2 The cutting test specification of tap chucks shall be in accordance with the provisions of Table 4. 2
Machine tool for cutting test
Cutting tool for cutting test
Test piece material
Cooling lubricant for cutting
Tapping diameter
Cutting speed
Tapping depth
Drill before tapping
Twist for hole
Drill diameter
Drill diameter
Drill diameter
Drill diameter
5Marking and packaging
JB/T9939.2—199 9
Drilling machine, milling machine or special equipment
Machine taps in GB/T3464.1
>M6~M12
15dThrough hole and blind hole
Emulsified oil
>M12~M24
170~200HBS
Aqueous solution
>M24~M42
Number of tapping
5.1The product model, specification and trademark should be clearly visible on the appearance of the tap chuck. 5.2The product packaging of the tap chuck should comply with the provisions of JB/T3207. 5.3The surface of the outer packaging box should have storage and transportation diagrams and should comply with the provisions of GB191. 5.4The technical documents accompanying the tap chuck should comply with the provisions of JB/T9935. M8
Surface roughness
R, not more than
>M42~M64
25μum
>M64~M80
No less than three through holes and blind holes
People's Republic of China
Mechanical Industry Standard
Technical Conditions for Tap Chucks
JB/T9939.2-1999
Mechanical Published by the Machinery Standardization Research Institute of the Ministry of Industry Printed by the Machinery Standardization Research Institute of the Ministry of Machinery Industry (No. 2, Shouti South Road, Beijing
Zip Code 100044)
Print Sheet 1/2 Words 8,000
Format 880×1230
First edition in July 1999 First printing in July 1999 Number of copies 1-500
Price 5.00 yuan
99-550
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