JB/T 8074.2-1999 This standard adopts JIS B 6151-1993 "Wire Chuck" in a non-equivalent manner, and is a revision of JBn 2813-85 "Technical Conditions for Three-jaw Self-centering Chucks". The writing rules are in accordance with the provisions of GB 1.1-1993, etc. The main differences between this standard and JBn 2813-85 in terms of technical content are: - Added the clamping range and appearance requirements; - Added the referenced provisions for geometric accuracy requirements; - Added the provisions for dynamic balance level, limit speed and clamping force; - Added the provisions for static balance level I, and made appropriate adjustments to II; - Cancelled the cutting test and overload test; - Cancelled the provisions for external surface roughness, bevel gear meshing requirements, wrench idle angle and idle torque requirements. This standard is part of the JB/T 8074 "Self-centering chucks for machine tools" series of standards, which includes the following two parts: JB/T 8074.1-1999 Acceptance inspection specification for self-centering chucks for machine tools (geometric accuracy inspection) JB/T 8074.2-1999 Technical conditions for self-centering chucks for machine tools This standard specifies the technical requirements, test methods, inspection rules, marking and packaging of manual self-centering chucks for machine tools (hereinafter referred to as chucks). This standard is applicable to various acceptance inspections of chucks and also guides product design. This standard was first issued in 1979 as IB 2813-79 and revised for the first time in 1985 as JBn 2813-85. JB/T 8074.2-1999 Technical conditions for manual self-centering chucks for machine tools JB/T8074.2-1999 Standard download decompression password: www.bzxz.net

ICS25.060.20
Machinery Industry Standard of the People's Republic of China
JB/T8074.2-1999
Manual Self-centering Chucks for Machine Tools
Technical Conditions
Published on 1999-05-20
Published by the State Bureau of Machinery Industry
Implementation on 2000-01-01
JB 074.21-1999
This standard is based on the technical conditions of B2813-5 three-jaw self-centering chucks with reference to 6151-19 thread chucks
This standard is roughly the same as the reference standard in terms of lower plate tightening force, dynamic balance grade and balance test method. The main differences between this standard and JBm281385 in terms of technical content are: 1. Added clamping range and appearance requirements; 2. Added references to geometric accuracy requirements; 3. Added dynamic balance level, limit speed and clamping force requirements; 4. Added static balance level 1, and made appropriate adjustments to level 2; 5. Added cutting test and overload test; 6. Added surface roughness requirements, bevel gear matching requirements, and requirements for idle angle and idle torque. This standard is part of the series of standards for manual self-centering chucks for machine tools. Under the general title of manual self-centering chucks for machine tools, J/T8074 includes the following two parts: Part 1 (i.e. B/T8074.1): Acceptance test specifications; Part 2 (i.e. BT8074.2): Acceptance technical conditions. This standard replaces B2813-85 from the date of implementation. This standard is proposed by the National Technical Committee for Metallurgical Machine Tools Standardization: This standard is a national standard for cutting machine tools. The Machine Tool Accessories Branch of the China Machine Tool Technology Committee is responsible for the drafting of this standard: Yantai Machine Tool Accessories Research Institute, Huhejie Machine Tool Accessories General Bureau! The main drafters of this standard are: Ci Hong, Wang Zhicai, and Inch Shuqing. 1 Scope
Machinery Industry Standard of the People's Republic of China
Manual Self-centering Chucks for Machine Tools
Technical Conditions
JR/TA074.2—1999
Code En2813—85
This standard specifies the manual self-centering chucks for machine tools Technical requirements, inspection methods, inspection rules and markings for sheet centering chucks (hereinafter referred to as chucks), packaging
This standard is applicable to various acceptance inspections of chucks and also guides product design. 2 Reference standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard was published, the versions shown are all valid. All standards will be revised, and the parties using this standard should explore the possibility of using the latest version of the underlined standard. JB/T3207—19 91
General technical specifications for packaging of machine tool accessories JBT8074.1-1999 Manual self-centering chuck for machine tools (geometric accuracy test) Specification for the collection and testing of machine tool accessories Technical documents JB/T9935-1999
3 Technical requirements 3.1 Chuck clamping range Chuck holding range State-owned drawings and table 1
Home Machinery Industry High 1999-05-2# Approved 2000-01-01 Implementation Chuck and hydroxyl D
Joint dimensions
Support dimensions
3.2 Appearance JB/T 8074.2-1999
2-30- 2.5-.4)
22-6330-BO
38-125
38-1t0
50-160
55-145
65-200
6--11910-T40115-2.10
195-315
50-250
120-400
100-315
The outer surface of the lower plate should be well processed and should not have cracks, rust and pores, and should not have bumps and burrs. 3.3 Transmission performance||t t||When driven by a wrench, each transmission part should run smoothly and flexibly without obvious hysteresis. 3.4 Heat treatment of materialswwW.bzxz.Net
120-40)
25-280
50-35)
150-50
170-630
150-30
170-630
The chuck body should be made of gray cast iron with a performance not lower than T300; the chuck, wire and gear should be made of high quality: the main working surface should be heat treated to the necessary hardness, and the arc surface of the chuck should be lower than 53HRC. 3.5 Balance
3.5.1 The static balance of the chuck should meet the requirements of 2. Table 2
White diameter of plate
3.5.2 Users may propose dynamic balance requirements as needed, and the level may refer to the provisions of Table 3. Table 3
Long plate diameter D
Dynamic balance level
3.6 Geometric belt
>160~315
Hole geometric accuracy requirements are in accordance with the provisions of 4.1 3.7 When the chuck is installed and the tightening force meets the requirements of Table 4, all parts should be normal. GI6
5315-630
Chuck self-diameter
Light source force
JBT8074.2--1999
2-1000
Note: The tightening force is the full radial force. 3.8 Micro-limit speed
The maximum speed is the maximum speed allowed by the chuck. The reduction is not specified, but the reduction is sufficient:) When the speed is limited to a higher speed, the theoretical clamping force should not be less than one point of the allowable static clamping force: h) The caliper is in a reverse state, and the outer end of the caliper is evenly aligned with the outer edge of the chuck. 4 Test method
4.1 Static balance test
The static balance test is shown in Figure 2. The chuck is fixed on the center circle, and the outer end of the claw is halfway between the outer edge of the disc. , and then place it on the knife 1 (or the starting type; on the half balance frame, use the method of trying to stick bricks to find out the chuck's unbalanced meters. Then
4.2 Balance level determination
The dynamic balance level can be obtained by balancing and verifying the period of error and then calculated, that is: e-grip
Chuck center of mass eccentricity, mnl;
g—small balance obtained from static balance, more than ten radius, mm;
PChuck total mass: 9
GFChuck half balance level, mms:
Lower plate angular velocity, rds
4.3 Geometric accuracy inspection
Carry out according to the provisions of 4.1 on 1st 80.
4.4 Fire tightening force determination
JB/T 8074.2—[999
Hold the dynamometer straight down, with the force measuring point as close to the end face of the chuck as possible, and use a wrench to measure the force from end to end in sequence. When the dynamometer is too large relative to the diameter of the chuck, if the chuck has a diameter not greater than 1 meter, it is allowed to use a special chuck to avoid making the chuck body too large and causing the number of chuck teeth to engage. 5 Inspection rules
Chuck inspection is divided into factory inspection and type inspection. 5.1 Each chuck shall be shipped only after passing the factory inspection. The inspection content shall include geometric accuracy, appearance, marking and packaging. 5.2 All trial and determination of type identification, or major changes in structure, material, and process that may cause changes in the chuck function, or serious instability in chuck quality, or regular and periodic quality inspections shall be conducted. Carry out type inspection, the inspection content includes all the requirements involved in this standard and the corresponding inspection methods and markings, packaging, etc. If there is no agreement between the supply and demand parties on the sampling and evaluation of type inspection, the relevant industry regulations may be followed. The static balance and clamping force test generally requires no less than three inspections.
6 Marking, packaging
6. The manufacturer's name or trademark and chuck type, specifications, etc. should be marked on the chuck. 6.2 The square wrench and screwdriver for installing the chuck should be supplied randomly: the separation jaw chuck should provide a wrench for the jaw screw. 6.3 The packaging should comply with the requirements of JB/T3207. 6.4 The random technical documents should comply with the provisions of JB/T9935, and the over-limit speed for guiding use may be specified in its relevant parts.
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