JB/T 9937.3-1999 This standard is a revision of ZB J52 006.3-89 "Technical conditions for high-precision machine pliers". During the revision, only editorial changes were made according to relevant regulations, and the main technical content remained unchanged. This standard is part of the JB/T 9937 "High-precision machine pliers" series of standards, which includes the following three parts: JB/T 9937.1-1999 High-precision machine pliers parameters JB/T 9937.2-1999 High-precision machine pliers accuracy inspection JB/T 9937.3-1999 High-precision machine pliers technical conditions This standard specifies the technical requirements, inspection rules, marking and packaging of high-precision machine pliers. This standard applies to high-precision machine pliers used in surface grinders, tool grinders and other precision machine tools. This standard was first issued in March 1989. JB/T 9937.3-1999 Technical requirements for high-precision machine flat-nose pliers JB/T9937.3-1999 Standard download decompression password: www.bzxz.net

ICS25.060.20
Machinery Industry Standard of the People's Republic of China
JB/T9937.1~9937.3—1999
High Precision Machine Pliers
1599-05-20 Issued
National Bureau of Machinery Industry
2000-01-01 Implementation
JB9937.3-1999
Small Selection Standard for High-precision Machine-made Flat Pliers (2006.3-8) "This standard is formulated according to the needs of the auction market and the use requirements of high-precision machines. Its technical content can still meet the current scientific and technological level. The production and use of this standard is consistent with the technical content of 2BJ52 (06.3-89. Only the relevant regulations are re-edited. This standard is part of the series of standards for high-precision machine-made flat-nose pliers. Under the general title of "Standard for High-precision Machine-made Flat-nose Pliers", it includes the following three parts:
Part 1 is 3 parameters:
Part 2 (ie JB9937.2: Precision Inspection Inspection: Part 1 (i.e. JB9937.3): Technical conditions. This standard was first issued in March 1989. The standard was proposed by the National Metal Cutting Machine Tool Standardization Technical Committee in 1989. This standard is under the jurisdiction of the Machine Tool Accessories Branch of the National Metal Cutting Machine Tool Standardization Technical Committee. The responsible unit for this standard is Nanjing Machine Tool Parts Factory. The participating units for this standard are Tianyang Machine Tool Parts Factory. This standard was first issued in March 1989. The standard of the People's Republic of China Machinery Industry Standards High Precision Machine Vises, Technical Conditions, and the standard specifies the technical requirements, inspection, marking, and packaging of high precision machine vises. [日/9937.3—1999
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This standard applies to high-precision machine tools used in pressure gauges, tool presses and other precision machines: 2 Referenced standards
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 the parties using this standard should consider the possibility of using the new version of the following standards. JBT3207-1991
IR/T 9935-1999
3 Technical requirements
General technical conditions for the packaging of machine tool parts Compilation of random technical documents of machine tool parts
3.1 The jaws and movable jaws shall be made of materials with performance not lower than that of alloy steel. 3.2 The working surfaces of the jaws and movable jaws shall be hardened and the stiffness shall not be lower than 5BHRC. 3.3 The jaws and movable jaws shall be treated with absolute stability. 3.4 The movable jaws shall be light and flexible when moving without resistance. 3.5 The surface roughness R value of the jaws and movable jaws shall not be greater than 0.8 mm. 3.6 The surface of the parts shall not have sharp angles and burrs. 3. The exposed surface of the parts shall not have rust, collision and other indentations. 3. When the two jaws are fitted together, the top and side surfaces of the movable jaws shall not protrude from the top and side surfaces of the jaws. The misalignment shall not exceed 0.05 mm on the surface and 0.20 mm on the side surface.
4 Inspection rules
4.1 Factory inspection
The factory inspection items for each product shall include: towing test, external gauge quality, painting, anti-rust equipment, etc., and the product can be shipped only after passing the inspection.
4.2 Type inspectionwwW.bzxz.Net
4.2.1 Type inspection shall be carried out in any of the following situations: a) Trial and setting of new products or transferred products; b) When the product has undergone major changes in design, process or material, which may affect the performance of the product; e) When normal production is stopped, sampling control is carried out according to the specified period or production; d) When the national quality supervision agency proposes the requirement for type inspection. 4.2.2 In addition to the inspection items, the type inspection items shall also include comprehensive inspection of product materials, heat treatment, safety, and workmanship. Approved by the China Machinery Industry Corporation on May 20, 1999. Implementation date: January 1, 2000. 5. Marking and packaging JB/T9937.3—1999 5.1 The product shall be clearly marked with the manufacturer’s name or trademark, product model, specification, name, factory serial number and accuracy grade (grade 2 shall not be marked) 5.2 The packaging of the product shall comply with the provisions of JB/3207 5.3 The random technical documents of the product shall include: instructions for use, certificate of conformity and packing list. The writing method shall comply with the provisions of JB/T9935.
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