JB/T 9938-1999 This standard is a revision of ZB J52 007-89 "Technical conditions for flat-nose pliers for force-increasing machines". During the revision, only editorial changes were made according to relevant regulations, and the main technical content remained unchanged. This standard specifies the technical requirements, test methods, inspection rules, marking and packaging of flat-nose pliers for force-increasing machines. This standard applies to flat-nose pliers for manual hydraulic force-increasing machines. This standard was first issued in March 1989. JB/T 9938-1999 Technical conditions for flat-nose pliers for force-increasing machines JB/T9938-1999 standard download decompression password: www.bzxz.net

rCs 25.060.20
Machinery Industry Standard of the People's Republic of China
JBT9938-1999
Flat-nose pliers for force-increasing machines
Published on 1999-05-20
Technical conditions
Implemented on 2000-01-01
National Bureau of Machinery Industry
JB/T9938-1999
This standard is a revision of the July J52007-9 Technical Requirements for Flat-nose pliers for force-increasing machines. The original version was formulated based on the market needs of flat-nose pliers for force-increasing machines and the requirements of users. Its technical content can still meet the current level of science and technology and meet the needs of production and use. This standard is consistent with the technical content of ZBJ52007-89, and has only been re-edited according to relevant regulations. This standard shall replace ZBJ52007-89 from the date of implementation. This standard is proposed by the National Technical Committee for Standardization of Metal Cutting Machine Tools. This standard is issued by the Machine Tool Accessories Branch of the National Technical Committee for Standardization of Metal Cutting Machine Tools. The responsible unit of this standard is Nanjing Machine Tool Accessories Factory. This standard was first issued in March 1989.
Machinery Industry Standard of the People's Republic of China
Technical Conditions for Flat-Nose Pliers for Power Amplifiers
JB/T9938-1999
Replaces ZB[52007-89
This standard specifies the installation requirements, test methods, inspection rules, marking and packaging of flat-nose pliers for power amplifiers: This standard is applicable to flat-nose pliers for manual hydraulic power amplifiers. 2 Referenced Standards
The provisions contained in the following standards are the provisions of this standard through reference in this standard. When this standard is published, the versions shown are all valid. All standards will be revised, and all forces using the standard shall use the latest version of the standard. GB/T6991988
GB/T 3077—1988
B94391988
JB/T2329—1996
JB/T 3207--1991
IB/T9935—1999
3 Technical changes and test methods
Technical conditions for high-quality weak structural steel
Technical conditions for alloy structural steel
Gray casting inserts
Machine vises
General technical conditions for product packaging of machine accessories Machine accessories Random reduction of technical propertiesbzxz.net
3.1 Basic parameters shall comply with the provisions of JB/T2329 Type 1. Accuracy inspection shall comply with the specifications of JB/T2329.
3.3 Important parts shall be made of materials with performance not lower than that specified in Table 1. Zero bamboo name
Follow-motion Xiekou
IT200 (GEVT 9439 )
HI200 (GB/T 9439)
HT200 ( GrR/T 91.19)
H1300TGB/T9434
:GBT690
Zero as multiple names
43 (GB.T 699 )
45 : GT 699 )
45:GB/ 699)
40Cr (GB/T 3077 1
3.4 ​​The castings shall not have cracks, pores, sand holes, shrinkage holes, slag and cold shut defects. The defects of castings that affect the quality and appearance of use shall be repaired according to the relevant regulations.
3.5 The molding sand and adhesive materials of the parts 1. shall be carefully removed, the flash, burrs, mouth and joints shall be scraped flat, the surface of the casting shall be flat, and the unprocessed inner surface shall be coated with oil-resistant rust filter. The outer surface shall be painted with high-quality paint. 3.6 The pliers II pads, wrenches, ejectors, and cases shall all be hardened. Total hardness: 48-53HRC; wrench seat and ejector are approved by the National Machinery Industry Bureau on May 20, 1999 and implemented on January 1, 2000
JB/T9938—1 999
, etc. are not less than 52HRC: the case is not less than 40ERC, the push rod and the conversion are all in place, 3.? The movable jaws are light, flexible, and have no obstruction. Phenomenon: no-load movement, the knife in front of the end is not large 16N: 3.8 When the movable jaws are moved without load, the booster cannot generate force: when the load moves the movable jaws, the monitoring mouth tightens when the force reaches 1110 of the specified value in the table, the booster should start to increase the force: when the required force reaches the set value in Table 2, the safety device should stop increasing the force.
3.9 The end is opened in the reverse direction, and the idle travel should not exceed 45°. 3. When the booster starts to load, the idle travel of the rotating sleeve should be greater than [turns. 3. 1 Test
3..! Turn the rotating sleeve (or wrench), the tightening between the jaws is not less than the value specified in Table 2, and the tightening can be adjusted: see Table 3.
Batch width
Maximum clamping force
3.11.2 The variable tightening force test method is based on 5.3 of B/T2329-1996 (excluding the requirements of Table 5) and 3.11.1. Other equivalent methods are allowed.
3.1L.3 After the test, the accuracy should be re-checked according to 4.5 of JB 2379-1996. 3.1,4 Pressure loss test
Carry out pressure loss test according to the pressure test specified in Table 2. Within 24 hours: the positive force loss shall not be greater than 5% of the force specified in Table 2. 3.13.5 When the original discs in batch production are stable, the pressure test and pressure loss test are allowed to be carried out, and the sampled discs of each batch shall not be less than 1% (no less than three discs).
3.12 The hydraulic stopper of the half-mouth force-increasing machine shall have stable performance. 3.13 The machining surface of the parts shall have no small defects (unless otherwise specified), and the parts shall not have rust, burrs, collisions, scratches or other defects.
3.14 The two jaws are fitted together, and the misalignment of the center of the jaws shall not exceed 0.1mm. 3.[5 The scale lines, numbers and marks on the scale parts of the parts shall be correct, uniform and smooth. 4 Inspection rules: Product inspection is divided into factory inspection and special inspection. 4.1 Factory inspection Products that have passed the inspection shall be inspected and tested according to JB/T9938—1999. Factory inspection includes: inspection on the exterior quality, paint resistance, rust and packaging, etc. 4.2 Type inspection 4.2. When any of the following situations occurs, type inspection shall be considered: a) Trial production of new products or transferred products; b) The product has minor changes in design, process or materials, which may affect the product quality; d) When the company's temporary inspection agency proposes the requirement of type inspection. 4.2.2 Items of step-by-step inspection In addition to the factory inspection items, the product material, heat treatment, safety, sanitation, etc. shall also be comprehensively inspected. 5 Marking and packaging
5.1 The manufacturer's name, product model and name, and factory number shall be clearly marked on the product. 5.2 The packaging of the product shall comply with the provisions of JB/T3207. 5.3 Technical documents shall include: user manual, certificate of conformity, packing list, and the abbreviation method shall comply with the provisions of JB/T9935
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