This standard specifies the product classification, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of circular knives for leather splitting machines. This standard applies to all types of circular knives for leather splitting machines in the shoemaking and leather goods industries. QB/T 1490-1992 Circular Knives for Leather Splitting Machines QB/T1490-1992 Standard download decompression password: www.bzxz.net

Light Industry Standard of the People's Republic of China
Circular Knife for Leather Splitting Machine
Subject Content and Scope of Application
QB/T1490-1992
This standard specifies the product classification, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of circular knives for leather splitting machines. This standard applies to all kinds of circular knives for leather splitting machines in the shoemaking and leather goods industries. 2 Reference Standards
GB/T230Method for Testing Rockwell Hardness of Metals
GB/T1222Spring SteelwwW.bzxz.Net
GB/T2828Batch Inspection Count Sampling Procedure and Sampling Table (Applicable to Inspection of Continuous Batch)QB1525Method for Compiling Product Models of Shoemaking Machinery 3 Product Classification
3.1Product model compilation shall comply with the provisions of QB1525. 3.2Product type shall be specified in Figure 1.
3.3The basic size series of products shall be specified in Table 1. HRC 5862
Vertical - 48
Approved by the Ministry of Light Industry of the People's Republic of China on April 14, 1992$34 H7(+9: 025
Implemented on December 1, 1992
Note: Other specifications should be implemented in accordance with the same.
4 Technical requirements
QB/T 14901992
Basic dimensions
g117×112×54
$150×$144X75
4.1 The circular knife shall comply with the requirements of this standard and be manufactured in accordance with the technical documents approved by the prescribed procedures. mm
4.2 The circular knife material shall be 65Mn spring steel or other materials with performance equivalent to 65Mn, and shall comply with GB/T1222 or other corresponding standards. ·
4.3 The heat treatment hardness of the working part of the circular knife is HRC58~62, and the inner and outer diameter tolerance of the working part 14.4 The circular knife installation positioning hole is $34H7 (+℃025) is IT12. 4.5 round The surface roughness of the inner and outer circles, outer end faces and installation positioning holes of the cutter is R≤1.6μm4.6 The circular runout tolerance of the inner surface of the circular cutter to the axis of the installation positioning hole is grade 8. 4.7 The working part of the circular cutter shall not have defects such as cracks and chipping. 5 Test method
5.1 Article 4.3 of this standard shall be carried out using a Rockwell hardness tester in accordance with the provisions of GB/T230. Three points shall be measured in the front, middle and back of the working part. The average value and error shall meet the requirements.
5.2 Article 4.5 of this standard shall be measured by comparison with standard specimens or measured with a surface roughness measuring instrument. 5.3 Articles 4 and 4 of this standard shall use smooth limit gauges to inspect the installation positioning holes, and use universal measuring tools to measure the inner and outer diameters. 5.4 This Article 4.6 of the standard uses a dial indicator with a special testing fixture for measurement, see Appendix A (supplement). 5.5 Article 4.7 of this standard is measured.
6 Inspection rules
6.1 Factory inspection
6.1.1 The following items must be fully inspected before leaving the factory. The circular knife installation positioning hole shall comply with the provisions of Article 4.4; the circular knife inner surface to the installation positioning hole axis circular runout error shall comply with the provisions of Article 4.6: c
The appearance quality of the circular knife shall comply with the provisions of Article 4.7. The hardness of the working part of the circular knife and other items shall be inspected according to the sampling plan specified in GB/T2828. 6.1.2
Inspection level: For hardness, the special inspection level S-2 is adopted; for other items Adopt general inspection level 1; a.
Type and strictness of sampling plan: use one sampling, start with normal inspection, and adjust the strictness according to the procedures specified in GB/T2828h.
during the implementation of the inspection;
the qualified quality level (AQL) value is self-determined.
6.2 Type inspection
6.2.1 Type inspection must be carried out in any of the following situations. a.
When new products are trial-made and identified;
when there are major changes in raw materials and processing technology that may affect product performance; when the product is suspended for more than half a year and then resumed; once a quarter,
QB/T 1490-1992
when the national quality supervision agency proposes a type inspection requirement. 6.2.2 Type inspection samples should be randomly sampled by 1%, but not less than 10 pieces. If the random inspection fails, double random inspection shall be conducted. If the product still fails, the batch of products shall be deemed unqualified. 7 Marking, packaging, transportation and storage
7.1 Each round knife shall be clearly marked with the manufacturer's trademark. 7.2 Each round knife shall be coated with anti-rust oil, wrapped with anti-rust paper or plastic bag, packed in plastic basin or paper box, and valid with certificate of conformity. Under normal transportation and storage conditions, there shall be no rust within one year after leaving the factory. 7.3 The round knives shall be packed in wooden boxes for export. The packaging shall be firm. There shall be a packing list in the box, and the following contents shall be marked on the outside of the box:
Receiving unit and address;
Product name and model specifications;
Gross weight and quantity:
Manufacturer name and address 1
Production date;
Anti-shading and heavy pressure mark.
7:4 The product shall be placed gently during transportation and shall not be subjected to heavy pressure, collision or rain. 7.5 The product should be stored in a ventilated and dry place, and there should be no corrosive gas around it. 145
A1 Special test fixture for circular runout, see Figure A1. Additional instructions:
QB/T1490—1992
Special test fixture for circular runout
(Supplement)
This standard is proposed by the Technical Equipment Department of the Ministry of Light Industry. This standard is under the jurisdiction of the National Fur Leather Standardization Center. This standard was drafted by Huzhou Lifu Tool Factory and Yangzhou Tool Factory. The main drafters of this standard are Li Sheng and Zhang Xun. 146
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