This standard specifies the product classification, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of upper and lower circular knives for slitting. This standard applies to upper and lower circular knives for slitting machines for slitting cigarette paper, telex paper, cable paper, capacitor paper, plastics and pressure-sensitive tape. QB/T 1568-1992 Upper and lower circular knives for slitting QB/T1568-1992 Standard download decompression password: www.bzxz.net

Light Industry Standard of the People's Republic of China
Slitting upper and lower circular knives
Subject content and scope of application
QB/T1568-1992
This standard specifies the product classification, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of slitting upper and lower circular knives. This standard is applicable to the upper and lower circular knives used in slitting machines for slitting cigarette paper, telex paper, cable paper, capacitor paper, plastics and pressure-sensitive tapes. 2 Reference standards
GB/T1299 Technical conditions for alloy tool steel
GB/T2828
Batch inspection counting sampling procedures and sampling tables (applicable to inspection of continuous batches) YB/T9 Technical conditions for chromium bearing steel
ZBJ36003 Standard for metallographic inspection of tool heat treatment 3 Product classification
The upper and lower circular knives for slitting are divided into the following types: Type A is the upper slitting knife, and the type and size should comply with the provisions of Figure 1 and Table 1. Types B and C are the lower slitting knives, and the type and size should comply with the provisions of Figure 2, Figure 3, Table 2 and Table 3. Figure 1 Type A
Approved by the Ministry of Light Industry of the People's Republic of China on July 6, 1992, Industry-specific standards
Implementation on March 1, 1993
Outer diameter D
Basic dimensions
Limit deviation
Inner diameter d
Basic dimensions
QB/T 15681992
Figure 2 Type B
Figure 3 Type C
Thickness 6
Limit Deviation
Basic Dimension
Limit Deviation
Rest 12.5
Other 12.5
Basic Angle
Angle Deviation
Outer Diameter D
Basic Dimension
Inner Diameter d
Limit Deviation Basic Dimension
Outer Diameter D
Basic Dimension
Technical Requirements
Limit Deviation
QB/T 1568—1992
Height B
Limit deviation
Basic size
Inner diameter d
Basic size
Cutting edge height Bt
Basic size
Limit deviation
Height B
Limit deviation
Basic size
Limit deviation
Limit deviation
Basic angleAngle deviation
Basic angle
Products shall comply with the requirements of this standard and be manufactured in accordance with the drawings and technical documents approved by the prescribed procedures. The product shall comply with the requirements of js18 for unmarked dimensional tolerances. 4.2
4.3The main geometric and positional tolerances of the product are shown in Table 4. Table 4
Product type
Type B, C
Radial runout
Angular deviation
Cutting edge face runout
4.4The product material is 9SiCr, CrWMn, GCr15 steel, which complies with the provisions of GB/T1299 and YB/T9 respectively. Other steels with performance not lower than these materials can also be used.
4.5The hardness of the blade should be HRC58~62, and the hardness difference of the same blade should not exceed HRC3.4.6The product size tolerance and roughness should comply with the provisions of Figures 1 to 3 and Tables 1 to 3 of this standard. 4.7
Rust spots, bruises and burrs are not allowed on the machined surface. The metallographic structure should be tempered martensite. The length of martensite needles shall not be greater than level 3, and the network carbide shall not exceed level 2. 5Test method
The test method is shown in Table 5.
Outer diameter D
Determination method
Measure with vernier caliper
Slitting upper knife
Slitting lower knife
Measure with outside diameter micrometer
Standard lifting net
Car standard industry bath material negative charge system
mrrehe
Measurement diagram
Measuring tools
Vernier caliper
Outer diameter micrometer||t t||Inner diameter d
Height B
Height of lower cutting edge B1
Wall thickness h
Radial circular run-out
Cutting edge end circular run-out
Cutting edge angle
Surface roughness
Hardness and hardness difference of the same piece
Metallurgical structure
Inspection rules
6.1 Inspection classification
Determination method
QB/T 1568-1992
Continued Table 5
Measure with a plug gauge or internal micrometer
Measure at three places
Measure at three places
Measure at three places
Measure the maximum difference value by rotating 360° on the outer diameter and the end face of the cutting edge according to the viewbZxz.net
Measure three values ​​with an angle ruler
Comparison of roughness sample
Measure three points uniformly on the upper and lower circular knife surfaces at random, and the difference between the maximum and minimum values ​​is the hardness difference of the same piece
Perform according to ZBJ36003
Products are divided into factory inspection and type inspection. The factory inspection items are 4.2, 4.3, 4.5~4.7. 6.1.1
Type inspection is carried out when one of the following conditions occurs. When there are major changes in materials or processes that may affect product performance; when there are objections to product quality;
When the national supervisory agency proposes a type inspection;
In normal production, inspections are conducted once every six months;
When production is resumed after a suspension of more than six months.
6.2 Sampling and batching rules
6.2.1 Factory inspection
Simplified measurement diagram
Measuring tools
H8 stop gauge, inner diameter
micrometer
vernier caliper, outer diameter micrometer
outer diameter micrometer
outer diameter micrometer
dimension indicator, deflection meter
angle ruler
roughness sample
Rockwell hardness tester
metallographic microscope
6.2.1.1 Products of the same variety and specification with basically the same production conditions and the same feed materials shall be batched and submitted for inspection. 6.2.1.2 Product quality is divided into three categories: Class A unqualified, Class B unqualified and Class C unqualified. For Class A and Class B nonconformities, AQL is the number of nonconforming products per 100 units of product; for Class C nonconformities, AQL is the number of nonconforming products per 100 units of product. Correspondingly, when implementing sampling inspection, for Class A and Class B nonconformities, A. and R. in the sampling plan are calculated by piece (number of nonconforming products), and for Class C nonconformities, A. and R. are calculated by item (number of nonconforming products).
6.2.1.3 Provisions on inspection levels
Standard inspection standards
QB/T 1568--1992
For Class A, Class B Group I and Class C, general inspection level I is used, and for Class B Group I, special inspection level S-3 is used. 6.2.1.4 Provisions on strictness
Perform normal inspection.
6.2.1.5 Provisions for sampling plan
The sampling plan shall be carried out in accordance with the single sampling plan specified in GB/T2828. 6.2.1.6 The classification and grouping of non-conforming items are shown in Table 6. 6.2.1.7 The specified value of the acceptable quality level (AQL) is shown in Table 7. 6.2.1.8 The product quality shall be determined in accordance with GB/T2828. Table 6
Defect group
6.2.2 Type inspection
1 The blade has cracks
The inner hole does not meet the requirements;
2 The thickness does not meet the requirements;
The surface roughness of the blade face, inner hole and positive bevel does not meet the requirements. The radial run-out does not meet the requirements;
2 The end face run-out of the blade does not meet the requirements;
3 The hardness of the heat treatment does not meet the requirements;
The hardness difference of the same piece exceeds the tolerance
1 Other dimensional tolerances do not meet the requirements;
2 The appearance does not meet the requirements;
3 Other surface roughness does not meet the requirements,
4 The marking and packaging do not meet the requirements
Type inspection Randomly select one piece from the products that have passed the factory inspection, and inspect 4.4, 4.8, and 6.2.2.2
Pass.
If the type inspection is judged as unqualified, the product should be stopped from acceptance, and the reasons should be analyzed and measures should be taken until the new type inspection is completed. 7 Marking, packaging, transportation and storage
7.1 Each blade should be clearly printed with the manufacturer's name (or trademark) and manufacturing date and other marks in the appropriate position. 7.2 After each blade is cleaned and dried, it should be coated with anti-rust grease and packaged, and then packed into an ordinary wooden box. Under normal transportation and storage conditions, it will not rust within half a year from the date of leaving the factory.
7.3 The wooden box must be firm.
7.4 There should be a packing list and product certificate in the packaging box. The following contents should be clearly marked inside and outside the packaging box. 7.5
Consignee and address;
Product name and specifications;
Product gross weight and quantity;
Manufacturer name and address;
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5050.20mHuahui standard industry science and technology fee is more than the date of manufacture.
QB/T1568--1992
The product should be stored in a well-ventilated place, strictly prevent moisture, and cannot be stored with acidic items. Additional remarks:
This standard is proposed by the Technical Equipment Department of the Ministry of Light Industry. This standard is under the jurisdiction of the National Light Industry Machinery Standardization Center. This standard is drafted by Shanghai Watch Machinery Factory. The main drafters of this standard are Jin Yiyan, Qian Hui, Tian Mei, and from the date of implementation of this standard, the original Ministry of Light Industry standard QB668-1976 "Slitting Upper and Lower Circular Knife" will be invalid. 162
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