This standard specifies the product classification, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of grooved pulping machine knives. This standard applies to the blades used in grooved pulping machines in the papermaking industry. QB/T 1570-1992 Groove-type pulping machine knives QB/T1570-1992 Standard download decompression password: www.bzxz.net

Light Industry Standard of the People's Republic of China
Trough beater knives
Subject content and scope of application
QB/T1570-1992
This standard specifies the product classification, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of trough beater knives. This standard applies to the blades used in trough beaters in the papermaking industry. 2 Reference standards
GB/T699 Technical conditions for high-quality carbon structural steel GB/T2828 Batch inspection counting sampling procedures and sampling tables (applicable to continuous batch inspection) 3 Product classification
3.1 Trough beater knives (hereinafter referred to as "blades") are divided into two types: trough beater flying knives (hereinafter referred to as "flying knives") and trough beater bottom knife groups (hereinafter referred to as "bottom knife groups"). According to the different types of bottom knife groups, they are divided into straight bottom knife groups and curved bottom knife groups, among which the straight bottom knife groups are divided into left-hand and right-hand types. The types of blades shall conform to the provisions of Figures 1 to 4 respectively. 3.2 The thickness of the blade is 4, 6, 8, 10, 1214mm. Back
Figure 2 Left-hand straight bottom knife set
Approved by the Ministry of Light Industry of the People's Republic of China on July 6, 1992 190
Semi-standard industry bath fee down payment
1993-03-01 implementation
Technical requirements
QB/T 1570 --- 1992
Figure 3 Right-hand straight bottom knife set
Figure 4 Curved bottom knife set
4.1 The product shall conform to the provisions of this standard and be manufactured in accordance with the drawings and technical documents approved by the prescribed procedures. The blade is made of 65Mn material, and its performance shall conform to the provisions of GB/T699. Other materials with performance not lower than this steel may also be used. 4.2
The hardness of the blade is HB200~285.
The width of the fastening groove of the fly cutter (a) is 20~50mm. The dimensional tolerance shall comply with the provisions of Table 1.
Length L
The fly cutter shall not have cracks.
The straightness of the back of the fly cutter shall not exceed 1.0mm. Thickness H
3The straightness of the length direction on the thickness surface of the fly cutter blade shall not exceed 1.5mm. 4.8
4.9The dimensional tolerance of the bottom knife group shall comply with the provisions of Table 2. Table 2
Length L
Width B
The lining wood of the bottom knife group is required to be flat, and its humidity is not more than 20%. The material is hardwood. 4.10
Bolts (nails) generally use hexagonal head bolts, and countersunk screws can also be used. Their technical conditions shall comply with the provisions of relevant standards. 4.11
The deviation of the arc radius R of the bottom knife set from the standard sample shall not exceed 2mm. 4.12
The surface shall be free of burrs and bumps.
Quasi-heat solid mesh
Standard material labor room
Test method
The test method shall comply with the provisions of Table 3.
Thickness H
Slot width a
Back of the blade
Direction of the blade length
Straightness
Length of the bottom knife set
Width of the bottom knife set
Height of the bottom knife set
Radius of arc R
Material Yu degree
QB/T 1570
Measurement method
Use a steel tape measure to measure the blade length in the middle of the blade width. Use a vernier caliper to measure a point in the middle of the blade and two points 50 mm away from both ends.
Use a vernier caliper to measure a point in the middle of the blade and two points 50 mm away from both ends.
Use a caliper to measure two points between 5 and (ha/2) mm from the ends.
Use a caliper to measure two points between 5 and (ha/2) mm from the ends.
Select the middle part of the blade width. Measure the hardness at three points in the middle part of the length and 50 mm away from both ends.
Put a flat ruler vertically on the back of the blade and use a feeler gauge to measure the maximum gap. When it is convex in the middle, insert a feeler gauge of equal thickness at both ends, and then use the feeler gauge to measure the minimum gap. The thickness of the fixed feeler gauge minus the minimum gap is the straightness of this item.
Put the blade edge ruler vertically on the blade, and use the feeler gauge to measure the maximum gap.
Use a steel tape measure to measure the blade length in the middle of the blade width.
Use a steel tape measure to measure the length at one point in the middle and two points 50mm away from both ends of the blade.
Use a steel tape measure to measure the highest point at both ends of the knife set.
Put the sample 50mm away from both ends of the knife set. mm and a point in the middle, measure the gap with a feeler gauge
Measure with a wood moisture meter
Accurate holding net
mrreos
Measuring tube diagram
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Measuring tools
Steel tape measure
Vernier caliper
Vernier caliper||t t||Vernier caliperbzxZ.net
Vernier caliper
Rockwell hardness tester or
Brinell hardness tester
Special gauge feeler gauge
Special gauge match
Steel tape measure
Steel tape measure
Steel tape measure
Sample, tape measure
Wood moisture meter
Inspection rules
Inspection classification
Blades are divided into factory inspection and type inspection. QB/T 1570-- 1992
6.1.1 The factory inspection items are 4.3 to 4.13 of this standard. 6. 1.2
Type inspection shall be carried out in any of the following situations. a.
When there are major changes in materials and processes that may affect product performance; when there are objections to product quality;
When the national supervisory agency proposes a type inspection; during normal production, the inspection shall be 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
6.2.1.1 Products of the same variety and specification with basically the same production conditions and the same materials are batched and submitted for inspection. 6.2.1.2 Blade quality is divided into three types: Class A unqualified, Class B unqualified and Class C unqualified (the bottom knife group only has Class B unqualified and Class C unqualified). For Class A and B unqualified, AQL is the number of unqualified products per 100 units of products; for Class C unqualified, AQL is the number of unqualified products per 100 units of products. Correspondingly, when implementing sampling inspection, for Class A and B unqualified, A in the sampling plan. And R. Count by piece (number of non-conforming products), for Class C non-conforming, A. and R are counted by item (number of non-conforming). 6.2.1.3 Provisions on inspection level
For Class A, Class B Group I, and Class C, general inspection level I shall be carried out, and for Class B Group I, special inspection level S-3 shall be carried out. 6.2.1.4 Provisions on strictness
Perform normal inspection.
6.2.1.5 Provisions on 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 shall be in accordance with the provisions of Table 4 and Table 6. The specified value of the acceptable quality level (AQL) shall be in accordance with the provisions of Table 5 and Table 7. 6.2.1.7
The inspection results shall be determined in accordance with GB/T2828. Table 4
Classification of flying cutter defects
Cracks
Solid edge e out of tolerance;
Thickness out of tolerance,
Straightness in length direction out of tolerance
Hardness does not meet the standard requirements
Width out of tolerance;
Back straightness out of tolerance,
Fastening groove width out of tolerance;
Length out of tolerance;
5Appearance does not meet the standard requirements:
6Packaging does not meet the standard requirements;
Other items do not meet the standard requirements
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Defect group
Defect group
6.2.2 Type inspection
QB/T 1570 - 1992
AQL value of various defects of flying knife
Table 6 Defect classification of bottom knife group
Radius R dimension out of tolerance;
Length dimension out of tolerance,
Width dimension out of tolerance:
Height dimension out of tolerance
Hardness does not meet the standard requirements
Wooden board dryness out of tolerance;
Wooden board does not meet the standard requirements;
Bolts, nuts, washers do not meet the standard requirements; Appearance does not meet the standard requirements;
Packaging does not meet the standard requirements;
Other items do not meet the requirements
AQL value of various defects of bottom knife group
6.2.2.1 Type inspection Randomly select pieces from the products that have passed the factory inspection and inspect 4.2. 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 mark, packaging, transportation and storage
Each blade should be clearly printed with the manufacturer's name (or trademark) and manufacturing date and other marks in the appropriate position. 7.1
7.2After cleaning and drying, each blade should be coated with anti-rust grease, and packed with anti-rust paper and tied firmly. Under normal transportation and storage conditions, it will not rust within half a year from the date of leaving the factory.
7.3The following contents should be clearly marked on the outside of the package: a.
Receiving unit and address;
Product name and specifications;
Product gross weight and quantity;
Manufacturer name and address:
Quasi-heat real net
m standard line labor fee element
Factory date.
QB/T1570-1992
7.4 The product should be stored in a well-ventilated place to prevent moisture and should not be stored together with acidic items. Additional notes:
This standard was 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 was drafted by Tianjin Cutting Tool Factory. The main drafters of this standard are Liu Yunsheng and Tian Mei. From the date of implementation of this standard, the original Ministry of Light Industry standard QB670-1976 "Technical Conditions for Grooved Beater Knives" will be invalid. Standard Rejection Technology Network
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