This standard specifies the product classification, technical requirements, test methods, inspection rules, packaging, marking, transportation and storage of pipe cutters (hereinafter referred to as "cutters"). QB/T 2350-1997 Pipe cutters QB/T2350-1997 Standard download decompression password: www.bzxz.net

QB/T2350-1997
This standard specifies the product classification, technical requirements, test methods, inspection rules, packaging, marking, transportation and storage of pipe cutters. When formulating this standard, a number of technical requirements and test methods in international advanced standards were adopted, such as assembly requirements, sharpness and other quality requirements, so as to ensure the reliability of product performance and service life. Appendix A of this standard is an illustrated appendix.
This standard was proposed by the Quality Standards Department of China Light Industry Association. This standard is under the jurisdiction of the National Tool Hardware Standardization Center. The drafting units of this standard: Shanghai Tool Industry Research Institute, Shanghai Qianjin Machinery Factory. The main drafters of this standard: Cheng Yongfeng, Xu Haiwen. 688
1 Scope
Light Industry Standard of the People's Republic of China
Pipe Cutting
QB/T23501997
This standard specifies the product classification, technical requirements, test methods, inspection rules, packaging, marking, transportation and storage of pipe cutting knives (hereinafter referred to as "cutting knives").
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 parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T 230--~1991
GB/T 699—1988
Metallic Rockwell hardness test method
Technical conditions for high-quality carbon structural steel
GB/T 1173--1995
GB/T 1528-1987
GB/T 2828-1987
GB/T 2829—1987
GB/T 3091---1993
GB/T 5305---1985
GB/T 9440--1988
YB(T)1—1980
3 Product classification
3.1 Type
Cast aluminum alloy
Drawn steel pipe
Count sampling procedure and sampling table for batch inspection (applicable to inspection of continuous batches)Count sampling procedure and sampling table for periodic inspection (applicable to inspection of stability of production process)Galvanized welded steel pipe for low-pressure fluid transportation
Hand toolsPackaging, marking, transportation and storageForgeable cast iron parts
High carbon chromium bearing steel
Cutter types are divided into "general type" and "light type" according to the different materials of the pipes they cut. The general type is suitable for cutting ordinary carbon tangled steel pipes, codenamed "GT" (as shown in Figure 1). The light type is suitable for cutting plastic pipes and copper pipes, codenamed "GQ" (as shown in Figure 2). 3.2 Specifications and basic parameters
The specifications of the cutter are divided into four types according to the maximum outer diameter and wall thickness of the pipe that can be cut, and the codes are No. 1, No. 2, No. 3, and No. 4. The basic parameters of the cutter are shown in Table 1.
Approved by China Light Industry Association on January 16, 1998
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Implemented on September 1, 1998
Specification code
QB/T2350-1997
1-Cutter body, 2-Blade: 3- Slider; 4-roller; 5-axis pin; 6-screw rod: 7-handle pin: 8-handle Figure 1 Universal cutting force
1-cutter body, 2-scraper blade; 3-blade; 4-blade screw; 5-cutter bar; 6-support spring; 7-scraper pin; 8-screw rod; 9 nut; 10-handwheel; 11-pad; 12-roller shaft; 13-roller; 14-semicircle head screw Figure 2 Light cutter Www.bzxZ.net
Basic size
Left M8×1 ||tt| ... 2350--1997
The marking of the cutting knife consists of the product name, model code, specification code and standard number. Example: The general-purpose cutting knife No. 2 should be marked as pipe cutting knife GT-2QB/T2350
4 Technical requirements
4.1 Materials
In addition to complying with the provisions of Table 2, the materials of the main parts of the cutting knife can also be made of other materials that can meet the requirements of this standard. Table 2
Part name
Cutting body and slider
GCr15 specified in YB(T)1
45 steel specified in GB/T699
KTH350-10 specified in GB/T9440
GB/T 1173 ZL104
Cutter main parts heat treatment hardness: blade hardness 53 ~ 62HRC, roller hardness 45 ~ 53HRC. 4.3 Sharpness
Cutter should be able to cut the pipe according to the requirements specified in Table 3. Table 3
Test selected pipe
Specification code
Outer diameter × wall thickness
33.50X3.25
114×4
Nominal diameter
1GQ type cutter test selected pipe materials and specifications in accordance with GB/T1528 2GT type cutter test selected pipe materials and specifications in accordance with GB/T 3091. 4.4 Assembly requirements
Number of rotations
2 times or less
2.5 times or less
3 times or less
3.5 times or less
4.4.1 The slider of the cutter should be able to move flexibly on the guide rail of the cutter body, and the blade and roller should be able to rotate freely. Torque/N·m
4.4.2 The blade should be interchangeable (blade size see Appendix A). When interchangeable, the blade should be able to cooperate with the cutter body without any processing. 4.4.3 The cutter rotates one circle on the pipe wall, and the knife marks must overlap. 4.5 Surface quality
The surface of the cutter shall not have cracks and harmful scars, burrs, rust, and the casting surface shall not have obvious defects such as sand holes and pores. 4.5.1
The decorative protective coating on the surface of the cutter should be uniform and bright in color, and there should be no defects such as delamination, bubbles, and flow marks. 5 Test method
Hardness test
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QB/T2350--1997
Hardness is tested in accordance with the provisions of GB/T230, and the test position should be on the end face of each part. 5.2 Sharpness test
The test is carried out in accordance with the provisions of Table 3. The cutter is installed on the test tube, and the handle or hand wheel is rotated to make the blade cut into the test tube. Then the torque value specified in Table 3 is added to the end of the screw rod. Within the specified number of turns, the test tube should be cut. At this time, the parts of the cutter should not be permanently deformed or damaged. This test is generally carried out during type inspection.
5.3 Assembly performance test
5.3.1 The flexibility of the slider moving on the guide rail of the cutter body is tested by hand feel. 5.3.2 Randomly select the blade and interchange it without any processing. 5.3.3 As shown in Figure 3, clamp one end of a round steel bar with a surface roughness R value not greater than 3.2um with a bench vise. After the cutter rotates one circle on the test bar, the cutting track must overlap. Bench vise
5.4 Surface quality
Cutting track
The surface quality of the cutter is visually inspected and must comply with the provisions of 4.5. 6 Inspection rules
6.1 Products must pass the inspection before leaving the factory, and a product certificate must be attached. Cutting knife
6.2 The acceptance inspection of the cutting knife shall be carried out according to the secondary sampling plan specified in GB/T2828. The classification of unqualified products, inspection items, qualified quality level (AQL), ​​number of unqualified products per 100 units of products), and inspection level IL are shown in Table 4. Table 4
Classification of non-conforming
Inspection items
4.2 Hardness
4.4 Assembly requirements
4.5 Surface quality
Qualified quality level AQL
6.3 Products rejected after inspection can be classified or repaired by the manufacturer and resubmitted for inspection. 6.4 When one of the following situations occurs, the cutter should generally be subjected to type inspection. a) When the product is transferred to another production line, transferred to another factory, or resumed after suspension; b) When the product has a major change or redesign in structure, material, or process; c) Under normal circumstances, the product should be inspected once every two years. 692
Inspection level I
QB/T 2350—1997
6.5 The type inspection of the cutter shall be carried out according to the secondary sampling plan specified in GB/T2829. The inspection items, nonconforming quality level (RQL) (number of nonconforming products per 100 units) and discrimination level (DL) are shown in Table 5. Table 5
Nonconforming classification
Packaging, marking, transportation and storage
Inspection items
4.2 Hardness
4.3 Sharpness
4.4 Assembly requirements
4.5 Surface quality
Unqualified quality level RQL
The packaging, marking, transportation and storage of cutting knives shall comply with the provisions of GB/T5305. riKAoNiKAca-
A1 Blade type (Figure A1)
Basic dimensions of blades (Table A1)
Specification code
QB/T 2350-1997
Appendix A
(Suggestive Appendix)
Blades of cutting knives
Figure A Blade type
Basic dimensions, mm
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