QB/T 1629-1992 Special grinding disc for disc refiner

This standard specifies the product classification, technical requirements, test methods and inspection rules, marking, packaging, transportation and storage of disc refiner discs (hereinafter referred to as "refiners"). This standard applies to refining discs with a diameter of 350 to 1370 mm, which are mainly used for refining paper raw materials and beating pulp. QB/T 1629-1992 Disc refiner discs QB/T1629-1992 Standard download decompression password: www.bzxz.net

Light Industry Standard of the People's Republic of China
Special disc refiner
Subject content and scope of application
QB/T 1629 -1992
This standard specifies the product classification, technical requirements, test methods and inspection rules, marking, packaging, transportation and storage of special disc refiners (hereinafter referred to as "refiners"). This standard applies to refining discs with a diameter of 350 to 1370 mm, which are mainly used for refining paper raw materials and beating pulp. 2 Reference standards
GB/T230 Metal Rockwell hardness test method
Batch inspection counting sampling procedure and sampling table (applicable to inspection of continuous batches)GB/T 2828
GB/T6388 Transport packaging delivery and receipt marks
GB/T14253 General technical conditions for light industrial machineryGBn193 General technical conditions for packaging of export machinery, electrical appliances, instruments and meters 3 Product classification
3.1 The basic dimensions of grinding discs are shown in Table 1.
Grinding disc nominal outer diameter, mm
350,450,550,600
600,650,750,800,850,900,950,1050,1200,1270,1300,1370
Grinding disc form
Multiple pieces
Note: For grinding discs with a diameter less than 400mm, the various indicators can refer to 350mm, and for 400~500mm, refer to 450mm. 3.2Material code
Grinding disc materials are divided into three types: ductile iron code Q, chilled cast iron code L, and special alloy steel code G. 3.3Model
The product model consists of four parts: industry code, name code, diameter specification and material code. Example: A ductile iron grinding disc with a diameter of 550 mm is marked as: MP 550
Material code
-Diameter specification
Grinding disc name code
Papermaking machinery industry code
Approved by the Ministry of Light Industry of the People's Republic of China on November 10, 1992 and implemented on July 1, 1993
4 Technical requirements
4.1 Basic requirements
QB/T 1629 -- 1992
4.1.1 Grinding discs shall comply with the requirements of this standard and be manufactured according to the drawings and technical documents approved by the prescribed procedures. 4.1.2 Grinding disc casting and machining shall comply with the relevant provisions of GB/T14253. 4.2 Material requirements
Grinding disc materials shall be smelted according to the prescribed formula, and their metallographic structure and hardness after heat treatment shall comply with the provisions of Table 2. Table 2
Note: White cast iron can be used as a reference.
4.3 Machining quality
Metallographic structure
Lower bainite + martensite
Cementite + pearlite
High carbon ledeburite
Martensite
Graphite steel
Hardness (tooth surface) HRC
The machining accuracy of the overall grinding wheel of ductile iron and chilled cast iron shall comply with the provisions of Table 3, and the machining accuracy of the special steel grinding wheel shall comply with the provisions of Table 4. Table 3
Inspection items
Parallelism, mm
Flatness, mm
Roughness R+μm
Static balance (ratio to self-weight)
Nominal outer diameter of grinding wheel, mm
0.08(—)
Whole grinding wheel
Flatness, mm
Total clearance, mm
Specification, mm
1/1000
Tooth surface roughness
Ratio of static balance to self-weight
≤1/1000
4.4 Appearance requirements
QB/T 1629—1992
4.4.1 The surface of the grinding wheel should be clean without any debris such as iron filings attached. 4.4.2 The tooth surface of the grinding disc shall be smooth and clean, without defects such as missing teeth, broken teeth, cracks, etc. 4.4.3 The assembly holes shall be flat, without defects such as shrinkage holes and cracks. 4.4.4 The tooth surface of cast iron grinding discs is allowed to have pores with a diameter and depth not exceeding 2mm. The number of pores for grinding discs with a diameter of less than 550mm shall not exceed 20, and the number of pores for grinding discs with a diameter of more than 550mm shall not exceed 40, and the number of pores shall not exceed 2 per square centimeter. 4.4.5 For special steel grinding discs, the tooth surface is allowed to have defects with a diameter and depth not exceeding 1.5mm, and the number of pores shall not exceed 20 per group, and the number of pores shall not exceed 2 per square centimeter.
4.5 Service life
4.5.1 Cast iron grinding discs are used for free beating of bleached rice and wheat straw pulp. Under the condition that the beating degree is increased by 8~10°SR (Schober's), the service life shall not be less than 700h. Used for free beating of bleached kraft pulp (needle), the service life shall be not less than 2500h under the condition that the beating degree increases by 10°SR (Schober's).
4.5.2 Special steel grinding discs are used for rough grinding of chemical thermomechanical pulp (CTMP), with a service life of not less than 1500h and a fine grinding service life of not less than 500h.
5 Test methods and inspection rules
5.1 Test methods
5.1.1 Metallographic structure analysis is carried out with a metallographic microscope. 5.1.2 Tooth surface hardness test is carried out in accordance with the relevant provisions of GB/T230. 5.1.3 Machining inspection is carried out with ordinary measuring tools as usual. 5.1.4 Moving disc grinding discs must be measured by static balancing instrument. 5.1.5 Appearance quality is inspected by visual inspection.
5.2 Inspection rules
5.2.1 Factory inspection
The grinding disc must be inspected and qualified by the inspection department of the manufacturer according to the requirements of 4.2, 4.3, and 4.4, and the product certificate must be issued before it can be shipped. 5.2.2 Type inspection
5.2.2.1 Type inspection should be carried out in any of the following situations. a.
When the new product is trial-made and identified;
After formal production, if there are major changes in structure, materials, processes, etc., which may affect product performance; b.
When the national quality supervision department makes a request. c.
5.2.2.2 Type inspection content includes:
All items of factory inspection;
Service life test.
5.2.2.3 Type inspection can be carried out at the user's factory, and it is allowed to use usage records as the basis. 5.3 Sampling plan
5.3.1 Sampling plan for factory inspection
5.3.1.1 A single sampling plan is adopted in accordance with GB/T2828. 5.3.1.2 The inspection level adopts the general inspection level IL=II. 5.3.1.3 The qualified quality level AQL=4.0. 5.3.1.4 The determination of the sampling plan and the judgment and processing of the qualified or unqualified inspection batches and the conversion of the strictness shall be carried out in accordance with the relevant provisions of GB/T2828.
5.3.2 Sampling plan for type inspection
A single sampling plan is adopted, and 2 sets are selected as samples each time. All of them must be qualified to be judged as qualified for type inspection. Samples should be randomly selected from a batch or several batches that have passed the factory 209
inspection. 5.4 Product quality grades and assessment methods
QB/T 1629—1992
5.4.1 The product quality grades of cast iron grinding discs and special steel grinding discs are divided into three grades: A, B and C. The grading indicators shall comply with the provisions of Table 5 and Table 6 respectively (A, B and C refer to superior grade, first grade and qualified grade). Table 5
Grading items
Parallelism between tooth surface and mounting surface
Tooth surface flatness
Tooth surface hardness HRC
Tooth surface roughness R.
Service life
For straw pulp according to 4.5.1
For rice pulp according to 4.5.1
Grading items
Flatness of tooth surface
Service life
5.4.2 Evaluation method
Hardness difference HRC of each block
Static balance (ratio to deadweight)
Rough grinding according to 4.5.2
Fine grinding according to 4.5.2
Measurement unit
Measurement unit
≤0.04()
≤0. 06(—)
≥1200
≥3500
≥1600
≥600
Grading index
≤0. 06()wwW.bzxz.Net
≤0.08(—)
≤0.08(-)
≤0.10(--)
≥1000
≥3000
Grading index
≥1500
≥550
≥700
≥2500
≥1400
After the batch product is judged to be qualified, the unit product is rated according to the lowest quality grade achieved in the inspection results, and the batch product is rated according to AQL=10.
6 Marking, packaging, transportation, storage
6.1 Marking
6.1.1 The mark should be cast directly on the back of the grinding disc. 6.1.2 The moving disc grinding disc of the block combination should be marked with the position sequence number at both ends of the fan-shaped arc on the back. 6.2 Packaging
Packaging shall be in accordance with the relevant provisions of GB/T14253, and can also be packaged according to user requirements, but export products shall be implemented in accordance with the relevant provisions of GBn193. 6.3 Transportation and storage
QB/T1629-1992
6.3.1 The transportation of grinding discs should be protected from impact and rain, and should comply with the provisions of GB/T6388. 2 The grinding discs should not be stored in the open air, and should not be piled together with corrosive chemicals. The storage place should be dry and ventilated. 6.3.2
Additional instructions:
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 Jilin Paper Mill and Sichuan Dayi Precision Casting Factory. The main drafters of this standard are Pu Zhenghui, Zheng Xuehong, Wang Jiayi, and He Shubai. 211
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