JB/T 2985-2001 This standard is a revision of JB/T 2985-1993 "Bimetallic Bushings for Construction Machinery". During the revision, the chemical composition of the alloy layer was modified; the detection of the thickness of the alloy layer was added; and the specifications and models of the products were expanded. This standard specifies the technical requirements, test methods, inspection rules, packaging and transportation of bimetallic bushings for crawler-type construction machinery. This standard applies to bimetallic bushings for supporting wheels, guide wheels and other transmission parts of the traveling mechanisms of crawler bulldozers, excavators, loaders, etc. This standard was first issued in July 1987, revised for the first time in 1993, and this is the second revision. JB/T 2985-2001 Bimetallic Bushings for Construction Machinery JB/T2985-2001 Standard download decompression password: www.bzxz.net
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ICS53.100 Machinery Industry Standard of the People's Republic of China JB/T2985—2001 Bimetallic Bushings for Construction Machinery Constructionmachinery-Bi-metalcollar2001-03-04 Issued China Machinery Industry Federation 2001-10-01 Implementation JB/T2985—2001 This standard is a revision of JB/T29851993 "Bimetallic Bushings for Construction Machinery". Compared with JB/T29851993, the main technical content of this standard has been changed as follows: The chemical composition of the alloy layer of the shaft sleeve has been modified, and the sum of impurities such as zinc, iron, and nickel is ≤1.0%. The thickness of the alloy layer has been tested; - Expanded product specifications and models This standard will replace JB/T2985-1993 from the date of implementation. This standard was proposed and managed by the Mechanical Industry Engineering Machinery Standardization Technical Committee. The drafting units of this standard are: Tianjin Engineering Machinery Research Institute, Baoding Jizhong Bearing Factory. The main drafters of this standard are: Yang Chengshan, Men Baojian. This standard was first issued in July 1986, revised for the first time in 1993, and this is the second revision. 1 Scope Machinery Industry Standard of the People's Republic of China Bi-metal collar for construction machinery Construction madhinary Bi-metal collar JB/T2985—2001 Replaces JBT29851993 This standard specifies the technical requirements, test methods, inspection rules, packaging and transportation of bi-metal collars for crawler construction machinery. This standard applies to bi-metal collars (hereinafter referred to as collars) for supporting wheels, guide wheels and other transmission parts of the traveling mechanisms of crawler pushers, excavators, loaders, etc. 2 Referenced standards The provisions contained in the following standards constitute the provisions of this standard by being referenced in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and the parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T 6991999 GB/T1958—1980 GB/T2828—1987 GB/T3850—1983 GB/T126131990 JB/T7925.2—1995 3 Classification and naming High-quality carbon structural steel Provisions for shape and position tolerance inspection Counting sampling procedures and sampling tables for batch inspection (applicable to inspection of continuous batches) Density determination method of dense sintered metal materials and cemented carbides Sliding bearings, rolled sleeves Sliding bearings Multi-layer bearings Anti-friction alloy hardness test method Sleeves are classified and named according to the production process of the alloy layer, see Table 1. Table 1 Sintering process Centrifugal casting process 3.2 Marking method 3.2.1 The sleeve marking consists of the following parts China Machinery Industry Federation 2001-03-04 Approval name Sintered sleeve Cast sleeve Standard number Process code Sleeve length, mm Inner diameter, Process code 1 Implementation 3.2.2 Marking example JB/T2985-2001 The bimetallic sleeve of centrifugal casting process with A-type structure, inner diameter 60mm and sleeve length 90mm is marked as: sleeve A60X90LJB/T2985—2001 4 Technical requirements 4.1 The product shall be manufactured according to the drawings and technical documents approved by the prescribed procedures and shall comply with the provisions of this standard. 4.2 Materials 4.2.1 Steel layer 4.2.1.1 The steel layer of the bimetallic sleeve of the casting process shall be 08F, 08, 10, 15 steel specified in GB/T699—1999. 4.2.1.2 For the bimetallic sleeves made by sintering process, the steel layer shall be 08, 10, 08F steel and 08AL steel specified in GB/T699-1999. Hot-rolled steel strip or steel plate shall be used for sintered coiled sleeves with a wall thickness greater than or equal to 3.5 mm; cold-rolled steel strip or steel plate shall be used for sintered coiled sleeves with a wall thickness less than 3.5 mm. 4.2.1.3 The hardness of the steel layer shall be 125~200HB. 4.2.2 Alloy layer 4.2.2.1 The grade and chemical composition of the sleeve alloy layer shall comply with the provisions of Table 2. Table 2 Sleeve alloy layer grade CuPb10Snl0 GuSn7Pb7Zn3 The hardness and density of the sleeve alloy layer shall comply with the provisions of Table 3. Table 3 Alloy layer grades of shaft sleeves CuPb10Sn10 CuSn7Pb7Zn3 Note: CuPb10Sn10 material is preferred Hardness HB 70~130 Density g/mm2 4.2.2.3The metallographic structure of the shaft sleeve alloy layer shall be above Grade 2 in the metallographic picture in Appendix A (Appendix of the Standard). 4.3The main dimensions of the shaft sleeve shall comply with the provisions of Figure 1 (Type A), Figure 2 (Type B) and Table 4 (Type A), Table 5 (Type B) or the provisions of the relevant drawings. JB/T2985—2001 4.4The geometric tolerances and surface roughness of the shaft sleeve (including the bimetallic shaft sleeve without thrust edge) shall comply with the provisions of Figure 1 or Figure 2. 8A Figure 1A-type shaft sleeve Figure 2B-type shaft sleeve Table 4A-type shaft sleeve JB/T2985-2001 B-type shaft sleeve 4.5The alloy layer of the shaft sleeve shall be firmly bonded to the steel layer, and the bonding strength between the steel layer and the alloy layer shall not be less than 88MPa. mm 4.6The thickness of the shaft sleeve alloy layer is 0.7mm±0.2mm, and the difference between the maximum and minimum values of the alloy layer thickness on the same shaft sleeve shall not exceed 0.25mm 4.7The joint of the sintered shaft sleeve adopts a straight seam or buckle type, and a punching fillet is allowed at the joint. 4.8The alloy layer of the shaft sleeve shall be dense, without defects such as cracks, pinholes, rust and foreign inclusions, and the inner surface shall be smooth, without scratches, bumps and indentations. There shall be no welding pit defects on the surface of the steel layer. 4.9 5Test method The chemical composition of the sleeve alloy layer shall be tested by spectrophotometer or titration. The hardness test of the sleeve alloy layer shall be carried out in accordance with the provisions of JB/T7925.2. The metallographic structure of the sleeve alloy layer shall be tested by metallographic microscope. 5.4 The inspection of the density of the sintering process sleeve alloy layer shall be in accordance with the provisions of GB/T3850. The inspection of the outer diameter and inner diameter of the sintered and rolled sleeve shall be in accordance with the provisions of GB/T12613. 5.5bZxz.net 5.6The thickness of the sleeve alloy layer shall be measured on the radial section of the sleeve by a non-magnetic thickness gauge, and the position of the section shall be in accordance with the provisions of GB/T12613. 5.7The shape and position tolerance of the sleeve shall be inspected in accordance with the GB/T1958 inspection method. 5.8 Bonding test between the steel layer and the alloy layer of the sleeve 5.8.1 Nondestructive test Mainly by listening. When tapping the steel layer of the sleeve, the sound should be crisp and loud, and there should be no mute sound. 5.8.2 Destructive test 5.8.2.1 Bending method First, unfold the sleeve and flatten it, then continue to press it to 90°, and then return to flattening. The alloy layer is allowed to have cracks, but the alloy layer is not allowed to separate from the steel layer. 2 Determination of bonding strength The test specimen and device are shown in Figures 3 and 4. 4 JB/T2985—2001 The determination of the bonding strength of the bimetallic sleeve should be carried out on a 5~20kN universal material testing machine. During the test, the load is applied to the sample steadily and slowly, with a stress increase of 10N/(mm2·s), until the alloy layer is torn or torn off from the steel layer. At this time, the value indicated on the dynamometer of the testing machine is the maximum test load, and the bonding strength of the bimetallic sleeve is calculated according to the following formula. At the same time, the test conditions, damaged parts, damage forms and manufacturing defects should be recorded. In the formula: Reh bonding strength, MPa; maximum test load, N A total bonding area, mm. 6 Inspection rules 6.1 Factory inspection Each sleeve must be inspected and qualified by the inspection department of the manufacturer before it can be shipped. The inspection items include inner diameter, outer diameter, thrust ring thickness and alloy layer thickness, alloy layer thickness difference, surface roughness, and surface quality. The chemical composition and metallographic structure of the alloy layer shall be sampled and inspected in accordance with the provisions of 5.2. Type inspection JB/T2985-—2001 The items for type inspection of bimetallic sleeves shall be in accordance with the provisions of Table 6. Sampling inspection shall be carried out in accordance with the provisions of GB/T2828, and a single sampling plan shall be adopted. Under normal circumstances, the inspection batch N is 51~90, and the inspection level and qualified quality level (AQL) shall be in accordance with the provisions of Table 6, or determined by negotiation between the supply and demand parties. During the inspection, if the number of unqualified items for each item is equal to or less than the corresponding qualified judgment number (Ac), the batch of products shall be accepted, otherwise it shall be rejected. Table 6 Inspection items Thickness of thrust ring Chemical composition of alloy layer Adhesion strength of alloy layer Metallographic structure of alloy layer Thickness of alloy layer Thickness difference of alloy layer Other shapes and dimensions Geometric tolerance Surface roughness Surface quality 7 Marking, packaging, transportation and storage 7.1 Each sleeve shall be marked with the manufacturer’s mark, product model and standard number. AQL Inspection Level General Inspection Level ⅡI Special Inspection Level S-2 General Inspection Level ⅢI 7.2 Each sleeve must be cleaned and treated with corrosion protection before packaging, and wrapped with strong and impermeable neutral paper or plastic film before being packed into a packaging box. Each box should contain sleeves of the same size and of the same model. 7.3 The outer surface of the packaging box should be marked with: a) Manufacturer's name, zip code, address and telephone number; b) Product name and product specifications: c) Quantity and quality: d) Packing date. 7.4 Each packaging box should be accompanied by a certificate signed by the inspector of the manufacturer's quality inspection department. 7.5 The sleeves packed in the packaging box should be placed in a dry packaging box lined with waterproof paper. The box should have protective fillings to ensure that the parts will not be damaged during normal transportation. 7.6 The outer surface of the packing box should be marked with: a) Manufacturer's name and address; b) Product name, product specifications; Quantity and total weight; d) "Handle with care", "Moisture-proof", "Pressure-proof" and other signs; 6 e) Packing date. JB/T2985—2001 7.7 The packed sleeves should be stored in a ventilated and dry warehouse. Under normal storage conditions, the manufacturer should ensure that the sleeves are free of rust within 12 months from the date of leaving the factory. Figure A11 level JB/T2985—2001 Appendix A (Appendix to the standard) Metallographic diagram of alloy layer (×100) Figure A33 level Figure A22 level Mechanical industry standard Bimetallic bushings for engineering machinery JB/T2985-2001 Published and issued by the Mechanical Science Research Institute Printed by the Mechanical Science Research Institute| |tt||(No. 2, Shouti South Road, Beijing, Postal Code 100044)* Book size 880×12301/16 Printing sheet 3/4 4 Word count 18000 First printing in August 2001 Edition in August 2001 Print run 1-500 Price 1200 yuan 2001-016 Mechanical Industry Standard Service Network: http/wwwJB.ac.cn1002862 Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.