GB/T 27553.1-2011 PDF EnglishUS$150.00 · In stock · Download in 9 seconds
GB/T 27553.1-2011: Specification of plastics-bronze-steel backing triple-layer self-lubricating materials - Part 1: Plastic overlay with modified PTFE Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid
Similar standardsGB/T 27553.1-2011: Specification of plastics-bronze-steel backing triple-layer self-lubricating materials - Part 1: Plastic overlay with modified PTFE---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT27553.1-2011 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 21.100.10 J 12 Specification of plastics-bronze-steel backing triple-layer self-lubricating materials - Part 1. Plastic overlay with modified PTFE Issued on: NOVEMBER 21, 2011 Implemented on: JUNE 1, 2012 Issued by. General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration Committee. Table of ContentsForeword ... 3 1 Scope ... 4 2 Normative references ... 4 3 Structural features ... 5 4 Technical requirements ... 6 5 Test methods ... 7ForewordGB/T 27553 "Specification of plastics-bronze-steel backing triple-layer self- lubricating materials" consists of two parts. - Part 1. Plastic overlay with modified PTFE; - Part 2. Plastic overlay with modified POM. This Part is Part 1 of GB/T 27553. This Part was drafted in accordance with the rules given in GB/T 1.1-2009. This Part was proposed by China Machinery Industry Federation. This Part shall be under the jurisdiction of National Technical Committee on Sliding Bearing of Standardization Administration of China (SAC/TC 236). Main drafting organizations of this Part. China Machine Productivity Promotion Center, Zhejiang Shuangfei Oilless Bearing Co., Ltd. The drafting organizations of this Part. Zhejiang Changsheng Sliding Bearing Co., Ltd., Zhejiang Zhongda Bearing Co., Ltd., Beijing Chaoyang Jianhua Oil- free Lubricating Bearing Factory, Liaoyuan Steel Bearing Co., Ltd. Specification of plastics-bronze-steel backing triple-layer self-lubricating materials - Part 1. Plastic overlay with modified PTFE1 ScopeThis Part of GB/T 27553 specifies the structural features, technical requirements, test methods for plastics(with modified PTFE)-bronze-steel backing triple-layer self-lubricating materials. This Part of GB/T 27553 applies to plastics(with modified PTFE)-bronze-steel backing triple-layer self-lubricating materials (hereinafter referred to as the plate). The plate can be processed into a product of a rolled sleeve, a thrust washer, a slider, a guide rail, etc.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 223.69, Iron, Steel and Alloy-Determination of Carbon Contents - Gas- volumetric Method after Combustion in the Pipe Furnace GB/T 231.1, Metallic materials - Brinell hardness test - Part 1. Test method (GB/T 231.1-2009, ISO 6506-1.2005, MOD) GB/T 3960, Plastics - Test method for friction and wear by sliding GB/T 5121.2, Copper and copper alloys - Determination of phosphorus content (GB/T 5121.2-2008, ISO 4741.1984, MOD) GB/T 5121.10, Methods for chemical analysis of copper and copper alloys - Part 10. Determination of tin content (GB/T 5121.10-2008, ISO 3111.1975, MOD) GB/T 5121.11, Methods for chemical analysis of copper and copper alloys - Part 11. Determination of zinc content (GB/T 5121.11-2008, ISO 4740.1985, MOD) intermediate sintered layer is greater than 2N/mm2. 4.4.2 The bond of the intermediate sintered layer and the steel backing layer shall be tested in accordance with the method of 5.6.2, bent 5 times, cracks not allowed, no delamination or peeling. 4.5 Appearance quality The surface plastic layer is visually free of wrinkles, lack of material, cracks, blisters, inclusions and other defects. The surface of the steel backing layer is free of defects such as black spots, rust spots, etc., and scratches that affect the use. 4.6 Thickness and limit deviation See Table 4 for thickness and limit deviation. Table 4 -- Thickness T and limit deviation mm Thickness range 0.75≤T≤1.5 1.5< T≤2.5 Limit deviation ±0.012 ±0.0155 Test methods5.1 Chemical composition analysis The carbon content of the steel backing is determined according to the method specified in GB/T 223.69. The chemical composition of the intermediate sintered layer is determined according to the method specified in GB/T 5121.2, GB/T 5121.10, GB/T 5121.11. 5.2 Thickness test of each layer 5.2.1 Thickness test of surface plastic layer Take a plate of 37mm x 37mm. Measure 3 times at the center of the plate with a wall thickness micrometer. Take the arithmetic mean. Then completely remove the plastic layer in the center of the plate according to 5.6.1 or other methods. Then use a wall thickness micrometer to measure 3 times in the center of the plate. Take the arithmetic mean. The difference in size before and after the removal of the surface plastic layer shall be the thickness of the surface plastic layer. 5.2.2 Thickness test of intermediate sintered layer Perform the test according to the provisions of GB/T 6642. Measure the thickest point in a field of view at a magnification of 70. a) the temperature reaches the limit specified by the test; b) the friction factor exceeds limit. Print out the friction factor and temperature curve over time by computer. 5.5.1.6 Friction and wear measurement method Before the start of the test, use a wall thickness micrometer to measure more than 4 points in the shaded area shown in Figure 3. Take the arithmetic mean. The difference between the wall thickness before and after wear is the amount of wear. 5.5.2 Ring friction and wear test In addition to the following ones, the test method for ring friction and wear shall meet the requirements of GB/T 3960. 5.5.2.1 Specimen thickness The specimen thickness is 2.0mm. 5.5.2.2 Specimen fixture Sample fixture groove depth is reduced by 2mm in standard fixture. 5.5.2.3 Load The test load of specimen is 196N. 5.5.2.4 Lubrication conditions Lubrication conditions for ring friction test have two forms. dry friction and oil lubrication. Dry friction refers to the fact that the specimen does not contain any lubricant or grease during assembly and during testing. Oil lubrication means that at the start of the test, 5 drops of No. 32 mechanical oil shall be dropped on the outer diameter of the steel wheel. 5.5.2.5 Friction torque The friction torque value is based on the average value recorded in the second hour. If fluctuations occur, the maximum and minimum values in the second hour shall be recorded. Usually use A+B two hammers and 500N·cm ruler. In the oil lubrication test, an A weight and a 100N·cm ruler are used. 5.6 Bond strength test 5.6.1 Bond strength of surface plastic layer and intermediate sintered layer ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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