Skip to product information
1 of 6

PayPal, credit cards. Download editable-PDF and invoice in 1 second!

GB/T 27553.1-2011 English PDF (GBT27553.1-2011)

GB/T 27553.1-2011 English PDF (GBT27553.1-2011)

Regular price $145.00 USD
Regular price Sale price $145.00 USD
Sale Sold out
Shipping calculated at checkout.
Quotation: In 1-minute, 24-hr self-service. Click here GB/T 27553.1-2011 to get it for Purchase Approval, Bank TT...

GB/T 27553.1-2011: Specification of plastics-bronze-steel backing triple layer self-lubricating materials -- Part 1: Plastic overlay with modified PTFE

This 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.
GB/T 27553.1-2011
GB
NATIONAL STANDARD OF THE
PEOPLE 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 Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Structural features ... 5
4 Technical requirements ... 6
5 Test methods ... 7
Foreword
GB/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 PTFE
1 Scope
This 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 references
The 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 ??0.015
5 Test methods
5.1 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

View full details