JB/T 6638-1993 Specifications for glass fiber reinforced polyamide 66 for rolling bearing cages JB/T6638-1993 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T 6638-1993
Glass Fiber Reinforced Polyamide 66 for Rolling Bearing Cage
Technical Conditions
Published on 1993-05-07
Ministry of Machinery Industry of the People's Republic of China
Implemented on 1994-01-01
Mechanical Industry Standard of the People's Republic of China
Glass Fiber Reinforced Polyamide 66 for Rolling Bearing Cage
Technical Conditions
Subject Content and Scope of Application
JB/T6638-1993
This standard specifies the technical inspection methods and inspection rules for glass fiber reinforced polyamide 66-25 (hereinafter referred to as GRPA66-25) for rolling bearing cages.
This standard applies to the production inspection and user acceptance of GRPA66-25 for rolling bearing cages. 2
Cited standards
GB1033
GB1034
GB1036
GB1039
GB1040
GB1043
GB1634
GB 2547
GB2577
GB3398
GB4608
GB7141
GB9341
HG1122
Technical requirements
Test method for density and relative density of plastics
Test method for water absorption of plastics
Test method for linear expansion coefficient of plastics
General rules for test methods for mechanical properties of plastics
Test method for tensile strength of plastics||t t||Test method for impact of simply supported beam of plastics
Test method for heat deformation temperature of plastics
Sampling method for plastic resin
Test method for resin content of glass fiber reinforced plastics
Test method for hardness of plastic by ball indentation
Test method for melting point of partially crystalline polymersOptical methodTest method for hot air aging of plastics
Test method for bending properties of plastics
Injection preparation method for thermoplastic plastic specimens
The technical requirements of GRPA66-25 shall be as specified in Table 1. Table 1
Density g/cm
Melting point ℃
Water absorption %
Approved by the Ministry of Machinery Industry on May 7, 1993
Fine particles, no obvious color difference, no burnt particles
1.32~1.41
≥255www.bzxz.net
Implemented on January 1, 1994
Inspection method
Glass fiber content %
Molding shrinkage|| tt||Tensile strength MPa
Impact strength kJ/m2
Notched impact strength kJ/m2
Ball indentation hardness
Flexural modulus
Heat deformation temperature (1.8MPa)
Linear expansion coefficient
Preparation of sample
10-/℃
Tensile strength
b.Impact strength kJ/m2
JB/T 6638-1993
Continued Table 1
c.Notched impact strength
The samples required for the measured items are prepared in accordance with HC1122. Sample state adjustment and test environment
≥150
≥200
≥110
Impact strength, notched impact strength and flexural elastic modulus The state adjustment of the sample and the tensile strength after room temperature and heat aging test and the test environment refer to the provisions of GB1039.
4.2.1 The test is carried out in a dry state. The dry state refers to the state in which the sample is placed in a dryer for more than 24 hours immediately after injection molding or after heat aging test.
If the sample absorbs moisture due to exposure to the air, it needs to be dried. The drying conditions are: medium air temperature 100~110℃C, time 6h. The dried sample should be immediately placed in a dryer for more than 24 hours before testing. 4.2.3
Test environment: temperature 25±2℃:
Relative humidity (65±5)%.
Test items
Appearance:
Visual inspection.
Density:
Measured in accordance with GB1033.
Melting point: 3
Measured in accordance with GB4608.
Water absorption: Measured in accordance with GB1034.
Glass fiber content: Measured in accordance with GB2577. Tensile strength: Measured in accordance with GB1040. Impact strength and notched impact strength: Measured in accordance with GB31043
Ball indentation hardness: Measured in accordance with GB3398, flexural elastic modulus: Measured in accordance with GB9341. 4.3.10
JB/T6638-1993
Heat deformation temperature: Measured in accordance with GB1634. Linear expansion coefficient: Measured in accordance with GB1036. 4.3.11
4.3.12 Heat aging resistance: Determine according to GB7141. Test conditions: medium air temperature 180±2℃: time 200h. After the heat aging test, the tensile strength, impact strength and notched impact strength are measured according to GB1040 and GB1043 respectively. 5
Inspection rules
5.1GRPA66-25 should be inspected by the quality inspection department of the manufacturer. 5.2 Material sampling shall be in accordance with GB2547.
5.2.1 Every 5t of material is a batch.
5.2.2 The sampling quantity shall be twice the required quantity of the measured item, one for testing and one for storage in a sealed and clean container for arbitration. Each sample shall be marked with the product name, brand, batch number, production date, sampling date, etc. 5.3 Determination of unqualified products
If one of the test results fails to meet the indicators specified in the technical requirements, two times the number of samples should be re-selected for re-testing of the items that fail to meet the indicators. If the re-test results still fail to meet the standards, the batch of materials will be treated as unqualified products. Packaging, marking, transportation, storage
1 The materials should be packed in plastic packaging bags lined with polyethylene film or 3-layer kraft paper packaging bags, with a net weight of 25kg per bag. 6.1
6.2 The packaging bag should be marked with the material name, brand, batch number, production date, manufacturer, net weight, etc., and the bag should be accompanied by a product certificate. The materials should be moisture-proof and waterproof during transportation and the packaging should be protected from damage: they should be stored in a clean, ventilated, dry warehouse away from heat sources. 6.3
Additional instructions:
This standard was proposed by the National Technical Committee for Standardization of Rolling Bearings and is under the jurisdiction of the Luoyang Bearing Research Institute of the Ministry of Machinery Industry. This standard was jointly drafted by Luoyang Bearing Research Institute and Suzhou Plastics Research Institute of the Ministry of Machinery Industry. The drafters of this standard are Liu Yaying, Cai Genxi, Wei Dun, Ding Changkai and Zhou Guozhong. 3
People's Republic of China
Mechanical Industry Standard
Glass fiber reinforced polyamide 66 for rolling bearing cage
Technical Conditions
JB/T6638-1993
Published and issued by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2 Shouti South Road, Beijing
Postal Code 100044)
Format 880×12301/16
Sheet 1/2Number of words 6,000
First edition in October 1993
First printing in October 1993
Print run 1-500
Price 2.00 Yuan
Mechanical Industry Standard Service Network: http://www.JB.ac.cn61_899
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