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Inspection standards for rubber products
Release time:
2023-08-03 15:28
Source:
1、Appearance inspection
Appearance inspection is carried out for the first mold parts of each working shift of vulcanization process, while 100% of the parts are inspected for appearance for acceptance of finished products.
Appearance inspection method generally adopts visual inspection method.
When checking the finish of the working surface of the parts, generally take the finish specified on the drawing of the mold as the standard.
2, size inspection
Vulcanization process for the first mold inspection; acceptance of the finished product is generally sampling, but the size of the parts required for strict requirements or parts need to be machined as well as the need to stabilize the parts in the working medium, in principle, the main size should be 100% inspection.
After vulcanization and removal of burrs parts need to be parked for 6 hours before size inspection. Rubber parts elastic deformation is large, if the measurement method or gauge selection is not appropriate, will affect the accuracy of measurement. General trial mold identification and trial production should be selected with general-purpose gauges and instruments, and batch production is the choice of special gauges.
3, performance test
(a) Sauer A hardness test, the thickness of the specimen should not be less than 6mm, the width is not less than 15mm, the length is not less than 40mm. such as the thickness does not meet the requirements, can be used to overlap the same specimen to determine, but not allowed to more than four layers and to be parallel to the bottom of the top.
(b) oil swelling test, the specimen will be immersed in oil, acid, alkali or other liquid media, at the specified temperature after a certain period of time to measure the size, volume or weight changes.
(c) rubber-metal bonding strength test, sectional method, generally with ?3 of the steel needle picking the rubber on the metal parts, if the rubber picking and breakage of the metal parts after the surface of the rubber bonding traces of uniformity, it is considered that the adhesive strength of the bonding strength is qualified. For each working class of parts generally in the first mold inspection and acceptance of finished products 1-3 pieces each to do bonding strength test.
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