o-rings are need to strictly control the quality and appearance, because its function for sealing, small plastic edge is likely to affect the whole sealing performance, so after vulcanization of finished product is needed trimming processing, to remove these extra rubber edge, this process is called the trimming.
But in general the smaller the size, the more complex configuration, the higher the difficulty, the more time consuming work.
Moulded rubber seals
o-rings trimming method has two kinds: namely, manual and mechanical beveling.
Manual trimming is the most traditional trimming method, through the artificial use tool along the product gradually excess glue to the outer edge of the trim.
Need high proficiency will reduce the scrap rate of the product.
Manual trimming investment small, trimming quality is not high efficiency is low, only applicable to small batch processing of the product.
Mechanical trimming method has two kinds, one kind is a grinding wheel abrasive grinding, the other is a low temperature freezing to edge.
At present, the low temperature freezing method has vibration frozen beveling, swing or jitter frozen trimming, drum frozen trimming, brush grinding freezing and blast freezing beveling five forms.
Put O rubber ring in the frozen trimming machine, under the control of low temperature products of thin plastic edge since frozen and harden brittle, but the product itself will still maintain a degree of elasticity, with drum operation, the collision between products, products with shot blasting and abrasive impact, abrasion, rubber edge will be broken off, achieve the goal of trimming.
Products will restore the original performance at room temperature.
Every enterprise need according to their own actual situation, combined with the size of products is to reasonably choose a way of trimming, flexible to choose in order to better to perfect products and reduce scrap, improve business efficiency.
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