How to achieve zero burr O-rings?

Among all silicone rubber products, in addition to tires, the other is the O-ring (also called 0 ream). It has the basic characteristics of shock absorption, sealing and wear resistance. According to different materials, it can also have oil resistance, resistance to Chemical and other characteristics, often used in excavators, automobiles, instrumentation, construction machinery and other fields,

The most basic requirement to measure the quality of the sealing ring is: whether there is burr (flash), because only zero burr can ensure the sealing performance of the O-ring. Today we are going to talk about how the burr is generated and how to do it. Zero burr O-rings

Zero burr O-rings

The generation of burrs often occurs during molding and vulcanization. At this time, the rubber material will fill the cavity of the entire mold, and because the filled rubber material must have a sufficient amount, the excess rubber material will flow out along the parting surface at this time. Edges with different thicknesses of inner and outer diameters are called burrs,

There are two common trimming methods: manual trimming and mechanical trimming

1. Manual trimming

This method is the most primitive and traditional, that is, manually using a cutter to remove the burrs on the inner and outer edges of the ring. The quality of this trimming method depends on the experience of the workers, with low efficiency and high scrap rate, so it is only suitable for small batches of zero. Processing of burr O-rings

Zero burr seal

2. There are two types of mechanical trimming: grinding wheel edging and low temperature freezing

Compared with manual edging, grinding wheel and sandpaper edging has a corresponding increase in efficiency and quality. The specific method is to put the vulcanized O-ring on a sand rod or nylon rod with the same inner diameter, and use a motor to drive it. High-speed rotation, and then rubbing the outer circle of the O-ring with sandpaper or grinding wheel to achieve trimming, but the accuracy is not high, and the grinding surface is rough, which is the disadvantage of this trimming method.

The other is low-temperature freezing de-edging, which originated from Japan and is also a type of mechanical trimming. The difference is that it works in a freezing environment, which can be achieved by: vibration, swing or shaking, drum, brush grinding and shot blasting , five different forms to achieve zero burr O-rings,

The specific principle is that in a low-temperature freezing environment, the thin burrs of the O-ring change from an elastic state to a glassy state (hardens and becomes brittle) due to freezing, but the product itself still has a certain elasticity, and then with the operation of vibration (or other Five forms), the collision occurs between the product and the product, the product and the abrasive produce abrasion, and the product and the shot blasting produce impact. At this time, the thin burrs will be broken and then fall off, and finally the edge trim Afterwards, the product will restore its original performance at room temperature. This method has high production efficiency, but the edge removal effect on the inner ring is poor.

Well, the knowledge about the zero-burr O-ring is temporarily shared here. Manufacturers should choose one or more trimming methods reasonably according to their actual situation.

Founded in 1993, Hangzhou Biaozheng Rubber Plastic Fittings Factory is a professional enterprise engaged in the research, design and manufacture of rubber diaphragms.
As China Rolling Diaphragm Manufacturers and OEM Rolling Diaphragms Suppliers , The company not only has a complete set of rubber molding products such as kneading machine, open mill, filter machine, flat vulcanizing machine, etc., but also set up a mold processing and production center, which can customize various rubbers Diaphragm for customers.
The main products: rubber diaphragm obtained national patent in 1999, the service life of more than 200,0000 times. It has certain advantages in the development of special products such as silicone rubber, fluorine rubber, nitrile rubber, ethylene propylene rubber, butyl rubber and other products resistant to nuclear radiation, high temperature resistant oil, high temperature resistant steam and various chemical media.