Suitable amending the law of the rubber O-ring

 

Unvulcanized rubber O-ring compound as a viscous fluid, and the compression molded and cured stage, plastic materials quickly to fill the cavity at a high temperature, pressure, the excess part (in order to prevent lack of glue, filling in the cavity of the rubber material, certainly to maintain a certain excess) overflow vulcanization, they formed the excess glue (also known as scrap, flash). Overflow edge once formed, to make the appearance neat and beautiful, must be removed, this process commonly known as trimming. For trimming the size requirement is precise, neat appearance. In the actual production. Trimming products are often time-consuming, consuming work, strict requirements for the product, when trimming a slight mistake which may waste time and must be treated with caution. Generally speaking, the smaller the size of the product specifications, the more complex configurations, the higher the difficulty of trimming, the more waste.

 

Trimming the rubber O-ring is divided into manual, mechanical refrigeration and other categories:

 

1. Hand trimming. The operator holds the tool along the outer edge of the product, will repair to the overflow edge gradually. This is the most primitive way. Inefficient, difficult to guarantee quality, especially for the smaller size, high precision rubber O-ring is difficult to do a thorough, on the net, and it is easy to damage the product and the connecting portion of the body and the overflow edge. Often left teeth marks, nicks, leaving oil spills, leaks and other problems affecting sealing aftermath. Also. Rubber O-ring manual trimming operation proficiency depends also very prominent.

 

2. Frozen trimming. The vulcanized together with good product waste side, except side performed under freezing conditions. The technology was developed by Japan's Showa carbonate and domestic Zhaoling Precision co-invented improvements for decades, with the freezing medium of choice, updating and improvement of mechanical movement, frozen trimming also experienced several improvements, maturity and perfection work efficiency and processing quality has been noticeably improved.

 

3. Mechanical trimming. In order to improve efficiency and quality, it has a mechanical trimming. Common with dedicated electric rotary blade trimmer. Match the height of the blade used and required product size. If the inner and outer edges of the product have overflow edge. It can be designed to be double-edged, more cutting edge. In order to achieve a complete. Mechanical trimming processing accuracy than manual trimming, efficiency has improved several times, especially in a multi-cavity mold for the product concerned, in accordance with the arrangement and distribution of the product, designed to match the tool. Products to be out of the mold after. You can put full-page, once punching. Under heating with, one can repair dozens. The key is the punching temperature must be controlled, prevent the excessive adhesion.

 

Rubber O-ring low hardness, easy to install, but prone to peeling, installation damage, extrusion pressure even explode. High hardness, inconvenient to install.

 

Usually rubber O-ring hardness 40 ~ 90 IRHD, but in general the use of 70 IRHD is more appropriate for the silicone rubber is the exception, generally use 60 IRHD.