Problems with rollers produced by domestic manufacturers
1. Many steel grades do not meet the standards, and the heat treatment process does not work well.
2. Vicious competition in the market, cutting corners on several important structures of the product, such as the reduction of the diameter of the wheel body, the thinning of the spindle, the shortening of the length of the copper sleeve, etc.
The roundness of the wheel body The reduction in diameter causes the linear speed of the wheel to increase, and the shaft sleeve bears more friction. The same principle applies to the thinning of the fulcrum. It will also not be strong enough to withstand the impact, causing the shaft to deform or break. The copper sleeve plays a role of friction. The copper layer must be rolled and not easy to fall off. The normal copper layer must be above 0.35mm to meet the standard. Reducing the length of the copper sleeve will lose the meaning of the roller. Reducing the length is equivalent to reducing the force. area.
So to solve these shortcomings of products, domestic products have great advantages over foreign products.