What are the disadvantages of making special-shaped springs?

What are the production defects of special-shaped springs?

There are five major shopping malls in the domestic market that have a greater demand for special-shaped spring products: transportation, daily hardware, instruments and electrical appliances, industrial and mining accessories, and overseas export markets. Tension springs, the shopping mall with the strongest pulling power in the transportation market, including support springs professionally supplied and repaired for automobiles, motorcycles, diesel engines and railways, this is the most important and promising shopping mall for spring business, with sales of nearly 60 % of the industry's 2013 suspension springs require 10,000,000 pieces, and the total sales in the spring of 2013 for professional support and supply of spare parts exceed 100,000,000 yuan.

In recent years, my country's automobile industry has entered rapid growth, with the annual growth rate remaining at 15% and 25%, which will increase the demand for special-shaped springs, and special-shaped spring manufacturers will be a good development opportunity.

However, due to the process content of producing special-shaped springs in addition to flanging and narrow bending surfaces, coupled with the special complexity of the workpiece and the content of the shape formation, the mold core material and the forming surface must be consistent with the molding requirements, which will lead to structural conditions of the mold forming stroke. , the pressing area is small. Designers will consider the shape characteristics of the spring, but ignore the pressure core to form a guide slide, but this often produces some defects:

1. Because the pressure core is a complex surface, it is used in the casting process, causing the gap between the machined surface and the surface of the concave mold to slide and exist. In the normal operation of the mold, the pressure core swings left/right.

The formation height of double special-shaped springs is up to 100 mm. It is necessary to design a special guide plate. It cannot be guided by the sliding band gap between the machined surface and the side wall of the die. The friction caused by the slope has a very poor effect, and the lateral force cannot be effectively eliminated. , large-scale production will lead to an increase in the gap, lead to normal lead effects, and cause malignant quality accidents.

3. The lead length of the press core is designed to be 125 mm, and the actual length direction is 100 mm, which is within the design range. However, there are some movements that remain 110 mm and 9 mm long and exceed the effective guide, which is unstable in pressing upward and positioning parts. Defects.