In the structure of plastic molds, springs are often used to drive related mechanisms. There are various spring specifications, such as round wire springs, rectangular springs, disc springs, etc.
Most of the mold parts are made of steel, with a certain weight, and those with small elasticity are difficult to drive, so they are often composed of rectangular springs. Rectangular springs are subdivided into various categories according to elastic requirements, and the industry is usually classified by color. Among them, the yellow spring is the most commonly used in plastic molds, such as the reset on the row position and the reset of the thimble plate. When the structure on the mold is too large or too large, a more elastic force is required, or some templates have higher mold opening sequence requirements, you can consider choosing a blue spring with better elasticity, or even a higher-level red spring.
Yellow springs belong to the category of light and small loads and are the most widely used in plastic molds. First, select the appropriate size spring (outer diameter D) according to the mold structure. If there is a column passing through the middle of the spring, you need to pay attention to the inner diameter of the spring (d). The inner diameter of the yellow spring is a little larger than half of the outer diameter, and the outer diameter of the passing column cannot be It is larger than the inner diameter of the spring, otherwise, it will not fit in. Secondly, choose different spring compression ratios, and the life of springs with different compression ratios is different.
The blue spring belongs to the category of light load, and it is also widely used in plastic molds. The usage is similar to the yellow spring, but note that the inner diameter of the blue spring is smaller than that of the yellow spring, which is half the outer diameter. The kill length is also longer than the yellow spring of the same specification, and the blue spring usually uses a compression ratio of 30% to 40%.
The red spring belongs to the category of medium load and is rarely used in plastic molds. The usage is similar to the yellow spring, the inner diameter of the red spring is the same as that of the blue spring, which is half the outer diameter. The kill length is also longer than the blue spring of the same specification, and the red spring usually uses a compression ratio of 25% to 30%.