The ejector pin is an important mold accessory, and its quality is determined by its material. So, what kind of material is usually used for the ejector pin of the mold?

The die thimble is generally made of high speed steel, which needs heat treatment later. At present, there are many brands, such as SKD61 and SKH51. Its hardness is 50-55 degrees. It is surface hardened and nitrided. In addition, there is a kind of thimble made of ordinary high speed steel, which is used in places with low requirements The market price of thimble varies greatly, and the price of famous manufacturers is relatively high. The mould thimble provided by Dongguan Xiongjing Hardware is a model of good quality and low price.

The die thimble is easy to break during die stamping. What is the reason? Zhuochang mold accessories analyze for you

The broken needle must be caused by too much resistance during stamping, which exceeds the tolerance limit of the die thimble. First, check whether the hardware is strained or deformed, and properly improve the die inclination; If there is still no improvement, it should be changed from the die thimble, such as increasing the diameter of the die thimble, or using better material SKD61 for heat treatment of the die thimble. And whether the process can be improved.

In fact, the ejector sleeve is just a kind of thimble. It's just that when making the mold, a relatively deep column needs to be designed. I'm afraid that it will not be ejected when it is ejected. (The position is not enough to design a general thimble), you can use the ejector sleeve to solve this problem. Among them, the ejector sleeve can move in the mold as well as the thimble, and there is a small needle in the middle of the ejector sleeve, which is called the ejector sleeve. It is stationary and is usually fixed on the bottom plate. Generally, the ejector sleeve has a lower PL surface than the mold.