Ejector Pins & Sleeves
The use of the thimble and the barrel is called the thimble and barrel assembly, which is one of the plastic mold accessories. The thimble and barrel are the thimble in the barrel and needle assembly. The thimble cylinder is a metal rod used for ejecting the glue product. The product is continuously ejected in the mold running at high speed, and the telescopic movement of the cylinder is used for wear or processing.
1. In plastic molds, separating the product from the mold is also the most commonly used;
2. Carbide thimble, such as tungsten steel thimble, etc., can be used to pass longer and thinner holes;
3. The thimble is also called the top. It is a conical metal round rod that is mounted on a lathe or grinder to support the workpiece and rotate the workpiece around it, but it is completely different from the thimble of plastic mold accessories;
4. Plastic mold thimble can also be used in the mold, it can play a role of stabilization, and is called as inserting pin.
The types of plastic mold thimble are: flat thimble, dome needle, support pin, standard thimble, non-standard thimble, etc.
Plastic mold thimble materials are SKH51, SKD61, SKD11, 65Mn, etc.
SKH51 thimble has better toughness than SKD61; SKD61 thimble can withstand high temperature of 1600 ℃. After nitriding treatment of SKD61 thimble surface, it can improve the wear resistance of thimble very well. 65Mn thimble is brittle and easy to break because of its poor quality Some plastic molds are no longer assembled and the thimble made of 65Mn is used.
The standard models of lathe and grinder thimble:
The standard for fixed thimble is GB / T9204.1-1988, and the standard for rotary thimble is JB / T3580-1998.
