Thimble, there are many ways to call it. The push rod, inlaid needle, middle needle and drag needle in the mold accessories are actually what we call the mold thimble. The other kind of thimble is the thimble used by the older generation when sewing clothes or shoes. It can also be called thimble. The role of thimble is to help penetration. Therefore, the mold thimble is different from the sewing thimble. The small editor of the rotary thimble manufacturer will introduce to you:
1. Thimble in mold fitting
Die thimble ( English: Die thimble ) is a plastic mold accessory, which is used in plastic molds. Thimble can also be called push rod, inserted needle, middle needle, supporting needle, etc. sometimes the center used by lathe is also called thimble.
The role of ejector pin as a spare part in the mold:
① In the plastic mold, the product is separated from the mold, which is also the most commonly used;
② Cemented carbide thimble, such as tungsten steel thimble, can be used to pass through longer and thinner holes;
③ The thimble is also called the center. It is a conical metal rod with a head that is assembled on a lathe or grinder to support the workpiece and make the workpiece rotate around it. However, it is completely different from the thimble of plastic mold accessories;
④ The thimble of plastic mould can also be used inside the mould. It can play a stabilizing role and is called inlaying needle.
The types of plastic mold thimbles are: dome thimble, supporting thimble, standard thimble, non-standard thimble, etc.
The ejector pins of plastic moulds are made of SKH51, SKD61, SKD11, 65Mn, etc.
The toughness of SKH51 thimble is better than SKD61. SKD61 thimble can withstand 1600 ℃ high temperature. The wear resistance of SKD61 thimble can be improved after nitriding treatment. 65Mn thimble is easy to break because of its poor quality and brittle quality. Most plastic molds are not equipped with and use 65Mn thimble.
2. Thimble in sewing articles
Thimbles, also known as Dingzhen, were commonly used by the Chinese people in the old times for sewing. They were generally made of iron or copper. Hoop shaped, covered with small pits, usually set on the middle finger to push the tail of the needle, so as not to hurt the hand. In addition, it can push the tail of the needle to make the finger easier to force, so as to penetrate the clothes.