The protagonist we are talking about today is called a round knife machine, and some call him a hob. What kind of structure is this? Let's talk about the punch first, we know that the punch uses a rotation of the eccentric character to drive the mold, so that there is a relatively large treatment and an impact generated by an acceleration of the throw.
We know that punching machines are usually used to cut, shape, bend, and even stretch materials, so there are certain requirements for pressure. The film cutting industry we are talking about today is a kind of light stamping, usually from tape or Pet membranes, etc., the impact force required by these materials is not very high, mainly used to punch out the shape.
The punching machine used in this film cutting industry is a bit of overkill. Normally, hardware molds are usually opened, but magic cutting usually only needs to open a knife mold. The traditional mold has a wooden mold, which is to use a laser to cut a seam on the wooden board and use a knife. Insert this seam. When opening the mold, as long as the laser cuts this seam according to the shape of the first product, the knife is also made according to this horizontal line.
There is also a mold called the etching knife mold. Now a rough outline is printed on a thin steel plate, and a layer of things is covered on the outline, and then the entire board is placed in the potion, so that the exposed material and potion will rise. The chemical reaction corroded this part of the material to him, leaving such a painful contour, and then I went on the engraving machine and carved out the angle of the knife.
Others use aluminum or steel plates to cut a seam to bend the knife into the same shape and stuff it into a small seam. This accuracy is relatively high.
The above mentioned are actually knives used in stamping. Stamping must be done one at a time. The efficiency is relatively low. Later, someone thought, making a knife mold on the drum and rolling over the product, it would take a lot of rolling. Fast, how fast it can be cut, this efficiency can scare you to death.
This is called a hob or a round knife, but the die of a round knife is also very expensive to open. First, we have to calculate the size of the tool on the plane, and then project it onto a circular arc. Only in this way, in the knife When the mold rotates, the material moves with him to ensure the size of the product model.
This mold suddenly changed from a two-dimensional plane to a three-dimensional three-dimensional. Therefore, I have a subversive understanding of the traditional model. Even the thickness of the material and the depth of the cutting tool have a very significant impact on the knife mold. It's huge, so this man with a sword can't open it.
Let me briefly say here that you can understand as much as you can understand. If you don’t understand, you can throw this problem to the supplier and let the supplier handle it. The first way is to calculate. We calculate the length of the cutting line of the die, and then Pass this length into a three-dimensional package and wrap it on the cylinder.
The diameter of the cylinder should be the height of the knife. The worst here is the height of the exposed board, which is closely related to the thickness of the material to be punched. There is also the foam on the inverted film. This is the house material in the spring. A pressing device that deforms at the same time to prevent the blade from hitting.
The second method is relatively simple. We can use the wrapping function in the SolidWorks software to directly wrap the knife on the plane on the cylinder. This is relatively accurate, but the premise is that you need to know this software. Otherwise, it is a big joke, and you can only use the stupid way behind.
This stupid method is the third method, the product package is reversed thinking, the size of the die is defined directly according to the size of the product, and then the gap between the products is calculated, and the circumference of the cylinder is calculated, and then the pi is taken to calculate the diameter.
