The principle of die and wall thickness controller

In the production process of extrusion blow molding machine, the die is a very important part. A suitable die will lead to a suitable blank, which is directly related to the shape of the blank and the thickness of the blank. The material is extruded and formed from the gap of the die, which is the process of forming the material blank.

According to its shape, there are two types of die, expansion type and shrink type. The shrink type is generally used in small products, while the expansion type is generally used in large products.

Many customers generally use the wall thickness controller, because the wall thickness controller can control the thickness of each stage of the blank, and thicken or reduce it at the corresponding position. This can be more suitable for blow molding of products. And if there is no wall thickness controller, then the die cannot be automatically opened and closed by the machine, and the gap will be fixed.

The wall thickness controller is to control the opening and closing gap of the die to control the wall thickness of the blank. The thicker the wall thickness, the larger the gap. On the contrary, the thinner the wall thickness, the smaller the gap. The working principle is that the wall thickness cylinder and the resistance ruler are used to connect the die below, and the die is stretched up and down through the connecting rod to control the gap. Therefore, since the die is mainly composed of two parts, the die core and the die sleeve. Then there are two ways to connect the tie rod to the die: core pulling or shell pulling.

The principle of shell extraction is to connect the connecting rod to the mold sleeve, and the mold sleeve is up and down, so the gap between the upper and lower parts of the mold core is also expanding and reducing.

The principle of core pulling is to connect the connecting rod to the mold core, up and down the mold core, so the gap between the mold core and the mold sleeve is also expanding and reducing.

The above is the basic principle of the wall thickness controller. In order to precisely control the wall thickness controller, it generally has its own dedicated hydraulic control system, which is more precise and easier to control.