• 2023-09-04
• 373
• 5 Comments

Several suggestions for injection mold installation

1. Preparation before installation

Confirm the cooling water waterway, screw into the depth of the plate is 1.5-1.8 times the diameter of the screw. If the screw is not enough, it is easy to slip the teeth, and there is a risk of mold falling. Confirm that the necessary personnel, materials, tools, documents, auxiliary equipment, etc. are complete.

2, the method of hanging die

When the hanging die is not level, there will be different stages of the mold cavity before and after the installation of the mold, and for the production of precision products, there will be poor concentricity, poor segment difference, poor tooth accuracy, poor distance and other phenomena.

In the installation of the mold, we must pay attention to this problem, when the hanging mold into the closing hand can push the smaller position, stop the closing. Loosen and tighten the ring, the former mold as the basis (because the front mold is fixed with a positioning ring), watch the back mold part, and the front mold level is better, the mold cavity position is consistent, continue to close the mold to complete, but do not start high pressure. (The first closing of the upper die must not be high pressure first, and the high pressure can be raised only after confirming that the closing can be normal).

3, the method of playing screws

Low temperature is the mold temperature below 50 degrees, when the mold can be closed to high pressure starting, the front and back mold diagonally tighten the screws, 8 screws can be screwed, when the mold temperature is above 50 degrees, the screw should not be tightened too tightly before the mold temperature reaches, and then high pressure starting after the mold temperature reaches, diagonally tighten the screws.

The mold material will expand and the volume will increase with the increase of temperature. When the mold temperature is high, it is more obvious, if the screw is tightened before heating up, it has a certain impact on the life of the mold and the accuracy of the mold.

4, the use of accessories

When the mold thickness is not enough, it is necessary to install a template. When the mold temperature is high, the heat insulation plate is installed between the plate and the mold as far as possible. Whether it is a template or a heat shield, its flatness must be as small as possible.

If the flatness is large, the front and back of the mold are not parallel, and there is a difference after high pressure closure, which affects the quality of the product. When the mold temperature reaches the set value, check the actual temperature of the mold, and adjust the mold thickness once.

Some basic knowledge of plastic mold

The plastic mold is composed of two parts: dynamic mold and fixed mold. The dynamic mold is installed on the moving template of the injection molding machine, and the fixed mold is installed on the fixed template of the injection molding machine. During injection molding, the moving mold and the fixed mold are closed to form the pouring system and cavity, and the moving mold and the fixed mold are separated when the mold is opened to remove the plastic products.

Although the structure of the plastic mold may vary due to the variety and performance of the plastic, the shape and structure of the plastic product and the type of the injection machine, the basic structure is the same.

According to the function of the plastic mold, it is mainly composed of: pouring system, temperature control system, molding parts system, exhaust system, guiding system, ejecting system and so on. Among them, the casting system and the molding parts are in direct contact with the plastic, and change with the plastic and products, which is a very complex and variable part of the plastic mold, requiring high processing finish and precision.

According to the structure of the plastic mold, it is generally composed of several parts, such as the mold frame, the mold kernel, the auxiliary parts, the auxiliary system, the auxiliary setting, and the dead Angle processing mechanism.

A general plastic mold injection machine mainly includes an injection device, a mold closing device, a hydraulic transmission system and an electrical control system. The main function of the injection device is to uniformly plasticize the plastic and inject a certain amount of molten material into the cavity of the mold with sufficient pressure and speed. The injection device is mainly composed of plasticizing parts (screw, barrel and nozzle) and hopper, transmission device, metering device, injection and moving cylinder.