Several Suggestions On The Installation Of Injection Molds

- Jan 26, 2021-

1. Preparation before installation


Confirm the cooling water circuit, the depth of screwing the screw into the machine board is 1.5-1.8 times of the screw diameter. If the screw is insufficient, the teeth will slip easily and the mold may fall. Confirm whether the operators, materials, tools, documents, auxiliary equipment, etc. required for production are complete.


2. Method of hanging mold


When the hanging mold is not level, the mold cavity before and after the installed mold will have different steps. For the production of precision products, there will be poor concentricity, poor step, poor tooth profile accuracy, and poor distance.

When installing the mold, we must pay attention to this problem. When the hanging mold enters and closes until the hand can push a small position, stop the mold clamping. Loosen and tighten the lifting ring, using the previous mold as a reference (because the front mold is fixed by a positioning ring), watch the back mold part, when the level of the front mold is at its best, the mold cavity position is consistent, continue to close the mold to completion, but do not start the high pressure it is good. (The upper mold must be closed for the first time without applying high pressure. After confirming that the mold can be properly closed, the high pressure can be applied).


3. The method of screwing


For molds with a low temperature, that is, a mold temperature below 50 degrees, when the mold is closed to a high pressure start, the front and rear molds can be tightened diagonally. Only 8 screws are required. When the mold temperature is above 50 degrees, do not tighten the screws before the mold temperature reaches. After the mold temperature reaches the high pressure start, tighten the screws diagonally.

The mold material will swell and increase in volume with the increase of temperature. It is more obvious when the mold temperature is high. If the screws are tightened before the temperature rises, it will have a certain impact on the mold life and mold accuracy.


4. Use of attached materials



When the thickness of the mold is not enough, it is necessary to install a template. When the mold temperature is high, it is best to install a heat shield between the machine plate and the mold. Regardless of whether it is a template or an insulation board, its flatness must be as small as possible.

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