By controlling and adjusting various processing conditions to find out the best temperature and pressure conditions, as well as developing standard injection mold tryout procedures and establishing daily work methods, we can avoid the waste of time and trouble during production. The following describes the main steps of mold testing for injection molds:
1. Check whether the plastic material in the barrel is correct and whether it is baked according to the regulations.
2. Cleaning of the barrel to prevent poorly degraded rubber or miscellaneous materials from being injected into the mold, as poorly degraded rubber and miscellaneous materials may jam the mold. Check whether the temperature of the material pipe and the temperature of the mold are suitable for the processed material.
3. Adjust the mold filling pressure and injection volume to produce finished products with satisfactory appearance. When some mold cavities are not yet fully solidified, you should think before adjusting the various control conditions because a slight change in the mold filling rate may cause large changes in the mold filling.
4. Patiently wait until the conditions of the machine and mold have stabilized, which may take more than 30 minutes for a medium-sized machine. This time can be used to check the finished product may occur.
5. Screw advance time should not be shorter than the gate plastic solidification time, otherwise the weight of the finished product will be reduced and damage its performance of the finished product, when the mold is heated when the screw needs to be discretionary to extend the advance in order to compact the finished product.
6. Reasonable adjustment to shorten the total processing cycle.
7. The newly adjusted conditions at least 30 minutes of operation to stabilize, and then at least one dozen continuous production of a full sample of products, in its container marked with the date, the number of mold cavities are placed in order to test the stability of its operation and derive a reasonable control of the tolerances.
8. Measure and record the significant dimensions of the successive samples (this should be done when the samples have cooled to room temperature).
9. The size of each mold product measurements for a comparison, it should be noted: product size is stable; whether some of the dimensions have a tendency to increase or decrease and show that the machine processing conditions are still changing, such as poor temperature control or oil pressure control; size of the changes in the tolerance range.
10. If there is no change in the size of the finished product and the processing conditions are normal, it is necessary to observe whether the quality of the finished product of each mold cavity is acceptable and the size of the product can be within the allowable tolerance. Measure out the continuous or larger or smaller than the average of the mold hole number noted, in order to check whether the mold size is correct.
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