Comparing the measured scale of each mold sample


A. Is the product dimension stable? B. Whether some sca […]

A. Is the product dimension stable?
B. Whether some scales have a tendency to increase or decrease and show that the machining conditions are still changing, such as poor temperature control or oil pressure control.
C. Whether the change of scale is within the scope of public service.

If the product size is not changed and the processing conditions are normal, it is necessary to investigate whether the product quality of each mold cavity is acceptable and its size can be within the allowable service. Note down the number of cavities that are larger or smaller than the average value in order to check whether the size of the mold is correct. Record the parameters obtained during the mold trial process, record and analyze the data as the requirements for correcting the mold and production conditions, and as a reference for future mass production.

Issues that should be paid attention to during mold trial:

Make the processing time longer to stabilize the melt temperature and hydraulic oil temperature.
Adjust the machine conditions according to the size of all products that are too large or too small. If the shrinkage rate is too large and the product appears to be lacking in injection materials, you can also refer to it to increase the gate size.
If the dimensions of each cavity are too large or too small, it should be corrected. If the dimensions of the cavity and the door are correct, then try to modify the machine conditions, such as the filling rate, mold temperature and various pressures, and check whether certain cavities are Filling is slower.
According to the cooperation scene of each mold cavity product or mold core displacement, it will be corrected separately. It is also allowed to try to adjust the filling rate and mold temperature to improve its uniformity. Check and correct the defects of the injection machine, such as oil pump, oil valve, Defects in temperature controllers, etc. will cause changes in processing conditions. Even a perfect mold cannot exert outstanding power on a poorly maintained machine. After reviewing all the recorded values, keep a set of samples for calibration and compare whether the corrected samples are improved.
Properly keep all the records of sample inspection during the mold trial process, including various pressures during the processing cycle, melt and mold temperature, barrel temperature, injection action time, screw feeding period, etc. In short, you should save everything that will help in the future The data of the same processing conditions can be established smoothly in order to obtain products that meet the quality specifications.
Nowadays, the mold temperature is often neglected when the factory tries the mold, and the mold temperature is the most difficult to grasp in the short-term mold test and future mass production. The incorrect mold temperature can affect the size, brightness, shrinkage, flow pattern and lack of material of the sample. , If the mold temperature controller is not used for mass production in the future, difficulties may arise.