Trying out a mold in an injection mold is a very important step, so what should we pay attention to when trying out a mold for injection molding?
● Ready for DFM
The engineer in charge needs to prepare DFM to check the mold structure in detail. It needs to be cleared on the spot. If there is something wrong, it needs to be recorded in the mold test condition table for feedback correction.
● Check the water connection method and set various conditions
Responsible for the project, one by one water connection method (following DFM one in and one out), mold temperature setting, material tube temperature setting, and injection condition inspection. Non-conformities need to be corrected immediately. Condition table records, so that issues can be improved during the review.
● Product injection 90-95% full
The product measurement needs to be estimated before the product is launched. Prior to the MOLDFLOW condition, the holding pressure conversion position is advanced. The product needs to be held at 0 pressure. The product is 90-95% stable and the screw storage material is maintained at about 10% (the mold has a mold. When you have multiple cavities, you need to check whether the feeding of each cavity is uniform, otherwise you need to keep samples to facilitate mold adjustment.) Then slowly increase and hold 10 pressures until the appearance of the product reaches a qualified state.
● Check the size and appearance
When the appearance of the product is adjusted to an acceptable state, take 2 mold products and soak in water for 2-5 minutes. Measure the size. Based on the product size, adjust the size to the middle limit of the drawing without assembly requirements, followed by the structure. Adjust the appearance and fine-tune the injection parameters. Use the better appearance structure (confirm the shrinkage, burrs, lack of materials, bonding lines and other defects) to produce the required number of samples, and record the conditions and the molding condition table for next use. If you cannot overcome the need, Keep sample records for easy review and improvement.
● Check the mold temperature and the temperature of the water in and out of the water pipe
Before and after injection, 10 molds and 30 molds are required to be stable for at least three times. The temperature at the inlet and outlet of each water pipe should be measured. The temperature difference between each inlet and outlet should be no more than 3 degrees.
In addition, the measured temperature on the mold surface needs to be measured. Depending on the size and shape of the product, large products need to measure at least 5 points of temperature. If there is a large temperature difference, it needs to be confirmed. When the mold temperature is stable, it needs to be recorded on the mold surface. ), The mold surface temperature needs to be within the recommended range of the physical properties table, if it can not meet the requirements, you can try to change it if allowed.
● Check mold clamping
If there is a burr after the product is shot, you need to call a fitter to the scene immediately, spray red dan on the machine, and close the mold with a large clamping pressure at a low speed of about 30 BAR.
● DOE analysis to find more suitable conditions
If the product cannot be satisfactorily sized or deformed under the conditions of multiple molding adjustments, the engineering and the adjustment technicians will discuss it. The engineering will list the DOE analysis form, and adjust the combination of the parameters that can be affected by the product problem points. Test one by one, and make condition records and sample records for each changed condition, CPK analysis, after completion, after testing and evaluation, select the conditions for next reference.
● Early detection and early resolution
If there are deformation and size problems in the soft mold stage, you need to work hard in the soft mold stage, otherwise the meaning of mold opening will be lost.
● Mold change procedure
The customer needs to be notified when the mold needs to be changed, and the mold cannot be modified without permission. Any changes require customer approval.