MIM mold processing plant Analysis of precautions before injection mold test

1. know the relevant information of mold:

We can get the design surface of the mould, analyze it in detail, get the mold technician to take part in the trial work.

2. check its mechanical coordination on the workbench first.

Pay attention to scratching, missing parts loosening, whether the action of the slide plate is true, whether there is any leakage of the water gas connections, if the opening of the die is restricted, it should be marked on the die. If the above movements can be done before hanging the mold, you can avoid finding problems while hanging the mold, then remove the time wastage caused by the mold.

3. when determining the proper action of each part of the die, it is necessary to the suitable model injection machine.

(a) how much is the injection volume of the injection molding machine?

(b) the lower die for the inner distance of the pull rod.

(c) whether the moving schedule of the activity template meets the requirements.

(d) whether the tools accessories for other trial moulds are well prepared.

Everything is confirmed that there is no problem, then the next step is to hang the mold. When hanging, you should pay attention to locking all the clamping formwork lifting the fishing hook before opening the mold, so that the clamping plate will be loosened broken, so that the mold will fall. After the die is installed, the mechanical action of each part of the mold should be carefully inspected, such as whether the action of skateboard, thimble, tooth removal structure limit switch is true.  pay attention to the alignment between the nozzle the feed port.

The next step is to pay attention to the mold closing action. At this time, the die pressure should be lowered, in the manual low speed clamping action, attention should be paid to whether there is any unsmooth movement abnormal sound. The process of lifting the mold is relatively simple. The main point is the mold gate the center of the nozzle. It is usually difficult to adjust the center with the test paper.

4. increase mold temperature:

According to the performance of the finished products the size of the mold, the appropriate mold temperature control machine is used to raise the mold temperature to the temperature required during production.After the increase of the die temperature, the movements of the parts must be re examined, because the steel may cause the clamping phenomenon after thermal expansion, so we should pay attention to the sliding of the parts so as to avoid the occurrence of strain tremor.

5. if the factory does implement the experimental plan rule, we propose that only one condition can be adjusted at a time to adjust the condition of the trial, so as to distinguish the effect of single condition change on the finished product.

6. according to the raw materials, the raw bake should be properly roasted.

7. try use the same raw materials as possible for future mass production.

8. do test the mold thoroughly. If there is color requirement, you can arrange the color test.

9. internal stress other problems often affect the two processing. After the mold is finished, the product should be processed two times after the product is stable. After the slow closing, the die pressure should be adjusted, several times should be taken to check whether the clamping pressure is equal, so as to prevent the finished products forming the edge die deformation.

After the above steps are checked, the die closing speed the die pressure are lowered, the safety buckle the top travel distance are fixed, the normal die closing closing speed are adjusted. If the limit switch is involved in the large stroke, the adjustment of the die opening stroke should be slightly shorter, the high speed die opening action should be cut off before the large opening of the die. This is due to the fact that during the entire mold opening process, the high speed action is longer than the low speed. On the plastic machine, the mechanical ejector pin must also be adjusted after the full speed die opening action, so as to avoid the deformation of the ejector plate the peeling plate.

Please check the following items before making the first mode injection:

(a) whether the feeding stroke is too long insufficient.

(b) whether the pressure is too high too low.

(c) filling speed is too fast too slow.

(d) whether the processing cycle is too long too short.

To prevent short shoot, fracture, deformation, burr even damage to mold. If the processing cycle is too short, the thimble will go through the finished product strip the ring to crush the finished product. Such situations may take you two three hours to extract the finished products. If the machining cycle is too long, the thin part of the mold may be broken due to the tightening of the rubber. Of course, it is impossible for you to anticipate all the problems that may occur during the trial run. However, careful consideration of timely measures in advance will help you avoid serious expensive losses.