What is the correct first sample process after the injection is completed?
2021-12-31
1. After the mold is installed, follow the water transportation connection method in the "Forming Condition Table" to connect the good water and set the mold temperature.
2. Set the barrel temperature.
3. After the mold temperature comes up, it can start formally.
4. First refer to the forming condition table to set the total injection stroke.
5. Debug the first section of the stroke first, that is, the rubber has just rushed through the nozzle for a short distance;
6. Debug the second section of the stroke, which is about 95% to 98% full of product.
7. Debug the last section of the stroke, that is, the stroke that is just full of the product. Pay attention to the accuracy to 1~2mm, and there should be no leftover or overcharged.
8. After debugging the three large strokes, you can set the first section to be slow, and the second section pressure and speed can be set to high pressure and speed, the maximum can be more than 90% (the prerequisite is that various appearance defects cannot appear on a large area ), the speed and pressure need to be lowered again in the last paragraph.
9. If there are local air traps, flow lines and other speed-related defects during this process, it is necessary to measure what caused the defect and estimate the stroke position of the defect, and then take the method of filling analysis to find it. In the actual position, add a slow or fast small stroke at a few mm before and a few mm behind this position to debug, and so on to improve the forming defects.
10. Hold pressure (the first stage is recommended to be set to slow speed and short time), pay attention to check whether there is a code pattern after holding pressure.
11. In order to prevent the rubber material from staying in the barrel for too long, the residual glue amount is specified as 3~8mm, so after the above actions are completed, each section of the stroke needs to be added or subtracted to adjust the residual glue amount to this range .
12. For the pressure and speed of the above sections, please refer to the existing "Forming Condition Table".
13. The basic principle of setting the cooling time of each set of molds is: under the condition that the product's long bones or long columns are not deformed, and the appearance is not white or topped, the runner is just cooled to the point that it can be taken out. Do not cool down too long.
14. The screw speed does not need to be set too fast or too slow, and its rotation time is slightly shorter than the cooling time.
15. In order to speed up the forming cycle, it is necessary to shorten the time for opening and closing the mold as much as possible, but there should be no too much noise when the mold is closed, and the nozzle that falls by itself can be safely dropped; when debugging the manipulator, it is also necessary to make the manipulator fall as fast as possible in the middle of the mold , In order to ensure that the intermediate period of forming is controlled between 4 to 6 seconds.
16. After debugging, check the appearance of the samples provided by the quality department (check for slight shrinkage, defects, flow lines, air lines, water lines and colors, and whether there are any scratches on the surface. Injuries, pitting, rust spots, etc.), but this process needs to be controlled within 10 minutes; if the self-inspection appearance is NG, please refer to the 9th item above to continue to improve;
If the self-inspection appearance is OK, 15 beers will be formed under this condition. On the one hand, observe whether there is any change in its appearance. OK immediately sign the processing board to the production team leader to produce, and send the first inspection at the same time.
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