1. Clamping pressure at the beginning: The initial setting value is 25 for reference. When the pressure is too small and the speed is too slow, try to increase the speed. If the pressure is too small, the speed cannot be increased to the required speed. Add +5 each time Try, pay attention, when the pressure setting is high, the moving platen will instantly increase the high pressure to change the static state to move, so that the hole of the moving platen and the tie rod will generate a huge friction force, which will accelerate the wear of the hole and the tie rod of the machine’s moving platen over time, affecting The decline in the stability and precision of the movement of the moving plate may affect the production of individual molds that require higher precision for the mold clamping mechanism.
2. Start the mold clamping speed: it depends on the actual situation, but it should be noted that the movement should not be too fast. The speed should be consistent with the next mold clamping action, instead of an obvious pause action switch. Set low and the speed is controlled by pressure.
2. Low pressure mold clamping
The mold is pushed by low pressure and low speed, starting from the distance that needs safety protection and ending when the mold is completely closed
1. Low-pressure mold clamping speed: In practice, the speed should be slow. If the speed is too fast, even if the low pressure is set, the inertial motion still has a huge impact destructive force. When there are unexpected hard obstacles such as sliding fast position deviation, thimble breakout, etc., it will enter the mold closing action, and under the condition of effective low pressure slow mold closing protection parameters, the impact damage will be greatly reduced.
In fact, the speed can be several tens, and then do not move it, and then adjust the pressure to a very low level, such as 5, for testing, control the speed with pressure, and then increase the pressure step by step to a suitable mold closing protection speed.
2. Low-pressure mold clamping pressure: You can adjust the speed very high and the pressure very low first, such as 5 to perform the mold clamping test, because the pressure is low, even if the speed is set high, the mold clamping speed will not be very high without the pressure support Fast, control the speed with pressure, on the basis of 5, increase it a little bit to the ideal mold closing protection speed, and close the mold with the lowest pressure.
3. Start position of low-pressure mold clamping: (that is, the end position of mold clamping in the previous section) This value should be set according to the size and structure of the mold with a large difference. Generally, it is between 5-20 cm before the mold is closed. Please see this position do it. Many people just start to use low pressure when the mold is closed too close. The distance that should be protected by low pressure in advance is impacted by the previous high pressure speed to close the mold, the position of the slide is shifted, the thimble is broken, and other unexpected hard obstacles occur. , hit quickly and violently, at this time the low-voltage protection is invalid, and it is too late.
4. End position of low-pressure mold clamping (i.e. starting position of high-pressure mold clamping): This parameter is the position where the mold is just completely closed, that is, the moving platen has come to an end and has stopped. When debugging, adjust the low-pressure pressure and speed first, and then adjust the position If it is set to 0, a value of the fully closed position of the low-pressure mold clamping will be obtained from the manual mold closing test when the door is closed;
For example, this value is 2.2. The value of this value is affected by the adjustment of the electronic scale setting, the tightness of the mold adjustment, and the clamping pressure, and this value will be affected by the machine precision and the influence of small debris on the surface of the mold. Each mold clamping may There will be a small change, so set the end position a little bit larger, such as adding 0.2 to 2.4 (refer to adding 0.1-0.3), and use the lowest position to accurately protect the mold. If the position value obtained by the low-pressure mold clamping test is not used If the setting is a little bigger, just use 2.2 directly. It may often happen that the low-pressure mold clamping position is greater than 2.2, and the low-pressure position cannot be completed and cannot be switched to high-pressure mold clamping.
However, more people set the mold with a distance of a few centimeters or more before it is completely closed and terminated at low pressure. They start to use high pressure, and the low-voltage protection is invalid. It is often seen that some molds are accidentally brought with the molded products that have been pushed out. The material cavity is compressed and deformed.
3. High pressure mold locking
Start to straighten the closed mold lock with a high-pressure pusher. Many people start to use high pressure because the mold is not completely closed, and the low voltage protection fails.
1. High-pressure clamping pressure: The initial setting value is 60 for reference. When it cannot be satisfied, the pressure is increased by 10 each time. If the pressure is too high, it is unnecessary to increase the machine load;
2. High-pressure mold clamping speed: The initial setting value is 25 for reference. When it cannot meet the needs, first try to increase the pressure to check. After it fails, try to increase the speed, +10 each time. High-pressure mold clamping should not hear too much noise, the speed is doubled, and the friction loss of the mold clamping mechanism is increased by N times.
Everyone should pay attention to the difference between mold clamping and mold clamping that I mentioned above. Mold clamping = moving platen movement, mold clamping = using high-pressure pusher, hinge, straight lock to compress the closed mold, and low-voltage mold clamping protection settings. The start position and end position of low-pressure mold clamping are not correct;
One is that when the low pressure starts, the mold is too close, the position is too small, and the low pressure protection comes too late, which is affected by the higher and faster pressure and speed of the previous stage (start, fast, high speed).
The second is that the low-voltage termination position ends too early. When the mold is still a few centimeters or more away from closing, the low-voltage protection is terminated, and it is switched to high-voltage clamping. These two problems generally exist at the same time, which becomes a low-voltage closing. The position of the mold protection is too short, the front is threatened by the impact of high pressure and fast mold clamping, and the latter is pinched by high pressure mold clamping pressure, which is equivalent to the invalid protection of low pressure mold clamping.
Under invalid low-pressure protection, the following problems may occur if the mold is pressed or damaged: (entraining obstacles to close the mold at a higher pressure=compression mold, entraining hard obstacles to close the mold at a higher speed=collision mold)
1. Due to the simple structure of the mold, the mold clamping pressure is not very high, and the pressure is not broken.
2. The mold is pressed, resulting in a decrease in the precision of the mold, changing the injection molding conditions, and making it more difficult to debug the process parameters.
3. The mold is pressed, resulting in a decrease in the precision of the mold, increasing the burrs of the formed product, increasing the work intensity and workload of the production workers, accelerating the fatigue of the workers, and reducing the output, quality and efficiency of the product . Work-to-job liking is on the decline, and employee turnover may increase a little as a result.
4. The mold is pressed, which reduces the precision of the mold and increases the burr of the formed product. The original personnel can no longer meet the labor demand of the work, and it is necessary to increase the manpower to make the products manufactured by labor-intensive production, the labor is more intensive, the labor expenditure is increased, and the manufacturing cost of the product is increased.
5. The mold is pressed and bumped, causing the mold to be damaged so that it cannot be produced, delaying production, and it takes time and money to repair the mold.
6. If the smooth surface of the mold cavity is bumped and crushed, no matter how it is repaired, it is difficult to avoid leaving a repair mark and a mark on the formed product. For the combined finished product, which belongs to the plastic part on the direct viewing surface, one There is a trace of repair on the smooth product surface, which is a blemish, which may affect the quality and grade of the product.
7. The mold is crushed and damaged. Repair bad molds by welding and splicing. The quality and performance of the mold will decline rapidly, and the incidence of mold failure will increase, which will increase the cost of mold operation and maintenance. With more repairs, more repairs, and a gradual decrease in precision, the service life of the injection mold will eventually be shortened due to accidental impacts and oppression during production because it is not well protected during production.
To sum up all the things mentioned above, stamping dies and impact dies, which have a lot of impact on production quality, output, cost, and efficiency, should do something to avoid their occurrence.
