Injection molding machine clamping parameters setting

Time:2022-05-17 09:04:29 / Popularity: / Source:

1. Start clamping

1. Start clamping pressure: Initial setting value is 25. When pressure is too small and speed is too slow, you can try to increase speed. This pressure is too small, speed cannot be increased to speed when needed. Speed is increased by +5 each time. Note that when pressure is set to a large value, movable mold plate will be instantly increased by high pressure to change static state and become moving, so that movable mold plate hole and tie rod will generate huge friction, which will accelerate wear of machine's movable mold plate hole and tie rod for a long time. Stability and precision of movement of movable platen will be affected. It may affect production of individual molds that require higher precision for clamping mechanism.
2. Starting mold clamping speed: It depends on actual situation, but it should be noted that action should not be too fast. Speed should be a continuous movement with next mold clamping action, instead of an obvious pause action switch. It is best to set speed to high and pressure to set low, pressure controls speed.

2. Low pressure clamping

Push mold at low pressure and low speed, from distance that needs safety protection to complete closure of mold.
1. Low-pressure mold clamping speed: According to actual situation, speed should be slow or too fast. Even if low pressure is set, inertial motion still has a huge impact and destructive force. Sliding position shifts quickly, thimble breaks out...
When there is an unexpected hard obstacle, it will enter mold clamping action. Under effective low pressure and slow mold clamping protection parameter conditions, impact damage can be greatly reduced. In fact, speed can be several tens, then do not move it, and start to adjust pressure very low, such as 5 for testing, control speed with pressure, and then increase pressure step by step to a suitable clamping protection speed.
2. Low-pressure mold clamping pressure: You can adjust speed to a very high first, and pressure to be very low. For example, 5 for mold clamping test, because pressure is low, even if speed is set to be large, pressure support is lost, mold clamping speed will not be very fast. Use the pressure to control the speed. On the basis of 5, add a little bit to ideal clamping protection speed, and close mold with the lowest pressure.
3. Starting position of low pressure mold clamping: (that is, ending position of mold clamping in previous section) This should be set according to size and structure of mold with a large difference in size, generally between 5-20 cm before mold is closed. This position is up to everyone. Many people just set mold to close too close, then start to use low pressure. Distance that should be protected by low pressure in advance is impacted by last large pressure speed to close mold, sliding position is shifted, thimble is broken, ...
4. End position of low-pressure mold clamping (ie start position of high-pressure mold clamping): This parameter is position where mold is just completely closed, that is, moving mold plate has reached end and stopped. When debugging, adjust low-pressure pressure and speed first, then set position to 0, close door and manually mold clamping test to obtain a low pressure mold clamping fully closed position value;
For example, this value is 2.2. Value of this value is affected by adjustment of electronic ruler, tightness of mold, size of clamping pressure, this value will be affected by accuracy of machine and influence of small debris on mold surface. There may be a small change each time mold is closed, so end position should be set a little larger, such as adding 0.2 to 2.4 (refer to adding 0.1-0.3) to accurately protect mold at the lowest position.
If you don't set position value obtained by low-pressure mold clamping test to be a little larger, just use 2.2. It may often happen that low-pressure mold clamping position is greater than 2.2, low-pressure position cannot be ended and cannot be switched to high-pressure mold clamping. However, more people are setting mold and there is a distance of a few centimeters or longer,  and low pressure is terminated without being completely closed. High pressure is used, and low pressure protection is invalid. It is often seen that some molds are accidentally brought out by accidents and formed products are closed, steel mold cavity is compressed and deformed.
Injection molding machine clamping parameters setting 

3. High pressure mold clamping

Begin to use a high-pressure pusher to hinge and straighten closed mold lock. Many people just set mold to be not completely closed, then start to use high pressure, and low pressure protection fails.
1. High pressure clamping pressure: initial setting value is 60, when it cannot be satisfied, pressure is +10 each time, pressure is too large, it is not necessary to increase machine load...
2. High pressure clamping speed: Initial setting value is 25. When need cannot be met, first try to increase pressure to check, then try to increase speed, +10 each time. High-pressure mold clamping should not hear too much noise, speed is doubled, friction loss of mold clamping mechanism is increased by N times.

4. Everyone should pay attention

Difference between mold closing and mold clamping I mentioned above is that mold closing = moving mold plate movement, mold clamping = use a high-pressure pusher to hinge, straighten and lock closed mold, set low-pressure mold clamping protection. In fact, most people did not do right position at start position and end position of low pressure mold closing. First, when low pressure start position, mold is too close, position is too small, low pressure protection comes too late, it is affected by higher and faster pressure and speed of previous section (start, fast, high speed).
Second is that low-pressure termination position ends too early. When mold is still a few centimeters or more away from being closed, low-pressure protection is terminated and high-pressure mold clamping is switched. These two problems generally exist at the same time, which becomes a low-pressure closure. If mold protection position is too short, it is threatened by impact of greater pressure and rapid mold closing before being pressed by high pressure clamping pressure on both sides, which is equivalent to invalidation of low pressure mold clamping protection.
Under ineffective low-pressure protection, following problems may occur when mold is compressed or damaged: entrained obstacles are clamped at a higher pressure = compression mold, entrained hard obstacles are clamped at a higher speed = mold clamping
1. Due to simple structure of mold, clamping pressure is not very large, and pressure is not broken.
2. Mold is compressed, which reduces precision of mold, changes injection molding conditions, makes it more difficult to debug process parameters.
3. Mold is compressed, which reduces precision of mold, increases burrs of formed product, increases work intensity and workload of production workers, accelerates fatigue of workers, decreases output, quality, and efficiency of product. Degree of liking for work is declining, turnover of employees may increase a little as a result.   
4. Mold is pressed, which reduces precision of mold, which increases burrs of formed product. Originally scheduled personnel can no longer meet labor needs of work, it is necessary to increase number of manpower to make labor-intensive production of products, labor is more intensive, labor expenditure is increased, and production cost of product is increased.
5. Mold is crushed and hit, causing mold to be damaged and unable to produce, delaying production, it takes time and expense to repair mold.
6. Smooth surface of mold cavity is hit and crushed. No matter how it is repaired, it is difficult to avoid leaving a repair mark and leaving a mark on formed product. There is a repaired mark on smooth surface of product. This is a flaw in United States, quality and grade of product may be affected.
7. Mold is crushed or damaged. Welding, connecting and repairing bad molds. Quality and performance of molds are deteriorating rapidly, incidence of mold breakage is increasing, which increases cost of mold operation and maintenance. With gradual decline of repairing, replenishing and precision, service life of injection mold will eventually be damaged due to accidental impact in production because it is not properly protected in production, and final life will be shortened.

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