In this increasingly competitive business society, improving production efficiency can often help us defeat the competition. Do more with the shortest amount of time. That's the root of efficiency. This article describes various ways to improve the injection cycle using existing or newly designed injection molding machines or molds. In the case of determining the amount of energy, reduce the injection time.
Generally speaking, the injection cycle of a hydraulically driven injection molding machine refers to the start of mold clamping to the next mold clamping. Mold clamping is generally divided into four sections: fast mold clamping, slow mold clamping, low pressure mold protection and high pressure clamping, and four mold operations. Regarding the recently designed elbow-type injection molding machines, there is a regeneration mold clamping oil path to strive for a higher mold clamping speed. Under the premise that the mold is not subject to high impact, it is suitable for use.
Adopting the lowest clamping force which can avoid the burr of the finished product, the time required for the high-pressure clamping section can be shortened. Moreover, the mold, injection molding machine's tie rod, toggle and template will also extend the life due to the low clamping force. Life extension is a priority. If a mold using a 50t clamping force is sufficient, a 51t clamping force is not required, although your injection molding machine has a higher clamping force.
I have heard that the mold is simply a heat exchanger. Yes, the mold continuously removes the molten heat through the cold water channel. A properly designed mold can improve the efficiency of heat exchange. Efficient scenarios, but where allowed, ice-water cooling can reduce "cooling time". If the ice water is cooled to make the mold condensation, the dry fan and the sealed mold clamping device can reduce the dew point and prevent the condensation.
The mold is opened at the highest speed without tearing the finished product and producing a large opening sound. Some sophisticated injection molding machines have decompression equipment before the mold opening, and even the high-speed mold opening will not produce a sound. So the loud sound should be smaller than the small sound. In order to achieve precise mold stop position at high speed mold opening, brake valve or closed loop control can be used.
Eject. On small injection molding machines with low ejection force, pneumatic ejection can be used, which is faster than hydraulic ejection. Electric ejection is faster than pneumatic ejection. The mold can be designed to be ejected by the mold opening action, instead of using the ejection device on the injection molding machine, but this method can only be ejected once. This is the simplest method of ejecting while opening the mold. The ejection of the module is quite fast.
Retreat. Some finished products can be ejected multiple times using an injection molding machine. The ejector pin does not need to be retracted every time to shorten the ejection time. The ejection time needs to be controlled. The last ejection can start at the same time as the clamping. Because the stroke of the ejector pin is shorter than that of the template, the ejector pin is always retracted before clamping.
The next best thing is to do it on the one hand. The cost of an injection molding machine with 3 independent oil paths is high. Two injection molding machines that operate in parallel generally use one oil path for the clamping device and another oil path for the injection device. The two oil paths are divided into different types to perform their own functions. This is based on the injection molding machine's general clamping device oil circuit board. And injection device oil circuit board considerations.
Hybrid oil-electric injection molding machine integrates the advantages of two types of driving, and cooperates neatly. The general design is electric feeding and other actions of hydraulic pressure. Another great thing is the double pump injection. The dual pump design uses only one oil pump for injection. The oil circuit can be changed slightly to make the two pumps flush at the time of injection, thereby increasing the injection speed by nearly double.
If you really want to reduce the injection molding time, I think the most important thing is to improve the production efficiency of injection molding. For example: how much business is solved to how many customers per unit time. How much time is added to each business when solving customer problems. This is a very painful thing, and it is another thing that I have to face.