How to choose the right injection molding machine

Release time:2017-04-26 Author:admin Browse volume:1888
1, choose the right type: from the product and plastic to determine the type and series.
Because there are many kinds of injection molding machines, so begin this product should correctly judge what kind of injection molding machine, or which is a series of production, such as general thermoplastic plastic or bakelite raw materials or raw materials such as PET, is a monochrome, two-color, multi-color, sandwich or mixed color. In addition, some products need high stability (closed loop), high precision, high speed, high pressure and fast production (multi loop) and other conditions, must choose the appropriate series production.
2, put down: the size of the mold to determine the size of the machine, "big column distance", "mold thickness", "mold minimum size" and "die size" is appropriate to confirm whether the mold can be put down.
The width and height of the mold should be less than or at least one side smaller than the inner diameter of the column;
The width and height of the mould is best in the size of the mould plate;
The thickness of the mold should be between the thickness of the injection molding machine;
The width and height of the mold should be in accordance with the minimum mold size recommended by the injection molding machine.
3, get the conclusion: by the mold and the finished product to determine the "open mold stroke" and "die" is enough to make the finished product.
The opening stroke should be at least two times higher than the height of the finished product in the direction of the switching mode, and the length of the sprue (sprue) should be included;
The mold travel needs to be sufficient to the finished product.
4, lock by plastic products and determine the "locking force" tonnage.
When the raw material is injected into the mold cavity with high pressure, it will produce the power of a supporting die. Therefore, the clamping unit of the injection molding machine must provide enough clamping force to prevent the mold from being opened. The calculation of clamping force requirements is as follows:
The projected area of the finished product in the direction of the switching mode is calculated from the finished product's external dimensions;
Die strength = finished product in the direction of the switch mode projection area (cm2) * die hole number * die pressure (kg/cm2);
The die pressure varies with the raw material, and the raw material is 350~400kg/cm2;
The clamping force of the machine needs to be greater than the force of the supporting die, and for the sake of safety, the clamping force of the machine is usually more than 1.17 times than that of the supporting die.
This has tentatively decided clamping unit specifications, and roughly determine the aircraft tonnage, then must do the following steps to confirm which one injection unit screw diameter compared with the required.
5, shoot the full: by the weight of the finished product and the number of die holes to determine the amount of "injection" and select the appropriate screw diameter".
To calculate the weight of finished product should be considered cavity number (the first mock exam a few points);
For the sake of stability, the amount of injection should be more than 1.35 times the weight of the finished product, that is to say, the weight of finished product should be less than 75% of the amount of injection.
6, shoot well: from plastic to determine the screw compression ratio and injection pressure and other conditions.
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