一般而言, 大多數從事注塑行業多年嘅客戶, have the ability to judge for themselves and choose the suitable china 注塑機 to produce. 然而, 在某些情況下, 客戶可能需要製造商嘅幫助嚟決定使用哪種注塑機, or even the customer may just have the sample or idea of the product and then ask the manufacturer. whether the machine can be produced or which model is compared.
另外, some special products may require special devices such as pressure accumulators, 閉環路, 注射壓縮, 等。, to be produced more efficiently. It can be seen that how to determine the appropriate injection molding machine to produce is an extremely important question. The following information is provided for the convenience of readers.
Important factors that generally affect the selection of an injection machine include molds, 產品, 塑料, 成型要求, 等. 因此, the following information should be collected or available before making a selection:
◆ Mold 大小 (width, height, thickness), weight, special design, 等. ;
◆ Type and quantity of plastic used (a single raw material or several plastics);
The appearance size (length, width, height, thickness), weight, 等. injection molded product;
After getting the above information, you can follow the steps below to select a suitable injection machine:1. Choose the right model: the model and series depend on the product and the plastic. Because there are many types of china injection machines, it is necessary to determine correctly from which injection molding machine or series the product should be initially made, such as common thermoplastic or bakelite raw materials or PET raw materials. Color, two-color, multicolor, interlayer or mixed color, 等. 另外, some products require conditions such as high stability (closed loop), high accuracy, very high fire, high firing pressure or fast production (multi-loop), and a suitable series must also be selected for production.
◆ The width and height of the mold must be less than or at least one side smaller than the inside distance of the large column;
◆ The width and height of the mold must correspond to the minimum mold size recommended by the injection molding machine and is too small.
◆ The opening stroke of the mold must be at least twice the height of the final product in the direction of opening and closing of the mold, and the length of the casting must be included;
◆Calculate the projected area of the finished product in the direction of the switch mold from the appearance size of the finished product;
◆Mould support force = projected area of the finished product in the direction of the switch mold (cm2) × number of mold cavities × pressure in the mold (kg/cm2);
◆The pressure in the mold varies with the raw material, and the general raw material is 350～400kg/cm2;
◆The clamping force of the machine must be greater than the clamping force, and for the sake of safety, the clamping force of the machine is usually 1.17 times greater than the clamping force.
◆The number of mold cavities (one mold and several cavities) should be considered when calculating the weight of the finished product;
◆For the sake of stability, the injection volume must be 1.35 times the weight of the finished product, 噉係, the weight of the finished product must be within 75% of the injection volume.
7.7. Shooting fast: and confirmation of “shooting speed”. Some finished products require high injection rate and rapid injection for stable molding, such as ultra-thin finished products. 喺呢種情況下, it may be necessary to confirm whether the injection rate and rate of injection of the machine are sufficient, and whether it needs to be equipped with pressure accumulators, closed-loop control and other devices. 一般而言, under the same conditions, a screw that can provide a higher injection pressure usually has a lower shot speed, 恰恰相反, a screw that can provide a lower injection pressure usually has a higher shot speed. 因此, when selecting the screw diameter, the injection volume, injection pressure and injection rate (注射速度) need to be cross-considered and selected.
另外, a multi-loop design can also be used to shorten the molding time with synchronized compound actions. After the above steps, in principle, an injection molding machine that meets the requirements can be determined, but there are some special issues that must be considered:
◆The problem of size matching:
Under certain special conditions, the customer’s mold or product may have a small mold size but a large amount of shot, or a large mold size but a small amount of shot. 喺呢種情況下, the standard specifications set by the manufacturer may not be available. To meet customer needs, so-called “size matching” must be carried out, 噉係, “big wall small shot” or “small wall big shot”. The so-called “large wall and small injection” refers to the original standard clamping die unit with a smaller injection screw. On the contrary, 這 “small wall and large injection” refers to the original standard clamping unit with a larger injection screw. 答案係肯定嘅, there may be several levels of difference between mold clamping and injection.
In actual use, more and more customers will ask to buy the so-called “high-speed machine” or “fast machine”. 一般而言, in addition to the needs of the product itself, most of the goals are to shorten the molding cycle and increase the output per unit time, thereby reducing production costs and improving competitiveness. 麻麻, to achieve the above-mentioned purpose, there are several ways:
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