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How to choose suitable injection molding machine

by:Hisson     2020-07-02
When you in choosing a injection molding machine, of course, will think of & other Appropriate & throughout; The word. So should be how to choose to choose the suitable injection molding machine? Listen to how we say next. : 1, select the right type is determined by the products and plastic model and series. Due to injection molding machine has very many kinds, so at first to correctly judge the product should be what kind of injection molding machine, or a series of production, such as is the general thermoplastic plastic bakelite raw materials or PET raw material and so on, is monochrome, two-color, multicolor, sandwich or mixed color, etc. In addition, some products need high stability ( Closed loop) , high precision, super high speed, high pressure or rapid production ( Multi loop) Conditions, such as production must also choose the appropriate series. 2, put down: by the mold size for determining the machine & other; Big column interval & throughout; 、“ Die thick & throughout; 、“ Mould minimal size & throughout; And & other; Mold size & throughout; If appropriate, to confirm the mould is put down. The mould width and height should be less than or at least one side is less than the big column interval; Mould width and height of the best in the mold size range; The thickness of the mould should be between the injection molding machine mold thickness; Width and height of the mould must be in accordance with the recommended minimum injection molding mold size, not too small. 3, and it is concluded that: from mould and finished product decision & other; Mould schedule & throughout; And & other; Joe travel & throughout; Is enough to make the finished product out. Mould schedule at least should be greater than the height of the finished product in the direction of switch mode more than double, and vertical runner is required ( sprue) The length of the; Travel need enough to finished product out. 4, lock up, decided by the products and plastic & other; Clamping force & throughout; Tonnage. When raw material with high pressure into a mold cavity can be induced in a hold the power of the mould, so the clamping unit of injection molding machine must provide enough & other; Clamping force & throughout; Make the mold not be open. The calculation of clamping force requirements are as follows: by the finished product and finished product appearance size in the direction of the switch mode projection area; Brace = finished mold in the direction of the switch mode projection area ( cm2) × Cavity number & times; Mould pressure ( kg/cm2) ; Mould pressure varies according to the raw materials, raw materials commonly take 350 ~ 400 kg/cm2. Machine mold clamping force should be greater than support, and to be on the safe side, machine clamping force is usually accompanied by greater than 1 mold. More than 17 times. So far has been preliminary decision model of the specifications of the unit, and an approximate model tonnage, then must be the following steps, to make sure which one screw diameter of the injection unit is required. 5, and be satisfied: by finished product weight and cavity number needed & other; Injection quantity & throughout; And choose the right & other; The screw diameter & throughout; 。 Calculation of the finished weight cavity should be considered, One module and a few holes) ; For stability's sake, injection quantity for finished product of the weight of 1. More than 35 times, i. e. the finished weight for injection amount to less than 75%. 6, good: the plastic judgement & other; Screw compression ratio & throughout; And & other; Injection pressure & throughout; Such conditions. Some engineering plastics need high injection pressure and the appropriate screw compression ratio design, just have good molding effect, so in order to make the finished product shoot better, also need to consider when choosing screw the needs of the radiation pressure and compression ratio. In general, smaller diameter screw can provide higher injection pressure. 7, fast, and & other; Injection speed & throughout; The confirmation. Rapid-fire out some finished products need overhead rate to stable forming, such as ultra-thin products, in this case, you may need to confirm the injection rate of the machine and shot speed enough, whether to need to match accumulator, the closed loop control device. In general, in the same conditions, can provide a high pressure screw usually firing rate is low, on the contrary, can provide a low pressure screw usually firing rate is higher. Therefore, choosing screw diameter, injection volume, injection pressure and injection rate ( Injection speed) , need to cross considerations and tradeoffs. In addition, also can use more circuit design, in order to shorten the molding time synchronization composite action. There are some special problems may also must be taken into consideration: size distribution problem: under some special conditions, customer moulds or products may be small but needed to shoot the quantity is big, or small amount of mould is big but needed to shoot and under this condition, manufacturers are preset standard may not be able to meet customer demand, and must carry out the so-called & other; Size distribution & throughout; , i. e. , & other; Great Wall small shoot & throughout; Or & other Small wall big shot & throughout; 。 The so-called & other; Great Wall small shoot & throughout; Refers to the original standard die unit with smaller injection screw, on the contrary, & other; Small wall big shot & throughout; Is that original standard die units with larger injection screw. On collocation, of course, also may die and injection level difference. Quick machine or the idea of high-speed machine: in practice, more and more customers will be asked to buy so-called & other; High speed machine & throughout; Or & other Rapid machine & throughout; 。 In general, the aim, in addition to the demand of the product itself, most of the other is to shorten the molding cycle, increase the output of per unit time, and reduce the production cost, improve the competitiveness. In general, to achieve the above purpose, there are several kinds of practice: injection speed: the motor and pump, or add accumulator ( Best with closed loop control) ; Feeding speed: motor, motor and pump or hydraulic motor in a feeding, accelerate the screw rotation speed; Multiloop system: adopting double circuit or circuit design, as a simultaneous composite action, shorten the molding time;
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