نحوه خرید دستگاه تزریق چینی مناسب

به طور کلی, اکثر مشتریانی که سال هاست در صنعت قالب گیری تزریقی مشغول هستند, have the ability to judge for themselves and choose the suitable china دستگاه تزریق to produce. با این حال, در بعضی موارد, ممکن است مشتری در تصمیم گیری برای استفاده از دستگاه قالب گیری تزریقی به کمک سازنده نیاز داشته باشد, 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.

علاوه بر این, some special products may require special devices such as pressure accumulators, حلقه های بسته, فشرده سازی تزریقی, و غیره., 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, محصولات, پلاستیک ها, الزامات قالب گیری, و غیره. از این رو, the following information should be collected or available before making a selection:

◆ قالب اندازه (عرض, ارتفاع, ضخامت), وزن, طراحی خاص, و غیره. ;

◆ Type and quantity of plastic used (a single raw material or several plastics);

اندازه ظاهری (طول, عرض, ارتفاع, ضخامت), وزن, و غیره. 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 ماشین های تزریق, 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. رنگ, دو رنگ, multicolor, رنگ میان لایه یا مخلوط, و غیره. علاوه بر این, برخی از محصولات به شرایطی مانند پایداری بالا نیاز دارند (حلقه بسته), high accuracy, very high fire, high firing pressure or fast production (چند حلقه ای), and a suitable series must also be selected for production.

2. می توان آن را زمین گذاشت: the mold size determines whether the “large column inside distance”, “mold thickness”, “minimum mold size” و “mold plate size” of the machine are suitable to ensure that the mold can be put down.

◆ 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.

3. It can be obtained: the mold and the final product determine whether the “mold opening strokes” و “mold strokes” are sufficient to remove the final product.

◆ 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;

4. The clamping unit that can lock the injection machine must provide enough “نیروی بستن” برای جلوگیری از باز شدن قالب. محاسبه نیروی گیره مورد نیاز به شرح زیر است:

◆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 (سانتی متر مربع) × تعداد حفره های قالب × فشار در قالب (کیلوگرم بر سانتی متر مربع);

◆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, و به خاطر امنیت, معمولاً نیروی گیره دستگاه است 1.17 برابر بیشتر از نیروی گیره.

5. Full shot: مورد نیاز را تعیین کنید “حجم تزریق” از وزن محصول نهایی و تعداد حفره های قالب و انتخاب مناسب “قطر پیچ”.

◆The number of mold cavities (یک قالب و چند حفره) should be considered when calculating the weight of the finished product;

◆For the sake of stability, the injection volume must be 1.35 برابر وزن محصول نهایی, به این معنا که, the weight of the finished product must be within 75% از حجم تزریق.

6. تزریق خوبه: the conditions of “نسبت تراکم پیچ” و “فشار تزریق” توسط پلاستیک تعیین می شوند. برخی از پلاستیک های مهندسی نیاز به فشار تزریق بالاتر و طراحی نسبت تراکم پیچ مناسب دارند تا اثرات قالب گیری بهتری داشته باشند.. از این رو, برای اینکه محصول نهایی بهتر عکس گرفته شود, the injection pressure requirements and compression ratio issues must also be considered when selecting the screw. .

7.7. Shooting fast: and confirmation of “سرعت تیراندازی”. Some finished products require high injection rate and rapid injection for stable molding, such as ultra-thin finished products. در این مورد, ممکن است لازم باشد تأیید شود که آیا میزان تزریق و سرعت تزریق دستگاه کافی است یا خیر, و اینکه آیا نیاز به تجهیز به آکومولاتورهای فشار دارد یا خیر, کنترل حلقه بسته و سایر دستگاه ها. به طور کلی, تحت همین شرایط, a screw that can provide a higher injection pressure usually has a lower shot speed, برعکس, a screw that can provide a lower injection pressure usually has a higher shot speed. از این رو, هنگام انتخاب قطر پیچ, حجم تزریق, فشار تزریق و سرعت تزریق (سرعت تزریق) باید متقابل بررسی و انتخاب شوند.

علاوه بر این, همچنین می توان از طرح چند حلقه ای برای کوتاه کردن زمان قالب گیری با اقدامات ترکیبی هماهنگ استفاده کرد. 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. در این مورد, the standard specifications set by the manufacturer may not be available. To meet customer needs, so-called “size matching” must be carried out, به این معنا که, “big wall small shot” یا “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, را “small wall and large injection” refers to the original standard clamping unit with a larger injection screw. البته, 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” یا “fast machine”. به طور کلی, 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. بطور کلی, to achieve the above-mentioned purpose, there are several ways:

1. Speed ​​up the سرعت تزریق: increase the motor and pump, or add a pressure accumulator (preferably closed loop control);
2. Speed ​​up the feeding speed: increase the motor motor and pump, or reduce the feeding hydraulic motor to speed up the screw speed;
3. Multi-loop system: adopts double-loop or three-loop design to perform compound actions simultaneously to shorten the molding time;
4. Increase the mold waterway to improve the cooling efficiency of the mold.

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