సెకండ్ హ్యాండ్ ఇంజెక్షన్ మోల్డింగ్ మెషీన్‌ను ఎలా ఎంచుకోవాలి

How to choose a second-hand injection molding machine

The important factors that usually affect the selection of injection molding machine include mold, product, ప్లాస్టిక్, molding requirements, మొదలైనవి. అందువలన, the following information must be collected or obtained before making a selection: 1. Mold size (width, ఎత్తు, మందం) , weight, special design, మొదలైనవి; 2. The type and quantity of plastic used (single raw material or multiple plastics); 3. The appearance size (length, width, ఎత్తు, మందం) and weight of the injection molded product; 4. Molding requirements, such as Quality conditions, production speed, మొదలైనవి. After obtaining the above information, you can follow the steps below to choose a suitable plastic injection molding machine:

1. Choose the right type:

Since there are many types of second-hand injection molding machines, it is necessary to correctly judge which type of injection molding machine or which series the product should be produced at the beginning, such as general thermoplastic or bakelite raw materials Or PET raw materials, మొదలైనవి, are single-color, double-color, multi-color, interlayer or mixed color, మొదలైనవి.

అదనంగా, some products require high stability (closed loop), high precision, ultra-high injection rate, high injection pressure or rapid production (multi-loop), మొదలైనవి, and the appropriate series must also be selected for production.

2. Can fit the ఇంజక్షన్ అచ్చు:

Determine whether the “big column inner distance”, “mold thickness”, “minimum mold size” మరియు “mold plate size” of the machine are appropriate according to the mold size, so as to confirm whether the mold can be placed.

గమనిక: ①The width and height of the mold must be smaller than or at least one side is smaller than the inner distance of the large column; ②The width and height of the mold should preferably be within the size range of the mold plate; ③The thickness of the mold should be between the mold thickness of the injection molding machine; ④The width and height of the mold must meet the minimum mold size recommended by the injection molding machine, and it is not acceptable if it is too small.

3. Take out injection molding products:

Determine whether the “అచ్చు తెరిచే స్ట్రోక్” మరియు “mold ejection stroke” అచ్చు మరియు తుది ఉత్పత్తి ద్వారా తుది ఉత్పత్తిని బయటకు తీయడానికి సరిపోతుంది.

①The mold opening stroke must be at least twice the height of the finished product in the direction of opening and closing the mold, and must include the length of the vertical sprue;

②The ejection stroke must be sufficient to eject the finished product.

4. Can lock the plastic solution:

యొక్క టన్ను “బిగింపు శక్తి” ఉత్పత్తి మరియు ప్లాస్టిక్ ద్వారా నిర్ణయించబడుతుంది.

When the raw material is injected into the mold cavity at high pressure, it will generate a force to support the mold. అందువలన, ఇంజెక్షన్ అచ్చు యంత్రం యొక్క బిగింపు యూనిట్ తగినంతగా అందించాలి “బిగింపు శక్తి” to keep the mold from being stretched. The calculation of the clamping force requirement is as follows:

① Obtain the projected area of ​​the finished product in the direction of the opening and closing mold from the appearance size of the finished product; /cm2); ③The pressure in the mold varies with the raw material, మరియు సాధారణ ముడి పదార్థం 350 ~ 400kg/cm2; more than double. ఇప్పటివరకు, బిగింపు యూనిట్ యొక్క లక్షణాలు ముందుగా నిర్ణయించబడ్డాయి, మరియు మోడల్ యొక్క టన్ను దాదాపుగా నిర్ణయించబడింది. అప్పుడు, the following steps must be carried out to confirm which injection unit has a more suitable screw diameter.

5. Shot to fill the injection mold cavity:

అవసరమైనదాన్ని నిర్ణయించండి “injection volume” and select the appropriate “స్క్రూ వ్యాసం” based on the weight of the finished product and the number of mold cavities.

To calculate the weight of the finished product, the number of mold cavities (one mold with several cavities) needs to be considered;

For the sake of stability, ఇంజెక్షన్ వాల్యూమ్ కంటే ఎక్కువగా ఉండాలి 1.35 తుది ఉత్పత్తి బరువు కంటే రెట్లు, అంటే, తుది ఉత్పత్తి యొక్క బరువు లోపల ఉండాలి 75% ఇంజెక్షన్ వాల్యూమ్.

6. Injection parameters of injection molding machine:

The conditions such as “స్క్రూ కంప్రెషన్ నిష్పత్తి” మరియు “ఇంజెక్షన్ ఒత్తిడి” are judged by the plastic. Some engineering plastics require a higher injection pressure and a suitable screw compression ratio design to have a better molding effect. అందువలన, in order to make the finished product injection better, the injection pressure and compression ratio must also be considered when selecting the screw. . సాధారణంగా, a smaller diameter screw provides higher injection pressure.

7. ఇంజెక్షన్ వేగం of injection molding machine:

Confirmation of “ఇంజెక్షన్ వేగం”. Some finished products require high injection rate and fast injection to form stably, such as ultra-thin products. ఈ విషయంలో, it may be necessary to confirm whether the injection rate and injection speed of the machine are sufficient , whether it needs to be equipped with pressure accumulator, closed loop control and other devices. Generally speaking, అదే పరిస్థితులలో, the screw that can provide higher injection pressure usually has a lower injection rate, and on the contrary, the screw that can provide lower injection pressure usually has a higher injection rate.

అందువలన, when selecting the diameter of the screw, ఇంజెక్షన్ వాల్యూమ్, ఇంజెక్షన్ ఒత్తిడి మరియు ఇంజెక్షన్ రేటు (ఇంజెక్షన్ వేగం) need to be considered and traded off. అదనంగా, multi-loop design can also be used to shorten the molding time with synchronous compound actions.

మీకు ఏవైనా ప్రశ్నలు ఉంటే ఇంజెక్షన్ మోల్డింగ్ ,దయచేసి అడగడానికి సంకోచించకండి FLYSE బృందం,మేము మీకు ఉత్తమ సేవను అందిస్తాము!