Injection molding machine knowledge

ਜੇ ਆਮ ਗੱਲ ਕਰੀਏ, most of the customers who have been engaged in the injection molding ਉਦਯੋਗ for many years have the ability to judge by themselves and choose the appropriate ਟੀਕਾ ਮੋਲਡਿੰਗ ਮਸ਼ੀਨ to produce. ਹਾਲਾਂਕਿ, in some cases, the customer may need the assistance of the manufacturer to decide which injection molding machine to use, or even the customer may only have the product sample or idea, and then ask the manufacturer whether the machine can be produced or which model is compared. Suitable.

Injection molding machine knowledge

ਇਸਦੇ ਇਲਾਵਾ, some special products may need special devices such as pressure accumulators, closed loops, injection compression, ਕਿਉਂਕਿ IC ਟਰੇ ਦਾ ਭਾਰ ਹਲਕਾ ਹੁੰਦਾ ਹੈ, to be more efficiently produced. It can be seen that how to determine the appropriate injection molding machine to produce is an extremely important issue.

The important factors that usually affect the selection of an injection machine include molds, products, ਪਲਾਸਟਿਕ, ਮੋਲਡਿੰਗ ਲੋੜ, ਆਦਿ. ਇਸ ਲਈ, the following information must be collected or available before making a selection:

◆ Mold size (ਚੌੜਾਈ, ਉਚਾਈ, ਮੋਟਾਈ), ਭਾਰ, ਵਿਸ਼ੇਸ਼ ਡਿਜ਼ਾਈਨ, ਕਿਉਂਕਿ IC ਟਰੇ ਦਾ ਭਾਰ ਹਲਕਾ ਹੁੰਦਾ ਹੈ;

◆ The type and quantity of plastics used (ਸਿੰਗਲ ਕੱਚਾ ਮਾਲ ਜਾਂ ਮਲਟੀਪਲ ਪਲਾਸਟਿਕ);

◆ Appearance dimensions (ਲੰਬਾਈ, ਚੌੜਾਈ, ਉਚਾਈ, ਮੋਟਾਈ), ਭਾਰ, ਆਦਿ. of the injection molded product;

◆ Molding requirements, such as quality conditions, ਉਤਪਾਦਨ ਦੀ ਗਤੀ, ਆਦਿ.

Suitable ਫਰਵਰੀ:

1. Select the right model: The model and series are determined by the product and plastic. ਨੂੰ

Since there are many types of injection molding machines, it is necessary to correctly determine which injection molding machine or series the product should be produced from at the beginning, such as general thermoplastics or bakelite raw materials or PET raw materials. Color, two-color, ਬਹੁ-ਰੰਗ, ਇੰਟਰਲੇਅਰ ਜਾਂ ਮਿਸ਼ਰਤ ਰੰਗ, ਆਦਿ. ਇਸਦੇ ਇਲਾਵਾ, some products require conditions such as high stability (ਬੰਦ ਲੂਪ), ਉੱਚ ਸ਼ੁੱਧਤਾ, ultra-high shooting speed, high shot pressure, or rapid production (multi-loop), and the appropriate series must also be selected for production. ਨੂੰ

2. It can be put down: Determine whether the “Large column inner distance”, “Mold thickness”, “Mold minimum size” ਅਤੇ “Die plate size” of the machine are appropriate according to the mold size to confirm whether the mold can be put down. ਨੂੰ

◆ Besides the width and height of the mold must be smaller than or at least one side smaller than the inner distance of the large column;

◆ Then width and height of the mold should be within the size range of the mold plate;

◆ Also thickness of the mold must be between the mold thickness of the injection molding machine;

◆ Width and height of the mold must meet the minimum mold size recommended by the injection molding machine, and it will not work if it is too small. ਨੂੰ

3. Obtained: Determine whether the “ਮੋਲਡ ਓਪਨਿੰਗ ਸਟ੍ਰੋਕ” ਅਤੇ “mold stroke” are sufficient for the finished product to be taken out by the mold and the finished product. ਨੂੰ

◆ The mold opening stroke must be at least more than twice the height of the finished product in the direction of opening and closing the mold, and the length of the sprue must be included;

◆ The stroke of the supporting mold must be enough to eject the finished product.
4. Lockable: ਦਾ ਟਨੇਜ “ਕਲੈਂਪਿੰਗ ਫੋਰਸ” ਉਤਪਾਦ ਅਤੇ ਪਲਾਸਟਿਕ ਦੁਆਰਾ ਨਿਰਧਾਰਤ ਕੀਤਾ ਜਾਂਦਾ ਹੈ. ਨੂੰ

When the raw materials are injected into the mold cavity at high pressure, a mold-supporting force is generated. ਇਸ ਲਈ, ਇੰਜੈਕਸ਼ਨ ਮੋਲਡਿੰਗ ਮਸ਼ੀਨ ਦੀ ਕਲੈਂਪਿੰਗ ਯੂਨਿਟ ਨੂੰ ਲੋੜੀਂਦੀ ਮਾਤਰਾ ਪ੍ਰਦਾਨ ਕਰਨੀ ਚਾਹੀਦੀ ਹੈ “ਕਲੈਂਪਿੰਗ ਫੋਰਸ” to prevent the mold from being opened.

The calculation of the clamping force demand is as follows:

◆ Calculate the projected area of ​​the finished product in the direction of the switch mold from the appearance size of the finished product;

◆ Die 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, ਅਤੇ ਆਮ ਕੱਚਾ ਮਾਲ 350 ~ 400kg/cm2 ਹੈ;

◆ 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. ਨੂੰ

At this point, the specifications of the clamping unit have been preliminarily determined, and the tonnage of the model has been roughly determined, and then the following steps must be carried out to confirm which injection unit’s screw diameter is more suitable. ਨੂੰ

5. Full shot: Determine the required “shot volume” from the weight of the finished product and the number of mold cavities and select the appropriate “ਪੇਚ ਵਿਆਸ”. ਨੂੰ

◆ The number of mold cavities (a mold several cavities) should be considered when calculating the weight of the finished product;

◆ For the sake of stability, the injection volume must be more than 1.35 times the weight of the finished product, ਜੋ ਕਿ ਹੈ, the weight of the finished product must be within 75% of the injection volume.

6. Good injection: the plastic determines the conditions such as “screw compression ratio” ਅਤੇ “ਇਸ ਲਈ ਕੱਚੇ ਮਾਲ ਦੇ ਡਿਜ਼ਾਈਨ ਲਈ ਪੂਰੀ ਇੰਜੈਕਸ਼ਨ ਮੋਲਡਿੰਗ ਪ੍ਰਕਿਰਿਆ”. ਨੂੰ

Some engineering plastics require higher injection pressure and appropriate screw compression ratio design to have better molding effects. ਇਸ ਲਈ, in order to make the finished product shot better, the needs of injection pressure and compression ratio should also be considered when selecting the screw. . ਜੇ ਆਮ ਗੱਲ ਕਰੀਏ, a screw with a smaller diameter can provide a higher injection pressure. ਨੂੰ

7. Shoot fast: and confirm the “shooting speed”. ਨੂੰ

Some finished products require high injection rate and rapid injection for stable molding, such as ultra-thin finished products. ਇਸ ਮਾਮਲੇ ਵਿੱਚ, 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. ਜੇ ਆਮ ਗੱਲ ਕਰੀਏ, ਉਸੇ ਹਾਲਾਤ ਦੇ ਤਹਿਤ, a screw that can provide a higher injection pressure usually has a lower shot speed, on the contrary, a screw that can provide a lower injection pressure usually has a higher shot speed. ਇਸ ਲਈ, when selecting the screw diameter, ਟੀਕੇ ਦੀ ਮਾਤਰਾ, ਟੀਕੇ ਦਾ ਦਬਾਅ ਅਤੇ ਟੀਕੇ ਦੀ ਦਰ (ਟੀਕੇ ਦੀ ਗਤੀ) need to be cross-considered and selected. ਨੂੰ

ਇਸਦੇ ਇਲਾਵਾ, 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 may have to be considered, ਸਮੇਤ:
◆ The problem of size allocation:

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. ਇਸ ਮਾਮਲੇ ਵਿੱਚ, the standard specifications set by the manufacturer may not be available. To meet customer needs, so-called “size matching” must be carried out, ਜੋ ਕਿ ਹੈ, “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. ਇਸਦੇ ਵਿਪਰੀਤ, ਦੀ “small wall and large injection” refers to the original standard clamping unit with a larger injection screw. ਜ਼ਰੂਰ, there may be several levels of difference between mold clamping and injection. ਨੂੰ

◆ The concept of high-speed or high-speed machine:

In actual use, more and more customers will ask to buy the so-called “high-speed machine” or “fast machine”. ਜੇ ਆਮ ਗੱਲ ਕਰੀਏ, 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. ਆਮ ਤੌਰ 'ਤੇ, there are several ways to achieve the above purpose:

◆ Speed ​​up the injection speed: increase the motor and pump, or add a pressure accumulator (preferably closed loop control);

◆ Speed ​​up the feeding speed: increase the motor and pump, or reduce the feeding hydraulic motor to speed up the screw speed;

◆ Multi-loop system: adopts double-loop or three-loop design to perform compound actions synchronously and shorten the molding time;

◆ Increase the mold waterway to improve the cooling efficiency of the mold.

ਹਾਲਾਂਕਿ, “there is no free lunch in the world.” Although the improvement and transformation of machine performance can increase production efficiency, it often increases investment and operating costs. ਇਸ ਲਈ, the benefit evaluation before investment needs to be carefully measured in order to determine the most suitable machine. Type produces the highest benefits.

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