中国の高性能射出成形機サプライヤー

ブログ

»» ブログ

チラーと金型および射出成形機のマッチング方法

アクリル射出成形プロセス 18, 2021

誰もが知っているように, 冷却装置は広く使用されています, そのうちの 1 つはプラスチック金型の冷却です. 基本的に, most plastic mold production plants are indispensable for the chiller, 今日はFlyseについて詳しくご紹介します. 金型製作における適切なチラーの選び方. 加えて, since 圧力要件は、部品の設計と機械について慎重に計算されています are often used together with チラー, it is unavoidable to introduce them here.

初め, how to choose a chiller

空気冷却器

実際には, 金型は熱交換器です. The heat is transferred from the molten plastic to the mold, and then from the mold to the circulating cooling medium-ice water. Only a small amount of heat enters the air and the pressure of the injection molding machine. テンプレート. As everyone knows, quite a few of the plastic molding cycles are used for cooling, sometimes accounting for more than 80% の plastic molding cycle. したがって, it is absolutely necessary to control the cooling time to a minimum. 例えば, 金型の成形サイクルは一般的に 20 秒. If the water in the cooling tower is replaced by the ice water generated by the chiller, に短縮することができます 16 秒. Although it is more expensive to select and equip the chiller at the beginning, it can increase the output value by 20%, and can obtain great benefits in the long-term production.

もう1つは、材料の加熱プロセス中に発生するさまざまなガスを除去することです。, how to choose ice water energy? From the above, we can know that it is related to the specific heat capacity of the molding material, the temperature and weight of the melt when the glue is melted, and the temperature when the finished product is demolded.

一般的, the injection molding mold is cooled, and the ice water pressure is selected from 0.1 to 0.2Mpa to satisfy the request. The microcomputer full-function chiller can satisfy this request. When the pressure request is higher than 0.2Mpa, another plan is required to facilitate the selection of the corresponding pressure. PMMAはドライホッパーに保管する必要があります チラー ウォーターポンプ in order to meet the needs of the system water supply.

The connection table between flow and pipe diameter:

How to match the chiller with plastic molds and injection molding machines?

金型に必要な氷水エネルギーの計算式は次のとおりです。: q=w×c×t×s

式では: q is the required ice water energy kcal/h;

W is the plastic raw material weight kg/h;

C is the specific heat of plastic raw materials kcal/kg℃;

T is the temperature difference ℃ between the melt temperature and the finished product demoulding;

s is the safety factor (usually 1.35—2.0). 単一のマシンが一致した場合, 通常は小さな値が選択されます, チラーが複数の金型に適合する場合は、大きな値が使用されます。. 例えば, 空冷チラーを選択した場合, s is also It should be appropriately larger.

例えば: a mold produces pp finished products, and the output value per hour is about 50kg. What is the cooling requirement? What size water chiller should be equipped with? q=50×0.48×200×1.35=6480 (kcal/h); cooling capacity of 6480kcal/h per hour is required, and ls203s chiller can be used.

In the process of selecting chillers in practice, it is difficult to obtain well-compared data. これまでの販売企画とサポートの経験によると, t=200℃, which is an average value of many commonly used products after years of calculation.

モールドにホットグルーレーンが付着している場合, the energy of the hot glue lane should also be included in the calculation of the cooling capacity. 一般的, the hot glue lane is in kw, and the unit should be converted to kcal/h when calculating, 1kw=860kcal/h. 工場への給水が十分であれば, 気温が低いです, そしてコストが低い, there is no need to use a chiller at this moment. This is generally impractical unless the factory can be located near a large lake with a low water temperature. The other is to use urban areas. Deep well water supply meets the needs of temperature and flow, しかし、コストが高すぎることがよくあります. This method can be used for test equipment, but for factories, it is impractical to do so.

Ice water temperature difference

The temperature of the plastic mold cooling fluid (氷水) generally changes greatly due to the processing materials and the shape of the finished product. 例えば, for polystyrene thin-walled beakers, the mold requires the ice water temperature to be below 0°C; in most other cases, The temperature of the ice water requested by the mold is above 5℃, the microcomputer full-function chiller can provide ice water above 5℃, and the low-temperature intelligent temperature control chiller can satisfy the request below 5℃ and below 0℃.

The temperature difference of the ice water at the entrance and exit of the プラスチック金型 is often set according to the requirements of the finished product. 多くの場合, the temperature difference of 3-5°C is the most ideal, but sometimes the temperature difference is also required to be 1-2°C. The smaller the temperature difference, it means that the same amount of heat is taken out, the larger the flow of ice water is needed, and vice versa. 例えば: when the temperature difference is 5°C, the flow rate needs 60l, and when the temperature difference is 2°C, the flow rate needs 150l.

Ice water flow

The flow of ice water required for a plastic mold is directly related to the heat to be taken away by the mold and the temperature difference between the ice water in and out of the mold. 例えば: To take the heat of 6480kcal/h away from the mold, if the temperature difference is 3℃, what is the minimum flow rate required? Ice water flow q=6480÷3÷60=36 (l/min).

第4, the theory of ice water quality

The softening of water is also a question that cannot be ignored in the process of using the chiller. The ph value of water also needs to be continuously observed. It is best that the ph value should be equal to 7, and the ph value greater than 7 will cause terrible corrosion. If the method is not adopted, fouling will form in the evaporator and the mold, which will act as heat insulation. When severe, the energy conversion effect will be reduced by 30%. Obviously this requires thinking about the softening of hard water. The most effective way is to equip an electronic hard water softener in the system. Such a softener is planned to be manufactured based on the principle of exchange. Depending on the flow rate, different standard softeners can be equipped, and they can be directly connected to the circulating water pipeline. 一般的, the cost of installing a water treatment softener will not be too high. It can also participate in a certain amount of deduction in the circulating system for a certain period of time. Scale agent.

Five, ice water machine flow and pressure

一般的, the injection molding mold is cooled, and the ice water pressure can be selected from 0.1 to 0.2mpa, and the request can be satisfied, and the microcomputer full-function chiller can satisfy this request. When the pressure request is higher than 0.2mpa, another plan is required to facilitate the selection of the corresponding pressure From the water pump to meet the needs of the system water supply.

Cooling of hydraulic oil and barrel feeding section

一般的, the hydraulic oil and barrel feeding section use cooling water tower water to cool, because this is not only the best way, it is cost-effective, but also very economical. Unless there are specific requirements for its temperature, ice water can be used for it. Cool down.

VII. Insulation of ice water pipes

The ice water pipeline must be insulated, because the pipeline insulation can not only prevent the severe loss of cold capacity, but also prevent the condensation formed on the outer wall of the pipe. 例えば: the temperature of ice water is 10℃, the ambient temperature is 30℃, the heat radiation of a 25-meter-long metal pipe with a surface area of 25m2 can reach 750kcal/h, which is almost 10% of the cooling capacity of a 3hp compressor, 5hp The compressor produces 6% of the cooling capacity.

The connection between the chiller and the plastic mold is generally selected to be connected with a reinforced hose. Since such a hose has the function of heat insulation, but the length exceeds 5m, it is necessary to consider appropriate heat preservation and heat insulation. In the application of the chiller, it is closely related to another equipment, あれは, the injection molding machine. Since it is so relevant, how to choose an injection molding machine, let us introduce you:

How to choose a chiller and an injection molding machine?

The domestic vertical and horizontal injection molding machines are matched when the cooling water condensation temperature of the water-cooled chiller is below 35 度 (the condensation temperature of the air-cooled chiller is below 43 度) when the domestic vertical and horizontal injection molding machines are used at normal ambient temperature.

The first method:

The 1hp water-cooled chiller can be equipped with an 80-ton clamping force injection molding machine with a temperature control of 5-10 度;

The 1hp water-cooled chiller can be equipped with a 100-ton clamping force injection molding machine with a temperature control of 10-15 度;

The 1hp water-cooled chiller can be equipped with a 120-ton clamping force injection molding machine with a temperature control of 15-20 度;

(The matching of the air-cooled chiller is 0.8 times that of the water-cooled chiller, あれは, the 1HP air-cooled chiller can be equipped with a 64-ton injection molding machine with a clamping force. The temperature is controlled at 5-10 degrees.)

The second method:

The 1HP water-cooled chiller can be equipped with an injection molding machine with a single injection volume of 10QZ, and the temperature is controlled at 5-10 度.

Injection volume 1QZ=28.5g

The above formula is the result summarized by the thoughts. In addition to using the above formula, the salesperson should consider the actual situation and select the appropriate chiller.