Injection device for casting device and casting method

Abstract

A casting device is provided with an injection device and a vacuum device and is characterized in that the injection device is formed from a sleeve having suction openings for connecting to a vacuum device and an injection plunger, the vacuum device is formed from a suction opening selection valve capable of selecting to use or not to use vacuum suction, a pressure tank for air blowing to clean asuction pathway, and a vacuum tank for forming a vacuum within the sleeve, and the sleeve is formed from a plurality of suction openings.

Description

technical field [0001] The present invention relates to an injection device for a casting device used in the manufacture of die-cast products, and a casting method using the injection device. Background technique [0002] In the case of producing castings made of light metal alloys, a die casting method, which is a method of pressurizing and filling a molten material (melt solution) into a mold, is often used. The die-casting method has high productivity because the melt in the injection sleeve (hereinafter, the injection sleeve is referred to as “sleeve”) is filled into the mold at high speed, and large and thin products can be manufactured. Moreover, it has the advantages of being able to produce products with high dimensional accuracy, fine casting structure and fine casting surface. On the other hand, since the melt is filled at a high speed, air is easily entrapped and blow holes (hole-shaped defects generated in castings) are easily generated. [0003] In recent year...

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Problems solved by technology

[0008] (3) When the position of the suction port on the side of the sleeve is inappropriate for filling the melt

[0009] Furthermore, in the prior art of the above-mentioned Patent Document 1, there is only one suction port on the sleeve side, and if clogged with dross of the melt, the pressure cannot be sufficiently reduced, resulting in an increase in defects.

Since there is one suction port on the side of the sleeve, it is necessary to manufacture a sleeve with the suction port on the side of the sleeve at an optimal position according to the amount of melt supply, and the versatility is not good.

Therefore, it is necessary to hold various sleeves as consumables according to molds and products, and the production cost of sleeves increases.

Moreover, when the mold is replaced, it is necessary to replace it with a sleeve corresponding to the mold, and the adjustment time increases, which increases the cost

[0010] Furthermore, in the prior art of the above-mentioned Patent Document 1, even if clogging with dross of the melt occurs and the suction area is reduced or closed, it cannot be detected as an abnormality.

Casting continues without sufficient decompression, resulting in continuous production of defective products

In addition, dross of the melt enters the vacuum line, and malfunction of the solenoid valve that turns the vacuum on and off may occur.

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