Application of extrusion die casting process on ordinary die casting machine

The technical and economic energy contained in the extrusion Die Casting process is amazing. An equivalent-scale extrusion die-casting plant can reduce equipment investment by more than two-thirds compared to conventional die-casting plants, and its process adaptability can cover most of the casting molding except for Sand Casting. The introduction of extrusion die casting technology, the breakthrough in concept may be far more profound than the breakthrough of its own technology.

Extrusion die casting process and cutting of traditional die casting equipment

Taking the horizontal die-casting machine as an example, this traditional equipment can be applied to the extrusion die-casting process without the addition of new mechanical devices. It can also produce extruded die-casting parts, but the parts produced are slightly simpler, and the thickness and dimensional accuracy of the parts are limited. 

Since the traditional horizontal die casting machine does not have a special extrusion feeding mechanism, the clamping mechanism must simultaneously undertake the clamping and extrusion feeding functions. The extrusion die Casting Mold used must design the convex part of the entire part. It is essentially a "punch", similar to the mold used in open extrusion casting machines, and is one of the most traditional and typical extrusion casting mold structures.

Therefore, the application of the extrusion casting process on a conventional horizontal die casting machine requires control of the dimensional accuracy of the clamping. The easiest way to control the exact position of the mold clamping is through so-called "real-time control". By adding a "position electronically controlled" switch to the die casting machine, the logic circuit of the die casting machine is adjusted accordingly. The thickness accuracy of die castings is subject to the controllable precision of this "position electronically controlled switch". Through this improvement, the entire extrusion die casting process is very similar to the existing vertical closed mold (punch mold) back pressure filling and extrusion casting process.

Extrusion die-casting production with an ordinary horizontal die-casting machine, because it is a closed-die filling type, it can not only produce parts with complex structures than the traditional vertical extrusion casting machine, but also because the injection system is also four-column. The hydraulic casting machine has a more perfect extrusion casting machine. It can also produce more complicated parts than the vertical closed-die reverse pressure extrusion casting method, and its complex coefficient is the same as that of the traditional die-casting process.

The similarities and differences between the die-casting device of extrusion die-casting and the traditional die-casting die

A very different feature of the extrusion die casting process using a conventional horizontal die casting machine is its ejector. Conventional die-casting machines generally leave the blank in the moving mold, while the extrusion-casting process can be left in either the movable mold or the static mold. It has a decisive influence on the mold structure, mold bearing capacity and mold cost. Newly designed extrusion die casting machines must fully consider this issue.

It is worth noting that the extrusion die-casting mold undertakes high-pressure extrusion feeding, which has higher mechanical strength than the traditional die-casting mold. The bearing strength design should be carried out with reference to the design specifications of the forging die, and the required strength of the ejector rod is also Larger than traditional die-casting molds. To better solve the problem of the strength and rigidity of the extrusion die-casting mold, it is necessary to simplify the structure of the extrusion die-casting mold, which is to completely reform the traditional die-casting machine according to the extrusion die-casting process, or to apply a true extrusion die-casting machine. .

Third, the design of the new extrusion die-casting machine and the transformation of the traditional die-casting machine

There are two ways to modify the extrusion die casting machine on the basis of the traditional die casting machine:

First, the manufacturer of the die-casting machine, according to the characteristics of the extrusion die-casting process, design and produce a versatile extrusion die-casting machine with wide adaptability. According to the technical idea, the die-casting machine manufacturer designs and produces the extrusion die-casting machine with the same clamping force and extrusion force. The manufacturing cost of the whole machine is only about 3% higher than that of the ordinary die-casting machine. Specific improvement schemes can be referred to the introduction of patent documents related to this technology.

Second, the existing die-casting manufacturers have self-reformed their own die casting machines.

The transformation of the traditional full-hydraulic clamping die-casting machine is the extrusion die-casting machine, the cost is the lowest. As long as the clamping mechanism is added to the equipment, the cost is between 5,000 yuan and 10,000 yuan, and the tonnage of the equipment type is not the same. Big.

The toggle-type clamping die-casting machine can be modified in general machinery factories. The cost of retrofitting is generally around 5% of the value of the equipment. The elbow die casting machine with a clamping force of 500 tons was transformed into a squeeze die casting machine with a clamping force of 500 tons and an extrusion force of about 30,000 yuan.

The extrusion die-casting machine transformed from two different types of die-casting machines will have different extrusion die-casting mold structures, which is something designers should pay attention to. The characteristics of the extrusion die-casting mold will be introduced separately.

Fourth, the conclusion

The extrusion die-casting process and equipment technology have made the extrusion casting technology a step forward, but it is still a new thing, and it needs to be enriched and improved by the peers in practice.

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