First, the extrusion casting process and equipment application status quo
Squeeze casting technology invented 65 years, it has a strong technical advantages, has been attached to the machinery manufacturing process industry. Unfortunately, by the traditional way of thinking and equipment development lag behind the constraints, the advantages of extrusion casting has not been the most fully demonstrated. The current extrusion casting process is basically carried out by open casting vertical extrusion, and the highest efficiency of the horizontal cold chamber die casting process failed to achieve compatibility. In recent years, the development of vertical closed mold filling casting, and 40 years ago invented the "fine, fast, dense" die-casting principle, are to shrink the body to compensate, the nominal pressure is limited, did not reach the squeeze Pressure casting made by the proportion of pressure requirements, strictly speaking, can not be counted as a true sense of the extrusion casting.
Compared with the die-casting technology, the existing extrusion casting equipment efficiency is not high, parts forming the size of low precision, the cost is relatively high. Due to the low degree of automation equipment, the skills of workers demanding, more difficult to operate, high labor intensity. The same parts, squeeze casting process shop costs about 2 - 3 times the die - casting process. Coupled with the injection system is imperfect, complex parts of the structure is difficult to produce, limiting the extensive application of extrusion casting process.
Extrusion casting process to promote the application of the problems, is due to the development of equipment lag. At present, the traditional crushing process and equipment, the biggest crux is that it can not really combine with the injection system of the traditional die casting device. The combination of mold clamping, mold clamping and extrusion is a key problem. Do not break this point, squeeze casting process potential can not fully play out of its traditional die-casting process of alternative advantages will be difficult to fully express, the traditional die-casting technology can not take this technology to a leap to a new level.
Second, in the traditional die-casting machine on the application of extrusion die-casting process advantages
The traditional die-casting process and equipment technology has been quite perfect, especially the horizontal cold chamber die-casting machine and horizontal die-casting process, its injection and clamping mold clamping device, with strong process adaptability. Therefore, the extrusion casting process if it can not be combined with the traditional die-casting equipment, will constrain its wide range of applications. Take this step, extrusion casting technology will appear another branch, which is squeeze die casting technology. In other words, in the traditional die-casting machine based on the application of extrusion casting technology, is the extrusion die-casting technology. According to the characteristics of extrusion die casting process, the traditional die-casting machine to improve the corresponding transformation, this equipment is a new extrusion die-casting machine.
1. Correct and comprehensive understanding of the die-casting process and the traditional die-casting machine function
Grasp the principle of extrusion casting process, in the traditional die-casting machine on the simple application of extrusion die-casting process is not difficult, the key is to break the traditional concept. It needs the traditional die-casting machine owned by the performance of a comprehensive full understanding, but also on the traditional die-casting process has a profound understanding, but also to clear those preconceived fuzzy understanding.
In fact, the current traditional die-casting machine, its function has been quite complete, it can not only ordinary die-casting, but also for extrusion die casting, with die extrusion die casting; not only for a variety of low-pressure casting, Gravity casting, increase the vacuum device, but also for vacuum suction, vacuum die-casting, vacuum extrusion die-casting. If the idea to release a little, semi-solid processing, die forging technology combined with the formation of continuous casting and forging process, but also can be effectively achieved.
There are many models of die-casting machine, the injection system of the injection force, injection speed are "continuous stepless adjustable". On the low-pressure casting, differential casting, gravity casting process characteristics, in the ordinary die-casting machine on the above process is no problem. The installation of this mold on a die-casting machine is not as costly as people think, because it is not necessarily as complex as a conventional die-casting mold. Unfortunately, in practice we are difficult to see the relevant applications and reports. This is our traditional die-casting machine and the traditional die-casting process of a misunderstanding, misunderstanding and application errors.
2. The characteristics of traditional die-casting process and equipment and the adaptability of extrusion die-casting process
Conventional die-casting machine is divided into two categories, one is the total hydraulic cylinder (lock) die casting machine, the other is the elbow mechanism die-casting die casting machine. Due to the low cost of manufacturing equipment for the clamping mechanism, the market is now dominated by such models.