Electric heating – Metal heating – Cutting or disintegrating
Patent
1996-06-13
1998-05-19
Evans, Geoffrey S.
Electric heating
Metal heating
Cutting or disintegrating
B23H 710
Patent
active
057538794
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an electro-spark linear cutting machine, more particularly, to a self-spinning electro-spark linear cutting machine with large cutting range, high precision and high efficiency.
BACKGROUND ART
There are two types of conventional electro-spark linear cutting machine: one is of quick electrode wire traveling, whose speed is 6-12 meter/sec., and the other is of slow electrode wire traveling, whose speed is .ltoreq.250 mm/sec. The former has a high speed wire traveling, its chip removal is easier, the cutting speed is higher and can be used for cutting thicker workpiece, but its vibration is heavier, and also, its electrode wire is made of costly molybdenum, so it must be repeatedly used in to-and-fro movement, that leads to unilateral discharge and electrode wire distortion and in turn causes lower working precision and rougher working surface. Since the to-and-fro movement is very quick and the working time for one single trip is short (normally 10 to 20 sec. ), direction-change must be frequently made, but direction-change can leave marks on the working surface due to the working conditions change when direction-changing, that seriously influences the working surface fineness. The latter uses copper wire as its electrode wire which can be used only once, the working precision is high and the working surface fineness is much more improved, but its electrode wire traveling is slow and its chip removal is difficult, that have a serious effect on the workpiece permissible thickness and working speed, and also, in order to avoid wire breaking caused by pulling arc, the working precision of wire traveling device must be very high, that leads to the high cost of machine. Meanwhile, the wire can only be used once, that is a big waste.
Furthermore, the above two conventional linear cutting machines have one unsolvable common drawback, that is, the electrode wire, in both cases, moves from one end of the workpiece to the other, and the chip removal is also done from one end to the other, so with the thickness of the workpiece increasing, the chip removal path becomes longer. The thicker the workpiece is, the more difficult the chip removal is. It is likely to cause unstable working of the machine so that the wire breaks, and it is impossible to cut thicker workpiece. 400 mm is the maximum thickness of workpiece which can be cut by the various types of linear cutting machine available on the market.
DISCLOSURE OF THE INVENTION
The object of the present invention is to provide a new type of electro-spark linear cutting machine which can thoroughly overcome the above weakpoints of the conventional machines, namely slow speed, low precision and rough surface. The chip removal process is thoroughly changed through changing the mode of wire traveling of the conventional electrode wire traveling devices, namely, changing the mode of wire movement, by which the workpiece electro-spark cutting is achieved, from making a single linear movement to a combined movement--the wire moves linearly and at the same time rotates about its own axis at a high speed. This movement causes the process of chip removal to be thoroughly changed--the chip will be removed to the aft of working surface instead of to one end of workpiece, and the rate of chip removal will only depend on the rotation rate, not the workpiece thickness. Thus, the problem, that cutting thicker workpieces causes more difficulties and whereby makes the working performance degraded so that it is impossible to cut during the working process when using the conventional machines, is radically resolved, and the cutting thickness is greatly increased, the working is stable and the working speed is raised.
Another object of the invention is to provide a self-spinning linear cutting machine which has high linear cutting performance, one unit of which can be used for multi-purpose because of electrode rotation itself further having a function of digital control grinding and which also has a simple structure and low manufactu
REFERENCES:
patent: 5506382 (1996-04-01), Derighetti
Xu Lilin
Yang Xinsheng
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