High-speed arc discharge, flushing and rotating main shaft device

Abstract

The invention discloses a high-speed arc discharge, flushing and rotating main shaft device which comprises a mandrel, a shell, a conductive bearing, a conductive disc, an insulating bearing, an insulating flange, a belt wheel, a rotating connector and the like. A main shaft structure capable of rotating, discharging and flushing is given to achieve the purposes of circulating and supply of high-pressure fluid, rotating and conducting, and the problems of discharge corrosion and the like are solved. According to the high-speed arc discharge, flushing and rotating main shaft device, the light-weight design that the insulating bearing is matched with the mandrel in a supporting mode is adopted, the rotating speed of a main shaft is increased, the accuracy of the main shaft is improved, and the insulating reliability of the main shaft is enhanced; the hollow mandrel structure is combined with the rotating connector to achieve the purposes of high-pressure fluid supply and sealing; the rotating conducting defect that overcurrent capacity of an electric brush is limited, or the rotating speed of a conductive sliding ring is low, or a structure is enormous and complex is overcome; the rotating conducting difficulty is lowered to the maximum degree, and the cost is lowered to the maximum degree. The high-speed arc discharge, flushing and rotating main shaft device is simple in structure, convenient to maintain, low in maintaining cost and capable of being effectively used for various discharging milling including electric arc machining.

Description

technical field [0001] The invention belongs to the field of electric discharge machining equipment, in particular to a high-speed electric arc discharge flushing rotary spindle device. Background technique [0002] High-speed arc discharge uses the discharge between the workpiece and the tool electrode to form an arc plasma, supplemented by high-pressure fluid to remove the molten workpiece material, and realizes the efficient removal of various difficult-to-cut metal materials (see literature W.Zhao, L.Gu, H.Xu , et.al.A novel high efficiency electrical erosion process--Blasting erosion arc machining[c].Procedia CIRP 6(2013)621-625). [0003] High-speed arc discharge milling uses a tool electrode with a simple shape to feed according to a set trajectory. At the same time, high-pressure fluid is passed through the flushing hole on the tool electrode, and a voltage is applied between the tool electrode and the workpiece. When the distance is close to a certain extent, the f...

AI Technical Summary

Problems solved by technology

The existing method is to use a special rotary flushing mechanism (see patent application document CN201310541512.4), and connect the mechanism to the main shaft of the machine tool through an insulating medium. This mechanism can realize the rotation, flushing and conductive functions of the electrode, but There is a certain error in the connection between it and the main shaft of the machine tool, which may easily cause the electrode beating to be out of tolerance, and the high-pressure fluid is supplied through the pipes on both sides to enhance the flushing disorder. The brush power supply is converted into the rotating power supply of the electrode, and the bearing is easily damaged due to assembly error, seal failure and discharge between the ball and the inner ring and outer ring, which in turn causes the loss of rotation accuracy, so its service life is short

[0005] In order to completely solve the above problems, it is necessary to design a new spindle system, which can install the tool electrode and drive the electrode to rotate, and the high-pressure flushing fluid can be passed through the spindle to directly infuse the fluid on the tool electrode through the spindle. , it is necessary to have a conductive device that converts the fixed electric bolt (the power supply is powered by conduction, and the power supply wire cannot follow the rotation of the electrode) into the rotational movement of the electrode

It should be noted that brush conduction is commonly used in the existing rotating conduction methods, but the brush conduction has a limited overcurrent capacity and is suitable for contact conduction with small currents. In addition, there are various types of conductive slip rings, such as special slip rings for high-current wind power Slip rings, mercury conductive slip rings, etc. This type of slip ring can pass a large current (such as 500A or above), but its use speed is extremely low (such as the common 100-200rpm), and it is difficult for thousands of revolutions required by high-speed arc discharge. every minute

If a special high-speed slip ring mechanism is developed, a large number of contact cores are required to realize current conduction, and better conductive materials are required to reduce contact resistance to prevent contact point discharge corrosion, and for passing a current such as 500A or more, its volume is huge , bulky structure, high development cost

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