High-frequency power supply circuit of wire cut electrical discharge machining tool

Abstract

The utility model discloses a high-frequency power supply circuit of a wire cut electrical discharge machining tool. Comprising an MOS tube semiconductor switch A1, an MOS tube semiconductor switch A2, an MOS tube semiconductor switch B1, an MOS tube semiconductor switch B2, an MOS tube semiconductor switch B3, an MOS tube semiconductor switch E1, an MOS tube semiconductor switch E2, a high-speed diode D1, a high-speed diode D2, a high-speed diode D3, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, an inductance coil X, an electric spark discharge gap SG and a main voltage DC. The method has the beneficial effects that the machining precision and efficiency can be improved; unique output characteristics are realized; and accurate control and monitoring can be realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of wire cut electrical discharge machine, concretely relates to a wire cut electrical discharge machine high frequency power supply circuit. BACKGROUND

[0002] In the field of modern manufacturing, as a kind of key processing equipment, wire cut electrical discharge machine is widely used in mould manufacturing, aerospace parts processing, precision machinery and many other industries, and plays a decisive role in the machining precision and surface quality of workpiece.However, the current supporting power supply technology has many limitations, which seriously restricts the further improvement of processing technology.

[0003] Although the traditional machine tool power supply can output narrow pulse, the power bottleneck is difficult to break through.In the face of large thickness workpiece processing, due to the increase of material resistance, the lengthening of discharge channel and other factors, the power supply needs to have stronger energy output capacity to maintain stable discharge, and the existing low-power narrow pulse power supply cannot provide sufficient electric energy, resulting in extremely low processing efficiency, and even unable to complete the cutting process normally.Moreover, in the fine machining stage, the conventional power supply is difficult to output accurate narrow pulse, resulting in high surface roughness of workpiece, which cannot meet the strict requirements of high-precision mould, high-end parts and other surface finish.

[0004] In addition, during the discharge machining process, electrolysis has always been a difficult problem in the industry.Most power supplies lack effective response mechanism, so that the workpiece surface is easy to form electrolytic layer during discharge.For some materials with high hardness and strong wear resistance, such as hard alloy and high-strength alloy steel, the electrolytic layer will greatly weaken the surface performance of the material, reduce its wear resistance, not only shorten the service life of the workpiece, but also increase the cost of post-processing process.Furthermore, the existing power supply is seriously insufficient in pulse control flexibility, cannot dynamically adjust pulse parameters according to different materials and different processing stages, and is difficult to realize fine control of the machining process, which greatly limits the application expansion of wire cut electrical discharge machine in complex process scenarios.

[0005] In summary, the manufacturing industry urgently needs a wire cut electrical discharge machine power supply that can output high power, nanosecond narrow pulse, effectively suppress electrolysis and have flexible pulse control capability. UTILITY MODEL CONTENT

[0006] To solve the above problems, especially for the deficiencies of the prior art, the utility model provides a wire cut electrical discharge machine high frequency power supply circuit to solve the above problems.

[0007] To achieve the above purpose, the utility model adopts the following technical means:

[0008] A kind of high-frequency power supply circuit of wire cut electrical discharge machine, including MOS tube semiconductor switch A1, MOS tube semiconductor switch A2, MOS tube semiconductor switch B1, MOS tube semiconductor switch B2, MOS tube semiconductor switch B3, MOS tube semiconductor switch E1, MOS tube semiconductor switch E2, high-speed diode D1, high-speed diode D2, high-speed diode D3, capacitor C1, capacitor C2, capacitor C3, capacitor C4, inductive coil X, spark gap SG, main voltage DC;

[0009] One end of the MOS tube semiconductor switch A1, MOS tube semiconductor switch A2, high-speed diode D1 is connected with the one end of high-speed diode D3 respectively, the other end of high-speed diode D3 is connected with the one end of inductive coil X;

[0010] The MOS tube semiconductor switch B3, capacitor C1, capacitor C2, capacitor C3, one end of spark gap SG is connected with the other end of inductive coil X respectively, the other end of capacitor C1 is connected with the one end of MOS tube semiconductor switch B1, the other end of capacitor C2 is connected with the one end of MOS tube semiconductor switch B2;

[0011] The MOS tube semiconductor switch E1, MOS tube semiconductor switch E2, high-speed diode D2, one end of capacitor C4 is connected with the other end of spark gap SG respectively;

[0012] The other end of the MOS tube semiconductor switch B1, MOS tube semiconductor switch B2, MOS tube semiconductor switch B3, MOS tube semiconductor switch E1, MOS tube semiconductor switch E2, high-speed diode D1, capacitor C3, capacitor C4 is connected with the one end of main voltage DC respectively;

[0013] The other end of the MOS tube semiconductor switch A1, MOS tube semiconductor switch A2, high-speed diode D2 is connected with the other end of main voltage DC respectively;

[0014] Current sensor M is connected on the connection circuit of the one end of spark gap SG.

[0015] The beneficial effects of the utility model are as follows:

[0016] 1, the utility model can promote processing precision and efficiency, the high-frequency power supply circuit of the utility model can effectively solve the roughness problem of cutting workpiece surface, improve size precision, significantly promote processing efficiency, especially for the workpiece of large thickness, make up the defect of low efficiency in fine machining of traditional discharge power supply.

[0017] 2, The utility model discloses a unique output characteristic. Can output high -power, nanosecond level narrow pulse, can also export negative pulse or control not to export negative pulse according to demand simultaneously. Among them, narrow pulse can make the surface of the processed part more smooth, because in the spark discharge machining process, the narrower the pulse, the lower the surface roughness of the processed workpiece, and the circuit can realize nanosecond level narrow pulse output (such as the smaller the capacitor C3, the narrower the pulse) through adjusting relevant capacitor and other elements;The function of negative voltage is to prevent electrolysis phenomenon on the workpiece surface during finish machining, avoid forming electrolytic layer on the workpiece surface, because the electrolytic layer is relatively soft, will lead to the wear resistance of the part to decline and the problem such as the discoloration of part of material after electrolysis, the negative pulse function of the utility model effectively overcomes these disadvantages, further guarantees the processing quality.

[0018] 3, The utility model discloses can accurate control and monitor. In every time to electric spark discharge gap SG discharges, current sensor M can accurately measure the size of each pulse, thereby facilitating accurate control to machine tool, realizes better processing effect. ACCURACY

[0019] Figure 1 It is the circuit diagram of the utility model. CONCRETE IMPLEMENTING METHOD

[0020] The technical scheme of the utility model will be described below in conjunction with the drawings, obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiment. Based on the embodiment in the utility model, all other embodiments obtained by the ordinary skill in the art without making creative labor belong to the scope of the utility model protection.

[0021] EMBODIMENT

[0022] As Figure 1 Shown, a kind of wire-cut electrical discharge machine high-frequency power supply circuit, including MOS transistor semiconductor switch A1, MOS transistor semiconductor switch A2, MOS transistor semiconductor switch B1, MOS transistor semiconductor switch B2, MOS transistor semiconductor switch B3, MOS transistor semiconductor switch E1, MOS transistor semiconductor switch E2, high-speed diode D1, high-speed diode D2, high-speed diode D3, capacitor C1, capacitor C2, capacitor C3, capacitor C4, inductor coil X, electric spark discharge gap SG, main voltage DC;

[0023] MOS transistor semiconductor switch A1, MOS transistor semiconductor switch A2, high-speed diode D1 one end is connected with the other end of high-speed diode D3 respectively, the other end of high-speed diode D3 is connected with one end of inductor coil X;

[0024] The other end of the inductor coil X is connected with the MOS transistor semiconductor switch B3, the capacitor C1, the capacitor C2, the capacitor C3 and one end of the electric spark discharge gap SG respectively, the other end of the capacitor C1 is connected with one end of the MOS transistor semiconductor switch B1, the other end of the capacitor C2 is connected with one end of the MOS transistor semiconductor switch B2;

[0025] The other end of the inductor coil X is connected with the MOS transistor semiconductor switch B3, the capacitor C1, the capacitor C2, the capacitor C3 and one end of the electric spark discharge gap SG respectively, the other end of the capacitor C1 is connected with one end of the MOS transistor semiconductor switch B1, the other end of the capacitor C2 is connected with one end of the MOS transistor semiconductor switch B2;

[0026] The other end of the inductor coil X is connected with the MOS transistor semiconductor switch B3, the capacitor C1, the capacitor C2, the capacitor C3 and one end of the electric spark discharge gap SG respectively, the other end of the capacitor C1 is connected with one end of the MOS transistor semiconductor switch B1, the other end of the capacitor C2 is connected with one end of the MOS transistor semiconductor switch B2;

[0027] The other end of the inductor coil X is connected with the MOS transistor semiconductor switch B3, the capacitor C1, the capacitor C2, the capacitor C3 and one end of the electric spark discharge gap SG respectively, the other end of the capacitor C1 is connected with one end of the MOS transistor semiconductor switch B1, the other end of the capacitor C2 is connected with one end of the MOS transistor semiconductor switch B2;

[0028] The electric spark discharge gap SG is connected with the current sensor M.

[0029] The power supply circuit has three adjustable pulse width functions, and specifically as follows:

[0030] The first gear: the MOS transistor semiconductor switch B1 is opened, the capacitor C1 is connected to the inductor loop to start working, the capacitor C1 has a large value, and a wide pulse is output; the inductor coil X accumulates wide pulses through multiple charging and discharging, and the circuit can output narrow pulses or wide pulses which can be set at will;

[0031] The second gear: the MOS transistor semiconductor switch B1 is closed, and the MOS transistor semiconductor switch A1, the MOS transistor semiconductor switch A2, the MOS transistor semiconductor switch B2, the MOS transistor semiconductor switch B3, the MOS transistor semiconductor switch E1 and the MOS transistor semiconductor switch E2 are opened; at this time, the main voltage DC charges the inductor coil X through the MOS transistor semiconductor switch A1, the MOS transistor semiconductor switch A2, the inductor coil X and the MOS transistor semiconductor switch B3, and the inductor coil X is charged for a set time and then the B3 is closed; at this time, a high voltage is generated at the lower end of the inductor coil X to charge the capacitor C2 and the capacitor C3, and the electric spark discharge gap SG is discharged;

[0032] The third gear: close MOS transistor semiconductor switch B1 and MOS transistor semiconductor switch B2, and open MOS transistor semiconductor switch A1, MOS transistor semiconductor switch A2, MOS transistor semiconductor switch B3, MOS transistor semiconductor switch E1 and MOS transistor semiconductor switch E2 at the same time. At this time, the current passes through MOS transistor semiconductor switch A1, MOS transistor semiconductor switch A2, inductor coil X, MOS transistor semiconductor switch B3 to charge inductor coil X, and after a set time, MOS transistor semiconductor switch B3 is closed, a high voltage is generated at the lower end of inductor coil X to discharge spark gap SG, and the current passes through MOS transistor semiconductor switch E1, MOS transistor semiconductor switch E2 and high-speed diode D1 to return to the other end of inductor coil X. If a reverse voltage is needed, MOS transistor semiconductor switch E1 and MOS transistor semiconductor switch E2 are closed within a set time, at this time, inductor coil X continues to discharge to charge capacitor C4, and after inductor coil X discharges, MOS transistor semiconductor switch B3 is opened, the current of capacitor C4 passes through spark gap SG and MOS transistor semiconductor switch B3 to return to the negative pole of capacitor C4, thereby forming a reverse current for spark gap SG.

[0033] In practical application in the wire-cut electrical discharge machine, the high-frequency power supply circuit device is built according to the above-mentioned circuit connection mode, the main voltage DC is connected, and three-gear pulse width adjustment is realized by controlling different opening and closing states of MOS transistor semiconductor switches according to processing requirements. For example, when constant current output or constant current short pulse is needed, the first gear can be switched to; if specific pulse discharge and charging process are needed to obtain corresponding processing effect, the second gear or the third gear is selected, and parameters such as waiting time are reasonably set according to actual processing conditions. In the whole processing process, the current sensor M monitors the pulse current size in real time, and feeds back to the machine tool control system, so as to dynamically adjust and optimize the processing process, so as to fully exert the advantages of the high-frequency power supply circuit, and realize high-quality wire-cut electrical discharge machining.

[0034] The examples made by the utility model are not the limitation of the embodiments. For ordinary skilled in the art, other different forms of changes or changes can be made on the basis of the above description, and all the embodiments do not need to be exhausted, and the obvious changes derived therefrom are still within the protection scope of the utility model.

Claims

1. A high-frequency power supply circuit for wire-cut electrical discharge machine, characterized by, MOS transistor semiconductor switch A1, MOS transistor semiconductor switch A2, MOS transistor semiconductor switch B1, MOS transistor semiconductor switch B2, MOS transistor semiconductor switch B3, MOS transistor semiconductor switch E1, MOS transistor semiconductor switch E2, high-speed diode D1, high-speed diode D2, high-speed diode D3, capacitor C1, capacitor C2, capacitor C3, capacitor C4, inductor X, electric spark discharge gap SG, main voltage DC; One end of the MOS transistor semiconductor switch A1, MOS transistor semiconductor switch A2, high-speed diode D1 is connected with one end of high-speed diode D3 respectively, the other end of high-speed diode D3 is connected with one end of inductor X; The MOS transistor semiconductor switch B3, capacitor C1, capacitor C2, capacitor C3, one end of electric spark discharge gap SG is connected with the other end of inductor X respectively, the other end of capacitor C1 is connected with one end of MOS transistor semiconductor switch B1, the other end of capacitor C2 is connected with one end of MOS transistor semiconductor switch B2; The MOS transistor semiconductor switch E1, MOS transistor semiconductor switch E2, high-speed diode D2, one end of capacitor C4 is connected with the other end of electric spark discharge gap SG respectively; The other end of MOS transistor semiconductor switch B1, MOS transistor semiconductor switch B2, MOS transistor semiconductor switch B3, MOS transistor semiconductor switch E1, MOS transistor semiconductor switch E2, high-speed diode D1, capacitor C3, capacitor C4 is connected with one end of main voltage DC respectively; The other end of MOS transistor semiconductor switch A1, MOS transistor semiconductor switch A2, high-speed diode D2 is connected with the other end of main voltage DC respectively; The electric spark discharge gap SG one end of the connection circuit is connected with current sensor M.

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