JPH052815U - Power supply for electrical discharge machining - Google Patents

Abstract

(57) [Abstract] [Purpose] For improving the cooling effect in a power supply device for electrical discharge machining. [Structure] The input / output section and the part excluding the entry / exit of the wiring path to the work piece or the electrode are configured by a multilayer printed board, and the case shapes of the switching element and the rectifying element mounted on the multilayer printed board are molded. The case type was used, and the heat dissipation part was arranged on the same plane of the single cooling fin via the insulating sheet. [Effect] Since the heat radiating portions of the switching element and the rectifying element are mounted on the same plane of the cooling fin, the assembling property is improved, and the cooling fin is not required to be machined, so that the cooling area becomes large and the cost and the cooling are reduced. The effect is greatly enhanced and the size can be reduced.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a power supply device for electric discharge machining suitable for improving a cooling effect.

[0002]

[Prior Art]

 FIG. 6 is a circuit diagram showing a conventional power supply device for electric discharge machining. In the figure, E1 is a DC power supply for supplying energy for processing a workpiece P which is an electrode on the positive electrode side, Q1 and Q2 are switching transistors, D1 and D2 are diodes, C1 and C2 are capacitors for snubber circuits, C3-1 and C3-2 are capacitors for busbars, GA1 and GA2 are driving circuits for switching transistors Q1 and Q2, and PG is a pulse signal at a predetermined cycle. Output pulse generator, L1 and L2 are wiring inductances, R1 and R2 are wiring resistances, and N is a negative discharge electrode.

Next, the power supply device will be described. 7 to 14 show an embodiment showing the configuration of a power supply device for electric discharge machining. 7 is a cross-sectional view taken along the line BB in FIG. 8, and FIG. 10 is a cross-sectional view taken along the line A-A in FIG. The configuration shown in the figure is switching transistors Q1 and Q2, diodes D1 and D2, capacitors C1 and C2 for snubber circuits, capacitors C3-1 and C3-2 for busbars, multi-layer printed circuit board 1, cooling fins 2-1, 2-2. , 2-3, connection line 5-1 connects between the drain D and n of switching transistor Q2, and similarly, connection line 5-2 connects between drain D of switching transistor Q1 and f, and connection line 5-3 The connection line 5 -4 is connected between the anode A of the diode D1 and (-), the cathode K and P of the diode D1 and the connection line 5-5 is connected between the diode D2 cathode K and (+). In addition, the case side of the switching transistors Q1 and Q2 is the drain terminal shown in A in FIG. 9 (shape is TO-3 type FIGS. 11 and 12), and the case side of the diodes D1 and D2 is shown in C in FIG. 9 (screw). Part) is an anode terminal (the shape is a stud type, FIG. 13 and FIG. 14). Therefore, the cooling fins 2-1, 2-2, 2-3 are divided into three with an insulation distance (see FIG. 6) due to the connection relationship between the switching transistors Q1, Q2 and the diodes D1, D2. Also, the fin side is cut off because it is formed as a conductive path by connecting the cooling fins 2-1, 2-2, 2-3 to the case sides of the switching transistors Q1, Q2 and the diodes D1, D2. It is installed.

[0004]

[Problems to be solved by the device]

 Since the conventional power supply device for electric discharge machining is configured as described above, a connection line is required between the cooling fins 2-1, 2-2,2-3, switching transistors Q1 and Q2, and diodes D1 and D2. In addition, since the cooling fins are used as conductive paths, it is necessary to divide the cooling fins into three to insulate the cooling fins from each other, as is clear from the circuit diagram configuration of FIG. Since the shape of the diodes D1 and D2 is processed to connect to the cooling fin, the cooling effect is poor, the connecting wire is complicated, the cost increases, and the reliability decreases due to the increase in the number of parts. There were challenges.

The present invention has been made to solve the above-mentioned problems, and achieves cost reduction by reducing the number of parts of the device, has an excellent cooling effect, and is highly reliable for electrical discharge machining. The purpose is to obtain a power supply.

[0006]

[Means for Solving the Problems]

 A power supply device for electric discharge machining according to the present invention is provided on at least one of a work piece and a wiring path to an electrode, and controls the voltage supplied from a DC power source to switch the work piece and the electrode. A switching element that applies a pulse voltage to the machining gap formed in 1., one of which is connected to either the work piece or the electrode, and the other of which is connected to either terminal of the DC power supply. In a power supply device for electrical discharge machining that includes at least one rectifying element that recirculates the counter electromotive force generated in the path, the input / output section of the DC power supply and the input / output section of the wiring path to the workpiece or electrode. The part except the output part is composed of a multilayer printed circuit board, and the case shape of the switching element and the rectifying element mounted on the multilayer print board is the molded case type (eg Using the T0-3P] radiator unit in which (usually the case surface) consisting arrangement arranged on the same plane of the cooling fins of a single (common) through a insulating sheet (plate).

[0007]

[Action]

 According to this invention, the case shape of the switching transistor and the diode is a mold case type (for example, TO-3P), and the heat dissipating part is mounted on the same plane of the single (common) cooling fin through the insulating sheet. It does not require the processing of, and the cooling area becomes large. In addition, the cooling fin is used alone (no need for many types of cooling fins), and the connecting wire is not required.

[0008]

【Example】

 Example 1. An embodiment of the present invention will be described below with reference to the drawings. Figure 1 shows the case shape of the switching transistor and diode mounted on the multi-layered printed circuit board, which uses a molded case type (for example, TO-3P Fig. 3 to 5) shown in Fig. 2 with the heat radiating part being an insulating sheet. FIG. 6 is a component layout diagram showing a configuration in which a single (common) cooling fin 2 is mounted on the same plane via 6;

Note that, as the insulating sheet, for example, if a silicon-based high-performance sheet having a low thermal resistance (thermal resistance = about 0.2 to 0.4 ° C./W), which has recently been released by a manufacturer, is used, the cooling effect is further enhanced.

[0010]

[Effect of the device]

 As described above, according to the present invention, the case shape of the switching transistor and the diode is a mold case shape (for example, TO-3P), and the heat radiating portion is on the same plane of the single (common) cooling fin through the insulating sheet. Since it is mounted on the top, the assemblability is improved, and it is not necessary to process the cooling fins, the cooling area is large, the cost is reduced, the cooling effect is greatly enhanced, and the size can be reduced.

[Brief description of drawings]

FIG. 1 is a component layout view showing the configuration of a power supply device for electric discharge machining according to an embodiment of the present invention.

FIG. 2 is a component layout view showing the configuration of a power supply device for electric discharge machining according to an embodiment of the present invention.

FIG. 3 is a view showing a shape of a mold case according to an embodiment of the present invention.

FIG. 4 is a view showing the shape of a mold case according to an embodiment of the present invention.

FIG. 5 is a view showing the shape of a mold case according to an embodiment of the present invention.

FIG. 6 is a circuit diagram of a conventional power supply device for electric discharge machining.

7 is a cross-sectional view taken along the line BB in FIG. 8 of the related art.

FIG. 8 is a conventional component layout diagram.

FIG. 9 is a conventional component layout.

10 is a cross-sectional view taken along the line AA in FIG. 8 of the related art.

FIG. 11 is a diagram showing a conventional drain terminal.

FIG. 12 is a diagram showing a conventional drain terminal.

FIG. 13 is a view showing a conventional anode terminal.

FIG. 14 is a diagram showing a conventional anode terminal.

[Explanation of symbols]

 1 Multilayer printed circuit board 2 Cooling fins 5 Connection wire 6 Insulation sheet

Claims (1)

[Claims for utility model registration] [Claim 1] The workpiece and the electrode are provided on at least one of the wiring path to the workpiece and the electrode, and control the switching of the voltage supplied from the DC power source. A switching element for applying a pulse voltage to the machining gap formed by the above, and one of which is connected to either the workpiece or the electrode and the other of which is connected to either terminal of the DC power supply, In a power supply device for electric discharge machining comprising at least one rectifying element that recirculates a counter electromotive force generated in a path, an input / output section of a DC power supply and an input / output section of a wiring path to a workpiece or an electrode are provided. The removed part is composed of a multi-layer printed circuit board, and the case shape of the switching element and rectifying element mounted on the multi-layer printed circuit board is a molded case type. A power supply device for electric discharge machining, characterized in that the heat section is arranged on the same plane of a single cooling fin via an insulating sheet.