KR100417076B1 - A method of vertically setting wire in a wire electric discharging machine - Google Patents

Abstract

PURPOSE: A method for setting the vertical position of a wire of a CNC(Computer Numerical Control) wire electric discharge machine is provided to obtain the vertical precision of a wire electrode and secure safety for operators by crossing a vertical jig and the wire electrode at the vertical angle with a contact sensing function and an electric discharging machining function of the electric discharge machine. CONSTITUTION: A method for setting the vertical position of a wire of a CNC wire electric discharge machine is composed of steps for conforming the contact sensing after deciding a vertical set axis(S1); moving back X and Y axes at a constant distance of a non-contacted state of a vertical jig and a wire electrode(S2); generating electric discharge pulse(S3); moving the X/Y axes(S4); deciding if the electric discharge is generated(S5); generating electric discharge pulses to the reference frequencies(S6); completing the process if the wire electrode reaches the electric discharge frequencies in the vertical position(S7); storing a value for counting the previous electric discharge frequencies if not reaching the electric discharge frequencies(S8); moving U/V axes at the constant degree(S9); generating the electric discharge pulse again to the reference frequencies(S10); counting the present electric discharge frequencies(S11); deciding if the present electric discharge count value is larger than the previous electric discharge count value(S12); and changing the moving direction of the U/V axes to the opposite direction if the present electric discharge count value is smaller than the previous electric discharge count value(S13).

Description

A method of vertically setting wire in a wire electric discharging machine}

The present invention relates to a wire vertical setting method of a wire electric discharge machine, and more particularly, to a vertical wire and vertical wire setting method of a vertical jig and a wire electrode to vertically process a workpiece.

In general, a wire discharge machine applies a pulsed voltage between a wire electrode such as fine copper or tungsten of 0.05 to 0.25 mm and a workpiece, generates an electrical discharge in a state where a processing liquid is interposed, and generates a workpiece by the discharge energy at this time. As an apparatus for processing, the contour of a specific shape is processed by giving a relative motion to the workpiece | work and the wire which is an electrode. At this time, the wire electrode has a stable discharge by maintaining a proper distance from the workpiece.

The conventional wire vertical setting method (Application No. 93-15181, Publication No. 95-5428) was to vertically set using the contact sensing function of the sample workpiece and the wire electric discharge machine. The conventional wire vertical setting method is by electrical contact, and the precision of vertical setting is affected by the edge contact characteristic of the sample workpiece. This affects the accuracy of the vertical setting of the edge dimensions of the sample workpiece and does not affect the vertical plane of the sample workpiece. Substantially, the corner portion is not only difficult to machine compared to the vertical surface, but also is easily worn by minor friction, and sharply processed for precision, there is a problem that the possibility of cutting the operator increases.

Accordingly, the present invention has been made to solve the above problems, by using the contact sensing function and the electric discharge machining function of the wire discharge processing machine to make the vertical jig and the wire electrode to be perpendicular to have a vertical precision of the wire electrode. Rather, to provide a wire vertical setting method of the wire electric discharge machine in consideration of the safety of the operator.

According to an aspect of the present invention, there is provided a method of vertically setting a wire of a wire electric discharge machine, including: a first step of determining an axis to be vertically set and confirming contact detection with the axis; A second step of retreating the X / Y axis by a predetermined distance in a non-contact state after the vertical jig and the wire electrode contact each other; Generating a discharge pulse; A fourth step of moving the X / Y axis; A fifth step of judging whether or not discharge has occurred, and branching to the third step if no discharge has occurred and proceeding to the next step if the discharge has occurred; A sixth step of generating discharge pulses for a reference number of times; A seventh step of determining whether the number of discharges when the wire electrode is in the vertical position has been reached, and if so, ending; An eighth step of storing the previous discharge count count value when the discharge count when the wire electrode is in the vertical position has not been reached as a result of the determination in the seventh step; A ninth step of moving the U / V axis by a predetermined amount; A tenth step of generating the discharge pulses by the reference number of times again; an eleventh step of counting a current number of discharges; A twelfth step of judging whether the count value for the current discharge count is greater than the count value for the previous discharge count, and branching to the seventh step if it is large; And as a result of the determination in the twelfth step, when the count value for the current discharge count is smaller than the count value for the previous discharge count, change the moving direction of the U / V axis in the opposite direction, and then go to the eighth step. It is characterized by consisting of a thirteenth step.

Performing the steps of the present invention sequentially can not only have the vertical precision of the wire electrode, but also consider the safety of the operator.

1 is a hardware configuration diagram of a wire electric discharge machine according to the present invention.

2 is a view schematically showing a process in which the vertical jig and the wire electrode is vertical.

Figure 3 is a flow chart for the wire vertical setting method of the wire electric discharge machining machine according to the present invention.

* Explanation of symbols for main parts of the drawings

10: numerical control means 12: discharge control means

14: discharge voltage supply means 16: motor drive means

18: discharge voltage detection means MTx: x-axis motor

MTy: y-axis motor MTu: u-axis motor

MTv: V axis motor CP: Vertical fixture

W: Wire electrode Tab: Processing table

WG: Wire Guide PH, PL: Power Pin

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a hardware configuration diagram of a wire electric discharge machine to which the present invention is applied. The wire electric discharge machine includes a numerical control means 10, a discharge control means 12, a discharge voltage supply means 14, a motor driving means 16, Discharge voltage detecting means 18, x-axis motor MTx, y-axis motor MTy, u-axis motor MTu, v-axis motor MTv, machining table Tab, vertical jig CP, wire electrode (W), wire guide (WG), and conductive pins (PH, PL). Here, the vertical jig has two faces facing each other as a cube.

The wire discharge machine applies a discharge voltage from the discharge voltage supply means 14 between the workpiece (a workpiece is used instead of a vertical jig at the time of processing) and the wire electrode, and the motor MTx, MTy, MTu, MTv) is a device using a discharge occurs at the time of insulation breakdown when the workpiece and the wire electrode is approached, the present invention also uses the discharge phenomenon by controlling the discharge voltage supply means 14 in the discharge control means 12 Weak discharge occurs, and because of this, the vertical jig is not processed and only a discharge phenomenon occurs. In more detail, each component block, the numerical control means 10 receives a command according to the machining program, outputs a numerical control signal, and receives the discharge voltage detection signal from the discharge voltage detection means 18 at a later stage. The discharge control means 12 receives the numerical control signal from the numerical control means 10 and outputs a discharge control signal, and the discharge voltage supply means 14 responds to the discharge control signal from the discharge control means 12. Accordingly, the discharge voltage is supplied between the vertical jig and the wire electrode. The motor driving means 16 receives the numerical control signal from the numerical control means 10 and drives the x-axis, y-axis, u-axis, and v-axis motors MTx, MTy, MTu, MTv. The discharge voltage detection means 18 detects the discharge voltage supplied between the vertical fixture and the wire electrode and outputs a discharge voltage detection signal to the numerical control means 10.

FIG. 2 is a view for schematically illustrating a process in which the ruler and the wire electrode are perpendicular to each other. The process is performed in order from a) to d). Here, d represents a predetermined distance in which the vertical jig and the wire electrode are not in contact with each other.

3 is a flow chart of a wire vertical setting method of a wire discharge machining machine according to the present invention. The method of the present invention will be described in each step as follows.

In the first step S1, the vertical jig and the wire electrode are moved to the axis determined by the operator to determine the axis to be vertically set, to control the numerical control means 10 and to operate the motor driving means 16 to set vertically. By approaching, the vertical jig and the wire electrode is detected and checked. In the second step (S2), after the vertical fixture and the wire electrode are in contact with each other, the motor driving means 16 is operated to retract the vertical fixture and the wire electrode on the X / Y axis by a predetermined distance d in a non-contact state. Then, it will be in the state as shown in (a) of FIG. Subsequently, in the third step S3, the discharge control means 12 is controlled by controlling the numerical control means 10 to generate a discharge pulse through the discharge voltage supply means 14, and the fourth step S4. In (), the motor driving means 16 is operated to move the vertical fixture and the wire electrode to the X / Y axis to approach again. In the fifth step S5, after determining whether discharge has been generated by the discharge voltage detecting means 18, and if discharge has not occurred, the process branches to the third step S3 to the third step S3 to The fourth step S4 is repeatedly performed, that is, the vertical jig and the wire electrode are approached by moving the X / Y axis until discharge occurs, and if discharge is generated, the process proceeds to the next sixth step S6. In the sixth step S6, when the discharge is generated as a result of the determination in the fifth step S5, the discharge pulse is generated as many times as the reference number through the discharge voltage supply means 14. In the seventh step S7, the number of discharges is determined by the numerical control means 10. The number of discharges detected by the discharge voltage detecting means 18 and applied to the numerical control means 10 is a wire electrode. When it is determined that the number of discharges in the vertical position has been reached, the vertical fixture and the wire electrode are in the vertical state, and thus the vertical position adjusting operation is finished. However, as a result of the determination in the seventh step S7, when the number of discharges when the wire electrode is in the vertical position has not been reached, in the eighth step S8, the previous number of discharges is counted in the numerical control means 10. Save the value. Subsequently, in the ninth step S9, the motor driving means 16 is operated to move the vertical fixture and the wire electrode to the U / V axis by a certain amount. In this case, the U-axis motor MTu (see FIG. 1) is the X-axis motor. (MTx: see FIG. 1) and the V-axis motor (MTv: see FIG. 1) is operated in the same direction as the Y-axis motor (MTy: see FIG. 1). In the tenth step S10, the discharge pulses are generated as many as the reference number of times through the discharge voltage supply means 14, and in the eleventh step S11, the current number of discharges is counted by the numerical control means 10. do. In the twelfth step S12, it is determined by the numerical control means 10 whether the count value for the current discharge count is greater than the count value for the previous discharge count, and if it is large, in the seventh step S7. It branches again to determine whether the number of discharges when the wire electrode is in the vertical position is reached again.

As a result of the determination in the twelfth step S12, when the count value for the current discharge count is smaller than the count value for the previous discharge count, the moving direction of the U / V axis is reversed in the thirteenth step S13. After changing to the direction, the process proceeds to the eighth step S8 and repeats the eighth step S8 to the twelfth step S12. As the above steps (S1 to S13) are sequentially performed, the vertical jig and the wire electrode are placed in the vertical position with each other as shown in FIG.

The embodiments described above are merely illustrative in all respects and should not be construed as limiting, and all modifications that fall within the true spirit and scope of the present invention shall fall within the claims of the present invention.

As described above, according to the present invention, the vertical jig and the wire electrode are made vertical by using the contact sensing function and the electric discharge machining function of the wire electric discharge machine. You can do it.

Claims (1)

A first step (S1) of detecting and confirming contact between the vertical fixture and the wire electrode by moving the motor driving means 16 to approach the vertical fixture and the wire electrode toward the axis determined to set the vertical setting; A second step (S2) of operating the motor driving means (16) after the vertical jig and the wire electrode are in contact to retract the vertical jig and the wire electrode on the X / Y axis by a predetermined distance in a non-contact state; A third step S3 of generating a discharge pulse through the discharge voltage supply means 14; A fourth step (S4) of operating the motor driving means (16) to move the vertical fixture and the wire electrode to the X / Y axis to approach again; A fifth step S5 when the discharge voltage detection means 18 determines that the discharge has occurred, and proceeds to the next step and branches to the third step S3 when it is determined that the discharge has not occurred; A sixth step (S6) of generating a discharge pulse the reference number of times through the discharge voltage supply means (14) when it is determined that a discharge has occurred; When it is determined that the number of discharges detected by the discharge voltage detecting means 18 and applied to the numerical control means 10 has reached the number of discharges when the wire electrode is in the vertical position, the numerical control means 10 has reached. A seventh step S7 of terminating the vertical position adjustment; As a result of the determination by the numerical control means 10, when the number of discharges when the wire electrode is in the vertical position has not been reached, an eighth step (S8) of storing the previous discharge count count value in the numerical control means 10; ; A ninth step (S9) of operating the motor driving means (16) to move the vertical fixture and the wire electrode by a predetermined amount on the U / V axis; A tenth step S10 of generating a discharge pulse a reference number of times again through the discharge voltage supply means 14; An eleventh step (S11) in which the current number of discharges is counted by the numerical control means (10); A twelfth step (S12) of branching to the seventh step (S7) if it is determined by the numerical control means (10) that the current discharge count count value is greater than the previous discharge count count value; And As a result of the determination by the numerical control means 10, if it is determined that the current discharge count count value is smaller than the previous discharge count count value, the moving direction of the U / V axis is changed in the opposite direction, and then the process proceeds to the eighth step S8. Wire vertical setting method of the wire discharge processing machine composed of the thirteenth step (S13).