TW201912277A - Through hole machining control system of electrical discharge machine in which a decision-making module determines whether a workpiece to be processed has been penetrated through according to weighted information and spectrum information - Google Patents

Abstract

A through hole machining control system of an electrical discharge machine comprises a carrier, a moving unit, a processing unit, and a control unit. The carrier is configured to carry a workpiece to be processed. The moving unit includes a screw rod, a moving carriage that is driven by the screw rod to move, a motor that drives the screw rod to rotate, and a displacement sensor that outputs a position signal corresponding to a position of the moving carriage. The processing unit includes a machining water discharge main shaft disposed on the moving carriage and a processing electrode extending downward. The control unit is configured to drive the motor to run and to drive the processing electrode to discharge, and includes a position recording module for receiving the position signal and performing weighted calculation into weighted information, a voltage recording module for measuring an operating voltage of the processing electrode, a spectrum analysis module for calculating spectrum information according to the operating voltage, and a decision-making module for determining whether the workpiece to be processed has been penetrated through.

Description

Electric discharge machine through hole machining control system

The present invention relates to an electric discharge machine, and more particularly to an electric discharge machine through hole machining control system.

Referring to FIG. 1, a prior art electric discharge machine is used for performing electric discharge machining on a workpiece 11 to be processed. The electric discharge machine includes a carrier 12 for mounting the workpiece 11 and a carrier 12 disposed thereon. a through-hole detecting substrate 13 under the workpiece 11 to be processed, a processing electrode 14 for electrically discharging the workpiece 11 from above the workpiece 11 to be processed, an electrical connection between the carrier 12 and the processing The power source 15 of the electrode 14 and a through hole detector 16 electrically connected to the power source 15, the through hole detecting substrate 13 and the processing electrode 14.

In use, the processing electrode 14 is powered by the power source 15, and the processing electrode 14 is subjected to electrical discharge processing of the workpiece 11 downward. When the workpiece 11 is penetrated, the processing electrode 14 is The through hole detecting substrate 13 is contacted and forms a circuit loop with the through hole detector 16, and the through hole detector 16 can thereby determine that the workpiece 11 has been penetrated, thereby driving the power source 15 to stop supplying power. .

However, when the processing electrode 14 is in contact with the through-hole detecting substrate 13 a plurality of times, the through-hole detecting substrate 13 is easily damaged. Therefore, the through-hole detecting substrate 13 must be replaced frequently, which is very inconvenient to use.

In addition, referring to FIG. 2, when the electric discharge machine is used to process a workpiece 17 having an aperture 171 therein, if it is only required to penetrate a top wall 172 located above the aperture 171, it is not required to be located therethrough. The bottom wall 173 below the aperture 171 cannot be disposed only for the through hole detection substrate 13 under the top wall 172. Therefore, the top wall 172 cannot be processed only, that is, the electric discharge machine can The form of the workpiece to be processed is limited, and thus it is not convenient to use.

Accordingly, it is an object of the present invention to provide an electric discharge machine through hole machining control system that overcomes at least one of the disadvantages of the prior art.

Therefore, the through-hole processing control system of the electric discharge machine of the present invention is used for performing electric discharge machining on a workpiece to be processed, and the through-hole machining control system of the electric discharge machine includes a base, a carrier, a moving unit, and a processing unit. And a control unit.

The carrier is disposed on the base and is configured to carry the workpiece to be processed. The moving unit includes a frame disposed on the base, extending along a top and bottom direction, and being rotatably disposed around the shaft a screw of the body, a moving platform screwed to the screw and movable in the direction of the top and bottom by the screw, a motor disposed on the frame and linked to the rotation of the screw, and a motor disposed on the motor according to a displacement sensor for outputting a position signal of a position of the mobile station, the machining unit includes a machining water main shaft disposed on the mobile station, and a bottom connected to the bottom of the machining water shaft a carrier electrode disposed downwardly and extending downward for processing the workpiece to be processed, the control unit for driving the motor and driving the processing electrode to discharge, the control unit including an electrical connection to the displacement sensor a position recording module for receiving the position signal and performing weighting calculation into a weighted information, and a voltage recording electrically connecting the processing electrode to measure an operating voltage of the processing electrode a spectrum analysis module that receives and calculates a spectrum information based on the operating voltage, and a decision module electrically connected to the motor and the processing electrode, the decision module determines the to-be-processed according to the weighted information and the spectrum information Whether the piece is discharged through, and after the workpiece is penetrated, and the moving table continues to move downward by a predetermined distance, the driving of the motor is stopped and the supply of the machining electrode is stopped.

The effect of the present invention is that the decision module is configured according to the weighted information and the spectrum by the displacement sensor, the processing electrode, the position recording module, the voltage recording module and the spectrum analysis module. After the information is judged to be discharged through the workpiece, and after the mobile station continues to move downward by the predetermined distance, the driving of the motor is stopped and the power supply to the processing electrode is stopped.

Referring to Figures 3 and 4, an embodiment of the through hole machining control system of the electric discharge machine of the present invention is used for performing electric discharge machining on a workpiece 9 to be processed. The electric discharge machine through hole processing control system comprises a base 2 and a bearing. The base 3, a mobile unit 4, a processing unit 5, a control unit 6, and an electrode guide 7.

The carrier 3 is disposed on the base 2 and is used to carry the workpiece 9 to be processed.

The moving unit 4 includes a frame 41 disposed on the base 2, a screw 42 extending along a top-bottom direction Z and rotatably disposed about the shaft 41, and being screwed to the screw 42. a moving table 43 that moves in the top-bottom direction Z by the interlocking of the screw 42 , a motor 44 disposed on the frame body 41 and linked to the rotation of the screw 42 , and a motor 44 disposed on the motor 44 and according to the motor 44 The amount of rotation outputs a pair of displacement sensors 45 that are position signals of the position of the moving table 43. In the embodiment, the displacement sensor 45 is an encoder, and the position signal corresponding to the position of the mobile station 43 can be calculated according to the rotation amount of the motor 44. The position signal can be a voltage type or It is a current type or a data packet.

The processing unit 5 includes a machined water main shaft 51 disposed on the moving table 43 and a bottom portion of the machined water main shaft 51 and corresponding to the carrier 3 and extending downward for discharging the workpiece 9 to be processed. Processed electrode 52. In the embodiment, the machined water main shaft 51 is used to supply a machining liquid 511 to the workpiece 9 to be processed.

Referring to Figures 3, 5, and 6, the control unit 6 is configured to drive the motor 44 to operate and drive the processing electrode 52 to discharge. The control unit 6 includes an electrical connection to the displacement sensor 45 to receive the position signal and perform weighting calculation. a position recording module 61 for weighting information, a voltage recording module 62 electrically connected to the processing electrode 52 for measuring an operating voltage V of the processing electrode 52, and receiving and calculating a spectrum information F according to the operating voltage V The spectrum analysis module 63 and a decision module 64 electrically connecting the motor 44 and the processing electrode 52.

The position recording module 61 performs weighting calculation on the position of the mobile station 43 corresponding to the position signal with a low weighting parameter before a preset position, and the position of the mobile station 43 corresponding to the position signal is After the preset position is weighted by a high weighting parameter higher than the low weighting parameter, the weighting information is obtained, so that the position of the mobile station 43 is at the preset position, and the corresponding weight information is Large changes are available for subsequent interpretation.

The spectrum analysis module 63 performs the fast Fourier transform on the received operating voltage in a predetermined period of time, removes the low frequency part information F1, and creates the remaining high frequency part information F2 as the spectrum information F.

The determining module 64 determines whether the workpiece 9 is discharged through the weighting information and the spectrum information F. When determining, the determining module 64 calculates and determines the movement according to whether the weighting information passes the high weighting index. Whether the stage 43 has passed the preset position, and after the mobile station 43 has passed the preset position and the spectrum information F conforms to a preset spectrum state, it is determined that the workpiece 9 has been discharged through, and After the workpiece 9 is penetrated and the moving table 43 continues to move downward by a predetermined distance, the driving of the motor 44 is stopped and the supply of the machining electrode 52 is stopped.

It should be noted that, in addition to the pattern of the pattern, the preset spectrum pattern may also be a plurality of specific frequencies. When the spectrum information has the specific frequency, it may be determined that the workpiece 9 has been processed. It is discharged through.

The electrode guide 7 is disposed on the frame 41 and passes through the processing electrode 52 to guide the position of the processing electrode 52.

Referring to Figures 3 and 4, the steps of using the electrical discharge machine through hole machining control system are further described. After the workpiece 9 is placed on the carrier 3, the decision module 64 drives the motor 44 to operate. The moving table 43 moves downward, and simultaneously drives the processing electrode 52 to discharge the workpiece 9 to be processed, and the machining water main shaft 51 releases the machining liquid 511 at a portion to be processed by the processing electrode 52. The mobile station 43 has not moved to the preset position, so the decision module 64 determines that the weighting information has not been subjected to the weighting calculation of the high weighting parameter, and therefore determines that the workpiece 9 has not been penetrated, thus continuously driving the mobile station 43. The machining electrode 52 is driven to move downward.

During the processing, the machining fluid 511 is continuously injected into the position where the workpiece 9 is subjected to electrical discharge machining. Since the machining fluid 511 is incompressible, the machining electrode 52 is affected by the water pressure of the machining fluid 511. Will be offset.

Referring to FIGS. 3, 6, and 7, when the moving table 43 moves beyond the preset position, and the processing electrode 52 starts to penetrate through the workpiece 9, the machining liquid 511 will leak downward, and the processing electrode 52 is at this time. The moment is no longer affected by the water pressure, so jitter is generated, and then the decision module 64 determines that the weighting information has been subjected to the weighting calculation of the high weighting parameter, and then the spectrum information F is determined, because the processing electrode 52 The influence of the jitter, so that the high frequency signal is displayed in the spectrum information F, and then it is determined that the spectrum information F conforms to the preset spectrum state, and it can be determined that the workpiece 9 has been discharged through.

Since the portion to be processed 9 is initially discharged, and some of the edges are not completely removed by the discharge, the decision module 64 continues to drive the moving table 43 to move the processing electrode 52 downward by the predetermined distance to complete the The electric discharge machining operation of the workpiece 9 to be processed.

With the above technology, the applicant can complete the detection within 2 seconds after the workpiece 9 is penetrated, and the accuracy of repeated use can be maintained at 0.5 mm when the electric discharge machine through hole processing control system is actually applied. It has very good performance.

In addition, since it is not necessary to provide the through hole detecting substrate as in the prior art electric discharge machine, the cost of replacing the through hole detecting substrate can be reduced, and the electric discharge machine through hole processing control system can also be applied to any A single-layered hole to be processed is required, and is not limited by the necessity of providing the through-hole detecting substrate, so it is very convenient to use.

In summary, the decision module 64 can be configured according to the settings of the displacement sensor 45, the processing electrode 52, the position recording module 61, the voltage recording module 62, and the spectrum analysis module 63. After the weighted information and the spectrum information F are determined to be discharged through the workpiece 9 and then the moving table 43 continues to move downward by the predetermined distance, the motor 44 is stopped and the power supply to the processing electrode 52 is stopped. The object of the invention can be achieved.

However, the above is only the embodiment of the present invention, and the scope of the invention is not limited thereto, and all the equivalent equivalent changes and modifications according to the scope of the patent application and the patent specification of the present invention are still The scope of the invention is covered.

2‧‧‧Base

3‧‧‧ bearing seat

4‧‧‧Mobile unit

41‧‧‧ ‧ frame

42‧‧‧ screw

43‧‧‧Mobile station

44‧‧‧Motor

45‧‧‧ Displacement Sensor

5‧‧‧Processing unit

51‧‧‧Processing water spindle

511‧‧‧Processing fluid

52‧‧‧Processing electrodes

6‧‧‧Control unit

61‧‧‧Location Recording Module

62‧‧‧Voltage recording module

63‧‧‧Spectrum Analysis Module

64‧‧‧Decision module

7‧‧‧Electrode guide

9‧‧‧To be processed

F‧‧‧ Spectrum Information

F1‧‧‧Low frequency information

F2‧‧‧ High-frequency information

V‧‧‧ working voltage

Z‧‧‧ top and bottom direction

Other features and effects of the present invention will be apparent from the following description of the drawings, wherein: Figure 1 is a schematic view of a prior art electrical discharge machine, illustrating that the electrical discharge machine performs electrical discharge machining on a workpiece to be processed; 2 is a schematic view of the prior art electric discharge machine, illustrating that the electric discharge machine performs electric discharge machining on another workpiece to be processed; FIG. 3 is a schematic view showing an embodiment of the through hole machining control system of the electric discharge machine of the present invention; Is a schematic diagram of the use of the embodiment, illustrating a state in which the workpiece is not penetrated; FIG. 5 is a working voltage diagram of the embodiment; FIG. 6 is a spectrum information diagram of the embodiment; and FIG. 7 is a similar In the view of Fig. 4, the state in which the workpiece to be processed has just been penetrated will be described.

Claims (5)

An electric discharge machining machine through hole processing control system for performing electric discharge machining on a workpiece to be processed, the electric discharge machine through hole processing control system comprising: a base; a carrier disposed on the base and configured to carry the a moving unit, comprising: a frame disposed on the base, a screw extending in a top and bottom direction and rotatably disposed around the shaft of the frame, and being screwed to the screw a moving table that moves in the direction of the top and bottom by the interlocking of the screw, a motor that is disposed on the frame and rotates the screw, and a motor that is disposed on the motor and outputs a pair of mobile stations according to the amount of rotation of the motor a displacement sensor of the position signal of the position; a machining unit comprising a machining water main shaft disposed on the movement table, and a bottom connected to the machining water shaft and corresponding to the carrier seat and extending downward for use a processing electrode for performing electrical discharge machining on the workpiece; and a control unit for driving the motor to operate and driving the processing electrode to discharge, the control unit including an electrical connection a position recording module that receives the position signal and performs weighting calculation into a weighted information, a voltage recording module electrically connected to the processing electrode to measure an operating voltage of the processing electrode, and receives and according to the working voltage a spectrum analysis module for calculating a spectrum information, and a decision module electrically connected to the motor and the processing electrode, the decision module determining, according to the weighting information and the spectrum information, whether the workpiece to be processed is discharged, and After the workpiece to be processed is penetrated and the moving table continues to move downward by a predetermined distance, the driving of the motor is stopped and the supply of the machining electrode is stopped. The electric discharge machine through hole processing control system according to claim 1, wherein the spectrum analysis module passes the fast Fourier transform after the working voltage received in a predetermined period of time, and removes the low frequency part information to become the Spectrum information. The electric discharge machine through hole processing control system according to claim 2, wherein the position recording module performs weighting calculation by using a low weighting parameter before the position of the mobile station corresponding to the position signal is before a preset position. And the position of the mobile station corresponding to the position signal is weighted by the high weighting parameter higher than the low weighting parameter after the preset position, thereby obtaining the weighting information. The electric discharge machine through hole processing control system according to claim 3, wherein the decision module determines whether the mobile station has passed the preset position according to whether the weighting information is calculated by the high weighting index, and the movement is After the preset position is passed and the spectrum information conforms to a preset spectrum state, it is determined that the workpiece to be processed has been discharged. The electric discharge machine through hole machining control system according to claim 1, further comprising an electrode guide disposed on the frame and for the machining electrode to pass through to guide the machining electrode.