JPS6335785A - Discharge coating device - Google Patents

Abstract

PURPOSE:To allow all parts of a material to be worked to be uniformly coated with a electrode material by providing a support shank brought into contact with the material to be worked to the tip of a vibrating head supporting the electrode and engaging a feeder between the support shank and the vibrating head, regulating and controlling the interval between the electrode and the material to be worked. CONSTITUTION:In case of oppositely approaching a vibrating head 8 to a material 2 to be worked, the tip of a support shank 9 is abutted on the surface of the material to be treated and a sensor 22 senses it and a signal is generated and thereby a switch 21 is turned on. At this time, when the interval between an electrode 1 and the material 2 to be worked is wide, the detected voltage of a resistance 16 is high and a motor 10 is actuated in comparison with reference voltage and an engaging device 11 is actuated to give feed and the electrode 1 is approached to the material 2 to be worked. The electrode 1 is vibrated by the actuation of an electromagnet 3 and stopped in case the average voltage of the interval between the electrode 1 and the material 2 to be worked is made equal to the reference voltage of a resistance 17. In this state, the electrode 1 performs stable and sure contacting and separating vibration for the surface of the material 2 to be worked, and pulse is given by on-off control of the switch 13 by means of the control of a pulser 14 and pulse discharge is repeated.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention involves gripping a vibrating head that supports a workpiece in the air, vibrating an electric head at the tip of the workpiece while contacting the workpiece, and applying a pulse discharge to the gap between the two. The present invention relates to an electrical discharge coating processing apparatus for welding and coating the electrode material onto a workpiece.

[Prior art]

Conventional electrical discharge coating processing equipment grips and supports the first head of the machine, and moves the coating material electrode fixedly supported at the tip of the electric (41?Fi) vibrating device δ built into the vibrating head close to the workpiece. Perform contact-release vibration.

The vibrating electromagnet is connected to be excited and controlled by the voltage of a pulse discharge capacitor that is in parallel contact with the gap between the electrode and the workpiece. When the gap is heard and the capacitor is charged, the electromagnet is excited by the charging voltage and vibrates. When the electrode is brought into contact with the workpiece and discharged, the voltage of the capacitor decreases, so the spring force repulsed by the lava stone causes the electrode to separate from the workpiece, and by repeating this process, the voltage at the discharge point decreases. 14
IP! It was constructed so that a coating layer could be formed over the entire surface by transferring and welding the material to the body and moving the discharge point.

〔problem〕

In the above-mentioned conventional electric discharge coating processing equipment, the tip of the lightning rod is manually opposed to the workpiece, so the contact pressure, vibration amplitude, vibration frequency, etc. of the electrode due to contact vibration are always kept at predetermined values. Moreover, the vibration frequency etc. change depending on the state of manual contact, which reduces the machining speed and has the disadvantage that it is not possible to uniformly coat the entire surface.

(Means for solving the problems) The present invention was proposed to improve the above-mentioned drawbacks, and
Support the electrode and excite Hil by, for example, PWM modulated output.
+ A feeding device that includes a vibrating head equipped with a controlled electromagnetic vibration device and a support handle whose tip is brought into contact with the workpiece, and adjusts and controls the gap between the electrode and the workpiece between the support handle and the vibration head. The invention is characterized in that a control circuit is provided for supplying a control signal to the feeding device to adjust the gap and feed the feeding device when the supporting pattern is brought into contact with the body.

[Example] The present invention will be explained below with reference to an embodiment of the drawings. In Fig. 1, a pulse discharge is performed in the opposing gap between one tip-shaped coating electrode and a 2-t workpiece. , applied to the electrode 1] While performing the contact-separation vibration EaJ with the body 2, the melt at the discharge point of the electrode 1 is transferred and welded to the workpiece 2.
, iI layer formation processing is performed. 3 is the electromagnet of the vibration device,
When the coil 4 is excited 1, the magnetic plate 5 is attracted and vibrates upward, and when the coil excitation is turned off, the repulsive force of the spring plate 6 causes it to vibrate downward, and this is controlled by excitation by applying a pulse signal to the coil 4. Generates sustained vertical vibration,
The electrode 1 fixedly supported on the chuck 7 at the tip of the spring plate 6 is vibrated. Reference numeral 8 is a head for installing the electromagnetic vibrating device 3, and the head is usually gripped for coating work. Reference numeral 9 is a support handle whose tip is brought into contact with the workpiece 2, and a motor 10 fixed to the head 8 is attached. It is engaged by an engagement device 11 such as a gear. 12 is a voltage source, 13 is an upper semiconductor switch, which is switched on and off by a pulser 14 to generate processing pulses. 15 is an output terminal, and a lead wire connects the electrode.
1. Connect to the workpiece 2. 16 is a resistor that spans between the terminals 15 and detects the electric current/I in the gap, 17 is a resistor that sets the 25 quasi-voltage, and the difference voltage between both resistors 16 and 17 is connected to the terminal 11.
and controls the motor 10 to drive the motor 10 in a hot manner. A PWM modulation circuit 19 performs PWM modulation on the gap voltage detected by the resistor 16 as a modulation signal, and supplies the modulated output to the vibration coil 4 from a terminal 20 to control vibration. Reference numeral 21 denotes a switch inserted into the signal circuit of the voltage signal detection resistor 16, which is turned on and off by a pressure-sensitive signal from a pressure-sensitive element 22 provided at the tip of the support handle 9.

As described above, the gripped head 8 is brought close to the workpiece 2 to face it during the coating operation. Then, the tip of the support handle 9 comes into contact with the surface of the workpiece, and the pressure sensitive element 22 senses this, generates a signal, and turns on the switch 21.

When the gap between the sharpening electrode 1 and the workpiece 2 is widened, the detected voltage of the resistor 1G is high and the differential voltage compared with the reference voltage causes the motor 10 to operate, actuating the engagement device 11 to provide feed, and ? ! Make lf pole 1 close to addendum 2 [body 2]
Suru. The electrode 1 is vibrating due to the operation of the electromagnet 3, and the vibrating electrode 1 is sent closer to the workpiece 2 and stops when the average voltage in the gap becomes equal to the base 7% voltage set by the resistor 17. . With this properly adjusted gap, the electric current 1 (
It is a vibration #JL, a stable and reliable contact amount #m is applied to the surface of the workpiece 2, and a switch 1 under the control of the balsa 14 is placed there.
Pulses are applied using the on/off control in step 2, and pulse discharge is repeated.

Due to the contact/separation vibration of the electrode 1 and the accompanying pulsed discharge, minute discharge points of the electrode material are uniformly transferred and welded to the workpiece 2 little by little, so that coating layer formation processing can be performed.

Also, the turbulence of the electrode 1 is detected by the resistor 16 (V:!). The electromagnet 4 is excited by the PWM output using voltage as a modulation signal (adaptive control is performed to reproduce the disturbance. For example, when the detection voltage of the resistor 16 decreases, the on-pulse width increases, and the detection voltage When the on-pulse width increases, the on-pulse width becomes smaller, and when the voltage decreases according to the gap voltage, the electromagnet excitation pulse width is increased and the magnetic plate 5 is attracted to lengthen the rise time of the electrode 1.1211 When the voltage becomes high By reducing the excitation pulse width, the upper back time of the electrode 1 is controlled to increase the dead time, and the imaging state is optimally controlled, thereby reducing the roughness of the machined surface and machining. Coating processing can be performed with improved speed.

In addition, the PW lvl modulation signal can be made into a signal by detecting the current flowing in the gap, the temperature of the electrode or the workpiece, the pressure generated by the discharge, the discharge sound, etc.
1. Electrode vibration can always be controlled in the best condition. A vibration generator using modulated output can increase the vibration frequency by arranging an electromagnet and an electromagnet or an electromagnet and a permanent magnet facing each other and utilizing their attractive force and repulsive force. Both PWM outputs can be used for the excitation pulse. The vibration power source is not limited to PWM, but conventional types can also be used.

Further, contact detection between the patient and the workpiece can be performed using electrically energized contact detection, optical or magnetic contact detection, vibration detection, or the like. Further, for the gap adjustment feed, any automatic feed using the discharge state as a signal other than Rivo feed using the gap voltage as a signal can be used.

In FIG. 2, a cylindrical support handle 91 is provided, and a guide 23 is installed in the support handle 91 so as to guide the electric wire 8i1 supported on the tip 7.
It is made up of the following. By guiding the electrode +41 to the support handle, a stable and smooth surface is applied to the electrode 1.
In addition, gas and liquid can be injected from inside the cylindrical body of the support handle 91, and diffusion treatments such as oxidation prevention, nitriding, and carbonization can be performed simultaneously during the coating process, as desired. Any desired coating N can be easily processed and formed.

Note that the discharging pulse power source can be arbitrarily used, such as one using a charging/discharging capacitor or a power source combining a transistor switch and a capacitor.

〔Effect of the invention〕

As described above, the present invention provides a grasping type electric discharge coating processing apparatus in which the tip of the workpiece is attached to a vibrating head that supports an electrode and is equipped with an electromagnetic FJI device that is excited and controlled by an oscillation output. A support handle is provided in contact with the workpiece, and a feeding device for adjusting and feeding the gap between the electrode and the workpiece is engaged between the support handle and the vibrating head, and when the support handle is brought into contact with the workpiece, the Since the feeder is equipped with a control circuit that supplies signals to adjust the gap and feed, when the vibrating head is gripped and coated, the specified gap is always maintained between the electrode and the workpiece. The electrode vibrates with a properly adjusted gap, and pulse discharge is applied to the surface of the liquid-added T body by repeating stable and reliable contact vibration to coat the surface. Enables coating processing with good roughness and high processing speed. In addition, by using the vibration power source 1: a PWM modulation circuit, the vibration of the song is controlled by the PWM output in the properly controlled gap, and the PWM modulation is modulated by the signal detected from the coating gap, and this By controlling the vibration with the output horn and causing vibration between contacts, the vibration is not only controlled by the frequency but also by the on-pulse width and off-pulse width of one synchronous control pulse, which allows the machining surface to be reduced and the machining speed to be reduced. It is possible to perform a good coating process with the following properties.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a partial block diagram of an embodiment of a μ-pond. 1... Electrode 2... Workpiece 3... Electromagnet 4... Coil 5... ... UAi publication 1 anti 6...
...Spring plate 8...Head 9...Support handle 10...Motor 11... Engagement device 12...Power source 13...Switch 14...Balsa 16...Voltage detection resistor 17 ......jt quasi-voltage setting resistor 19...
...PWM modulation circuit patent application
Person Co., Ltd. J1 Upper Japax Fill Kyusho Representative Don
-L Kiyoshi

Claims (1)

[Claims] (1) A discharge coating processing device that grips a vibrating head that supports an electrode, vibrates the electrode at the tip to contact and release the workpiece, and generates a pulse discharge in the gap between the two to weld and coat the electrode material on the workpiece. The vibrating head supporting the electrode is provided with a support handle whose tip contacts the workpiece, and a feeding device for adjusting and controlling the gap between the electrode and the workpiece is connected between the support handle and the vibration head. An electric discharge coating processing apparatus characterized in that a control circuit is provided for supplying a control signal to the feeding device to perform gap adjustment feeding when the supporting handle is brought into contact with the workpiece.