JPH0542366A - Micro welding equipment - Google Patents

Abstract

PURPOSE:To perform coating hardening treatment with high accuracy by providing a device to give a vibration to a coating material electrode by a magnetostrictive material or an electrostrictive material on micro welding equipment. CONSTITUTION:Since the device 4 to give the vibration to the coating material electrode 3 by the magnetostrictive material 41 or the electrostrictive material is provided on the micro welding equipment which generates pulse discharge between the coating material electrode 3 and a treating body 1 to be coated while vibrating and bringing the coating material, electrode 3 close to and away from the surface of the treating body 1 to be coated, repeatedly transfers and deposits a fine molten part of the coating material electrode 3 on the surface of the treating body and forms a coating layer on the surface of the treating body, changeover and control of the amplitude and frequency of the vibration of the coating material electrode 3 are carried out carefully and the coating hardening treatment with high accuracy is made possible by regulating the strength and frequency of a magnetic field or an electric field.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microwelding apparatus for welding and coating a desired material on the surface of a treatment object such as a tool by electric discharge coating.

[0002]

2. Description of the Related Art Conventionally, a microwelding technique has been known in which a blade surface of a tool such as a drill is hardened by electric discharge coating. That is, specifically, WC
A carbide electrode is used as the coating material electrode, and a pulse discharge is generated between the coating material electrode and the tool while vibrating the blade surface of the tool to be coated to make contact and separation, and minute melting of the discharge point of the coating material electrode This is a method in which a portion is repeatedly transferred and welded to the tool surface to form a coating layer on the tool surface, and a uniform coating layer is formed on the entire blade surface while continuously moving the contact point between the electrode and the tool blade surface. By thus forming the coating layer of cemented carbide on the blade surface, the blade surface can be hardened. In such microwelding, a solenoid or other mechanical means has been conventionally used as a means for applying vibration to the coating material electrode, but switching or adjustment of the amplitude or frequency is not easy and the coating material electrode It is difficult to adjust the gap width between the processing body and the processing body, and it is difficult to perform highly accurate coating processing.

[0003]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to switch and control the amplitude and frequency of vibration applied to a coating material electrode. An object of the present invention is to provide a microwelding device that is easy and can perform highly accurate coating processing.

[0004]

The above object can be achieved by providing a device for applying a vibration to a coating material electrode by a magnetostrictive material or an electrostrictive material. Further, it is recommended that the magnetostrictive material or the electrostrictive material adjust the vibration of the coating material electrode and the gap width between the coating material electrode and the processing body.

[0005]

As described above, when the covering electrode is configured to be vibrated by the magnetostrictive material or the electrostrictive material, the covering material is adjusted by adjusting the strength and frequency of the magnetic field or electric field for vibrating the magnetostrictive material or the electrostrictive material. Since it is possible to finely switch and control the amplitude and frequency of the electrode vibration, it is possible to perform highly accurate coating processing.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the drawings. FIG. 1 is an explanatory view showing a main part of an embodiment of a microwelding device according to the present invention. In the figure, 1 is a drill (processing body) which should be subjected to surface coating hardening treatment on the blade surface,
It is mounted on a working table 2 which is movable in the X-Y axis directions and which can rotate the drill 1 about its axis.
Reference numeral 3 denotes an electrode of a super hard coating material such as WC-Co, which is attached to the electrode vibrating device 4 by a chuck 40. The electrode vibrating device 4 has a magnetostrictive material 41, an electromagnetic coil 42, a yoke 43, and the chuck 40, and is attached to the lower end of the shank 5 which can be raised and lowered. 6 is a power supply circuit for passing a high-frequency exciting current through the electromagnetic coil 42, 7 is a power supply device for supplying a pulsed discharge current between the processing body 1 and the coating material electrode 3, and 8 is a drive for the machining table 2 and a power supply circuit 6 and It is a control device that controls the operation of the power supply device 7 and the like.

In carrying out the surface coating hardening treatment on the blade surface of the drill 1 using the above apparatus, the working table 2 and the shank 5 are driven to place the tip of the coating material electrode 3 on the blade surface portion of the drill 1 to be processed. Face each other. Then, when a high-frequency exciting current is supplied from the power supply circuit 6 to the electromagnetic coil 42, the fluctuating magnetic field generated causes the magnetostrictive material 41 to expand and contract, vibrate, and the tip of the covering material electrode 3 comes into contact with and separates from the blade surface of the drill 1. When a discharge current is supplied from the power supply device 7 between the covering material electrode 3 and the drill 1 in that state, pulse discharge is generated between the blade surface of the drill 1 and the tip of the covering material electrode 3 that contacts and separates from the blade surface, and A small portion of the discharge point at the tip of the material electrode melts and adheres to the blade surface of the drill 1. In this way, the microdissolved portion at the tip of the coating material electrode is repeatedly transferred and welded to the surface of the blade surface of the drill 1 to stack the coating layer, and the processing table 2 is driven to remove the coating material electrode 3 and the blade surface of the drill 1 from each other. By continuously moving the contact point, a uniform coating layer is formed on the entire blade surface. As a result, a coating layer of cemented carbide, which is the material of the coating material electrode, is formed on the blade surface of the drill 1, and the blade surface is hardened.

In forming the coating layer,
The processing conditions such as the vibration frequency and amplitude of the coating material electrode 3 and the gap width between the coating material electrode 3 and the blade surface of the drill 1 have a great influence on the quality and accuracy of the coating layer to be formed. This can be easily adjusted by changing the frequency and voltage of the exciting current leading to the coil and changing the vibration frequency and amplitude of the magnetostrictive material 41. That is, the vibration frequency of the covering material electrode 3 can be adjusted by the frequency of the exciting current flowing through the electromagnetic coil 42, and the amplitude of the covering material electrode 3 can be adjusted by the voltage amplitude of the exciting current flowing through the electromagnetic coil 42. Electromagnetic coil 42 for fine adjustment of the gap width between the drill and the blade surface of the drill 1.
It can be achieved by adjusting the bias voltage of the exciting current leading to the.

As the magnetostrictive material 41, for example, Tb _0.3
When using a Dy _0.7 Fe _1.9 alloy columnar shape with a diameter of 5 mm and a length of 10 cm and applying a magnetic field fluctuation up to 600 Oersted by passing an exciting current of 5 A (5000 mA) to the electromagnetic coil 42, 0.15 mm An elongation of (150 μm) could be obtained. That is, an elongation of 0.03 μm can be obtained per 1 mA, and the discharge gap between the tip of the covering electrode 3 and the surface of the treated body can be controlled with extremely high precision. Responsiveness up to a frequency of about 5 kHz was obtained.
Practically, the vibration frequency of the magnetostrictive material is 800Hz and the amplitude is 0.5 ~.
Under the conditions of 1 μm, Ip = 35 A of pulse discharge current and τ _on = 10 μs, the blade surface of a 10 mmφ drill could be surface hardened in 35 seconds.

The wear resistance of the coating layer depends on, for example, the coating material electrode 3
When an alloy of 10% W, 10% V, 15% B, 6% TiN, and the balance Fe is used for forming a coating layer with a thickness of 35 μm on the blade surface of the drill 1 and perforating the melamine resin. , The life was about twice as long as the untreated one. By forming the coating layer 1c to have a thickness of usually 10 μm or more and 100 μm or less, wear resistance of the blade surface can be improved, and precision molding can be performed without lowering the shape accuracy of the blade surface. An electrostrictive material may be used instead of the magnetostrictive material 41.

[0011]

As described above, according to the present invention, since the vibration is applied to the coating material electrode by the magnetostrictive material or the electrostrictive material, the strength and frequency of the magnetic field or electric field for vibrating the magnetostrictive material or the electrostrictive material can be controlled. Since the amplitude and frequency of the vibration of the coating material electrode can be finely adjusted and controlled by the adjustment, highly accurate coating curing treatment can be performed.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of a micro welding device according to the present invention.

[Explanation of symbols]

 1 Drill 2 Machining table 3 Coating material electrode 4 Vibration device 40 Chuck 41 Magnetostrictive material 42 Electromagnetic coil 43 Yoke 5 Shank 6 Excitation current power supply circuit 7 Discharge current power supply device 8 Controller

Claims (3)

[Claims] 1. A coating material electrode on the surface of a treated body (1) to be coated.
While vibrating (3) to bring the electrode into contact with and away from it, a pulse discharge is generated between the coating material electrode and the treatment body to repeatedly transfer and weld the microdissolved portion of the coating material electrode to the treatment body surface to form a coating layer on the treatment body surface. A microwelding device, characterized in that a device (4) for applying vibration to the covering material electrode (3) by a magnetostrictive material (41) or an electrostrictive material is provided. 2. The microwell according to claim 1, wherein the magnetostrictive material (41) or the electrostrictive material is configured to adjust the gap width between the coating material electrode and the processing body together with the vibration of the coating material electrode (3). Ding equipment. 3. The microwelding device according to claim 1, wherein the object to be coated (1) is a tool.