JPS58196924A - Non-conductive material electrolytic discharge machining method - Google Patents

Abstract

PURPOSE:To enable griding and cutting with high accuracy in a short time by forming discharge bands and polishing bands on the peripheral surface of a disc in such a manner that an electric griding and a mechanical griding are laternately repeated to a non-conductive material to be ground. CONSTITUTION:In an electrolytic discharge machining method using a grinder having a conductive portion, electrodes of a voltage supply device E are connected to a disc 1 and a non-conductive material M to be ground. The disc 1 is rotated at high speed and electrolyte is supplied, so that a DC current of a fixed voltage is applied between the disc 1 and the material M. A solution of 1 to 2% of electrolyte NaNO3, NaCl, KNO3 or the like is used. Discharge bands 11 and polishing bands 12 are alternately brought into contact with the non- conductive material M with a short-time time lag by high-speed rotation of the disc 1 to generate pulses, so that electrolytic discharge is advanced by dielectric action. Thus, griding and cutting can be performed with high accuracy in a short time.

Description

[Detailed description of the invention] It is related to a release electric machining method.

Recently, electric discharge machining using electrical energy has been used as a method for grinding and cutting IilPA materials such as cemented carbide.

However, since electric discharge machining is a machining method that assumes electrical conductivity, it is not suitable for machining non-conductive cutting materials such as ceramics, glass, quartz, crystal, and sapphire.

The invention was made to improve the above-mentioned points, and it is a method of electrolytic discharge machining that can grind and cut non-conductive hard materials at a high I# degree and in a short time. t''.

Next, an example will be described.

Inside the grinding disk! 1 (1) (hereinafter referred to as a 1,000-disk disk) is a disk that alternately forms discharge bands (11) consisting of four electrically conductive portions and kenkotei (12) consisting of non-conductive portions at the circumferential edge.

An example of circle 11 (1) used in the present invention will be described below.

That is, the disk (1) is a commercially available product made by baking and hardening particles of green curl random, white curl random, pink curl diamond, etc. using an excessive 9-inter.

As long as the particles forming #4 of the disk (1) have excellent insulation and wear resistance, materials other than -hysterite may be used.
It is J-Noh.

A shaft hole (2) is formed in the center of the disc (1), and a current-carrying cylinder (3) is provided on the inner peripheral surface of the shaft hole, and the current-carrying cylinder (3) contacts at the center of the side surface of the disc (1). , donut-shaped current collector plate (
4) Form.

The current carrying tube (3) and the current collecting plate (4) are made of a known metal or the like with excellent conductivity.

The end curved surface of this disk (1) is carved with an end flange in the transverse direction, and the side surface is provided with side grooves that communicate with the current collecting plate (4) at equal or unequal intervals. be engraved on.

The insides of both grooves are filled with a material such as an alloy of copper and nickel that has low electrical properties, and connect the discharge band (11) and the discharge band (11) and the current collector plate (4). Retrospective 1jL road (13)
form. The portion of the circumferential surface of the main body (1) that does not form the conductive band (11) will form the conductive band (1z) as it is.

As a result, each discharge band (11) r formed at the peripheral edge is electrically connected to the current collector plate (3) via the current conducting path (13).

<2> Applied current The grinding method of the present invention uses an Ik current.

That is, electrodes are connected to the disk (1) and the object to be ground (M), respectively, so that a constant separation pressure (1) (1) and DC current ft can be applied between the two (1) (M>).

By the way, if the object to be ground (M) is made of a non-conductive material, no electricity is applied, so no discharge 'vL should occur.

However, when the disk (1) with the above structure is rotated at high speed with electrodes connected, the discharge part (discharge band) and the non-discharge part (polished zone) alternately contact the ψr-controlled m (M) with a short time difference. It turns out.

As a result, a discontinuous Zers wave is applied to the workpiece to be ground (M), and the non-conductive workpiece to be ground (MJ
W-force action occurs.

Therefore, even if the object to be ground (M) is made of a non-conductive material and there are b, the discharge can be performed with i3J capability.

Next, the processing method will be explained.

(1,> Connect the electrode from the DC current applied voltage supply device (E) to the disc (1) and the non-conductive workpiece (M) to be ground.

Next, rotate the disk (1) at high speed to supply electrolytic pfL [7
, a constant voltage DC current is applied between both (1) and (M).

As electrolytes, NaNO3, Na1l, KNO
3JI) can be used.

<2> Electrical grinding As mentioned above, the non-conductive object to be ground (N1) has a disk (1
) By rotating at high speed, the electric discharge @ (11) and the polishing band (12) alternately generate hair ml with a short time difference, generating pulses, and electrolytic discharge progresses due to electrolytic action.

The object to be ground (M) is bath melted by electrolytic discharge action.

By changing the nose spacing, the object to be polished (M
) can determine the maximum value of applied current and voltage that is optimal for electrolysis.

In other words, the determination of the pulse is influenced by changes in the rotational speed of the 0 disc (1), ■ the width of the discharge band (11) of the disc (1), and ■ the distance between the discharge band and the next Maki Kantei. Become.

As an example, we were able to give the following numerical values.

Flow voltage 5~100■ 01~IOA Nozers liquid 50~50110) IZ <3> After the mechanical grinding discharge belt (11) has progressed to melt the workpiece (M) according to the force shown in Table 1, Next, the non-conductive KenjII Emperor (12) passes through the commonly understood part of 11.

At this time, no discharge is performed, and the abrasive band (12) mechanically peels off and removes the slightly exposed portion of the Table 1 button.

As shown in E, the discharge band (1) formed on the circumferential surface of the disk (1)
1) and the abrasive band (12) alternate electrical grinding and mechanical grinding 1'llj to the edge of the non-conductive workpiece by 1V [7 and f].
Because of this, extremely efficient -f cutting becomes a practical function. .

<42 In other examples and above, a discharge band is partially formed on a non-conductive grindstone L='
Although the case where an FC grinding wheel is used has been explained, it is of course possible to use a grinding wheel in which a conductive grinding wheel is partially formed with a non-conductive grinding zone. It can be used if it is.

Also, the above explanation was about the grinding disk.

If the disk (1) is formed to have a thickness of 1 or less, it can be used for cutting non-conductive materials due to the same effect.

Since the present invention is as explained above, the following effects can be expected.

<B> For a non-conductive material that was considered to be non-conductive with conventional electrolytic grinding technology, a circle IiE consisting of alternating conductive parts and non-conductive parts on the circumference is rotated at high speed. By applying a Kri current between this disk and the material, a nozerus is generated and the discharge becomes aJ function due to the S electric current VC.

Therefore, it becomes possible to electrically grind or cut a non-conductive material during discharge.

〈口〉 Also, since the electrical grinding and the mechanical grinding using the non-conductive portion of the disc are performed at high speed, the effect of internal grinding occurs synergistically, improving the grinding and cutting efficiency.

＜）・〉 Even if the finish dimensions and surface precision are not as sharp as 1, there is no need to separately perform mechanical grinding in the next process as in the case of an electrolytic grindstone.

It is possible to obtain a purer force and more rkJ than mechanical grinding.

19 The electrolytic grinding #+4 of Takumai used in the present invention does not need to be made porous like Haku, and can be used in the same way as the grinding stone used by Kakumai. Since you can use C,
With GIU, a cuff is formed and released, making it easier to form a thin wall.

41 volume rate continuation Figure CJ4 - A schematic diagram of the processing method of the example.

1: Disk, 11; Discharge Tei, 12. Ken*Tei, Patent Applicant Southern Limited Company Lta Magnetic Research t'tr Agent, Masu Filled Earth, Yamame period, Raw Procedures Amendment Honorary Statement, July 12, 1980, Mr. Kazuo Wakasugi, Director General of the Special IR Agency, 1, Indication Special of the Case Application No. 57-75986 (2) Name of the invention Electrolytic discharge machining method for non-conductive materials (3) Relationship to the case of a person who performs a divine restraint Applicant Address 602 Komaoka-cho, Mi-ku, Yokohama City, Kanagawa Prefecture Name: Applied Magnetic Research Co., Ltd. Representative: Akio Kuromatsu 41 (Address: Takemoto Building 6, No. 17, Shinbashi 2-12, Minato-ku, Tokyo)
02 Phone 501-9385 Name (8241) f
P Ridoyama [”Saku 5 car stop date from]
From.

b. Object of correction The statement of the scope of claims is amended as follows.

``Circle #1 is used which has alternating conductive discharge bands and non-conductive polishing bands on the end face of the grinding wheel.

The conductive discharge band of the grinding wheel.

between the non-conductive material, Apply DC voltage.

What is done by giving an H rotation to the disk is a 1r% image.

"Electrolytic discharge machining method for non-conductive materials"<2> The statement in the 8th line of 7jj is supplemented as follows.

“becomes Roe Noh.

Next, if we consider whether an electrifying effect occurs in a non-conductive substance, we can think of saturation as shown below. However, the precise IA theory is still a long way from being clarified, and the following is an inference based on the fact that it is actually possible to process non-conductive materials. 3. The workpiece is a non-conductive material. However, it is not a 1001 perfect crystal, but contains a mixture of impurities.

Among these small amounts of impurities, it is thought that there is an i'I ability that conducts electricity through the conductive substance and causes a conductive effect on the surface of the workpiece.

〉 The electrolyte penetrates into the micro-pores on the surface of the workpiece and conductive action occurs on the surface. g] Possibly oily.

Kuha〉 It is also possible that the discharge zone of the grinding wheel is discontinuous and as a result discharge occurs with the workpiece.

In reality, sparks are generated 12 between the workpiece and the magnet by applying a resonance frequency to the workpiece due to e-Rus.

＼Nin When the magnet comes into contact with the surface of the workpiece at high speed, the surface roughness increases somewhat.

It is also conceivable that due to the m degree increase, some of the electrons in the object become movable, and C changes into a four-electric substance, causing a conductive effect.

...17 It is thought that when the loquat part of the magnet intermittently comes into contact with the workpiece, which is a brocade electric body, electricity is stored and discharged.

Claims (1)

[Scope of Claims] A disc having alternating non-conductive discharge bands and conductive grooves on the end face of the grinding wheel is used, and between the conductive discharge band of the grinding wheel and a non-conductive material. A method for electrolytic grinding of non-conductive materials, which is characterized by applying l1lfIL voltage and rotating the disc.