JPH03281121A - Method and device for removing micro-burr - Google Patents

Abstract

PURPOSE:To constrain the change in the absolute dimension of a work, by forming a local battery by a work, conductor and an electrolytic solution and simultaneously performing deburring by a mechanical action in the electrolytic solution. CONSTITUTION:A local battery is formed by a work 1, conductor 7 and an electrolytic solution 13 by bringing into contact with or connecting the work 1 and conductor 7 and dipping the work 1 and conductor 7 in the electrolytic solution 13. Then, the deburring of the work 1 is performed by a mechanical action with a mechanical deburring means 3 in this electrolytic solution 13. Thus an electric chemical action is superposed on the mechanical action and the change in the absolute dimension of the work 1 is constrained.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method and device for removing minute burrs, and in particular, to removing minute burrs during machining of precision products such as magnetic disk drive parts and magnetic heads. The present invention relates to a microburr removal method and device suitable for removing burrs.

[Conventional technology]

Conventional deburring methods include grinding machining such as barrel polishing and brush polishing, as well as ultrasonic A number of methods have been proposed, including those using chemical effects such as deburring and electrolytic deburring.

However, in none of these studies is there any mention of small burrs of several micrometers or less. For example, when polishing with a nylon brush, it appears that most of the burrs generated at the front of the machine can be removed, but upon closer inspection, burrs of several micrometers to around 10 micrometers remain.

In addition, according to chemical deburring, the entire surface of the workpiece with burrs is uniformly deburred, and if the burr width (notch) is 10 μm after Mf, the overall size is approximately 10 μm.
No consideration was given to the fact that since the reduction is close to .mu.m, it cannot be applied to the processing of parts with severe dimensional accuracy of around several .mu.m.

As an example of a deburring method using mechanical action,
No. 3-144943 discloses that a polishing member having polishing abrasive grains attached to a nylon nonwoven fabric while supplying a polishing liquid,
A method of press-contacting and rotating a plate molded product having burrs is disclosed.

In addition, as an example of a deburring method using chemical action,
Japanese Unexamined Patent Publication No. 63-286587 discloses a method comprising two steps of etching in which burrs generated on a pressed product are dissolved using metal-dissolving chemicals, and a step of neutralizing the remaining chemicals and cleaning. There is.

However, no technology has been developed to simultaneously apply mechanical and chemical effects to a workpiece containing burrs.

[Problem to be solved by the invention]

The above-mentioned conventional technology does not take into account the removal of minute burrs or the change in J' method.
There were problems such as a certain degree of burr remaining and changes in the absolute dimensions of the workpiece.

An object of the present invention is to provide a method and device for removing minute burrs that can remove minute burrs generated by mechanical action on a workpiece and suppress changes in the absolute dimensions of the workpiece. It is something to do.

[Means to solve the problem]

] In order to achieve the above object, the first aspect of the invention relating to the microburr removal method of the present invention is a method for removing burrs generated under mechanical action, which In contrast, a conductor different from the workpiece is contacted or connected in an electrolyte solution, a local battery is formed between the two objects, the conductor, and the electrolyte solution, and a mechanical action is applied to the part where the burr occurs. At the same time, it is designed to have electrochemical action.

Further, in order to achieve the above object, a second aspect of the invention relating to the microburr removal method of the present invention is a method for removing burrs generated due to mechanical or physical action,
A conductor different from the workpiece is contacted or connected in an electrolyte solution to a workpiece where burrs exist, and a local battery is formed between the workpiece, the conductor, and the electrolyte solution, and the burr is , the electrolyte solution contains fine particles to form a machining fluid, and this machining fluid is supplied at high pressure to the burr generating area to apply a mechanical action.

On the other hand, in order to achieve the above object, the most basic configuration of the microdeburring device according to the present invention is a device that removes burrs generated under mechanical action, and is a device that removes burrs generated by mechanical action. It is equipped with means for applying a mechanical action and means for applying an electrochemical action to the burr-generating portion of the workpiece.

More specifically, the configuration of the first invention related to the microdeburring device of the present invention is a device for removing burrs generated under mechanical action, which movably holds a workpiece having burrs. means for applying a mechanical action to the burr-generating portion of the workpiece; means for contacting or connecting a conductor different from the workpiece to the workpiece; and means for applying an electric current between the workpiece and the conductor. The means for flowing the electrolyte solution and the means for supplying the electrolyte solution to the burr-generating part of the workpiece are biased.

Further, a second aspect of the invention relating to the micro-deburring device of the present invention is a device for removing burrs generated under mechanical action, which includes means for movably holding a workpiece having burrs. , a means for supplying a mixture of electrolyte solution containing fine particles to the burr-generating part of the workpiece at high pressure; and a means for contacting or connecting a conductor different from the workpiece to the workpiece. and means for passing a current between the workpiece and the conductor.

[Effect]

The function of the above technical means is as follows.

The electrolyte solution (processing fluid) that acts electrochemically on the workpiece rarely causes a chemical change (etching action) when the workpiece is simply immersed, but the workpiece is different. When a conductor is brought into contact with or electrically connected to a conductor in a processing fluid, an etching action occurs, and as the workpiece becomes more chemically active, the etching action is further accelerated.

In general, metal materials and the like include, for example, Teru Kubo.

As described in Introduction to Mechanochemistry, Kagaku Doujin, 1971, page 3, when the molecules are arranged in a disordered manner, they are more chemically active than when the molecules are arranged in an orderly manner.

For this reason, it is possible to simultaneously perform mechanical processing, which applies plastic deformation and elastic deformation to the material and disturbs the arrangement of molecules, and chemical processing, which utilizes the chemical activity of the material due to the disturbance of the molecular arrangement. , it is possible to selectively chemically process parts that have been subjected to mechanical action. Microscopic burrs are the remains of parts that have been deformed by mechanical action, but as mentioned above, the mechanical action results in a combination of elastic and plastic deformation, resulting in large molecular disturbances. Sometimes electrochemical action is applied at the same time to remove minute burrs at the desired location.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 7.

FIG. 1 is a schematic configuration diagram of a deburring device according to an embodiment of the present invention, FIG. 2 is a perspective view of a magnetic disk device component to be processed, and FIG. It is an enlarged view of part A showing a burr occurrence part.

The deburring device shown in FIG. 1 shows an embodiment of the first invention.

In FIG. 1, 1 is a workpiece, and 2 is a holding part that is a means for holding the workpiece 1. This holding part 2 has a mechanism that can rotate and reciprocate up and down as shown by solid line arrows. However, since these mechanisms are based on known technical means, their illustrations are omitted here. Note that the holding part 2 is made of an insulating material such as plastic.
The workpiece and the mechanism that rotates and reciprocates up and down are electrically connected.

3 is a rotary brush for machining which is a means for applying mechanical action to the burr-generating part of the workpiece; 4 is the shaft of the rotary brush; 5 is a hole for supplying machining fluid; and 6 is a machining fluid spouting hole. Since the rotating single-stone V-motion mechanism is based on known technical means, illustration thereof is omitted here.

7 is a conductor, 8 is a power supply device, and 9.9' is a wire connection to workpiece 1. The conductor 7 is connected via a power supply device 8.

Reference numeral 10 denotes a machining fluid supply nozzle relating to means for supplying machining fluid to the burr-generating portion of the workpiece.

11 is a liquid tank for circulating the machining liquid j3.

Reference numeral 12 denotes a JJI water tank provided at the bottom of the liquid tank 11, which is configured to discharge the machining liquids 1 and 3 and return them to a field soil liquid supply tank equipped with a filtration means (not shown) to circulate the machining liquid. I'm doing J.

1 The workpiece 1 is held by the holding part 2 and is rotated or moved up and down while biting into the rotating machining brush 3 by a predetermined amount to remove burrs.

[Embodiment 1] An example will be described in which the deburring apparatus shown in FIG. 1 is used to perform deburring work on parts for a magnetic disk drive shown in FIGS. 2 and 3.

The magnetic disk device component IA shown in Fig. 2 is made of aluminum alloy, and is machined from the directions of arrows a, b, and C to form a rectangular parallelepiped protrusion with a width W. It is also manufactured by machining. During this machining, burrs are generated as shown in Figure 3, but the size of the burrs is l]
is about 100 μm to several 100 μm.

Traditionally, barrel polishing is used to remove burrs.

Although various methods such as Bell 1-polishing were carried out, burrs of several μm to several 10,711,71 mm in size remained after the deburring process. In the case of minute burrs of 10 /l m or less, the conventional technique involves grinding in the plastic deformation region, making it difficult to remove the burrs.

12° This residual burr has a residual strain due to mechanical deformation compared to the raw material. In particular, during mechanical processing, plastic deformation and elastic deformation are combined, so the residual burr in the layer becomes chemically active, and when this material is connected to copper, which is a different conductor, , an electrolyte solution, e.g.
By processing while adding a 3% ferric chloride solution, burrs can be reduced. When measured, the reduction in areas other than burrs was 0.01 μm or less.

That is, in this embodiment, using the deburring apparatus shown in FIG.
For machining, a nylon brush with an outer diameter of φ700 rn containing abrasive grains of alumina oxide #600 was used, pure copper was used for the conductor 7, and a 0.3% ferric chloride solution was used for the machining fluid 13. While rotating the rotating brush 3 at 900 revolutions per minute, the workpiece 1 is placed on the processing rotating brush 3 for about 5 m.
As a result of machining by moving up and down 10 times per minute, the size of the burr from the previous machining was determined to be several 1. O0μ
It was possible to reduce the residual burr to within 1-μ■1. At this time, the rotating brush 3 for processing works on the workpiece 1.
Because it acts strongly on the edges of the workpiece, many of the edges with residual burrs are machined, and the flat parts are hardly machined, so the change in the absolute dimensions of the workpiece was within 1 μm. In this example, two types of electrodes are used including the workpiece, but the number of electrodes is not limited to two types.

[Example 2] In Example]-, a DC power source was used for the power supply 8, a 0.1% ferric chloride solution was used for the machining fluid 13, and the result of machining with the rotating brush 3 while applying a voltage of 5 V was obtained. Without applying a voltage, the residual burr could be reduced to within 1 μm in about the same time as when using a 0.3% ferric chloride solution.

[Example 3] In Example 2, a copper wire was used as the rotating machining brush p-, and the workpiece 1 and the machining rotary brush 3 were treated with a 3% ferric chloride solution in the machining liquid 13. voltage between 5
By processing while applying (2), a residual burr of approximately 1 μm was obtained. By using a conductor for the two-phase rotary brush 3 as in this embodiment, the conductor 7 shown in the second embodiment can be omitted, and the machining rotary brush 3
By applying electrocardiograms to the workpiece, the surface of the conductor can be
Since the surface becomes more active as it comes into contact with the workpiece and is scraped, the -sliding electrochemical action increases, making it possible to efficiently remove minute burrs.

In this embodiment, the case where copper wire is used has been described, but it goes without saying that similar effects can be obtained using other materials such as nickel, tin, iron, etc.

[Embodiment 4] An example in which the deburring apparatus shown in FIG. 1 is used to deburr parts for a magnetic disk drive shown in FIGS. 4 and 5 will be described.

FIG. 4 is a perspective view of a part for a magnetic disk drive to be applied, and FIG.
FIG.

In chamfering the inner periphery of the stainless steel ring-shaped part IB shown in FIG. 4, two-blow burrs of method h1 occur.

In this embodiment, the secondary burr is removed by using the deburring device shown in FIG.
If 3% ferric chloride is used, and the liquid is supplied from the outer peripheral surface, the liquid will scatter due to the rotational force and the supply efficiency will decrease.In order to increase the supply efficiency, the machining liquid is supplied from the machining liquid supply hole 5 and the rotary brush 3 for machining is used. A nylon brush with an outer diameter of 50 mm containing abrasive grains of alumina oxide with a grain size of 31,500 was
By rotationally moving the holding part 2 under the conditions of rotation and so that the outer circumferential surface of the rotary machining brush 3 acts on the inner circumferential surface of the workpiece IB, the burr before machining can be reduced to several tens of pm. The residual burr could be kept within 1 μm.

[Example 5] The deburring device is the deburring device shown in FIG. 1, in which the rotary machining brush 3 is stopped and the machining fluid supply nozzle is connected to high pressure generation means, that is, the device shown in FIG. 8. Use. Here, 14 is a machining fluid supply nozzle connected to high pressure generating means, 15 is an abrasive grain supply nozzle, 16 is an additive machining fluid supply nozzle, and the conductor 7 is made of nickel.

The workpiece is an aluminum alloy magnetic disk drive component IA similar to the example of Example 1.

That is, in Example 5, from the machining fluid supply nozzle 14,
Silicon carbide #120 supplied from No. 15 abrasive grain supply nozzle
A mixture of 0 grain size abrasive grains and 16 added sodium hydroxide with a concentration of 0.2% is sprayed directly onto the workpiece at a pressure of 50 x 10'pa. As a result of deburring, the remaining burr could be reduced to within 1 μm.

The machining fluid supply nozzle in this deburring device is
By making the angle for supplying the mixed liquid swingable, the mechanical action of the high-pressure injection of the mixed liquid can be made more effective. In addition, the machining efficiency is improved by machining while applying a voltage, and the same effect can be obtained even when using a lower concentration electrolyte solution than when no voltage is applied, as shown in Example 2.
This is the same as described in .

[Embodiment 6] Here, another embodiment of the second invention will be described with reference to an example in which a ferrite component is deburred as shown in FIG. 6-7.

Fig. 6 is a perspective view of the ferrite part to be machined, and Fig. 7 is Xl-X2 showing the burr generation part in the part of Fig. 6.
It is a line enlarged sectional view.

The ferrite component IC shown in FIG. 6 is M, -Z,.

It is made of alloy, and the grooves are ground from the direction of arrow d, and the dimensions h2. h, like 0.0
Burrs of about 5 to 1 μm are generated.

Even small burrs of this order pose a problem when manufacturing VTR heads, which are the applications of this ferrite component, so it is necessary to remove these burrs and keep the remaining burrs within 0.05 μm. Moreover, since this burr is hard but brittle, it will fall off and cause chipping when using normal mechanical methods, resulting in product defects.

Therefore, in this example, we aim to chemically activate the burr by processing strain, and remove minute burrs by applying mechanical force using a soft tool such as a nylon brush, or by electrochemical processing. be.

In other words, as the rotating brush 3 for addition, the wire diameter is 0.2 m.
The nylon brush M and the conductor 7 are made of tin, and by immersing them in 5% hydrochloric acid as the processing liquid 13 while connected to the object J, electrochemical Processing was accelerated and residual burrs were kept within 0.05 μm. Furthermore, if a voltage is applied by the power supply device 8 using a DC power supply in series with the local battery, the processing efficiency is further improved. That is, using 5% hydrochloric acid as the machining fluid 1.3, the soot as the conductor 7 and the workpiece were connected,
If an external voltage of 5V is applied and the processing is performed using the nylon rotating brush 3, it will be compared to the case where no external voltage is applied.
I was able to improve by 1-0 times or more.

In addition, in the -1- structure acid, a 1% hydrochloric acid solution was used as the processing solution, and 1μ of aluminum oxide was added to this solution as powdered abrasive grains.
By mixing rn and spraying this mixed solution onto the processed surface at a pressure of 20XI O''IPa, etching was performed without chipping, and residual burrs could be reduced to within 0.05 μn1.

Furthermore, in the above example, regarding the N i -Z 11-based ferrite 1~ material with a high specific resistance of 10゛Ω・m,
A similar effect was obtained.

According to each of the above embodiments, the number 1 generated by machining
When removing minute burrs of 0 μm or less, a rotating brush is used to remove the edge where minute burrs are easily deformed, in order to use a concentration or type of liquid that has extremely little chemical effect on the workpiece. The part is chemically active.
Processing (etching) chemically or electrochemically
Other than the burrs on the edges, which are easily processed,
゛It has the effect of allowing microscopic deburring to be performed without legalization.

In the above embodiment, the rotating direction of the processing rotary brush may be in one direction, but it goes without saying that it is better to reverse the rotation direction at regular time intervals in order to perform the processing efficiently.

Further, as for the method of applying a mixed liquid of abrasive grains and a chemical liquid to a workpiece, an example of high-pressure injection was explained in the above embodiment, but the present invention is not limited to this.

Although not particularly illustrated or explained, the workpiece may be placed in a liquid tank in which the mixed liquid is circulated at high speed.

〔Effect of the invention〕

As described above in detail, the present invention provides a microburr removal method that can remove minute burrs generated by mechanical action from a workpiece and suppress changes in the absolute thickness of the workpiece. equipment can be provided.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of a deburring device according to an embodiment of the present invention, FIG. 2 is a perspective view of a magnetic disk device component to be processed, and FIG. FIG. 4 is an enlarged view of part A showing the part where burrs occur, FIG. 4 is a perspective view of the part for a magnetic disk drive, and FIG. Fig. 6 shows a blowjob to be processed (explanation of symbols) 1. Workpiece, 3. Rotating brush for processing, 6. Machining fluid spouting hole, 8. Power supply, 1o. Machining fluid supply. Nozzle, 13... addition]: Liquid. 2. Holding part, 5. Machining fluid supply hole, 7. Conductor, 11. Liquid tank,

Claims (1)

[Claims] 1. A workpiece having burrs and a conductor having a conductivity different from that of the workpiece are brought into contact or connected, and the workpiece and the conductor are immersed in an electrolyte solution. A local battery is formed by the workpiece, the conductor, and the electrolyte solution, and at the same time deburring is performed in the electrolyte solution by a mechanical action using a mechanical deburring means, and an electrochemical action is superimposed on the mechanical action. A method for removing minute burrs, which is characterized by removing burrs using a burr. 2. The microdeburring method according to claim 1, wherein a voltage is applied to the local battery from an external battery. 3. Contact or connect a workpiece with burrs and a conductor having a different conductivity from that of the workpiece, immerse the workpiece and the conductor in an electrolyte solution, and remove the workpiece and the conductor. A local battery is formed with the electrolyte solution, and at the same time, an electrolyte solution containing fine particles is supplied to the workpiece at high pressure by a high-pressure supply means to apply a mechanical action to deburr the workpiece, and to apply an electrochemical action to the mechanical action. A microdeburring method characterized by deburring by superimposing . 4. Contact or connect a workpiece with burrs and a conductor having a conductivity different from that of the workpiece, immerse the workpiece and the conductor in an electrolyte solution, and remove the workpiece and the conductor. A local battery is formed with the electrolyte solution, a voltage is applied to the local battery from an external battery, and at the same time, an electrolyte solution containing fine particles is supplied at high pressure to the workpiece by a high-pressure supply means to apply mechanical action and burr. A microdeburring method characterized by deburring by superimposing electrochemical action on mechanical action. 5. A workpiece having burrs, a conductor having a conductivity different from that of the workpiece and contacting or connected to the workpiece, and a workpiece in which the workpiece and the conductor are immersed. A microdeburring device comprising: an electrolyte solution that forms a local electrode with an object and the conductor; and a mechanical deburring means that removes burrs by mechanical action in the electrolyte solution. 6. The microdeburring device according to claim 5, further comprising an external battery for applying voltage to the local electrode. 7. The microdeburring device according to claim 5, wherein the mechanical deburring means is a high pressure supply means for supplying an electrolyte solution containing fine particles to the workpiece at high pressure. 8. A workpiece having burrs, a conductor having a conductivity different from that of the workpiece and being in contact with or connected to the workpiece, and a workpiece in which the workpiece and the conductor are immersed. An electrolyte solution that forms a local electrode between an object and the conductor, and a rotating burr that removes burrs by rotating the tool in the electrolyte solution and using centrifugal force to supply machining fluid in the center of the tool to the workpiece. A microdeburring device characterized by having a removal tool. 9. A workpiece having burrs, a metal brush that deburrs the workpiece by a mechanical action having a conductivity different from that of the workpiece, and a metal brush in which the workpiece and the metal brush are immersed and the workpiece is immersed. A microdeburring device comprising an electrolyte solution forming a local electrode between the workpiece and the metal brush. 10. The microdeburring device according to claim 9, further comprising an external battery for applying voltage to the local electrode.