JP2001038625A - Parts machining method in flat work - Google Patents

Abstract

PROBLEM TO BE SOLVED: To machine parts of beautiful finish with excellent yield at a low cost from a flat work. SOLUTION: In this machining method, the masking to cover a part to be a core (parts) 2 of a work 1 by a masking material 3 is implemented in advance. A flat, soft backing member 6 is stuck on a base plate 4 by a lower adhesive 5a, and fixed thereto, and the masked work 1 is stuck on the soft backing member 6 by an upper adhesive 5b and fixed thereto. The fixed work 1 is mounted on a sand blasting machine together with the base plate 4, and the parts are obtained by blasting a through groove 9 to form an outer circumferential contour surface 2c of the core 2 along the outside of the outer circumferential contour shape of the core 2 without any masking material 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of processing a component on a flat work suitable for obtaining a component such as a core used for a magnetic head such as a video deck or a tape recorder from a flat work. .

[0002]

2. Description of the Related Art Conventionally, components such as a core for a magnetic head are prepared by converting a flat work made of carbon into a dedicated jig,
It is formed by attaching to a support such as a pallet, setting it on a work table of a punch press or other press machine, and punching out with a punching tool.

[0003]

However, in the conventional processing method, since a so-called burr is formed around a part punched out by shearing, post-treatment for removing the burr is required, and the required man-hour is increased. In particular, when the work is a thin brittle material, the work and the punched parts are broken at the time of punching, and the product yield is poor. Further, since the punched parts scatter from the workpiece made of the material, a device for suppressing the scatter of the parts and collecting the parts is required. Furthermore, since a work made of a thin-walled brittle material is easily broken, there is a problem that the handling is troublesome and a special support is required for installation on a press machine.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and has been made in consideration of the above problems, and has been made in consideration of the above problems. It is intended to provide a processing method. It is another object of the present invention to provide a method of processing a component in a flat work in which a defective rate in processing can be suppressed as small as possible and a component can be obtained from the workpiece at low cost. . Still another object of the present invention is to provide a method of processing a component in a flat workpiece in which handling of the workpiece is simple and components can be easily recovered from the workpiece.

[0005]

In order to achieve the above object, according to the first aspect of the present invention, a flat work in which the contour of a part to be a part is covered with a mask material is attached to the work with an adhesive. The bonded soft backing member is interposed and fixed to the base plate, and a through groove is formed by sandblasting in a portion of the work not covered with the mask material by sandblasting to obtain a component. In the method of the above configuration, when forming a through groove along the contour shape of the component by sandblasting, the impact by the bead injection pressure on the work is moderately absorbed and buffered by the soft backing member, so that the through groove is formed. The scattering of the bead that works and rebounds on the contour surface of the part is suppressed,
The peripheral surface of the contour is smoothly formed without being damaged, and no burrs are formed on the peripheral surface of the part corresponding to the penetrating side of the through-groove. Further, the obtained component is fixed to the soft backing member by an adhesive, and does not scatter.

In the method according to the first aspect, the soft backing member is made of a polyurethane resin.
The absorption and shock buffering effects of the beads by the injection pressure are optimized, and the components can be formed more favorably. The method according to claim 1 or 2, wherein the work is fixed to the base plate with an adhesive adhered to both surfaces of the soft backing member (claim 3). On the base plate,
The workpiece can be easily handled with a sand blasting machine or the like, and the parts can be cut from the workpiece with high accuracy.

In the method according to any one of claims 1 to 3, the work may be made of carbon (claim 4) and any one of claims 1 to 4. In one of the methods described above, the work may be a core for a magnetic head. With these configurations, machining of a part from a work made of a thin brittle material is performed safely and easily without causing damage.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to processing of a core for a magnetic head will be described below with reference to the accompanying drawings. In the figure, reference numeral 1 denotes a rectangular thin plate-shaped work (material) which is made of carbon.
The work 1 is set to such a size that a large number of cores (parts) 2 for a magnetic head are arranged vertically and horizontally. The core 2 is provided with recesses 2a on both sides of a small disk.

When the core 2 is formed from the work 1, a portion of the work 1 which is to be the core 2 is previously masked by the mask material 3.
A masking process for covering with (FIG. 2) is performed. The mask material 3
Any material may be used as long as it has good adhesion to the carbon of the work 1, but usually a resist film for photo processing is used. This film is coated on the work 1, the core 2 is molded, and a large number of arrangement patterns are arranged on the film as described above. Then, masking is performed by removing the mask material in the portion where the core 2 is not formed. The process ends.

Next, as shown in FIG. 2, a flat soft backing member 6 is attached and fixed on a base plate 4 supporting a work such as a jig or a pallet with a lower adhesive 5a. Then, the masked workpiece 1 is attached and fixed on the soft backing member 6 with the upper adhesive 5b. As the soft backing member 6, a polyurethane resin that supports the work 1 with appropriate rigidity and has physical properties effective for reducing the rebound force of beads used for blasting is preferable. Other synthetic polymer materials having, for example, acrylic rubber,
Chloroprene rubber, acrylic resin, epoxy resin,
Nylon-based resin, phenol-based resin, and silicone-based resin can be used. As described above, the work 1 fixed on the base plate 4 is carried into a sand blasting machine by a handling device as appropriate, mounted on the work table, and the core 2 Blast processing for forming a through groove 9 along the contour shape 8 is performed.

In the above-mentioned blasting, the beads to be used may be irregular, cubic, rectangular, or polyhedral.
Any material may be used as long as it has a corner for shaving the carbon plate. The material is silicon carbide (SiC) or manganese oxide (MnO) in consideration of contamination of the carbon plate.
Is appropriate. Using a bead (amorphous) having a particle size of 3 to 200 μm, a shot pressure of 1 kg at the outlet of the nozzle 7
The beads are evenly sprayed on the carbon plate as the work 1 at a pressure of / cm ^{2 to 5} kg / cm ² to perform blast processing.

In the above-mentioned blasting, beads are ejected with the nozzle 7 being directed vertically downward with respect to the work 1, and the nozzle 1 is moved by the relative movement between the nozzle 7 and the work 1.
Are continuously moved along the outside of the contour shape of the outer periphery of the core 2, and the through groove 9 is formed by this one-step movement.
As a result, the inner wall surface 9a of the through groove 9 coincides with the inner wall surface 9a.
The core 2 having the outer peripheral surface 2 c perpendicular to the b is formed separately from the work 1 by the through groove 9. Since the core 2 separated from the work 1 in this manner is adhered to the soft backing member 6 by the adhesive 5b, the core 2 is not scattered by the bead injection pressure or the like.

In the above description, the portion which becomes the core (part) 2 of the work 1 to which the mask material 3 is in close contact is the outer peripheral surface 2
The inner contour along c is protected by the mask material, thereby maintaining the flat surface of the original carbon plate,
The portion outside the outer peripheral contour surface 2c that is not covered with the mask material 3 is smoothly shaved by the corners formed in the irregular shaped beads, thereby separating the core 2 from the work 1 and finishing the outer peripheral contour surface 2c. A required through groove 9 is formed.

After the processing of the core 2 is completed by forming the through groove 9 for separating the core 2 from the work 1 as described above, the work (remaining work material) 1a after the core separation is blasted together with the base plate 4. The adhesives 5a and 5a are removed from the processing machine and appropriately washed with an alkaline solution or the like.
b is removed. As a result, the work remaining material 1a and the core 2 are removed from the base plate 4 and are completely separated from each other. Therefore, the core 2 is separated from the work remaining material 1a, dried, and collected as a product. In the above description, the formation of the through groove 9 for separating the core 2 from the work 1 can be performed one by one with respect to the core 2 on which the work 1 is to be formed by one nozzle 7, but usually, from the viewpoint of efficiency. This is performed simultaneously on a plurality of cores 2 using a plurality of nozzles.

According to the method of processing the core 2, the work 1
The penetration groove 9 is formed in the outer peripheral contour surface 2c of the core 2 by the injection of beads from a nozzle directed perpendicularly to the work 1, but since the soft backing member 6 is interposed on the back surface of the work 1, The backing member 6 appropriately absorbs and cushions the impact on the work 1 due to the injection pressure of the beads. For this reason, when the bead is punched into the workpiece 1 and the through groove 9 is formed, the bead is not rebounded from the soft backing member 6 and scattered on the outer peripheral surface 2c of the core 2 to damage the core. The contour surface 2c can be finished smoothly. In addition, since the soft backing member 6 reliably supports the core 2 side at the time of punching and facilitates the cutting operation of the work 1 by the beads, burrs occur on the outer peripheral contour surface 2c on the through side 9b of the through groove 9. No post-processing work for removing burrs from the core 2 is required.

The method of forming the through groove 9 is not limited to the above. For example, instead of finishing the entire cross section of the through groove 9 in one step of making one round of the outer peripheral contour of the core 2, the through groove 9 is divided into a plurality of sections in the depth direction, and the depth of the groove is increased step by step. The finishing may be performed through a number of steps corresponding to the number of sections, or another appropriate method of forming a through groove may be employed.

In the above embodiment, the work 1 is fixed on the base plate 4 by the adhesives 5a and 5b adhered to both surfaces of the soft backing member 6, so that the work 1 can be securely fixed. Although it is preferable because the handling can be easily performed on the upper side, the soft backing member 6 to which the work 1 is attached without attaching an adhesive to the lower surface of the soft backing member 6 is appropriately fixed to the base plate 14 instead. You may make it fix using a tool.

Further, in the above embodiment, the component (core 2) has a circular outer contour with concave portions provided on both sides of a circular shape, but the outer contour of the component is not limited to this. Instead, the part may be a circle, a square, or the like, and the above-mentioned parts are processed only in the outer peripheral part, but may be hollow parts having a processed part in the center. In this case, the through-groove is formed along the inner peripheral contour shape of the component, and the forming method is the same as the case of forming the outer peripheral contour shape. The outer peripheral surface 2c of the component is perpendicular to the surface of the component, and the through groove 9 is formed perpendicular to the surface of the workpiece 1. However, the groove is not limited to the above, and the outer peripheral surface of the component is not limited to the above. Can be formed in an inclined manner in accordance with the shape of the surface of the surface, an arc shape, or another shape.

Further, in the above embodiment, the mask material is formed so as to cover the entire surface of the component with a film obtained by molding the component (core 2).
It is not always necessary to cover the entire surface of the component, and in the case of a relatively large component, it may cover an appropriate range of the contour of the component, and a mask material of an endless linear portion along the contour of the component. And may be formed as a film covered with a film from which. Furthermore, in the above-described embodiment, since the support plate such as a jig or a pallet is used as the base plate 4 for supporting the work 1, the work 1 can be easily handled, which is convenient. The processing table of the machine may be used.

In the above embodiment, the case where a carbon plate is used as the work 1 has been described. However, the present invention is not limited to this, and a ceramic plate, a silicon plate, or a metal plate may be used. Further, in the above embodiment,
Although the case of processing the core 2 of the magnetic head has been described, the present invention is not limited to this, and may be applied to processing of parts of other electronic devices and other products.

[0021]

As described above, the first aspect of the present invention is:
A flat work in which the contour of a part to be a part is covered with a mask material is fixed to a base plate with a soft backing member joined to the work with an adhesive, and the work is covered with a mask material of the work. A through-groove is formed by sandblasting along the contour shape of the part in the part where there is no part to obtain the part.

According to the above construction, when the through groove is formed along the contour of the component by sandblasting, the impact by the bead injection pressure on the work is appropriately absorbed and buffered by the soft backing member, so that the through groove is formed. The peripheral surface of the component is not damaged by the beads that bounce off the surface, and no flash is generated on the peripheral surface of the component on the penetration side of the through groove, eliminating the need for post-processing for deburring. Can be. Therefore, parts with a good yield and a beautiful finish can be obtained efficiently and inexpensively. In addition, since the obtained component is fixed to the soft backing member with an adhesive, the component can be reliably collected without scattering during processing as well as during processing of the work.

According to the second aspect of the present invention, since the soft backing member is made of the polyurethane resin, the shock absorbing and buffering effects due to the injection pressure of the beads are optimized, and the formation of the through groove is improved. And a higher quality part can be obtained. According to the third aspect of the present invention, since the work is fixed to the base plate with the adhesive adhered to both surfaces of the soft backing member, the work is closely fixed to the base plate together with the soft backing member. Thus, the workpiece can be easily handled with a sandblasting machine or the like, and the component can be cut from the workpiece with high accuracy.

According to the fourth and fifth aspects of the present invention, the work is made of carbon and is used as the core of the magnetic head.
It can be safely and easily implemented without causing any damage to parts.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a work.

FIG. 2 is a sectional view showing an embodiment of the present invention.

[Explanation of symbols]

Reference Signs List 1 work 2 core (parts) 2c outer peripheral contour surface 3 mask material 4 base plate 5a, 5b
Adhesive 6 Soft backing member 7 Nozzle 8 Contour shape 9 Through groove

Claims (5)

[Claims] A flat work in which a contour of a part to be a part is covered with a mask material is fixed to a base plate via a soft backing member joined to the work with an adhesive, and a mask for the work is provided. A method for processing a component in a flat work, wherein a through groove is formed by sandblasting in a portion not covered by a material by a sandblast. 2. The method according to claim 1, wherein the soft backing member is made of a polyurethane resin. 3. The method according to claim 1, wherein the work is fixed to the base plate by an adhesive adhered to both surfaces of the soft backing member. 4. The method according to claim 1, wherein the workpiece is made of carbon. 4. The method according to claim 1, wherein the workpiece is made of carbon. 5. The method according to claim 1, wherein the work is a core for a magnetic head.