JPH11244954A - Manufacture of sheet parts - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method capable of surely removing burrs and other undesired shapes in a corner part of a sheet parts without giving significant deformation to the parts at a low cost in a manufacturing method of the sheet parts such as a ribbon mask. SOLUTION: A tip part of a punch 23 is provided with an inclined surface part 23a formed at the position corresponding to an inner edge corner part 11b of a frame-shaped projecting part 11, and a flat surface part 23b which is continuously formed on the outer peripheral side of the inclined surface part 23a. The inner edge corner part 11b of the frame-shaped projecting part 11 is pressed by the inclined surface part 23a, and a surface of an opening edge part continuous to the outer peripheral side of the inner edge corner part 11b is also pressed by the flat surface part 23b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a sheet-like part.

[0002]

2. Description of the Related Art Conventionally, in an impact dot printer or the like, an ink ribbon impregnated with printing ink is provided in a predetermined direction. On one side of the ink ribbon, a paper feed path is formed, and on the other side of the ink ribbon, a printer head having a large number of pins that can freely move in and out via a ribbon mask having a print opening is arranged. You. Then, while feeding the paper along the feeding path, the pins are protruded from the printer head to pierce the ink ribbon through the printing opening of the ribbon mask, and the ink is transferred onto the surface of the paper disposed on the opposite side. Has become.

FIG. 3 shows the shape of the ribbon mask. The ribbon mask 10 is manufactured by processing a plate-like material made of an extremely thin stainless steel of less than 0.1 mm by a plastic working process such as press working. In this plastic working process, first, a plate-shaped material made of thin stainless steel is projected in a plane rectangular shape at the center by drawing by a press to form a drawn portion in which the projected portion is formed flat. I do. Next, a printing opening 11a is formed by punching the center of the drawn portion into a rectangular plane. Due to the formation of the printing opening 11a, the drawn portion is left in a frame shape and the frame-shaped protrusion 11
Becomes

In the ribbon mask 10, a part of the horizontally arranged ink ribbon 12 faces the printing opening 11a, and the frame-shaped protruding portion 11 is oriented in the printer with the protruding side facing the paper side. Supported. At the time of printing, the paper (not shown) is configured to be fed in the vertical direction in the figure along the paper feed path so as to slide on the frame-shaped protrusion 11.

Since the ribbon mask 10 is formed by pressing, burrs and the like are formed at the corners by pressing. In particular, burrs as shown in FIG. 4 are formed at the inner edge corners 11 b of the printing opening 11 a formed inside the frame-shaped protrusion 11 in the projecting direction of the frame-shaped protrusion 11. These burrs must be completely removed because they come into contact with the paper and cause paper jams and paper damage. Therefore, conventionally, burrs at the inner edge corners 11b of the frame-shaped protrusion 11 have been removed by electrolytic polishing, barrel polishing, or the like.

[0006]

However, since the burrs at the inner edge corners 11b of the frame-shaped protrusion 11 are conventionally removed by electrolytic polishing or barrel polishing as described above, an extremely thin ribbon mask 10 is required. It is necessary to perform a polishing process so as not to cause deformation, and it is necessary to remove burrs at the corners of the inner edge of the print opening 11 without fail. However, there is a problem that the production cost is increased and the production efficiency is reduced by the finishing process.

On the other hand, after the ribbon mask 10 having the shape shown in FIG. 3 has been formed, as shown in FIG. It is conceivable to perform face pressing on 11b. However, in this method, if the face pressing is insufficient, the burrs cannot be completely removed, or the burrs 11e and 11f are formed in the plastically deformed portions as shown by dotted lines in FIG.
Is formed, the remaining burrs and the burrs 11e generated on the surface side are caught on the paper and clog the paper, or the paper is damaged. Further, if the surface pressing is excessively performed, the surface shape of the frame-shaped protruding portion 11 is greatly deformed, and there is a problem that distortion is generated and the quality of the ribbon mask is deteriorated.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to provide a method of manufacturing a thin plate-like component such as a ribbon mask by removing burrs and other undesired shapes at corners of the thin plate-like component. It is an object of the present invention to provide a method that can be reliably removed at low cost without causing significant deformation of a component.

[0009]

Means taken by the present invention for solving the above-mentioned problems is to form a corner between a plate surface and an end surface of a thin plate-like component into an inclined surface, A pressurizing member that is connected and has a pressurizing surface portion formed in a shape substantially along the surface of the thin plate-shaped component so that an angle with respect to the plate surface is smaller than the inclined surface portion. A method for manufacturing a thin plate-shaped component, comprising a step of pressing the corner portion with a surface portion and pressing the plate surface with the pressing surface portion to plastically deform the corner portion.

According to this means, the vicinity of the edge including the corner of the thin plate-shaped component is simultaneously pressed by the inclined surface of the pressing member and the pressing surface connected to the pressing member so as to be plastically deformed. As a result, insufficient pressurization of the corners of the thin plate-shaped part does not occur, burrs and burrs are prevented, and the shape from the plate surface to the end surface can be smoothly formed. Since the plate surface is pressed by the surface portion, it is possible to prevent the thin plate-shaped component from being seriously deformed or distorted, and it is possible to reduce the manufacturing cost.

In order to generate plastic deformation by applying pressure by the pressing member as described above, it is usually necessary to provide some support member for supporting the plate surface of the thin plate-shaped component from the opposite side.
The shape of the support member is desirably a flat surface when the plate surface on the opposite side of the thin plate-shaped component is flat, and is fitted to the plate surface when the plate surface is not flat, It is desirable that the surface shape corresponds to the plate surface. By doing so, it is possible to prevent deformation of the pressurized portion of the thin plate-like component, and to more reliably and highly precisely because the thin plate-like component is uniformly supported by the pressing action of the pressing member. This is because corners can be formed.

Here, before the face pressing step, the thin plate-shaped component is moved from the other plate surface opposite to the one plate surface adjacent to the corner to the one plate surface. It is preferable to include a punching step of cutting the plate-like material with a cutting member to form the corners. According to this means, there is a punching step before the face pressing step,
Since the punching side corners in the punching process are face pressed, burrs generated by the punching can be removed by face pressing.

In each of the above-mentioned means, the thin plate-shaped component is a ribbon mask having a printing opening interposed between an ink ribbon and a printing sheet in a printer, and the corner portion is formed by the printing opening. Preferably, it is the inner edge corner of the portion. According to this means, the inner edge corner of the printing opening in the ribbon mask is face-pressed, thereby preventing the ribbon mask from being caught on the print sheet and causing damage to the print sheet by an inexpensive method without deforming the ribbon mask. be able to.

Further, in each of the above-mentioned means, it is preferable that the thin plate-shaped part is made of stainless steel. It is particularly difficult to remove burrs of stainless steel by face pressing, but according to the present invention, burrs and the like can be reliably removed, and a smooth plate surface end can be realized.

In each of the above means, the thin plate-shaped part is particularly effective when the plate thickness is less than 1 mm. If the plate thickness is thin, deformation and distortion of the parts are likely to occur, which is troublesome and costly, and the conventional polishing method may cause deterioration in the quality of the parts, whereas the present invention may cause deformation and distortion. The corners can be formed easily and inexpensively. Particularly in the case of stainless steel, it can be applied sufficiently even when the plate thickness is less than 0.1 mm, and is extremely effective.

[0016]

Next, an embodiment according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is a process chart showing an embodiment of a method for manufacturing a thin plate-shaped component according to the present invention.
In the present embodiment, the present invention is applied to the method of forming the above-described ribbon mask 10 shown in FIG. In the manufacturing process of the ribbon mask 10, a flat rectangular flat hill-shaped protrusion is formed by subjecting a stainless steel plate-shaped material to drawing by a press machine, and pressing is performed at the center of the protrusion. The printing opening 11a is formed by punching with a machine, and the frame-shaped protrusion 11 is formed at the opening edge.

In the above punching process, FIG.
As shown in (a), a punch 21 having a rectangular cross section is arranged on the projecting side of the projecting portion, and a die 22 having a rectangular hole is arranged on the opposite side of the punch 21. Punch out. At this time, the inner edge corner 11b of the plate-shaped material formed on the opening edge of the printing opening 11a formed by the punching process on the punching direction side, that is, the end face facing the printing opening 11a and the plate surface. Burrs projecting in the punching direction occur at the corners between them.

Next, a punch 23 is arranged on the side where the inner edge corner 11b is formed, and a die 24 having a flat support surface near the printing opening 11a is arranged on the opposite side. The surface shape of the entire die 24 has a shape substantially corresponding to the molding surface of the ribbon mask 10 shown in FIG. 3, that is, a surface shape having a hill-shaped protrusion at the center. The punch 23 is moved from a direction opposite to the punching direction while supporting the frame-shaped protrusion 11 by a support surface formed at the center of the surface of the die 24, and the inner edge corner 11b of the printing opening 11a and the punch 23 are moved. The plate surface of the surrounding frame-shaped protrusion 11 is pressed, and the inner edge corner 11b is subjected to face pressing.

At the tip of the punch 23, a frame-like projection 11 is provided.
And a flat surface portion 23b formed continuously on the outer peripheral side of the inclined surface portion 23a. For this reason, the inner edge 11b of the frame-shaped protrusion 11 is press-formed by the inclined surface 23a to form a tapered surface 11c, and the surface of the opening edge following the outer peripheral side of the inner edge 11b is also flat.
b to form a slightly recessed flat edge 11d.

FIG. 2 is an enlarged sectional view showing a processing state in the surface pressing. As the shape of the punch 23,
The surface pressing width A of the inclined surface portion 23a in the figure is 0.030 mm,
The pressure width B of the flat surface portion 23b is designed to be 0.320 mm, and the inclination angle E of the inclined surface portion 23a is designed to be 50 degrees. Further, the thickness D of the frame-shaped protrusion 11 is 0.080 mm, and the amount of press deformation C indicating the amount of depression caused by plastic deformation by being pressed by the flat surface portion 23b is 0.010 mm. The position of the bottom dead center of the punch 23 with respect to the die 24 is designed.

With respect to a plurality of sample products subjected to surface pressing by press working using the punch 23 and the die 24, the surface pressing width A, the amount of pressing deformation C, and the thickness D after working were measured. . Table 1 shows the results.

[0022]

[Table 1]

Here, the surface pressing width A is smaller than the design value of the mold because the frame-shaped protruding portion 11 is deformed by pressurization by the punch 23 and the die 24 and the plate is brought into the printing opening 11a. Is also a large value. When designing the surface pressing width A, the surface pressing width A is 0.056 to 0.06 m.
m, the amount of increase in width due to material deformation is 0.0
The die shape of the punch 23 is determined in consideration of 26 to 0.03 mm.

When designing the pressing width B, the inner edge corner 11
The width b is determined to have a sufficient width so as not to generate a flash portion by crushing the burr. In the present embodiment, the pressing width B is set to a value larger than the width for sufficiently suppressing the generation of the burrs, and a sufficient margin is secured.

It is not always necessary to have the amount of pressure deformation C generated by the pressing of the flat surface portion 23b. However, if the amount of pressure deformation C is set to zero, there is a variation in the thickness of the ribbon mask due to variations in the thickness of the ribbon mask and the like. Since it may be considered that the pressure is not sufficiently applied, the pressure deformation amount C is set so as to slightly occur. In addition, the amount of pressure deformation C
May be very small. However, when it is desired to reduce the amount of a step generated on the outer edge of the flat edge portion 11d due to the amount of pressure deformation C or to suppress the steepness of the step, the flat surface portion 23b May be formed with a tapered surface or an R surface on the outer edge.

The thickness D after molding was determined based on the thickness required for the opening edge of the printer opening 11a of the ribbon mask, and the amount of deformation C was set in accordance with the thickness.

The value of the inclination angle E is based on the case where a C plane (a plane having an inclination angle of 45 degrees) is formed at the inner edge corner 11b.
In order to limit the amount of deformation of the inner edge corner portion 11b to some extent due to the balance with the surface pressing width A, it was necessary to reduce the amount of pushing of the plate below the punch 23, so that it was set slightly higher than the C surface reference. In practice, the angle was set to 50 degrees so as to fall within the range of 49 degrees to 51 degrees.

In the present embodiment, the vicinity of the opening edge including the inner edge corner portion 11b of the frame-shaped protrusion 11 is pressed by the inclined surface portion 23a and the flat surface portion 23b subsequent thereto, and the inner edge corner portion 11b is crushed by the inclined surface portion 23a. A tapered surface portion 11c formed in a C-plane shape is provided, and a flat edge portion 11d is formed continuously with the tapered surface portion 11c. Therefore, the burrs shown in FIG. 4 are not formed between the tapered surface portion 11c and the flat edge portion 11d, and the surface portion from the inner end surface of the print opening 11a to the plate surface of the frame-shaped protrusion 11 is not formed. It is possible to have a smooth surface shape.

Here, the shape of the inclined surface portion 23a need not be a cross-sectional shape having a linear contour as shown in FIG. 2, but may be a concave curved surface. The shape of the tapered surface portion 11c formed by the inclined surface portion 23a may be an R surface or another convex curved surface, or may be a drooping surface (not completely formed by the inclined surface portion 23a and the flat surface portion 23b,
The surface may have a surface shape that is gently continued from the illustrated tapered surface portion 11c to the flat edge portion 11d).

The flat surface portion 11d is basically formed with an inclined surface portion 23a.
And the frame-shaped protrusion 11
It is only necessary to be formed substantially along the plate surface, and it is not necessary to be completely flat or to be completely parallel to the plate surface.

In the above embodiment, an example in which the present invention is applied to the inner edge corner of the printer opening 11a of the ribbon mask has been described. However, the present invention is not limited to such a case, and the present invention is not limited to such a case. It can be applied to corners.

It is desirable that the shape of the die 24 basically has a flat supporting surface with respect to the flat surface of the ribbon mask. This is because the pressing action received from the punch 23 as the pressing member can be uniformly received at the inner edge corner of the frame-shaped protrusion after the plastic deformation. However,
If the cross-sectional shape of the frame-shaped protrusion is not flat or the thickness is uneven, the surface (support surface) of the die 24
It is necessary to make the shape conform to the shape on the back side of the frame-shaped protrusion.

Since the ribbon mask is formed of a very thin plate-shaped material having a thickness of less than 0.1 mm, it is difficult to completely remove burrs without causing deformation or distortion by the conventional method. This has led to an increase in manufacturing costs and a decrease in production efficiency. The method of the present embodiment is particularly effective when applied to a thin plate-shaped material having a thickness of less than 1 mm from the viewpoint of cost and molding accuracy, and is more effective for a relatively hard material such as stainless steel. It is extremely effective even when the thickness is less than 1 mm. In the present embodiment, since the corner portion shape can be formed without any trouble even with such a thin plate-shaped material, a high-quality thin plate-shaped component can be manufactured at low cost and with high production efficiency. This is a very remarkable effect in practical use.

[0034]

As described above, according to the present invention, the vicinity of the edge including the corner of the thin plate-shaped component is simultaneously pressed by the inclined surface of the pressing member and the pressing surface connected thereto. Because it is plastically deformed, there is no shortage of pressure on the corners of the thin plate part, preventing burrs and burrs, etc., and smoothly forming the surface shape from the plate surface to the end surface In addition, since the plate surface is pressed by the pressing surface portion, it is possible to prevent the thin plate-shaped component from being seriously deformed or distorted, and it is possible to reduce the manufacturing cost.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a processing state of a punching step and a face pressing step in an embodiment of a method of manufacturing a thin plate component according to the present invention.

FIG. 2 is an enlarged cross-sectional view showing a processing state of a face pressing step in the embodiment.

FIG. 3 is an explanatory perspective view showing a schematic shape of a ribbon mask.

FIG. 4 is an enlarged cross-sectional view showing a cross-sectional shape of a corner portion on which a burr is formed in a thin plate-like component, together with a state (dotted line) in which a punch having only an inclined surface portion is pressed.

FIG. 5 is a schematic cross-sectional view showing a state of a face pressing step for removing burrs at corners of the thin plate-shaped part.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Ribbon mask 11 Frame-shaped protrusion 11a Printing opening 11b Inner edge corner 11c Tapered surface 11d Flat edge 23 Punch 23a Inclined surface 23b Flat surface 24 Die

Claims (5)

[Claims] 1. A corner between a plate surface and an end surface of a thin plate-shaped part is connected to the inclined surface, and the angle with respect to the plate is smaller than that of the inclined surface. A pressing member having a pressing surface portion formed substantially along the surface of the thin plate-shaped component is used to press the corner portion by the inclined surface portion and to apply the plate surface by the pressing surface portion. A method of manufacturing a thin plate-shaped part, comprising a face pressing step of plastically deforming the corner by pressing. 2. The thin plate-like part according to claim 1, wherein, prior to the face pressing step, the other plate surface of the thin plate-shaped component, which is opposite to the one plate surface adjacent to the corner, is moved to the one plate surface. A method for manufacturing a thin plate-shaped part, comprising a punching step of cutting the plate-shaped material with a cutting member moving toward the corner to form the corner. 3. The thin plate-shaped component according to claim 1, wherein the thin plate-shaped component is a ribbon mask having a printing opening interposed between an ink ribbon and a printing sheet in a printer, and the corner portion is A method for manufacturing a thin plate-shaped component, wherein the edge is an inner edge corner of the printing opening. 4. One of claims 1 to 3
In the above item, the method for producing a sheet-like part is characterized in that the sheet-like part is made of stainless steel. 5. The method according to claim 1, wherein:
In the above item, the thin plate-shaped component has a thickness of less than 1 mm.