JPH0796340A - Method for forming roll for coining - Google Patents

Abstract

PURPOSE:To provide a forming method for a coining roll where a fine projecting pattern can be easily formed on the roll surface, and the bearing part and the roll surface can withstand a large rolling reduction force. CONSTITUTION:A surface tool 1 where the recessed pattern is formed on the upper surface of a plate and a cylindrical roll 3 having bearing parts 2 on both end parts are provided, the surface tool is supported so as to allow the parallel movement to its upper surface, the bearing parts are supported so that the roll may be movable in the vertical direction to the upper surface of the surface tool, the surface tool is moved parallel to its upper surface while the roll is pressed to the surface tool, and the projecting pattern is formed on the roll surface thereby.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for processing a coining roll, and more particularly to a method for processing a coining roll for forming a fine recessed shape on a flat plate by plastic working.

[0002]

2. Description of the Related Art When a fine surface shape is given to a product surface by plastic working, a coining roll working method of giving a shape to a flat plate surface by rolling a roll is a small rolling reduction as compared with a flat forging such as coining. A large area can be continuously processed by force, and it has high productivity and high accuracy. For example, 30mm for coining
When giving a fine shape to a flat plate of × 30 mm (900 mm ² ), assuming that the average surface pressure is 30 kgf / mm ^2, it will be about 2
A rolling force of 7 tons is required, and in actuality, rolling down equipment of 50 tons or more is required in consideration of uneven surface pressure.
Therefore, in order to obtain a product having a larger area, larger equipment is required. On the other hand, in the coining roll processing, the contact width between the coining roll and the flat plate is very narrow (for example, about 1 to 2 mm), and since the endless processing can be performed in the length direction, a long rolling can be performed with a relatively small rolling force. Scale products can be easily processed.

[0003]

However, in the above-mentioned coining roll processing, the coining roll is indispensable, and there is a problem that the surface processing of this coining roll is difficult. Particularly, the surface of the coining roll needs to be sufficiently harder than that of the flat plate material to be processed by the coining roll. Therefore, the surface is hardened by quenching or the like, so that there is a problem that fine processing is more difficult. Further, when a concave pattern is added to the flat material, it is necessary to form a convex pattern on the coining roll, but it is generally difficult to form such a convex pattern on the roll surface.

That is, laser processing, cutting processing, electric discharge processing, etc. have been conventionally known as a method for processing the fine surface shape of a roll. However, the conventional method has the problems of fineness, freedom of shape control, and processing efficiency. The processing method of 1 had the following problems. A tool having a fine surface shape needs to be replaced or regenerated as appropriate due to wear and the generation of deposits during use, but the conventional method has a weak point that it takes time to manufacture a roll. A method similar to a normal drive type roll (rolling) tends to increase the size of equipment and makes it difficult to delicately control the operation. Fine processing of the roll surface is generally more difficult than flat processing, and it takes time to process the entire area of the circumferential surface. When performing fine surface processing on the roll surface by plastic working, if a load that causes sufficient surface deformation is applied by using an ordinary integrated roll, the load on the bearing and contact surface pressure will become excessive, and bending at the bearing will occur. And surface deformation easily occur. Processing tends to be uneven along the axial direction of the roll.

The present invention was created to solve the above problems. That is, an object of the present invention is to provide a method for processing a coining roll that can easily form a fine convex pattern on the roll surface and can withstand a large rolling force at the bearing portion and the roll surface.

[0006]

According to the present invention, a flat tool having a concave pattern formed on the upper surface of a flat plate and a cylindrical roll having bearing portions at both ends thereof are provided, and the flat tool is provided with respect to the upper surface. It is supported so that it can be moved in parallel, and its bearing is supported so that the roll can move vertically to the upper surface of the flat tool, and the flat tool is moved in parallel to the upper surface while pressing the roll against the flat tool. Provides a method for processing a coining roll, which comprises forming a convex pattern on the roll surface.

According to a preferred embodiment of the present invention, the cylindrical roll comprises an outer skin portion having a convex pattern formed on its surface, and a core portion axially penetrating the outer skin portion and having bearing portions at both ends. The outer skin portion is softer than the flat tool, the core portion has higher strength than the outer skin portion, and after forming the convex pattern on the roll surface, the hardness of the outer skin portion is increased. In addition, the outer skin portion has a crown whose center portion bulges outward slightly on the surface thereof, and the crown is of a size suitable for coining a flat plate after forming a convex pattern on the roll surface. Is preferred.

[0008]

According to the method of the present invention described above, a flat pattern is formed on the upper surface of a flat plate to form a flat tool, and the flat tool is moved parallel to the upper surface of the roll while the roll is pressed against the flat tool. Since the convex pattern is formed on the roll, a fine convex pattern can be easily formed on the roll surface. Further, the cylindrical roll is composed of an outer skin portion and a core portion, the outer skin portion is softer than a flat tool, the core portion has higher strength than the outer skin portion, and after forming a convex pattern on the roll surface, the outer skin portion Since the hardness is increased, it is easy to form a convex pattern on the roll surface, but the bearing portion and the roll surface can withstand a large rolling force during coining roll processing.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram schematically showing a method for processing a coining roll of the present invention. In this figure, (A) shows fabrication of a flat tool and a roll, (B) shows formation of a convex pattern on the roll surface, (C) shows vacuum hardening of the roll, and (D) shows coining roll processing.

First, in the method of the present invention, as shown in FIG. 1 (A), a flat tool 1 in which a concave pattern is formed on the upper surface of a flat plate
To produce. In this processing, since the material to be processed is a flat plate and the processed shape is a concave shape, it can be easily processed by a conventionally known processing method. For example, etching processing, laser processing, cutting processing, electric discharge processing or the like can be applied. The flat tool 1 is preferably made of a material having a sufficiently high hardness, for example, a cemented carbide.

In parallel, a cylindrical roll 3 having bearings 2 at both ends is prepared. As shown in FIG. 2, this roll 3 comprises a hollow cylindrical outer skin portion 4 having a convex pattern formed on the surface, and a core portion 5 axially penetrating the outer skin portion 4 and having bearing portions 2 at both ends. . The core portion 5 may be a cylindrical member having the same diameter as a whole, or the diameter of the portion penetrating the outer skin portion 4 may be increased as shown in the drawing. Further, the outer skin portion 4 and the core portion 5 are firmly connected to each other by a suitable means such as interference fitting, shrink fitting, brazing, diffusion bonding, or the like.

The outer skin portion 4 is softer than the flat tool 1, and the core portion 5 has a higher strength than the outer skin portion 4. For example, a tool steel in which the core portion 5 is hardened and the outer skin portion 4 is annealed is preferable. When a soft material such as aluminum is subjected to coining roll processing, the core portion 5 may be hardened tool steel and the outer skin portion 4 may be unhardened duralumin. With this configuration, it is easy to form a convex pattern on the roll surface, and the bearing portion and the roll surface can withstand a large rolling force during coining roll processing.

The outer skin portion 4 has a crown (not shown) on the surface of which the central portion bulges outward slightly. This crown is set to a size suitable for forming a convex pattern on the roll surface and then subjecting a flat plate to coining roll processing. With such a structure, when the coining roll according to the present invention is used for the coining roll processing, a flat plate having a large area can be pressed down with a substantially uniform surface pressure.

According to the method of the present invention, as shown in FIG. 1B, the flat tool 1 is supported so as to be movable in parallel with respect to the upper surface thereof, and the roll 3 is fixed to the upper surface of the flat tool 1. And supports the bearing portion 2 so as to be vertically movable. For supporting the flat tool 1, it is preferable to horizontally support the flat tool 1 via a linear guide in the shape of a horizontal plate. Further, for supporting the roll 3, the bearing 2 is supported by an appropriate bearing 6 so as to be vertically movable, and the bearing 6 can be downwardly lowered by a hydraulic cylinder 7 or the like. Next, while the roll 3 is being pressed against the flat tool 1, the flat tool 1 is moved in parallel with respect to its upper surface (pulling out), thereby forming a convex pattern on the roll surface. By such a method, a fine convex pattern can be easily formed on the roll surface.

In FIG. 1 (B), the rolling-down force when forming the convex pattern on the roll surface is larger than the rolling-down force when the flat plate is actually coined. Therefore, at this time, a convex pattern is formed on the roll surface, and the crown on the roll surface is also reduced by the rolling force. However, this crown, after forming a convex pattern on the roll surface, as described above,
Since the size of the flat plate is set to be suitable for the coining roll processing, when the coining roll is processed by using the coining roll according to the present invention, it is possible to reduce a flat plate having a wide area with a substantially uniform surface pressure. . Further, since the rolling force when forming the convex pattern on the roll surface is larger than the rolling force when the flat plate is actually coined, a large bending force also acts on the roll itself. Is composed of the outer skin portion 4 and the core portion 5, and since the core portion 5 having a higher strength than the outer skin portion 4 is used, even if the outer skin portion 4 is softer than the flat tool 1, a high load and Can withstand surface pressure.

Then, as shown in FIG. 1C, the roll 3 having a convex pattern formed on the surface is subjected to heat treatment such as vacuum quenching in a vacuum furnace 8 to increase the hardness of the outer skin portion 4.
This makes it possible to obtain the hardness of the roll surface required when performing the coining roll processing using the coining roll 3 according to the present invention. As shown in FIG. 1D, the completed coining roll 3 can be used to roll down the flat plate 9 by pressing the flat plate 9 with the coining roll 3.

FIG. 3 is a copy of a scanning electron micrograph of the surface of the flat tool (A) used in the method of the present invention and the coining roll (B) obtained by this method, which is horizontal in the figure. The line segment shows a length of 100 μm. Figure 3
In (A), the outside of the large circle a is the flat top surface b of the flat tool, the inside of the large circle a is the recess, the inside of the small circle c is the bottom of the recess, and a substantially flat bottom is formed. ing. From this figure, the diameter is about 200 μm and the depth is 50 μm.
It can be seen that the microscopic depressions (recesses) are formed on the surface of the flat tool. Also, in FIG. 3B, the outside of the large circle a is the cylindrical outer surface b of the roll, the inside of the large circle a is the convex portion, and the inside of the small circle c is the top of the convex portion, and Although the filling is insufficient, a convex portion having a shape close to a replica of the concave portion formed on the flat tool (A) is formed.

As mentioned above, according to the method of the present invention,
The following effects can be obtained. Since the roll having the fine surface shape is manufactured by plastic working, the processing can be easily repeated and the transfer of the fine surface shape can be performed with high accuracy. This is a processing method that combines drawing and a roll that can rotate freely. The equipment is small, and delicate operation control is easy. Since a flat tool is used as a prototype, it is easier than performing fine processing directly on the roll. Further, by repeatedly using the plane tool for one roll, it is possible to reduce the area for processing the fine surface shape at the same time. By using the roll shown in FIG. 2 (composite roll), even if a load required for plastic deformation of the roll surface is applied, the bearing portion does not undergo plastic deformation, so that the load can be endured. Further, by applying a crown to the cylindrical portion of the composite roll, machining in the axial direction is made uniform.

Therefore, according to the method of the present invention, it is possible to repeatedly use a cemented carbide flat tool having a fine surface shape by ion beam etching or the like, and to use tool steel or other materials in a soft state (annealed state). Cylinder rolls and composite rolls that combine a higher strength core material are coined, and after strengthening the ring-shaped part by heat treatment, etc., the final coining using the composite rolls (rolling, driven rolling, etc.) It is possible to efficiently give a predetermined fine surface shape to a plate material or the like.

[0020]

As described above, according to the method for processing a coining roll of the present invention, a fine convex pattern can be easily formed on the roll surface, and the bearing portion and the roll surface can withstand a large rolling force. Has the excellent effect of.

[Brief description of drawings]

FIG. 1 is a flow chart schematically showing a method for processing a coining roll of the present invention.

FIG. 2 is an overall perspective view of a roll used in the present invention.

FIG. 3 is a reproduction of a scanning electron micrograph of the surface of the flat tool (A) used in the method of the present invention and the coining roll (B) obtained by this method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flat tool 2 Bearing part 3 Roll 4 Skin part 5 Core part 6 Bearing 7 Hydraulic cylinder 8 Vacuum furnace 9 Flat plate

Claims (3)

[Claims] 1. A flat tool comprising a flat tool having an indented pattern formed on the upper surface of a flat plate, and a cylindrical roll having bearing portions at both ends, wherein the flat tool is supported so as to be movable in parallel to the upper surface, and the roll is flat. To support the bearing so that it can move vertically with respect to the upper surface of the tool, and to move the flat tool parallel to the upper surface while rolling the roll against the flat tool, thereby forming a convex pattern on the roll surface. A method for processing a coining roll, characterized by: 2. The cylindrical roll comprises a hollow cylindrical outer skin portion having a convex pattern formed on the surface thereof, and a core portion axially penetrating the outer skin portion and having bearing portions at both ends, the outer skin portion being a flat surface. Softer than the tool, the core has a higher strength than the outer skin, and after forming a convex pattern on the roll surface,
The method for processing a coining roll according to claim 1, wherein the hardness of the outer skin portion is increased. 3. The outer skin portion has a crown whose center portion bulges outward slightly on the surface thereof. The crown is used for forming a convex pattern on the surface of the roll and thereafter for flattening a flat plate. The method for processing a coining roll according to claim 2, wherein the size is suitable.