JP2000280034A - Punch molding method of work and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform molding of a highly accurate convex part at the time of work punch molding for molding a convex part and a concave part corresponding each other on both sides of the work by restricting concentration of an excess metal to a base end peripheral part of the convex part. SOLUTION: When a metallic plate material X is mounted on a die 4 and is clamped, a tensile stress is given to the plate material X in a state that a counter punch 5 is pushing up from downward of the plate X. Next, while a concave part W2 is press molded to the plate X, to which a tensile stress is given, by a mold convex part 9 (8) of the molding punch 7, a convex part W1 is press molded by a mold concave part 10 of the counter punch 5. Then, a punching position of the plate X, on which the concave part w2 and the convex part Ω1 are molded, is pushed down by the molding punch 7 for punch molding the work W.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for punching and forming a workpiece formed by punching a workpiece having a predetermined shape from a metal plate.

[0002]

2. Description of the Related Art Conventionally, when a workpiece of a predetermined shape having a convex portion on one side surface and a concave portion corresponding to the convex portion on the other side surface is punched from a metal plate material, first, as shown in FIG.
The plate 12 is clamped by the pad 12 of the upper die 11 being pressed against the die 14 of the lower die 13 via the plate X. A forming punch 15 for punching the plate material X into a work shape is provided above the punching position of the plate material X,
Below the forming punch 15, a counter punch 16 that can be lowered is provided. A pressing pin 1 for forming the concave portion W ₂ of the work is provided on the forming punch 15.
7 protrudes below the forming punch 15. The counter punch 16 has a molding recess 18 for molding the projection W _{1 of the} work corresponding to the pressing pin 17.
Are formed.

Then, as shown in FIG. 4B, the forming punch 15 descends. When the forming punch 15 is lowered, the pressing pin 17 is pushed into the plate material X and the concave portion W _{2 is formed.}
Is formed, and at the same time, the forming recess 1 of the counter punch 16 is formed.
Protrusions W ₁ is formed by 8.

[0004] Thereafter, as shown in FIG. 4 (c), the forming punch 15 is further lowered, the plate material X is punched out, and a work W having a predetermined shape is formed.

However, according to the above-described punching, the pressing pin 17 starts to form the recess W ₂ prior to the punching of the forming punch 15 as shown in FIG. The flesh flows toward the periphery of the molding recess 18, and the excess flesh is concentrated on the base peripheral edge Y of the projection W ₁ . If punching is performed in this state, the excess thickness concentrated on the base end peripheral portion Y of the convex portion W ₁ cannot be crushed to a predetermined thickness, and the accurate convex portion W corresponding to the forming concave portion 18 of the counter punch 16 cannot be crushed. There was an inconvenience that molding of ₁ was not performed.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances and has been achieved by the present invention. It is an object of the present invention to provide a method and an apparatus for punching and forming a work capable of forming a high-precision convex portion while suppressing the concentration of excess thickness on the portion.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, according to the present invention, a workpiece having a predetermined shape having a convex portion on one side and a concave portion corresponding to the convex portion on the other side is punched from a metal plate material. In the method of punching and forming a workpiece to be formed, the plate material is placed on a die and clamped, and a punching position of the plate material clamped by a vertically movable counter punch is pushed up from below the plate material. A step of applying a tensile stress to the plate material by means of, and a forming punch movable up and down in accordance with a punching position of the plate material is provided at a predetermined position of the plate material to which a tensile stress is applied by a forming protrusion provided on the forming punch. Press-molding the concave portion and press-molding the convex portion with a molded concave portion provided in the counter punch corresponding to the molded convex portion; and forming the concave portion and the convex portion. The forming punch corresponds to the punching position of the timber is characterized in that it comprises a step of punching the workpiece pushes down the leaf material.

According to the method of the present invention, first, the plate material placed on the die is clamped while the punching position of the plate material is pushed up from below by the counter punch. Thereby, a tensile stress is applied to the punching position of the plate material.

[0009] At this time, specifically, a tensile stress is applied to the plate material by clamping the plate material on the die while maintaining the state where the counter punch protrudes upward from the die. be able to. Alternatively, after the plate is placed on a die and clamped, the counter punch protrudes upward from the die and pushes up the plate from below, whereby tensile stress is applied to the plate. Can be granted.

Next, the forming punch is lowered, and the forming convex portion of the forming punch and the forming concave portion of the counter punch are pressed from above and below via a plate material to which tensile stress is applied, and tensile stress is applied. A convex portion and a concave portion are pressed at predetermined positions of the plate material.

As described above, by applying the tensile stress to the punching position of the plate material, the flow of the meat at the punching position of the plate material can be dispersed in advance, and the work of the workpiece is pressed by the press contact between the forming convex portion and the forming concave portion. When the convex portion and the concave portion are formed, it is possible to suppress the excess thickness from being concentrated on the base end peripheral portion of the convex portion. Accordingly, the convex portion along the molded concave portion can be formed with high accuracy by pressing the molded convex portion and the molded concave portion. Then, the punching position of the plate material is punched by pressing down the forming punch, and a work having a predetermined shape is formed.

The present invention also relates to an apparatus for punching and forming a workpiece of a predetermined shape, which is formed by punching a workpiece having a predetermined shape having a convex portion on one side surface and a concave portion corresponding to the convex portion on another side surface from a metal plate material. A die, a pad for clamping the plate material placed on the die, a forming punch for pressing down a punching position of the plate material placed on the die to punch into a predetermined work shape, and a forming punch. Prior to punching by the forming punch, the punching position of the plate material clamped on the die by the pad is pushed up from below the plate material so as to be pulled up from the lower side of the plate material. A cow that applies a stress and descends in a state of being pressed against the work following the pressing of the work by the forming punch during punching by the forming punch. And a forming punch which presses and forms a concave portion of the work, and wherein the counter punch presses the forming protrusion of the forming punch by pressing against the work at the time of punching by the forming punch. Accordingly, a forming recess forming the protrusion of the work is provided at a position facing the forming protrusion of the forming punch.

[0013] According to the apparatus of the present invention, the plate material placed on the die is clamped by the pad. At this time, since the counter punch pushes up the punching position of the plate in the direction opposite to the pressing direction in which the pad clamps the plate on the die, a tensile stress is applied to the punching position of the plate.

The counter punch, which pushes up the punching position of the plate material, is formed with the forming recess, and the pressing protrusion of the forming punch causes the forming protrusion of the forming punch to be recessed into the plate material corresponding to the forming recess. I do. At this time, the concave portion and the convex portion are pressed and formed on the plate member to which the tensile stress is applied. Since a tensile stress is applied to the plate material, when the forming concave portion of the counter punch forms a convex portion on the plate material with the pressing of the forming convex portion of the forming punch, the meat flow of the plate material is dispersed and the convex portion is formed. Concentration of excess thickness on the base end peripheral portion of the portion is suppressed. Thereby, the base end peripheral edge of the convex portion can be sufficiently crushed, and a highly accurate convex portion can be formed.

[0015] Then, the forming punch presses down the plate material while maintaining the pressed state of the plate material together with the counter punch,
The work can be punched into a predetermined shape.

In the present invention, it is preferable that the counter punch is formed so as to gradually protrude from a side edge thereof to a portion where the forming concave portion is provided. Thereby, when the counter punch is protruded from the die, the clamped plate material can be deformed so as to bulge toward a position corresponding to the molding concave portion, and can correspond to the molding concave portion forming the concave portion. A relatively large tensile stress can be generated at the position where the stress occurs. As a result, when the convex portion is molded by the molded concave portion, it is possible to reliably suppress the concentration of excess thickness on the base end peripheral portion of the convex portion.

In this case, it is preferable that the forming punch is formed in a shape corresponding to the counter punch from a side edge to a portion where the forming protrusion is provided. Thereby, the forming punch can be brought into close contact with the entire punching position of the plate material deformed so as to be expanded by the application of the tensile stress, and the punching can be performed while maintaining the thickness of the work uniformly. .

[0018]

An embodiment of the present invention will be described with reference to the drawings. 1 (a) to 1 (d) show a schematic configuration of a work punching and forming apparatus of the present embodiment, and are explanatory diagrams showing a work punching and forming process by the apparatus, and FIGS.
(A) and (c) are explanatory views showing a part of a punching and forming step of a work in another embodiment, and FIG. 3 is an explanatory view showing another form of a forming punch.

The work W in this embodiment is shown in FIG.
By punching a metal plate material X shown in FIG.
As shown in cross section in (d), one side (lower side in the figure)
Convex part W ₁Is formed, and the concave portion W is formed on the other side surface (the upper surface side in the drawing).
_TwoIs formed. Work with this type of shape
For example, although not shown, a continuously variable
The elements that make up the V-belt used in the speed mechanism
I can do it. In the case of this type of V belt, a plurality of
The elements are superimposed and superimposed on each other.
When the projection W₁Is concave of another element adjacent to
Department W_TwoAnd mutual positioning is performed. others
, Convex part W₁Is concave W_TwoHigh to ensure tight engagement
Accurate convex part W₁Need to be molded.

Therefore, the punch forming apparatus 1 of the present embodiment
Has the following configuration. That is, as shown in FIG. 1A, the punch forming apparatus 1 includes a lower mold 2 located below a metal plate X serving as a material, and an upper mold located above the lower mold 2 via the plate X. And a mold 3. The lower die 2 includes a die 4 and a counter punch 5, and the upper die 3 includes a pad 6 and a forming punch 7.

The pad 6 is provided so as to be able to move up and down, and is lowered by driving up and down driving means (not shown) when clamping the plate material X on the die 4. The forming punch 7 has a shape corresponding to the punching shape of the plate material X, and is provided separately from the pad 6 so as to be vertically movable. The forming punch 7 comes into contact with a punching position of the plate material X clamped on the die 4 by the pad 6, is further lowered, and presses the plate material X downward to the die 4, thereby punching the work W. Molding.

A pressing pin 8 is provided on the forming punch 7 so as to be slidable in the vertical direction. The pressing pin 8 is opposed to the position where the concave portion W _{2 of the} work W is formed, and the tapered end portion 9 (the lower end in the figure) is maintained in a protruding state as a forming convex portion. The forming punch 7
It is lowered with.

The counter punch 5 includes a forming punch 7
The die 4 is urged upwardly by urging means (not shown) and is held by the lower mold 2 so that the upper portion protrudes from the upper surface of the die 4. The upper part of the counter punch 5 is formed in a substantially arc shape, and the work W is positioned at a position facing the pressing pin 8 of the forming punch 7 at the upper part.
Molding recess 10 is formed for forming the convex portion W _1.

The counter punch 5 has an urging force capable of deforming the plate X into a curved shape when the plate X clamped by the pad 6 comes into contact with an upper portion of the counter punch 5 as described later. And protrudes from the upper surface of the die 4. On the other hand, the forming punch 7
The counter punch 5 descends with a pressing force larger than the urging force directed upward. Thus, when the forming punch 7 punches out the sheet material X, the counter punch 5 descends following the lowering of the forming punch 7 in a state where the counter punch 5 is pressed from below the sheet material X.

Next, a description will be given of the stamping and forming process by the apparatus 1 having the above-described configuration. First, as shown in FIG.
A plate material X is interposed between the upper mold 3 and the lower mold 2, and FIG.
As shown in (1), the plate 6 is clamped by lowering the pad 6 and pressing a portion of the plate X except for the punching position against the upper surface of the die 4.

At this time, the upper portion of the counter punch 5 protrudes from the upper surface of the die 4, and the punching position of the plate material X is pushed up by the upper portion of the counter punch 5 with the clamping of the plate material X by the pad 6. As described above, even if the plate material X is pushed down by the pad 6, the counter punch 5 has an urging force capable of resisting the downward movement of the plate material X. Therefore, the plate material X is deformed so as to bulge upward. Due to the deformation, a tensile stress is generated at the punched position of the plate material X. Next, FIG.
As shown in the figure, the forming punch 7 descends, and the pressing pin 8 provided in the forming punch 7 presses into the upper surface of the plate material X to which the tensile stress is applied. The counter punch 5 is in contact with the lower surface of the plate material X.
The plate material X penetrates into the molding concave portion 10 of FIG. Thus, the recess W ₂ and the convex portion W ₁ are molded plate X. At this time, due to the tensile stress applied to the plate material X, the meat flow of the plate material X accompanying the press forming by the pressing pins 8 is dispersed in the left and right direction in the figure, and the convex portion W ₁ formed by the forming concave portion 10.
The concentration of meat on the base peripheral portion Y is suppressed. Thus, accurately Totsubu W ₁ is molded along the molding recess 10.

Then, as shown in FIG. 1D, the forming punch 7 is further lowered to push down the punching position of the plate material X. The counter punch 5 descends while being pressed against the plate material X following the pressing down of the forming punch 7, whereby a work W of a predetermined shape is punched and formed. The pressing pin 8 further protrudes (falls) at the same time as the work W is punched and formed, and slightly presses the concave portion W _2.
The amount of press-in is increased, and the punched work W is moved to the edge.

In this embodiment, FIG.
As shown in FIG.
As shown in FIG. 1 (b), the plate material X is pushed up to apply a tensile stress to the plate material X by projecting from the upper surface of the substrate X and lowering the pad 6, but the present invention is not limited to this. Absent. Another example is shown in FIG.
As shown in FIG. 2A, the upper part of the counter punch 5 is retracted below the upper surface of the die 4, and then, as shown in FIG. As shown in FIG. 2C, the upper part of the counter punch 5 is projected from the upper surface of the die 4. By doing so, a tensile stress is applied to the plate X while being pushed up from below.

In the above-described embodiment, FIG.
As shown in (a) to (d), the forming punch 7 includes the pressing pin 8, but the forming punch of the present invention is not limited to this configuration. the molding protrusions corresponding to the recesses W ₂ shape of the workpiece W to the lower end may be provided integrally.

In the above-described embodiment, FIG.
As shown in FIG. 4A, a forming punch 7 having a flat lower end face facing the counter punch 5 is employed. In addition, as shown in FIG. A forming punch 7 ′ having a lower end surface having a curved surface may be employed according to the shape. According to this, punching can be performed in a state where the work W is in close contact between the counter punch 5 and the forming punch 7 ′ at the time of punching, so that the flow of meat to the edge of the work W is suppressed. Thus, the thickness of the work W can be made uniform and the molding accuracy can be further improved.

[Brief description of the drawings]

FIG. 1 is an explanatory view schematically showing a configuration of a work punching and forming apparatus according to an embodiment of the present invention, and showing a work punching and forming step by the apparatus.

FIG. 2 is an explanatory view showing a part of a punch forming process of a work according to another embodiment.

FIG. 3 is an explanatory view showing another embodiment of a forming punch.

FIG. 4 is an explanatory view showing a conventional work of punching and forming a work.

[Explanation of symbols]

W: Work, W ₁ : Convex, W ₂ : Concave, X: Metal plate, 4: Die, 5: Counter punch, 6: Pad, 7
... forming punch, 8 ... pressing pin (forming protrusion), 10 ... forming recess.

Claims (6)

[Claims] 1. A method for punching and forming a work of a predetermined shape having a convex portion on one side surface and a concave portion corresponding to the convex portion on the other side surface by punching the work from a metal plate, wherein the plate is placed on a die. A step of applying a tensile stress to the plate material by placing the plate material on a clamped position and pressing a punching position of the plate material clamped by the vertically movable counter punch from below the plate material; and punching the plate material. A forming punch movable up and down in accordance with the position press-molds the concave portion at a predetermined position of a plate material to which a tensile stress is applied by a forming convex portion provided in the forming punch, and the counter corresponding to the forming convex portion. A step of press-molding the convex portion with a molded concave portion provided in the punch; and the forming punch presses the plate material corresponding to a punching position of the plate material in which the concave portion and the convex portion are formed. Punching process of the workpiece, characterized in that lowering and and a step of punching the workpiece. 2. The step of applying a tensile stress to the plate material, wherein the counter punch is maintained above the die, and the plate material is clamped on the die so that a tensile stress is applied to the plate material. 2. The method according to claim 1, further comprising: 3. In the step of applying a tensile stress to the plate material, the plate material is placed on a die and clamped, and then the counter punch projects upward from the die and pushes up the plate material from below. 2. The method according to claim 1, wherein a tensile stress is applied to the plate material. 4. A workpiece punching and forming apparatus for punching a workpiece having a predetermined shape having a convex portion on one side surface and a concave portion corresponding to the convex portion on another side surface from a metal plate material, wherein the plate material is placed. A die; a pad for clamping the plate material placed on the die; a forming punch for pushing down a punching position of the plate material placed on the die to punch into a predetermined work shape; Prior to punching by the forming punch, the punching position of the plate material clamped on the die by the pad is set to a state where the punching position of the plate material is pushed up from below the plate material, thereby applying a tensile stress to the plate material. A counter punch which, when punched by the forming punch, descends in a state of being pressed against the work following the pressing of the work by the forming punch; The forming punch includes a forming convex portion that presses and forms a concave portion of the work, and the counter punch is configured to press the forming protrusion of the forming punch by pressing against the work at the time of punching by the forming punch. A punching and forming apparatus for a work, wherein a forming recess forming the protrusion of the work is provided at a position facing the forming protrusion of the forming punch. 5. The counter punch according to claim 4, wherein the counter punch is formed so as to gradually protrude from a side edge thereof to a portion where the molding concave portion is provided.
A punch forming apparatus for the described work. 6. A workpiece according to claim 5, wherein said forming punch is formed in a shape corresponding to said counter punch from a side edge thereof to a portion where said forming protrusion is provided. Punching equipment.