JP2003126927A - Press working metal die, punch, die and press working method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve work efficiency without processing the need of a post treatment to remove a burr, by preventing occurrence of a burr around a rim of a punched hole in a sheet material in a press working such as an external shape blanking and a hole punching of the sheet material. SOLUTION: A press working metal die A is equipped with the punch 1 and the die 2. A pushing die 10 is formed to a top end of the punch 1. A center projection 14 is arranged in the center of the top end of the pushing die 10. In the boundary part between a shaft 11 in the middle of the punch 1 and the pushing die 10, a chamfer forming face 12 is arranged. The die 2 has a discharging hole 20 vertically through its whole length. The discharging hole 20 is comprised of a guiding part 201 in the upper side and a discharging part 202 in the lower side. Around a hole rim in a upper surface 21 side of the guiding part 201, a chamfer forming face 220 is arranged to form a chamfer around a hole rim in the die 2 side of the punched hole formed in the material to be worked.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press die, punch, die and press working method. More specifically, for example, in press working such as outline cutting and punching (drilling) of plate material, burr is not generated at the edge of the hole of the plate material, and post-treatment for removing burr is unnecessary. Regarding what you did.

[0002]

2. Description of the Related Art Pressing is a processing method for giving permanent deformation that cannot be restored to metal and other materials. Press processing includes separation processing (shearing, etc.), forming processing (bending,
Overhanging, drawing, etc.), joining processing (joint folding, caulking, etc.), compression processing (forging, etc.). Among them, the punching of the outer shape and the punching of the plate material are one of the most important press workings, which are included in the above-mentioned separation working, and are widely adopted in the working of products in various fields.

The outline of press working such as outer shape punching and hole punching of a plate material will be described below. The press die used for the press working is composed of a punch, which is a male die, and a die, which is a female die. The die is a block provided with a discharge hole that matches the cross section of a punched body (a product in the case of punching the outer shape and a waste material in the case of punching the hole).

When press working, a plate material which is a base material (working material) is positioned between the die and the punch, and the die and the punch are brought relatively close to each other to separate the plate material. The portion of the plate material that is pressed by the punch is sheared to form a body and moves to the discharge hole side of the die, and is completely separated from the plate material through the discharge hole. As a result, a hole is formed in the plate material. In the case of punching out the outer shape, the punched body side becomes the product as described above, and in the case of punching out, the plate material side having the punched hole becomes the product.

[0005]

However, there are the following problems in the press working such as the outer shape punching and the hole punching of the above-described conventional plate material. That is, burrs as shown in FIG. 4 occur at the die edge of the punched hole of the plate material. Since the burr also has a sharp tip, and it is dangerous if it is left as it is, it has been necessary to handle the plate material having the hole with caution. Especially in the case of punching a plate material as a product, it was necessary to remove burrs as a post-treatment. The work of removing this burr is extremely complicated work, and has been a bottleneck in improving the efficiency of the work for punching holes.

(Object of the Invention) An object of the present invention is to prevent burrs from occurring at the edge of the hole of the plate material in press working such as punching and punching of the plate material. The post-processing for removal is unnecessary, and the work of press work such as punching the outer shape and punching of the plate material is made efficient. Another object of the present invention is to provide a chamfered portion at the hole edge portion of the punched hole of the plate material to clean the appearance of the hole edge portion.

[0007]

[Means for Solving the Problems] The means of the present invention taken to achieve the above object are as follows. According to a first aspect of the present invention, there is provided a press die including a punch and a die for separation processing in a press working, wherein a hole edge portion on a press surface side of a discharge hole provided in the die is processed. A press die is characterized in that a die face for forming a chamfered portion is provided at a hole edge portion on a die side among punched holes formed in a material.

According to a second aspect of the present invention, there is provided a punch used for a press die for separation in press working, comprising:
Used for a press die, which is characterized in that a die face for forming a chamfered portion is provided on an outer peripheral surface of a punch at a hole edge portion on a punch side among punched holes formed in a work material. It's a punch.

According to a third aspect of the present invention, there is provided a die used for a press die for separation in press working, wherein, among discharge holes provided in the die, a hole edge portion on the press surface side is
A die for use in a press die, wherein a die face for forming a chamfered portion is provided at a hole edge portion on the die side among punched holes formed in a work material.

According to the fourth aspect of the present invention, the chamfered portion is formed by the die pressing surface at the hole edge portion on the die side among the punched holes formed in the workpiece by the separation processing in the press working. It is a characteristic press working method.

(Operation) The press die according to the present invention operates as follows. When performing press working, a plate material which is a base material is positioned between the die and the punch. Next, by moving the punch or the like, the die and the punch are brought relatively close to each other, the plate material is pressed from the front and back sides, and the plate material is separated.

Of the plate material, the portion pressed by the punch is
When sheared, it becomes a blank and moves to the discharge hole side of the die, and is completely separated from the plate material through the discharge hole. As a result, a hole is formed in the plate material.

Among the punched holes, the punch-side and die-side hole edge portions are provided on the die surface provided on the outer periphery of the punch and the discharge holes provided on the die on the press surface side hole edge portion. A chamfer is formed by each mold surface. This allows
The chamfered part formed by punching makes the appearance of the hole edge clean, and the chamfered part formed by die can clean the appearance of the hole edge and prevent burrs from occurring. In the case of punching out the outer shape, the punched body side becomes the product, and in the case of punching out the plate material side having the punched hole becomes the product.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in more detail based on the embodiments shown in the drawings. FIG. 1 is a front view explanatory view showing an embodiment of a press die according to the present invention. In addition,
In FIG. 1, for convenience of description, the plate material that is the material to be processed is represented by an imaginary line (two-dot chain line).

The press die A is used for separation in press working, and includes a punch 1 which is a male die and a die 2 which is a female die. The punch 1 and the die 2 are usually attached to a press machine, but illustration and description of the press machine are omitted here.

The punch 1 is a rod having a circular cross section, and is provided with an extrusion die portion 10 at its tip (lower end in the figure).
A conical center projection 14 is provided at the center of the tip surface of the extrusion die 10. A shaft portion 11 having a diameter slightly larger than that of the pressing die portion 10 is provided at an intermediate portion of the punch 1. A boundary portion between the pressing die portion 10 and the shaft portion 11 is a step portion, and a chamfered portion forming surface 12 which is a die surface inclined by 45 ° from the pressing die portion 10 is provided.

At the base end of the punch 1, there is a shaft 11
There is provided a mounting portion 13 connected to the. The mounting portion 13 has a diameter larger than that of the shaft portion 11, and the boundary side is narrowed toward the tip side. The punch 1 is attached to the press machine by fixing the attachment portion 13.

The die 2 is provided with a discharge hole 20 penetrating in the vertical direction at the center thereof. The upper side of the discharge hole 20 serves as a guide portion 201 provided slightly larger than the diameter of the pressing die portion 10 of the punch 1. Further, the lower side of the discharge hole 20 is a discharge portion 202 which is provided with a diameter larger than that of the guide portion 201.

The guide portion 201 of the discharge hole 20 has a hole edge portion on the upper surface (pressing surface) 21 side, and a hole edge portion on the die 2 side of a punch hole (described later) formed in the workpiece. A protrusion 22 is provided to form a catch. The outer peripheral surface of the protruding portion 22 is provided so as to be inclined at 45 ° with respect to the upper surface 21 over the entire circumference, and this surface serves as a chamfered portion forming surface 220 which is a mold surface. The chamfered portion forming surface 12 and the chamfered portion forming surface 2
In the present embodiment, 20 has an inclination angle of 45 °, but is not limited to this angle.

(Operation) FIG. 2 is an explanatory cross-sectional view of a state in which punching is performed by the press die shown in FIG. 1, and FIG. 3 is a cross-sectional view showing a punched hole portion of a product obtained by punching shown in FIG. FIG. The operation of the press die A according to the present embodiment will be described with reference to FIGS. 1 to 3 by taking a case of punching as an example.

When performing the press working, a plate material (metal plate or the like) 3 as a base material is positioned between a die 2 and a punch 1 attached to a press machine (not shown). The plate machine 3 is pressed from the upper surface side by operating the press machine and lowering the punch 1. The part of the plate material 3 that is pressed by the punch 1 is separated by shearing the boundary part, and becomes a punched body 33 that moves to the discharge hole 20 side of the die 2. Then, the punched body 33 is further pushed by the punch 1, and the discharge hole 2
It falls through 0 and is completely separated from the plate material 3. As a result, the hole 30 is formed in the plate member 3.

Among the punched holes 33, the hole edge portion on the die 2 side (lower side in FIG. 2) at the time of pressing is provided at the hole edge portion on the upper surface 21 side of the discharge hole 20 provided in the die 2. Some protrusion 2
The chamfered portion forming surface 220 of the second portion forms the chamfered portion 31, so that the appearance can be cleaned and burr can be prevented from occurring. In addition, of the punched holes 33, the punch 1 at the time of pressing
A chamfered portion 32 is formed by the chamfered portion forming surface 12 provided on the punch 1 at the hole edge portion on the side (upper side in FIG. 2), and the appearance is clean.

It should be noted that the terms and expressions used in the present specification are merely for the purpose of explanation and are not limiting, and the terms and expressions equivalent to the above terms and expressions are not excluded. The present invention is not limited to the illustrated embodiment, and various modifications can be made within the scope of the technical idea.

[0024]

According to the present invention, in the press working of a plate material or the like, the hole edge portions on the punch side and the die side of the punch holes are
The chamfered portion is formed by the die surface provided on the outer peripheral portion of the punch and the die surface provided at the hole edge portion on the press surface side of the discharge holes provided in the die. As a result, the chamfered part formed by the punch has a clean appearance at the hole edge,
The chamfer formed by the die can clean the appearance of the hole edge and prevent burrs from occurring. Also,
Post-processing for removing burrs is unnecessary, and press work such as punching the outer shape and punching of the plate material can be made efficient.

[Brief description of drawings]

FIG. 1 is a front view explanatory diagram showing an embodiment of a press die according to the present invention.

FIG. 2 is a cross-sectional explanatory view showing a state where holes are punched by the press die shown in FIG.

FIG. 3 is a cross-sectional explanatory view showing a punched hole portion of a product obtained by punching shown in FIG.

FIG. 4 is an explanatory sectional view showing a punched hole portion of a product obtained by punching using a conventional press die.

[Explanation of symbols]

A press die 1 punch 10 Extrusion die part 11 Shaft 12 Chamfer forming surface 13 Mounting part 14 Center protrusion Two dies 20 discharge hole 201 Guide 202 Ejector 21 upper surface 22 Projection 220 Surface with chamfer 3 plate materials 30 holes 31, 32 Chamfer 33 body

Claims (4)

[Claims] 1. A press die for separating processing in a press working, comprising a punch and a die, wherein discharge holes formed in a die are formed in a work piece at a hole edge portion on a press surface side. A press die, wherein a die face for forming a chamfered portion is provided at a hole edge portion on the die side among the punching holes. 2. A punch used in a press die for separation processing in press working, wherein a chamfered portion is provided on an outer peripheral surface of the punch at a hole edge portion on the punch side among punched holes formed in a work material. A punch used for a press die, which is provided with a die surface for forming. 3. A die used for a press die for separation in press working, wherein a punch formed in a workpiece at a hole edge portion on a press surface side of discharge holes provided in the die. A die used for a press die, characterized in that a die face for forming a chamfered portion is provided at an edge portion of the hole on the die side. 4. A press working method, wherein a chamfered portion is formed by a press surface of the die at a hole edge portion on the die side among punched holes formed in a work material by separation processing in the press working. .