JP2003001327A - Press device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a press device capable of bending a steel plate in stepped shape while preventing generation of defects and warps on the surface of the steel plate for processing. SOLUTION: A mildly declining buffering surface 8c is formed between a processing surface 8a and a side surface 8b of a fixed die. When a crease pressing member 5 presses a steel plate 30 for processing on a press-sustaining surface 8a of the fixed die 8 and a pressing surface 4a of a punch 4 presses the steel plate on a processing surface 8b, the undersurface of the plate 30 is sustained by the buffering surface 8c.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press device for bending a sheet metal, and more particularly to a structure for preventing bending of a warp and a shock line and performing bending with high accuracy.

[0002]

2. Description of the Related Art A conventional press machine for bending a sheet metal into a stepped shape is, for example, as shown in FIG. 4, an upper die 3 and a punch 4 mounted on the lower surface of the upper die 3 and having a pressing surface 4a formed thereon.
And a wrinkle retainer 5 supported on one side of the punch 4 by a spring 6 so that the upper die can be slid up and down,
The lower die 7 and the fixed die 31 mounted on the upper surface of the lower die 7 and having the processing surface 31a formed therein constitute a lower die.

When the sheet metal 30 for processing is placed on the fixed die 31, the upper die is lowered, and the wrinkle retainer 5 of the upper die presses the sheet metal 30 against the fixed die 31. Subsequently, the pressing surface 4a of the punch 4 presses the sheet metal 30 against the processing surface 31a of the fixed die 31, whereby the sheet metal 30 is processed into a step shape.

However, the punch 4 is replaced by the sheet metal 3
When 0 is pressed against the fixed die 31, the sheet metal 30 comes into contact with the side edge of the processed surface 31a shown in the A portion, and a scratch called a so-called shock line is generated on the surface of the contacted portion, or a contact is generated. There is a problem that when the upper die is lifted by the stress applied to the formed portion and the sheet metal 30 is opened, warpage occurs at the edge of the sheet metal 30, and a press that can be processed as an external component or a highly accurate component A device was needed.

[0005]

In view of the above problems, the present invention prevents the occurrence of a shock line or warp,
It is an object of the present invention to provide a press device that can perform processing.

[0006]

In order to solve the above-mentioned problems, the present invention provides an upper die, a punch mounted on the lower surface of the upper die and having a pressing surface formed thereon, and vertically movable by a spring on one side of the punch. An upper die including a wrinkle retainer supported to form a pressure contact surface, a lower die, a pressure receiving surface attached to the upper surface of the lower die and corresponding to the pressure contact surface, and a processing surface corresponding to the pressing surface of the punch. Is composed of a lower die and a fixed die formed on the upper surface, the sheet metal for processing placed on the fixed die is pressed against the pressure receiving surface with the pressure contact surface, and the processing surface with the pressing surface. By pressing, in a pressing device that forms the sheet metal into a step shape, the processing surface of the fixed die and the side surface of the fixed die that is continuous with the processing surface are gently inclined, and the sheet metal is When pressed against the pressing surface of the sheet metal It has a structure in which a cushioning surface for receiving the surface.

Further, the buffer surface and the processed surface are connected by a curved surface.

Further, a chamfered portion is provided between the buffer surface and a side surface of the fixed die connected to the buffer surface.

Further, the insert having the cushioning surface can be inserted into and removed from the fixed die.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail as examples based on the accompanying drawings. Figure 1 (
FIG. 1A is an external view showing the entire press machine.
(B) is sectional drawing which shows the sheet metal for processing before processing and after processing. FIG. 2 is a cross-sectional view showing a sheet metal working process.
FIG. 6 is a cross-sectional view showing another embodiment. The pressing apparatus according to the present invention, as shown in FIG.
And an upper die 1 attached to the lower stage 40b, and the upper die 1 is fixed to a ram vertically supported by the upper stage 40a. In the processing sheet metal 30 placed on the lower die 2, the upper die 1 mounted on the ram descends from the upper stage 40a and is pressed by the lower die 2 at a predetermined pressure or more. As a result, as shown in FIG. 1B, the plate shape before processing is bent so as to have a step shape after processing.

As shown in FIG. 2A, the upper die 1
Is the same as the upper die 3 formed in a rectangular shape, the punch 4 mounted on the lower surface of the upper die 3 and having the curved pressing surface 4a for processing the sheet metal 30 into a predetermined step shape, The punch 4 is supported by one side of the punch 4 so as to be vertically movable, and is composed of a wrinkle retainer 5 having a pressure contact surface 5 for pressing the sheet metal 30 on the lower surface. The lower die 2 is formed in a rectangular shape. Lower die 7 and a pressure receiving surface 8a mounted on the lower die 7 and corresponding to the pressure contact surface 5a of the wrinkle retainer 5 on the upper surface.
And, a processing surface 8b formed in a curved shape is provided corresponding to the pressing surface 4a of the punch 4.

A buffer surface 8c is formed between the processing surface 8b and the side surface 8d of the fixed die 8 and is gently inclined toward the side surface 8d. When pressed by the pressing surface 4a and bent, the lower surface of the sheet metal is received.

Next, the operation of the press device having the above structure will be described. When the sheet metal 30 for processing is placed on the fixed die 8, the upper die 1 is lowered, and the pressure contact surface 5a of the wrinkle retainer 5 moves the sheet metal 30 to the fixed die 8
And is pressed against and fixed to the pressure receiving surface 8a. Then, the punch 4 descends and the pressing surface 4a presses the sheet metal 30 to bend it. At this time, as shown in part A of FIG. 2 (B), the buffer surface 8c provided on the fixed die 8 widely receives the lower surface of the bent sheet metal 30 and is attached to the surface of the sheet metal 30. It is designed to prevent damage such as shock lines.

The punch 4 descends to the bottom dead center, as shown in FIG.
As shown in (C), when the pressing surface 4 a presses the sheet metal 30 against the processing surface 8 b of the fixed die 8, a step shape is formed on the sheet metal 30. Then, as shown in FIG. 2 (D), the upper die 1 is raised, and the sheet metal 30 having the step shape is opened.

When the sheet metal 30 is bent by being pressed by the pressing surface 4a of the punch 4, the buffer surface 8c receives the sheet metal 30 so that stress is not applied,
Even if the upper die 1 is lifted and the sheet metal 30 is opened, warpage or distortion due to residual stress is prevented.

Next, another embodiment will be described. Figure 3
The example shown in (A) is the processed surface 8b of the fixed die 8.
A curved surface 8e is provided between the sheet metal 3 and the buffer surface 8c, and when the sheet metal 30 is pressed by the pressing surface 4a, the sheet metal 3
The lower surface of 0 smoothly contacts the buffer surface 8c. Further, the example shown in FIG. 3 (B) is the buffer surface 8c.
A chamfered portion 8f is provided by chamfering a corner portion between the side surface 8d and the side surface 8d so that fine scratches are not generated on the surface of the sheet metal 30 as much as possible. In addition, the example shown in FIG.
In addition, the insert 10 having the cushioning surface 10a can be inserted and removed so that it can be appropriately replaced with a nest having the cushioning surface 10a formed at an optimum inclination angle when the sheet metal 30 is bent. .

[0017]

As described above, according to the present invention,
By providing a gently sloping cushioning surface between the processing surface and the side surface of the fixed die, it is possible to prevent the occurrence of so-called shock lines on the surface of the processing sheet metal, and to prevent warpage and distortion. It is possible to prevent the press device with improved processing accuracy.

[Brief description of drawings]

FIG. 1A is an external view of the entire press device. (B) is sectional drawing which shows the state of the sheet metal for processing before and after processing.

FIG. 2 is a cross-sectional view showing a processing step of a pressing device according to the present invention.

3A to 3C are cross-sectional views showing another embodiment.

FIG. 4 is a cross-sectional view showing a processing step of a pressing device according to a conventional example.

[Explanation of symbols]

1 Upper die 2 Lower die 3 Upper mold 4 punch 4a Pressing surface 5 Wrinkle retainer 5a Pressure contact surface 5b slide hole 6 spring 7 Lower mold 8 fixed die 8a Pressure receiving surface 8b Processing surface 8c Buffer surface 8d side 8e curved surface 8f chamfer 9 Fixed die 10 nesting 10a Buffer surface

Claims (4)

[Claims] 1. An upper die comprising an upper die, a punch attached to a lower surface of the same die to form a pressing surface, and a wrinkle retainer which is supported on one side of the punch by a spring so as to be vertically movable and to form a pressure contact surface. A lower die including a die, a lower die, a fixed die having an upper surface having a pressure receiving surface which is mounted on the upper surface of the lower die and corresponds to the pressure contact surface, and a processing surface which corresponds to the pressing surface of the punch. And pressing the sheet metal for processing placed on the fixed die to the pressure receiving surface with the pressure contact surface and pressing the processing surface with the pressing surface to form the sheet metal into a step shape. In the pressing device, the processing surface of the fixed die and the side surface of the fixed die connected to the processing surface are gently inclined, and when the sheet metal is pressed by the pressing surface, the lower surface of the sheet metal is Characterized by providing a buffer surface for receiving Less equipment. 2. The press device according to claim 1, wherein the buffer surface and the processing surface are connected by a curved surface. 3. The press device according to claim 1, wherein a chamfered portion is provided between the cushioning surface and a side surface of the fixed die connected to the cushioning surface. 4. The press device according to claim 1, wherein the insert having the cushioning surface can be inserted into and removed from the fixed die.