JP2007196283A - Method and device for adding wetting liquid onto metallic sheet for press working - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and a device for adding a wetting liquid by which the sticking of the metallic sheet to a die is prevented after press working, which requires a small quantity of the wetting liquid and by which the surroundings of the press are hardly soiled by the wetting liquid. <P>SOLUTION: An elastic body 8, impregnated with the wetting liquid, is installed in adjacent to a press die, which is composed of the first die with a die hole, and the second die which is brought into contact with and separated from the first die and has a punch pulled out and put into the die hole with contact and separation. A transferring means for transferring the metallic sheet 1 between the first die and the second die through the elastic body 8 is provided. The transferring means presses the pressing part of the surface in contact with the first die of the metallic sheet against the elastic body 8 when passing the metallic sheet through the elastic body 8. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for applying a wetting liquid to a metal plate for press work useful when performing punching press work, and a wetting liquid applying apparatus used therefor.

In press working using a fixed mold having a die hole and a moving mold having a punch, when a predetermined shape is punched from a metal plate, a burr protruding toward the fixed mold is generated at the periphery of the punched portion. . In particular, in the burring process in which the peripheral edge of the hole is intentionally bent, the protrusion height of the burr increases.
When the molded product is taken out from the mold after the press work is completed, the burr is caught on the inner periphery of the die hole, and the molded product is likely to stick to the fixed mold.
In addition, since a large frictional force is generated between the mold and the metal plate, the mold is deformed when the press work is repeated, causing a dimensional error of the molded product.

In order to prevent such a situation, a lubricant is generally interposed between the metal plate and the metal mold during press working.
As a method for applying a lubricant, conventionally, a method is known in which a lubricant is sprayed onto the surface of a mold from a nozzle that is inserted and removed between a pair of molds (see Patent Document 1).
However, in this method, the periphery of the press device is easily contaminated with the scattered lubricant, and there is a concern that an accident may occur in which an operator slips on his / her foot.
Further, if the press is repeated about 300 ± 50 times, the lubricant is lost from the mold, so that a new lubricant must be sprayed.

Further, a press working lubricant application device that discharges and applies granular press work lubricant in a predetermined pattern at a predetermined position of a press work material by dot matrix control is known (see Patent Document 2).
According to this apparatus, since the lubricating oil does not adhere to a range where the lubricating oil application is not required, there is an advantage that the amount of the lubricating oil used and the cleaning liquid for degreasing are small, and the load on the environment can be reduced.
However, since the lubricating oil is discharged and adhered to the surface of the workpiece, the amount of the lubricating oil to be used is not sufficient, and a complicated device is required for attaching the lubricating oil.

JP 2003-48034 A JP 2000-20098 A

  The problem to be solved by the present invention is that the metal plate can be prevented from sticking to the mold after press working, the life of the mold can be extended, the amount of wetting liquid used can be reduced, It is an object of the present invention to provide a method and an apparatus for applying a wetting liquid to a metal plate for press working that does not have a risk of being soiled by the wetting liquid.

The method for applying a wetting liquid to a metal plate for press working according to the present invention includes sandwiching the metal plate for press working between a first die having a die hole and a second die having a punch inserted into and removed from the die hole, In press working for inserting the punch into the die hole through the metal plate, before transferring the metal plate between the first die and the second die, the first die of the metal plate and The pressed part of the contact surface is pressed against the elastic body impregnated with the wetting liquid.
The wetting liquid is a conventionally used pressing oil or a mixed oil thereof.

An apparatus for applying a wetting liquid to a metal plate for press working according to the present invention has a first die having a die hole, and a punch that comes in contact with and separates from the first die and is inserted into and removed from the die hole as the contact is made. An elastic body impregnated with a wetting liquid is installed adjacent to a press mold comprising a second mold, and a metal for press working is provided between the first mold and the second mold via the elastic body. Transfer means for transferring the plate is provided, and the transfer means presses the pressed portion of the surface of the metal plate in contact with the first mold against the elastic body when passing through the elastic body.
A robot arm or the like is used as the transfer means.

  In this case, a support table for placing the metal plate on standby is installed adjacent to the press mold, and a through hole having a position, shape, and size corresponding to the press portion of the metal plate is provided in the support table. A container having a larger area than the through hole is attached below the through hole on the back surface of the support table, and an elastic body impregnated with a wetting liquid is stored in the container. The contact portion may protrude from the through hole to the surface of the support table.

According to the first and second aspects of the present invention, the lubricating liquid adheres to the surface of the metal plate for press working that contacts the first die, so that the metal plate adheres to the die hole of the first die after the press working. In addition, the life of the mold can be extended, and the lubricant does not adhere to the press part, so that it is difficult to adversely affect the quality of the product.
In addition, since the frequency of replenishing the lubricating liquid is very low compared to the case where the lubricating liquid is applied to the mold, the amount of the lubricating liquid used can be greatly reduced, and the lubricating liquid can be used around the press machine. There is no worry about getting dirty.

According to the third aspect of the present invention, the wet liquid can be adhered by pressing the pressed portion of the metal plate against the elastic body simply by positioning the metal plate on the support table.
Further, it is only necessary to install an elastic body impregnated with a lubricating liquid on the support table for temporarily waiting the metal plate, and a complicated and large-scale apparatus is not necessary.

Hereinafter, as an embodiment of the present invention, a method of applying a wetting liquid to a metal plate when pressing a motor mounting metal plate of a window regulator mounted on an automobile and a wetting liquid applying device used therefor are described with reference to the drawings. Will be described in detail.
As shown in FIG. 1, the metal plate 1 punched out in advance and stocked in the magazine 2 is taken out of the magazine 2 by a transfer means such as a robot, and then six press machines arranged linearly. 3 are sequentially transferred, and each press machine 3 performs a predetermined pressing process.
A support table 4 is installed adjacent to the upstream side of each press machine 3 in the metal plate transfer direction, and the metal plate 1 is temporarily placed on the support table 4 before being transferred to the press machine 3. It is supposed to wait.

Further, in the fifth press machine 3, eyelet baring is performed to form a plurality of mounting holes in the metal plate 1.
The fifth press machine 3 includes a first die having a die hole and a second die having a punch that comes into contact with and separates from the first die from above and is inserted into and removed from the die hole as the contact is made. Although a press die is provided, its structure is well known in the art and will not be described in particular.
In the fifth press 3, the metal plate 1 is sandwiched between the first die and the second die, and the punch is inserted into the die hole through the metal plate 1. A plurality of mounting holes are formed.

As shown in FIG. 3, the support table 4 (fifth support table 4) installed adjacent to the upstream side of the fifth press 3 has a press portion 5 (FIG. 2) of the metal plate 1. A through hole 6 having a corresponding position, size and shape is formed.
Further, a container 7 slightly larger than the through hole 6 is welded below the through hole 6 on the back surface of the support table 4. That is, the through hole 6 is closed from the back by the container 7.
Furthermore, an elastic body 8 such as a sponge impregnated with a wetting liquid is housed inside the container 7, and the upper center portion of the elastic body 8 projects through the through hole 6 to the surface of the support table 4.
As an example, the wetting liquid is a mixed oil obtained by mixing 70-80% space punch and 30-20% press working oil.

Therefore, when the transfer means is placed on the fifth support table 4 and the metal plate 1 is placed, the press portion 5 on the lower surface of the metal plate 1 is pressed against the elastic body 8, and this portion is impregnated with the elastic body 8. The dampening liquid that has been applied adheres. A small-diameter circular hole 9 is formed in the center of the press portion 5 in advance.
Next, when the transfer means transfers the metal plate to the fifth press 3 and installs the metal plate 1 on the first die and then lowers the second die, the punch of the metal plate 1 The press portion 5 is inserted into the die hole. As a result, the periphery of the circular hole 9 is pushed down by the punch, and the metal plate 1 is formed with an attachment hole whose peripheral edge is bent downward.
Next, the second mold is raised and separated from the first mold, and the metal plate 1 is taken out from the fifth press machine 3, but the wetting liquid adheres to the press portion 5 of the metal plate 1. Therefore, the bent portion of the peripheral edge of the mounting hole does not stick to the die hole of the first mold, and the metal plate 1 is easily peeled off from the first mold.

When the application of the wetting liquid to the metal plate 1 is repeated, the wetting liquid impregnated in the elastic body 8 decreases and the effect of suppressing biting on the first mold is lost, but biting on the first mold occurs. As a result of investigating the number of presses until the end, it was found that the metal plate 1 adhered to the first mold when the press work was performed 3340 times.
This is about 10 times the number of times of pressing when the wetting liquid is applied to the first mold and the number of presses is about 300 ± 50 times. Not only can the frequency of stopping be overwhelmingly reduced, but also the amount of wetting liquid used can be reduced.

In addition, this invention can be applied not only to the press processing with respect to the metal for motor attachment of a window regulator but to the punching press processing to a metal plate in general.
Further, the transfer means for transferring the metal plate can be changed to a conveyor or the like according to the structure of the press device, the shape of the metal plate, etc., and the wetting liquid used is suitable for the material of the metal plate.

The schematic plan view of the press apparatus which concerns on the Example of this invention. The top view of the metal plate for press work. Sectional drawing of a support table.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Metal plate 2 Magazine 3 Press 4 Support table 5 Press part 6 Through hole 7 Container 8 Elastic body 9 Circular hole

Claims (3)

  Press work in which a metal plate for pressing is sandwiched between a first die having a die hole and a second die having a punch inserted into and removed from the die hole, and the punch is inserted into the die hole through the metal plate. In this embodiment, before the metal plate is transferred between the first mold and the second mold, the pressed portion of the surface of the metal plate in contact with the first mold is made into an elastic body impregnated with a wetting liquid. A method of applying a wetting liquid to a metal plate for press working, characterized by pressing.   Wet adjacent to a press die comprising a first die having a die hole and a second die having a punch which comes in contact with and separates from the first die and is inserted into and removed from the die hole in accordance with the contact and separation. An elastic body impregnated with a liquid is installed, and a transfer means is provided for transferring the metal plate for press processing between the first mold and the second mold via the elastic body, An apparatus for applying a wetting liquid to a metal plate for press working, wherein a press portion of a surface of the metal plate that contacts the first mold is pressed against the elastic body when passing through a body. A support table is installed adjacent to the press mold, a through hole corresponding to a press portion of the metal plate is drilled in the support table, and the through hole is formed below the through hole on the back surface of the support table. 3. A container having a larger area is attached, an elastic body impregnated with a wetting liquid is accommodated in the container, and a metal plate contact portion of the elastic body protrudes from the surface of the support table through the through hole. A device for applying a wetting material to the described metal plate for press working.

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