JPH02299728A - Pressing apparatus - Google Patents

Abstract

PURPOSE:To use the positioning hole in common with the positioning hole in a succeeding process by setting a nest pin with an elastic body so as to make it slidable in the deforming direction of the positioning hole against another holder and preventing the deformation of the positioning hole bored on the work. CONSTITUTION:In the state of separating another holder 2 from a punch 1, the work is set on the punch and then the above another holder is lowered. In this state the nest pin 4 is set at a prescribed position with the elastic body 6 against the above one side holder. Then when the above holder is lowered, at first the nest pin is inserted in the positioning hole 5 which is bored on the work W to hold the work at the prescribed position. When the holder is lowered further, the work is held with the pad 7 and the punch 1 and then the work is held with a die 3 and the punch 1, furthermore the work is subjected to bending with the die 3 and the punch. Because the nest pin is set freely slidable against another punch, so the deformation of this positioning hole is prevented.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a press device.

(Prior Art) A reinforcing member (hereinafter referred to as a member) for an automobile body as shown in FIG. 4 is positioned using nest pins during bending.

For example, to describe a press device for bending a member shown in FIG. 4, as shown in FIG. A second mold holder 2 that moves "two downwards" is provided at a position close to and a position away from the upper mold holder 2, and a die (not shown) is fixed to this upper mold holder 2.

Further, the upper die holder 2 is provided with a pad 7 for holding the workpiece V via an elastic body 8, and further includes a nest pin inserted into a positioning hole 5 drilled at a predetermined position of the workpiece V. 4 is fixed.

Then, when a blank material V before workpiece processing is set in the punch 1 and the upper mold holder 2 is lowered, the nest pins 4 are inserted into the positioning holes 5 of the workpiece W, and then the workpiece W is held by the pads 7. When the upper mold holder 2 further descends, the workpiece W is bent by the die and punch 1.

(Problems to be Solved by the Invention) After the above-described pressing process, members of an automobile are assembled to other pressed parts in a welding process.

Usually, in such a welding process, spot welding or the like is performed with each component fixed in a predetermined position by using a positioning jig. During this positioning, welding accuracy is ensured by inserting pins attached to a positioning jig into positioning holes drilled in each component, or by using guides that correspond to the external shape of the component.

However, with conventional press equipment, when bending the workpiece, the workpiece is pulled in the direction shown by arrow A in Figure 5, which deforms the positioning hole 5 into which the nest pin is inserted, causing problems in the welding process. There was a problem that it could not be used in common with the positioning hole.

If the positioning holes used in the pressing process and the positioning holes used in the welding process cannot be shared, as shown in Figure 4,
It becomes necessary to separately provide dedicated positioning holes 9 and 10 for the welding process, and as a result, the number of punches for press-type drilling must be increased.

In addition, the position of the positioning hole in the welding process and the press process does not have to be at an arbitrary position on the workpiece, but a suitable position is required for each.For example, the position of the positioning hole required in both processes is If they are close to each other, a situation may arise in which both holes cannot be drilled in the pressing process.

In this case, it is necessary to add an additional process for press drilling, or to provide a separate drilling process in the welding process.
In either case, additional steps are inevitable.

Furthermore, the positioning holes used in the second step (pressing process and welding) are not holes used in the finished vehicle, and therefore need to be closed with grommets in the assembly process.

This is because if the member is attached to the outside of the vehicle body, water or the like may enter the member while the vehicle is running, which is undesirable in terms of rust prevention.

The present invention has been made in view of the problems of the prior art, and it is an object of the present invention to provide a press device that can prevent deformation of the positioning hole.

(Means for Solving the Problems) The present invention to achieve the above object presses a workpiece using a punch fixed to one holder and a die fixed to the other holder that moves toward and away from the punch. In the press device, which presses the workpiece in a state fixed between the punch and the die by inserting a nest pin attached to the other holder into a positioning hole drilled in the workpiece during processing. The press device is characterized in that a nest pin is attached to the other holder via an elastic body so as to be slidable in the direction of deformation of the positioning hole.

(Function) In the present invention configured as described above, a workpiece is set on the punch with the other holder spaced apart from the punch, and the other holder is lowered. In this state, the nest pin is set at a predetermined position with respect to the one holder by the elastic body. Next, when the other holder is lowered, the nest pin is inserted into the positioning hole drilled in the workpiece to hold the workpiece in a predetermined position. When the other holder further descends, the workpiece is held by the pad and punch, and then bent by the die and punch. At this time, the positioning hole into which the nest pin is inserted also tries to deform due to the plastic deformation of the workpiece, but since the nest pin is provided to be able to slide freely relative to the other holder, it cannot follow the deformation of this positioning hole. Therefore, deformation of the positioning hole can be prevented.

(Example) Hereinafter, one embodiment of the present invention will be described based on the drawings.

1 and 2 are main part sectional views showing one embodiment of the present invention, FIG. 1 shows the workpiece before processing, FIG. 2 shows the workpiece during processing, and FIG. 3 shows the workpiece during processing. 5 is a cross-sectional view taken along line 1--2, and parts common to the conventional press device shown in FIG. 5 are given the same reference numerals.

First, as shown in FIG.
An upper mold holder 2 (the other holder) is provided which moves up and down between a position close to and a position away from the punch 1, and this upper mold holder 2 has a die 3 as shown in FIG. is fixed. Further, the upper mold holder 2 is provided with a pad 7 for clamping the workpiece W via an elastic body 8, and as shown in FIG. 3, the workpiece W is clamped by the pad 7 and the punch 1. At the same time, the die 3 and punch 1 perform the bending process.

In this embodiment, a slide case 11 is formed on a protruding part that protrudes from the upper mold holder 2, and this slide case 1
A nest pin 4 is attached or a retainer 13 is housed in a recess 12 formed in the recess 12. An elastic body 6 is interposed in the gap between the recess 12 and the retainer 13, and the retainer 13 and, by extension, the nest pin 4 are configured to be slidable with respect to the upper mold holder 2 by a retainer presser 14. .

Here, the elastic body 6 urges the retainer 13 to the right in FIG.

Further, in this embodiment, the sliding direction of the nest pin 4 with respect to the upper die holder 2 is configured to be the longitudinal direction of the member W, which is the workpiece, but depending on the shape of the workpiece, this sliding direction may be changed as appropriate. All you have to do is choose.

Note that the method for attaching the nest pins 4 and the retainer 13 to the second type holder 2 is not limited to the above-mentioned embodiment, and for example, the protruding portion of the upper mold holder 2 may be constructed separately, It may be fixed to the upper mold holder 2.

Next, the effect will be explained.

As shown in FIG. 1, with the upper mold holder 2 separated from the punch 1, a workpiece W is set on the punch 1, and the upper mold holder 2 is lowered. In this state, the nest pin 4 is installed at the right end in the figure with respect to the upper mold holder 2 by the elastic body 6.

Next, when the upper die holder 2 is lowered, the nest pin 4 is first inserted into the positioning hole 5 drilled in the workpiece W to hold the workpiece W in a predetermined position. When the upper mold holder 2 further descends, the workpiece W is held by the pad 7 and the punch 1 (see FIG. 3), and then bent by the die 3 and the punch 1. At this time, the positioning hole 5 that suppresses the nest pin 4 also tries to deform due to the plastic deformation of the workpiece W, but the nest pin 4 is
Since it is provided so as to be slidable in the direction of deformation of the workpiece W, it can follow the deformation of the positioning hole 5, and therefore can prevent the deformation of the positioning hole 5.

The present invention is not limited to the embodiment described above (and can be modified in various ways. For example, in the embodiment described above, the nest pin is attached to the upper holder, but the nest pin is attached to the lower holder. It is also possible to attach it to a holder.

(Effects of the Invention) As described above, according to the present invention, the nest pin is slidably attached to the other holder via the elastic body in the direction of deformation of the positioning hole, so that the positioning hole drilled in the workpiece is Deformation can be prevented, and the positioning hole can be used in common with a positioning hole used in a subsequent process such as a welding process.

[Brief explanation of drawings]

Figure 1.2 is a cross-sectional view of essential parts showing one embodiment of the present invention;
The figures are a cross-sectional view taken along the line ■--■ in FIG. 2, FIG. 4 is a perspective view showing a workpiece, and FIG. 5 is a cross-sectional view of essential parts of a conventional press device. 1... Punch, 2... Upper mold holder (other holder)
, 3...Die, 4...Nest pin, 5...Positioning hole, 6...Elastic body, W...Work, A...Deformation direction of the positioning hole.

Claims (1)

[Claims] When pressing a workpiece using a punch fixed to one holder and a die fixed to the other holder that moves toward and away from the punch, the nest pin attached to the other holder is positioned by drilling into the workpiece. In a press device that presses the workpiece while it is fixed between the punch and die by inserting it into a hole, the nest pin is moved in the deformation direction of the positioning hole with respect to the other holder via an elastic body. A press device characterized by being slidably attached.