JPS59159231A - Work positioning device in press die - Google Patents

Abstract

PURPOSE:To improve positioning accuracy, and to eliminate inconvenience for taking out a work due to competition in case when a die is opened by supporting a die holding plate so as to be floatable against a positioning rod pin, in case of a press working with positioning of a platen. CONSTITUTION:A positioning rocket pin 23 is fitted with high accuracy into a punch 26 of an upper platen 4 by a guide 24, and combined loosely with a cushion pin 6 by a locating pin base. A pad part 9 of the cushion pin 6 is fitted loosely into the punch 26 by a shaft 11. A work W on a lifter 29 is positioned exactly by a descent of a locating pin 23, and held loosely by a holding plate 8. By a descent of the upper platen, the edge part of the work W is pressed by the punch 26 and a die 27. Since the pin 23 and the holding plate 8 are in loose relation, no competition occurs, and the work is taken out easily.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a press-type workpiece positioning device equipped with a band that moves relative to a locate pin when pressing a workpiece.

For example, the assembly of a car door as shown in Fig.
As shown in FIG. 2, the periphery of the outer panel 1 is folded, the periphery of the inch panel 2 is inserted, and the folded part 3 is then spot welded or bonded. Hold it firmly in place. In that case, the flap work is
This is done by pressing with a press die for hemming, but in order to ensure assembly expertise, it is necessary to accurately position the workpiece during pressing.

As a conventional press-type workpiece positioning device of this type, there is one shown in FIG. 3, for example.

This is a pressing plate mounting base 7 that is locked to a cushion pin 6 of a cushion cylinder 5 installed inside the upper platen 4.
A pad 9 having an appropriate number of presser plates 8 is provided on the outer periphery of the pad 9. Then, a plurality of locating pins 10 are directly implanted in the holding plate former base 7 of this pad 9.

During pressing, the pad 9 is lowered together with the upper platen 4, and the workpiece W shown in FIG. , is inserted into a locating hole previously drilled in the workpiece W, and the workpiece W is positioned.

2, the rotation of the pad 9 about the cushion pin 6 is regulated by having the guide bar 11 erected on the holding plate mounting base 7 received by the pad guide 13 fixed to the upper die base I2. However, in order to smoothly move the pad 9 up and down, the guide bar 11 and pad guide 1 are
3 and ○ The mating clearance needs to be quite large.

However, in such a conventional press type workpiece positioning device, 10 locating pins are directly and integrally attached to the holding plate mounting base 7 of the pad 9, so the clearance of the pad guide 13 is limited. The play in the rotational direction of the pad 9 due to this will be directly connected to the position of the locate pin 10, and (a)
It is difficult to ensure the positioning accuracy of the soak W, or (b) the locate pin 10 and the log hole of the workpiece W and the workpiece
There were problems such as the outer periphery and the presser plate 8 coming into contact with each other, and the soak W being lifted up by the locating pin 10 and the presser plate when the mold was opened.

This invention was made by focusing on such conventional problems, and it is possible to separate the pad 9 and the locate pin 10,
It is an object of the present invention to solve the above-mentioned problems by configuring both to be able to operate relatively independently of each other.

In order to achieve the above object, the present invention provides a base for a cushion pin provided on the platen and energized in the direction of the driving force of the press ram in a conventional press-type workpiece positioning device. In a press die in which a locate pin is provided to position a workpiece, and a presser plate provided adjacent to the locate pin holds the workpiece during press processing, the presser plate is provided so as to be movable with respect to the locate pin. It is characterized by the following points.

Hereinafter, the present invention will be explained based on the drawings. FIGS. 4 to 7 are diagrams showing one embodiment of the present invention. Note that parts that are the same as the conventional ones are given the same reference numerals.

First, to explain the configuration, the holding plate mounting base 1 of the bad 9
The cushion pin 6 that is locked is extended to the workpiece W side, and the log pin base 21 is attached to the terminal thereof.

FIG. 5 shows an example of the mounting structure of the locate pin base 21, in which the locate pin base 21 is fitted into the stepped portion 6a of the locate pin 6, and the pins i-, qS 6
It is screwed to the insert 22 inserted in b. Clearance CI for each fitting part.

By providing C2 and C3, locate pin base 2
It is designed to be able to move vertically and horizontally within the visual range. A locating pin 23 is implanted in the log bin base 21 in correspondence with a log hole (not shown) previously drilled in the work W, and is fixed by a flange 23a. This locate pin 23 extends into the upper blade, penetrates the presser plate mounting base 7 in a non-contact manner, and even penetrates the upper die base I2. 24 is the locate pin 23
With the log pin guide with the long part inserted,
All Sr,-,,l2I(!!To die base 12)
The locating pin 23 is pivotally supported on the senryu 1 in the direction F through the bush 25. - Hearing 4 figure is upper type 26
The workpiece W is shown being pressed (hemmed in this case) by descending toward the lower die 27, and the pad 9 holding the workpiece at this time occupies a raised position relative to the upper die 26. . For this reason, an insertion hole for the log pin guide 24 is provided in the presser plate collection base 7 so as not to hinder the rise of the pad 9. 28 is a lower retainer to which the lower die 27 is attached, and 29 is a lifter which is installed inside the J-blanket 28 or is driven up and down by a lid cylinder 30. 31 is a conveyance comb roller provided on the lifter 29, 32 is a lifter guide, and the lifter guide/<-
33 is supported via a pusher 34 to guide the vertical movement of the lifter 29. Note that 35 is an air circuit connecting the directional control valve and the lid cylinder 30 (not shown).

Next, the action will be explained.

Figure 6 shows the mold open state, with the lid at the upper limit and the lid 2.
A workpiece W to be press-formed from now on is placed on 9. The piston 5a of the cylinder 5 is located at the forward limit, and both the rod 9 and the locate pin 23, which are supported by the cushion pin 6 which is the piston rod, are at the forward limit.

When the press operation starts, the upper grating 4 descends (r
iii) begin to do. The pad 9 and the locating pin 23 constituting the workpiece positioning device are lowered together with the second die 26 fixed to the upper platen 4 VC, and eventually the tip of the locating pin 28 first reaches the locating hole of the workpiece W. At this time, the pad 9 may deviate from its normal position due to the rotational play caused by the thick guide clearance described above. However, locate pin 2
3 is separated from the holding plate mounting base 7 of the pad 9,
Since the locating pin guide 24 fixed to the type 2 base 12 is guided independently of the pad 9 through the bushing 25, which has no backlash, it is possible to fit into the locating hole accurately. Almost simultaneously with this fitting, the holding plate 8 of the pad 9 comes into contact with the workpiece W, resulting in the state shown in FIG. 7. Even if the pad 9 is slightly misaligned, the mounting clearances CI, C2, etc. are provided between the terminal 6a of the cushion bin 6 that supported it and the locate pin base 21, so the pad 9 will not be able to match the locate pin 23. They can move independently and adjust their positions individually, and both 9 and 23 will not come into contact with each other.

The workpiece W, which has been accurately positioned by the locating pin 23 and held by the pad 9, is moved further along with the upper platen 4, which continues to descend, and the lifter 29, which begins to descend in synchronization with this. descend. Although the workpiece W reaches the lower die 27 and stops, the upper platen 4 continues to descend. Then, an upward force acts on the pad 9 holding the workpiece W, and the pad 9 moves upward while compressing the air sealed inside the cylinder with the piston 5a of the cushion cylinder 5. That is, the pad 9 and the locate pin 23 are raised relative to the lowering of the upper die 26,
Positioning of the work W and holding by the cushion pressure of the cushion cylinder 5 can be maintained. In this state, the upper mold 26 comes into contact with the hemming portion of the workpiece W that has been hemmed in a separate process, presses it, and completes the hemming. (See FIG. 4) Even when the upper platen 4 is raised to open the mold, the locating pins 23 fit into the locating holes without coming into contact with each other, so there is no fear that the workpiece W will be lifted up by the locating pins 23.

Note that the present invention can be applied to presses other than hemming, and a pad and a workpiece positioning device may be provided on the F-type side.

As explained above, according to the present invention, the structure is such that a cushion bin provided on the platen and energized in the driving direction of the breath ram is provided with a base kF9°, and a log-out pin for positioning the workpiece is provided on this base. In a press mold in which the workpiece is set at position 1 and the workpiece is held and pressed by a presser plate provided adjacent to the locating pin described in 1Vij, the old presser plate is set 7 to the locating pin and the Because it was set in
Regardless of the Bud's guide tension + 'JICE, it is possible to secure one pinion for positioning the workpiece, and it also prevents the phenomenon that the workpiece and the root pin come into contact with each other when the mold is opened, which hinders the removal of the workpiece. It will be done.

[Brief explanation of the drawing]

Fig. 1 is a trunk view showing an example of a workpiece, Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1, Fig. 3 is a sectional view of essential parts of a press die equipped with a conventional workpiece positioning device, and Fig. 4 5 is a partially enlarged view of FIG. 4, FIG. 6 is a sectional view of essential parts of the embodiment shown in FIG. 4, showing the state when the mold is opened, and FIG. This figure is a cross-sectional view of the main part of the same container as shown in FIG. 4 during the mold closing process. 6・−・・・・・・・・・・Cushion bin 7−・・−
・・・・・・・・・Example base for holding plate 8・・・・・・・・・
...Press plate 9...Bud 12...Upper die base 21...Locate pin base 23--
・・・・・・Locate pin W・・・・・・・・・Workpiece diagram 1 Figure 2 Diagram 4 Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] A cushion bin provided on the platen and energized in the driving direction of the press ram is provided with a base, and a locate pin for positioning the workpiece is provided on this base to position the workpiece. A workpiece positioning device for a press die, characterized in that the holding plate is provided so as to be freely movable with respect to a locating pin.