JPS6110956Y2 - - Google Patents

Description

[Detailed description of the invention] The invention is to automatically shear and take out plastic molded products made by vacuum (pressure) molding, extrusion molding, blow molding, injection molding, etc. that require finishing by punching the outer periphery. This relates to a device that can perform

When performing shear processing by press punching in the external punching process of plastic molded products, 1. A method of suctioning the product to a suction cup in the upper mold, releasing the suction after opening the mold, and taking out the product onto the tray for taking out. , 2) A method in which the product is left in the lower mold of the press and the product is taken out of the mold using an attachment (chuck method/suction method). There is a problem in that a reduction in suction capacity due to clogging of the equipment filter is inevitable, and reliable removal cannot be maintained for a long period of time, which increases the number of regular maintenance steps. In addition, method 2) complicates the product removal and transportation system, greatly increases equipment costs, and increases the product attachment time, making removal less reliable, and is particularly unsuitable for products with low rigidity. Problems such as .

The present invention is intended to eliminate the above-mentioned drawbacks of conventional devices.When cutting the outer periphery of a product by fitting and closing a cutting die consisting of an upper die and a lower die, spring bags are generated in the product. To provide a device which has a simple structure and can automatically and reliably take out a product by utilizing the fact that the product is bitten by an upper mold.

That is, the workpiece retrieval device of the present invention is a shear processing device for plastic products that punches the outer periphery of a workpiece by fitting a lower mold into an upper mold and closing the mold, in which the upper mold is constantly energized downward. The product holding pad is locked to the upper mold from mold closing to mold opening, and when the product is taken out after opening the mold, the lock is released and the product fitted on the mold surface of the upper mold is placed on the upper mold. The device is characterized in that it is provided with a locking means for extruding the product from the mold using the product holding pad.

Hereinafter, the device of the present invention will be explained using the drawings.

FIG. 1 is a cross-sectional view showing a first embodiment of the apparatus of the present invention, and FIGS. 2A, 2B, and 2C are schematic cross-sectional views showing the state when shearing and taking out the material using the apparatus of FIG. 1.

In the figure, 1 is an upper mold with a concave cross-section, and 2 is a lower mold with a convex cross-section that matches the workpiece A. After covering the workpiece A on the convex part 2a of the lower mold 2, the upper mold 1
is lowered and the lower mold 2 is fitted into the recess 1a of the upper mold 1 (mold closing), and the outer periphery of the workpiece A is punched.

The product holding pad 3 has a concave portion (product holding portion) 3a shaped to match the workpiece A on the lower surface of the pad.
Lock grooves 4 on opposite side walls of pad 3,
This pad 3 is connected to the upper surface of the recess 1a of the upper mold 1 by means of suspension springs 5,5.

Therefore, the product holding pad 3 is urged downward with its tip surface constantly protruding from the tip surface of the upper mold 1.

The padlock unit 6 consists of a cylinder 6a and padlock pins 6b operated by the cylinder 6a, and is attached to both side walls of the upper mold 1, respectively. Padlock pins 6b, 6b
is the recess 1 from the outer periphery at a predetermined position on the side wall of the upper mold 1.
They are inserted into the pin slide holes 1b, 1b penetrating the inner periphery of the product, and the tips of the pins 6b, 6b are always in a position that coincides with the inner peripheral wall of the upper mold recess 1a, so that the product holding pad 3 is inserted into the upper mold recess 1a. When the cylinders 6a, 6a are operated after the slide holes 1b, 1b and the grooves 4, 4 are in communication with each other, the tips of the lock pins 6b, 6b move forward and enter the grooves 4, 4. After fitting, the product holding pad 3 is locked onto the upper die 1. 1e is a spacer provided on the ceiling surface of the recess 1a of the upper mold 1.

In the apparatus configured as described above, in order to punch out the outer periphery of the workpiece A and take out the product, the workpiece A is first placed on the upper surface of the lower die 2. The upper mold 1 is lowered to close the mold, punch out the outer periphery of the work A, and shear the work A into a product B and scrap C.

Here, when the upper mold 1 descends, the product holding part 3a of the product holding pad comes into contact with the workpiece A, and as the upper mold 1 further descends, the springs 5, 5 are compressed, and the product holding pad 3 presses against the upper mold. It rises in the recess 1a, contacts the spacer 1e, and stops at the uppermost position, that is, the position where the grooves 4, 4 of the pad 3 and the slide holes 1b, 1b of the upper mold 1 communicate with each other. At this point, actuate the cylinders 6a, 6a to advance the locking pins 6b, 6b into the grooves 4, 4, respectively;
Lock the product holding pad 3 to the upper die 1 (Fig. 2A).

After that, the upper mold 1 is raised and opened, but at this time, the pressure from below is removed from the pressure applied to the product B from above and below, so a spring packing force acts on the product B, causing the upper mold recess 1a to be compressed. It fits in and rises together with the upper mold 1 (Figure 2 B).

With the product holding pad 3 locked to the upper die 1, the removal tray 7 is placed at a specified position below the upper die 1, and then the cylinders 6a, 6a are operated to move the lock pins 6b, 6b backwards. This releases the lock on the product holding pad 3, so that the product holding pad 3 is pressed downward by the spring force of the springs 5, 5, and this pressing force pushes the product B out of the upper die 1 and into the removal tray 7 (Fig. 2C).

In the above operation, if the cycle time of each process is set so that they can be interlocked with each other, the outer periphery of the workpiece A can be punched out and taken out completely automatically.

The springs 5, 5 have a spring force sufficient to push out the product B stuck in the upper mold recess 1a, and the lock grooves 4, 4 and the slide holes 1b, 1b of the upper mold 1 are The upper mold 1 and the lower mold 2 are positioned so that they can communicate with each other when the molds are closed. This positioning is determined, for example, by a stopper 1e in a recess 1a attached to the upper mold 1. Further, the tips of the lock pins 6b, 6b are tapered so that the lock pins 6b, 6b can smoothly enter the grooves 4, 4.

In this embodiment, the outer periphery of the workpiece A is punched by closing the mold, and at the same time, the product holding pad 3 is locked to the upper mold 1, and after opening the mold, the take-out tray 7 is positioned below the upper mold 1, and then the lock is released. Then, the product holding pad 3 is lowered by the spring force of the springs 5 and pushes out the product B, so that the product B can be taken out of the mold completely automatically. Further, the product holding pad 3 is operated by springs 5, 5 and cylinders 6, 6, and has a simpler structure than conventional devices, so there are fewer failures.

Next, a second embodiment of the device of the present invention and its operating state will be described below.

FIGS. 3A and 3B and FIGS. 4A and 4B are a top view and a longitudinal cross-sectional view showing a second embodiment of the device of the present invention and its operation.

In this embodiment, the locking means of the product holding pad 3 has a structure different from that of the first embodiment.

As shown in the figure, the product holding pad 3 is moved into the upper mold recess by springs 5, 5, 5 and guide pins 9, 9 which slide through holes 1α, 1α vertically penetrating the recess 1a from the upper mold upper surface 1c. It is suspended within 1a. The guide pins 9, 9 have flanges 9a, 9a at their upper ends projecting to the upper mold upper surface 1c, and these flanges 9a, 9a engage with the upper mold upper surface 1c to position the lower end of the product holding pad 3.

The padlock units 6, 6 provided on the upper surface 1c of the upper mold have cylinders 6a, 6a, rods 6c, 6
c and U-shaped blocks 6d, 6d attached to the tips of the rods 6c and 6c and having open ends at the front, and the U-shaped blocks 6d, 6d move on the upper mold upper surface 1c as the rods 6c, 6c move forward and backward. do it like this.

In the above embodiment, the product holding pad 3 is locked by actuating the cylinders 6a, 6a when the pad 3 rises, the guide pins 9 rise, and the flanges 9a, 9a separate from the upper mold upper surface 1c. 6
c and 6c are moved forward, and the U-shaped blocks 6d and 6d are inserted between the flanges 9a and the upper mold upper surface 1c, and the lower surfaces of the flanges 9a and 9a are inserted into the U-shaped block 6.
This is done by bringing it into contact with d and 6d.

The U-shaped block contact surfaces of the flanges 9a, 9a are
The U-shaped blocks 6d and 6d are tapered so that no load is applied to them.

In this embodiment, the product holding pad 3 is provided with flanges 9a, 9a at the upper end protruding from the upper mold upper surface 1c.
When the product holding pad 3 rises and the flanges 9a, 9a of the guide pins 9, 9 are separated from the upper surface 1c of the upper mold 1, , this flange 9
This locks the pad 3 to the upper mold 1 by inserting blocks into a and 9a, making the locking more reliable and sufficiently dealing with slight variations in the position of the lower mold 2 when closing the mold. be able to. This embodiment is particularly suitable for products where the product shape is flat and the vertical movement distance of the product presser pad is not very large.

As is clear from the above description, the device of the present invention:
The product holding pad is always held against the upper mold, and is locked to the upper mold after the mold is closed until the product is taken out.The locking means can be achieved by operating a cylinder using a spring or guide pin. As a result, the structure is simpler than that of conventional devices, and reliable product removal can be maintained for a long period of time. In particular, the device of the present invention is designed to push down the product holding pad with the force of a spring, thereby pushing the product out of the mold, so it is fully applicable to products with low rigidity.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view showing the first embodiment of the device of the present invention, Fig. 2 A to C are schematic cross-sectional views showing the shearing and extraction process using the device of the first embodiment, and Figs. , and Figures 4A and 4B show the second part of the device of the present invention.
A top view and a vertical cross-sectional view showing an example are shown. In the figure, 1... upper die, 2... lower die, 3... product holding pad, 4... lock groove, 5... spring,
6...Pack lock unit, 6a...Cylinder, 6b...Lock pin, 6c...Rod, 6d...
...Block, 7...Saucer, 9...Guide pin.

Claims (1)

[Scope of utility model registration request] In a shearing device for plastic products that punches the outer periphery of a workpiece by fitting a lower mold to an upper mold in a mold closing manner, the upper mold is equipped with a product holding pad that is constantly biased downward, and a product holding pad that presses the product from the mold closing to the mold closing pad. The product holding pad is locked to the upper mold until opening, and the lock is released when the product is taken out after the mold is opened, and the product fitted on the mold surface of the upper mold is extruded from the upper mold by the product holding pad. A workpiece retrieval device for plastic shearing processing, characterized in that it is provided with a means.