JPH07314397A - Punching edge and punching method using it - Google Patents

Abstract

PURPOSE:To reduce a burden on a worker by saving labor for take-out operation of a formed product after punching. CONSTITUTION:A punching is performed using punching edges 3 of such a form as having an upper wall part of which inner wall surface is approximately vertical and a lower wall part which is notched in stepped shape relative to the upper wall part. In punching, a formed product is punched from a sheet to be punched 14 by the relative movement of a female mold 1 with the punching edges 3 to a male mold 11 opposed to the female mold 1, and the female mold 1 is moved to a formed product take-out position with the formed products 1 held on the upper wall part of the punching edges 3. Then, at the formed product take-out position, the formed products held on the upper wall part of the punching edges are dropped by pushing them out by a formed product extruding machine.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a punching blade used for a punching die for punching a resin-molded sheet into a predetermined shape, and a punching method for obtaining a desired molded product using the punching blade. It is a thing.

[0002]

2. Description of the Related Art Conventionally, as a punching method for punching a sheet to be resin-molded to form a resin-molded article such as a tray, a lower die having a punching blade and a lower die opposed to each other are disposed. There is known a processing method in which a sheet to be processed is punched out by a relative movement with an upper die formed as described above.

FIG. 9 shows an explanatory view of a conventional punching method of this kind. As shown in the figure, in the conventional punching method, a lower die 53 having a punching blade 52 protruding upward from a substrate 51, and a ram that is disposed so as to face the lower die 53 and can be moved up and down. An apparatus including an upper die 54 is used, and the upper die 54 is pushed down by a predetermined stroke in a state where the sheet 55 to be processed is placed on the punching blade 52 of the lower die 53, whereby the sheet 54 to be processed is cut by the punching blade 52. The required part is punched out, and the molded product after punching 5
6 is held by the inner wall surface 52a of the punching blade 52, or placed on the substrate 51 and held. After this punching process, the lower die 53 is moved to the take-out position outside the apparatus, and the molded product 56 is taken out manually by the operator at this take-out position.

[0004]

However, in the conventional punching method as described above, the molded product 5 is punched.
Since the work of taking out 6 must be performed manually by the operator, there is a problem that this taking out work is extremely complicated.

In order to deal with such a problem, a means for paying out the molded product 56 is provided at the take-out position, and the molded product 56 is paid out on the conveyor by this paying-out means to automate the work for taking out the molded product. It is possible. However, in such a case, since the posture of the molded product 56 after paying out is not constant, the work of stacking the molded products 56 discharged from the conveyor is separately required, and there is still a difficulty in labor saving. There are also problems in terms of worker safety and hygiene.

The present invention has been made in order to solve the above problems, and a punching blade and a punching blade which can reduce the burden on the operator by reducing the labor of taking out a molded product after punching. It is an object of the present invention to provide a punching method using the punching blade.

[0007]

In order to achieve the above-mentioned object, a punching blade according to the present invention is a punching blade used in a punching die for punching a sheet to be processed into a predetermined shape, which has an inner wall surface. Is characterized by having a substantially vertical upper wall portion and a lower wall portion formed by cutting out a predetermined amount from the upper wall portion.

Further, the punching method according to the present invention is a punching method using a punching blade having the above-mentioned characteristics, which is (a) a lower die having the punching blade and an upper die facing the lower die. A punching step of punching a molded product from the sheet to be processed by relative movement with (b) after this punching process, the lower mold is held at the upper wall portion of the punching blade and the lower mold is brought to a molded product take-out position. And a step of moving the lower die, and (c) a step of pushing out the molded article held on the upper wall of the punching blade and dropping the molded article after the lower die moving step. .

[0009]

In the punching blade according to the present invention, the inner wall surface is
Since it has a substantially vertical upper wall portion and a lower wall portion cut out by a predetermined amount from the upper wall portion, the punched molded product is temporarily held by the upper wall portion. When the molded product is taken out, the molded product can be smoothly taken out by the lower wall portion which is cut out by a predetermined amount from the upper wall portion by the pushing operation of the molded product.

In the punching method according to the present invention,
First, in a punching step, a molded product is punched from a sheet to be processed by the relative movement of a lower die having a punching blade having the above-described configuration and an upper die facing the lower die. At this time, the molded product after punching is in a state of being temporarily held by the upper wall portion of the inner wall surface of the punching blade. From this state, the lower mold is moved to the molded product take-out position while holding the molded product in the lower mold moving step, and then the molded product held by the punching blade is extruded and dropped in the molded product extruding step. In this way, since the molded products after the punching process are sequentially stacked below the lower mold located at the molded product take-out position, it is possible to eliminate the manual taking-out work or the stacking work of the worker, thereby saving labor. .

[0011]

Next, specific examples of a punching blade and a punching method using the same according to the present invention will be described with reference to the drawings.

A punching die according to an embodiment of the present invention is shown in FIG. 1. A sectional view (a sectional view taken along the line AA in FIG. 1) of the punching die in an attached state in a punching machine is shown in FIG. Is shown in. This embodiment is applied to punching a polypropylene molded product such as a strawberry container.

As shown in the drawing, in a punching die (hereinafter referred to as a lower die) 1 of this embodiment, a rectangular substrate 2 and
A punching blade 3 protrudingly provided on the substrate 2 is provided. The punching blade 3 is a closed curved surface (rectangular curved surface with a predetermined rounded corner in the example in the figure) which is closed according to the outline of the molded product obtained by punching. A plurality (9 in the example of FIG. 1) on the substrate 2.
They are arranged regularly. Further, the substrate 2 is provided with a molded product discharge hole 4 in a portion surrounded by the closed curved surface of each punching blade 3.

As shown in FIG. 3, the cross-sectional shape of the punching blade 3 is such that the tip portion of the outer wall surface is from the tip side to the first blade surface 5 and the second blade surface 6 having an acute angle from the first blade surface 5. And a two-step blade having an inner wall surface that is continuous with the substantially vertical upper wall portion 8 and that is cut out in a stepped shape with respect to the upper wall portion 8. It has a shape including a vertical lower wall portion 9. Needless to say, the shape of the punching blade 3 need not be limited to the two-step blade, and may be a three-step blade, or a curved shape instead of the stepped shape.

As shown in FIG. 4, the lower die 1 having the above-described structure is, relative to the punching machine 10, a processing position inside the processing machine main body and a processing sheet set position (or a molding position) outside the main body. It is attached so as to be movable in the horizontal direction (direction of arrow A-B) with respect to the product pickup position). Also,
In this punching machine 10, an upper die 11 is provided at an upper position facing the lower die 1 at the processing position. The upper die 11 has a contact plate 12 (see FIG. 2) made of resin, iron or stainless at a portion contacting the punching blade 3 and can be moved up and down in the vertical direction (direction of arrow CD) by a ram 13. Has been done. Therefore, when the upper die 11 is moved downward in the direction of the arrow D with the vacuum-formed work sheet 14 placed on the punching blade 3 of the lower die 1, the work is performed by the blade surfaces 5 and 6 of the punching blade 3. A required portion of the sheet 14 is punched out. Although FIG. 2 illustrates a case where only one sheet 14 is punched, in actual punching, for example, 4 to 5 sheets (in some cases, 8 to 10 sheets) as shown in FIG. The sheets 14 to be processed are punched at the same time.

A molded product extruder having a plurality of pushers 15a at positions corresponding to the respective molded product discharge holes 4 of the lower mold 1 above the sheet set position (or molded product take-out position) of the lower mold 1. 15 is also provided so as to be movable up and down in the direction of arrow CD, and a molded product mounting table 16 is provided so as to be movable vertically at a position facing the molded product extruder 15 with the lower mold 1 interposed therebetween. ing.

Next, the punching operation of the sheet 14 to be processed by the punching machine 10 of this embodiment will be described with reference to FIGS.

In punching the work sheet 14, first, the lower die 1 is drawn out to the work sheet setting position (FIG. 5), and several work sheets 14 stacked on the punching blade 3 are placed at this drawing position. (Fig. 6). Then, the lower die 1 is moved to a processing position in the main body of the punching machine 10, the ram 13 is lowered by a predetermined stroke at this processing position, and the blade edge of the punching blade 3 is pressed against the contact plate 12 to cut the blade surface 5. , 6 punches the required portion of the work sheet 14. At this time, the punched molded product 17 does not drop downward and is temporarily held by the substantially vertical upper wall portion 8 of the inner wall surface of the punching blade (FIG. 7).

Subsequently, the lower mold 1 is pulled out to the molding product take-out position (the same position as the work sheet setting position) while holding the molding product 17 by the upper wall portion 8 of the punching blade 3. After that, when the pusher 15a of the molded product extruder 15 is moved downward and the molded product 17 is pushed downward by the pushers 15a, the molded product 17 held by the upper wall portion 8 is notched in a stepped shape. It is pushed out to the lower wall portion 9 that is open and its holding is released (FIG. 8), and it smoothly falls and is placed on the molded product placing table 16 below. In addition, this molded product mounting table 1
In order to make the drop distance of the molded product 17 constant, the molded product 6 is mounted on the molded product 17 after one mounting of the molded product 17.
Is moved down by a distance corresponding to the height of.

By repeating the above operation,
The molded products 17 are sequentially stacked on the molded product mounting table 16. In each operation described above, various sensors are provided at appropriate positions, and the punching machine 10, the molded product extruder 15, and the molded product mounting table 16 are controlled by a control device (not shown) to which signals from these sensors are input. This is done automatically.

In this embodiment, the upper die 11 is moved up and down with respect to the lower die 1 to punch the sheet 14 to be processed.
The lower mold 1 may be moved up and down with respect to the upper mold 11.

[0022]

As described above, according to the present invention, the work of taking out and stacking the molded products after the punching can be automatically performed without the manual work of the operator, so that the labor saving can be achieved. And shortening of the processing process can be achieved.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a punching die according to an embodiment of the present invention.

FIG. 2 is a sectional view (sectional view taken along the line AA of FIG. 1) showing a state where a punching die is mounted in a punching machine.

FIG. 3 is a sectional view of a punching blade.

FIG. 4 is a partial cross-sectional view showing the overall structure of a punching machine.

FIG. 5 is an explanatory diagram of a punching operation of a sheet to be processed.

FIG. 6 is an explanatory diagram of a punching operation of a sheet to be processed.

FIG. 7 is an explanatory diagram of a punching operation of a sheet to be processed.

FIG. 8 is an explanatory diagram of a punching operation of a sheet to be processed.

FIG. 9 is an explanatory diagram of a conventional punching method.

[Explanation of symbols]

 1 Punching Die (Lower Die) 2 Substrate 3 Punching Blade 4 Molded Product Discharge Hole 5 First Blade Surface 6 Second Blade Surface 8 Upper Wall 9 Lower Wall 10 Punching Machine 11 Upper Die 12 Patch Plate 13 Ram 14 Worked Sheet 15 Molded product extruder 16 Molded product mounting table 17 Molded product

Claims (2)

[Claims] 1. A punching blade used in a punching die for punching a sheet to be processed into a predetermined shape, the inner wall surface of which is a substantially vertical upper wall portion, and a predetermined amount of notch is formed in the upper wall portion. A punching blade having a shape having a bottom wall portion formed by being cut. 2. A punching method using a punching blade according to claim 1, wherein: (a) the sheet to be processed is caused by relative movement of a lower die having the punching blade and an upper die facing the lower die. A punching step of punching a molded product from (b) a lower die moving step of (b) moving the lower die to a molded product take-out position while holding the molded article on the upper wall portion of the punching blade after the punching step; ) A punching method comprising a molded product extruding step of pushing out and dropping the molded product held on the upper wall portion of the punching blade after the lower mold moving process.