JPH01197024A - Method for press forming and metal die for press forming - Google Patents

Abstract

PURPOSE:To rapidly transfer a product by a sucking means by pushing down a stripper plate together with a stop pin and pushing a stock onto a blanking punch by a knockout, and moving an upper die and the stripper upward to returned to an initial position. CONSTITUTION:A stop pin 25 projects from the surface of stripper plate 23 by a dimension larger than a sheet thickness (t) of a stock 2 to be worked and a gap of a difference between the projected height and the sheet thickness between the stock 2 and the knockout and a die plate 6 when the plate 6 abuts on the pin 25 in press forming. After punching a product, the stock 2 is transferred from the die plate 6 side to the stripper plate 23 side through the gap and the punched product is pushed up at the time of upward movement of an upper die 3. The product falls into a product punched hole by own weight and is positioned. Thus, ejection and transfer of a product by a sucking means is easily and positively performed, so that continuous punching work is performable.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a press molding method and a die therefor that enable easy and quick product removal operations and shorten the punching cycle.

[Conventional technology]

Conventionally, the press forming method, which manufactures products with a desired shape by punching processed materials, has a lower mold consisting of an outer punch and a stripper plate, an upper mold consisting of a knockout and a die plate, and a lowering of the upper mold. The upper mold is pressed against the lower mold through the material to be processed, and the material to be processed is punched out by an outer punch and a knockout. In this case, the stripper plate and the die plate are provided so as to be movable up and down relative to the outer punch and the knockout, respectively, and the die plate pushes the stripper plate down to the bottom dead center position when punching the workpiece. After punching, the upper mold is raised and returned to its original position, and the compressed air blows the punched product out from above the outer punch or drops it from the lower mold, and the material to be processed is fed to a predetermined size for the next punching process. are performed continuously.

[Problem to be solved by the invention]

However, in this conventional press forming method,
When the products are blown out with compressed air and dropped under their own weight below the lower mold and stored in a storage container, they are stored irregularly, so some products had to be aligned before being transferred to the next process.

In addition, simply blowing away the blow-off will not be consistent depending on the product, which will impede the feeding of the processed material and the next punching process, which also has the disadvantage that smooth continuous punching cannot be achieved.

Therefore, the present invention solves the above-mentioned problems,
The object of the present invention is to provide a press molding method and a mold thereof, which have an extremely simple configuration and allow for easy and quick removal of the product after punching and continuous punching work.

[Means to solve the problem]

The present invention has been made to achieve the above object, and a press forming method according to the first invention includes a stop pin of a lower mold that protrudes from the surface of a stripper plate with a protrusion dimension larger than the thickness of the material to be processed. , the upper mold is lowered along the guide pin to bring the die plate into contact with the stop pin, and in this state, the upper mold is further lowered to the bottom dead center position, so that the die plate moves the stripper plate into contact with the stop pin. At the same time as pushing down the strip/flange plate together with the stop pin, the knockout presses the processed material against the outer punch and punches it out, and then the upper mold and the stripper plate are raised and returned to punch out the product punched part of the processed material. The product is fitted into the container by its own weight, and then the product is suctioned and held by suction means and transported.

Further, the second invention provides an outer punch, a lower die including a stripper plate having a stopper pin and which is movable up and down with respect to the outer punch, a knockout, and a lower mold which is movable up and down with respect to the knockout. and an upper die equipped with a die plate provided in the press die, and the press die punches the workpiece by the outer punch and the die plate,
The stop bin is made to protrude from the surface of the stripper plate with a protruding dimension larger than the thickness of the processed material.

[For production]

In the present invention, the protrusion dimension of the stopper pin from the stripper plate is set to be larger than the plate thickness of the workpiece material, and a floating gap is provided between the die plate and the stripper plate in which the workpiece material can move up and down. ,
When the upper die is raised and returned to its original position, the stripper plate is also raised and returned to its original position, and the product is pushed into the product hole in the processed material due to its own weight. Then, a suction means suctions and holds this and conveys it to a predetermined location. Therefore, the product can be taken out reliably, and there is no possibility that it will interfere with the next punching process.

〔Example〕

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

FIG. 1 is a sectional view of a press mold according to the present invention, FIG. 2 is a bottom view of the upper mold, and FIG. 3 is a plan view of the lower mold. In these figures, a press mold 1 includes an upper mold 3 and a lower mold 4 that face each other with a workpiece 2 in between.

The upper mold 3 includes knockouts 5 arranged in a stacked manner. It is composed of a die plate 6, a punch plate 7, a para kink plate 8, an upper base 9, etc.

The knockout 5 is slidably inserted into a center hole of a frame-shaped die float, and is biased by a knockout spring 10 in the direction of projecting downward from the die plate 6. Further, the knockout 5 and the upper base 9 are connected to each other by a hanging bolt 1). in this case,
The middle part of the bolt 1) is inserted into the insertion hole provided in the punch plate 7 and the backing plate 8, and the lower end part is screwed into the screw hole of the knockout 5, so that the upper base 9 is connected to the knockout spring 10. It is constructed so that it can be lowered against the resistance.

A hole punch 13 is disposed on the punch plate 7 with its lower end inserted into the punch insertion hole 14 of the knockout 5. The punch plate 7, backing plate 8, and upper base 9 are integrally connected by a plurality of tightening bolts 16. The lower surfaces of the knockout 5 and the die plate 6 normally form the same plane.

The lower mold 4 includes a lower base 20 . Backing plate 21. Outside punch 22. stripper plate 2
3. It is composed of a guide pin 24, a stop bin 25, and the like. The lower base 20° backing plate 21 and the punch 22 are layered and positioned by positioning pins 26, and a plurality of bolts are integrally connected by bolts 27. The stripper plate 2
3 is formed in a frame shape like the die plate 6.
It is slidably fitted onto the outer periphery of the outer punch 22 and is biased upward by the stripper spring 28, so that its upper surface normally forms the same plane as the upper surface of the outer punch 22.

The guide pin 24 guides the die plate 6 during punching and protrudes above the stripper plate 23, and a guide hole 30 is formed through the die plate 6 in correspondence with the guide pin 24. The stop bin 25 is provided on the stripper plate 23 to receive and lock the die plate 6 during press molding, and its head protrudes from the surface of the stripper plate 23 to a value larger than the thickness t of the processed material 2. Dimension X (x>t
) stands out.

In the press die 1 having such a configuration, the protrusion dimension X of the stop pin 25 is equal to the protrusion dimension X' in the conventional device.
(usually x:=t) except that it is larger. The work material 2 is made of a belt-shaped metal plate having a required thickness t, and is fed onto the outer punch 22 and stripper plate 23 along the guide pin 24 during punching, and the upper die 3 is lowered. As a result, parts corresponding to the knockout 5 and the outer punch 22 are punched out as a product 35 (FIG. 6(C)).

Next, the process of punching out the processed material 20 will be explained in detail based on FIGS. 4 to 8.

FIG. 4 shows a state in which the upper die 3 is lowered until the die plate 6 comes into contact with the stop bin 25. In this state, a gap G of x-t is set between the surface of the workpiece 2 and the lower surfaces of the knockout 5 and the die plate 6, and this gap G is set against the product 35 when the upper die returns to the upper die, which will be described later. have important meaning.

The upper mold 3 continues to descend even after the die plate 6 contacts the stop bin 25. Therefore, the knockout 5 comes into contact with the workpiece 2 and clamps it with the outer punch 22, as shown in FIG. Therefore, the knockout 5 is prevented from descending by the outer punch 22, but the die plate 6, punch plate 7, backing plate 8, and upper pace 9 are able to move up and down with respect to the knockout 5 and resist the knockout spring 10. The die rate 6 then presses down the strip bin 25 and the material 2 to be processed.

As a result, the product 35 is the knockout 5 and the outer punch 22.
The processed material 2' is punched out from the processed material 2, and after the product 35 has been punched out, the processed material 2' falls onto the stripper plate 23 from the lower surface of the soybean tray.

FIG. 7(a) shows this state. After the product 35 is press-molded, the upper die 3 is raised and returned to the initial position. At this time, the soybean latero and the stripper plate 23 rise while maintaining the distance X, and the die plate 6 moves upward as shown in FIG.
), the knockout 5 starts to rise and releases the clamping state of the product 35 between the outer punch 22 and the knockout 5. When the stripper plate 23 rises and returns to the height position shown in FIG. 4(b), the product 35 is placed in the product hole 36 [FIG. 6(C)] of the processed material 1 as shown in FIG. 7(6). (It will fit lightly due to its own weight)
It's crowded.

At this time, the product 35 does not fit in completely due to the occurrence of cracks due to the punching process, and only the lower side is indented, and the upper side protrudes as shown in FIG. This stuck-in phenomenon is caused by the protruding dimension X of the stop pin 25)
The production 35 is made possible by being set and held between the knockout 6 and the outer punch 22 so as to be vertically movable. In this case, if the protrusion dimension cannot be pushed up, and the product 35 is forcibly pushed into the product punching hole 36 so as to form the same plane as the processed material 1, and cannot be pulled out. In this respect, as described above, when a part of the product 35 is stuck in due to its own weight, it is not tightly fitted and can be easily removed. Then, the upper die 3 returns to the top dead center position, the workpiece 2 is fed out from the press die 1 by a predetermined pitch, and the product 35 is transferred to the suction means 4 shown in FIG.
After the product is extracted from the product punching hole 36 and stored in a storage case (not shown), the next product is pressed. The suction means 40 is rotatably disposed in a horizontal plane on the work material delivery side of the press mold 1, and when the work material 2 is fed out, it operates to suction and hold the product 35, and The product is removed from the removal hole 36. In this case, since the product 35 is positioned by the product extraction hole 36, the holding position by the suction means 40 can be kept constant, and the product 35 can be held and transported easily, reliably, and quickly. Can be done. Therefore, the punching operation can be performed continuously, and the punching cycle time can be shortened.

Moreover, according to the holding and conveying system for the products 35 using the suction means 40, it is possible to regularly store the products 35 in a predetermined case.

〔Effect of the invention〕

As described above, in the press molding method and its mold according to the present invention, the stop pin provided on the stripper plate is made to protrude from the surface of the stripper plate with a protruding dimension larger than the thickness of the processed material, so that during press molding, When the die plate touches the stop pin,
Between the processed material and the knockout and die plate,
A gap having a size obtained by subtracting the thickness of the processed material from the protrusion size can be formed. The existence of this gap causes the processed material to move from the die plate side to the stripper plate side when the product is punched out, and also causes the processed material to push up the punched product when the upper mold returns to its upward position.

Therefore, the product is pushed into the product extraction hole of the processing material by its own weight and positioned, so the product removal position can always be kept constant, and the product can be easily and reliably removed and transported by the suction means. do. As a result, continuous punching work is possible and productivity can be improved.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of the press mold according to the present invention, Fig. 2 is a bottom view of the upper die, Fig. 3 is a plan view of the lower die, and Fig. 4 and Fig. 8 are in accordance with the present invention. Figures 4(a) and 4(b) are a half-sectional view and an enlarged sectional view of essential parts showing a state in which the upper die is lowered and the die plate is brought into contact with the stop pin. , Fig. 5 is an enlarged sectional view of the main part showing the state in which the upper die is further lowered and the knockout is brought into contact with the processed material, Fig. 6 (a) I (b) # (
e) is a half-sectional view showing the state in which the upper die has been lowered to the bottom dead center position, an enlarged sectional view of the main part, and a perspective view showing the state of the processed material and the punched product; Figs. 7(a) and (b) ) is a cross-sectional view and a perspective view of the main part when the stripper plate starts to rise and return after punching and the processed material hits the product, No. 8
Figures (a) and (b) are a half-sectional view and an enlarged view of essential parts showing how the suction means holds and conveys the product. 1...Press mold, 2...Processing material, 3...
・Upper die, 4...Lower die, 5...Knockout, 6
... Die plate, 22 ... Outer punch, 23
... Stripper Pumano), 25...Stop pin, 35... Product, 36...Product extraction hole, 40...Adsorption means. Figure 5 Figure 7 Figure 8

Claims (2)

[Claims] (1) Make the stop pin of the lower die protrude from the surface of the stripper plate with a protrusion dimension larger than the plate thickness of the processed material, and lower the upper die along the guide pin to bring the die plate into contact with the stop pin. Then, in this state, the upper mold is lowered to the bottom dead center, so that the die plate presses down the stripper plate together with the stop pin, and at the same time, the knockout presses the workpiece against the outer punch and punches it, and then the upper mold and the By raising and returning the stripper plate, the punched product is fitted into the product hole of the processed material by its own weight,
A press molding method characterized in that the product is then suctioned and held by a suction means and conveyed. (2) an outer punch, a lower die equipped with a stripper plate having a stop pin and movable up and down relative to the outer punch, a knockout, and a stripper plate provided movably up and down with respect to the knockout; and an upper mold having a die plate, and the press mold punches the workpiece by the outer punch and the die plate. A press mold characterized by a protruding dimension.