JPH06154921A - Press - Google Patents

Abstract

PURPOSE:To surely separate scraps produced at the time of forming a work from a piercing punch and an oil breaker pin. CONSTITUTION:The oil breaker pin 23 is connected to a push pin 35 via a link member 33 and the movement of the push pin 35 is transmitted to the oil breaker pin 23 to operate this. In addition, the working speed of the oil breaker pin 23 is set faster than that of the piercing punch 15 and the pin 23 comes into contact with the scraps S simultaneously with forming completion of the work W. In addition, since both cam slides 49 approach and move to the oil breaker pin 23 from the sides when ratchet came 41 move above, even if the scraps S remain stuck to this pin 23, when the pin 23 further rises, the scraps S come into contact with the tips of the cam slides 49 and separate from the oil breaker pin 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press device for forming, and more particularly to a press device for reliably removing scraps generated in press forming from a forming member.

[0002]

2. Description of the Related Art In press forming, scrap is often produced by forming a work, and it is necessary to consider handling and processing of the produced scrap portion.

FIG. 9 is a front view showing a conventional pressing apparatus in which a circular hole is formed in a plate-shaped work. As shown in the figure, this pressing device has an upper holder 11 and a lower holder 13 which are relatively close to and away from each other. The pierce punch 15 is fitted to the upper holder 11, and the punch 15 is fitted to the lower holder 13. A button die 17 with possible holes is attached. Further, the button die 1 is provided on the upper holder 11.
Stripper 1 for holding and holding work W in cooperation with 7
9 is attached and is urged in the direction of approaching the button die 17. The stripper 19 is engaged with the stripper bolt 21 attached to the upper holder 11 and has a limited movement range. Further, the piercing punch 15 has a built-in oil breaker pin 23 that is biased toward the lower holder 13, and the tip of the pin 23 can be projected from an opening formed on the tip surface of the piercing punch 15. You can do it.

In order to form the work W with such a press device, first, the work W is placed on the button die 17,
After this, the upper holder 11 is moved toward the lower holder 13.
At the same time, the stripper 19 simultaneously moves close to the lower holder 13 and holds the work W under pressure in cooperation with the button die 17. When the upper holder 11 further moves downward, the tip of the oil breaker pin 23 protruding from the tip surface of the piercing punch 15 contacts the work W, and then the piercing punch 15 contacts. The piercing punch 15 moves further downward and forms the work W in cooperation with the button die 17. When scrap S occurs after molding, the tip of the oil breaker pin 23, which is simultaneously urged downward, protrudes from the tip surface of the piercing punch 15, and the scrap S enters the scrap hole 25 formed under the button die 17. Be dropped.

[0005]

However, processing oil is generally applied to the surface of the work W to improve the formability and an oil film is formed, so that the scrap S generated by the forming is pierce punched. It is easy to adhere to the tip surface of 15. Therefore, if the elastic force of the spring 27 that biases the oil breaker pin 23 downward is small,
As shown in FIG. 10A, the oil breaker pin 23 prevents the scrap S from being taken from the piercing punch 15. As described above, if the scrap S cannot be removed from the piercing punch 15, the scrap S shown in FIG.
As shown in (b), when machining the next work W,
Since the scrap S is present between the work W and the piercing punch 15, accurate molding cannot be performed.

On the other hand, if the elastic force of the spring 29 for urging the oil breaker pin 23 is relatively large, the scrap S
Can be separated from the piercing punch 15, but FIG.
As shown in 1, there is a possibility that the scrap S adheres to the oil breaker pin 23. When the scrap S closely attached to the oil breaker pin 23 is detached when the next work W is carried in, as shown in FIG. 12, it becomes an underlay of the work W or, conversely, on the work W. It falls. In this case, the work W cannot be accurately formed in any case. If the elastic force of the spring 29 that urges the oil breaker pin 23 is large, the workpiece W before forming is
As a result, the oil breaker pin 23 and the button die 17 deform, and as shown in FIG. 14, at the time of the start of molding, the oil is formed in the forming portion of the work W that is held by the button die 23 and the stripper 19 while being pressed. A bending moment is generated by the pressing force of the breaker pin 23. Since any of these causes a reduction in the forming accuracy of the work W, the spring 29 having a large elastic force cannot be used. Furthermore, if the device is used for a long period of time and the elastic force of the spring is reduced, the same problems as in the case of using a spring having a weak elastic force as described above will occur.

The present invention made in view of the above problems,
The purpose is to reliably remove scraps generated during work forming from piercing punches and oil breaker pins to prevent the occurrence of defective work.

[0008]

According to the present invention for achieving the above object, a concave die is attached to one of a pair of holders which are movable toward and away from each other, and the other die cooperates with the die. A punch for forming a work by the action, and a stripper that is capable of relatively approaching and separating from the die and holding the work by holding the work together with the die are attached, and an oil breaker pin that moves in and out from the tip surface of the punch is attached. A press device incorporated in the punch,
A guide space for dropping scraps generated when the work is formed by the cooperation of the die and the punch,
A slide member that is formed in the die and moves closer to and away from the movement axis of the oil breaker pin to move into and out of the space of the die is attached to the die, and when the pair of holders is moved away from each other, Slide member
In the pressing device, a moving member for advancing into the space and engaging with the scrap is attached to the other holder.

[0009]

When the pair of holders move closer to each other, the stripper moves closer to one of the holders, and cooperates with the die to hold the work placed on the die under pressure. The work held by the clamping force is pressed by the cooperation of the die and the punch. After that, the oil breaker pin is projected from the tip surface of the punch, and scrap generated by press working is separated from the punch. Subsequently, the slide member is moved close to the oil breaker pin to position the outer periphery of the punch in the cylindrical space defined by extending the punch in the advancing / retracting direction. By moving the slide member in this way, even if scrap is attached to the tip of the oil breaker pin that moves backward and returns to the inside of the punch, when the oil breaker pin moves backward, the slide member is scraped. The scrap can be reliably separated from the oil breaker pin and can be discarded. Further, since the oil breaker pin comes into contact with the scrap after the scrap is generated by the press working, the work is not pressed and deformed by the oil breaker pin before or at the start of the molding.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. In addition, the members common to the members already explained,
The same symbols are attached. As shown in FIGS. 1A and 1B, the lower holder 13 is formed with a button die 17 having a hole corresponding to the punched hole shape of the work W.
The lower holder 13 has a hole 25 communicating with this hole. On the other hand, above the lower holder 13, an upper holder 11 that is movable toward and away from the lower holder 13 is installed. The upper holder 11 has a button die 17 attached to the lower holder 13. A piercing punch 15 for removing a desired shape from the work W by the cooperation of the above is attached. Further, the upper holder 11 is provided with a stripper 19 which is biased by a spring 27 in a direction approaching the lower holder 13, that is, in the downward direction.
Before contacting with, the work W is preliminarily clamped and held around the work W in cooperation with the die 17. The stripper 19 is engaged with the stripper bolt 21 attached to the upper holder 11 and has a limited movement range.

On the other hand, as shown in FIG. 2, the upper holder 1
1 and the piercing punch 15 are provided with hollow through holes penetrating both members 11, 15, and an oil breaker pin 23 for separating scrap S generated by punching out a part of the work W from the piercing punch 15 is provided. It is slidably inserted. The oil breaker pin 23 is connected to one end of a link member 33 that is pivotally supported by a link support member 31 attached to the upper holder 11, and the other end of the link member 33 has a vertical position in the drawing. A pusher pin 35 extending in the direction and movable in the vertical direction is connected. Therefore, when the pusher pin 35 comes into contact with the push block member 37 attached to the lower holder 13, the oil breaker pin 23 moves downward in the figure via the link member 33. In the present embodiment, the downward moving speed of the oil breaker pin 23 is set to be twice the moving speed of the pierce punch 15, so that the position of the tip of the oil breaker pin 23 is processed. By making the tip of the piercing punch 15 project at the same time as the end, it is possible to prevent the oil breaker pin 23 from hitting the work W before processing, and prevent deterioration of processing accuracy. The pusher pin 35
Is urged downward by a spring 39, so that the oil breaker pin 23 moves upward and its tip is pierced by the piercing punch 1 when it is not in contact with the block member 37.
5 is located inside.

Further, as shown in FIG. 1B, a bracket 43 for swingably supporting a ratchet cam 41 as a moving member is attached to the upper holder 11. The bracket 43 has a cam stopper 4 as shown in the drawing.
5 is formed and contacts the ratchet cam 41,
The swing range is limited. Further, as shown in the figure, the ratchet cam 41 is engaged with the bracket 41 via a spring 47 and is urged in a direction of coming into contact with the cam stopper 45. Therefore, as shown in FIG. 3, when the ratchet cam 41 is not in contact with other members, the ratchet cam 41 is in contact with the cam stopper 45 and extends in the horizontal direction for positioning. The spring 47 may be removed if it is not necessary to attach it. The ratchet cam 41 slides a pair of slide members, that is, cam slides 49 slidably attached to the side portions of the button die 17, when the ratchet cam 41 moves downward and then rises. Both cam slides 49, which face each other with the central axis interposed therebetween, slide in directions relatively close to each other. As shown in the drawing, since both cam slides 49 are biased by springs 51 in the directions in which they separate from each other, they move in the directions in which they separate from each other when ratchet cam 41 is not in contact. Further, in the present embodiment, the ratchet cam 41 corresponds to each cam slide 49, but both cam slides may be operated by one ratchet cam using a link or the like.

Next, a procedure for forming a punched hole in the work by the pressing apparatus of this embodiment will be described. Note that the movements of the oil breaker pin 23 and the pusher pin 35 and the movements of the ratchet cam 41 and the cam slide 49 are shown in one figure.
Like this, the front view is arranged on the left side of the figure and the side view is arranged on the right side.

As shown in FIG. 4, when the stripper 19 and the button die 17 are separated from each other, the work W is first placed on the button die 17. In this state, the pusher pin 35 is separated from the pressing block member 37, and the tip of the oil breaker pin 23 is housed inside the piercing punch 15. The ratchet cam 41 and the cam slide 49 are separated from each other.
Next, when the upper holder 11 is gradually lowered and brought closer to the lower holder 13, the stripper 19 comes into contact with the work W placed on the button die 17 and holds the work W in a pinched state in cooperation with the button die 17. When the upper holder 11 is further lowered, the piercing punch 15 passes through the hole portion of the stripper 19 and advances to open a punched hole in the work W in cooperation with the button die 17, as shown in FIG. Also,
In this way, when the upper holder 11 is brought closer to the lower holder 13, the ratchet cam 41 contacts the cam slide 49, and the ratchet cam 41 swings as shown in the drawing. Therefore, at this time, the cam slide 4
9 does not move relative to each other. In this way, the upper holder 11 that has moved down to the lower holder 13 side moves up next. As shown in FIG. 6, when the upper holder starts to move upward, the ratchet cam 41 contacts the cam slide 49. At this time, the ratchet cam 41 stops the stopper 45.
, So that it cannot rotate in the clockwise direction in the figure. Therefore, the pair of cam slides 49 attached to the button die 17 move relatively relatively due to the contact 41 of the ratchet cam. Both cam slides 4
9 is an oil breaker pin 2 as shown in FIG.
It is designed to be close to each other with 3 interposed therebetween. Therefore, at this stage, even if the scrap S is still in close contact with the tip of the oil breaker pin 23, when the oil breaker pin 23 moves upward after that, the scrap S is caught at the tip of the cam slide 49, and the scrap S concerned. Can be reliably dropped. Then, when the upper holder 11 further rises, the ratchet cam 41 separates from the cam slide 49, and the pair of cam slides 49 are relatively separated by the spring 51. in this way,
Since the cam slide that drops the scrap is operated by the cam that moves together with the upper holder, the operation timing can be set easily and accurately. Note that, as shown in FIG. 8, the number of cam slides for surely removing scrap may be one.

[0015]

As described above, according to the present invention, scraps generated by work molding can be reliably taken out of the apparatus. Further, since the oil breaker pin is simply slidably passed through the punch, the strength of the punch and the oil breaker pin can be improved as compared with the conventional case. Since the oil breaker pin projects from the tip surface of the piercing punch after the molding is completed, the oil breaker pin does not come into contact with the work before processing to deform the work.

[Brief description of drawings]

FIG. 1A is a plan view showing the present embodiment, and FIG.
Is its front view,

FIG. 2 is a side view showing the present embodiment,

FIG. 3 is a front view showing the device of the present embodiment,

FIG. 4 is a side view showing an operating state,

FIG. 5 is a side view showing an operating state,

FIG. 6 is a side view showing an operating state,

FIG. 7 is an enlarged perspective view showing a tip end portion of a cam slide,

FIG. 8 is an enlarged perspective view showing a cam slide of another embodiment,

FIG. 9 is a front view showing a conventional device,

FIG. 10 is a front view showing a conventional device,

FIG. 11 is a front view showing a conventional device,

FIG. 12 is a front view showing a conventional device,

FIG. 13 is a front view showing a conventional device,

FIG. 14 is a front view showing a conventional device.

[Explanation of symbols]

15 ... Pierce punch 17 ... Button die 1
9 ... Stripper 21 ... Stripper bolt 23 ... Oil breaker pin 33 ... Link member 35 ... Push pin 3
7 ... Block member 41 ... Ratchet cam 45 ... Cam stopper 4
9 ... Cam slide

Claims (1)

[Claims] 1. A punch that mounts a concave die on one of a pair of holders that are movable toward and away from each other, and a punch that forms a work in cooperation with the die on the other holder, and a relative distance from and to the die. A pressing device which is free and which is attached with a stripper for holding and holding the work in cooperation with the die, and in which an oil breaker pin that comes in and goes out from the tip end surface of the punch is incorporated in the punch, the die and the die. A guide space for dropping scraps generated when forming the work by cooperation with the punch,
A slide member formed on the die and moved toward and away from the movement axis of the oil breaker pin to advance and retract in the space of the die is attached to the die, and when the pair of holders are moved away from each other, A pressing device, wherein a moving member for advancing a sliding member into the space to engage with the scrap is attached to the other holder.