JPH06154903A - Piercing machine - Google Patents

Abstract

PURPOSE:To provide the piercing machine capable of sufficiently increasing the width of a lifter and easily and surely holding the side of a work without deforming or destroying a cam slide and a gib plate. CONSTITUTION:A die 15 and a stripper 17 are fitted on a lower holder 11 and an upper holder 13, respectively and the work W is held by moving the stripper 17 close to the die 15. In addition, a piercing punch 29 is fitted on the lower holder 11 and piercing is formed on the work W in cooperation with the die 15. At this time, rotational force generated on the cam slide 27 is reduced remarkably and the deformation damage of respective members 27 and 33 can be prevented by sliding and bringing the cam slide 27 fitted freely slidably on the lower holder 11 to support the piercing punch 29 into contact with the stripper 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressing machine, and more particularly to a shearing machine including piercing.

[0002]

2. Description of the Related Art It is a common practice to perform piercing and the like on a work that has been pressed and the like, and it is possible to perform processing at various positions. The conventional piercing apparatus shown in FIG. 7 has upper and lower holders 11, 1
3 is a piercing device having a punch having a working direction perpendicular to the relative approaching / separating direction of 3. As shown in the figure, this piercing apparatus has upper and lower holders 11 and 13 that are opposed to each other and move toward and away from each other, of which a lower holder 11 has a die 15 and an upper holder 13 has a stripper 17. Is attached. Therefore, when the upper and lower holders 11 and 13 are brought close to each other, as shown in FIG.
A work W, which is a work piece, includes a die 15 and a stripper 17.
Held by and. It should be noted that, as in the present device, the tip end portion 19 of the stripper 17 may be brought into contact with the distance piece 21 attached to the lower holder 11 to improve the work holding force in the direction perpendicular to the approaching / separating movement direction. it can.

After holding the work W, both holders 11, 1
When 3 relatively moves closer, the elastic force of the spring 23 installed between the upper holder 13 and the stripper 17 increases, so that the holding force for holding the side portion of the work W further improves. When both holders 11 and 13 are relatively close to each other,
As shown in the figure, the cam slide 27 that is in sliding contact with the cam driver 25 attached to the upper holder 13 is
It is moved close to the work W. A piercing punch 29 is attached to the cam slide 27. By bringing the cam slide 27 close to the work W, the piercing work 29 can be pierced by the cooperation of the piercing punch 29 and the die 15. As shown in the drawing, the cam slide 27 is provided with engaging portions 3 formed on both sides of the lower end portion.
1 is slidably engaged with a gib plate 33 that is installed so as to extend in a direction in which it approaches and separates from the work W, and moves back and forth with respect to the work W along the longitudinal direction of the gib plate 33. It is like this. Further, lifters 35 capable of separating the work W from the die 15 in the upward direction are installed on both sides of the die 15.

[0004]

However, as shown in FIG. 9, when a load is applied to the pierce punch 29 attached to the upper portion of the cam slide 27, a rotational force with the front end S of the cam slide as a fulcrum is generated. This may occur, and a force may be applied to a portion Q where the engaging portion 31 of the cam slide 27 and the give plate 33 come into contact with each other, and the portion may be deformed or damaged. For example, in the case of piercing, when the cam driver 25 moves the cam slide 27 forward, the arrow R appears at the sliding contact portion between the cam driver 25 and the cam slide 27.
The load indicated by is applied to the cam slide 27, and a rotational force with the front end portion S of the cam slide 27 as a fulcrum is generated.
Therefore, as shown in FIG. 10, an upward force indicated by an arrow F ₀ is applied to the contact portion Q of the rear end of the cam slide with the give plate, and the cam slide 27 and the give plate 33 are deformed, It will be damaged. The force F applied to the contact portion Q is expressed by the formula F = R × H / B. Here, H is the distance between the mounting position of the pierce punch and the front end S of the cam slide, and L is the distance between the front end S and the contact portion Q, that is, the length of the cam slide.

Therefore, when the cam slide length L cannot be sufficiently obtained due to restrictions such as the installation position of the transfer bar, such as an assembly line of the type in which the work is transferred by the transfer bar, as can be understood from the above equation, The upward force F becomes relatively large, which tends to cause a problem regarding deformation or breakage of the cam slide 27.

Since the front end S of the cam slide 27 is a fulcrum when the load R is applied, it must be kept in contact with the lower holder 11 as shown in FIG. However, the front end portion S of the cam slide 27 is
When the lower holder 11 is brought into contact with the lower holder 11, the width B of the lifter 35 for raising and lowering the work W cannot be increased, so that the lifter 35 cannot have sufficient strength. Lightly
If the front end portion S of the cam slide 27 is moved away from the lifter in order to secure a sufficient lifter width B, the weight applied to the piercing punch 29 described above cannot be sufficiently received.

Further, as shown in FIG. 8, in this piercing apparatus, the projecting end portion 19 of the stripper 17 is biased downward by a spring 23 installed between the upper holder 13 and the stripper 17, Distance piece 21
The side portion of the work W to be pierced is securely held by abutting against. However, since the spring 23 urges the stripper 17 downward to hold the work, a spring having a large spring constant must be used to sufficiently hold the work. Further, since the spring constant, that is, the resilience, of the spring changes during long-term use, it has to be replaced periodically at a relatively short cycle.

According to the present invention made in view of the above problems, the width of the lifter can be made sufficiently large without deforming or destroying the cam slide or the gib plate, and the side portion of the work can be easily performed. An object of the present invention is to provide a piercing device that can be surely held.

[0009]

SUMMARY OF THE INVENTION To achieve the above object, the present invention provides a pair of holders that can be relatively moved toward and away from each other.
A die attached to one holder of the pair of holders, a stripper attached to the other holder of the pair of holders to hold a work by cooperation with the die, the die and the stripper. The cam slide that moves back and forth with respect to the work held by the die and the stripper as the and relatively move away from each other, and is installed along the moving direction of the cam slide. A piercing device having a set of gib plates with which the engaging portions formed on both sides are slidably engaged, and a punch attached to the cam slide and performing a piercing process in cooperation with the die. In the cam slide, a slide surface adjacent to the central axis of the punch and extending in the advancing / retreating movement direction is formed, and A piercing apparatus characterized by forming a slidable stripper slide surface on the slide surface.

[0010]

[Function] The work is held by moving the die and the stripper relatively close to each other. In this state, when the cam slide is moved forward toward the work, the punch attached to the cam slide also approaches the work. Therefore, when the punch approaches further, the work is pierced by cooperation with the die. During piercing, the slide surface formed on the cam slide and the stripper slide surface formed on the stripper are in slidable contact, and the force that moves the cam slide forward causes the cam slide surface to move. Rotational force is generated with the sliding contact portion with the stripper sliding surface as the fulcrum. Therefore, the rotating force applied to the cam slide is significantly smaller than in the conventional case where the contact portion between the cam slide and the lower holder is the fulcrum of the rotating force.
At the same time, the load carried by the lower end of the cam slide is significantly reduced, and the force applied to the gib plate is greatly reduced, so that the gib plate can be prevented from being deformed or destroyed.

[0011]

Next, an embodiment of the present invention will be described with reference to the drawings. The same members as those already described are designated by the same reference numerals. FIG. 1B is a front view showing the piercing device of the present embodiment, and FIG.
It is an arrow line view of the arrow A direction shown by (b). In addition, the apparatus of the present embodiment, as shown in FIG.
Although the piercings can be formed on all sides of the work W, in the drawings including FIG. 1B, only the portion forming one piercing is shown for simplicity.

As shown in FIG. 1B, the piercing apparatus of this embodiment includes a lower holder 11 and the lower holder 11.
And an upper holder 13 which can be moved up and down in the vertical direction. Of these, the lower holder 11 is attached with a die 15 which is one of the piercing-type molds performed on the placed work W. On the side of the die 15, the die 1
A lifter 35 that slidably moves up and down the side portion of 5 is mounted. The work W is placed on the lifter 35 in the most raised state, and the lifter 35 is moved down to place the work W on the die 15. It can be placed. Also,
As shown in FIG. 1B, a piercing die 45 is formed on the side portion of the die 15 and communicates with a hollow portion 47 formed inside.

As shown in FIG. 2A, the piercing die 45 cooperates with the piercing punch 29 attached to the cam slide 27 to pierce the work W. As shown in the figure, the cam slide 27 to which the piercing punch 29 is attached has engaging protrusions 31 on both sides of the lower end, and both engaging protrusions 31 are attached to the lower holder 11 by the die 15. Set of gib plates 3 extending in a direction toward and away from each other
3 is slidably engaged. Therefore, when the cam slide 27 is moved forward along the give plate 33 in the direction close to the die 15, the piercing punch 29 moves close to the die 15 and cooperates with the piercing die 45 to pierce the work W. To do. A slide surface 51 extending in the forward / backward movement direction is formed on the upper portion of the cam slide 27, and the upper surface of the projecting end portion 19 of the stripper 17 shown in FIG. 3, that is, the stripper slide surface 53 is slidable during piercing. It comes in contact with. Further, the outer diameter of the projecting end portion 19 of the stripper is determined so that the slide surface 51 can be brought into sliding contact immediately before the piercing punch 29 comes into contact with the work W.

On the other hand, a stripper ring 61 is attached to the upper holder 13 as shown in FIG. 1 (b), and when the upper and lower holders 11 and 13 are separated from each other, the upper holder 13 faces downward. The stripper 17 that is biased and attached is engaged. A pad 63, which is also biased downward with respect to the upper holder 13, is engaged with the stripper 17 so as to be vertically movable. Therefore, as shown in FIG.
Is moved closer to the lower holder 11, so that the stripper 17 and the pad 63 cooperate with the die 15.
The work W placed on the die 15 can be held under pressure. As described above, the stripper 17 cooperates with the die 15 to hold the side portion of the work W by the stripper tip 65.
The tip end portion 65 has a protruding end portion 19 extending in the forward / backward movement direction of the cam slide 27. As shown in FIG. 2 (a), the projecting end portion 19 holds the work W while holding it, and at the same time, contacts the distance piece 21 attached to the lower holder 11, and the stripper slide surface. 53 is a slide surface 51 formed on the cam slide 27 during piercing.
And slidably contact. Therefore, as shown in the drawing, during the piercing process, the stripper 1
7 to the slide surface 51 of the cam slide 27.
Since the pressing force can be held by the distance piece 21 and the distance piece 21, the work W can be surely held by the stripper 17,
More accurate processing can be performed. Further, since it is not necessary to press the stripper 17 against the distance piece 21 by using the spring 23, the spring 23 that biases the stripper 17 downward is a spring having a relatively weak elastic force that can prevent so-called work dance. Good.

A cam driver 25 having an inclined cam drive surface 67 is attached to the upper holder 13, and as shown in FIG.
When the cam 13 approaches, the cam drive surface 67 makes sliding contact with the inclined surface 69 formed on the cam slide 27 and moves the cam slide 27 forward in the direction approaching the die 15. . Therefore, by moving the upper holder 13 downward, the cam slide 27
Can be moved forward, the piercing punch 29 can be brought close to the die 15, and the work W can be pierced. Next, a procedure for piercing a work with the piercing device of the embodiment will be described. When the work W is loaded into the piercing device with the upper and lower holders relatively separated from each other, the work W is placed on the lifter 35 that has been raised to the highest position. When the work W is placed, the lifter 35 moves down and the work W is moved to the die 1 as shown in FIG.
5 is placed. After that, the lifter 35 further descends and fits in the holder accommodating portion 71 formed in the lower holder 11.

When the work W is placed on the die 15, the upper holder 13 moves downward toward the lower holder 11. Along with this, the stripper 17 and the pad 63 attached to the upper holder 13 move downward, and hold the work W by clamping in cooperation with the die 15. Stripper 1
When the work piece W is held by the stripper 17, the projecting end portion 19 of 7 comes into contact with the distance piece 21 at the same time. Further, when the upper holder 13 moves down, the attached cam driver 25 also moves down to bring the drive surface 67 of the cam driver 25 into sliding contact with the inclined surface 69 of the cam slide 27 installed in the lower holder 11. , The cam slide 27 is moved forward. Therefore, when the upper holder 13 moves downward, the cam slide 27 moves forward toward the die 15, and at the same time, the piercing punch 29 also moves forward toward the die 15.

When the piercing punch 29 moves further forward, and immediately before the tip of the piercing punch 29 comes into contact with the work W, as shown in FIG. 2A, as shown in FIG. The stripper slide surface 53 begins to slidably contact the slide surface 51. In this way, when the stripper slide surface 53 makes sliding contact with the slide surface 51 of the cam slide 27, the front end portion S of the cam slide 27 is separated from the lower holder 11 by the distance C, as shown in FIG. The clearance C is usually about 0.02 mm, and the dimensional relationship of the illustrated members is T ₁ −t ₁ = (t ₂ −T ₂ ) + C (however, T ₁ −t ₁ ).
-T ₁ is approximately 0.02 mm). Therefore, the downward force applied to the die 15 side of the cam slide 27 can be received by the stripper slide surface 53, and the arrow R
The fulcrum of the rotational force generated inside the cam by the pressing force indicated by moves from the front end portion S to the slide surface end point P. That is, as shown in FIG. 6, the distance H from the attachment position of the piercing punch 29 to which the pressing force R is applied to the fulcrum is from H ₀ to H.
Significantly reduced to ₁ . Therefore, F = R × H /
An upward force F generated at a contact point Q between the rear end portion of the engagement portion 31 of the cam slide and the give plate 33, which is represented by L.
₁ is much smaller than that before the stripper sliding surface 53 slides on the sliding surface 51.

When the cam slide 27 further moves forward while sliding the slide surface 51 on the stripper slide surface 53, the piercing punch 29 comes into contact with the work W and the piercing is performed in cooperation with the die 15. As described above, since the fulcrum of the rotational force generated by the pressing force R has already moved to the slide surface end point P, the force F ₁ proportional to the distance from the mounting position of the pierce punch to the fulcrum is the conventional F _0. Significantly smaller than. Further, as can be seen from the above formula, this force F ₁ is inversely proportional to the length L of the cam slide, and in a device of a type that cannot sufficiently increase the length L of the cam slide, such as a transfer bar type device, Although the force F becomes particularly large and becomes a problem, as described above, in the piercing apparatus of the present embodiment, the distance H from the attachment position of the piercing punch 29 to the fulcrum is greatly reduced, so that the cam. The force F can be reduced even with a device of a type in which the length L of the slide cannot be sufficiently obtained.
By reducing the force F in this way, it is possible to prevent the contact point Q between the rear end of the engagement portion 31 of the cam slide 27 and the gib plate 33 from being deformed or damaged. In addition, it goes without saying that it also serves to prevent deformation and damage of parts other than this contact point.

As shown in FIGS. 2 (a) and 2 (b), when the viewpoint is changed, the stripper tip portion 19 includes the distance piece 21 and the slide surface 5 of the cam slide 27.
By means of No. 1 and No. 1, the work piece W is held with a pinching force, and the work W is surely held without shifting during the piercing process. Therefore, as compared with the case where the stripper 17 is held by using the elastic force of the spring 23 that urges downward, the stripper 17 can be held more reliably. Further, the elastic force of the spring 23 for urging the stripper 17 downward is improved by a weak elastic force that prevents so-called work dance.

Further, since the fulcrum of the rotational force is moved from the front end portion S of the cam slide to the end point P of the slide surface 51, a large load is not applied to the front end portion S. ), The accommodation portion of the lifter 35 can be enlarged, and the strength of the lifter 35 can be increased. As can be seen from the series of operations, the lifting and lowering of the work W and the piercing process are not performed at the same time, so that the lifter 35 and the cam slide 27 do not interfere with each other.

As shown in FIG. 2B, when the piercing punch 29 further moves forward, the piercing is formed on the work W in cooperation with the die 15. The waste material generated by the piercing process is discharged to the outside of the device through the hollow portion 47 formed inside the die 15. When the pierce is formed on the work W, the upper holder 13 moves upward. Since the cam slide 27 is biased by the spring 73 in a direction to move backward, the cam slide 27 moves backward as the upper holder 13 rises and the cam drive 25 rises. Upper holder 13
When is separated from the lower holder 11 sufficiently, the lifter 35 moves upward to raise the work W, and the work W is discharged from the piercing device. Work pieces are sequentially processed by repeating such operations.

The apparatus of this embodiment is not limited to this embodiment, but can be variously modified without departing from the spirit of the present invention. For example, both the drive surface and the slide surface do not have to be flat and can have various shapes.

[0023]

As described above, according to the present invention, during the piercing process, the slide surface formed on the cam slide,
The stripper slide surface formed on the stripper is
It is in slidable contact, and the force that moves the cam slide forward makes the sliding contact part of the cam sliding surface with the stripper sliding surface the fulcrum, so the contact part between the cam slide and the lower holder rotates. Compared with the conventional method, which was a fulcrum of force, the rotational force generated is significantly reduced. At the same time, the load carried by the lower end of the cam slide is significantly reduced, and the force applied to the gib plate is greatly reduced, so that the gib plate can be prevented from being deformed or destroyed.

[Brief description of drawings]

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

2A and 2B are side sectional views showing the present embodiment,

FIG. 3 is an enlarged perspective view showing a part of the stripper,

FIG. 4 is a partially enlarged view showing a contact portion between a stripper and a cam slide,

FIG. 5 is a conceptual diagram showing the movement of a cam slide,

FIG. 6 is a partially enlarged view showing the device of the present embodiment,

FIG. 7 is a side sectional view showing a conventional device,

FIG. 8 is a side sectional view showing a conventional device,

FIG. 9 is a partially enlarged view showing a conventional device,

FIG. 10 is a side view showing a cam slide.

[Explanation of symbols]

11 ... Lower holder 13 ... Upper holder 1
5 ... Die 17 ... Stripper 25 ... Cam drive 2
7 ... Cam slide 29 ... Piercing punch 33 ... Give plate 3
5 ... Lifter 45 ... Piercing die 51 ... Slide surface 53 ... Stripper slide surface

Claims (1)

[Claims] 1. A pair of holders that can be relatively moved toward and away from each other, a die attached to one of the pair of holders, and a die attached to the other holder of the pair of holders. A stripper for holding a work by the cooperation of a die, a cam slide that moves back and forth with respect to the work held by the die and the stripper as the die and the stripper move toward and away from each other, and the cam slide. A set of gib plates, which are installed along the moving direction of the cam slide, and in which the engaging portions formed on both sides of the lower end of the cam slide are slidably engaged, and the die attached to the cam slide. A piercing device that performs piercing by cooperating with the punch, and the cam slide is adjacent to the central axis of the punch and is reciprocated. Forming a slide surface extending in moving direction, the stripper, piercing apparatus characterized by forming a slidable stripper slide surface on the slide surface.