JP3775252B2 - Compound press machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a composite press working apparatus that performs processing of an embossed portion that swells in a half-drawn state by a slit and pierced hole processing at a position close to the embossed portion in one step.
[0002]
[Prior art and problems to be solved by the invention]
For example, as shown in FIGS. 11A and 11B, a part of a work W1 represented by a panel-like mechanism part such as a bracket is provided with a long hole (pierce hole) H and its hole H. A pair of substantially rectangular embossed portions E and E may be formed on both sides of the plate. In addition, each embossed part E is in the form of a half-drawn state or an incompletely-drawn state so that it is offset about the plate thickness with respect to the base material by simultaneously forming a slit (cut) in a portion corresponding to the end surface e. Will bulge out.
[0003]
If such a hole H and a pair of embossed parts E, E are to be processed simultaneously by press working, the hole H is processed by shearing called so-called piercing, whereas the embossed parts E, E Since the processing is mainly overhang processing or drawing processing, the plastic flow of the material becomes unstable, and in particular, improvement in flatness accuracy at the peripheral portion Q (the hatched portion) of the hole H cannot be expected.
[0004]
Further, if the processing of the hole H and the processing of the embossed portions E and E are performed separately in two steps, the flatness accuracy in the peripheral portion Q of the hole H can be secured, but the center of the hole H and the embossed portions E, E, Since the center that bisects the facing interval between E does not coincide with each other, a shift is likely to occur between the two, and improvement in processing accuracy cannot be expected.
[0005]
The present invention has been made paying attention to such a conventional problem, and when it is necessary to form the embossed portion and the hole close to each other, while ensuring flatness accuracy and center position accuracy. An object of the present invention is to provide a composite press working apparatus that can be processed without difficulty in one process.
[0006]
[Means for Solving the Problems]
The invention according to claim 1 is a composite press working in which an embossed portion that swells in a panel-like workpiece in a half-cut state by a slit is formed, and a hole is punched and formed at a position close to the embossed portion. The device is arranged so that one die and the other die face each other with two approaching / separating operations to finish one machining, and one die has both a die hole for piercing hole machining and both An embossing part punch for bulging and forming the embossed part while forming a slit in cooperation with the embossing part processing die provided in the other mold during the first approaching and separating operation by the other molds is provided. In addition to the above-mentioned die for embossed portion processing, the die can be switched between a machining position and a retracted position, and is located at the machining position during the second approach / separation operation between both molds. In cooperation with the die hole of one of the mold-side in the state shall provide a pierce punch subjected to piercing hole processing. Further, the other mold is provided with a switching mechanism for switching the position of the piercing punch to the retracted position prior to processing of the embossed portion and to the processing position prior to processing of the pierced hole.
[0007]
In this case, as in the invention described in claim 2, both of the one mold and the other mold are slidable, and after one mold approaches the workpiece, the other mold It is desirable to move toward the workpiece and the workpiece.
[0008]
Therefore, according to the first and second aspects of the present invention, the embossing is performed by performing the first approaching / separating operation for one mold and the other mold after the position of the pierce punch is switched to the retracted position in advance. The embossed part is swelled together with the slit by the cooperation of the part processing punch and the embossed part processing die. Then, after the processing of the embossed part is completed, the position of the piercing punch is switched to the processing position, and then the second approaching and separating operation is performed for one mold and the other mold, thereby enabling the piercing punch and the piercing process. Piercing hole machining is performed in cooperation with the die hole. That is, since the embossed part and the pierced hole are sequentially processed with a predetermined time difference in one process, the flat accuracy of the peripheral part of the pierced hole can be maintained, as well as the relative positional accuracy of the pierced hole and the embossed part. It will be good.
[0009]
The invention described in claim 3 is based on the invention described in claim 1 or 2, and the workpiece is formed in advance as a substantially U-shaped cross section having a pair of side pieces facing each other. While this work is positioned so as to straddle one mold, a die hole for piercing and an embossing part punch are respectively disposed on both side surfaces of the one mold, The first and second other molds are opposed to each other across the one mold, and the processing of the one side piece portion by the one mold and the first other mold, The processing on the side piece on the opposite side by the second mold and the second mold is performed alternately.
[0010]
In this case, as in the invention described in claim 4, the processing of the embossed portion in the side piece portion on one side and the processing of the embossed portion in the side piece portion on the opposite side are alternately performed, It is desirable that the piercing hole processing in the side piece portion and the piercing hole processing in the opposite side piece portion are alternately performed.
[0011]
Further, the invention according to claim 5 is based on the premise of the invention according to any one of claims 1 to 4 that the embossed portions are simultaneously processed on both sides of the single pierced hole. It is a feature.
[0012]
Therefore, in the inventions according to the third and fourth aspects, with respect to a work having a substantially U-shaped cross section having a pair of side pieces facing each other, the processing of the pierced hole and the embossed portion with respect to one side piece, The piercing hole and the embossed part are all processed in one step.
[0013]
And even if it is a case where an embossed part is simultaneously processed on both sides of a single piercing hole as in the invention described in claim 5, it does not cause any increase in man-hours in the same process. Processing is performed.
[0014]
【The invention's effect】
According to the first aspect of the present invention, since the pierced hole and the embossed part are processed with a predetermined time difference in the same process, the flatness of the peripheral part of the pierced hole can be secured, and the pierced hole and the embossed part The relative position accuracy is also good, and the machining quality is greatly improved compared to the conventional one.
[0015]
Further, according to the invention described in claim 2, since both molds are slidable, both molds are completely separated from the workpiece when both molds are separated from each other. In addition to the same effect as that of the first aspect of the invention, there is an advantage that the workpiece can be taken out after processing very easily.
[0016]
According to the third and fourth aspects of the invention, with respect to a work having a substantially U-shaped cross section including a pair of side pieces facing each other, the processing of the piercing holes and the embossed portions in each side piece is one step. Therefore, in addition to the same effect as that of the first or second aspect of the invention, there is an advantage that the processing efficiency is further improved.
[0017]
According to the invention described in claim 5, since the pierced hole and the embossed portions on both sides thereof are processed simultaneously, the processing efficiency is further improved in the same manner as described above, and in particular, the center that bisects the opposing distance between the embossed portions, There is an advantage that the center of the pierced hole can be easily matched.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
1 and the following drawings show a preferred embodiment of the present invention. As shown in FIGS. 9 and 10, a mounting bracket W (hereinafter referred to as a workpiece) W fixed to a part of a vehicle suspension member M by welding. 11 shows an example of a composite press working apparatus in the case of forming a hole H and a pair of embossed portions E, E similar to FIG. This mounting bracket W has a substantially U-shaped cross section by connecting a pair of left and right side pieces R1, R2 with a central bridge B, and each side piece R1, R2 has an elongated hole shape. A pair of embossed portions E and E swelled in a half-drawn state or an incompletely-drawn state by the holes H and slits are formed.
[0019]
As shown in FIGS. 1 to 3, a center slide 2 corresponding to one mold is disposed on the base 1, and a pair of side slides corresponding to the other mold, that is, first and second slides are provided on both sides thereof. Side slides 3 and 4 are arranged to face each other. A guide groove 5 is formed in the base 1 along its longitudinal direction. Since both the center slide 2 and the side slides 3 and 4 are guided and supported by the guide groove 5, the center slide 2 The side slides 3 and 4 can be slid independently along the base 1.
[0020]
A frame-like case 6 is disposed so as to surround the center slide 2 and the pair of side slides 3 and 4. The case 6 is fixed to the center slide 2 with bolts 7 so as to slide along with the center slide 2. The first and second side slides 3 and 4 are individually provided with a hydraulic cylinder 8 or 9 as a slide drive source, and the piston rod 10 of each hydraulic cylinder 8 or 9 is connected to the case 6. Yes. Note that stoppers 11 or 12 are individually fixed to both ends of the base 1 to restrict the sliding stroke of the case 6 that slides together with the center slide 2.
[0021]
Embossed portion punches 14 each having a bulging portion 14a corresponding to the shape of the left and right embossed portions E, E in addition to the die hole 13 for piercing hole processing are individually fixed on both upper surfaces of the center slide 2. On the other hand, the left and right first and second side slides 3 and 4 are respectively provided with an embossing part processing die 15 and a piercing punch 16 so as to face the embossing part processing punch 14.
[0022]
4 and 5, the pierce punch 16 can be moved back and forth with respect to the holder 17, and a retreat position P1 (FIGS. 1 and 2) where the tip end surface thereof is flush with the embossing part processing die 15. ) And the processing position P2 (state shown in FIGS. 4 and 5) in which the tip surface protrudes by a predetermined amount from the embossing part processing die 15 can be switched. A backup key 19 that slides in response to the operation of the air cylinder 18 is provided in the holder 17, and when the backup key 19 is inserted into the back side of the pierce punch 16, the pierce punch 16 is moved to the processing position P2. On the other hand, when the backup key 19 is extracted from the back side of the pierce punch 16, the pierce punch 16 is held at the retracted position P1.
[0023]
As shown in FIG. 5, the pierce punch 16 and the backup key 19 are formed with inclined cam surfaces 16a and 19a that can be brought into sliding contact with each other, so that the backup key 19 can be easily inserted into the back side of the pierce punch 16. The backup key 19, the air cylinder 18 and the like constitute a switching mechanism 20 that switches the position of each pierce punch 16 between the machining position P2 and the retracted position P1.
[0024]
Therefore, according to the press working apparatus configured as described above, when the workpiece W is set, the center slide 2 is in the center position and the left and right side slides 3 and 4 are positioned as shown in FIGS. Waiting in the reverse limit position. In this state, the workpiece W shown in FIG. 10 is set, and positioning is performed using a positioning jig (not shown) so that the workpiece W straddles the upper portion of the center slide 2.
[0025]
At this time, the pierce punch 16 is held at the retracted position P <b> 1 so that the front end surface of each pierce punch 16 is flush with the embossing part processing die 15. Further, as shown in FIG. 10, the workpiece W is formed in advance in a separate process as a substantially U-shaped cross section, but the hole H and the embossed portions E and E are in an unprocessed state. Needless to say.
[0026]
When the workpiece W is set as described above, the hydraulic cylinder 8 on the first side slide 3 side first extends. Since the piston rod 10 of the hydraulic cylinder 8 is fixed to the case 6 fixed to the center slide 2, the center slide 2 is kept until the case 6 comes into contact with one stopper 11 as shown in FIG. And slide to the right. As a result, the embossing part punch 14 on one side of the center slide 2 comes into close contact with the inner side surface of one side piece part R1 of the workpiece W. At this time, no hydraulic pressure is introduced into the other hydraulic cylinder 9, and the other hydraulic cylinder 9 permits the sliding movement of the case 6 as described above.
[0027]
When the hydraulic cylinder 8 extends, the hydraulic cylinder 8 moves leftward toward the center slide 2 together with the first side slide 3 as shown in FIG. 7 in place of the case 6 already in contact with the stopper 11. One side piece R1 of the workpiece W is pressed and restrained between the center slide 2 and the center slide 2, and one embossed portion punch 14 and the embossed portion processing die 15 are subjected to shear bulging action. A pair of embossed portions E and E as shown in FIGS. That is, as shown in an enlarged view in FIG. 8A, when the embossing portion punch 14 and the embossing portion processing die 15 are engaged with each other, a slit is first formed at a position corresponding to the end surface e in FIG. The embossed portions E and E are swelled while being opened so that the slit is offset in the thickness direction with this slit. At this time, since the tip surface of the piercing punch 16 is flush with the embossing part processing die 15 as described above, the piercing punch 16 functions as a part of the embossing part processing die 15. Even so, the piercing punch 16 does not function at all.
[0028]
Thus, when the molding of the pair of embossed portions E, E is completed for one side piece R1, the center slide 2 and the first side slide 3 are separated from each other by the reverse operation of the hydraulic cylinder 8, and FIGS. Return to the original state shown in.
[0029]
Subsequently, the other hydraulic cylinder 9 is extended, and the center slide 2 slides to the left until the case 6 first comes into contact with the other stopper 12, so that the embossed portion of the center slide 2 is processed. The punch 14 is in close contact with the inner side surface of the other side piece R2. When the hydraulic cylinder 9 is extended, the hydraulic cylinder 9 and the second side slide 4 slide to the right instead of the center slide 2, and a pair of embosses are formed on the other side piece R2 in the same manner as described above. The parts E and E are bulged and formed. When the processing of the embossed portions E and E is completed, the hydraulic cylinder 9 returns to the original state shown in FIGS.
[0030]
Thus, when the processing of the embossed portions E and E for the left and right side piece portions R1 and R2 of the workpiece W is completed, the air cylinder 18 constituting the switching mechanism 20 is extended as shown in FIGS. In operation, the backup key 19 is inserted into the back side of each pierce punch 16. Thereby, the front end surface of each piercing punch 16 protrudes from the embossed part processing die 15 by a predetermined amount and is held at the processing position P2.
[0031]
When the switching operation of the pierce punch 16 is completed, the center slide 2 and the first side slide 3 are first moved closer to and away from each other on the basis of the expansion / contraction operation of one hydraulic cylinder 8 in exactly the same manner as the above-described embossed portion molding. Then, the center slide 2 and the second side slide 4 move toward and away from each other based on the expansion and contraction of the other hydraulic cylinder 9.
[0032]
At this time, as shown in FIG. 8B, a shearing action based on the engagement between the die hole 13 on the center slide 2 side and the pierce punch 16 on the first side slide 3 or the second side slide 4 side is performed. Therefore, as shown in FIGS. 10 and 11, a long hole-shaped pierce hole H is punched between a pair of embossed portions E and E that are bulged and formed on the side pieces R1 and R2 of the workpiece W. It will be molded.
[0033]
As described above, according to the present embodiment, the pair of embossed portions E and E that bulge so as to be offset in the half-cut state with the slit and the pierce hole H are formed with a time difference in the same process while being close to each other. Therefore, the relative positional accuracy between the embossed portions E and E and the pierced hole H is good, and in particular, the center that bisects the gap between the pair of embossed portions E and E and the center of the pierced hole H Can be easily matched, and the flatness accuracy of the peripheral portion Q (see FIG. 11) of the pierced hole H can be easily secured.
[Brief description of the drawings]
FIG. 1 is an explanatory front view showing a preferred embodiment of a composite press working apparatus according to the present invention.
FIG. 2 is an explanatory plan view of FIG. 1;
FIG. 3 is an explanatory diagram on the right side of FIG. 1;
FIG. 4 is an enlarged explanatory view of a main part of FIG.
FIG. 5 is an enlarged explanatory view of a main part of FIG.
6 is an operation explanatory diagram when the center slide of FIG. 1 is operated.
FIG. 7 is an operation explanatory diagram when the first side slide operation of FIG. 1 is performed;
8A is a horizontal cross-sectional view showing details of the embossed portion processing state of FIG. 7, and FIG. 8B is a horizontal cross-sectional view showing a processing state of the pierced hole.
FIG. 9 is a perspective view showing an example of a vehicle suspension member.
10 is an enlarged perspective view of a mounting bracket that is a suspension member component of FIG. 9;
FIG. 11A is an enlarged view of a main part showing an example of a conventional part in which a pierced hole and a pair of embossed portions are arranged side by side, and FIG. Figure.
[Explanation of symbols]
2 ... Center slide (one type)
3 ... 1st side slide (the other type)
4. Second side slide (the other type)
8, 9 ... Hydraulic cylinder 13 ... Die hole 14 for piercing hole machining ... Embossing part machining punch 15 ... Embossing part machining die 16 ... Piercing punch 18 ... Air cylinder 19 ... Backup key 20 ... Switching mechanism E ... Embossing part H ... Hole (Pierce hole)
P1 ... retracted position P2 ... machining position R1, R2 ... side piece W ... mounting bracket (workpiece)

Claims (5)

It is a composite press working device that molds an embossed part that swells in a panel-like workpiece with a half-cut state by a slit, and punches a hole at a position close to the embossed part,
One mold and the other mold are arranged to face each other so as to finish one process with two approaching and separating operations,
In one die, in addition to the die hole for piercing hole processing, embossing while forming slits in cooperation with the embossing part processing die provided in the other die during the first approach and separation operation of both dies While the embossing part punch for forming the part is provided on the other side, the other die can be switched between a processing position and a retracted position in addition to the above-mentioned embossing part processing die. A piercing punch that performs piercing drilling in cooperation with the die hole on one mold side in the state of the processing position at the time of the second approaching and separating operation by the molds of
Further, the other mold is provided with a switching mechanism for switching the position of the piercing punch to the retracted position prior to the embossing processing and to the processing position prior to the piercing hole processing. Press processing equipment. Both the one mold and the other mold are slidable, and after one mold approaches the workpiece, the other mold approaches the one mold and the workpiece. The composite press working apparatus according to claim 1, wherein: While the workpiece is formed in advance as a substantially U-shaped cross section with a pair of side pieces facing each other, the workpiece is positioned so as to straddle one mold,
A die hole for piercing and an embossing punch for punching are respectively disposed on both side surfaces of the one mold, and the first and second molds are disposed on both sides of the mold. Are opposed to each other,
Processing on one side piece by one mold and the first other mold and processing on the opposite side piece by one mold and the second other mold are alternately performed. The composite press working apparatus according to claim 1, wherein the composite press working apparatus is configured. The processing of the embossed portion in the side piece on one side and the processing of the embossed portion in the side piece on the opposite side are alternately performed, and then the pierced hole processing in the side piece on the one side is performed. The combined press working apparatus according to claim 3, wherein the piercing hole processing is alternately performed. The composite press working apparatus according to any one of claims 1 to 4, wherein embossed portions are simultaneously processed on both sides of a single pierced hole.

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