JPH0890300A - Press forming device - Google Patents

Abstract

PURPOSE: To enable the use of many small forming dies by providing a work space changing means by which a work space is changed in accordance with the work forming space required by the forming die of the next process in the middle of many processes. CONSTITUTION: Two pieces of work W, W are worked side by side. In a flange forming process Sf, a work W is worked with a space between both works W, W maintained at a normal space P1. In the next process, a cam forming process Sc, since a larger space is required between both works W, W, working is performed with that space widened to P2 by a work space changing means. Without the change of the work space, an entire process need to be performed with a wide space, requiring a large-sized forming dies. Additionally, wastes between works will be increased in a blank, increasing loss in materials. Thus, such absurdity may be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press forming apparatus for forming a plurality of workpieces by a forming die in each step while simultaneously conveying the steps among multiple steps.

[0002]

2. Description of the Related Art Conventionally, as a press forming apparatus for sequentially forming a work by a forming die over multiple steps, as shown in, for example, Japanese Utility Model Laid-Open No. 3-116228, it extends in the work conveying direction and is lifted by a hanging member. A feed member that holds the work in each process is attached to the possible lift member so as to be movable in the work movement direction, and the work is carried in each process while being conveyed between each process by the lifting member lifting and moving the feed member. It is known to perform such drawing forming.

In addition, as disclosed in Japanese Utility Model Laid-Open No. 2-114120, a hemming punch for hemming a side edge of a work by bending the side edge of a work is supported swingably on the side of a lower die as a forming die. A cam forming method has been proposed in which a hemming punch is rotated by a cam mechanism in accordance with the lowering movement of an upper die to hemm a side edge of a work.

[0004]

By the way, in a press forming apparatus for sequentially forming a work by a forming die in each step while transporting the work among many steps as in the above-mentioned conventional example, a large number of works are taken from a blank. In this case, in a predetermined process, the side edges of the work may be cam-formed from the side of the adjacent work side as in the above-mentioned proposed example.

At this time, in order to arrange the cam mechanism for cam forming and the like, it is necessary to widen the space between the works in this step as an arrangement space for the cam mechanism and the like. For this reason, it is necessary to set the work intervals in other processes in accordance with the work intervals in this process, which requires a large molding die to increase the cost of the mold, or between blanks. There are problems such as a large amount of waste and a large material loss.

The present invention has been made in view of the above points, and an object of the present invention is, in the case where a large number of workpieces, as described above, are conveyed while being sequentially molded in a plurality of steps, the conveying mode of the workpieces. By improving the above, the gap between the works is increased only in the process where the space between the works needs to be widened in order to perform the cam forming, etc., and the work can be formed at the small intervals in other processes. ,
It is an attempt to reduce the cost by using a small molding die as a whole and to reduce the loss of the material of the work.

[0007]

In order to achieve the above-mentioned object, in the invention of claim 1, before the step of changing the interval between the workpieces to be taken in large numbers, the workpiece by the forming die in the step is changed. The interval between the works was changed according to the molding interval of.

More specifically, the present invention is premised on a press forming apparatus in which a plurality of workpieces are simultaneously formed in a plurality of steps by a conveying means while being conveyed by a conveying means between the steps. is there.

Work interval changing means for changing the interval between the works according to the forming intervals of the works by the forming dies in the next process is provided in the middle of the multiple processes.

According to a second aspect of the present invention, the work interval changing means is arranged so as to be capable of moving up and down in a forming die in a predetermined step among a plurality of steps, and when raising, the work lifter separates and raises each work from the forming die. Then, move this work lifter horizontally in a horizontal direction so that the space between it and other work lifters increases as it rises, and at the rising end position of the work lifter, adjust the space between the work and other work to the work in the molding die of the next process. And a lift mechanism that drives the work lifter so as to raise the work lifter after the work is molded by the molding die.

According to a third aspect of the present invention, the carrying means has a work holding section for holding the works on the work lifters and carrying them to the next process when the work lifters in the work interval changing means are at the rising end position. And

According to another aspect of the present invention, the cam mechanism comprises a pair of guide members provided on the lower surface of the work lifter and having a cam portion that is inclined upward in a direction in which the distance to another work lifter increases. , A pair of engaging portions which are provided on the fixed body of the molding die and which respectively engage with the cam portions of the guide member.

On the other hand, the lift means is a cylinder having a body portion swingably supported by the fixed body and a piston rod having a tip end portion connected to a work lifter between the pair of guide members. The engaging portion engages with the lower end of the cam portion of each guide member before reaching the extension side stroke end.

[0014]

With the above construction, in the invention of claim 1, a plurality of workpieces are formed by the forming die in each step while being conveyed by the conveying means between the steps over many steps. In the middle of this multi-step, the interval between the works is changed by the work interval changing means according to the forming interval of the work by the forming die in the subsequent step. Therefore, in a normal process, the work is formed with a small space between the works, and in a process in which the space between the works needs to be changed to perform cam forming or the like, before the work, the work space changing means is used to change the space between the works. The interval may be changed according to the next process, and therefore, a small molding die having a small interval between works can be used as a whole, and the cost thereof can be reduced.

In addition, since the interval between the works is changed in the course of the multi-steps as described above, when a large number of works are to be taken from the blank, the intervals between the works are kept small according to the intervals in the first step. The material loss of the work can be reduced.

According to the second aspect of the present invention, when the work distance is changed by the work distance changing means in a predetermined process, the lift means is actuated and the work lifter is lifted after the work is formed by the forming die in that step. Then, the work is separated from the forming die and rises due to the rise of the lifter. At the same time, the work lifter is moved horizontally in the horizontal direction by the cam mechanism according to its rise, which separates the work lifter from other work lifters and widens the space between the works, and the work lifter moves to the rising end position. The distance from another work corresponds to the molding distance of the work in the molding die of the next step. In this way, since the work interval is enlarged and changed to the target interval after the work is formed by the forming die in the predetermined process, it is possible to easily change the work interval.

According to the third aspect of the present invention, when the work lifter in the work interval changing means is raised to the rising end position, the works on the work lifter are held by the work holding portions of the carrying means and are carried to the next step. Therefore, the interval between the work holding portions of the transfer means may remain fixed according to the molding interval of the work in the next step, and it is not necessary to change the interval during the transfer, and the structure of the transfer means and its control Can be simplified.

In a fourth aspect of the invention, when the cylinder as the lift means extends, the piston rod extends from the body portion swingably supported by the fixed body, and the work lifter connected to the tip of the piston rod moves. Ascending, the work is separated from the mold and lifted as described above. Further, the pair of guide members projecting from the lower surface of the work lifter move inside the cam portions while the engaging portions on the fixed body side are guided. Since the cam portion is inclined upward in the direction in which the distance to other work lifters increases, the guide member and the work lifter move upward as the guide portion and the work lifter move upward due to the engagement guide of the engagement portion of the cam portion. When the work lifter reaches the rising end position, the distance between the works is expanded to a predetermined distance by horizontally moving the work lifter in a direction in which the distance from the work lifter increases.

The tip of the piston rod of the cylinder is connected to the work lifter between the pair of guide members, and the engaging portion engages with the lower end of the cam portion of each guide member before the cylinder reaches the extension side stroke end. Therefore, when the work lifter is at the rising end position, the engaging portion on the fixed body side is pressed and locked to the lower end of the cam portion of each guide member, and is positioned higher than that between the two locking portions. When the lifter is pushed up by the cylinder, the work lifter is supported by the fixed body at three points: the engaging portion with the lower end of both cam portions and the connecting point with the piston rod of the cylinder. Therefore, the work lifter can be stably held at the rising end position.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 6 shows a work forming line L according to an embodiment of the present invention.
In this line L, two workpieces W, which are vehicle body panel parts of an automobile, are taken from a blank (not shown), and then these two workpieces W, W are arranged in the left-right direction orthogonal to the direction along the line L. In parallel with each other, the molding process is carried out in each process while simultaneously carrying over a plurality of processes. In FIG. 6, Sf is a flange forming step, and Sc is a cam forming step following the flange forming step Sf.

A publicly known press molding apparatus 1 for simultaneously molding the works W, W is installed in each of the above steps. The respective press-molding apparatuses 1 have basically the same structure. For example, as an example of the press-molding apparatus 1 in the flange molding step Sf, as shown in FIGS. 3 and 4,
The press molding apparatus 1 has a left and right molding die 2 which is provided corresponding to each work W and operates in synchronization. The molding die 2 includes a pedestal 3 (bolster) installed on the floor surface, left and right lower dies 4 and 4 mounted on the pedestal 3 and having a molding surface 4a at the upper end, and the lower dies. It is arranged above the mold 4 so that it can move up and down so as to come in contact with and separate from the lower mold 4,
The left and right upper molds 5 and 5 (only the right side is shown) having a molding surface 5a at the lower end are provided, and a lifting drive mechanism (not shown) for driving the upper molds 5 up and down is provided. Then, after each upper die 5 is raised by the elevating drive mechanism and each work W is placed on the lower die 4, the upper die 5 is moved downward to move the forming surface 5a and the forming surface 4a of the lower die 4. The work W is formed in the interval. In the forming die 2 of the flange forming step Sf, the side edge of the work W is bent downward on the lower die 4 by the upper die 5 at a substantially right angle to form the flange W1, as shown in FIG.

Between the adjacent steps, the work W is provided between the steps.
A transport device 7 for transporting is installed. The transfer device 6 includes a shuttle feeder 7 having a work receiving portion 7a that positions and places a work W and reciprocates back and forth between the processes in the line direction, and a lower part of each of the forming dies 2 of the press forming device 1 in the previous process. The workpiece W after forming is taken out from the die 4 and the workpiece receiving portion 7 at the backward end position of the shuttle feeder 7
and an unloader 8 that is transferred onto the a and a loader that picks up the work W from the work receiving portion 7a at the forward end position of the shuttle feeder 7 and sets it on each lower die 4 of the forming die 2 of the press forming apparatus 1 in the subsequent step. 9 and 9. The unloader 8 and the loader 9 each have the same structure, and a main body 10 movably suspended and supported by a guide rail 10a extending along the line L above the steps, and the main body 10
A pair of left and right arms 11 and 11 (only one is shown) vertically movably and vertically movably attached to each arm 1.
1 and a hand 12 attached to the tip of each press W for sucking and holding each work W, and each work W formed in the previous step is placed on the lower die 4 of the press forming apparatus 1 (described later in the flange forming step Sf). As described above, the work 12 is adsorbed by the hand 12 of the unloader 8 and picked up and transferred onto the work receiving portion 7a at the backward end position of the shuttle feeder 7, and the work receiving portion 7a of this shuttle feeder 7 is moved forward to move the work. The work W is received at the forward end position by the work receiving portion 7a
Is picked up by the hand 12 of the loader 9 and set on the lower mold 4 of the press molding apparatus 1 in the next step.

As a feature of the present invention, as shown in FIG.
From the first step of the work forming line L to the flange forming step Sf, the pitch interval between the two workpieces W, W, and therefore the lower molds 4, 4 in the molding mold 2 for molding these two works W, W. The interval between the spaces (or between the upper molds 5 and 5) is a relatively small normal interval P1, but in the cam forming process Sc that is the process subsequent to the flange forming process Sf, the pitch interval is larger than the normal interval P1 up to that point. Large cam forming interval P2
(> P1) is set (note that C is the center line of the work forming line L). That is, in the press molding apparatus 1 in the cam molding step Sc, as shown in FIG. 5, a cam mold 13 corresponding to the lower mold 4 is laterally provided on the lower mold 4 side adjacent to each lower mold 4 of the molding mold 2. The cam die 14 is supported by a cam base 14 so as to be able to come into contact with and separate from the lower die 4, and the cam die 13 is driven by a cam mechanism (not shown) in accordance with the lowering movement of the upper die 5 to approach the lower die 4. Then, the flange W1 of the work W set on the lower die 4 is pushed by the cam die 13 and further bent toward the center of the work W at an acute angle.
The space between the lower molds 4 and 4 is the cam mold 1
3, the cam base 14, the cam mechanism, and the like are provided as installation spaces. Therefore, the interval between the lower molds 4 and 4 of the molding die 2, that is, the two workpieces W is set to a cam molding interval P2 that is larger than other processes. ing.

In the molding die 2 of the press molding apparatus 1 in the flange molding step Sf, the interval between the workpieces W after molding is matched with the cam molding interval P2 in the molding die 2 in the next cam molding step Sc. Work interval changing device 1 for increasing and changing
6 is provided. This work interval changing device 16 is
As shown in FIGS. 2 to 4 (note that, in FIGS. 2 to 4, mainly, the right half portion of the work gap changing device 16 toward the downstream side of the line L is shown), the flange forming step Sf.
A pair of work lifters 17 respectively arranged in the lower molds 4 and 4 of the pair of molds 2 and 2 in FIG.
It is equipped with 17. Each work lifter 17 separates and raises the work W from the upper surface of the lower die 4 when ascending, and a plate 18 arranged in the lower die 4 and a plurality of projections provided at predetermined positions on the upper surface of the plate 18. Push-up part 1
, 19, and each of the push-up portions 19 is positioned such that the upper surface is lower than the work W on the lower mold 4 at the descending end position so as not to interfere when the work W is molded by the molding die 2. are doing.

Further, a cam mechanism 21 is provided for moving the work lifters 17 in the horizontal direction in accordance with the rise thereof. The cam mechanism 21 includes a pair of guide plates 22, which are provided on the lower surface of the plate 18 of the work lifter 17 so as to project at a predetermined interval in the front-back direction, that is, the direction along the line L.
22, each guide plate 22 is formed with a cam groove 23 corresponding to the cam groove 23 of the guide plate 22 facing each other.
Each of the cam grooves 23 is arranged so that the distance to the other work lifter 17 increases in the upward direction, that is, in the cam groove 23 of the right cam mechanism 21 toward the downstream side of the line L, in the right direction, The cam grooves 23 of the left cam mechanism 21 are inclined to the left. On the other hand, a pair of brackets 24, 24 are attached to the pedestal 3 of each lower mold 4 in the vicinity of the guide plates 22, 22, respectively, and the front end portions of the brackets 24 are engaged with each other so as to extend in the front-rear direction. An engaging pin 25 as a part is attached, and the tip of the engaging pin 25 is engaged with the cam groove 23 of the guide plate 22, and the guide roller 26 rolls in the cam groove 23 at the tip. The work lifter 17 is freely supported, and the work lifter 17 is moved horizontally in the horizontal direction as it moves up and down by the respective cam mechanisms 21. At the lower end position shown by the solid line in FIGS. The work W and the work W on the work lifter 17 are positioned at a position accommodated in the inside of the work W and the work W on the work lifter 17 at the rising end position shown by the phantom line in FIG. 2 and FIG. Apart from the work W Workpiece W with cam forming step Sc in, positioned so as to correspond to the molding position of the W, both the workpiece W, and the distance W as a cam forming interval P2.

Further, the works W, W by the above-mentioned forming die 2
A cylinder 28 is provided as a lift means for driving each work lifter 17 so as to raise the work lifters 17 in synchronization with other work lifters 17 after the molding. That is, each of the cylinders 28 has a cylinder body 29 swingably supported by a horizontal support shaft 31 at an intermediate portion in the longitudinal direction of the cradle 3 of the lower mold 4 and an upper end portion (tip portion). Work lifter 1
On the lower surface of the plate 18 of FIG.
A piston rod 30 swingably connected via a floating joint 32 is provided between the work piece lifter 1 and the work piece lifter 1 as the cylinder 28 extends.
7 moves up from the lower end position and moves to the upper end position. The relationship between the extension operation of the cylinder 28 and the position of the guide roller 26 in the cam groove 23 of each guide plate 22 is as follows.
The guide roller 26 is engaged with the lower end of each cam groove 23 before the cylinder 28 reaches the extension side stroke end.

Further, in the transfer device 6 between the flange forming step Sf and the cam forming step Sc, when both the work lifters 17, 17 in the work interval changing device 16 of the flange forming step Sf are at the rising end position, It is set so that the works W on the work lifters 17, 17 are respectively held by the hands 12, 12 of the unloader 8 and then the hands 12, 12 of the loader 9 and conveyed to the next cam forming step Sc.

Next, to explain the operation of the above embodiment, two workpieces W, W are cut out from the blank carried into the workpiece forming line L, and these workpieces W, W are
After that, while being conveyed by the conveying device 6 between the steps over a number of steps, the forming die 2 of the press forming apparatus 1 is sequentially formed in each step. Then, in the flange forming step Sf which is in the middle of the above-mentioned multi-steps, both the loaded works W, W
Are respectively placed on the lower dies 4 and 4 of the forming die 2, and then the flange W1 is bent and formed on the peripheral edge of each work W by the lowering operation of the upper dies 5 and 5.

In the molding state of the flange W1, each cylinder 28 of the work space changing device 16 is in a contracted state, and each work lifter 17 is housed in the lower mold 4 as shown by a solid line in FIGS. It is in the lower end position. Therefore, the work lifter 17 does not interfere with the forming of the work W by the lower mold 4.

After forming the flange W1 as described above, in the same flange forming step Sf, the interval between the works W and W is from the normal interval P1 until then to the work W and W by the forming die 2 in the cam forming step Sc. The cam forming interval P2 is enlarged and changed according to the forming interval. That is, after each work W is flanged and the upper die 5 is lifted, both cylinders 28, 28 of the work interval changing device 16 are simultaneously extended,
The work lifter 17 connected to the upper end of the piston rod 30 of each cylinder 28 rises from the lower end position to the upper end position and comes out of the lower mold 4, and as the work lifter 17 rises, it is placed on the upper surface of the lower mold 4. The formed work W placed on the work lifter 17 has a push-up portion 19,
It is pushed up by 19, and separated from the lower mold 4 and rises. On the lower surface of the work lifter 17, a guide plate 22,
22 are provided in a projecting manner, and the engagement pins 25 on the side of the pedestal 3 are provided in the cam grooves 23 of each of the guide plates 22 at the tip end thereof.
6, the work lifters 17 that move up along with the extension operation of the cylinder 28 are connected to each other by the cam groove 2
As a result of the guide action of the guide roller 26 in FIG. 3, it moves horizontally in a horizontal direction so as to separate from the other work lifter 17 while rising, and at the rising end position of the work lifter 17, as shown by phantom lines in FIGS. 2 and 3. Both work lifters 17, 17
Between the lower molds 4 and 4 in the next cam forming process Sc from the normal interval P1 up to that point, that is, the interval between the pair of works W placed on the lifters 17 and 17, respectively. It is expanded to the cam forming interval P2 that matches the interval.

At this time, the extension operation of the cylinder 28 and the position of the guide roller 26 in the cam groove 23 of the cam mechanism 21 are related to the guide roller 26 at the lower end of the cam groove 23 before the cylinder 28 reaches the extension side stroke end. Therefore, when the work lifter 17 is lifted due to the extension operation of the cylinder 28, the guide roller 26 engages with the lower end of each cam groove 23 before the cylinder 28 reaches the extension side stroke end, and the work lifter 17 is engaged. Is in the rising end position, the guide rollers 26 on the pedestal 3 side are pressed and locked to the lower ends of the cam grooves 23, respectively, and the lifter 17 positioned between the two locking parts is positioned above the guide rollers 26. It is pushed up by the cylinder 28, and at these three locking points and the connecting point of the cylinder 28 to the piston rod 30, Kurifuta 17 is supported by the cradle 3. As a result, the work lifter 17 is stably held at the rising end position without wobbling.

Then, with the work lifters 17, 17 in the raised end position, the works W, W supported thereon are sucked and picked up by the hands 12, 12 of the unloader 8, respectively, and picked up by the shuttle feeder 7. It is transferred onto the work receiving portion 7a at the retracted end position. After this,
The work receiving portion 7a moves to the forward end position, and the works W, W are adsorbed and picked up by the hands 12, 12 of the loader 9 from the work receiving portion 7a, and then on the lower molds 4, 4 of the next cam forming step Sc. Is set to.

At this time, when the work lifters 17 and 17 are at the rising end positions, the distance between the works W on the work lifters 17 and 17 is set between the lower molds 4 and 4 in the next cam forming step Sc. Since it coincides with the cam forming interval P2, the intervals between the hands 12, 12 of the unloader 8 and the loader 9 may be fixed according to the cam forming interval P2 in the cam forming step Sc. Does not have to be changed during the transportation, and the structure of the transportation device 6 and its control are simplified.

Then, for each work W conveyed in the cam forming process Sc, cam forming is performed between the lower die 4 and the cam die 13 of the forming die 2, and the flange W1 of each work W is bent at an acute angle. To be Then, the work W is conveyed to the next step, and the work W is subjected to predetermined molding.

Therefore, in this embodiment, in the process before the flange forming process Sf in the work forming line L, the interval between the works W is set to a small normal interval P1 so that each work W is formed and the cam forming is performed. In the cam forming process Sc which requires the interval between the works W and W to be enlarged, in the flange forming process Sf before the work W,
Since the interval between the Ws is enlarged and changed to the cam forming interval P2 according to the cam forming step Sc, it is sufficient to use the small forming dies 2 in the press forming apparatus 1 for most of the entire line L and the cost thereof. Can be lowered.
Moreover, after the forming in the flange forming step Sf, the work W,
Since the interval W is enlarged and changed, the interval between the works W and W can be easily changed.

Further, in this way, the work W,
Since the interval of W is changed, when two workpieces W and W are taken from the blank, the interval between the workpieces W and W is set to the normal interval P1 which is small in accordance with the interval in the first step.
It is only necessary to take individual pieces, and it is possible to reduce the loss of the material by reducing the portion located between the works W at that time.

In the above embodiment, the case where two works W and W are taken is shown, but the present invention can be applied to the case where a large number of works W and W is taken to be three or more. .

Further, in the above embodiment, the work interval changing device 16 is provided in the press forming apparatus 1 in the flange forming process Sf of the line L, but a similar work interval changing device is provided at the inter-process position of the line L. You may.

[0039]

As described above, according to the first aspect of the present invention, in the case where a plurality of workpieces are simultaneously formed by a forming die while being conveyed between the steps over a plurality of steps, the multistep process is performed. In the process in which the work interval changing means is provided in the middle of the process, the work is formed with a small space between the works in a normal process, and the space between the works needs to be changed in order to perform the cam forming, etc. By changing the interval between works according to the next process by the work interval changing means, many small molds can be used in the entire molding line, and the cost of the mold can be reduced and the work material loss can be reduced. be able to.

According to the second aspect of the present invention, in the forming die in a predetermined step, a work lifter for separating the work piece from the forming die and raising the work piece at the time of ascending, and an interval between the work lifter and another work lifter is increased according to the rise. As shown in the figure, the cam mechanism horizontally moves the work lifter at the ascending end position so that the distance between the work and other works corresponds to the work forming interval in the forming die in the next process, and the work lifter after forming the work by the forming die. By providing a lift means for driving so as to raise the work, the work interval can be changed after the work is formed by the forming die in a predetermined step of the plurality of steps, and the change of the work interval can be changed. Can be facilitated.

According to the third aspect of the present invention, the work on the work lifter is held by the work holding portion of the transfer means at the rising end position of the work lifter and transferred to the next process. It is not necessary to change the intervals of the holding portions during transportation, and the structure of the transportation means and its control can be simplified.

According to the fourth aspect of the present invention, as the cam mechanism, a pair of guide members are provided on the lower surface of the work lifter, the guide member having a cam portion that is inclined upward in a direction in which the distance to another work lifter increases. On the other hand, the fixed body is provided with an engaging portion that engages with the cam portion of the guide member, and the lift means includes the body portion swingably supported by the fixed body and the work lifter between the guide member at the tip portion thereof. And a piston rod connected to the cylinder, and the engaging portion engages with the lower end of the cam portion of each guide member before the cylinder reaches the extension side stroke end.
When the cylinder is extended and the work lifter is at the rising end position, the lifter is fixed at three points, that is, the engaging portion of the engaging portion with the lower end of the cam portion of each guide member and the connecting point of the cylinder to the piston rod. The work lifter can be stably held at the rising end position.

[Brief description of drawings]

FIG. 1 is a plan view schematically showing a change in a work interval when a flange forming process is moved to a cam forming process in an embodiment of the present invention.

FIG. 2 is a plan view mainly showing a half part of a work interval changing device in a flange forming process.

FIG. 3 is a sectional view taken along line III-III in FIG.

4 is a sectional view taken along line IV-IV of FIG.

FIG. 5 is an enlarged sectional view of an essential part showing a state of forming a work in a cam forming step.

FIG. 6 is a schematic front view showing a flange forming step and a cam forming step in the work forming line.

[Explanation of symbols]

 2 forming die 3 cradle (fixed body) 4 lower die 5 upper die 6 transfer device (transfer means) 7 shuttle feeder 8 unloader 9 loader 12 hand (work holding part) 16 work interval changing device (work interval changing means) 17 work lifter 21 cam mechanism 23 cam groove (cam part) 25 engagement pin (engagement part) 26 guide roller 28 cylinder (lift means) L work forming line Sf flange forming process Sc cam forming process W work P1 normal interval P2 cam forming interval

Claims (4)

[Claims] 1. A press molding apparatus in which a plurality of workpieces are simultaneously formed by a molding die in each step while being conveyed by a conveying means over a plurality of steps, and the next step is performed during the multistep. 2. A press molding apparatus, characterized in that a work interval changing means for changing the interval between the works according to the forming interval of the works by the forming die is provided. 2. The press forming apparatus according to claim 1, wherein the work interval changing means is arranged so as to be capable of moving up and down in a forming die in a predetermined step, and lifts while separating each work from the forming die when ascending. As the work lifter rises, the work lifter is moved horizontally so that the space between the work lifter and another work lifter widens. A press forming apparatus comprising: a cam mechanism corresponding to an interval; and a lift means for driving the work lifter to move up after forming a work by a forming die. 3. The press forming apparatus according to claim 2, wherein the conveying means holds the workpieces on the workpiece lifters and conveys the workpieces to the next step when the workpiece lifters in the workpiece interval changing means are at the rising end position. A press-molding apparatus having a section. 4. The press forming apparatus according to claim 2, wherein the cam mechanism has a pair of cam portions projecting from a lower surface of the work lifter and inclined upward in a direction in which a distance to another work lifter increases. The guide member and a pair of engaging portions provided on the fixed body of the molding die and engaged with the cam portions of the guide member, respectively, and the lift means can swing on the fixed body. A cylinder having a supported body portion and a piston rod having a tip end portion connected to a work lifter between the pair of guide members, and the lower end of the cam portion of each guide member before the cylinder reaches the extension side stroke end. A press-molding device, wherein the engaging portion is configured to engage with.