JPH02299730A - Work carrying device of transfer pressing machine - Google Patents

Abstract

PURPOSE:To increase the carrying efficiency by constituting to make the height of attracting plates arranged on the both sides of the drawing die higher comparatively when the height of other attracting plates which carry the work between another dies and avoiding the interference with the blank holder of the drawing die. CONSTITUTION:Various kinds of types of dies 16, 18 including the drawing die are aligned in a line along the carrying direction of the work W. The attracting plates 46 attached to a respective cross bar 44 set at plural trucks 42 moving on the beam 38 having a freely elavating/lowering mechanism moves the work one by one between dies while holding the work, thus the carrying device 36 is constituted. The attracting plate 46 set at the truck 42 which feeds the work in the above drawing die and the attracting plate 46 set at the truck 42 which bring the work out from the drawing die are freely adjustable with the actuator of a hydraulic cylinder 34 etc., which moves the plate 46 freely elavatable/lowerable. The moving locus of the other attracting plates is not needed to fit to this, so the work is able to be carried along the most efficient route and the increase of the carrying efficiency is achieved.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a workpiece conveyance device in a transfer press machine, and more particularly, to a workpiece conveyance device for automatically conveying a workpiece between molds of a transfer press machine. Even if there is a difference in height between the molds, it is possible to increase the transport speed of the workpiece by adjusting the height of the workpiece transport mechanism, thereby improving production efficiency. The present invention relates to a workpiece conveyance device in a transfer press machine.

[Background of the Invention] Conventionally, in a transfer press machine, in order to perform drawing, trimming, venting, piercing, etc., press dies are arranged in a line in the conveyance direction of the workpiece, and the press dies are arranged in a line in the conveyance direction of the workpiece and pressed while holding the workpiece. A moving suction disk is sequentially conveyed to the molds for the next step by a conveyance device placed between each mold, and a series of plastic working is performed continuously.

The manner in which workpieces are transported in such a transfer press machine depends exclusively on the specifications of the transfer press machine. For example, in a transfer press machine in which a suction disk is arranged on a crossbar and the workpiece is transported to each press processing process by this suction disk, the respective molds are arranged at equal intervals along the conveyance direction. Generally, it is necessary to set the movement path of the suction disk to be the same between molds.

However, the molds are generally arranged in the order of drawing mold, trimming mold, bending mold, and piercing mold in order from the direction in which the work is carried in, and the blank holder that makes up the drawing mold is Initially, since it is located higher than the machining surface of the lower die, the moving path of the suction plate holding the workpiece must be set accordingly. Since there is no blank holder for molds, trimming molds, and piercing molds, there is no need to make the electric transmission path of the suction plate high between these molds.However, for smooth conveyance of the workpiece, Since it is necessary to match the height of the bending die, trimming die, and piercing die to the height of the conveyance path to the drawing die mentioned above, the conveyance path also requires a large height difference, and therefore the workpiece It has been pointed out that the required transportation time becomes longer and the progress of the process becomes inefficient.

As a measure to deal with this, it is possible to adjust the heights of the molds by installing each mold on an adapter stand, but this is burdensome in terms of cost and labor.

[Object of the Invention] The present invention has been made in order to overcome the above-mentioned disadvantages. By making the height of the suction plate adjustable, it is not necessary to adjust the height between molds, and optimal conveyance efficiency can be achieved.
It is an object of the present invention to provide a workpiece conveyance device in a transfer press machine that contributes to an efficient press process.

[Means for Achieving the Object] In order to achieve the above-mentioned object, the present invention is provided in a transfer press machine in which various molds including a drawing mold are arranged in a line along the conveyance direction of the workpiece, and In a conveying device that sequentially moves the workpiece between molds while holding the workpiece with a suction disk attached to a bar installed on a plurality of carts that move freely on a beam, the workpiece is carried into the drawing mold. The present invention is characterized in that an actuator is provided to freely move up and down the suction disk provided on the cart for transporting the workpiece and the suction disk provided on the cart for transporting the workpiece from the drawing die.

[Embodiments] Next, preferred embodiments of the workpiece conveyance device in a transfer press machine according to the present invention will be described in detail with reference to the accompanying drawings.

In FIG. 1, reference numeral 10 indicates a transfer press machine equipped with a workpiece conveyance device according to this embodiment.

This transfer press machine 10 has a thin plate workpiece W.
A press die for performing required plastic working on the workpiece W is disposed along the conveyance direction of the workpiece W. That is, lower molds 16a to 16d are fixed at equal intervals to a bolster 14 placed on a base 12 of the transfer press 10, and an upper mold 18a opposite to these lower molds 16a to 16d is fixed. 18d to 18d are fixed via bolsters 22 to a vertically movable lifting platform 20. Note that a carry-in station 24 for stacking workpieces W is provided on the left side of the lower die 16a, and a carry-out station 26 for carrying out processed workpieces W is provided on the right side of the lower die 16d.

The lower mold 16a and the upper mold 18a are drawing molds, and the lower mold 1
6b and the upper mold 18b are trimming molds, and the lower mold 16c
and the upper mold 18c are bending molds, and the lower mold 16d and the upper mold 18
d is a piercing mold. While being transported, the workpiece W is processed into a predetermined sheet metal product through a drawing process, a trimming process, a bending process, and a piercing process in sequence using these molds.

Here, as shown in FIG. 3, the lower die 16a, which is a drawing die, is provided with a blank holder 28 that fits onto the lower die 16a, and this blank holder 28 is supported by a plurality of cushion pins 30. This cushion pin 30 is connected to a piston rod 34a of a hydraulic cylinder 34 that absorbs the downward displacement of the blank holder 28 via a cushion plate 32 that holds the cushion pin 30.

Before drawing, the workpiece W is positioned on the blank holder 28, as shown in the figure. Thereafter, the upper mold 18a is lowered and the blank holder 28 is pushed down under the buffering action of the hydraulic cylinder 34, and the upper mold 18a and the lower mold 1 are
Drawing processing is applied to the workpiece W by the cooperative work of 6a.

Next, the transfer press machine 10 as described above is provided with a transport device 36 that sequentially moves the workpiece W between the loading station 24, the lower molds 16a to 16d, and the tl station 26. In Figures 1 and 2,
As will be described later, this transport device 36 includes a pair of vertically movable lifting beams 38, five sets of moving carts 42a to 42e that move along rails 40 laid on the lifting beams 38, and Cross pars 44a to 44 are respectively installed between the pair of movable carts 42a to 42e.
It includes suction discs 46a to 46e attached to e, and a drive unit 48 for displacing the movable carts 42a to 42e.

First, in the drive section 48 , a first bevel gear 52 attached to the tip of a drive shaft 50 connected to a drive source (not shown) meshes with a second bevel gear 54 . A belt 66 is stretched between the integral pulley 56 and a pulley 64 integral with a cam 62 that rotates about a shaft 60 .

A bent end of a rank 68, which is swingable about a shaft 67, is in sliding contact with the outer circumference of the cam 62. In this case, a link 70 is connected to the crank 68 at a substantially central portion thereof.
A first horizontal rack 72 is connected to the first horizontal rack 72 via a guide rod 74, and a second horizontal rack 76 is connected to the first horizontal rack 72 via a guide rod 74. This first horizontal rack 72
, a pinion 78,80 meshes with the second horizontal rack 76, and a first vertical rack 82 and a second vertical rack 84, which mesh with the pinion 78,80, are connected to the lifting beam 38.

On the other hand, the movable carts 42a to 42e each have a connecting member 8.
6, the lower die 16d and the unloading station 2
The movable cart 42e disposed between the cranks 6 and 6 is connected to the distal end of the crank 68 via a link 89 connected to a rod 88.

Next, cross pars 442 to 44e are installed between the pair of mobile carts 42a to 42e, and a required number of suction discs 46a to 44e as work holding means are connected to each cross par 44a to 44e via stays 90. 46e is attached. In this case, FIG. 4 particularly shows the moving carriage 42a that transports the workpiece W from the loading station 24 to the lower die 16a, and the moving carriage 42b that transports the workpiece W from the lower die 16a to the lower die 16b. Note that the movable carts 42a and 42b have the same configuration, so only the movable cart 42a will be described. That is, the cross spar 442 is supported by a mounting base 92 via a holding member 94 on the upper surface of the movable trolley 42a, and the mounting base 92 is such that the tips of the piston rods 96a of the respective cylinders 96 fixed at the four corners of the mounting base 92 are attached to the movable trolley 42a.
By being connected to the side, it can be raised and lowered freely. In addition, as shown in FIG. 5, the suction disk 46a may be moved up and down by connecting the suction disk 46a to a piston rod 100 of a cylinder 9B directly attached to the cross spar 44a.

The workpiece conveyance device in the transfer press machine according to this embodiment is basically configured as described above, and its operation and effects will be explained next.

First, the general operation of the work transfer device 36 will be described. In FIG. 1, a rotational drive source (not shown) is driven, and the drive shaft 50 is rotated.

The rotation direction of the drive shaft 50 is changed through the first bevel gear 52 and the second bevel gear 54, and is further transmitted to the cam 62 through the belt 66 between the pulleys 56 and 64, and this cam 62 rotates the shaft 60. Rotates as a fulcrum. As the cam 62 rotates, the crank 68 whose end portion is in sliding contact with the cam 62 swings about the shaft 67, so that the first horizontal rack 72 connected to the crank 68, The second horizontal rack 76 moves horizontally. As a result, the first horizontal rack 72, the second horizontal rack 7
The pinion 78.80 that meshes with the vertical rack 6 rotates, and furthermore, this pinion 78.80 meshes with the first vertical rack 82 and the second vertical rack 84 that are connected to the lifting beam 38. 38 can be displaced in the vertical direction by the rotation of the cam 62.

In addition, in synchronization with the displacement of the lifting beam 38, five sets of movable carts 42a to 42e, which are connected to the tip of the crank 68 via a link 90 and a rod 88, move along the rail 40 of the lifting beam 38. to move horizontally.

From the above, as shown in FIG. It can be periodically displaced along the locus shown by the dashed line.

Next, the operation of the workpiece conveyance device 36 will be explained along with the progress of the press process in the transfer press machine 10.

First, a suction disk 46a picks out one piece of work W as a blank material stacked on the loading station 24 and transports it to the lower mold 16a, and the work W is transported between the lower mold 16a and the lower mold 16b. The height of the suction plate 46b is set as follows. That is, in FIG. 4, a cross spar 448, which is installed on movable carts 42a, 42b running between the loading station 24 and the lower mold 16a,
44b is raised and the height of the suction plates 46a, 46b attached to the cross pars 44a, 44b is increased by an amount corresponding to the lifting distance β of the blank holder 28, and the other suction plates 46c are raised.
It is set higher than the positions 46e to 46e. Mobile trolley 42a
, 42b of the piston rod 9 of the cylinder 96 provided in
When 6a is moved forward, the cross spar 44a144b supported by the mounting base 92 via the holding member 94 rises, and the heights of the suction discs 46a, 46b are set as described above.

At this time, suction discs 46a to 46e placed between each mold
The standby position of the suction plates 46a and 4 is as shown in FIG.
The standby positions A and B of the suction discs 6b are higher than the standby positions C of the other suction discs 46a to 46e by l. By doing so, the trajectory of the movement of the suction disc 46a146b is translated upward from the dashed line to the trajectory shown by the solid line, and as a result, interference with the blank holder 28 is avoided.

Hereinafter, although the workpiece W is transported simultaneously between the respective molds, for convenience of explanation, the manner in which the workpiece W is transported into and out of the lower mold 16a will be mainly described based on FIG. 3.

The suction disk 46a is displaced from the standby position A to the carry-in station 24, and attracts the workpiece W on the carry-in station 24. The suction disk 46a reaches above the lower mold 16a while holding the work W, the suction state of the suction disk 46a is released, and the work W is placed on the blank holder 28.

Thereafter, the suction disk 46a returns to the standby position A.

On the other hand, the suction disk 46b moves the drawn workpiece W held in the blank holder 28 from the standby position B.
It is displaced to this point and adsorbed to this workpiece W. Although the blank holder 28 is at the upper limit position, since the height of the suction disc 46b is increased in advance as described above, interference between the suction disc 46b and the blank holder 28 is avoided. Suction board 46
After b moves to the top of the lower die 16b, the suction state is released and the workpiece W is placed on the lower die 16b. Thereafter, the suction disk 46b returns to the standby position.

Furthermore, between the other lower dies 16b to 16d, suction discs 46b to 46e are displaced so as to draw trajectories shown by dashed-dotted lines, and the workpiece W that has been processed in the previous process is transported.

Thereafter, the upper molds 18a to 18d are lowered relative to the lower molds 16a to 16d, and a predetermined pressing process is performed on each workpiece W. For example, when explaining the drawing process,
While the upper die 18a presses down the blank holder 28, the drawing process is performed in cooperation with the lower die 16a. Similarly,
Other molds, namely the lower molds 16b to 16d and the upper mold 18
By the cooperation of b to 18d, trimming, bending, and piercing are performed, respectively.

After processing is completed, when the upper molds 18a to 18d rise, in the lower mold 16a, the piston rod 34a of the hydraulic cylinder 34 extends, and the blank holder 28 is displaced to the rising end position, and the workpiece W is moved to the lower mold. The mold is released from 16a.

Then, by repeating the same steps as described above, the workpiece W is sequentially transported and processed into a sheet metal part.

[Effects of the Invention] As described above, according to the present invention, the height of the suction discs arranged on both sides of the drawing die can be made higher than that of other press die for conveying the workpiece. This makes it possible to avoid interference with the blank holder of the drawing die. In this case, since it is adjustable using an actuator such as a cylinder, there is no need to match the trajectory of displacement of other suction discs, so the workpiece can be transported along the most efficient route as a whole, resulting in higher transport efficiency. The effect of improving this can be obtained.

Although the present invention has been described above with reference to preferred embodiments, the present invention is not limited to these embodiments.
Of course, various improvements and changes in design are possible without departing from the gist of the present invention.

[Brief explanation of the drawing]

Fig. 1 is a side view showing the configuration of a transfer press machine to which the workpiece conveyance device according to the present invention is applied, and Fig. 2 is a partially omitted illustration showing the arrangement of the mold and moving cart of the transfer press machine in Fig. 1. A plan view, FIG. 3 is an explanatory diagram of the operation of the workpiece conveyance device, FIG. 4 is a side explanatory diagram of the main part of the workpiece conveyance device, and FIG. 5 is a side explanatory diagram of the main part of the conveyance device according to another embodiment. be. 10... Transfer press machine 12... Base 14... Bolster 16
a to 16d...lower die 18a to 18d...upper die 20...lifting table 36...workpiece conveyance device 38...lifting beam 40...rail 46
2-46d...Suction board 48a-48d...Moving trolley 50...Drive shaft 52.54...Bevel gear 62...Cam 68...Crank 72.76...Horizontal rack 78.80 ...
Binion 82.84...Rack (1 other person)

Claims (4)

[Claims] (1) A transfer press machine is equipped with various molds including drawing molds arranged in a line along the conveyance direction of the workpiece, and bars are installed on multiple sets of carts that move on beams that can be raised and lowered. In a conveying device that sequentially moves the workpiece between molds while holding the workpiece with an attached suction disk, a suction disk provided on the cart that carries the workpiece into the drawing die and a cart that carries the workpiece out of the drawing die. 1. A workpiece conveyance device for a transfer press machine, characterized in that an actuator is provided for a suction disk provided in the transfer press machine to freely move the suction disk up and down. (2) In the device according to claim 1, the suction disk is disposed on a crossbar attached to a cart that runs along a lifting beam extending in the conveyance direction of the workpiece, and the suction plate is disposed on a crossbar attached to a trolley that runs along a lifting beam extending in the transport direction of the workpiece, and A workpiece conveyance device for a transfer press machine, characterized in that an actuator is provided between the crossbars to allow the crossbar to move up and down. (3) A workpiece conveyance device in a transfer press machine according to claim 1, wherein the suction disk is disposed on an actuator attached to a crossbar. (4) A workpiece conveyance device in a transfer press machine according to claim 2 or 3, wherein the actuator is a cylinder.