JPH05237571A - Transfer press - Google Patents

Abstract

PURPOSE:To provide a transfer press capable of discharging a work at a high speed. CONSTITUTION:The transfer press is provided with a press 10 arranging plural dies in parallel and work holding arms arranged so as to face to the same interval as the parallel interval of the dies in a pair of feed bars 22 in extending parallel while holding the dies 13, 15 therebetween and provides transfer mechanism 20 for intermittently carrying the work to the adjacent die by executing box movement interlocking with the press to the feed bars. At the font part in the work carrying direction of the feed bars, plural pallets for accumulating the works are arranged in parallel and on the frame 11, an unloader 30 for shifting the work at the carrying end side to the pallet by the feed bars is provided. When the accumulated quantity of the works in a first pallet 62 becomes full, the accumulation of the works into the adjacent pallet is started with the unloader, and by replacing the pallet becoming full of the works to the empty pallet, the press line is operated at a high speed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer press having a transfer mechanism having a pair of feed bars arranged in parallel with a plurality of dies arranged in parallel.

[0002]

2. Description of the Related Art FIG. 7 shows a conventional transfer press. Reference numeral 1 is a press frame, reference numerals 2 and 3 are upper and lower molds, and a pair of feed bars 4 and 4 extend parallel to each other by sandwiching the mold. It is set up. Arms (not shown) for supporting the work W are provided opposite to the pair of feed bars 4, and the work stacking ends of the feed bars by the destacker 6 are caused by causing the feed bars 4, 4 to perform a box motion. The work supplied to the above is intermittently conveyed forward, whereby the work is sequentially transferred to the lower die 3 of the press. Reference numeral 5 is a drive unit for driving the feed bar 4. A conveyor 7 for paying out the work is provided below the carrying end side of the feed bar 4, and the work transferred to the conveyor 7 by the feed bar 4 is carried forward by the conveyor 7. Then, if the work has a simple shape, it is dropped onto a pallet 8 provided below the front end of the conveyor 7, and if the work has a complicated shape, it is directly taken out by an operator.

[0003]

However, in the above-mentioned conventional transfer press, the works can be accumulated only on one pallet placed in front of the conveyor 7,
It was a constraint in operating the line at high speed. That is, a structure in which a plurality of pallets are slidably arranged in a direction orthogonal to the work transfer direction, and when the first pallet is filled with works, the pallet is slid to replace an adjacent empty pallet is conceivable. However, a cylinder mechanism is generally used as a means for sliding the pallet, but the operation timing of the cylinder mechanism cannot follow the timing of the transfer press capable of high-speed processing. Therefore, even if a plurality of pallets are placed, the transfer press speed is determined according to the pallet exchange speed, which conflicts with the high-speed processing of the press line. The current situation is that the pallets are replaced in.

The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to provide a transfer press capable of discharging a work at high speed.

[0005]

In order to achieve the above object, in the transfer press according to claim 1,
A press in which a plurality of molds are arranged in parallel, a pair of feed bars extending in parallel sandwiching the mold of the press,
Each of the feed bars has a work supporting arm provided to face each other at the same interval as the die arrangement interval, and the work supporting arm is interlocked with a press to clamp → up →
In a transfer press including a transfer mechanism that intermittently conveys a work to an adjacent die by performing a box motion of advance → down → unclamp → return → ..., a plurality of works in front of the feed bar in the work conveyance direction. The pallets for stacking are arranged in parallel, and an unloader for transferring the work on the conveying end side by the feed bar to the pallet is provided in the frame of the press, and the unloader is used to determine the stacking amount of the work in the first pallet. When the quantity becomes fixed, the accumulation of the work on the adjacent pallet is started.

[0006]

A plurality of work accumulating pallets are prepared in the work conveying direction of the transfer mechanism. When the first pallet is full of works, the unloader starts accumulating the works on the adjacent second pallet. , It is possible to take out the pallet full of works without disturbing the high speed operation of the transfer press.

[0007]

Embodiments of the present invention will now be described with reference to the drawings. 1 to 6 show an embodiment of a transfer press according to the present invention. FIG. 1 is a front view of the transfer press, FIG. 2 is a left side view of an unloader, and FIG. 3 is a feed bar (workpiece carrying arm). FIG. 4 is a diagram showing the movement of the unloader hand (workpiece suction hand), FIG. 4 is an operation diagram of transfer with respect to the crank angle of the press, and FIG.
Is an operation diagram of the unloader with respect to the crank angle of the press, and FIG. 6 is a block diagram of a drive control unit of the unloader.

In these drawings, reference numeral 11 is a press 1.
In the frame of 0, the upper ram 12 and the bolster 14 constituting the press 10 each have five dies (upper die 13,
The lower molds 15) are arranged in parallel, and the five upper molds 13 arranged side by side by the lowering of the upper ram 12 mesh with the facing lower molds 15 to form the work W on the lower molds 15. On the other hand, it is designed to press simultaneously.

Reference numeral 20 is a transfer mechanism, which is a mold 1.
A pair of feed bars 22 that extend in the front-rear direction in parallel with each other with 3, 15 sandwiched between them, and a work-carrying arm (not shown) provided on each of the feed bars 22 so as to face each other at the same interval as the die arrangement interval. ) And a drive unit 26 that causes the feed bar (workpiece carrying arm) to perform a box movement (see FIG. 3) in which forward, backward, leftward, rightward, and vertical movements are combined. In this transfer mechanism 20, the feed bar 22 is driven back and forth by a ball screw mechanism driven by driving a first servo motor, and the feed bar 22 is driven left and right by a ball screw mechanism driven by driving a second servo motor. However, a structure in which the feed bar 22 is driven up and down by a rack and pinion mechanism by driving a third servo motor is disclosed in JP-A-3-18435. That is, the feed bars (carrying arms) 22 approach each other and carry the work W on the lower die 15 “clamp” → raise while holding the work “up” → move forward while carrying the work W “advance → Work W
"Down" descending while carrying
"Unclamp" for mounting the carried work W on the lower mold 15 → "Return" to move backward while keeping a distance from each other → "Clamp" for carrying the works W on the lower mold 15 again approaching each other →→… repeats a series of movements.
The operation from "clamp" to "unclamp" is performed when the upper ram 12 is raised and the upper and lower molds 13 and 15 are separated, and the "return" action is performed when the upper mold 13 is lowered. As shown in FIG. 4, the feed bar 22 interlocks with the movement of the press 10 to intermittently convey the work W onto the front lower mold 15.
Then, on the transport end side of the feed bar 22, the work is delivered from the feed bar 22 to an unloader 30 described later.

Reference numeral 25 is a destacker for supplying the work W to the work carrying-in end of the feed bar 22 of the transfer mechanism 20, which is driven by a cylinder while the feed bar 22 is performing an "unclamp" to a "return" operation. The vertical lifting rod 27 sucks the work W stacked in the lower pallet and ascends it, and the suction holding is released during the “up” operation of the feed bar 22, and the work W is carried by the work carrying arm of the feed bar 22. To be done. The pair of feed bars 22, 22 between the destacker 25 and the press frame 11 have a press 1 at the center in the width direction.
Work mounting bases 28 are provided at the same intervals as the die arrangement intervals in 0, and the work W before being carried into the press 10 is temporarily mounted on the work mounting bases 28.

Reference numeral 30 is an unloader provided on the side surface of the frame 11 of the press, and an unloader hand 32 having a structure in which three sets of parallel links A, B and C of the first, second and third sets are combined, and A bracket 38 that supports the unloader hand 32 and fixedly holds it on the side surface of the press frame 11.
It consists of and. The first parallel link A includes a suction hand 41, a link 42, a link 43, and a bracket 44.
And the second parallel link B comprises a bracket 4
4, link 45, link 46, and link 47, and the third parallel link C is link 46, link 4
8, link 43, and link 49.
The link 46 is rotated by the _first servo motor M ₁ and the link 49 is rotated by the second servo motor M ₂ . By controlling the drive of these servomotors M ₁ and M ₂ , the unloader hand 32, that is, the suction hand 41, suctions the work W on the work transfer end side of the feed bar 22 as shown in FIG. "Up" → Move forward while adsorbing the work "Advance" → Move down while adsorbing the work "Down" → Release the adsorption of the work and drop the work on the pallet, then "Up" → Feed A series of movements of "return" → reverse to the work transfer end position of the bar 22 → "down" → to descend to adsorb the work is performed. The down speed of the unloader 30 is set to be higher than the down speed of the feed bar 22 of the transfer mechanism 20, so that the down operation of the feed bar 22 and the down operation of the unloader 30 are completed at the same time. Is set so that the workpiece W is sucked by the workpiece W (see FIGS. 4 and 5), whereby the workpiece W is smoothly transferred from the feed bar 22 to the unloader 30.
Is handed over. Then, the work W on the carry-out end side of the transfer mechanism 20 is dropped onto the pallet 62 in front of the transfer mechanism 20 by the unloader 30.

In front of the feed bar 22 and below the unloader 30, two pallet transfer machines 60 (60A, 60B) are arranged in parallel in the work transfer direction. The pallet transfer machine 60 has a plurality of work accumulating pallets 62 and has a structure in which each pallet 62 can be slid and conveyed by a cylinder (not shown) in a direction orthogonal to the work conveying direction of the feed bar 22. The pallets 62 are located at a first position P ₁ on the side close to and a second position P ₂ distant from the feed bar 22 adjacent thereto. Then, the unloader 30 first continues to drop the work on the pallet 62 at the first position P ₁ ,
When the pallet 62 at the second position is full, the pallet 62 at the second position is started, and when the pallet 62 at the second position P ₂ is full, the work is dropped on the pallet 62 at the first position P ₁ again. When the accumulation amount of the workpieces at is full, the dropping position is switched. Then, the work dropping position of the unloader 30 is switched, and the second
Since there is time until the work accumulation starts again on the pallet at the position P ₂ after the work accumulation starts on the pallet at the position P ₂ , the first transfer device 60A is driven during this period. The position of the pallet is shifted so that the empty pallet is located at the first position P ₁ . Then, when the second pallet is full, the unloader 30 starts dropping the work onto a new empty pallet placed at the _first position P _1. Therefore, similarly, the second transfer device 60B is driven to empty the work. Position the pallet at the second position P ₂ .

The movement of the unloader 30 is interlocked with the rotation angle of the crankshaft of the press 10, as shown in FIG. The unloader driving servomotors M ₁ and M ₂ are driven by a CPU 52 having a modified sine wave table for controlling the movement of the unloader hand 32, as shown in FIG.
A control unit 50 including a correction processing unit 54 that switches a control pattern according to an external switching signal causes a first pattern for dropping a work at a first position P ₁ and a work at a second position P ₂ . It is controlled so as to take the alternative to the second pattern. That is, the CPU 52 has a modified sine wave table that determines the operation characteristics with respect to the crank angle of the press 10, and servos a value based on the synchronization signal θ from the resolver provided on the crank shaft of the press 10 via the correction processing unit 54. Output to the amplifier 56, which drives the servo motor M ₁ to follow the movements of the press 10 and the transfer mechanism 20 and to unload the hand 32.
Performs a series of operations of up → advance → down → up → return → down. The correction processing unit 54 is a CPU
With respect to the output f (θ) from 52, a correction value A suitable for conveying the work to the first position P ₁ and a correction value B suitable for conveying the work to the second position P ₂ are selected. Output f (θt) from the correction processing unit 54, for example, when the rotation angle of the crankshaft of the press is 0 and the external switching signal Sw ≠ 0,
The switch in the correction processing unit 54 is switched, and Af (θ
From t) to Bf (θt). That is, the correction processing unit 54
When the signal from the optical sensor 63 (63a, 63b) installed facing the upper opening of the pallet 62 described later is received and the 0-degree position of the crank shaft of the press 10 is confirmed, the switch in the processing unit is switched. To correct the correction factor A →
Switch to B or B → A. Although not shown, the drive control of the servo motor M ₂ is also performed in the same manner as the drive control of the motor M ₁ shown in FIG. 6, whereby the first position P _{1 is controlled.}
If palette is full of the work to the second pallet position P _2, and the unloader 30 dropped position of the workpiece is automatically according to the second pallet P ₁ is full and becomes again the first position P ₁ of the pallet It is designed to switch to.

The reference numeral 70 designates a conveyor 70 disposed between the pallet transfer machine 60 and the feed bar 22. The conveyor 70 has a structure in which a work which the unloader 30 has failed to adsorb is discharged and is carried out by a chute 72. In the above-described embodiment, the switching signal for the correction coefficients A and B in the correction processing unit 54 is described as being based on the output from the optical sensor 63. However, for example, the unloader 30 and the unloader hand 3 may be used.
It is also possible to incorporate a counter that counts down operation 2 and output a switching signal to the correction processing unit 54 upon receiving an output from the counter when the count value of the counter reaches a predetermined value.

Further, in the above-mentioned embodiment, two pallet transfer machines are used.
Although the groups are arranged in parallel, three or more groups may be arranged in parallel.

[0016]

As is apparent from the above description, according to the transfer press of the present invention, a plurality of work accumulating pallets are prepared in the work conveying direction of the transfer mechanism, and the first pallet is a work. When full, the unloader starts collecting work on the adjacent second pallet, so while the unloader is collecting work on the second pallet, the full pallet is replaced with an empty pallet. As a result, the transfer press line can operate at high speed.

[Brief description of drawings]

FIG. 1 is a front view of a transfer press which is a first embodiment of the present invention.

FIG. 2 is a left side view of the unloader (view from the left side of FIG. 1)

[Figure 3] Transfer operation diagram

[Fig. 4] Operation diagram of unloader

FIG. 5 is a diagram showing movements of a feed bar and an unloader.

FIG. 6 is a block diagram of a drive control unit of the unloader.

FIG. 7 is a front view of a conventional transfer press.

[Explanation of symbols]

 10 Press 11 Press Frame 13, 15 Mold 20 Transfer Mechanism 22 Feed Bar 30 Unloader 50 Unloader Control Unit 60 Pallet Transfer Machine 62 Work Accumulation Pallet 70 Transfer Conveyor

Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location B30B 13/00 A 7819-4E B65G 57/04 7018-3F

Claims (2)

[Claims] 1. A press in which a plurality of dies are arranged in parallel, a pair of feed bars extending in parallel with the dies of the press, and an interval equal to a die arrangement interval in each of the feed bars. And a work supporting arm provided so as to face each other, and the work supporting arms are linked to each other by performing a box motion of clamp-up-advance-down-unclamp-return -... A transfer mechanism that intermittently conveys to the mold,
In a transfer press equipped with, a plurality of work accumulating pallets are arranged side by side in front of the feed bar in the work conveying direction, and an unloader for transferring the work on the conveying end side by the feed bar to the pallet is arranged on the frame of the press. The transfer press, wherein the unloader is provided, and starts the stacking of the work on the adjacent pallet when the stacking amount of the work in the first pallet reaches a predetermined amount. 2. Below the conveying end side of the feed bar,
2. The transfer press according to claim 1, further comprising a transfer conveyor for paying out a work which the unloader failed to transfer.