JPH11188437A - Transfer drawing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a processing control easy and carry out a processing of high accuracy by moving a press and a transfer conveyer upwards/downwards without a loss time while accurately and steadily synchronizing them and, by freely adjusting a drawing speed. SOLUTION: This transfer drawing device comprises a transfer conveyer 2, a transfer face 2S of which is movable upwards/downwards, and a drawing processing press 3 having an upper die 20 to be attached to a bottom die 19 and an elevating stand 4. A push down unit 5 is installed on the elevating stand 4 to push down the transfer face 2S when it descends. A lifting up unit 6 to return the lowered transfer face 2S to its original position, and a positioning unit 7 to positioning the work W are provided with the transfer conveyer 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transport drawing device capable of performing drawing work accurately and quickly on an end of a long metal work such as a shaped steel material.

[0002]

2. Description of the Related Art In a building such as a prefabricated construction method in which walls, floors, and the like are formed by panel bodies, an outer frame of the panel body is often formed by a frame of a shaped steel material having excellent rigidity. As shown in FIG. 5, an end e of the other work W2 is fitted and welded to a groove W1a of one work W1 made of, for example, a channel steel or the like. Will be applied.

[0003] On the other hand, the drawing of the work W2 is generally performed by using a transfer facility for transferring and placing and holding the work W, and a press for drawing the end e of the placed and held work W. The mounting surface of the transport equipment is moved up and down in synchronization with the upper and lower drawing strokes of the press.

[0004]

However, conventionally,
The transfer unit, a driving unit for vertically moving the mounting surface,
Since the press has a mechanism different from the drive unit for moving the mold up and down, the synchronization between the press and the transport equipment is performed by controlling both drive units electrically or mechanically independently. ing.

[0005] As a result, control becomes complicated, and electrical and mechanical loss times occur during tuning, thereby impairing production efficiency. Further, in order to increase the speed by changing the drawing processing speed, it is necessary to change the control in both driving units, and there is a problem that there is a risk that the processing accuracy is reduced.

Accordingly, the present invention is based on the provision of a press tool for moving an upper die up and down, which is provided with a press-down device which abuts on a conveyor and presses down the conveying surface directly when descending. It is an object of the present invention to provide a conveying / drawing apparatus which can move up and down while accurately and reliably synchronizing a conveyor with no loss time, and which can freely change a drawing speed without impairing processing accuracy.

[0007]

In order to achieve the above-mentioned object, the present invention provides a conveying squeezing device comprising a conveying conveyor having a conveying surface capable of moving up and down, and a lower die and a vertically movable table which can be moved up and down. A press that forms a squeezed portion at the end of a long workpiece that is conveyed on the transfer surface and has a die, and presses the transfer surface against the transfer conveyor when descending the lift table. A lifting tool comprising a linear motion machine for returning a transport surface lowered to the transport conveyor to an original position, and a positioning piece for engaging and positioning the workpiece by being vertically movable and upwardly movable. And a positioning tool having the following.

The use of a shock absorber as the press-down device and the use of an air cylinder as the linear motion machine of the lifting device can absorb and reduce shocks and vibrations at the time of abutment or drawing of the press-down device, thereby reducing noise. It is preferable for suppressing the occurrence of the heat treatment and improving the processing accuracy.

Further, it is difficult to lift the pinch roller through the work when the positioning piece that moves upward does not engage with the work and the positioning is poor, using a pinch roller that presses the upper surface of the work and feeds the work. It is preferable in preventing the generation of non-defective products and increasing the yield rate of non-defective products, and is also useful for improving work safety.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. In FIG.
Comprises a transport conveyor 2 whose transport surface 2S can move up and down, and a press 3, and a lifting table 4 of the press 3 is provided with a press-down device 5 for pushing down the transport surface 2S, and the transport conveyor 2 The lifting tool 6 for returning the lowered transport surface 2S1 to the original position and the positioning tool 7 for positioning the work W
Are provided.

In this embodiment, the work W is a channel steel having flanges 10B raised at both ends of a web 10A as shown in FIGS. Next, a description will be given of a case where a narrowed portion 11 fitted into the groove W1a of one of the works W1 and a bent portion 12 along the bottom surface of the groove W1a are formed. Prior to the drawing process by the transport drawing device 1, the work W is provided on the work W as shown in FIG.
A punching process for forming a projection 12A forming the bent portion 12 on the web 10A by punching the end portion e is performed by a well-known punching press 13.

The transport conveyor 2 of the transport squeezing device 1 comprises:
As shown in FIGS. 1 and 2, there are provided a conveyor section 2A in which conveying rollers 15 are arranged side by side between frames, and a posture maintaining section 2B for guiding the conveyor section 2A in parallel and up and down without shifting in front and rear and left and right. The posture maintaining portion 2B is formed in a so-called table lifter shape in the present example having the link mechanism 16, for example. Therefore, the transport surface 2S formed by the upper edge of the driving roller 15 can be moved up and down by the posture maintaining unit 2B. In this example, the two conveyors 2, 2 are arranged in a straight line so as to be transitable, and a press 3 is provided between the conveyors 2, 2.

The press 3 is of a mechanical type (crank type),
A press brake of a hydraulic type or the like, in which a lower mold 19 is mounted on a fixed table 17 via a die holder, and an upper mold 20 is connected to a vertically movable lifting platform 4 via a punch holder. Mounted. The upper and lower mold 2
Reference numerals 0 and 19 denote so-called press-drawing types. In this example, the rear end of the work W on the front side in the transport direction and the work W on the rear side.
Draw and bend both sides of the front end in one press operation.

As shown schematically in FIG. 2, in the present embodiment, the lower mold 19 has a concave portion surrounded by a side wall surface 21 having a shape conforming to the outer contour of the narrowed portion 11 and an end surface 22 for forming a bent portion. 23
Equipped. The end surface 22 has a vertical stopper surface portion 22A for stopping the work W by contacting the end end e of the work to be conveyed by exceeding the conveyance surface 2S upward. The end surface 22 has an inclined surface portion 22B which is inclined inward downward from the stopper surface portion 22A.
The bent portion 12 is formed by lowering the edge of the protrusion 12A along the inclined surface portion 22B.

At the bottom of the recess 23, a knockout 24 for pushing out the work W once narrowed out from the recess 23 is provided.
Are arranged to be able to move up and down freely.

The upper mold 20 has a peripheral wall that matches the inner contour of the narrowed portion 11 and the bent portion 12.
Is moved from the upper limit height position P1 at which the mold lower surface 20S is separated from the upper surface of the work W on the transfer surface 2S to the contact height position P2 at which the mold lower surface 20S contacts the work W upper surface.
To move to the lower limit height position P3 where the drawing / bending process is completed.

The lift 4 has an arm 25 extending above the conveyor 2, and the tip of the arm 25 pushes down the conveyor surface 2S by abutting the conveyor 2 when descending. A pressing tool 5 is provided.

In the present embodiment, the depressing device 5 is a shock absorber using, for example, an air cylinder at its stroke end, and constantly applies a constant internal pressure. Therefore, when an impact force exceeding the rod extension force due to the constant internal pressure acts on the contact piece 5A at the rod end, the rod contracts and the impact can be absorbed and reduced. In addition, for a load that does not exceed the rod extension force, the rod can maintain the extended state at the stroke end. Therefore, it is necessary to perform a descending operation on the transport surface 2S that is completely synchronized with the lift table 4. Can be. In addition, various shock absorbers using an elastic body such as rubber or a spring may be used as the pressing device 5.

In the transport conveyor 2, a receiving piece 26 for receiving the contact piece 5A of the press-down tool 5 is erected on the frame, and a linear motion machine that returns the lowered transport surface 2S to its original position. Lifting tool 6 and a positioning tool 7 for positioning the workpiece W. Further, in this example, a work feeder 29 having a pinch roller 27 is arranged on the conveyor 2.

In the present embodiment, the linear motion machine of the lifting device 6 comprises an air cylinder, like the pressing device 5, and lifts the transport surface to the original position by the lifting force of the rod due to the additional internal pressure. In this example, by constantly applying a constant internal pressure to the lifting device 6, the lifting device 6 can exert a lifting force smaller than the rod extension force of the pressing device 5,
Always occurs.

Therefore, the pushing-down device 5 is used for the transfer conveyor 2.
Between the upper limit height position P1 and the abutment height position P2, where no contact is made, the lifting tool 6 pushes up and holds the transport surface 2S to the original position by the pushing force. In addition, between the contact height position P2 and the lower limit position P3 where the presser 5 comes into contact with the transport conveyor 2, the lifting table 4 is maintained while the rod of the presser 5 is maintained in the extended state.
The transport surface can be moved up and down completely in synchronism with the up and down movement of.

As described above, as in the present embodiment, the lifting device 4 and the lifting device 6 are formed by air cylinders and are always used under a constant pressure, so that the lifting table 4 and the transfer surface 2S can be synchronized. Can be achieved more easily,
The effect of absorbing and mitigating impact can be further improved.

In the present embodiment, the positioning member 7 has a tapered pin shape and includes a positioning piece 30 that rises between the driving rollers 15. The positioning piece 30 is vertically movably supported from a lower position where the upper end thereof is separated below the conveying surface 2S to an upper position where the positioning piece 30 exceeds the upper side. As shown in FIG. W web 10
The workpiece W is positioned by inserting and engaging the positioning hole 31 provided in A. Especially the positioning piece 30
Is formed in the shape of a tapered pin that picks up the positioning hole 31, whereby a minute positional deviation can be automatically corrected and the positional accuracy can be secured at a high speed. The positioning hole 31 is
The punch 13 is punched at the same time as the projection 12A.

In the present embodiment, the work feeder 29 is mounted on a gate-shaped support frame 32 extending between frames.
A pinch roller 27 for pressing the upper surface of the upper work W is provided. In this example, the pinch roller 27 is provided with the support frame 3.
2 and is pivotally attached to a rod end of a linear motion machine 35, for example, a cylinder. Note that, in the present embodiment, one of the transport roller 15 and the pinch roller 27, the transport roller 15 is formed as a drive roller.

If the work W is misaligned during the transfer and the positioning holes 31 and the positioning pieces 30 do not match, as shown in FIG. This work W without engaging with W
Up diagonally. At this time, the pinch roller 27
Also, the pressing force of the pinch roller 27 is set so as to be lifted together with the work W. Thereby, the displacement of the workpiece W can be detected prior to the processing, and a processing error can be prevented. In this example, the switch SW for detecting the lifting of the pinch roller 27 and stopping the press 3 is connected to the support frame 32.
And so on.

FIG. 8 shows a case where the conveying and squeezing device 1 of the present invention is arranged on a production line L. In the figure, 4
Reference numeral 0 denotes a carry-in conveyor for carrying the work W cut into a predetermined length, and before and after the punching press 13,
Conveying conveyors 41 and 42 for punching are arranged so that the work W from the carry-in conveyor 40 can be transferred.
The punching press 13 is provided with the protruding portions 12 on both the front end of the work on the front side and the front end of the work on the rear side.
A and the positioning hole 31 are formed simultaneously. The transport conveyors 41 and 42 hold the work W at a constant height without synchronizing with the punching press 13.

The workpiece W transferred from the conveyor 42 to the conveyor 2 is conveyed to a position where the work W comes into contact with the stopper surface 22A of the lower mold 19 by the pressing of the pinch roller 27. Thereafter, when the positioning piece 30 is raised and engaged with the workpiece W, for example, the signal is detected and
The elevator 4 descends.

Here, as shown in FIG.
The distance h1 between the upper limit height position P1 and the contact height position P2 of S is determined by the contact piece 5 in the state of the upper limit height position P1.
It is the same as the distance h2 between A and the receiving piece 26. Therefore,
At the same time as the drawing of the upper mold 20 is started, the pressing tool 5 abuts on the conveyor 2. Then, due to the force balance between the pressing tool 5 and the lifting tool 6, during the drawing, the transport surface 2S is moved up and down in synchronization with the press 3, thereby achieving high-precision processing.

Thereafter, the positioning piece 30 is lowered, the work W drawn to the front end is sent to the joint conveyor 2, and the rear end is drawn sequentially.

It should be noted that the positioning holes 31 and the positioning pieces 3
If 0 does not match, the press 3 is stopped by detecting the lifting of the pinch roller 27 as described above.

[0031]

As described above, according to the present invention, since the lifting table of the press for moving the upper die up and down is provided with a press-down tool which abuts on the conveyor and presses down the conveying surface directly when descending. In addition, the press and the conveyor can be moved up and down while synchronizing accurately and reliably without any loss time. In addition, since the conveyor moves following the elevating table, the drawing speed can be freely changed, and the process can be easily controlled and high-precision processing can be performed.

Further, since the shock absorber is used as the press-down tool and the air cylinder is used as the linear motion machine of the lifting tool, the impact, vibration, etc., at the time of abutment of the press-down tool or at the time of drawing processing are provided. Can be absorbed and alleviated, and noise can be suppressed and processing accuracy can be ensured.

When the positioning piece that moves upward does not engage with the work and a positioning error occurs, the pinch roller is lifted up through the work. It can detect and prevent processing errors and increase the yield of good products.

[Brief description of the drawings]

FIG. 1 is a front view of an apparatus showing one embodiment of the present invention.

FIG. 2 is an enlarged perspective view showing a main part thereof.

FIG. 3 is a cross-sectional view showing a state during drawing.

FIG. 4 is a cross-sectional view illustrating detection of a position shift by a positioning tool.

FIG. 5 is a perspective view showing an example of a use state of a drawn workpiece.

FIG. 6 is a perspective view showing a drawn workpiece.

FIG. 7 is a perspective view showing a work before drawing.

FIG. 8 is a schematic diagram showing an example of a production line using the apparatus of the present application.

[Explanation of symbols]

 2 Conveyor 2S Conveying surface 3 Press 4 Lifting table 5 Depressor 6 Lifting tool 7 Positioning tool 19 Lower mold 20 Upper mold 27 Pinch roller 29 Work feeder 30 Positioning piece e Workpiece end W Work

Claims (3)

[Claims] An end portion of a long workpiece having a lower conveyor and an upper die mounted on a vertically movable platform that can move up and down. A press forming a squeezed portion, and a lifting tool for pressing down on the transport surface by abutting the transport conveyor at the time of lowering, and the transport surface lowered on the transport conveyor at the original position. And a positioning device having a positioning piece that engages with a workpiece by being movable up and down and moving upward. 2. The conveying and drawing device according to claim 1, wherein said press-down device comprises a shock absorber, and said linear motion machine of said lifting device is an air cylinder. 3. A workpiece feeder having a pinch roller for pressing an upper surface of the conveyed workpiece is provided, and the upwardly moving positioning piece pushes up the workpiece without engaging the workpiece. 3. The conveying squeezing device according to claim 1, wherein the pinch roller is lifted.