JP2739291B2 - Press unit and transfer press using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press unit and a transfer press using the press unit.

[0002]

2. Description of the Related Art In order to automate the processing of a product requiring a multi-step press working, a system in which a plurality of presses are linked by a transfer robot, a progressive feeding method using a roll material, or a transfer method. Presses are commonly used .

[0003] In the robot system, the interval between press devices is increased.
It is not suitable for large parts because it needs to be
For progressive processing using drawing materials for complicated processing such as drawing
There is a problem that cannot be dealt with.
Transfer presses are often used for automation
I have.

FIG. 5 is a plan view showing a main part of a multi-step (specifically, four-step) transfer press. This transfer press has four dies 3a, 3b, 3c, 3d on a frame 2 supported by four columns 1.
The material is supplied from the supply station 4 to the mold 3 a by the feed bar 6 penetrating from the material supply station 4 side to the work discharge station 5, and the work is clamped to the next metal by the work clamp 7 attached to the feed bar 6. Sequentially sent to the molds 3b, 3c, 3d,
The work completed by the mold 3d is discharged to the discharge station 5
It is designed to be discharged from. The feed bar 6 is driven by the transfer device 8, and the position in a state where the work is clamped is indicated by a dotted line in FIG. 5, and the work is supplied to the mold in the next process and retracted from the operation range of the mold. The position in the state is indicated by the solid line.

[0005]

By the way, in the conventional transfer press, the moving range A of the feed bar 6 occupies a considerably large area outside the range of the die, not only the interference with the feed bar 6 but also the die. Since a space for carrying in and maintenance is also required, it is necessary to provide the column 1 for supporting the frame 2 at a location away from the pressurizing point, avoiding the mold maintenance area B. In addition, each mold 3a-3
Since the load of d greatly varies, the frame 2 is required to have rigidity against an eccentric load. For example, it is necessary to take measures such as burying most of the lower frame in the foundation assuming that the frame 2 is composed of the upper and lower frames. is there. For this reason, the frame 2 is enormous and intense, which is one of the causes for increasing the equipment cost, and its effectiveness has not been controversial because it has many achievements but cannot be easily introduced by consumers. Furthermore, conventional transfer presses cannot be made very large due to their rigid structure, and those with a pressing force of 1500 tons and a distance between struts of 6 meters or more are not commercially available to the knowledge of the present inventors. Did not meet.

SUMMARY OF THE INVENTION The present invention has been made in view of such conventional problems, and a transfer press which can be constructed without a large supporting structure and which can be made lighter and cheaper. The purpose of the present invention is to provide a press unit. Another object of the present invention is to provide a transfer press using this press unit.

[0007]

In order to achieve the above object, a press unit according to the present invention forms a portal frame by combining a pair of plates having an opening at a substantially central portion in parallel at a predetermined interval. The distance between the pair of plates is substantially the same as the width in the carrying direction of the mold to be used, and a ram having a width substantially equal to the distance between the plates and facing the opening, and a driving means for the ram. Press unit between the pair of plates above the frame.
A bolster for mounting a mold between the bottoms of the openings.
Side of the bolster facing outward from the opening
The surface is provided with a means for positioning with another press unit .

[0008] The press unit according to the present invention may have a configuration in which reinforcing ribs are protruded from the surfaces of the pair of plates outside the portal frame at different positions.

[0009]

In order to achieve the above object, a transfer press according to the present invention is arranged such that a plurality of any of the above press units are arranged at the same pitch so that each opening communicates linearly with each other. And a work transfer device.

According to the present invention, a transfer press is basically constructed by arranging single presses in parallel. However, in a conventionally known single press, the press is smaller than the width of a die in the transfer direction of a work. Is twice or more, the feed stroke required for transferring the work becomes extremely long, which is not practical. Therefore, it is necessary to use a press having a die width and a press width substantially equal to each other. There has been a C-type press which satisfies this condition, but the C-type press cannot satisfy the precision required as a transfer press, and a large-sized die is required. When it comes to the mold, it is difficult to attach the rear part of the mold (the concave part of the C-type frame) from the front of the mold.

[0012] Therefore press unit of the present invention was substantially equal to the width of the die width and the press in portal frames, as described above, the width of the mold carrying Direction frame to minimize other words, moreover gold In order to configure a press device that does not place a structure at a position that interferes with the loading of the mold or the feed bar,
A portal frame was formed by combining a pair of plates having openings in parallel at predetermined intervals. The connection between the two plates may be performed by mechanical fastening or welding, or both may be used in combination. Of course, a plate having a necessary thickness for strength is adopted.

Further, the press unit having the above-described structure tends to be deformed in a direction perpendicular to the surface of the plate as the size of the mold increases, and the strength becomes insufficient only by increasing the plate thickness. The press unit of the present invention can be provided with reinforcing ribs to compensate for the insufficient strength.However, when configuring the transfer press, the reinforcing ribs of the plates of the adjacent press units do not interfere with each other to increase the width of the press. Next, the positions of the reinforcing ribs are shifted to be different.

In the press unit of the present invention, a hydraulic press or other hydraulic device, or a mechanical press such as a crank press, a crankless press, a link press, a friction press, and a screw press may be used as a drive source of the ram. it can.

Further, in order to constitute a transfer press by using such a press unit, the transferred workpiece must be accurately moved from the center of the mold to the center of the next mold. It is necessary that the press units are arranged at equal intervals on a straight line, the die is aligned with the center of the press unit, and the directions are also correctly aligned. Therefore, in the press unit of the present invention, a bolster for mounting a mold is arranged between the bottom sides of the opening, and means for positioning with another press unit, such as a keyway and a pin, are provided on the side of the bolster facing outward from the opening. Is provided. For this purpose, the press unit may be arranged on a common base.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. In the following, description will be made by assigning common reference numerals to parts common to the related art.

FIG. 1 is a plan view showing one embodiment of a transfer press constituted by a press unit according to the present invention. This apparatus also has four molds 3a, 3b, 3c and 3d, and a feed bar 6 runs between the supply station 4 and the discharge station 5, and has basically the same configuration as the apparatus of FIG. I have. In this apparatus, one press unit 10 corresponds to one die, and a die maintenance area C is also divided for each die. In FIG. 1, the press units are also denoted by reference numerals 10a to 10d in correspondence with the dies 3a to 3d.

FIGS. 2 and 3 show the press unit 10 of FIG.
Is shown. The press unit 10 includes a pair of plates 12 and 12 made of a thick plate having a square opening 11 in the center.
Are fixed to each other at predetermined intervals while keeping the blocks 13 parallel with each other to form a portal frame. The plate 12 and the block 13 may be fixed by welding, but a large-sized machine tool is required to perform machining after welding. Therefore, the plate 12 and the block 13 are connected and fixed by bolts 14 in the illustrated example.

A bolster 15 is provided between the lower edges of the openings 11, 11 of the plates 12, 12. A cylinder 17 is provided. The piston 18 of the hydraulic cylinder 17 forms a sealed oil chamber 20 by a cylinder tube portion in the ram 19 to generate a pressing force, and drives the ram 19 by the generated downward pressing force. The ram 19 is the plate 12,
The bolster 15 is guided only in the vertical direction by a guide 21 provided on the inner surface of the bolster 15 and is driven in a state parallel to the upper surface of the bolster 15. That is, since a large moment or the like is not generated in the plate 12 constituting the frame, the size of the frame is smaller than that of the conventional device. Further, since the ram 19 is driven for each press unit 10 instead of performing a large number of processings with a single drive source as in the conventional transfer press, the moving amount required for each mold is reduced. In this case, the strokes may be individually adjusted, and the efficiency may be increased by adjusting the stroke so that the maximum pressing force is not generated at the same time.

The upper and lower molds are fixed to the top surface of the bolster 15 and the bottom surface of the ram 19, and the material is processed between the dies as the ram 19 moves up and down. Therefore, the plates 12, 1
The interval 2 may be the same as the width of the mold in the transfer direction of the work or slightly larger as shown in FIG.

A key groove 22 is provided on a side surface of the bolster 15 facing the opening 11 so that a key can be used for positioning with an adjacent press unit. Of course, the pin holes for positioning the mold are also formed on the upper surface of the bolster 15 (not shown), and the interval between the centers of the molds is determined by the machining of the bolster. Processing can be performed with high precision so as to be aligned on a straight line.

In order to increase the number of processes, that is, to increase the number of dies, it is only necessary to increase the number of press units 10 to be connected. Therefore, an apparatus corresponding to a large-sized transfer press, for example, with a pressing force of 1500 tons and a distance between columns of 6 meters or more can be configured in principle without any restriction only by increasing the number of press units 10 to be connected. Further, not all the molds 3a, 3b, 3c and 3d are necessarily used, but it is also possible to form different parts while using the same mold so as not to perform the processing in the press unit 10 in a certain process. it can. For example, by selectively performing the operation of the press unit 10 in the punching step, a part with holes and a part without holes can be easily formed.

FIG. 4 is a plan view showing another embodiment of the transfer press constituted by the press unit according to the present invention. The configuration of the present embodiment is the same as the configuration of the previous embodiment except that the frame structure of the press unit 30 is slightly different. Therefore, only the different configuration will be described below. The press unit 30 of this embodiment (the molds 3a to 3
The press units are also denoted by reference numerals 30a to 30d in correspondence with 3d).
It is used when it is considered that the deformation amount is too large if only the plates 12, 12 are used. Ribs 31a, 31b for reinforcement are provided on the outer surface of the plate 12. These ribs 31a and 31b are arranged on the left rib 31 so as not to interfere with the ribs of the adjacent press unit 30.
a is welded to the outside and the right rib 31b is welded to the inside.
In order to accurately determine the distance between the centers of the molds, a common base 32 is used, and a reference hole is formed thereon, thereby reducing the assembling work and facilitating restoration work.

[0024]

As described above, the press unit according to the present invention forms a portal frame by combining a pair of plates provided with openings in parallel, and mounts the ram and its driving means between the plates. Between the bottom of the opening
Side facing outward from the opening of the bolster for mounting the mold
In addition, the positioning means for the other press units is provided , so that the width of the work in the transfer direction can be configured to be substantially the same as the width of the mold, and it can be manufactured at a light weight and at a low cost. Not only has the effect of being able to
Can accurately locate the center of the mold in the press unit
It can be easily done, so multiple presses
Units are centered and arranged at equal intervals on a straight line
Transfer press can be configured easily.
There is an effect that .

Since the transfer press according to the present invention is constituted by arranging a plurality of the above-mentioned press units in parallel, the following many effects can be obtained. (A) Not only can it be made lighter than conventional frame structures, but also material costs, processing costs, assembly costs, customer restoration work costs, etc. can all be reduced, and equipment costs are reduced to a fraction of those of conventional equipment. it can. (B) In the conventional transfer press, it was structurally impossible to increase the number of stations, but in the transfer press of the present invention, the number can be easily increased and expandability is increased. (C) Just by arranging the press units, the size can be increased without any restriction in principle. (D) Since a large moment or the like is not generated in the frame of each press unit, a large one is unnecessary, and the frame can be reduced in size as compared with a conventional transfer press having the same pressing force. (D) Higher efficiency can be achieved by adjusting the amount of ram movement of the press unit corresponding to each mold. (E) Since the force applied to the frame of each press unit is well-balanced, unlike the conventional transfer press, which receives basically unbalanced force, the upper die and lower die of the mold are misaligned. Is less likely to occur and the accuracy is improved. (F) Different parts can be formed while using the same mold by not operating some of the plurality of press units.

[Brief description of the drawings]

FIG. 1 is a plan view showing one embodiment of a transfer press constituted by a press unit according to the present invention.

FIG. 2 is a perspective view of the press unit shown in FIG.

FIG. 3 is a central vertical end view of the press unit shown in FIG. 1;

FIG. 4 is a plan view showing another embodiment of the transfer press constituted by the press unit according to the present invention.

FIG. 5 is a plan view showing a main part of a conventional transfer press.

[Explanation of symbols]

3a, 3b, 3c, 3d Mold 4 Supply Station 5 Discharge Station 6 Feed Bar 10, 10a, 10b, 10c, 10d Press Unit 11 Opening 12 Plate 13 Block 15 Bolster 17 Hydraulic Cylinder 18 Piston 19 Ram 20 Oil Chamber 21 Guide 22 Key Groove 30, 30a, 30b, 30c, 30d Press unit 31a, 31b Rib 32 Common base C Mold maintenance area

Claims (3)

(57) [Claims] 1. A portal frame is formed by combining a pair of plates having an opening at a substantially central portion in parallel at a predetermined interval, and adjusting the interval between the pair of plates in a direction in which a mold to be used is carried in. A press unit which has a width substantially equal to the width of the plate, and a ram having a width substantially equal to the interval between the plates and facing the opening, and a driving means for the ram, mounted on the upper portion of the frame between the pair of plates . , arranged bolster for mold mounted between the bottom of the opening, the upper
The other side of the bolster facing outward from the opening
A press unit comprising a positioning unit for positioning the press unit. 2. The press unit according to claim 1, wherein reinforcing ribs are provided so as to protrude from the surfaces of the pair of plates outside the portal frame at different positions. 3. The press unit according to claim 1, wherein
Multiple openings at the same pitch so that each opening communicates linearly
In the opening of these press units.
Transfer characterized by arranging a transfer device of
press.