JPH08141793A - Multihead hydraulic press with rotary table - Google Patents

Abstract

PURPOSE: To eliminate unbalanced load by arranging lower dies on a rotary table in the number of press processes, stopping them sortedly on a molding stage position, arranging a hydraulic cylinder in the over part of each of this molding stage and concentrically positioning the molding load center with the output generating center. CONSTITUTION: A lower die 16 is arranged on the circumference of the prescribed radius of a rotary table 15 in accordance with a plurality of molding stages; the lower die 16 is provided on each molding stage through an index device 10 so as to be successively moved, sorted and stopped; and a hydraulic cylinder 20 is each arranged on the cylinder frame 6, which is provided corresponding to the over side of a table frame 5, in a position corresponding to each lower die 16 that is sorted and stopped on each molding stage. These hydraulic cylinders 20 are each provided so as to be capable of pressure molding by a motion control pattern in accordance with the press molding of each molding process, and also with the output generating center of the cylinder 20 provided concentrically with the molding load center of the lower die 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-head hydraulic press device having a rotary table for forming a molded product which requires multiple steps.

[0002]

2. Description of the Related Art Conventionally, a press-molded article molded through a plurality of steps is arranged, for example, by arranging a plurality of press apparatuses for each step and arranging a transfer device such as a robot between each step. It was transported and molded by a transfer press. However, in these products, it takes time to carry in and carry out between each process and to attach and detach the work, resulting in a large number of man-hours for the product, which results in high cost. There is a problem that requires a lot of
A press forming apparatus having a rotary table of Japanese Patent No. 84638 has been developed. In the press molding apparatus disclosed in this publication, a rotary table is arranged in one hydraulic press, and a die having a number of pressing steps is arranged at a predetermined angular interval around the circumference of the rotary table. It is configured so that molding is performed by feeding materials and sequentially rotating by one press slide.

[0003]

However, the molding load in each step of molding a molded product is not uniform. Therefore, when molding each step by one press slide at a time, the center of rotation of the rotary table and the slide are When the load centers of 1 are arranged in the same manner, an eccentric load is generated on the slide, which causes variations in product accuracy and a problem in durability of the device.

The present invention has been made in order to solve the above-mentioned conventional problems. A lower die having the number of pressing steps is arranged on a rotary table, and the indexing is stopped at the forming stage position. Provided is a multi-head hydraulic press device having a rotary table in which a hydraulic cylinder is arranged above the stage and a molding load center and an output generation center are concentrically arranged so that a problem caused by an eccentric load can be eliminated. The purpose is to do.

[0005]

In order to solve the above technical problems, the present invention provides a rotary table rotatably on an upper surface side of a table frame of an apparatus frame through an index device, and a rotary table in the table frame. A molding stage with the number of molding steps that pressure-molds a work at equal angular positions around the same rotation center of the table, a carry-in stage that carries in the work and sets it in the lower mold, and a carry-out stage that knocks out the molded product. And the lower die on the circumference of a predetermined diameter of the rotary table at equiangular positions corresponding to these stages, and the lower die is moved through the index device. In a press machine that can be moved and indexed sequentially,
A hydraulic cylinder is provided in a cylinder frame provided corresponding to the upper side of the table frame at a position corresponding to each lower die indexed and stopped at each molding stage, and each hydraulic pressure is The cylinder is set so that it can be pressure-molded by an operation control pattern according to the pressure molding in each molding process, and the rotary table is configured such that the molding load center of the lower mold and the output generation center of the hydraulic cylinder are concentric. It is a multi-head type hydraulic press device having.

[0006]

[Operation] By disposing hydraulic cylinders corresponding to the respective lower dies stopped on the respective molding stages and concentrating the center of the molding load and the center of output generation, it is possible to eliminate variations in product accuracy due to eccentric loads. it can.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front view of a multi-head hydraulic press device (hereinafter simply referred to as press device) 1 having a rotary table, and FIG. 2 is a table frame. 5 is a plan view of the cylinder frame 6, and FIG. 3 is a bottom view of the cylinder frame 6.
Are vertical frames 3 and 4 having rigidity on the left and right of the base base 2.
The table frame 5 is horizontally installed at a predetermined height position of the left and right vertical frames 3 and 4, and the cylinder frame 6 is horizontally installed at a predetermined height position from the table frame 5. The lower table frame 5 is provided with a rotary table device 7, and the upper cylinder frame 6 is provided with a plurality of hydraulic cylinders 20.

The rotary table device 7 comprises a drive unit 8 arranged on the lower surface side of the table frame 6 and a rotary table 15 arranged on the table frame 6 and rotated by the drive unit 8. The drive unit 8 is composed of, for example, a drive motor 9 attached to the vertical frame 3 and an index device 10 provided at a predetermined center position of the table frame 6. The index device 10 is a speed reducer including a clutch, a brake, and a speed reducer as one unit. It is composed of a control unit 11 and a roller gear type index unit unit 12. The input shaft of the deceleration control unit 11 is connected to the rotary shaft of the drive motor 9 via, for example, a drive chain system 13.
Further, a rotary table 15 is attached to the rotary shaft (output shaft) 14 of the roller gear index unit portion 12, and the rotary table 15 is provided so as to be indexed and stopped via the index unit portion 12.

The rotary table 15 is formed in a disk shape having a predetermined wall thickness and a predetermined diameter. The rotary table 15 is indexed and stopped at a plurality of positions through the index device 10. The product molded by the device 1 is, for example, molded in 5 steps,
Therefore, the indexing stop position of the rotary table 15 by the index unit portion 12 is, as shown in FIG. 2, a work-carrying-in stage S1 and a first forming stage P1 for the work sequentially in the rotating direction (clockwise direction) of the rotary table 17. , Second molding stage P2, third molding stage P3
, The fourth molding stage P4, the fifth molding stage P5, the carry-out stage S2, and the standby stage S0 are set so as to be indexed and stopped at equiangular positions around the rotary shaft 14, and the rotary shaft 14 of the rotary table 15 A lower die 16 is erected at an angular interval of each stage S1 to S0 on a circumference R having a predetermined radius centered at.

At the positions of the respective stages S1 to S0 of the table frame 5, a guide member 17 which also serves to prevent the rotary table 15 from rising is disposed. Also,
On the side of the base 2 of the carry-out stage S2, the carry-out stage S
A knockout cylinder 18 for taking out a molded product is provided in alignment with the center of the lower mold 16 located at 2. On the cylinder frame 6 on the upper side of the rotary table 15 provided in this way, as shown in FIG. 3, a hydraulic cylinder 20 is arranged corresponding to the first molding stage P1 to the fifth molding stage P5.

Each of the hydraulic cylinders 20 is arranged with the piston rod 21 facing downward, and the axial center C2 (center of output generation) of the piston rod 21 is indexed and stopped at each molding stage P1, P2. The piston rod 21 is mounted on the cylinder frame 6 so as to be concentric with the center C1 (center of molding load) of the lower die 16, and as shown in FIG.
A slide 22 is horizontally attached to the tip side of the piston 22, and piston rods 21 are provided at both ends of the slide 22 at predetermined intervals.
Guide rods 23a and 23b also serving as rotation stoppers are provided, the guide rods 23a and 23b are respectively inserted into the guide holes 6a of the cylinder frame 6, and the upper die 24 is detachably attached to the rod center of the slide 22. Has been. Further, the dog 25 is attached to the upper end of the one guide rod 23b, and each step S1
Detection rods 26 are provided at predetermined intervals on the guide rods 23b of the hydraulic cylinders 20 to S5.

The detection rod 26 is mounted (not shown) on the press device 1 side and is installed to face each guide rod 23b at a predetermined interval. The detection rod 26 controls the position of the slide 22. At the upper and lower predetermined positions, for example, an L-shaped limit switch LS1 for detecting the top dead center of the slide 22 and an L-shaped limit switch LS2 for detecting the bottom dead center are fixed, and the upper and lower limit positions are detected. Limit switch LS for decelerating the slide 22 to the upper side between the limit switches LS1 and LS2
a and an arbitrary lower limit limit switch LSb for detecting the arbitrary lower limit position of the slide 22 are provided on the lower side so as to be position adjustable, and each limit switch LS1, LS2, LSa,
The roller lever of LSb faces the moving path of the dog 25, and the bottom dead center of the slide 22 is detected by an arbitrary lower limit switch LSb and a pressure switch (not shown) arranged in the hydraulic circuit of the hydraulic cylinder 20. It

In the detection rod 26 of each of the steps S1 to S5 thus provided, the positions of the deceleration limit switch LSa and the arbitrary lower limit switch LSb are adjusted according to the press forming in that step. 5 shows an operation control diagram of the hydraulic cylinder 20 in a certain process, in which the vertical axis represents the stroke of the slide 22 and the horizontal axis represents time. When it is descended at high speed, the guide rod 23a,
23b is also moved together, and the dog 25 attached to the end of the guide lot 23b on the slide 22 with a predetermined stroke St1 operates the deceleration limit switch LSa in contact.
Then, the descending speed of the slide 22 is decelerated on the hydraulic circuit side by the signal from the deceleration limit switch LSa to switch to a predetermined molding pressurizing speed, and the work is press-molded. Then, a predetermined stroke position S where pressure molding is performed after a predetermined time has elapsed from the position of the stroke St1
When the position of t2 is reached, the dog 25 contacts the arbitrary lower limit switch LSb. As a result, the hydraulic circuit is switched by the signal of the arbitrary lower limit switch LSb and the signal of the pressure switch, and the slide 22 is raised at high speed. The operation control pattern shown in FIG. 5 is set according to the molding in each of the steps S1 to S5.

A work carry-in device 30 is provided on the carry-in stage S1 side, and a product carry-out device 31 is provided on the carry-out stage S2 side.

In the press apparatus 1 of the present embodiment provided as described above, first, the work is carried in by the carry-in device 30 and set on the lower die 16 which stands by at the carry-in stage S1. The index device 10 is actuated based on the work set signal, the rotary table 15 is rotated clockwise in the drawing, and the lower die 16 on which the work is set is indexed and stopped on the next first molding stage P1. At the same time, the lower mold 16 that is on standby at the standby stage S0 is the loading stage S.
Stopped at 1. Then, based on the confirmation signal that the lower mold 16 is stopped by the first molding stage P1, the hydraulic cylinder 20 arranged on the first molding stage P1 is set to the first molding stage P1. The work is pressure-formed by being operated according to the control pattern. In the molding process in the first molding stage P1, the work is set by the carry-in device 30 in the lower mold 16 located in the carry-in stage S1.

Then, the index device 10 is actuated in response to the set signal of the work and the molding completion signal of the first molding stage P1, and the lower molds 16 are moved from the loading stage S1 to the first molding stage S1 to the first molding stage S1. Indexing is stopped from the molding stage to the second molding stage P2, and each hydraulic cylinder 20 is pressure-molded based on the operation control pattern set for each stage P1 to P5 based on the stop confirmation signal. As described above, when the workpiece carry-in set, the indexing device 10 for each process, the indexing stop to each stage, and the pressure molding by the hydraulic press 20 are sequentially performed and the molded product reaches the carry-out stage S2, the carry-out stage is carried out. Knockout cylinder 1 arranged below S2
8 is operated and the molded product of the lower mold 16 is ejected and is carried out of the device 1 by the carry-out device 31. After that, the work pieces are sequentially carried into the carry-in stage S1 and set to the respective molding stages P1 to P5, stopped, and pressure-molded by the hydraulic press 20 in each molding stage to be carried out from the carrying stage 31. The operation of the index device 10 is set so as to operate upon receipt of a molding completion signal from each of the molding stages P1 to P5.

As described above, in the press apparatus 1 of this example,
A rotary table 15 is rotatably provided on the upper surface side of the table frame 5 of the apparatus base frame via an index device 10, and a work is added to the table frame 5 at an equiangular position around the rotation of the rotary table 15 about the same rotation center. Molding stage P1, which has the number of molding steps for pressure molding
P2, P3, P4, P5, a carry-in stage S1 for carrying in a work and setting it on the lower die 16, a carry-out stage S2 for knocking out a molded product, and a waiting stage between the carry-in stage S1 and the carry-out stage S2. S0 is arranged, and on the circumference of the rotary table 15 of a predetermined diameter, the lower mold 16 is provided at equiangular positions corresponding to these stages S1, P1, P2, P3, P4, P5, S2 and S0. Is provided so that each lower die 16 can be sequentially moved and indexed and stopped through the index device. Particularly, the cylinder frame 6 provided corresponding to the upper side of the table frame 5 has the above-mentioned structure. A hydraulic cylinder 20 is disposed at a position corresponding to each lower die 16 that is indexed and stopped at each molding stage P1, P2, P3, P4, P5, and each hydraulic cylinder 20 is connected to each molding stage P1.
~ P5 is set to enable pressure molding by the operation control pattern corresponding to the pressure molding, and the molding center C1 of the lower mold 16, that is, the molding load center C1 and the center C2 of the hydraulic cylinder 20, that is, the output generation center C1. Is concentrically configured.

Therefore, each stage S of each lower die 16
The movement / indexing stop for 1, P1, P2, P3, P4, P5, S2, S0 is highly accurately indexed and stopped by the indexing device 10, so that especially the forming stages P1, P2, P3, P4, P
The molding center C1 (center of molding load) of each lower die 16 stopped at 5 can be accurately positioned with respect to the center C2 (center of output generation) of the hydraulic cylinder 20 on the upper side.
Each of the hydraulic cylinders 20 has an independent slide 22 according to the operation control pattern corresponding to the pressure molding in each molding process.
Since an unbalanced load does not occur even if the applied pressure in each process is different, the precision of the molded product can be ensured and the durability of the press machine 1 can be ensured. . In the above embodiment, the molding stages P1, P2, P3, P4, P5 are illustrated as five stages, but the present invention is not limited to this, and is set according to the number of steps of the molded product, and the total number of stages is It is set by the number of processes + 2 to 3 (loading / unloading stage + standby stage), and this standby stage is set as needed. It may not be.
The indexing position of the index device 10 is also set based on the number of stages.

[0019]

Since the present invention is configured as described above, since the movement / indexing stop of each lower die with respect to each stage is accurately stopped by the indexing device, The center of the forming load of each lower die stopped on the forming stage can be accurately positioned with respect to the center of output generation of the upper hydraulic cylinder, and each hydraulic cylinder can be used for pressure forming in each forming process. Since each slide is independently controlled by a corresponding operation control pattern, even if the pressing force in each process is different, an unbalanced load does not occur, so that the precision of the molded product can be secured, and The durability of the multi-head hydraulic press device can be ensured, and press molding can be performed efficiently.

[Brief description of drawings]

FIG. 1 is a front view of a multi-head hydraulic press device having a rotary table.

FIG. 2 is a plan view of a rotary table.

FIG. 3 is a bottom view of a hydraulic cylinder arranged on a cylinder frame.

FIG. 4 is a correspondence diagram of a hydraulic cylinder and a detection rod.

FIG. 5 is an explanatory diagram of an operation control pattern based on a hydraulic cylinder and a detection rod.

[Explanation of symbols]

 1 Multi-head type hydraulic press device 5 Table frame 6 Cylinder frame 10 Indexing device 15 Rotary table 16 Lower mold 20 Hydraulic cylinder P1, P2.P3, P4, P5 Forming stage S1 Carrying stage S2 Carrying stage S0 Standby stage

Claims (1)

[Claims] 1. A rotary table is rotatably provided on an upper surface side of a table frame of an apparatus frame via an indexing device, and a work is placed on the table frame at equiangular positions about the same rotation center of rotation of the rotary table. A molding stage with the number of molding steps for pressure molding,
A carry-in stage that carries in the work and sets it in the lower mold,
Arranged with a carry-out stage that knocks out the molded product,
Further, lower molds are arranged at equal angular positions corresponding to these stages on the circumference of a predetermined diameter of the rotary table, and the lower molds are sequentially moved / indexed and stopped through the index device. In a press device that can be installed, hydraulic cylinders are arranged in positions corresponding to the lower dies that are indexed and stopped by the molding stages, respectively, in the cylinder frame provided corresponding to the upper side of the table frame. This hydraulic cylinder is set to enable pressure molding by an operation control pattern according to the pressure molding in each molding process, and the center of the molding load of the lower mold and the center of output generation of the hydraulic cylinder are set. A multi-head hydraulic press machine with a rotary table with concentric structure.