JP3910514B2 - Cushion device for press machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cushion device for a press machine that controls a pressing pad provided on a mold when press-molding a workpiece.
[0002]
[Prior art]
A conventional cushion device for a press machine uses an elastic body (see, for example, Patent Document 1).
Some use hydraulic pressure and an elastic body (see, for example, Patent Document 2).
Furthermore, there are some that use fluid such as hydraulic pressure (for example, see Patent Document 3).
[0003]
[Patent Document 1]
JP-A-8-90096 (page 3, FIG. 1)
[Patent Document 2]
Japanese Patent Laid-Open No. 7-24600 (2nd page, FIG. 1)
[Patent Document 3]
Japanese Examined Patent Publication No. 6-61640 (Page 6, Fig. 1)
[0004]
The above Patent Documents 1, 2, and 3 will be described in detail with reference to the drawings.
FIG. 9 is an explanatory view of a conventional press apparatus (a copy of FIG. 1 of Patent Document 1).
In a conventional press apparatus, a pad pressure adjusting means 3 in which an elastic body 2 capable of adjusting pressure is arranged is attached to a holder 1 of a press machine (the symbol is the same as that described in the same publication). The pressure transmission body 18 made of a rod is provided between the elastic body 2 and the pad 13, and the pad pressure can be individually set by replacing the elastic body 2 with the elastic body 2 set to a different pressure. In addition, the upper die can be made smaller by the amount that the elastic body of the upper die 4 is unnecessary.
[0005]
FIG. 10 is an explanatory view of a conventional hydraulic die cushion device (a copy of FIG. 1 of Patent Document 2).
In the conventional hydraulic die cushion device, a die cushion pad 1 is provided in a press bed 2, piston rods 3 a and 3 a of cushion cylinders 3 and 3 are connected below the die cushion pad 1, and a main body is attached to the bed 2. A piston rod 5a of a pad raising cylinder 5 is connected between the cushion cylinders 3 and 3 and below the die cushion pad 1, and the main body is attached to the bed 2. These cushion cylinders 3, 3 and the pad raising cylinder 5 By moving the die cushion pad 1 up and down, a cushion action can be imparted to the lower blank holder on the bolster 24 via the cushion pin 25.
[0006]
FIG. 11 is an explanatory view of a conventional cushion device (a copy of FIG. 1 of Patent Document 3).
A conventional apparatus for absorbing the movement of the members of the press is used when the workpiece 12 is formed by the punch 14 of the press 10, and the cushion assembly 28 (cylinder 36, The piston 38) and the cushion assembly 28 absorbs the movement of the punch 14 and the workpiece 12. The cushion assembly 28 can also be used to absorb the movement of a mold member not shown.
[0007]
[Problems to be solved by the invention]
In the press apparatus of FIG. 9 described above, since the pad pressure is set by the elastic body 2, it is necessary to prepare a large number of elastic bodies 2 having pressures individually set, and the purchase cost increases.
Further, if a large number of elastic bodies 2 with individually set pressures are prepared, it takes time to store and manage the elastic bodies 2.
[0008]
In the hydraulic die cushion device of FIG. 10 described above, when the lower mold on the bolster 24 is replaced, the position of the cushion pin 25 may not match the position of the blank holder or the like depending on the configuration of the replaced lower mold, and connection may not be possible. Yes, it is difficult to improve the versatility of the die cushion device. As a result, it is necessary to provide a hydraulic die cushion device corresponding to the lower mold each time, and the production cost increases.
[0009]
The cushion assembly 28 shown in FIG. 11 can be used like the elastic body 2 with respect to a mold, for example, the upper mold of FIG. 9, but the manifold plate 26 to which the cushion assembly 28 is attached has a chamber 32 (flow Road) must be formed. When each cushion assembly 28 is used at different pressures, a plurality of flow paths are required so that fluids of different pressures can be supplied. Especially when the mold is large, it is troublesome to process the flow paths. It takes. For example, the depth of the flow path (hole) that can be processed with a cutting tool such as a normal drill is limited because the length (L / D) of the drill is limited. When the depth of the hole is 4000 mm, the plate is divided into small parts that can be machined with a drill, and a flow path is formed in the divided plates. Thereafter, the divided plates are combined to obtain a 4000 mm flow path. It takes time to form the film, and the production cost increases.
[0010]
Therefore, an object of the present invention is to provide a cushion device for a press machine that reduces production costs and improves versatility with respect to a mold having different pressing pads.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, in claim 1, in a press machine in which a cushion device is attached to a holder of a press machine and a pressing pad is attached to the cushion device, the cushion device arranges a plurality of tubes in parallel. Pour hot water so as to enclose the tube, and make a number of cylinder holes in the cast base obtained by this so that a part of the tube is notched, and fit pistons into these cylinder holes respectively, and cylinder holes through the tubes It is a multi-cylinder assembly structure capable of operating the piston and controlling the pressing force of the pressing pad by supplying pressurized air or pressurized oil to the cylinder.
[0012]
The cushion device uses a casting base obtained by arranging a plurality of tubes in parallel and casting them. A channel having a length corresponding to the tube can be opened without using a cutting tool such as a drill, and compressed air or pressurized oil can be supplied to the cylinder hole by the cast tube. As a result, it does not take time to form a flow path for supplying pressurized air or pressurized oil to the cylinder hole.
[0013]
In addition, the cushion device has a cylinder base in which a plurality of tubes are cast, and a plurality of cylinder holes are formed so that a part of the tube is notched, and a piston is fitted into each of these cylinder holes. A multi-cylinder assembly structure that can control the pressing force of the pressing pad by supplying compressed air or pressurized oil to the hole, so it is currently in use for an upper mold with a pressing pad different from the current upper mold Different pressing pads can be operated by using a piston different from that of the piston, and versatility with respect to each mold having different pressing pads is improved.
[0014]
According to a second aspect of the present invention, a half cylinder closed only at one end of the cylinder is fitted into the cylinder hole, and a piston is fitted into the half cylinder.
The assembly work is completed simply by installing the cylinder unit assembled with the half cylinder and piston. Therefore, the production efficiency can be improved.
Further, since the half cylinder is fitted in the cylinder hole, it takes less time to form the cylinder wall, and the working time can be reduced.
[0015]
A third aspect of the present invention is characterized in that the pressure can be controlled for each tube by providing a pressure control means for each of the plurality of tubes.
Since the output of the piston provided for each tube can be controlled, the pressing force of the pressing pad can be controlled. That is, it takes less time to change the pressing force of the pressing pad, the production cost can be reduced, and versatility with respect to a mold having different pressing pads is further improved.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
FIG. 1 is a first explanatory view of press molding using a cushion device according to the present invention. First, the cushion device 12 and the mold 13 are attached to the press machine 11. Specifically, the cushion device 12 is attached to the holder 14 of the press machine 11, the upper die 15 of the molding die 13 is attached to the cushion device 12, and the lower die 17 is attached to the bed 16 of the press machine 11. Next, the work 18 is set at a predetermined position of the lower mold 17, pneumatic pressure is supplied to the cushion device 12, and the pressing pad 21 of the upper mold 15 is projected as indicated by a two-dot chain line.
[0017]
FIG. 2 is a second explanatory view of press molding using the cushion device according to the present invention.
The press pad 21 of the upper die 15 is held in a protruding state by the air pressure supplied to the cushion device 12, and the cushion device 12 and the entire upper die 15 are lowered integrally by the press machine 11. 18 is pressed with a predetermined pressing force F1 as shown by the arrow (1).
[0018]
FIG. 3 is a third explanatory view of press molding using the cushion device according to the present invention.
After the workpiece 18 is previously pressed by the pressing pad 21 with the predetermined pressing force F1 as indicated by the arrow (1), the upper die 15 is further lowered and the workpiece 18 is formed into a predetermined shape by the die 24. At that time, the pressing pad 21 maintains a predetermined pressing force F1 by the cushion device 12 while returning in synchronization with the lowering speed of the upper mold 15.
[0019]
The cushion device 12 forms a cast base 31 to be attached to the press machine 11, and casts a tube 32... (... indicates a plurality. The same applies hereinafter) into the cast base 31, and pressure is applied to the end of the tube 32. Control means 34 are provided, cylinder holes 36 are opened so as to communicate with the tube 32, and pistons 36a or blind plugs 39 are fitted into the cylinder holes 36, respectively. It is a thing.
Next, the cushion device 12 will be described in detail.
[0020]
4 is a plan view of the cushion device 12 as viewed from the direction of arrow 4 in FIG. 3, and includes a casting base 31, tubes 32, pressure control means 34, cylinder holes 36, and the like. Pistons 36a ... and blind plugs 39 ... are shown. Reference numerals 37 ... indicate base mounting bolts, and 38 ... indicates upper mold mounting holes.
The medium for operating the piston 36a is compressed air (pneumatic pressure), but pressure oil (hydraulic pressure) may be employed.
[0021]
Here, assuming that the tubes 32... Are T1 to T6 and the cylinder holes 36 are h1 to h19, respectively, here, in the area B corresponding to the upper pressing pad 21 (see FIG. 3). Pistons 36a ... (T5, h7-13) and pistons 36a ... (T6, h7-13) are used.
[0022]
The number of upper pressing pads is not limited to only one pressing pad 21 (see FIG. 3), but is arbitrary. For example, when the pressing pad A and the pressing pad C not shown are provided so as to correspond to the areas A and C, the piston 36a (T3, h5) and the piston 36a (T4, h5) shown in the area A are used. The piston 36a (T1, h15) and the piston 36a (T2, h15) shown in the area C are used. Then, blind plugs 39 are attached to the remaining cylinder holes 36.
[0023]
The pressure control means 34 includes a valve 41, a pressure control valve 42, a pressure gauge 43 (see FIG. 3), a direction control valve 44, and a flow rate control valve 45, and the pressure control valve 42 opens the cylinder hole 36. The pressure of the supplied pneumatic pressure is controlled, the direction control valve 44 is controlled based on information from a control panel (not shown), and supply to the tube 32 not used by the valve 41 is stopped. Reference numeral 46 denotes a pneumatic pump unit.
[0024]
Here, when the pressure control means 34... Are C1 to C6, the conditions such as the pressure P2 of the piston 36a... Of the second pressing pad 21 (see FIG. 3) by the pressure control means 34, 34 of C5 and C6. The pressure control means 34, 34 of C3 and C4 control conditions such as the pressure P1 of the pistons 36a, 36a of the pressing pad A, and the pistons 36a of the pressing pad C are controlled by the pressure control means 34, 34 of C1, C2. Control conditions such as pressure P3 of 36a.
[0025]
FIG. 5 is a cross-sectional view of a casting base according to the present invention, in which a cylinder hole 36 formed so as to cut out a part of the tube 32 and six tubes 32. A casting base 31 is shown in which tubes 32... Are cast into a length L and a width W.
[0026]
As the material of the cast base 31, for example, spheroidal graphite cast iron (symbol FCD550) or gray cast iron (symbol FC300) is employed.
The length L of the casting base 31 is 4500 mm, for example.
The width W of the casting base 31 is 2200 mm, for example.
[0027]
The tube 32 is, for example, a steel pipe. Specifically, a carbon steel pipe for piping (symbol SGP (black pipe)) or a carbon steel pipe for pressure piping (symbol STPG) is used, but other pipes may be used.
Here, the inner diameter of the tube 32 was selected to be about 95 mm.
[0028]
Next, the operation of the cushion device for the press machine described above will be described.
As shown in FIG. 5, the cushion device 12 has six tubes 32... Arranged in parallel, poured such that these tubes 32 are cast, and the tube 32 is placed on the casting base 31 obtained thereby. Since the cylinder hole 36 is communicated so that a part of the cylinder is notched, a flow path having a length L (4500 mm) corresponding to the tube 32 can be opened without using a cutting tool such as a drill, and Pneumatic pressure can be supplied to the cylinder hole 36 through the tube 32. As a result, it takes less time to form a flow path for supplying pneumatic pressure to the cylinder hole 36, and the production cost can be reduced.
[0029]
As shown in FIG. 4, the cushion device 12 has a plurality of tubes 32 arranged in parallel, and a part of the tube 32 is notched in a casting base 31 in which these tubes 32 are cast. A plurality of cylinder holes 36... Are fitted into the cylinder holes 36... And the compressed air is supplied to the cylinder holes 36 through the tubes 32. Since it is a multi-cylinder assembly structure that can be operated to control the pressing force of the pressing pad 21 and, for example, the pressing pads A and C, the upper mold 15 has a different pressing pad from the upper mold 15 (see FIG. 1). , A piston 36a... Different from the piston 36a... Used for the press pad 21 and the press pads A and C, for example, a piston 36a (not shown in the center figure) 4, h9) can actuate the pads pressing using, it is possible to improve the versatility with respect to the mold with different holding pad.
[0030]
As shown in FIG. 4, the pressure control means 34 is provided in each of the six tubes 32... So that the pressure can be controlled for each tube 32. Therefore, the pressure of the piston 36a is changed. However, it is possible to reduce the production cost and to improve the versatility of the mold having different pressing pads.
[0031]
Next, another embodiment of a cushion device for a press machine according to the present invention will be described.
FIG. 6 is a diagram showing another embodiment. The same components as those in the embodiment shown in FIG. 1 to FIG.
The cushion device 12B according to another embodiment has a cylinder unit 50 attached to a cylinder hole 36B.
The cylinder hole 36 </ b> B is a hole that is continuous with the tube 32 in a T shape, and has a female screw 47 and a seat surface 48.
The pneumatic pressure supplied by the tube 32 passes through the lower part of the cylinder hole 36B and flows in from the inlet 51 of the cylinder unit 50 as shown by the arrow (4), and operates the cylinder unit 50 for the maximum stroke S as shown by the two-dot chain line. .
[0032]
The cylinder unit 50 is a pneumatic cylinder, and includes a half cylinder 52 that is closed only at one end of the cylinder, a piston 53 (see FIG. 7) that slides within the half cylinder 52, and a rod 54 that is connected to the piston 53. 55 denotes a male screw, and 56 denotes a first seal.
[0033]
FIG. 7 is a cross-sectional view of a half cylinder and a piston according to another embodiment. The half cylinder 52 is closed only at one end of the cylinder, the cylinder wall 52a, the piston 53, the rod 54, the male screw 55, and the first seal 56. 2nd to 4th seals 57, 58, 59, a first wheel member 61 for stopping the second seal 57, and a second wheel member 62 for stopping the fourth seal 59 are shown.
The outer diameter of the half cylinder 52 is, for example, 100 mm.
[0034]
In the cylinder unit 50, as described above, when the air pressure flows from the inlet 51 as shown by the arrow (4), the rod 54 moves forward as shown in FIG. 7, and the rod 54 moves backward by the load Fb acting on the rod 54. . Naturally, the directional control valve 44 (see FIG. 4) is opened during the reverse operation.
[0035]
FIG. 8 is a perspective view of a cushion device according to another embodiment. The same components as those in the embodiment shown in FIGS.
The cushion device 12B arranges the six tubes 32 in parallel, pours the tubes 32 so as to be cast, and cuts out a part of the tubes 32 in the casting base 31 thus obtained. A plurality of cylinder holes 36B are bored, and half cylinders 52, each of which is closed only at one end of the cylinder, are fitted into the cylinder holes 36B, and pistons are fitted into the half cylinders 52. 53 (see FIG. 7) is fitted, and by supplying compressed air to the cylinder hole 36B through the tube 32, the piston 53 (see FIG. 7) is operated, and the holding pad 21 (see FIG. 2). ) Is a multi-cylinder assembly structure that can control the pressing force F1 (see FIG. 2). 39B is a blind plug of the cylinder hole 36B... 64 is a blind plug at the end of the tube 32, and 65 is a base clamping seat.
[0036]
In the cushion device 12B of another embodiment, the same effect as the cushion device 12 of FIG. 4 is exhibited. That is, the versatility with respect to the molds provided with different pressing pads can be improved.
[0037]
In addition, a half cylinder 52 that is closed only at one end of the cylinder of FIG. 8 is fitted into the cylinder hole 36B, and a piston 53 (see FIG. 7) is fitted into the half cylinder 52. The assembly operation is completed simply by attaching the assembled cylinder unit 50. Therefore, the production efficiency can be improved.
In addition, since the half cylinder 52 is fitted into the cylinder hole 36B, it takes less time to form the cylinder wall 52a (see FIG. 7), and the working time can be reduced.
[0038]
In addition, the structure of the upper mold | type 15 and the lower mold | type 17 shown to embodiment of this invention is an example.
The form of the half cylinder 52 and the form of the piston 53 are examples.
The configuration of the pressure control unit 34 is an example, and the pressure control unit 34 may be configured by only a pressure control valve, for example.
[0039]
【The invention's effect】
The present invention exhibits the following effects by the above configuration.
According to the first aspect of the present invention, the cushioning device of the press machine includes a plurality of tubes arranged in parallel, poured so as to enclose these tubes, and a number of tubes are cut out in the casting base obtained thereby. The piston is operated by drilling a single cylinder hole, fitting the piston into each of these cylinder holes, and supplying pressurized air or pressurized oil to the cylinder hole through the tube. It can be opened without using a cutting tool such as a drill, and compressed air or pressurized oil can be supplied to the cylinder hole by a cast tube. As a result, it does not take time to form a flow path for supplying compressed air or pressurized oil to the cylinder hole, and the production cost can be reduced.
[0040]
The cushioning device has a plurality of tubes arranged in parallel, and a plurality of cylinder holes are formed in the casting base in which these tubes are cast, so that a part of the tube is notched, and a piston is fitted into each of these cylinder holes. Since this is a multi-cylinder assembly structure that can control the pressing force of the pressing pad by operating the piston by supplying compressed air or pressurized oil to the cylinder hole through the tube, a pressing pad different from the current upper mold A different pressing pad can be operated using a piston different from the currently used piston with respect to the provided upper mold, and versatility with respect to each mold having a different pressing pad can be improved.
[0041]
In claim 2, since the half cylinder closed only at one end of the cylinder is fitted into the cylinder hole, and the piston is fitted into the half cylinder, the assembly work can be performed only by attaching the cylinder unit in which the half cylinder and the piston are assembled. Complete. Therefore, the production efficiency can be improved.
Further, since the half cylinder is fitted in the cylinder hole, it takes less time to form the cylinder wall, and the working time can be reduced.
[0042]
According to the third aspect of the present invention, since the pressure can be controlled for each tube by providing the pressure control means for each of the plurality of tubes, the pressure for each tube is changed, that is, the pressing force of the pressing pad is reduced. The change does not take time and can reduce the production cost, and can further improve the versatility with respect to the mold having different pressing pads.
[Brief description of the drawings]
FIG. 1 is a first explanatory diagram of press molding using a cushion device according to the present invention. FIG. 2 is a second explanatory diagram of press molding using a cushion device according to the present invention. FIG. 4 is a view taken along the arrow 4 in FIG. 3. FIG. 5 is a cross-sectional view of a casting base according to the present invention. FIG. 6 is a diagram of another embodiment. FIG. 8 is a perspective view of a cushion device according to another embodiment. FIG. 9 is an explanatory view of a conventional press device. FIG. 10 is an explanatory view of a conventional hydraulic die cushion device. 】 Explanatory drawing of conventional cushion device 【Explanation of symbols】
DESCRIPTION OF SYMBOLS 11 ... Press machine, 12 ... Cushion device, 14 ... Holder, 21 ... Holding pad, 31 ... Casting base, 32 ... Tube, 34 ... Pressure control means, 36, 36B ... Cylinder hole, 36a ... Piston, 52 ... Half cylinder, 53 ... Piston, F1 ... Pressing force.

Claims (3)

In a press machine where a cushion device is attached to the holder of the press machine and a pressing pad is attached to the cushion device,
In the cushion device, a plurality of tubes are arranged in parallel and poured so that these tubes are cast, and a plurality of cylinder holes are formed in the cast base obtained by cutting a part of the tubes. A plurality of cylinder sets that can control the pressing force of the pressing pad by operating the piston by fitting pistons into the cylinder holes and supplying compressed air or pressurized oil to the cylinder holes through the tubes. A cushioning device for a press machine, characterized by being a structure. The press machine cushion device according to claim 1, wherein a half cylinder closed only at one end of the cylinder is fitted into the cylinder hole, and the piston is fitted into the half cylinder. The press machine cushion device according to claim 1 or 2, wherein a pressure control means is provided in each of the plurality of tubes so that the pressure can be controlled for each tube.

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