JPH0338039B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a mechanical press device, and particularly relates to an improvement of a press device for processing members such as sashes for vehicles or construction, moldings for automobiles, etc. be.

Conventional technology For example, when press forming moldings or sashes for automobiles, usually a metal strip material of a certain width is formed into a profiled material with a given cross section, or a resin is extruded into a profiled material with a given cross section. After cutting a formed long material into a desired length, the long material is subjected to processes such as partial cutting, drilling, notching, bending, and drawing. Specifically, in the processing process of Weatherstrip Belt Molding M (see Figure 5), which is made by composite extrusion molding of soft vinyl chloride resin and a metal plate such as a stainless steel plate, it runs to a certain length after composite extrusion molding. It is a cutting tool (see figure a), and if the cross-sectional shape is complex, deformation is likely to occur; if the cross-sectional shape is relatively simple, such as a U-shape, it can be left as running cutting. However, most require re-cutting to trim the edge f. After cutting the edge including a part of the outer surface part A (see figure b), cut out a part of the lower part B of the edge for the subsequent bending process, and fix it with a clip etc. A square hole C is formed (see c in the figure), and the end portion D is finally bent into a predetermined shape. (See figure d) Conventionally, floating dies are used as press dies for this type of processing, and for example, four presses are installed along one conveyor that runs linearly, and each press Mass production is possible by assigning one worker to each machine.

By the way, in the automobile industry, as social and user needs are diversifying, we are trying to reduce wasteful inventory as much as possible, and moreover, provide users with "what they need, when they need it, in the amount they need, right away."
There is a shift to the so-called kanban method or just-in-time method, which allows production and delivery. When processing moldings for automobiles using this method, for example, one worker must be in charge of four processes, and one press machine has one
It is necessary to fix a plurality of molds as one unit and insert the end of the molding into each mold to perform processing.

To deal with this, the stroke from the top dead center of the ram to the bottom dead center is always constant and cannot be changed in the same press device, but the height from the bolster surface of the press device to the bottom dead center position of the ram is That is, since the shaft height is adjustable, it is conceivable to adjust the shaft height.

Problems to be Solved by the Invention However, it is often necessary to adjust the processing stroke for actually pressing the die during the trial stage after the press die is completed. For example, in the case of products that include a bending die, for example, when the bending die is tested in actual processing, it often requires adjustment of about 1 to 5 mm. To adjust this, for example, if the stroke amount is too large, the bottom plate of the mold can be ground down, and vice versa, if it is insufficient, an additional bottom plate can be fixed to the bottom of the mold. If you adjust the shaft height of the entire press as a reference, the shaft heights of other adjacent molds will become inappropriate.
Also, since slight differences in bending occur depending on the lot of material used, it is desirable to be able to make adjustments for each lot. However, the relationship between the press stroke and shaft height (see Figure 6) is
Fix four molds A to D on one bolster,
If the most desirable optimal position of the bottom dead center for each mold is a' to d', the shaft height from above the bolster surface will be different, and the optimal shaft height for each mold can be determined using a normal press machine. is completely impossible to obtain. In addition, the 6th
In the figure, points a to d are the positions of each open height. In addition, even if these shaft heights and strokes are set theoretically, it is necessary to conduct a trial in advance to confirm whether or not they are set accurately. If the work is carried out under normal pressure after inserting the material, for example, if the forming die is a drawing die that protrudes greatly toward the ram side, the press die processing will occur before the die reaches the bottom dead center of the stroke. When the end point is reached, there is a risk that the tool will collide with the workpiece and cause a so-called "biting" phenomenon, causing the entire device to stop. Not only is extremely troublesome work required to release this biting, but in the worst case, it may lead to troubles such as damage to the mold or deformation of the press device.

Means for Solving the Problems In the press device according to the present invention, a guide bar is vertically and slidably supported by a guide bush fixed to the bolster surface, and the upper end of the axis of the guide bar is fixed at a constant level with respect to the bolster surface. An upper frame that moves up and down with a stroke is installed, and a plurality of press plates are placed on the bottom side of the upper frame, and spacer plates are interposed between the press plates and the upper frame. They are installed in parallel so that they can be selectively fixed or released from the upper frame through plates, and each press plate and spacer plate are screwed together with a screw, and when the press plate is released from the upper frame, the screw The pressing plate is assembled so that the amount of protrusion from the lower surface of the upper frame that the spacer plate comes into contact with can be adjusted by relative screwing in and unscrewing rotation, and the rotary drive shaft is eccentrically connected to the lower end of the shaft of the guide bar via a connecting rod. A drive motor is connected to the rotary drive shaft, a friction disk type fluid clutch is interposed in the drive power supply system of the drive motor, and a flow path supplies normal fluid pressure to the fluid clutch. and a flow path for supplying reduced fluid pressure are selectively and switchably connected.

Function With this press device, the shaft height of each press plate can be adjusted individually by screwing in or unscrewing the space plate, and the spacer plate screwed onto the press plate is held in contact with the lower surface of the upper frame. This makes it possible to obtain a stable shaft height without applying any mechanical load.
Furthermore, since each pressing plate can be moved downward with a reduced driving pressure during a trial shot, it is possible to prevent the phenomenon of digging in even when the adjustment of each shaft height is not set accurately.

Embodiments The following description will be made with reference to FIGS. 1 to 4.

In this press apparatus (see FIGS. 1a and 1b), a substantially rectangular plate-shaped bolster 1 on which press molds A, B, C, and D are mounted and fixed is fixed to a frame 2. The plate surface of the bolster 1 has a press mold A~
Grooves 11a, 11b, 11 that accommodate roller devices (not shown) that allow sliding when placing D
c is formed toward the back of the drawing, and in the horizontal direction are inverted T-shaped grooves 12a and 12b that accommodate and lock a part of the slump (not shown) that fixes the press molds A to D on the bolster 1. are formed continuously.
Cylindrical guide bushes 3a and 3b are fixed approximately in the center on both lateral ends of the bolster 1 with bolts, etc., and inside the guide bushes 3a and 3b are round guide bars 4a and 4b that are vertically slidable. 4
b is inserted and arranged.

An upper frame 5 is fastened to the upper shaft end side 41 of the guide bars 4a, 4b at an end portion 51 with a nut 52. The height of the upper frame 5 relative to the bolster 1 can be adjusted within the shaping range of the screw 42 by rotating a nut 52. In addition, the upper frame 5 is made of a metal casting or a welded steel plate structure with a wide middle part 53 and narrow end parts 51 to increase bending rigidity in the vertical direction.
The intermediate portion 53 is approximately gutter-shaped with a space inside and has both side portions 54 and a bottom portion 55.
It is formed with three reinforcing plates 56 that connect the two. Note that this upper frame 5 has guide bars 4a and 4b.
It is supported by pneumatic cylinders 43, 43 so as to prevent eccentricity when sliding up and down and to move up and down in a well-balanced manner. Air is supplied to only one port of the cylinders 43, 43 so that the rods of the cylinders are always extended.

A mechanism is attached to the upper frame 5 to allow adjustment of the shaft height of each of the molds A to D individually. The adjustment mechanism 6 (see FIGS. 2a and 2b) includes a disk-shaped pressing plate 61 and a ring-shaped spacer plate 62. Pressing plate 6
1 has a cylindrical convex portion 61a at the center of the main body, and the spacer plate 62 is ring-shaped and threaded on the circumferential surface and screwed together with a relative screw 63 to a screw cut on the outer periphery of the convex portion of the press plate 61. has been done. Further, on the upper frame 5 side, a support plate 64 wider than the width of the side wall 54 is provided.
A pneumatic or hydraulic cylinder 65 is provided which is tightened and fixed with bolts or the like. The tip of the rod of the cylinder 65 passes through a long hole 57 provided in the bottom 55 of the upper frame 5 as a support for the press plate 61, and is screwed into the press plate 61 to be securely fixed thereto. An air cylinder is preferably used as the drive cylinder 65, and its operating circuit is based on the weight of the rod and piston of the cylinder 65 and the weight of the pressure plate 61 and spacer plate 62 attached to the tip of the rod when the press device is not used. When the rod is extended and the press device is used, it is preferable to incorporate a device that operates the solenoid 65a to retract the rod. In its operating circuit, a lubricating oil supply 6
6b and a pressure regulator 65c.
Further, since the drive cylinder 65 is placed on the upper frame 5 by the support plate 64, its position can be adjusted in accordance with the molds A to D placed on the bolster 1.
In addition, since this drive cylinder 65 causes slight lateral deviation from the respective corresponding positions of the molds A to D during continuous operation of the press device, a bar 58 having hook-shaped teeth is fixed to the top or side surface of the upper frame 5. At the same time, it is preferable that a plate 66 having hook-like teeth is attached to the support plate 64 of the drive cylinder 65 so that the plates 66 mesh with each other to prevent misalignment. Also,
The shaft height can also be adjusted by supporting the pressing plate 61 with a spring or a screw shaft instead of the driving cylinder 65 as a support for the pressing plate 61, but if the driving cylinder 65 is used as described above, the shaft height can be adjusted very easily. Allows for easy shaft height adjustment.

Guide bar 4 with this upper frame 5 on the upper end side of the shaft
a, 4b pass through the hole 13 provided in the bolster 1, and a pin 4 is attached to the tip 44 formed in a flat plate shape.
One end of the connecting rod 71 is connected via the connecting rod 5 (see FIGS. 1a and 1b). The other end of this connecting rod 71 is connected to a rotating shaft 73 of a flywheel 72.
Further, a small gear 74 is disposed in mesh with the toothed outer peripheral edge of the flywheel 72. The gear 74
A rotary drive shaft 75 is supported at the center, and a drive motor 78 connected to the drive shaft by a V-belt 77 via a clutch, preferably an air clutch 76, operated by fluid pressure is attached to the other end of the drive shaft. There is. The air clutch 78 incorporated in this drive system is a friction disk type with a built-in diaphragm.
The clutch valve 75a of No. 6 has a flow path 80 that supplies air pressure of about 5.5 kg/cm ² required for normal operation, and a pressure reducing valve that supplies a relatively reduced air pressure of about 2.5 kg/cm ² . 81 and a flow path 82 which is supplied via a solenoid 83 (see FIG. 3).

In the press apparatus configured in this way, when adjusting the distance H from the lower surface of the upper frame 5 to the lower surface of the press plate 61 (see FIG. 2b) before the trial stage, the operation of the press apparatus is first stopped and then the press apparatus is driven. When the solenoid 65a of the cylinder 65 is turned off,
The fluid inside the cylinder is discharged to the outside of the cylinder, and the rod of the cylinder 65 can be extended by its own weight or by pulling it lightly downward by hand. During the expansion, a gap is generated between the upper surface of the spacer plate 62 and the lower surface 55 of the upper frame 5 (see FIG. 4a).
In this state, slide the entire mechanism laterally by hand along the horizontally long hole 57 formed in the bottom plate of the upper frame 5 so that it is positioned directly above the press die placed on the bolster 1, and then remove the press plate 61. By rotating the spacer plate 62 clockwise while holding it lightly with your hand (see Fig. 4b), the spacer plate 62 moves downward and the shaft height can be increased by the gap H-α (see Fig. 4b). (see figure c). After completing the predetermined adjustment, when the solenoid 65a is activated to move the rod of the cylinder 65 backward, the spacer plate 6
The upper surface of the upper frame 5 is pressed against the lower surface 55 of the upper frame 5.
It is firmly fixed against. On the contrary, when shortening the shaft height, the spacer plate 62 may be rotated counterclockwise to increase the gap α between the spacer plate 62 and the presser plate 61.

When performing a trial after the adjustment, the air supply path to the air clutch 76 is changed to the pressure reduction flow path 82 by switching the solenoid 83, and the air pressure is reduced from the air pressure required for normal press drive to the guide bars 4a and 4b. to move the upper frame 5 up and down. If there are variations in the shaft height in this trial, the molds A~
Since the contact with D is different and the impression of the pressing blade of the mold on the workpiece placed on each mold is different, the amount of protrusion of the pressing plate 61 can be individually adjusted to the required shaft height based on this. . When each of these shaft heights has been set accurately, the solenoid 83 is switched, and the air pressure necessary for normal press drive is supplied from the flow path 80 to the air clutch 76, and the drive motor 78 performs the press operation. be able to.

Effects of the Invention As described above, according to the press device according to the present invention, the shaft height can be individually adjusted for each press die simply by adjusting the gap between the press plate and the spacer plate. The time required to replace and adjust the press mold is extremely short, and the trial can be performed with reduced pressure driving force, so even if there are variations in shaft height at that stage, the press plate will bite into the mold. Such a situation does not occur, and adjustment can be made to obtain an accurate shaft height with a simple operation. In addition, since the press plate that presses the mold is always held in contact with the lower surface of the upper frame via the spacer plate, a stable shaft height can be maintained without applying any mechanical load to the supports that support the press plate. You will be able to get it.

[Brief explanation of the drawing]

Figures 1a and b are a front view and a side view of a press device according to the present invention, Figures 2a and b are a partially cutaway front view and a plan view of a shaft height adjustment mechanism incorporated in the same device, and Figure 3 is a Air supply circuit diagram for the air clutch installed in the same device, Figures 4 a to c
5 is an explanatory diagram of the operation of the shaft height adjustment mechanism, FIGS. 5 a to d are explanatory diagrams showing the processing state of the workpiece to be pressed, and FIG. It is a graph showing the relationship with shaft height. 1: Bolster, 3a, 3b: Guide bushing, 4a, 4b: Guide bar, 5: Upper frame, 61:
Pressing plate, 62: Spacer plate, 63: Relative screw, 65: Pressing plate support, 71: Connecting rod, 75: Rotation drive shaft, 76: Fluid clutch, 7
8: Drive motor, 80: Normal air pressure supply channel, 82: Decompression air supply channel, 83: Switching solenoid.

Claims (1)

[Claims] 1. A guide bar is supported so that it can slide up and down with a guide bush fixed to the bolster surface, and an upper frame that moves up and down with a constant stroke with respect to the bolster surface is attached to the upper end of the shaft of this guide bar, and the lower surface of the upper frame is attached. With a spacer plate interposed between the press plate and the upper frame, a plurality of pressure plates can be selectively fixed to or released from the upper frame via the spacer plate using a support provided on the upper frame. Equipped in parallel, each press plate and spacer plate are screwed together with screws, and when the press plate is released from the upper frame, the spacer plate comes into contact with the lower surface of the upper frame by relative screwing and unscrewing rotation of the screws. A rotational drive shaft is eccentrically connected to the lower end of the shaft of the guide bar via a connecting rod, and a drive motor is connected to the rotational drive shaft. A friction disc-type fluid clutch is interposed in the drive power supply system of the drive motor, and the fluid clutch is selectively switched between a flow path that supplies normal fluid pressure and a flow path that supplies reduced fluid pressure. A press device characterized in that it can be connected.