JPH048159B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a mechanical press device, and more particularly to an improvement in a press device for processing members such as sashes for vehicles or construction, moldings for automobiles, and the like.

BACKGROUND TECHNOLOGY For example, when press forming moldings and 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 extrusion molded into a profiled material with a fixed cross section. After cutting the 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 1), which is a composite extrusion molding of soft vinyl chloride resin and a metal plate such as a stainless steel plate, the belt is cut to a certain length after the composite extrusion molding. (See Figure a) If the cross-sectional shape is complex, deformation is likely to occur, whereas if the cross-sectional shape is relatively simple, such as a U-shape, it may be possible to leave the running cut as is. , many require recutting 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 side B of the edge for subsequent bending and fix it with a clip etc. A square hole C is formed (Fig. c
), and finally the terminal portion D is bent into a predetermined shape (see Figure d).

Conventionally, floating dies have been used as press dies for this type of processing, and four presses, for example, are installed along a conveyor that runs in a straight line, and one person is assigned to each press. Mass production is possible by assigning workers.

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 steps, and multiple molds are fixed as one unit to one press machine. It is necessary to insert the molding terminal into each mold and perform processing.

To deal with this, the stroke from the dead center of the ram to the bottom dead center is always constant and cannot be changed with the same press device, but the height from the bolster surface of the press device to the bottom dead center of the ram, That is, since the shaft height is adjustable, it is conceivable to adjust the shaft height. However, it is often necessary to adjust the processing stroke used to actually press the mold during the trial stage after the press mold is completed, especially when there are multiple molds that include a drawing die or a bending die. For example, when we test the actual bending die, it is often 1 to 5 mm.
Often requires some degree of adjustment. 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 standard, the shaft height of other adjacent molds will become inappropriate, and subtle differences in bending will occur depending on the lot of material used, so it is desirable to be able to adjust it for each lot. . However, the relationship between the press stroke and shaft height (see Fig. 2) is determined by fixing four molds A to D on one bolster of the press machine, and determining the most desirable bottom dead center for each mold. The optimal position is a′~
If d', the shaft height from above the bolster surface will be different, and it is completely impossible to obtain such a shaft height with a normal press device. Note that in FIG. 1, points a to d are the positions of each open height.

DISCLOSURE OF THE INVENTION An object of the present invention is to provide a press device that can easily obtain different shaft heights using a single upper frame that moves up and down, and can be manufactured at a lower cost than a normal crank press device.

That is, in the press apparatus according to the present invention, there is provided a bolster on which a plurality of press molds are placed side by side on a plate surface, an upper frame that moves up and down with a constant stroke with respect to the bolster, and a lower surface of the upper frame. A plurality of press plates are installed on the side and press the press mold on the bolster as the upper frame moves downward, and each of the press plates is interposed between each press plate and the upper frame. The press is attached to the upper frame via a spacer plate, and is pressed via a length-adjustable support shaft that positions the spacer plate in contact with the lower surface of the upper frame when pressing the press mold with each press plate. The plate and the spacer plate are attached to the upper frame such that they can be freely separated from the lower surface of the upper frame, and the press plate and the spacer plate are screwed together with screws that can be screwed in or unscrewed formed on each opposing surface, and the support shaft By screwing in or unscrewing a spacer plate spaced apart from the lower surface of the upper frame, the amount of protrusion of each pressing plate can be freely adjusted from the lower surface of the upper frame and combined with each other.

In this press device, the press plate and the spacer plate are screwed together by screws formed on opposing surfaces that can be screwed in and unscrewed, and are combined with each other so that the amount of protrusion of the press plate can be adjusted from the bottom surface of the upper frame. The shaft height of each pressure plate can be adjusted individually by screwing the pressure plate into or out of the spacer. In addition, each press plate and spacer plate are attached to the upper frame via a length-adjustable support shaft that allows the spacer plate to come into contact with the lower surface of the upper frame when pressing the press mold with each press plate. Because the press plate is attached to the press die on the bolster, the spacer plate and the upper frame receive the load that occurs when each press plate presses the press die on the bolster, allowing stable shaft height to be maintained without putting stress on the support shaft, etc. You will be able to get it.

Embodiment The following will be described with reference to FIGS. 3 to 5.

In this press device (see Fig. 3), a substantially rectangular plate-shaped bolster 1 on which press dies A, B, C, and D are placed and fixed is fixed to a frame 2. Grooves 11a, 11b, and 11c are formed in which roller devices (not shown) that allow molds A to D to be slid when placed are accommodated therein. On the other hand, inverted T-shaped grooves 12a and 12b are continuously formed in the longitudinal direction to house and lock a part of a clamp (not shown) for fixing the press molds A to D on the bolster 1. ing. Furthermore, cylindrical guide posts 3a and 3b are fixed approximately in the center on both ends of the bolster 1 in the longitudinal direction with bolts, etc., and inside the guide posts 3a and 3b are round bar-shaped guides that can freely slide up and down. Bars 4a and 4b are inserted therethrough. The lower ends of the guide bars 4a, 4b pass through holes 13 provided in the bolster 1, and one end of a connecting rod 51 is connected to the flat tip 41 via a pin. The other end of the connecting rod 51 is fitted into the side surface of the flywheel 52, and a gear is formed on the outer periphery of the flywheel 52. Although not shown, the same flywheel as the right side is arranged on the left side of the drawing, and the left and right flywheels are connected by a shaft. A gear 53 meshing with the gear of the flywheel 52 is connected to a pulley 55 via an electromagnetic clutch 54.
is connected to. V belt 5 on pulley 55
An electric motor 57 is connected via the guide bar 6, and the guide bars 4a, 4b are moved up and down by the drive of the electric motor 57. Also, guide bar 4
An upper frame 6 is fastened to the upper end side 42 of a, 4b at an end 61 with a nut 62. Therefore,
The height of the upper frame 6 relative to the bolster 1 can be adjusted within the shape range of the screw 43 by rotating the nut 62. In addition, the upper frame 6 can be configured with a wide intermediate part 63 and narrow widths at both ends 61, integrally made of metal casting or welded steel plates, so as to increase bending rigidity in the vertical direction, and the intermediate part 63 has a space inside. Three reinforcing plates 6 that are approximately gutter-shaped and have both side parts 64 and a bottom part 65, and connect the both side parts 64, 64.
6, 66, 66. In addition,
The upper frame 6 is supported by pneumatic cylinders 44, 44 to prevent the guide bars 4a, 4b from becoming eccentric when they slide up and down, and to move up and down in a well-balanced manner. Air is supplied to only one port of these cylinders 44, 44 so that the rods of the cylinders are always extended.

A mechanism is attached to the upper frame 6 to allow adjustment of the shaft height of each of the molds A to D individually. The adjustment mechanism 7 (see Fig. 4) is
It consists of a disk-shaped pressing plate 71 and a ring-shaped spacer plate 72. The press plate 71 has a cylindrical convex portion 71a at the center of the main body, and the spacer plate 72 is ring-shaped and threaded on the circumferential surface, and has a relative screw 73 with a screw cut on the outer periphery of the convex portion of the press plate 71.
are screwed together. In addition, the pressure plate 7
A screw shaft 74 is installed so as to protrude upward from the center of the plate surface. This screw shaft 74 projects above the upper frame 6 through an opening 67 formed in the bottom plate 65 of the upper frame 6, and its screw shaft portion is supported by a screw handle 75 installed on the upper frame 6. It is installed by.
The screw handle 75 includes a screw tube 75a that protrudes downward from the boss portion, and a screw formed within the diameter of the tube 75 is screwed into the screw shaft portion of the screw shaft 74 so that it can be screwed in or unscrewed by operating the handle. ing. The boss portion of the handle 75 is rotatably fixed to a support plate 76 placed on the upper frame 6, and the screw tube 75a and the screw shaft portion of the shaft 74 are screwed in or out by rotation of the handle. It is configured so that the user shaft 74 can be moved to protrude or retreat from the upper frame 6.

In a press device equipped with such an adjustment mechanism,
The shaft height of each of the molds A to D on the bolster 1 can be individually adjusted by operating a handle of a plurality of adjustment mechanisms arranged in parallel corresponding to the number of molds. In making the adjustment, first, the handle 75 is rotated counterclockwise to project the screw shaft 74 downward from the upper frame 6. In this state, a gap is created between the spacer plate 72 and the lower surface of the upper frame 6, and the spacer plate 72 can be screwed into or unscrewed from the pressure plate 71 using the relative screws 73. If you want to increase the shaft height with a screw, screw the spacer plate 72 in the direction in which it contacts the pressing plate 71 with a relative screw 73. Thereafter, the handle is operated again to move the screw shaft 74 in the upward direction until the spacer plate 72 comes into pressure contact with the lower surface of the upper frame 6. In this state, the amount of movement of the press plate 71 from the lower surface of the upper frame is relatively small, so the press plate 71
1 allows you to increase the shaft height. On the contrary, in order to shorten the shaft height, the spacer plate 72 is attached to the relative screw 7 by the operation described above.
3, just unscrew it in the direction away from the pressing plate 71. When the unscrewed spacer plate 72 is pressed against the lower surface of the upper frame, the amount of movement of the press plate 71 increases, so that the shaft height can also be shortened.

Note that each adjustment mechanism 7 has a screw shaft 75.
By forming the opening 67 of the upper frame 6 as a horizontally elongated hole, each mold A placed on the bolster 1 can be inserted.
The mounting position can be adjusted with respect to ~D. In addition, if the strength of both side parts 64 of the upper frame 6 is increased, the upper frame 6 can be composed of both side parts 64 and a reinforcing part 66. In this case, since a bottom plate is unnecessary, it is natural that the horizontally elongated holes 67
is also no longer necessary.

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. Therefore, the time required for replacing and adjusting the press mold can be extremely shortened. In addition, when the lower surface of the press plate presses the press mold, the pressure is transmitted to the upper frame via the press plate and the spacer plate, so the durability in use can be improved since no pressure is applied to the support means of the press plate. In addition, since it can be constructed with a simple mechanism, the production cost can be reduced by about half compared to a crank press that is normally on the market and has a bolster of approximately the same size.

[Brief explanation of drawings]

Figures 1 a to d are explanatory diagrams showing the processing conditions of a workpiece to be pressed, Figure 2 is a graph showing the relationship between cylinder stroke and shaft height for each mold assembled in the same press machine, and Figure Figures 3a and 3b are front and side views of the press apparatus according to the present invention, Figure 4 is a side sectional view of the shaft height adjustment mechanism incorporated in the apparatus, and Figures 5a and 5b are explanatory diagrams of the operation of the mechanism. It is. 1: Bolster, 6: Upper frame, 71: Pressing plate, 72: Spacer plate, 73: Relative screw, 74:
support shaft.

Claims (1)

[Scope of Claims] 1. A bolster on which a plurality of press molds are placed side by side on a plate surface, an upper frame that moves up and down with a constant stroke with respect to the bolster, and an upper frame equipped on the lower side of the upper frame. a plurality of press plates that press the press mold on the bolster with the downward movement of the upper frame; a spacer plate is interposed between each of the press plates and the upper frame; When pressing the press mold with the plate, the spacer plate is placed in contact with the bottom surface of the top frame.The press plate and spacer plate are moved apart from the bottom surface of the top frame through a length-adjustable support shaft. The press plate and the spacer plate are screwed together with screws that can be screwed in or unscrewed formed on each opposing surface, and the spacer plate separated from the lower surface of the upper frame is screwed in or screwed together by the support shaft. A press device characterized in that the amount of protrusion of each pressing plate can be freely adjusted from the lower surface of the upper frame by combining them with each other by a return operation.