JP2004105977A - Press cam device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a press cam device that enables drilling and bending to be performed on a workpiece by changing a pressurizing force in the direction closing a die mounted on a press to a pressurizing force in the direction crossing the closing direction. <P>SOLUTION: The press cam device 26 is equipped with a bracket 27 installed in a lower die 15, a cam driver installed in the bracket movably in the press direction and rotatably in the direction that the cam face 68 of the cam driver 28 attaches to and detaches from the cam face 74 of a cam slider 32, a rotating means 31 for rotating this cam driver, and a control part 33 for operating the rotating means and inverting the cam driver at the time of releasing a workpiece. When the cam driver is inverted, the workpiece can be released in the shortest distance passing near the cam slider without interfering with the cam driver. Since the opening/closing stroke of an upper die is reduced by a distance corresponding to the height of the cam driver, the cycle time is shortened, enabling the production efficiency to be improved. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a press cam device that performs hole forming and bending work on a workpiece by changing a pressing force in a closing direction of a mold attached to a press machine into a pressing force in a direction intersecting the closing direction.
[0002]
[Prior art]
In a conventional press cam device, a device in which a cam driver and a cam slider are integrated is arranged in a lower mold (for example, see Patent Document 1).
There is also a device in which a device in which a cam driver and a cam slider are integrated is arranged in an upper mold (for example, see Patent Document 2).
[0003]
[Patent Document 1]
JP-A-58-209427 (page 2, FIG. 6)
[Patent Document 2]
JP-A-7-290168 (page 3-4, FIG. 1)
[0004]
The above Patent Documents 1 and 2 will be described in detail with reference to the drawings.
FIG. 9 is an explanatory view of a conventional press device (a copy of FIG. 5 of Patent Document 1 is (a), and a copy of FIG. 6 is (b)).
The press device slidably inserts the driving cam 21 into the bolster 3 and presses the driving cam 21, the driven cam 23 (in the direction of arrow G), and the intermediate cam 24 (in the direction of arrow H) in descending order of the ram 2. Since the workpiece 28 is pressed and clamped, the driving cam 21 can be separated from the ram 2 and the height (distance 1) of the opening 29 can be increased, which facilitates the work and improves workability. It is to do.
[0005]
FIG. 10 is an explanatory view of a conventional press cam mold (a copy of FIG. 1 of Patent Document 2 is (a), and a copy of FIG. 5 is (b)).
The conventional press cam mold 1 includes a support means 5 (base 22) attached to an upper mold 4, a cam slider 3 movably attached to the support means 5, a cam driver 8 sliding on the cam slider 3, and Suspending means 9 (first connecting member 54) for suspending the cam driver 8 so that the cam driver 8 can move up and down. When the upper die 4 descends, the cam driver 8 comes into contact with the positioning table 88 and moves upward (arrow C). ), The cam slider 3 is moved (in the direction of arrow A), and a hole can be made in the workpiece 91 on the lower die 81 by the drilling tool 37. That is, since the cam 1 for the press hangs the cam driver 8, the upper surface of the lower mold 81 can have a large space, and the workpiece 91 can be placed or taken out without moving up and down. .
[0006]
[Problems to be solved by the invention]
In the press apparatus shown in FIG. 9, the height (distance 1) of the opening 29 is increased by inserting the driving cam 21 into the bolster 3. When the object 28 is taken in and out, the workpiece 28 may interfere with the driving cam 21. However, since the height of the opening 29 has been increased, if the workpiece 28 is taken out from the center of the opening 29, interference can be prevented. However, it takes time to take the workpiece 28 in and out, and the opening 29 is large, so that the ram 2 takes time to move. Therefore, the production efficiency decreases.
[0007]
Since the press cam die of FIG. 10 has a structure in which the cam driver 8 is suspended from the upper die 4, the upper surface of the lower die 81 is naturally widened. However, only by suspending the cam driver 8, the distance the upper die 4 moves up and down, that is, the opening and closing stroke of the upper die 4 is almost the same as when the cam driver 8 is not suspended. If the stroke amount of the upper die 4 is reduced, the time of the molding cycle can be reduced, but there is a possibility that the workpiece 91 may interfere with the suspended cam driver 8.
[0008]
Therefore, an object of the present invention is to provide a press cam device that prevents interference with a cam driver and improves production efficiency.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, a first aspect of the present invention is to attach a cam slider and a cam driver to one of an upper mold and a lower mold for a press, and move the cam driver in the press direction with the other mold to press the cam slider. In a press cam device that can be moved in a direction that intersects the direction, a bracket is attached to one of the molds, and the bracket can be moved in the press direction and the cam surface of the cam driver comes into contact with and separates from the cam surface of the cam slider. A cam driver is rotatably mounted, a rotating means for rotating the cam driver is provided, and a control unit for operating the rotating means to invert the cam driver when dispensing a workpiece is provided.
[0010]
When the other mold is an upper mold, the cam driver moves up and down in contact with the upper mold as the upper mold descends and rises. Work is performed on the work when the upper mold is lowered, and the work is paid out when the upper mold is raised. At the time of this payout, when the cam driver is turned over and the press cam device is folded in half, the height of the press cam device is reduced to almost half, and a space can be secured. As a result, the workpiece can be paid out from between the upper die and the cam slider without interfering with the cam driver, and the stroke of opening and closing the upper die can be reduced by a distance corresponding to the height of the cam driver. The molding cycle time can be shortened.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of reference numerals.
FIG. 1 is an explanatory diagram of press molding using the press cam device according to the present invention.
The upper mold 13 for pressing as the other mold is attached to the ram 12 of the press machine 11, the lower mold 15 as one mold is attached to the bed 14 of the press machine 11, the work 16 is set on the lower mold 15, and the upper mold 13 is lowered by the stroke amount S to make holes.
[0012]
The upper die 13 has a pressing portion 21, and the lower die 15 is pressed by a flat surface 22 of the pressing portion 21. Here, the pressing portion 21 is not provided with a member for holding the work 16 or a mold for molding, but it is also possible to attach the holding member or the mold detachably.
The lower mold 15 has a base portion 24 attached to the bed 14, a mold portion 25 provided on the base portion 24, and a press cam device 26.
[0013]
The press cam device 26 includes a bracket 27 attached to the base 24, a cam driver 28 attached to the bracket 27, a rotating unit 31, a cam slider 32 attached to the base 24, and a control unit 33 for controlling the rotating unit 31. , A linear guideway 34, and springs 35, 35 (see FIG. 2). Reference numeral 36 denotes a processing tool attached to the cam slider 32.
[0014]
The press cam device 26 also moves the cam driver 28 down as shown by the arrow b by the upper die 13 descending in the press direction (direction of the arrow a) together with the ram 12 of the press machine 11, and simultaneously with the cam driver 28 descending, the cam slider 32 moves forward as indicated by the arrow c, and a hole is formed at a predetermined position of the work 16 with the processing tool 36.
[0015]
FIG. 2 is a view taken in the direction of the arrow 2 in FIG. 1. The bracket 27 is attached to the base 24, the cam driver 28 is attached to the bracket 27, the rotating means 31, and the bracket 27 is attached to the base 24 via the linear guideway 34. The cam slider 32 and springs 35, 35 for applying a backward (in the direction of arrow d in FIG. 1) force to the cam slider 32 are shown.
[0016]
The rotating means 31 rotatably receives the ends of the support shafts 37 and 38, the rollers 41 and 41 rotatably supported by the support shafts 37 and 38, and the ends of the support shafts 37 and 38. It comprises bearing blocks 42, 43 and a drive source 44 attached to the bearing block 42, and rotates the cam driver 28 in the direction of arrow e (see FIG. 1).
[0017]
FIG. 3 is a cross-sectional view of the rotating means according to the present invention. The supporting shafts 37 and 38 are integrally attached to the cam driver 28, the rollers 41 and 41 rotatably supported by the supporting shafts 37 and 38, and the supporting shaft. The bearing blocks 42, 43 rotatably receiving the ends of 37, 38 and a drive source 44 attached to the bearing block 42 are shown.
[0018]
The drive source 44 is an electric motor, has a mounting flange 45 and an output shaft 46, and rotates the cam driver 28 by a predetermined rotation angle. A device configuration such as a sensor used for controlling the rotation angle is arbitrary. The drive source 44 may be a pneumatic motor or a hydraulic motor (oscillating motor) other than the electric motor, and the rotation angle of the hydraulic motor is controlled by a sensor or a rotating angle of the oscillating motor not shown.
[0019]
The support shaft 37 forms a fitting hole 47 at one end for fitting the output shaft 46, forms a first shaft portion 48 rotatably fitted to the bearing block 42, and forms a screw 51 at the center. At the end, a second shaft portion 52 and a hexagonal head 53 for rotatably supporting the roller 41 are formed. Although not shown in the drawings, a bearing may be employed if necessary.
The support shaft 38 is the same as the support shaft 37 except that the fitting hole 47 is omitted, and the description is omitted.
[0020]
FIG. 4 is an exploded view of the press cam device according to the present invention, showing a bracket 27, a cam driver 28, a rotating unit 31, and a cam slider 32.
The bracket 27 includes main bodies 56 and 57 provided on both sides. A guide portion 61 for guiding the bearing block 42 is formed on the main body 56. A guide portion 62 for guiding the bearing block 43 is formed on the main body 57.
[0021]
The cam driver 28 has a cam plate 65 attached to the first side plate 64, a second side plate 66 attached to the cam plate 65, and a relief 67 covering the cam slider 32 between the first and second side plates 64, 66. It is. 68 denotes a cam surface, and 69 denotes a pressure receiving portion.
In the cam slider 32, a tool mounting portion 72 and a spring mounting portion 73 were formed at a front portion of a main body 71, a cam surface 74 was formed at a rear portion, and a hollow portion 75 was opened at the center. By forming the cutout portion 75, the weight of the cam slider 32 can be reduced.
[0022]
FIG. 5 is a sectional view taken along the line 5-5 in FIG. 2, in which the rollers 41, 41 (see FIG. 4) and the cam driver 28 move vertically along the guides 61 (see FIG. 4), 62 of the bracket 27. At the same time, the cam slider 32 is guided by the linear guideway 34 and moves in a direction intersecting with the pressing direction (the direction of arrow c), and a molding start state is shown.
The linear guideway 34 includes a rail 76 and carriages 77,77. Reference numeral 78 denotes a stopper.
[0023]
Next, the operation of the above-described press cam device will be described.
When the upper die 13 descends (in the direction of arrow a) from the molding start state shown in FIG. 5, the pressing portion 21 of the upper die 13 reaches the pressure receiving portion 69 of the cam driver 28 and starts pushing the cam driver 28.
[0024]
FIG. 6 is a first operation view of the press cam device according to the present invention.
When the cam driver 28 is pushed by the upper die 13, the cam driver 28 moves (down) in the pressing direction (the direction of arrow a) as indicated by the arrow (1), and the cam surface 68 of the cam driver 28 and the rollers 41, 41 Pushes the cam surface 74 of the cam slider 32 as indicated by arrows {circle around (2)} and {circle around (3)}, so that the cam slider 32 moves in the direction intersecting the pressing direction against the springs 35, 35 as indicated by arrow {circle around (4)} (forward). ).
[0025]
FIGS. 7A and 7B are second operation diagrams of the press cam device according to the present invention.
In (a), when the upper die 13 is further lowered, the respective operations shown in FIG. 6 further proceed, and the processing tool 36 starts to open a hole in the work 16 by shearing as shown by an arrow (5). Then, at the same time when the ram of the press 11 reaches the predetermined bottom dead center, the upper die 13 also reaches the predetermined stroke amount S, and the drilling is completed. Continuing, Ram begins to climb.
[0026]
In (b), when the ram is raised and the upper die 13 is opened, the cam slider 32 starts to return by the springs 35, 35, and the cam surface 74 of the cam slider 32 becomes the cam surface 68 of the cam driver 28 and the rollers 41, 41. , The cam driver 28 and the rollers 41, 41 continue to rise as shown by the arrow (6) while being guided by the guide portions 61, 62 of the bracket 27. When the cam slider 32 stops at the stopper 78, the ascending of the cam driver 28 is completed. On the other hand, the upper mold 13 waits at a predetermined opening limit.
[0027]
Subsequently, the cam driver 28 is rotated by the drive source 44 as shown by an arrow {circle around (7)}. The information of the control unit 33 (see FIG. 1) at that time is based on, for example, a signal of a sensor attached near the stopper 78.
[0028]
FIGS. 8A and 8B are third operation diagrams of the press cam device according to the present invention.
In (a), the drive source 44 rotates the cam driver 28 from the working position 81 to the standby position 82 by 180 ° as shown by the arrow (7). In other words, the cam driver 28 rotates in the direction in which the cam surface 68 of the cam driver 28 comes into contact with or separates from the cam surface 74 of the cam slider 32 (in the direction of arrow {circle around (7)}) by the drive source 44.
[0029]
In (b), after reversing the cam driver 28, the work 16 is taken out as shown by the arrow (8). When returning the cam driver 28, the user operates an operation panel (not shown) to rotate the cam driver 28 through the control unit 33 (see FIG. 1), and the drive source 44 reverses the rotation by 180 °.
[0030]
As described above, in the press cam device 26, when the cam driver 28 is rotated by 180 °, the work 16 is conveyed near the cam slider 32 without interfering with the cam driver 28 indicated by a two-dot chain line and the work 16 is moved by the arrow ▲ in the shortest distance. It can be paid out as in 8 ▼. As a result, the stroke amount S of the upper die 13 can be reduced, the moving time of the upper die 13 is reduced, and the production efficiency can be improved.
[0031]
Further, since the press cam device 26 has a structure in which the cam driver 28 and the cam slider 32 are provided on the lower die 15, the upper die 13 can be formed only by the pressing portion 21. As a result, the pressing portion 21 can correspond to a lower die different from the lower die 15 (provided with a press cam device different from the press cam device 26). The lower die (including another press cam device) can be supported, and the versatility of the upper die 13 can be increased. Therefore, it is possible to reduce the purchase cost of the press mold.
[0032]
As shown in FIG. 4, the cam driver 28 attaches a cam plate 65 to the first side plate 64, attaches a second side plate 66 to the cam plate 65, and releases the cam slider 32 between the first and second side plates 64, 66. Since the portion 67 is provided, the first and second side plates 64 and 66 can enter between the bracket 27 and the cam slider 32 (see FIG. 2) and cover the cam slider 32. As a result, the cam driver 28 shown in FIG. 8 can be folded to reduce the size of the press cam device 26 to about the size of the cam slider 32, so that the press cam device 26 can be saved in space and downsized. it can.
[0033]
Since the cam driver 28 has a configuration in which the cam plate 65 is attached to the first side plate 64 and the second side plate 66 is attached to the cam plate 65, the volume can be reduced and the weight can be reduced.
[0034]
In addition, although the press cam device 26 shown in the embodiment of the present invention is provided on the lower die 15, it may be provided on the upper die.
The configuration of the rotating means 31 is arbitrary.
The configuration of the bracket 27 is an example.
[0035]
Although the cam driver 28 is rotated (reversed) by 180 °, the angle at which the cam driver 28 is rotated is arbitrary, and for example, 135 ° is also possible.
The press cam device 26 is a device that can be used for bending.
The moving direction of the cam slider 32 may not be a right angle in the pressing direction.
[0036]
【The invention's effect】
The present invention has the following effects by the above configuration.
According to the first aspect of the present invention, the press cam device includes a bracket mounted on one of the molds, the cam bracket being movable in the pressing direction and rotatable in a direction in which the cam surface of the cam driver comes into contact with and separates from the cam surface of the cam slider. Equipped with a rotating means for rotating this cam driver, and a control unit for operating the rotating means and reversing the cam driver when dispensing the workpiece, so if the cam driver is reversed, it will not interfere with the cam driver The workpiece can be paid out at the shortest distance by being transported near the cam slider. As a result, the stroke of opening and closing the upper mold can be reduced by a distance corresponding to the height of the cam driver, and the cycle time of molding can be shortened. Therefore, it is possible to improve the production efficiency.
[Brief description of the drawings]
FIG. 1 is an explanatory view of press forming using a press cam device according to the present invention. FIG. 2 is a view taken in the direction of arrow 2 in FIG. 1. FIG. 3 is a sectional view of a rotating means according to the present invention. FIG. 5 is an exploded view of the press cam device. FIG. 5 is a sectional view taken along line 5-5 in FIG. 2. FIG. 6 is a first operation diagram of the press cam device according to the present invention. 8: Third action diagram of the press cam device according to the present invention [Fig. 9] Explanatory diagram of a conventional press device [Fig. 10] Explanatory diagram of a conventional press cam mold [Explanation of reference numerals]
13 ... the other mold (upper mold), 15 ... one mold (lower mold), 16 ... work, 26 ... press cam device, 27 ... bracket, 28 ... cam driver, 31 ... rotating means, 32 ... cam slider, 33 ... Control unit, 68: cam surface of cam driver, 74: cam surface of cam slider.

Claims (1)

A cam slider and a cam driver are attached to one of the upper die and the lower die for pressing, and the cam slider is moved in the pressing direction by the other die, whereby the cam slider can be moved in a direction intersecting the pressing direction. In a press cam device,
A bracket is attached to the one mold, and the cam driver is attached to the bracket so as to be movable in a pressing direction and rotatable in a direction in which a cam surface of the cam driver comes into contact with and separates from a cam surface of the cam slider. A press cam device comprising: a rotating unit for rotating; and a control unit for operating the rotating unit to reverse a cam driver when dispensing a workpiece.

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