JP2010194581A - Press device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a press device which, while reducing its size, can simultaneously perform a plurality of workings. <P>SOLUTION: The press device 10 comprises a single camshaft 15 which is rotation-driven by a drive motor 16, a plurality of cams 28 fixed coaxially on the camshaft 15, a plurality of cam followers 27 that are driven by the plurality of the cams 28 and change the rotational motion to a reciprocating vertical motion, a plurality of upper mold units 20 that are vertically moved by the plurality of the cam followers 27, and a plurality of lower mold units 30 that are disposed so as to correspond to the plurality of the upper mold units 20. A workpiece 40 is progressively fed into between the plurality of the upper mold units 20 and the plurality of the lower mold units 30 to perform a plurality of workings. The press device 10 is characterized in that timings at which the plurality of the upper mold units 20 reach the bottom dead point are shifted by adopting a plurality of cams 28 different from each other in shape and the plurality of workings are carried out at respective different timings. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a press apparatus, and more particularly, to a press apparatus that performs processing while sequentially feeding a workpiece between an upper mold unit and a lower mold unit.

  As a press apparatus for performing this type of processing, for example, the one described in Patent Document 1 below is known. This press machine has a single camshaft that is rotationally driven by a drive motor, a cam follower that converts the rotational motion of this camshaft into a linear motion, an upper die that is moved up and down by this cam follower, and an upper die that is to be processed. It is configured with a lower mold for processing the material.

JP-A-10-314998

  However, when a plurality of processes are collectively performed with a single press device, the load on the camshaft, the drive motor, and the like increases. Therefore, in order to withstand these collective processing and further support the reaction force, the drive motor, the camshaft and the like must be enlarged, and the press device is enlarged.

  The present invention has been completed based on the above circumstances, and an object of the present invention is to perform a plurality of processes at once while reducing the size of a press device.

  The present invention relates to a single camshaft that is rotationally driven by a drive motor, a plurality of cams that are coaxially fixed with respect to the camshaft, and a plurality of cams that are respectively driven to reciprocate up and down. A plurality of cam followers that convert into motion, a plurality of upper mold units that are moved up and down by the plurality of cam followers, and a plurality of lower mold units that are arranged corresponding to the plurality of upper mold units, A press apparatus that performs a plurality of processes while sequentially feeding a workpiece between an upper mold unit and the plurality of lower mold units, and by changing the shapes of the plurality of cams, the plurality of upper mold units Is characterized in that the timing to reach the bottom dead center is shifted and the plurality of processes are performed at different timings.

  According to such a configuration, since a plurality of processes are performed at different timings, the load applied to the entire press apparatus can be distributed. Therefore, since it is not necessary to increase the size of the camshaft and the drive motor, the press device can be reduced in size, and a plurality of processes can be performed collectively.

  In addition, since a mold composed of a plurality of upper mold units and a plurality of lower mold units is used, only a unit that requires maintenance can be removed during mold maintenance. Moreover, since the weight per unit can be reduced, handling becomes easy and the maintenance property of the mold can be improved.

The following configuration is preferable as an embodiment of the present invention.
The steps performed by the upper die unit while the camshaft rotates 360 ° include a releasing step for releasing the workpiece, a pressing step for pressing the workpiece, and a machining step for performing the plurality of machining steps. The upper die unit may be configured to move up and down later in the processing step than in the release step and the pressing step.

  According to such a configuration, as shown in the press displacement curve C of FIG. 9, the speed before reaching the bottom dead center (near 210 °) in the machining process can be slowed, so the upper mold unit collides with the lower mold unit. The impact at the time decreases, and the mold becomes difficult to deteriorate. Further, since the deformation resistance of the workpiece is reduced, the machining accuracy is improved and the machining quality can be improved. Further, in the release process and the pressing process other than the machining process, the upper mold unit can be moved up and down quickly, so that the entire process can be speeded up.

The plurality of upper mold units may be configured to move up and down at the same timing in the releasing step and the pressing step.
According to such a configuration, even when the processing timings of the upper mold units are different, the workpieces can be simultaneously conveyed in the releasing step, and the workpieces can be pressed simultaneously in the pressing step.

The timing at which the upper unit reaches the bottom dead center may be configured such that the rotation angle of the camshaft is set to 180 ° or more in the processing step.
According to such a configuration, it is possible to gently perform the pressing step before shifting to the processing step, and it is possible to prevent a displacement of the workpiece in the pressing step.

  Further, when the processing speed is slowed by adding a link mechanism to the crank mechanism, the speed near the bottom dead center (180 °) is set to the crank curve as shown in the press displacement curve B (one-dot chain line portion) in FIG. Although it can be slower than A (broken line part), it must be a symmetrical curve in terms of mechanism. Therefore, the speed is lowered to the vicinity of the bottom dead center when the upper mold unit rises beyond the bottom dead center. On the other hand, in the present invention, as shown in the press displacement curve C (two-dot chain line portion) in FIG. 9, the bottom dead center can be set to around 210 °. Can be slower than B. Furthermore, the speed in the vicinity of the bottom dead center when the upper die unit rises beyond the bottom dead center can be made faster than the press displacement curve B. As a result, even when the camshaft is rotated at the same rotational speed, the machining speed of the machining process can be made slower than that obtained by adding a link mechanism to the crank mechanism, and the collision speed of the upper and lower molds can be lowered. Can do.

It is good also as a structure which makes the process stroke of the said upper mold | type unit differ by the kind of said process by varying the shape of these several cams.
According to such a configuration, as the machining stroke becomes shorter, the torque required for machining becomes smaller, so the load on the entire press apparatus can be reduced.

  According to the present invention, it is possible to collectively perform a plurality of processes while reducing the size of the press device.

Front view of the press device in the release process before the start of processing Front view of the press device in the pressing process The front view of the press apparatus which showed the state which the punch corresponding to a 2nd cam reached the bottom dead center in a manufacturing process The front view of the press apparatus which showed the state which the punch corresponding to a 2nd cam began to raise in the manufacturing process, and the punch corresponding to a 1st cam and a 3rd cam reached the bottom dead center Front view of the press device in the release process after processing is complete Schematic diagram showing the workpiece Perspective view showing processed terminals The figure which showed the press displacement curve in this embodiment The figure which showed the press displacement curve in comparison with the past

<Embodiment>
An embodiment of the present invention will be described with reference to the drawings of FIGS. As shown in FIG. 1, the press apparatus 10 according to the present embodiment is configured to install a plurality of mold units 11 side by side and perform a plurality of processes at once by using these mold units 11. The mold unit 11 includes an upper mold unit 20 having an upper mold 21 and a lower mold unit 30 having a lower mold 31.

  As shown in FIG. 6, a plurality of workpieces 40 of the present embodiment are connected by a carrier 41 at intervals by punching a thin metal plate having a thickness of about 0.2 to 0.3 mm. . These workpieces 40 are processed into female terminal fittings 42 shown in FIG. 7 by punching, bending, coining, or the like.

  The upper die 21 has a punch 22 that can be slid in the vertical direction independently for each unit. The lower die 31 has a die 32 disposed on the punch 22 corresponding to the lower side. A post set including a guide post set and a stopper post set is provided between the upper mold 21 and the lower mold 31 in order to increase the processing position accuracy. The workpiece 40 can be transported between the upper mold 21 and the lower mold 31, and the workpiece 40 can be processed by the punch 22 and the die 32.

  The lower mold 31 includes a die plate 33 to which a die 32 is assembled, and a die holder 34 that supports the die plate 33. The die plate 33 is divided into a plurality of parts corresponding to the respective lower mold units 30, whereas the die holder 34 is configured by a single member common to the respective lower mold units 30. The die plate 33 is provided with a pair of release members 37 that release the workpiece 40 from the lower die 31.

  At the lower end portions on both the left and right sides of the die holder 34, flange portions 35 are provided to project to the left and right sides. The lower mold 31 is fixed to the upper surface of the bolster 36 by fixing the flange portion 35 to the bolster 36 with bolts. Further, the bolster 36 is fixed on the lower frame 12 </ b> L constituting the lower portion of the frame 12.

  The upper die 21 includes a punch plate 23 to which a punch 22 is assembled, and a stripper 24 that holds the workpiece 40 from above. The stripper 24 is movable in the vertical direction with respect to the punch plate 23. Both the punch plate 23 and the stripper 24 are supported by a slide 25. A cam follower 27 is disposed above the slide 25. The slide 25 and the cam follower 27 are connected by a plurality of guide rods 26.

  Between the upper frame 12U constituting the upper part of the frame 12 and the lower frame 12L constituting the lower part, an intermediate frame 12C is provided in a horizontal posture. The middle frame 12C is provided with a through hole 12H that allows the plurality of guide rods 26 to pass through in the vertical direction. Further, a spring receiving portion 12R opened upward is recessed at a position surrounded by the plurality of through holes 12H in the middle frame 12C. A compression spring 13 is incorporated between the spring receiving portion 12R and the cam follower 27. Thereby, the cam follower 27 is held in contact with a cam 28 described below.

  A pair of bearings 14 are disposed on the left and right sides of the upper frame 12U. Furthermore, a single camshaft 15 supported by both bearings 14 is disposed inside the upper frame 12U. The cam 28 is fixed to the outer peripheral surface of the camshaft 15. A plurality of cams 28 are provided corresponding to the number of mold units 11. The plurality of cams 28 are fixed coaxially to the camshaft 15. In the following description, the plurality of cams 28 may be referred to as a first cam 28, a second cam 28, and a third cam 28 in order from the left in FIG.

  In the present embodiment, the first cam 28 and the third cam 28 have the same shape and are arranged so as to overlap the axis of the camshaft 15. On the other hand, the second cam 28 has a partially different shape from the first cam 28 and the third cam 28.

  The camshaft 15 is rotationally driven by a drive motor 16 via a drive mechanism 17. When the camshaft 15 is rotated, the cam 28 is rotated, and the cam follower 27 is slidably contacted with the outer peripheral surface of the cam 28, whereby the rotary motion is converted into the reciprocating vertical motion. Thereby, the upper mold unit 20 moves up and down according to the shape of the cam 28.

  In the present embodiment, the vertical height position (press displacement) of the slide 25 with respect to the rotation angle of the camshaft 15 is controlled by the cam shape of the cam 28. FIG. 8 shows a press displacement curve of the upper die unit 20 (punch 22) with respect to the rotation angle of the camshaft 15 depending on the cam shape of each cam 28. 8 indicates the press displacement curve of the second cam 28, and the one-dot chain line portion in FIG. 8 indicates the press displacement curves of the first cam 28 and the third cam 28. In this embodiment, regardless of the cam shape, the press displacement curves in the releasing step of releasing the workpiece 40 and transporting the workpiece 40 and the pressing step of pressing the workpiece 40 are made to coincide with each other. By varying the press displacement curve in the processing step of processing the material 40 for each upper mold unit 20, the load on the camshaft 15 and the drive motor 16 is distributed. In other words, the bottom dead center position of the punch 22 due to the cam shape of the second cam 28 is set near 180 °, whereas the bottom dead center of the punch 22 due to the cam shape of the first cam 28 and the third cam 28 is set. The position is set to be around 210 °.

  In the present embodiment, in addition to being able to perform a plurality of different types of processing (for example, punching and bending) at different timings, a plurality of processing of the same type (for example, punching) Can be performed at different timings. Although not specifically illustrated, the stroke of each punch 22 may be changed by changing the shape of each cam 28 for each processing content, and the load on the entire press apparatus 10 may be reduced. For example, although the stroke required for punching is determined by the thickness of the workpiece 40, in the case of bending or the like, there is no direct relationship with the thickness of the workpiece 40, and at the time of bending It is determined in consideration of the effect of the springback. In this respect, in the present embodiment, since the workpiece 40 is a thin plate material, punching can be performed with a shorter stroke than bending. Therefore, by setting the stroke required for the punching process to be short, the torque can be reduced and the load applied to the entire press apparatus 10 can be reduced.

Next, the processing method of the workpiece 40 by the press apparatus 10 is demonstrated.
In the state of FIG. 1, since the workpiece 40 is released from the stripper 24 of the upper die 21, the workpiece 40 can be transported in the lateral direction all together (release process). The workpiece 40 is stopped at a predetermined processing position, the cam shaft 15 is rotationally driven by the drive motor 16 and the cam 28 is rotated, whereby the cam follower 27 moves downward. As a result, the slide 25 moves downward via the guide rod 26, and the upper die 21 also moves downward.

  As shown in FIG. 2, when the stripper 24 of the upper mold 21 presses the workpiece 40 from above, the downward movement of the stripper 24 is restricted (pressing step). In the steps so far, the plurality of upper mold units 20 operate at the same timing. However, in the subsequent processing steps, the timings at which the plurality of upper mold units 20 reach the bottom dead center are shifted by making the shapes of the plurality of cams 28 different so that the plurality of processing are performed at different timings. ing.

  First, when only the central slide 25 corresponding to the second cam 28 moves downward and the punch plate 23 of the central upper die 21 moves downward, the central punch 22 moves downward as shown in FIG. Then, the workpiece 40 is punched, bent, coined, or the like between the central punch 22 and the central die 32. When the central punch 22 starts to pass through the bottom dead center, the left and right slides 25 corresponding to the first cam 28 and the third cam 28 start to move downward. As a result, the left and right punches 22 move downward, and the workpiece 40 is punched, bent, or coined between the left and right punches 22 and the left and right dies 32 as shown in FIG. It is processed (processing step).

  When the left and right punches 22 pass through the bottom dead center and start to rise, all the upper mold units 20 shift to the pressing process all at once and start to operate at the same timing. The strippers 24 of all the upper mold units 20 move upward from the upper surface of the lower mold 31, shift to a release process, and release the workpieces 40 all at once, whereby the conveyance of the workpieces 40 is started.

  As described above, in the present embodiment, since the plurality of processes are performed at different timings by making the shapes of the cams 28 different, the load on these can be dispersed. Therefore, since it is not necessary to enlarge the camshaft 15 and the drive motor 16, the press apparatus 10 can be reduced in size and a some process can be performed collectively.

  Further, since the mold unit 11 composed of a plurality of upper mold units 20 and a plurality of lower mold units 30 is used, only the unit requiring maintenance is removed when the mold unit 11 is maintained. be able to. Moreover, since the weight per unit becomes small, handling becomes easy and the maintainability of the mold unit 11 can be improved.

  Further, as shown in FIG. 8, since the speed before the punch 22 reaches the bottom dead center (near 210 ° in FIG. 8) in the machining process can be reduced, the impact when the upper die 21 collides with the lower die 31. And the mold unit 11 is less likely to deteriorate. Moreover, since the deformation resistance of the workpiece 40 is reduced, the machining accuracy is improved and the machining quality can be improved. Further, in the release process and the pressing process other than the machining process, the punch 22 can be moved up and down quickly, so that the entire process can be speeded up.

  Further, as shown in FIG. 8, the press displacement curves of the pressing process and the releasing process are set to match regardless of the cam shape of each cam 28, so that even when the processing timing of each punch 22 is different, it is released. The workpiece 40 can be simultaneously conveyed in the process, and the workpiece 40 can be pressed simultaneously in the pressing process. Furthermore, since the bottom dead center of the punch 22 by the first cam 28 and the third cam 28 is set to around 210 °, which is larger than 180 °, the pressing step before shifting to the machining step can be performed gently. The positional deviation of the workpiece 40 in the pressing step can be prevented. Therefore, the processing speed of the punch 22 near the bottom dead center can be made slower than before, and the speed near the bottom dead center when the punch 22 rises beyond the bottom dead center can be made faster than before. Thereby, even when the camshaft 15 is rotated at the same rotation speed, the machining speed of the machining process can be made slower than the conventional one, and the collision speed of the upper and lower molds 21 and 31 can be made slower.

  Moreover, the stroke of each punch 22 can also be set to a different stroke by making the shape of each cam 28 different. As a result, the stroke required for the punching process can be shortened and the torque required for the machining can be reduced, so that the load on the entire press apparatus 10 can be reduced.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) Although the cam shapes of the first cam 28 and the third cam 28 are set to be the same in this embodiment, according to the present invention, the cam shapes of the first cam 28, the second cam 28, and the third cam 28 May be set differently.

  (2) In this embodiment, although the speed of the punch 22 in the machining process is slower than the releasing process and the pressing process, according to the present invention, the speed of the punch 22 in the machining process is made the same as the releasing process and the pressing process. Also good.

  (3) In the present embodiment, the press displacement curves of the punches 22 are matched in the releasing process, but according to the present invention, the press displacement curves of the punches 22 may be matched at least in the pressing process.

  (4) In the present embodiment, the timing at which the punch 22 reaches the bottom dead center is set at a time when the rotation angle is 180 ° or more. However, according to the present invention, the timing at which the punch 22 reaches the bottom dead center is 180 °. It may be set at a time less than.

  (5) Although the strokes of the punches 22 are matched in the present embodiment, according to the present invention, the strokes of the punches 22 may be changed according to the processing content.

DESCRIPTION OF SYMBOLS 10 ... Press apparatus 15 ... Cam shaft 16 ... Drive motor 20 ... Upper mold unit 27 ... Cam follower 28 ... Cam 30 ... Lower mold unit 31 ... Lower mold 40 ... Workpiece

Claims (5)

A single camshaft that is rotationally driven by a drive motor;
A plurality of cams fixed coaxially to the camshaft;
A plurality of cam followers that are respectively driven by the plurality of cams and convert the rotational motion into reciprocating motion;
A plurality of upper mold units moved up and down by the plurality of cam followers;
A plurality of lower mold units arranged corresponding to the plurality of upper mold units,
A press apparatus that performs a plurality of processes while sequentially feeding a workpiece between the plurality of upper mold units and the plurality of lower mold units,
The press apparatus characterized in that the plurality of cams have different shapes to shift the timing at which the plurality of upper mold units reach the bottom dead center, and the plurality of processes are performed at different timings. The steps performed by the upper die unit while the camshaft rotates 360 ° include a releasing step for releasing the workpiece, a pressing step for pressing the workpiece, and a machining step for performing the plurality of machining steps. Including
The press apparatus according to claim 1, wherein the upper die unit moves up and down later in the processing step than in the release step and the pressing step.   The press device according to claim 2, wherein the plurality of upper mold units move up and down at the same timing in the releasing step and the pressing step.   4. The press device according to claim 2, wherein the timing at which the upper unit reaches the bottom dead center is set at a time when the rotation angle of the camshaft is 180 ° or more in the processing step. 5. . The press device according to any one of claims 1 to 4,
The press apparatus characterized in that the processing stroke of the upper die unit is made different depending on the type of processing by making the shapes of the plurality of cams different.

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