JP2007268592A - Rotary cam type press device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary cam type press device corresponding to a complicated shape of a work. <P>SOLUTION: This rotary cam type press device 10 is provided with a rotary cam 12, a cam base 11 which is provided with an arcuate cam groove for supporting the sliding rotation of the rotary cam 12 and an overhanging member 13 which is provided on the cam base 11 and overhung to the inside of a virtual circle α extending the circular arc of the cam groove 22 above the rotary cam 12 and in the upper surface of which a work w is received. In the press working position making the rotary cam 12 rotate along the cam groove 22, the overhanging member 13 and the rotary cam 12 are provided with a junction q inside the virtual circle α extending the circular arc of the cam groove 22 and provided with abutting surfaces 12a, 13a on the outside of the tangent γ of a virtual circle β which are centered at the axis o of rotation of the rotary cam 12 and passed through the junction q and the overhanging member 13 is arranged on the outside of a rotational locus on which the rotary cam 12 moves from a press working position to a stand position. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rotary cam type pressing device.

  The rotary cam type press device is used when forming a negative angle such as bending and punching at the end of a plate-like workpiece. For example, as shown in FIG. 1, the rotary cam type press device 100 includes a cam base 101, a rotary cam 102, a slide plate 103, a processing cam 104, an upper mold holder 105, a pad 106, and a lower mold 107. .

  The cam base 101 is fixed to the lower mold 107, and a cam groove 111 is formed on the upper surface. The rotary cam 102 is rotatably mounted in a cam groove 111 formed in the cam base 101. In addition, as shown in FIG. 1, the cam base 101 may be a combination of two or more members formed in the circumferential direction. The lower surface of the workpiece w is supported together with the rotary cam 102. The upper surface of the workpiece w is pressed downward by a pad 106 held by the upper mold holder 105 so as to be movable up and down, and the workpiece w is positioned. The rotary cam 102 is formed with a machining surface 112 that receives the machining cam 104 in press working, and a slide plate 103 is attached so that the machining cam 104 is introduced toward the machining surface 112.

  The processing cam 104 is slidably held by the upper mold holder 105, and at the time of processing, as shown in FIG. 1, the processing cam 104 is lowered together with the upper mold holder and presses the slide plate 103 downward to rotate the rotary cam 102. , Guided to the rotary cam 102 side. At this time, the processing blade 113 of the processing cam 104 abuts against the processing surface 112 formed on the rotary cam 102 with the work w interposed therebetween, whereby the end of the work w is bent and bent. In addition, an actuator is attached to the rotary cam 102. When the machining cam 104 is detached from the rotary cam 102 and the slide plate 103 at the end of machining, the rotary cam 102 rotates counterclockwise, and the workpiece w Return to the standby position where there is no interference when removing from the mold. Thereby, the workpiece w can be removed without interfering with the rotary cam 102.

The basic structure of such a rotary cam type press device 100 is described in, for example, Japanese Patent Application Laid-Open No. 2003-311347. Japanese Patent Laid-Open No. 2003-31347 discloses that a plurality of rotary cams are used in combination in order to cope with a complicated workpiece shape. Similarly, Japanese Patent Application Laid-Open No. 2001-87828 describes the use of a stepped rotary cam or a rotary cam whose diameter is reduced in the axial direction in order to cope with a complicated workpiece shape.
JP 2001-87828 A JP2003-31347A

  In a conventional rotary cam type pressing device, the installation position of a workpiece at the time of pressing is determined, and the shape of the cam base upper surface and the negative angle forming portion of the rotary cam is determined. That is, as shown in FIG. 1, when the installation position of the workpiece w is determined with respect to the rotary cam 102, the point p where the workpiece shape to be press-molded and the arc of the cam groove in which the rotary cam 102 is installed intersects is the cam base 101 and the rotary cam 102. The shapes of the cam base 101 and the rotary cam 102 are generally determined by tracing the press-molded shape of the workpiece w on the cam base 101 side and the rotary cam 102 side using the branch point p as a base point.

  However, as shown in FIG. 2, in the case of a workpiece shape in which the negative angle portion 201 is curved so as to enter inside in the axial direction of the rotary cam 102, the workpiece w enters inside the rotation region of the rotary cam 102. It may pass. For this reason, in the conventional rotary cam type press device, the branch point cannot be partially set as described above, and the rotary cam 102 is not formed because the rotation of the rotary cam 102 is inhibited by the cam base 101. There is.

  Further, according to the stepped rotary cam described in Japanese Patent Laid-Open No. 2001-87828 and the rotary cam whose diameter is reduced in the axial direction, it may be possible to cope with such a workpiece shape. However, in the stepped rotary cam, it is considered that the stepped portion does not follow the workpiece, and wrinkles are likely to be formed, so that problems are likely to occur. Further, both the stepped rotary cam and the rotary cam reduced in the axial direction have a problem in that the shape of the rotary cam and the cam groove corresponding to the rotary cam are complicated, making it difficult to manufacture and increasing the equipment cost. For this reason, the rotary cam may be divided at an appropriate position and handled by using a plurality of rotary cams. However, this may not be possible, and the design of the workpiece may be unavoidably changed.

  A rotary cam type pressing device according to the present invention includes a rotary cam, a cam base having an arc-shaped cam groove that supports sliding rotation of the rotary cam, a virtual base that is installed on the cam base and extends the arc of the cam groove above the rotary cam. And a projecting member that projects to the inside of the circle and receives a workpiece on the upper surface. The urging member and the rotary cam are provided with a branch point inside a virtual circle obtained by extending the arc of the cam groove in a predetermined pressing posture of the rotary cam obtained by rotating the rotary cam along the cam groove. A contact surface is provided outside the tangent line of the virtual circle passing through the branch point with the center. Further, the urging member is disposed outside the rotation locus where the rotary cam shifts from the press working posture to the predetermined standby posture.

  In this case, the contact surface may be formed as a surface in which the contour lines appearing in the cross section at an arbitrary position in the axial direction of the rotary shaft of the rotary cam are straight lines parallel to each other.

  According to this rotary cam type press device, the rotary cam type press device can be used even for a workpiece having a complicated negative angle portion in which the negative angle portion formed in the work is curved so as to enter the inside of the rotary cam in the axial direction of the rotary cam. Can be adopted. In this case, for example, a rotary cam having a single shaft diameter can be used, and the shape of the cam groove formed in the rotary cam and the cam base can be made simpler, and the equipment cost can be reduced.

  Further, the contact surface can be formed by a surface in which the contour lines appearing in the cross section orthogonal to the rotary shaft of the rotary cam become straight lines parallel to each other at an arbitrary position in the axial direction of the rotary shaft of the rotary cam. In this case, the cutting of the contact surface is facilitated, and the manufacture is facilitated.

  Hereinafter, a rotary cam type pressing device according to an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 3, the rotary cam type press device 10 includes a cam base 11, a rotary cam 12, and an ejection member 13. In addition, the same code | symbol is attached | subjected to the member and site | part which show | plays the same effect | action as the rotary cam type press apparatus shown in FIG.

  As shown in FIG. 2, the workpiece w to be press-curved is curved so that the negative angle portion 201 gradually enters the inner side with respect to the axial direction of the rotary shaft o of the rotary cam 12. This rotary cam type press device 10 corresponds to press molding of the negative angle portion of such a workpiece.

  As shown in FIG. 4, the rotary cam 12 is formed by cutting out a single rotary shaft material having a single shaft diameter. The rotary cam 12 forms a negative angle portion 201 of the work w. The negative angle formation portion 21 forms a negative angle along the axial direction of the rotation axis o of the rotary cam 12 according to the shape of the negative angle portion 201 of the work w. The portion 21 has a shape curved inward so as to approach the rotation axis o. For this reason, the negative angle formation part 21 has the place which has left | separated to the outer side from the rotating shaft o in the axial direction, and the place which has approached inside.

  As shown in FIG. 1, the cam base 11 is formed with an arcuate cam groove 22 that supports the sliding rotation of the rotary cam 12. In this embodiment, since the cam groove 22 employs the rotary cam 12 cut from a single rotary shaft material having a single shaft diameter, the cross-sectional arc shape formed with a single curvature radius is adopted. It is formed with a groove. A mounting surface 11 a for attaching the urging member 13 is formed on the upper portion of the cam base 11. The pressing member 13 may be attached to the attachment surface 11a of the cam base 11 by, for example, bolt fastening.

  The rotary cam 12 is housed in the cam groove 22 of the cam base 11, and an actuator (a cylinder device 31 in the illustrated example) is attached. The rotary cam 12 is rotated so as to be in a predetermined standby posture along the cam groove 22 by the cylinder device 31 before and after processing. Further, at the time of press working, the upper mold lowers and slides and rotates along the cam groove 22 due to the engagement with the working cam 104, thereby taking a predetermined pressing posture.

  The urging member 13 is a member that is installed on the cam base 11, urges above the rotary cam 12 to the inside of a virtual circle α that extends the arc of the cam groove 22, and receives the workpiece w on the upper surface. As shown in FIG. 2, the workpiece w to be press-curved is curved so that the negative angle portion 201 gradually enters the inner side with respect to the axial direction of the rotary shaft o of the rotary cam 12. For this reason, the protruding member 13 has a different shape with respect to the axial direction of the rotary shaft o of the rotary cam 12. FIG. 5 is a partial transverse end view of the rotary cam type pressing device 10 at a position corresponding to the large diameter end face A of FIG. 4 showing the rotary cam 12, and FIG. 6 is a position corresponding to the small diameter end face B of FIG. 2 is a partial cross-sectional end view of the rotary cam type press device 10. FIG.

  As shown in FIGS. 1, 5, and 6, the rotary cam 12 and the pushing member 13 are arranged so that the circular arc of the cam groove 22 is obtained when the rotary cam 12 is rotated along the cam groove 22. Is provided with a branch point q on the inner side of the virtual circle α extending from the center, and the contact surfaces 12a and 13a are provided outside the tangent line γ of the virtual circle β passing through the branch point q with the rotational axis o of the rotary cam 12 as the center. . In FIG. 5 and FIG. 6, δ indicates a straight line obtained by extending the outline of the contact surface appearing in the cross section orthogonal to the axial direction of the rotation axis o of the rotary cam 12.

  The abutting surfaces 12a and 13a cause the rotary cam 12 and the pressing member 13 to abut each other and exert a drag force during pressing, and the rotary cam 12 maintains the pressing posture against the abutment of the processing cam 104. 13 supports the lower surface of the workpiece w with an appropriate drag. As shown in FIG. 3, the rotary cam 12 takes a pressing posture as shown in FIG. 3. After the processing, the rotary cam 12 slides and rotates along the cam groove 22 as shown in FIG. Then, a predetermined standby posture that does not interfere with the workpiece w is obtained. In addition, in the process of installing the workpiece w before processing, it is retracted to such a predetermined standby posture. By forming the contact surfaces 12a and 13a in accordance with the above-described conditions, the rotary cam 12 and the pressing member 13 are moved when the rotary cam 12 is rotated from the press working posture to the predetermined standby posture with respect to the contact surfaces 12a and 13a. Will not cause interference.

  Further, the urging member 13 is disposed on the outer side of the rotation trajectory in which the rotary cam 12 shifts from the press working posture to a predetermined standby posture. In other words, the urging member 13 has a shape that does not extend inward from the rotation trajectory in which the rotary cam 12 shifts from the press working posture to the predetermined standby posture. Thereby, when the rotary cam 12 is rotated from the press working posture to a predetermined standby posture, the rotary cam 12 and the pressing member 13 do not interfere with each other.

  In this embodiment, the contact surfaces 12a and 13a of the rotary cam 12 and the pressing member 13 have contour lines appearing in a cross section at an arbitrary position in the axial direction of the rotary shaft o of the rotary cam 12 in a straight line parallel to each other. Is formed on the surface.

  That is, as shown in FIGS. 5 and 6, the contact surfaces 12 a and 13 a of the rotary cam 12 and the pushing member 13 have contour lines appearing in a cross section at an arbitrary position in the axial direction of the rotary shaft o of the rotary cam 12. Parallel straight lines, in other words, all become straight lines in a direction perpendicular to the common reference plane ε. In this case, by installing an XY table for moving the cutting tool along the common reference plane ε, and defining the cutting direction by the cutting tool in a direction (Z direction) orthogonal to the common reference plane ε The contact surface 12a of the rotary cam 12 can be formed. For this reason, compared with the case where the contact surface is formed of a free-form surface, the cutting of the rotary cam 12 is simplified, and similarly, the cutting of the contact surface 13a of the ejection member 13 is also simplified.

  As described above, according to the rotary cam type pressing device 10, the negative angle portion 201 formed on the workpiece w is complicated in such a way that the negative angle portion 201 is curved so as to enter the inside of the rotary cam 12 in the axial direction of the rotary cam 12. A rotary cam type pressing device can also be adopted for the workpiece w having a portion. In this case, the rotary cam 12 can have a single shaft diameter as in the above-described embodiment, and the cam groove 22 formed in the rotary cam 12 and the cam base 11 can be formed in a simpler shape. Equipment costs can be reduced.

  As mentioned above, although the rotary cam type press apparatus which concerns on one Embodiment of this invention was demonstrated, the rotary cam type press apparatus which concerns on this invention is not limited to said embodiment.

  The shape of the workpiece that can be press-molded by the rotary cam type press device according to the present invention is not limited to the above embodiment, and the shapes of the rotary cam and the ejection member are appropriately changed according to the press-molded shape of the workpiece. Moreover, about the rotary cam, the thing of the single shaft diameter was illustrated. As described above, the present invention extends the application range of a rotary cam even if it has a single shaft diameter. Furthermore, in the present invention, if a rotary cam with a step, a rotary cam having a diameter gradually reduced in the axial direction, or the like is adopted as the rotary cam, the rotary cam type press device can be made to correspond to a more complicated press-molded shape. As described above, according to the rotary cam type press device according to the present invention, it is possible to realize a complicated design that could not be achieved by the conventional rotary cam type press device, and it is possible to greatly expand the application applications of the rotary cam type press device.

The cross-sectional view which shows a rotary cam type press apparatus. The perspective view which shows the workpiece | work press-molded with the rotary cam type press apparatus which concerns on one Embodiment of this invention. The cross-sectional view which shows the rotary cam type press apparatus which concerns on one Embodiment of this invention. The perspective view which shows the rotary cam of the rotary cam type press apparatus which concerns on one Embodiment of this invention. The partial cross-sectional end view of the rotary cam type press apparatus which concerns on one Embodiment of this invention. The partial cross-sectional end view of the rotary cam type press apparatus which concerns on one Embodiment of this invention. The cross-sectional view which shows the standby posture of the rotary cam of the rotary cam type press apparatus which concerns on one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Rotary cam type press apparatus 11 Cam base 12 Rotary cam 12a Contact surface 13a Contact surface 13 Extrusion member 21 Negative angle formation part 22 Cam groove 31 Cylinder apparatus 103 Slide plate 104 Processing cam 105 Upper mold holder 106 Pad 107 Lower mold 113 Processing blade 201 Negative angle part A Large end face B Small end face o Rotating axis q Branch point w Work α Virtual circle β extending cam groove β Virtual circle γ passing through branch point q Tangent δ at branch point q δ Outline of contact surface Extended straight line ε Common reference plane

Claims (2)

Rotary cam,
A cam base having an arcuate cam groove for supporting the sliding rotation of the rotary cam;
A protruding member installed on the cam base, protruding above the rotary cam, into a virtual circle extending the arc of the cam groove, and receiving a workpiece on the upper surface;
The rotary cam and the pushing member are provided with a branch point inside a virtual circle obtained by extending the arc of the cam groove in a predetermined press working posture of the rotary cam obtained by rotating the rotary cam along the cam groove. The abutment surface is provided outside the tangent line of the virtual circle passing through the branch point with the center as the center, and the protruding member is arranged outside the rotation locus where the rotary cam shifts from the press working posture to the predetermined standby posture. A rotary cam type press device.   2. The rotary cam press according to claim 1, wherein the contact surface is formed by surfaces in which contour lines appearing in a transverse section at an arbitrary position in the axial direction of the rotary shaft of the rotary cam are straight lines parallel to each other. apparatus.

Images