JP2016203200A - Lower die - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lower die having integrally rotatably a burr push-crushing part for push-crushing a burr and an ejector member.SOLUTION: A lower die for removing a burr caused in a cutting edge lower part of a plate-like workpiece, comprises a lower die body 5 supported by a die holder 3 in a punch press, and the inside of this lower die body 5 is provided with a rotary body 13 freely rotatable around the axis in the vertical direction. A pin member 15 having a conical-shaped burr push-crushing part 17 in an upper end part is provided in a central position of this rotary body 13, and the pin member 15 is provided with an ejector member 21 having a vertically freely penetrating through-hole 31 so as to be vertically freely rotatable in the rotary body 13 and integrally freely rotatable with the rotary body 13.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a lower mold for crushing and removing burrs generated on the lower surface of a workpiece when shearing such as cutting and punching of a metal plate as an example of the workpiece is performed. The present invention relates to a lower mold having an ejector plate (ejector member) that supports a workpiece that is movable up and down and rotatable following the movement of the workpiece.

  For example, when a plate-like workpiece is subjected to shearing such as punching or cutting with upper and lower dies provided in a press machine such as a turret punch press, burrs are generated at the lower portion of the processing edge. Therefore, it has been proposed to remove (crush) burrs using separate upper and lower molds provided in the press machine (see, for example, Patent Documents 1 and 2).

Japanese Patent No. 4916104 Japanese Patent No. 4659026

  The configuration described in Patent Document 1 is a configuration in which a lower die having a ball as a tool for removing burrs is attached to a lower turret in a turret punch press. Then, after the lower mold is indexed and positioned at the processing position, the lower mold is raised to a predetermined height and used by the lower mold lifting means provided in the punch press. Accordingly, the configuration described in Patent Document 1 requires a lower mold lifting means.

  The lower part of the tool described in the cited document 2 has a configuration in which a pin-shaped rolling element having a conical pressure surface at the upper end is rotatably provided around a vertical axis. And the said pressurization surface exists in the state which always protruded from the upper surface of the workpiece stand in the tool lower part. Therefore, when the lower part of the tool described in Patent Document 2 is used by being attached to the lower turret described in Patent Document 1, the lower mold lifting means can be omitted.

  However, when the lower part of the tool described in Patent Document 2 is attached to the lower turret described in Patent Document 1, the pressing surface in the lower part of the tool is always in a state of protruding from the path line where the workpiece is moved horizontally. There arises a new problem that the lower surface of the plate-like workpiece to be pressed by the turret punch press tends to be scratched.

  The present invention has been made in view of the above-described problems, and is a lower mold for removing burrs generated at a lower portion of a cutting edge of a plate-shaped workpiece, and is a lower mold supported by a die holder in a punch press. The lower mold body has a main body, and a rotary body that is rotatable about the vertical axis, and a pin member that has a conical burr crushing portion at the upper end at the center position of the rotary body. The ejector member provided with a through-hole through which the pin member can vertically penetrate is provided on the rotary body so as to be movable up and down and integrally with the rotary body.

  Further, in the lower mold, the upper surface of the ejector member is formed in a convex curved surface, and, normally, the burr crushing portion of the pin member is flush with the upper surface of the ejector member or immerses from the upper surface. It is characterized by being.

  Further, in the lower mold, the shape of the burr crushing portion provided at the upper end portion of the pin member is a frustoconical shape, and protrudes from the upper surface center portion of the pin member. It is.

  According to the present invention, the ejector member can be moved up and down with respect to the pin member having the burr crushing portion at the upper end portion and can be rotated integrally with the pin member. Can be prevented from contacting the upper end of the pin member.

It is a section explanatory view showing the composition of the lower metallic mold concerning the embodiment of the present invention. It is an expansion explanatory view of the burr crushing part with which the upper end part of the pin member was equipped.

  Referring to FIG. 1, a lower mold 1 according to an embodiment of the present invention is configured to be detachably supported by a lower turret 3 as an example of a die holder in a turret punch press (not shown), for example. The lower mold 1 includes a cylindrical lower mold body 5 supported in a die mounting hole 3H in the lower turret 3. A bearing block 11 including a thrust bearing portion 7 and a radial bearing portion 9 is provided in the lower mold body 5. A rotating body 13 is supported on the bearing block 11 so as to be horizontally rotatable about a vertical axis. The thrust bearing portion 7 and the radial bearing portion 9 may be provided separately.

  The rotary body 13 is integrally provided with a large-diameter shaft portion 13B rotatably supported by the thrust bearing portion 7 on an upper portion of a vertical shaft portion 13A rotatably supported by the radial bearing portion 9. It is a configuration. A pin member 15 is provided so as to protrude upward in the central portion (center position) of the upper surface of the large diameter shaft portion 13B. The upper end portion of the pin member 15 is provided with a burr crushing portion 17 for removing (crushing) a burr (not shown) generated below the cutting edge of the plate-like workpiece W.

  More specifically, as shown in FIG. 2, the burr crushing portion 17 is provided at the center of the upper surface of the pin member 15 so as to slightly protrude upward. The burr crushing portion 17 is formed in a truncated cone shape, and the conical surface 19 is formed in a concave curved surface. The burr crushing portion 17 is formed to have a small diameter (the diameter at the intermediate height position is 1 mm to 2 mm) so as to enable crushing of the burr near the corner portion of the rectangular hole formed in the workpiece W, for example. The protruding height of the pin member 15 from the upper surface 15F is set to be smaller than the diameter.

  That is, as shown by an imaginary line in FIG. 2, when the burrs are crushed by firmly pressing the lower side of the cutting edge of the workpiece W against the conical surface 19, The diameter of the burr crushing portion 17 is set to be about 1/3 smaller than the diameter of the pin member 15. In other words, the diameter of the burr crushing portion 17 is reduced and the rigidity of the burr crushing portion 17 is reduced so that burr crushing in the vicinity of the corner portion of the square hole is possible while maintaining the rigidity of the pin member 15 large. In order to keep the burr crushing portion 17 large, the protruding height of the burr crushing portion 17 from the upper surface 15F is set smaller than the diameter of the burr crushing portion 17. Note that the upper surface 15F of the pin member 15 is formed in a tapered surface whose outer peripheral side is slightly lowered in order to avoid contact with the workpiece W when the burrs are crushed.

  A cylindrical ejector member 21 that supports the workpiece W is provided on the outer periphery of the large-diameter shaft portion 13B in the rotary body 13 so as to be movable up and down. More specifically, the ejector member 21 is always urged upward by an elastic member 23 such as a plurality of coil springs provided at appropriate intervals in the circumferential direction on the upper surface of the large-diameter shaft portion 13B. In order to restrict the upward movement of the ejector member 21, the ejector member 21 has a distal end portion in a vertical groove 25 provided at an appropriate interval in the circumferential direction on the outer peripheral surface of the large-diameter shaft portion 13B. A plurality of restricting pins 27 are provided that are vertically movable.

  Therefore, the upward movement of the restriction pin 27 is restricted at the upper end portion of the groove 25, so that the upward movement of the ejector member 21 is restricted. Further, the relative rotation of the ejector member 21 with respect to the rotary body 13 is restricted by the engagement of the groove 25 and the restriction pin 27. The upper surface 29 of the ejector member 21 is formed in a convex curved surface such as a spherical shape whose central portion is at the highest position, and a through hole 31 through which the pin member 15 can vertically pass is provided in the central portion. It has been.

  In the above configuration, when the ejector member 21 is always pressed and urged upward by the elastic member 23 and the upward movement of the ejector member 21 is restricted, the upper end portion of the pin member 15 is provided. The upper surface of the burr crushing portion 17 is at the same height as the uppermost upper surface of the ejector member 21 or is slightly recessed from the upper surface of the ejector member 21. Therefore, in a normal state, the workpiece W is supported by the ejector member 21 and is held in a non-contact state with respect to the burr crushing portion 17.

  In the configuration as described above, the lower mold 1 is attached to the lower turret in the turret punch press, and the lower mold 1 is not indexed and positioned at the processing position of the turret punch press. When in a separated state, the burr crushing portion 17 provided in the pin member 15 is at the same height as the upper surface of the ejector member 21 or is in a state of being recessed from the upper surface of the ejector member 21. Therefore, in a normal state, the workpiece W passing over the lower mold 1 is supported by the ejector member 21 in the lower mold 1. Therefore, the lower surface of the workpiece W does not come into contact with the burr crushing portion 17 to cause scratches.

  In order to remove (crush) the burrs generated on the lower side of the shearing edge when the workpiece W is punched or sheared by the turret punch press, the lower mold 1 is moved to the processing position. Index and position. Then, by the work movement positioning means provided in the turret punch press, the shear edge of the work W is shown in FIG. 2 by an imaginary line in the burr crushing portion 17 of the pin member 15 provided in the lower mold 1. It is positioned at a position corresponding to the conical surface 19.

  Thereafter, the upper die (not shown) mounted on the upper turret of the turret punch press is lowered, and the workpiece pressing shearing member 33 such as a ball or a roller provided in the upper die shears the workpiece W. When the upper portion of the edge is pressed, the ejector member 21 is lowered against the urging force of the elastic member 23. When the ejector member 21 is lowered, the burr generated on the lower side of the shearing edge of the workpiece W is strongly pressed against the conical surface 19 of the burr crushing portion 17 and is crushed (removed). Therefore, as described above, the state in which the lower portion of the shear edge of the workpiece W is strongly pressed against the conical surface 19 of the burr crushing portion 17 is maintained, and the lower mold 1 is relatively moved along the lower portion of the shear edge of the workpiece W. By moving to, burrs generated at the lower part of the shearing edge can be crushed.

  As described above, when the lower mold 1 is relatively moved along the lower part of the shearing edge of the workpiece W, the pin member 15 is rotated around the vertical axis. The ejector member 21 also rotates integrally with the pin member 21. As described above, the upper surface 15F of the pin member 15 is a tapered surface that slightly lowers the outer peripheral side when moving relatively while pressing the lower shear edge of the workpiece W firmly to the conical surface 19 of the burr crushing portion 17. Therefore, the upper surface 15F escapes from the lower surface of the workpiece W, and friction due to contact is suppressed.

  Further, even if the burr crushing portion 17 is smaller in diameter than the pin member 15 (for example, the diameter is 1 mm to 2 mm), the protruding dimension is small, so that the rigidity can be kept large. Therefore, for example, even when a burr near the corner of a square hole is crushed, the burr crushing portion 17 is not deformed, and the burr can be easily crushed.

  As can be understood from the above description, according to the lower mold 1 according to the present embodiment, in a normal state, the workpiece W is supported by the ejector member 21 provided on the lower mold 1 so as to be movable up and down. Since the burr crushing portion 17 is not contacted, the bottom surface of the work W is not scratched. Further, for example, even when the diameter of the burr crushing portion 17 is reduced to perform burr crushing near the corner of the square hole, the protrusion height of the burr crushing portion 17 from the upper surface 15F of the pin member 15 is Since the burr crushing portion 17 is smaller in diameter than the burr crushing portion 17, the burr crushing portion 17 can have a large rigidity and can easily crush the burr near the corner of the square hole.

  In the above description, the rotary body 13 and the pin member 15 are provided separately, but can be provided integrally.

DESCRIPTION OF SYMBOLS 1 Lower die 5 Lower mold main body 13 Rotating main body 15 Pin member 15F Upper surface 17 Burr crushing part 19 Conical surface 21 Ejector member 23 Elastic member 29 Upper surface 31 Through-hole

Claims (3)

  A lower die for removing burrs generated at the lower part of the cutting edge of a plate-like workpiece, comprising a lower die body supported by a die holder in a punch press, and a vertical axis around the lower die body An ejector comprising a pin body having a conical burr crushing portion at the upper end at the center position of the rotary body, and having a through-hole through which the pin member can pass vertically A lower mold characterized in that a member is provided on the rotary body so as to be movable up and down and to be rotatable integrally with the rotary body.   2. The lower mold according to claim 1, wherein the upper surface of the ejector member is formed in a convex curved surface, and, in a normal state, the burr crushing portion of the pin member has the same height as the upper surface of the ejector member or A lower mold characterized by being immersed from the upper surface. 3. The lower die according to claim 1 or 2, wherein a shape of the burr crushing portion provided at the upper end portion of the pin member is a frustoconical shape, and protrudes from a central portion on the upper surface of the pin member. Lower mold characterized by.

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