JP2008068298A - Press die and retainer collar - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prolong the life of a punch body by making the position of the punch body to a punch guide changeable. <P>SOLUTION: A press die has: a ring-like punch head 3 which is engaged by screwing to a vertical screw shaft 7 formed at the top end of the punch body 2; a punch spring 4 for upward energizing the punch head 3; a ring-like retainer collar 5 for supporting the punch spring 4 in the state where the punch body 2 is penetrated vertically movably; and a cylindrical punch guide 6 which is detachably mounted to the retainer collar 5 and supports the punch body 2 vertically slidably. The upward movement of the punch body 2 is regulated by locking the neck part 13 which is formed on the punch body 2 with the retainer collar 5 and whose diameter is expanded downward. The retainer collar 5 is made so as to be incorporable by turning up side down and the position of the punch body 2 in the state where upward movement is regulated with the retainer collar 5 which is incorporated by turning upside down is made so as to be moved lower than the position of the punch body 2 in the state where upward movement is regulated with the retainer collar 5 which is incorporated without returning upside down. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a press die used for press working and a retainer collar incorporated in the press die.

  As a press die used for press processing, a ring-shaped punch head that is screw-engaged with a vertical screw shaft formed at the upper end of the punch body, a punch spring that biases the punch head upward, and a punch body A press die having a ring-shaped retainer collar that supports a punch spring in a state of penetrating in a vertically movable manner and a cylindrical punch guide that supports a punch body so as to be slidable up and down is often used.

  In this press mold, with the punch guide supported by the holder of the press machine, the punch head is struck by the striker of the press machine, and the punch body is moved downward while compressing the punch spring by the struck pressure. The lower end of the body is brought into pressure contact with the workpiece. Thereafter, when the striker is raised, the punch body is raised by the restoring force of the punch spring, and the lower end of the punch body is separated from the workpiece. At this time, the retainer collar locks the neck portion formed in the punch body and expanding downward, thereby restricting the upward movement of the punch body and positioning the punch body.

  In this press die, the punch guide is detachably attached to the retainer collar. If the cutting edge of the punch body is worn by repeated pressing, the punch guide is removed to expose the lower end of the punch body. Polish the lower end of the punch body to regenerate the cutting edge. At this time, since the distance (punch height) from the upper end of the punch head to the lower end of the punch body becomes small according to the polishing amount of the lower end of the punch body, the punch height is not polished before the punch head is rotated with respect to the punch body. Return to the size.

  However, when the punch height is returned to the size before polishing, the position of the punch head with respect to the punch body becomes higher according to the amount of rotation of the punch head. For this reason, if the polishing of the lower end of the punch body is repeated, the punch head position becomes too high to secure a gap between the striker and the punch head, and the punch body is still punched even if there is still a margin for polishing the lower end of the punch body. There was a problem that the body had to be replaced.

  The problem to be solved by the present invention is to extend the life of the punch body by changing the position of the punch body relative to the punch guide.

  In order to solve the above-mentioned problem, the retainer collar can be assembled by being inverted up and down, and the position of the punch body in a state in which upward movement is restricted by the retainer collar installed by being inverted up and down, The retainer collar incorporated without being turned upside down is shifted downward from the position of the punch body in a state where the upward movement is restricted. The retainer collar includes, for example, a flange portion that supports the punch spring, a short tube portion that extends downward from the inner periphery of the flange portion, and a long tube portion that extends upward from the inner periphery of the flange portion, In the state where the retainer collar is assembled without being turned upside down, the short tube portion locks the neck of the punch body, and in the state where the retainer collar is turned upside down, the long tube portion is attached to the punch body. The neck can be locked.

  In the press die of the present invention, the position of the punch body in a state where the upward movement is restricted by the retainer collar can be shifted downward by inverting the retainer collar up and down. Therefore, when the gap between the punch head and the striker becomes smaller due to the rotation of the punch head, the retainer collar is turned upside down and reassembled to shift the position of the punch head while maintaining the punch height. Thus, it is possible to secure a gap between the striker and the punch head and further polish the lower end of the punch body.

  FIG. 1 shows a press die according to an embodiment of the present invention. This press die includes a punch body 2 having a cutting edge 1 at the lower end, a ring-shaped punch head 3 attached to the upper end of the punch body 2, and a coil-shaped punch spring 4 that urges the punch head 3 upward. A ring-shaped retainer collar 5 that supports the punch spring 4 in a state in which the punch body 2 is penetrated so as to move up and down, and a cylindrical punch guide 6 that supports the punch body 2 so as to be slidable up and down.

  The punch head 3 is screw-engaged with a vertical screw shaft 7 formed at the upper end of the punch body 2, and the punch head 3 is rotated from the upper end of the punch head 3 by rotating the punch head 3 with respect to the punch body 2. The distance to the lower end of the punch body 2 (hereinafter referred to as “punch height”) H can be changed.

  Further, as shown in FIG. 2, the punch head 3 is formed in a C-shaped ring shape having a slit 8 for cutting off a part of the circumference, and a portion cut off by the slit 8 is connected by a bolt 9. By tightening the bolt 9, the punch head 3 is reduced in diameter and the outer periphery of the screw shaft 7 is tightened so that the rotation operation of the punch head 3 is prohibited.

  As shown in FIG. 3, the retainer collar 5 includes a disk-shaped flange portion 10, a short cylindrical portion 11 that extends downward from the inner periphery of the flange portion 10, and a long cylindrical portion that extends upward from the inner periphery of the flange portion 10. The punch spring 4 is supported by the flange portion 10. Further, the neck portion 13 formed on the punch body 2 and expanding downward is locked to the surface facing the neck portion 13 of the short cylinder portion 11 to restrict the upward movement of the punch body 2. Positioning.

  A circumferentially continuous groove 14 is formed on the outer periphery of the short cylindrical portion 11, and a rubber ring member 15 held in the groove 14 continues in the circumferential direction formed on the upper inner periphery of the punch guide 6. The groove 16 is engaged. At this time, the flange portion 10 is supported by the upper end surface of the punch guide 6.

  The punch guide 6 can be removed from the retainer collar 5 by pulling downward from the short tube portion 11 to release the engagement between the groove 16 and the ring member 15, and fitted to the outer periphery of the short tube portion 11. By engaging the groove 16 with the ring member 15, it can be attached to the retainer collar 5.

  The retainer collar 5 is also formed with a circumferentially continuous groove 17 on the outer periphery of the long cylindrical portion 12. The ring member 15 is held in the groove 17, and the long cylindrical portion 12 is turned upside down. The punch guide 6 is fitted to the outer periphery of the groove 16 and the groove 16 is engaged with the ring member 15 so that the punch guide 6 can be detachably attached even when it is turned upside down.

  An operation example at the time of press working by this press die will be described. While the punch guide 6 is supported by a holder (not shown) of a press machine, the punch head 3 is struck by a striker (not shown) of the press machine, and the punch spring 4 is compressed by the struck pressure while the punch body 4 is compressed. 2 is moved downward to bring the cutting edge 1 of the punch body 2 into pressure contact with a workpiece (not shown). Thereafter, when the striker is raised, the punch body 2 is raised by the restoring force of the punch spring 4, and the cutting edge 1 is separated from the workpiece. At this time, the surface of the retainer collar 5 facing the neck portion 13 of the short cylinder portion 11 engages the neck portion 13 of the punch body 2 to restrict the upward movement of the punch body 2, thereby positioning the punch body 2.

  When the cutting edge 1 is worn by repeated pressing, the punch guide 6 is removed from the retainer collar 5 to expose the cutting edge 1, and the lower end of the punch body 2 is polished in this state to regenerate the cutting edge 1. At this time, since the punch height H is reduced in accordance with the polishing amount, the punch head 3 is rotated with the bolt 9 loosened to return the punch height H to the size before polishing.

  When the polishing of the lower end of the punch body 2 is repeated, the amount of rotation of the punch head 3 for keeping the punch height H constant increases, so the height of the punch head 3 with respect to the punch guide 6 increases, and the lower end of the striker The gap at the upper end of the punch head 3 is reduced. In this case, as shown in FIG. 4, by reversing the retainer collar 5 upside down and reassembling, the punch body 2 in a state in which upward movement is restricted by the retainer collar 5 while holding the punch height H is maintained. The position can be shifted downward, whereby a gap between the striker and the punch head 3 can be secured and the lower end of the punch body 2 can be further polished.

  As described above, the press die can be assembled by turning the retainer collar 5 upside down and reassembling, thereby lowering the position of the punch head 3 with respect to the punch body 2 and preventing interference between the punch head 3 and the striker. Therefore, it is possible to secure a margin for polishing the lower end of the punch body 2, and the life of the punch body 2 is long.

Sectional drawing of the press die of embodiment of this invention Sectional view along the line II-II in FIG. Fig. 1 is an enlarged cross-sectional view of the vicinity of the retainer collar FIG. 2 is an explanatory diagram of the retainer collar in FIG. 1, in which the left half shows a state in which the retainer collar in FIG. 1 is assembled without being inverted upside down, and the right half is a state in which the retainer collar in FIG. Illustration

Explanation of symbols

2 Punch body 3 Punch head 4 Punch spring 5 Retainer collar 6 Punch guide 7 Screw shaft 10 Flange 11 Short tube 12 Long tube 13 Neck

Claims (4)

  A ring-shaped punch head (3) threadedly engaged with a vertical screw shaft (7) formed at the upper end of the punch body (2), and a punch spring (4) for urging the punch head (3) upward ), A ring-shaped retainer collar (5) that supports the punch spring (4) with the punch body (2) penetrating through the punch body (2), and a detachable attachment to the retainer collar (5). A cylindrical punch guide (6) that slidably supports the punch body (2) up and down, and the retainer collar (5) expands downward in the punch body (2). In a press mold that locks the diameter neck (13) and restricts the upward movement of the punch body (2), the retainer collar (5) can be turned upside down and incorporated, and turned upside down. Incorporated In a state where the position of the punch body (2) in the state in which the upward movement is restricted by the retainer collar (5) is restricted in the upward movement by the retainer collar (5) incorporated without being turned upside down. A press die characterized in that it is displaced downward from the position of the punch body (2).   The retainer collar (5) includes a flange portion (10) that supports the punch spring (4), a short cylindrical portion (11) that extends downward from the inner periphery of the flange portion (10), and the flange portion (10). ) In the state where the retainer collar (5) is assembled without being turned upside down, the short cylinder portion (11) is the neck portion of the punch body (2). The long tube portion (12) locks the neck (13) of the punch body (2) in a state in which (13) is locked and the retainer collar (5) is turned upside down and incorporated. The press die described in 1.   A ring-shaped punch head (3) threadedly engaged with a vertical screw shaft (7) formed at the upper end of the punch body (2), and a punch spring (4) for urging the punch head (3) upward The punch spring (4) is supported with the punch body (2) penetrating through the punch body (2) and formed on the punch body (2). In the retainer collar (5) that locks the neck (13) that expands downward and restricts the upward movement of the punch body (2), it can be turned upside down and incorporated into the press die. The position of the punch body (2) in a state where it is reversed and incorporated in the press die is lower than the position of the punch body (2) in a state where it is incorporated in the press die without being inverted up and down. A retainer collar, characterized in that it was to be shifted to.   A flange portion (10) that supports the punch spring (4), a short cylindrical portion (11) that extends downward from the inner periphery of the flange portion (10), and an upper portion that extends upward from the inner periphery of the flange portion (10). The short cylinder part (11) is engaged with the neck part (13) of the punch body (2) in a state where the long cylinder part (12) is assembled in the press die without being turned upside down. The retainer collar according to claim 3, wherein the long cylindrical portion (12) engages the neck (13) of the punch body (2) in a state of being inverted and incorporated in the press die.

Images