JP4403024B2 - Screw locking device and punch die having the device - Google Patents

Description

  The present invention relates to a screw locking device and a punch die provided with the device, and more specifically, screwed to a male screw portion formed on an upper portion of a punch body in the punch die so as to be relatively vertically adjustable. The present invention relates to a locking device for locking the punch head and a punch mold having the locking device.

When, for example, a plate-shaped workpiece is punched by a punch die and a die die, the punch blade portion in the punch die gradually wears, so that re-polishing may be performed. When re-polishing in this way, the overall length of the punch die is slightly shortened, so that the punch head is vertically adjusted at the upper end of the punch body provided in the punch die so as to correct the re-polishing amount. They are screwed together (see, for example, Patent Document 1).
JP 63-36934 A

  In a configuration in which a punch head as a nut member is simply screwed so as to be vertically adjustable to a threaded portion formed on the upper part of a punch body in a punch die, the punch head is easily loosened by vibrations. The leading end of the set screw is loosened so as to press against the male screw part, thereby preventing loosening. Moreover, the structure which formed the set screw with which the punch head was provided in the said external thread part is preventing loosening by engaging with an engaging surface.

  That is, in the conventional configuration, in order to prevent the screwed portion (threaded portion) of the punch head from loosening, it is necessary to loosen or tighten the set screw with a tool, which is difficult to operate. There's a problem.

  The present invention has been made in view of the above-described problems, and is supported by a nut member that is movably engaged with a male screw member so as to be movable in a radial direction, and is formed on an outer peripheral surface of the male screw member. A lock piece whose inner end can be engaged with a longitudinal groove; a lock piece urging means for urging the lock piece inward; and a rotation piece provided on the outer periphery of the nut member. A lock ring having an inner peripheral surface with a movement allowing portion that allows movement in the outer direction and a movement regulating portion that regulates movement of the lock piece in the outer direction, and the lock piece and the movement regulating portion are always And a fixed position returning means for rotating and returning the lock ring to a fixed position in an opposed state.

  Further, the present invention is a punch mold provided with a male screw part formed on the upper part of the punch body and screwed into a punch head so as to be relatively movable, and is supported by the punch head so as to be movable in the radial direction. A locking piece whose inner end can be engaged with a longitudinal groove formed on the outer circumferential surface of the male threaded portion, a locking piece urging means for urging the locking piece inward, and an outer circumference of the punch head A lock ring provided on the inner peripheral surface with a movement allowing portion for allowing the lock piece to move outward and a movement restricting portion for restricting the lock piece to move outward. And a fixed position returning means for rotating and returning the lock ring to a fixed position where the lock piece and the movement restricting portion are always opposed to each other.

  In the punch mold, the upper surface of the lock ring is provided lower than the upper surface of the punch head.

  According to the present invention, in a state where the movement of the lock piece in the outward direction is restricted, the male screw member and the nut member are integrated via the lock piece, so that the screw can be prevented from loosening. Then, when the movement of the lock piece in the outward direction is allowed, the nut member can be rotated with respect to the male screw member.

  The restriction and allowance of the movement of the lock piece in the outward direction can be performed by rotating a lock ring provided with a movement restricting portion and a movement allowing portion on the inner peripheral surface, so that it is easy without using a tool. Locking can be performed.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. As an example of a screw locking device, a case where the device is applied to a portion where a punch head of a punch mold is adjusted will be exemplified.

  Referring to FIG. 1, a punch die 1 according to this embodiment includes a cylindrical punch guide 3 that is supported by a die holder in a punch press (not shown) so as to be movable up and down. At the lower end of the punch guide 3, there is provided a plate presser 5 that is detachable in the lateral direction through an opening formed in the lower end (in the direction perpendicular to the axis).

  The plate retainer 5 is provided with an elastic ring 7 such as an O-ring and a washer or the like in order to absorb a minute clearance between the plate retainer 5 and closely contact the plate retainer 5 with the punch guide 3. A ring member 9 is provided. Therefore, in a state where the plate presser 5 is mounted on the punch guide 3, the elastic ring 7 is elastically deformed and absorbs a minute clearance between the punch guide 3 and the plate presser 5 and is in close contact.

  A flange 11 is provided on the upper portion of the punch guide 3, and a retainer collar 13 is detachably mounted on the upper portion of the flange 11. That is, the retainer collar 13 is fitted to the outside of the cylindrical protrusion 15 protruding upward from the flange 11. On the inner peripheral surface of the retainer collar 13, there is an elastic lock piece 17 such as a wire partly engageable and disengageable with an engaging recess 15 </ b> A such as a circumferential groove formed on the outer peripheral surface of the cylindrical protrusion 15. Is provided.

  In order to press the elastic lock piece 17 inward in order to engage the elastic lock piece 17 with the engagement recess 15A, a plurality of places such as balls are pressed on the retainer collar 13 The piece 19 is provided so as to be movable in the radial direction (radial direction). A rotating ring 21 is rotatably fitted to the outside of the retainer collar 13, and the elastic lock piece 17 is attached to the inner peripheral surface of the rotating ring 21 via the pressing piece 19. A pressing holding portion 21A that holds the pressing state inward is provided. Further, a concave pressing piece receiving portion 21 </ b> B capable of receiving the pressing piece 19 without pressing the elastic locking piece 17 is formed on the inner peripheral surface of the rotating ring 21.

  With the above configuration, the pressing piece 19 is pressed inwardly against the elasticity of the elastic lock piece 17 by the pressing holding portion 21A on the inner peripheral surface of the rotating ring 21, and a part of the elastic lock piece 17 is pushed into the cylindrical protruding portion. The retainer collar 13 is fixed so as not to move in the axial direction (vertical direction in FIG. 1) with respect to the punch guide 3 by engaging with the 15 engaging recesses 15.

  When the rotating ring 21 is rotated and the pressing piece 19 and the pressing piece receiving portion 21B formed on the inner peripheral surface of the rotating ring 21 are held in a corresponding relationship, the elasticity of the elastic lock piece 17 is maintained. Accordingly, the pressing piece 19 is moved outward so as to engage with the pressing piece receiving portion 21B, so that the elastic lock piece 17 returns to the original state and is detached from the engaging concave portion 15A of the cylindrical protruding portion 15. . Accordingly, the retainer collar 13 can be removed upward relative to the punch guide 3 in FIG.

  As can be understood from the above description, the retainer collar 13 can be fixed to the punch guide 3 and can be released by rotating the rotating ring 21. That is, the retainer collar 13 can be easily attached to and detached from the punch guide 3 by a simple operation of rotating the rotating ring 21.

  The retainer collar 13 is fitted with a lower end portion of a cylindrical punch head 23 so as to be movable up and down, and a stopper 25 is attached to the lower end portion of the punch head 23 to prevent it from coming off upward. The punch head 23 forms a kind of nut member, and an internal thread portion 27 is formed on the inner peripheral surface near the upper portion. A powerful stripper spring 29 is mounted between the enlarged portion 23 </ b> A provided on the upper portion of the punch head 23 and the retainer collar 13.

  Inside the punch guide 3, a punch body 33 having a punch blade portion 31 at its lower end is fitted so as to be movable up and down. The punch body 33 forms a kind of male screw member, and the upper portion of the punch body 33 is fitted into the punch head 23. The upper end portion of the punch body 33 is formed with a male screw portion 35 that is screwed into the female screw portion 27 formed on the punch head 23.

  Therefore, when the punch blade 33 is worn and re-polished, the length of the punch body 33 is slightly shortened, so that the punch head 23 is rotated relative to the punch body 33. The screwed state between the female threaded portion 27 of the punch head 23 and the male threaded portion 35 of the punch body 33 is adjusted. By this adjustment, the length dimension (height dimension) from the upper surface 23B of the punch head 23 to the punch blade portion 31 can always be adjusted to a constant dimension.

  In addition, the said punch body 33 is illustrated by the structure provided with the whole from the said punch blade part 31 to the said external thread part 35 integrally. However, as a configuration of the punch body 33, the portion provided with the punch blade portion 31 and the portion provided with the male screw portion 35 are configured separately, and both portions are integrated by an appropriate fixing tool such as a bolt. It is also possible to adopt a configuration.

  As described above, in order to prevent loosening after adjusting the threaded state of the female threaded portion 27 of the punch head 23 with respect to the male threaded portion 35 of the punch body 33, a screw locking device is provided.

  More specifically, the enlarged portion 23A of the punch head 23 has a plurality of inner end portions engageable with a plurality of longitudinal grooves 37 (see FIG. 2) formed in the male screw portion 35 of the punch body 33. The lock piece 39 is provided to be movable in the radial direction (radial direction). The lock piece 39 is urged inward by a lock piece urging means 41 such as a coil spring or the like housed in the enlarged portion 23A.

  A lock ring 43 whose upper surface is slightly lower than the upper surface of the punch head 23 (upper surface 23B of the enlarged portion 23) is rotatably provided on the outer peripheral surface of the enlarged portion 23A of the punch head 23. The inner peripheral surface of the lock ring 43 is provided with a plurality of movement restricting portions 45 that are in contact with the outer end of the lock piece 39 and restrict the movement of the lock piece 39 in the outer direction at equal intervals. Movement permitting portions 47 that allow the lock pieces 39 to move outward are provided between the respective movement restricting portions 45 at equal intervals.

  The movement restricting portion 45 provided in the lock ring 43 is positioned opposite to the outer end portion of the lock piece 39 when the inner end portion of the lock piece 39 is engaged with the groove 37 of the male screw portion 35. There are portions that restrict the movement of the lock piece 39 in the outward direction, and are provided at equal intervals in the circumferential direction. The movement allowing portion 47 provided in the lock ring 43 is locked so that the inner end portion of the lock piece 39 can be detached from the groove 37 when it is in a position facing the outer end portion of the lock piece 39. The portions 39 are allowed to move in the outward direction, and are arranged at regular intervals in the circumferential direction and between the movement restricting portions 45. In the present embodiment, the outer end portion of the lock piece 39 is illustrated as a through hole that can enter. However, the movement permitting portion 47 is not limited to the through hole, and may be configured such that a recess is formed on the inner peripheral surface of the lock ring 43.

  The screw locking device includes a fixed position holding means 49 that holds the movement restricting portion 45 of the lock ring 43 at a fixed position that always faces the lock piece 39 and restricts the outward movement. ing. Further, the screw locking device includes a fixed position returning means for automatically returning the lock ring 43 to the fixed position when the lock ring 43 is rotated with respect to the enlarged portion 23A of the punch head 23. 51 (see FIG. 3).

  More specifically, the fixed position holding means 49 engages an engagement piece 55 such as a ball engageable with an engagement recess 53 formed on an inner peripheral surface of the lock ring 43 with the engagement recess 53. It is composed of a locking means 57 such as a ball plunger that is urged in the mating direction. Although the case where the locking means 57 is provided in the enlarged portion 23A is illustrated, the location where the engaging recess 53 and the locking means 57 are provided is relative, and the engaging recess is formed on the outer peripheral surface of the enlarged portion 23A. 53 may be formed, and the lock ring 43 may be provided with the lock means 57.

  When the engagement piece 55 of the lock means 57 is engaged with the engagement recess 53, the inner end portion of the lock piece 39 is formed in the groove 37 of the male screw portion 35 as shown in FIG. The outer end portion of the lock piece 39 and the movement restricting portion 45 of the lock ring 43 face each other, and the movement of the lock piece 39 in the outward direction is restricted. That is, the enlarged portion 23A of the punch head 23 is fixed to the male screw portion 35 of the punch body 33, and the screw portion is prevented from loosening.

  The fixed position return means 51 includes a first elastic member 59A such as a spring that urges the lock ring 43 in the clockwise direction (forward rotation direction) with respect to the enlarged portion 23A, and the lock ring 43 counterclockwise. The second elastic member 59B biased in the rotation direction (reverse rotation direction) is provided.

  The first and second elastic members 59A and 59B are housed in an outer peripheral groove 23C (see FIG. 1) formed on the outer peripheral surface of the enlarged portion 23A of the punch head 23. One end face (opposing face) where the elastic members 59A and 59B face each other is in contact with a regulation pin 61 (see FIG. 3) protruding from the inner peripheral face of the lock ring 43. The other end surfaces of the first and second elastic members 59A and 59B are in contact with fixing pins 63A and 63B that protrude outward from the enlarged portion 23A and are spaced apart from each other.

  The lock ring 43 includes both the fixing pins 63A, when the lock ring 43 is rotated in the clockwise direction and the counterclockwise direction in order to restrict the rotation of the lock ring 43 with respect to the enlarged portion 23A. A stopper pin 65 that can come into contact with 63B is provided.

  In the configuration as described above, the punch die 1 is used by attaching the punch guide 3 to a punch holder in a punch press so as to be movable up and down, and a ram (striker) provided to the punch press so as to be movable up and down. Thus, the upper surface 23B of the punch head 23 is struck. At this time, since the upper surface of the lock ring 43 is provided lower than the upper surface 23B of the punch head 23, the lock ring 43 is not directly pressed by the striker. Accordingly, the lock ring 43 is not subjected to deformation or the like, and can always be favorably rotated with respect to the enlarged portion 23A of the punch head 23.

  When the punch blade 31 is worn due to the use of the punch die 1, the punch die 1 is taken out from the punch holder of the punch press, and the retainer collar 13 is removed from the punch guide 3 as described above. Thereafter, the internal thread portion 27 in the punch head 23 and the external thread portion 35 in the punch body 33 are unscrewed, the punch body 33 is taken out, and the punch blade portion 31 is re-polished. After re-polishing the punch blade 31, the male threaded portion 35 of the punch body 33 is re-engaged with the female threaded portion 27 of the punch head 23 to return to the initial state and the punch mold 1 is reused. .

  As described above, when the female screw portion 27 in the punch head 23 and the male screw portion 35 provided in the punch body 33 are screwed and released, it is necessary to release the fixed state in the locking device. Therefore, the following operations are performed to perform the screwing and releasing of the female screw portion 27 and the male screw portion 35.

  As shown in FIG. 2A, the inner end portion of the lock piece 39 engages with the groove 37 of the male screw portion 35, and the movement restricting portion 45 of the lock ring 43 restricts the outward movement of the lock piece 39. The state in which the engagement piece 55 provided in the fixed position holding means 49 is engaged with the engagement recess 53 of the lock ring 43 is a state in which the punch body 33 and the punch head 23 are integrally fixed. At this time, as shown in FIG. 3A, the first and second elastic members 59A and 59B are substantially equal in length, and the lock ring 43 is substantially equal in the clockwise direction and the counterclockwise direction. It is energized by force.

  Therefore, the female screw portion 27 and the male screw portion 35 are in a locked state in which relative rotation is impossible, that is, in a locking prevention state.

  As described above, when in the locking prevention state, the lock ring 43 is gripped, and the lock ring 43 is rotated clockwise with respect to the enlarged portion 23A of the punch head 23 as shown in FIG. Then, the first elastic member 59A expands and the second elastic member 59B is compressed and contracted. Then, when the stopper pin 65 provided in the lock ring 43 comes into contact with the one fixing pin 63A, the clockwise rotation is restricted.

  As described above, when the stopper pin 65 comes into contact with the one fixing pin 63A, the outer end of the lock piece 39 provided in the enlarged portion 23A of the punch head 23 and the lock ring 43 are brought into contact with each other as shown in FIG. The provided movement allowance portion 47 faces and the lock piece 39 is movable outward.

  Therefore, when the lock pin 43 is further rotated in the clockwise direction while the stopper pin 65 is in contact with the one fixing pin 63A, the inner end portion of the lock piece 39 is detached from the groove 37 of the male screw portion 35. To do.

  Therefore, the female screw portion 27 of the punch head 23 can be rotated clockwise with respect to the male screw portion 35 of the punch body 33, and the screwed state of the punch body 33 and the punch body 23 can be adjusted.

  When the lock ring 43 is released after the inner end of the lock piece 39 is engaged with the groove 37 at an appropriate position, the compressed second elastic member 59B expands. It is automatically rotated in the clockwise direction. That is, the lock ring 43 is automatically returned to the initial fixed position shown in FIG. That is, a state in which the female screw portion 27 is fixed to the male screw portion 35 so as not to rotate is automatically obtained.

  Note that when the punch head 23 is rotated counterclockwise with respect to the punch body 33, the operation according to the above-described operation is performed, and therefore the punch head 23 is rotated counterclockwise. Description of is omitted.

  As understood from the above description, the punch body 33 and the punch head 23 are rotated by rotating the female thread portion 27 of the punch head 23 clockwise or counterclockwise with respect to the male thread portion 35 of the punch body 33. Can be easily adjusted without using a tool.

  Then, after adjusting the screwed state of the male screw part 35 and the female screw part 27, the female screw part 27 is automatically held in a fixed state in which relative rotation of the female screw part 27 is impossible with respect to the male screw part 35. The male screw part 35 and the female screw part 27 can be easily locked.

  In addition, as the screw locking device, the case where the male screw portion 35 of the punch body 33 and the female screw portion 27 of the punch head 23 are prevented from loosening in the punch die is illustrated. However, the screw locking device can be applied to various screw mechanisms configured to screw the male screw portion and the female screw portion.

It is a section explanatory view showing composition at the time of applying a screw locking device to a punch metallic mold and a punch metallic mold concerning an embodiment of the present invention. It is action | operation explanatory drawing of the cross section along the (2)-(2) line | wire in FIG. It is action | operation explanatory drawing of the cross section along the (3)-(3) line | wire in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Punch die 3 ... Punch guide 23 ... Punch head 23A ... Enlarged part 23B ... Upper surface 23C ... Outer peripheral groove 25 ... Stopper 27 ... Female thread part 31 ... Punch blade part 33 ... Punch body 35 ... Male thread part 37 ... Groove 39 ... Lock Piece 41 ... Lock piece urging means 43 ... Lock ring 45 ... Movement restricting section 47 ... Movement permitting section 49 ... Fixed position holding means 51 ... Fixed position returning means 57 ... Lock means 59A ... First elastic member 59B ... Second elastic member 61 ... Regulating pins 63A, B ... Fixing pins 65 ... Stopper pins

Claims (3)

  A lock piece that is supported by a nut member that is movably engaged with a male screw member so as to be movable in a radial direction, and whose inner end portion can be engaged with a longitudinal groove formed on an outer peripheral surface of the male screw member; A lock piece urging means for urging the lock piece inward, a movement allowing portion provided on the outer periphery of the nut member and allowing movement of the lock piece in an outward direction; and In order to rotate and return the lock ring to a fixed position where a lock ring having a movement restricting portion for restricting movement in the outer direction is provided on the inner peripheral surface, and the lock piece and the movement restricting portion are always facing each other. And a fixed position returning means.   A punch mold having a male screw part formed on an upper part of a punch body and screwed with a punch head so as to be relatively movable. The punch die is supported by the punch head so as to be movable in a radial direction. A locking piece whose inner end can be engaged with a longitudinal groove formed on the surface; a locking piece urging means for urging the locking piece inward; and a rotatable on the outer periphery of the punch head. A lock ring provided on an inner peripheral surface with a movement allowing portion for allowing movement of the lock piece in the outward direction and a movement restricting portion for restricting movement of the lock piece in the outward direction, the lock piece, A punch die having a fixed position returning means for rotating and returning the lock ring to a fixed position in a state where the movement restricting portion always faces. 3. The punch die according to claim 2, wherein an upper surface of the lock ring is provided lower than an upper surface of the punch head.

Images