JP6739319B2 - Die mold for forming protrusions, mold set, and punch mold - Google Patents

Description

The present invention relates to a die mold or the like used when forming a projection for relative positioning of a second sheet metal on one surface of a sheet metal (first sheet metal).

For example, when manufacturing a sheet metal product such as a box-shaped sheet metal product, the second sheet metal is abutted against the protrusion formed on one surface of the sheet metal (first sheet metal), and the Positioning may be performed. Therefore, conventionally, a die die for forming a protrusion has been developed that can form a protrusion on one surface of a sheet metal (see Patent Document 1). Then, the structure of a conventional die die for forming protrusions will be briefly described as follows.

The die die for forming the protrusion has a cylindrical die body, and the die body integrally has a cylindrical die chip at the center of the upper surface thereof. The outer diameter of the base end portion (lower portion) of the die chip is larger than the outer diameter of the tip end portion (upper portion) of the die chip. Further, the die body is provided with a disc-shaped ejector for separating the protrusion from the die chip on the upper side thereof so as to be able to move up and down. A chip hole for inserting a die chip is formed through the central portion of the ejector. The inner diameter of the lower portion of the tip hole is larger than the inner diameter of the upper portion of the tip hole. Further, the die body is provided with a coil spring which biases the ejector upward at an appropriate position.

The die chip is configured to project upward with respect to the upper surface of the ejector when the ejector descends while resisting the biasing force of the coil spring by the descending operation of the punch body in the punch die for forming a protrusion. Then, when the die die for forming the protrusions is pushed upward with respect to the upper surface of the ejector with one surface of the sheet metal being pressed against the upper surface of the ejector, a part of the sheet metal is above the chip hole. It is configured to flow between the inner peripheral surface of the portion and the outer peripheral surface of the tip portion of the die chip. Therefore, in a state where the sheet metal is sandwiched between the punch body and the ejector by the biasing force of the coil spring, an annular shape defined by one surface of the sheet metal, the inner peripheral surface of the upper portion of the chip hole and the outer peripheral surface of the tip portion of the die chip. Part of the sheet metal will flow into the cavity.

As prior arts related to the present invention, in addition to Patent Document 1, there are Patent Documents 2 and 3.

JP 2005-40832 A JP 2005-153014 A JP, 9-85358, A

By the way, the annular cavity communicates between the inner peripheral surface of the lower side portion of the chip hole and the outer peripheral surface of the base end portion of the die chip, and the lower side of the annular cavity is open. Therefore, when forming a protrusion using a die mold for forming a protrusion, it is not possible to sufficiently fill a part of the sheet metal into the annular cavity, which may result in defective formation of the protrusion. That is, there is a problem that it is not easy to stably form the protrusion on one surface of the sheet metal by using a die die for forming the protrusion.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a die die for forming a protrusion having a novel structure, which can solve the above-mentioned problems.

A first aspect of the present invention is a die mold used for forming a protrusion for relative positioning of a second sheet metal on one surface of a sheet metal (first sheet metal) (for forming a protrusion). A die die), a die body, a die chip provided on an upper surface of the die body, an ejector provided on the upper side of the die body so as to be able to move up and down, and a chip hole for inserting the die chip, A biasing member that biases the ejector upward, and the die chip projects upward with respect to an upper surface of the ejector when the ejector descends while resisting the biasing force of the biasing member. And a recess having a shape corresponding to the protrusion is formed at the tip (upper end) of the die chip, and the die chip is attached to the upper surface of the ejector with one surface of the metal plate being pressed against the upper surface of the ejector. With respect to the above, a part of the sheet metal is configured to flow between the inner surface of the chip hole and the inner surface of the recess when it is projected upward.

A second aspect of the present invention is a mold set used for forming a protrusion for relative positioning of the second sheet metal on one surface of the sheet metal (first sheet metal) (for forming a protrusion). A die set) comprising a die die for forming a projection according to the first aspect of the present invention, a punch body for pressing a sheet metal from above, and a punch head provided at an upper end portion of the punch body. And a punch die for forming a projection.

According to the first or second aspect of the present invention, the sheet metal is moved in the horizontal direction relative to the die die or the like with one surface of the sheet metal facing downward. Accordingly, the sheet metal can be relatively positioned so that a predetermined portion of one surface of the sheet metal is located above the die chip.

After the sheet metal is positioned, the punch head is pressed from above by a striker in a punch press to lower the punch body. Then, the punch body presses the sheet metal from above, so that one surface of the sheet metal is pressed against the upper surface of the ejector. Further, in a state in which one surface of the sheet metal is pressed against the upper surface of the ejector, the ejector is lowered by the lowering operation of the punch body while resisting the urging force of the urging member, and the die chip is placed on the upper surface of the ejector. To the upper direction. Then, a part of the sheet metal flows between the inner surface of the chip hole and the inner surface of the recess. Thus, the protrusion can be formed on a predetermined portion of one surface of the sheet metal.

In short, as described above, the die chip is configured to project upward with respect to the upper surface of the ejector when the ejector descends while resisting the urging force of the urging member. Then, in the die die, when one surface of the sheet metal is pressed against the upper surface of the ejector and the die chip is projected upward with respect to the upper surface of the ejector, a part of the sheet metal becomes the chip hole. It is configured to flow between the inner surface and the inner surface of the recess. Therefore, in a state where the sheet metal is sandwiched by the punch body and the ejector by the urging force of the urging member, a closed state (closed state is defined by one surface of the sheet metal, the inner surface of the chip hole, and the inner surface of the recess). Part of the sheet metal will flow into the (state) cavity.

A third aspect of the present invention is a punch die used for forming a protrusion for relative positioning of a second sheet metal on one surface of a sheet metal (first sheet metal) (for forming a protrusion). (Punch die), a cylindrical punch guide having a chip hole formed in the lower surface thereof, and a lift guide provided inside the punch guide so as to be movable up and down with respect to the punch guide so as not to rotate about an axis. A punch body, a punch tip provided at a lower end portion (lower surface) of the punch body and capable of being inserted into the tip hole, a punch head provided at an upper end portion of the punch body, and the punch body in an upward direction. An urging member for urging the punch tip, and the punch tip moves downward with respect to the lower surface of the punch guide when the punch body descends with respect to the punch guide while resisting the urging force of the urging member. Is formed so as to project in a direction, a concave portion having a shape corresponding to the projection is formed at the tip end portion (lower end portion) of the punch tip, and the lower surface of the punch guide is pressed against one surface of the sheet metal, When the punch tip is projected downward with respect to the lower surface of the punch guide, a part of the sheet metal is configured to flow between the inner surface of the tip hole and the inner surface of the recess.

A fourth aspect of the present invention is a mold set used for forming a projection for relative positioning of the second sheet metal on one surface of the sheet metal (first sheet metal) (for forming a projection). A die set) comprising a punch die for forming protrusions according to the third aspect of the present invention and a die die for forming protrusions.

According to the third or fourth aspect of the present invention, the sheet metal is moved horizontally relative to the punch die or the like with one surface of the sheet metal facing upward. Thus, the sheet metal can be positioned so that a predetermined portion of one surface of the sheet metal is located below the punch tip.

After the sheet metal is positioned, the punch head is pressed from above by a striker in a punch press to lower the punch body. Then, the punch guide is lowered together with the punch body, and the lower surface of the punch guide is pressed against one surface of the sheet metal. Further, with the lower surface of the punch guide pressed against one surface of the sheet metal, the punch body is lowered against the punch guide against the biasing force of the biasing member, and the punch tip is punched. The lower surface of the guide is projected downward. Then, a part of the sheet metal flows between the inner surface of the chip hole and the inner surface of the recess. Thus, the protrusion can be formed on a predetermined portion of one surface of the sheet metal.

In short, as described above, the punch tip projects downward with respect to the lower surface of the punch guide when the punch body descends with respect to the punch guide while resisting the urging force of the urging member. Is configured. Then, in the punch die, when the punch tip is projected downward with respect to the lower surface of the punch guide in a state where the lower surface of the punch guide is pressed against one surface of the sheet metal, part of the sheet metal is It is configured to flow between the inner surface of the chip hole and the inner surface of the recess. Therefore, in a state where the sheet metal is sandwiched by the punch guide and the die die by the urging force of the urging member, the closed state is defined by one surface of the sheet metal, the inner surface of the chip hole and the inner surface of the recess. Part of the sheet metal will flow into the (closed) cavity.

According to the first or second aspect of the present invention, as described above, the sheet metal is sandwiched between the punch body and the ejector by the urging force of the urging member, and a part of the sheet metal is closed. It will flow into the cavity. Therefore, according to the first or second aspect of the present invention, a part of a sheet metal is sufficiently filled in the cavity, and a protrusion is stably formed on one surface of the sheet metal by using the die mold or the like. can do.

According to the third or fourth aspect of the present invention, in a state where the sheet metal is sandwiched by the punch guide and the die die by the urging force of the urging member, a part of the sheet metal is inserted into the closed cavity. It will flow. Therefore, according to the third or fourth aspect of the present invention, a part of the sheet metal is sufficiently filled in the cavity, and a protrusion is stably formed on one surface of the sheet metal by using the punch die or the like. can do.

FIG. 1 is a cross-sectional view showing a mold set for forming protrusions according to the first embodiment of the present invention. FIG. 2A is an enlarged plan view of the periphery of the protrusion formed on one surface of the sheet metal, and FIG. 2B is an enlarged cross-sectional view of the periphery of the protrusion formed on one surface of the sheet metal. FIG. 3 is a sectional view showing a die die for forming a protrusion according to the first embodiment of the present invention. 4A is a plan view of a die body provided with a die chip, FIG. 4B is a sectional view taken along line BB in FIG. 4A, and FIG. 4C is a partial perspective view of the die chip. It is a figure. FIG. 5A is an enlarged cross-sectional view showing a state in which one surface of the sheet metal is pressed against the upper surface of the ejector and immediately before the die chip is projected upward with respect to the upper surface of the ejector. FIG. 5B is an enlarged cross-sectional view showing a state where one surface of the sheet metal is pressed against the upper surface of the ejector and the die chip is projected upward with respect to the upper surface of the ejector. FIG. 6 is a sectional view showing a mold set for forming protrusions according to the second embodiment of the present invention. FIG. 7 is a cross-sectional view showing a punch die for forming protrusions according to the first embodiment of the present invention. FIG. 8A is an enlarged cross-sectional view showing a state in which the lower surface of the punch plate is pressed against one surface of the sheet metal and immediately before the punch chip is projected downward with respect to the lower surface of the punch plate. FIG. 8B is an enlarged cross-sectional view showing a state where the lower surface of the punch plate is pressed against one surface of the sheet metal and the punch chip is projected downward with respect to the lower surface of the punch plate.

Embodiments of the present invention (first embodiment and second embodiment) will be described with reference to the drawings.

In the specification and claims of the present application, “provided” includes not only being directly provided but also indirectly provided through another member, and “providing” Is synonymous with. “Providing” includes not only providing directly but also indirectly providing through another member, and is synonymous with “providing”. Unless otherwise specified, the "axial center" means the axial center of a die mold or a punch mold for forming a protrusion. In the drawings, "U" indicates upward and "D" indicates downward. For convenience of description, in FIGS. 1, 3, and 5(a) and 5(b), the cross section of the die body including the die chip is the same as the cross section taken along the line BB in FIG. 4(a).

(First embodiment of the present invention)
As shown in FIGS. 1 and 2A and 2B, the mold set 1 for forming protrusions according to the first embodiment of the present invention is configured such that an end of one surface Pa of a sheet metal (first sheet metal) P is formed. It is used when forming a plurality of (only one is shown) protrusions N for performing relative positioning of the second sheet metal W on the part side, and includes a die die 3 and a punch die 5 for forming protrusions. Is becoming Further, the die die 3 for forming the protrusion is detachably attached to the attachment hole 11 of the die die holder 9 attached to the lower turret 7 as the lower attachment base in the punch press. A part of the die die 3 for forming the protrusion is located in the through hole 13 formed in the lower turret 7. The punch die 5 for forming a protrusion is detachably mounted in a mounting hole 17 of an upper turret 15 as an upper mounting base in a punch press.

Here, the sheet metal P and the second sheet metal W are constituent members of a sheet metal product (not shown) such as a box-shaped sheet metal product, and each protrusion N is a protrusion perpendicular to one surface Pa of the sheet metal P. It has a contact portion Ns. Relative positioning of the second sheet metal W is performed with the one surface Wa of the second sheet metal W in a state where the end surface We of the second sheet metal W and the end portion side of the one surface Pa of the sheet metal P are in contact with each other. It is performed by relatively abutting the abutting portion Ns of each protrusion N. Further, after the relative positioning of the second sheet metal W, the boundary portion is formed between the end surface Pe of the sheet metal P and a part of the end surface We of the second sheet metal W (the portion protruding from the one surface Pa of the sheet metal P). By performing welding such as laser welding along the longitudinal direction, the sheet metal P and the second sheet metal W are joined via the welding beads J. The other surface Pa of the sheet metal P and the other surface Wa of the second sheet metal W correspond to the appearance surface of the sheet metal product.

Next, details of the configuration of the die die 3 for forming a protrusion according to the first embodiment of the present invention will be described.

As shown in FIG. 1, FIG. 3, and FIGS. 4A, 4</b>B, and 4</b>C, the die die 3 for forming a projection includes a columnar (disc-shaped) die body (die body) 19. The die body 19 is detachably mounted in the mounting hole 11 of the die mold holder 9. Further, the die body 19 is configured to be non-rotatable around an axis (axis of the die die 3) C with respect to the mounting hole 11 of the die die holder 9 by the engagement action of the key 21 and the key groove 23. ing. The key 21 is provided at an appropriate position on the outer peripheral surface of the die body 19, and the key groove 23 is formed on the peripheral edge of the mounting hole 11 of the die mold holder 9 so as to extend in the vertical direction. The key 21 may be provided at an appropriate position on the periphery of the mounting hole 11 of the die mold holder 9, and the key groove 23 may be formed on the outer peripheral surface of the die body 19 so as to extend in the vertical direction.

A plurality of stepped first guide holes 25 are formed penetrating the peripheral edge portion (a portion around the central portion) of the die body 19, and the plurality of first guide holes 25 are formed in the circumferential direction (the die body 19). Are arranged at equal intervals along the circumferential direction). Further, a plurality of second guide holes 27 are formed so as to penetrate the peripheral edge portion of the die body 19, and the plurality of second guide holes 27 are arranged at equal intervals along the circumferential direction. The first guide holes 25 and the second guide holes 27 are alternately arranged along the circumferential direction.

The die body 19 is integrally provided with a cylindrical die chip 29 at the center of its upper surface. The die chip 29 may be detachably attached to the die body 19. The characteristic part of the die chip 29 will be described later.

The die body 19 is provided with a disc-shaped ejector 31 for separating the protrusion N from the die chip 29 on the upper side thereof so as to be able to move up and down (movable in the vertical direction). Further, a chip hole (insertion hole) 33 for inserting the die chip 29 is formed at the center of the ejector 31 so as to penetrate therethrough.

The die body 19 is provided with a connecting bolt 35 capable of moving up and down in each first guide hole 25, and an upper end portion of each connecting bolt 35 is fixed to the ejector 31 by screwing. The die body 19 is provided with slide pins (guide pins) 37 capable of moving up and down in the respective second guide holes 27, and the upper ends of the slide pins 37 are fixed to the ejectors 31 by screwing. In other words, the ejector 31 is provided on the upper side of the die body 19 so as to be vertically movable and non-separable via the plurality of connecting bolts 35 and the plurality of slide pins 37.

As shown in FIG. 1 and FIG. 3, the die body 19 is provided with a mounting bolt 39 screwed to the central portion of the lower surface thereof, and the mounting bolt 39 is located in the through hole 13 of the lower turret 7. There is. Further, the mounting bolt 39 has an annular spring seat 41 at the lower end thereof. The mounting bolt 39 includes a pipe-shaped spacer 43 between the die body 19 and the spring seat 41 on the outer peripheral surface side. Further, the spacer 43 is provided with a support ring 45, which supports the lower surfaces (lower ends) of the plurality of slide pins 37, on the upper end side thereof so as to be able to move up and down. The spacer 43 is urged to urge the ejector 31 upward while the support ring 45 is pressed against the lower surfaces of the plurality of slide pins 37 between the support ring 45 and the spring seat 41 on the outer peripheral surface side. The coil spring 47 is provided as a member. In other words, the coil spring 47 is provided on the lower side (lower surface) of the die body 19 via the mounting bolt 39 and the spacer 43.

As shown in FIGS. 3 and 5A and 5B, when the ejector 31 descends against the biasing force of the coil spring 47, the die chip 29 projects upward with respect to the upper surface of the ejector 31. It is configured. Further, the ejector 31 (the lower surface of the ejector 31) is configured to abut against the upper surface of the die body 19 when the die chip 29 is projected upward with respect to the upper surface of the ejector 31.

As shown in FIGS. 3, 4(a), (b), (c), and FIGS. 5(a), (b), a concave portion 49 having a shape corresponding to the protrusion N is formed at the tip portion (upper end portion) of the die chip 29. Has been formed. Then, in the die die 3, when the die chip 29 is projected upward with respect to the upper surface of the ejector 31 in a state where the end portion side of one surface Pa of the sheet metal P is pressed against the upper surface of the ejector 31, A part thereof is configured to flow between the inner surface of the tip hole 33 and the inner surface of the recess 49.

Next, the details of the configuration of the punch die 5 for forming the protrusion according to the first embodiment of the present invention will be described.

As shown in FIG. 1, the punch die 5 for forming a projection includes a punch body 51 that presses the sheet metal P from above, and the punch body 51 can move up and down in the mounting hole 17 of the upper turret 15. It is designed to be detachably attached. Further, the punch body 51 is supported by a plurality of lifter springs (not shown) attached to the periphery of the mounting hole 17 of the upper turret 15.

The punch body 51 is configured to be non-rotatable around the axis C (axis of the punch die 5) C with respect to the mounting hole 17 of the upper turret 15 by the engaging action of the key 53 and the key groove 55. The key 53 is provided at an appropriate position on the periphery of the mounting hole 17 of the upper turret 15, and the key groove 55 is formed at an appropriate position on the outer peripheral surface of the punch body 51 so as to extend in the vertical direction. The punch body 51 may be configured to be rotatable about the axis C with respect to the mounting hole 17 of the upper turret 15 by omitting the key 53 and the key groove 55.

As shown in FIGS. 1 and 5A and 5B, the punch body 51 is integrally provided with a punch head 57 at the upper end thereof, and the punch head 57 is moved upward by a striker 59 in the punch press. It is designed to be pressed (pressed) from. Further, a step portion (step portion) 61 is formed on the lower surface of the punch body 51 so as to project downward. Further, a spherical convex portion (pressing portion) 63 that presses the sheet metal P from above is formed at a portion of the step portion 61 of the punch body 51 that vertically opposes the die chip 29 so as to project downward. The convex portion 63 may be formed in an arc shape instead of the spherical shape.

Subsequently, the operation and effect of the first embodiment of the present invention will be described.

With one surface Pa of the sheet metal P facing downward, the sheet metal P is moved in the horizontal direction relative to the die die 3 and the like. Thereby, the relative positioning of the sheet metal P can be performed such that the predetermined portion (the predetermined portion on the end side) of the one surface Pa of the sheet metal P is located above the die chip 29.

After the sheet metal P is positioned, the punch head 57 is pressed from above by the striker 59, and the punch body 51 is lowered while resisting the biasing force of the plurality of lifter springs. Then, the punch body 51 presses the sheet metal P from above, and presses the end portion side of one surface Pa of the sheet metal P against the upper surface of the ejector 31. Further, with the end portion side of the one surface Pa of the sheet metal P being pressed against the upper surface of the ejector 31, the ejector 31 is lowered by the lowering operation of the punch body 51 while resisting the biasing force of the coil spring 47, and the die chip 29. Are projected upward with respect to the upper surface of the ejector 31. Then, the ejector 31 abuts on the upper surface of the die body 19, and part of the sheet metal P flows between the inner surface of the chip hole 33 and the inner surface of the recess 49.

Accordingly, the protrusion N can be formed on a predetermined portion of the one surface Pa of the sheet metal P while maintaining the flatness of the portion of the one surface Pa of the sheet metal P closer to the end surface Pe than the predetermined portion.

In short, as described above, the die chip 29 is configured to project upward with respect to the upper surface of the ejector 31 when the ejector 31 descends against the biasing force of the coil spring 47. Then, in the die die 3, when one surface of the sheet metal P is pressed against the upper surface of the ejector, and the die chip 29 is projected upward with respect to the upper surface of the ejector 31, part of the sheet metal P is chipped into the chip hole 33. It is configured so as to flow between the inner surface of the recess and the inner surface of the recess 49. Therefore, in a state where the sheet metal P is sandwiched between the punch body 51 and the ejector 31 by the urging force of the coil spring 47, the closed state is defined by one surface Pa of the sheet metal P, the inner surface of the tip hole 33, and the inner surface of the recess 49. Part of the sheet metal P will flow into the (closed) cavity.

In particular, since the coil spring 47 is provided on the lower side of the die body 19, it is possible to increase the biasing force of the coil spring 47 and firmly secure the closed state of the cavity.

Further, as described above, the ejector 31 (the lower surface of the ejector 31) is configured to abut against the upper surface of the die body 19 when the die chip 29 is projected upward with respect to the upper surface of the ejector 31. A spherical or arcuate convex portion 63 is formed so as to project downward at a portion of the step portion 61 of the punch body 51 which vertically opposes the die chip 29. Therefore, when the protrusion N is formed on the predetermined portion of the one surface Pa of the sheet metal P, the opposite side of the predetermined portion of the other surface Pb of the sheet metal P can be pressed from above with a sufficient pressing force.

As described above, according to the first embodiment of the present invention, as described above, a part of the sheet metal P is closed while the sheet metal P is sandwiched between the punch body 51 and the ejector 31 by the urging force of the coil spring 47. It will flow into the cavity of the state. Therefore, according to the first embodiment of the present invention, a part of the sheet metal P is sufficiently filled in the closed cavity, and a protrusion is stably formed on one surface Pa of the sheet metal P using the die die 3 or the like. Can be formed.

Further, according to the first embodiment of the present invention, as described above, when the projection N is formed on the predetermined portion of the one surface Pa of the sheet metal P, the side opposite to the predetermined portion of the other surface Pb of the sheet metal P is formed. Can be pressed from above with a sufficient pressing force. Therefore, according to the first embodiment of the present invention, it is possible to suppress the floating of the other surface Pb of the sheet metal P on the side opposite to the predetermined portion, and to maintain the appearance of the sheet metal product.

Further, according to the first embodiment of the present invention, as described above, the flatness can be maintained in the portion of the one surface Pa of the sheet metal P on the end surface Pe side of the predetermined portion. In other words, the flatness can be maintained in the portion of the one surface Pa of the sheet metal P closer to the end surface Pe than the protrusion N. Therefore, according to the first embodiment of the present invention, after the relative positioning of the second sheet metal W, the longitudinal direction is provided at the boundary between the end surface Pe of the sheet metal P and a part of the end surface We of the second sheet metal W. It is possible to stably perform welding such as laser welding along the line.

(Second Embodiment of the Invention)
As shown in FIG. 6, in the protrusion forming mold set 65 according to the second embodiment of the present invention, a protrusion N for performing relative positioning of the second sheet metal W is provided on one surface of the sheet metal P. It is used when forming and includes a punch die 67 and a die die 69 for forming protrusions. Further, the punch die 67 for forming the protrusion is detachably attached to the attachment hole 17 of the upper turret 15 as the upper attachment base in the punch press, similarly to the punch die 5 for forming the protrusion. There is. The protrusion forming die die 69 is detachably attached to the attaching hole 11 of the die die holder 9 attached to the lower turret 7 as the lower attaching base in the punch press, similarly to the protruding die die 3. It is supposed to be done.

Next, the details of the configuration of the punch die 67 for forming a protrusion according to the second embodiment of the present invention will be described.

As shown in FIGS. 6 and 7, the punch die 67 for forming a projection includes a cylindrical punch guide 71, and the punch guide 71 can move up and down in the mounting hole 17 of the upper turret 15 (vertical direction). (Movable to) and removable. The punch guide 71 is supported by a plurality of lifter springs (not shown) attached to the periphery of the mounting hole 17 of the upper turret 15.

The punch guide 71 is configured to be non-rotatable around the axis C (axis of the punch die 67) with respect to the mounting hole 17 of the upper turret 15 by the engaging action of the key 73 and the key groove (oblong hole) 75. Has been done. The key 73 is provided at an appropriate position on the peripheral edge of the mounting hole 17 of the upper turret 15, and the key groove 75 is formed at an appropriate position on the outer peripheral surface of the punch guide 71 so as to extend in the vertical direction. The key 73 may be provided at an appropriate position on the outer peripheral surface of the punch guide 71, and the key groove 75 may be formed on the outer peripheral surface of the die body 19 so as to extend in the vertical direction.

The punch guide 71 has a disk-shaped punch plate 77 on the lower end side thereof, and the punch plate 77 can be attached to and detached from the lower end side of the punch guide 71 via a plurality of mounting bolts (not shown). It has become. The lower surface of the punch plate 77 corresponds to the lower surface of the punch guide 71, and the upper surface of the punch plate 77 corresponds to the bottom surface of the punch guide 71. Further, a chip hole 79 is formed at the center of the punch plate 77 so as to penetrate therethrough. The punch plate 77 may be integrally provided on the lower end side of the punch guide 71.

The punch guide 71 includes a punch body 81 that can be raised and lowered inside the punch guide 71, and the punch body 81 has a male screw portion 83 on the upper end side thereof. Further, the punch body 81 is configured to be non-rotatable around the axis C with respect to the punch guide 71 by the engaging action of the key 85 and the key groove 87. The key 85 is provided at an appropriate position on the outer peripheral surface of the punch body 81, and the key groove 87 is formed so as to extend in the vertical direction at an appropriate position on the outer peripheral surface of the punch guide 71. The keys 85 may be provided at appropriate positions on the punch guide 71, and the key grooves 87 may be formed at appropriate positions on the outer peripheral surface of the punch body 81.

The punch body 81 is integrally provided with a cylindrical punch tip 89 at the center of its lower surface, and the punch tip 89 can be inserted into the tip hole 79. The punch tip 89 may be detachably attached to the punch body 81. The characteristic part of the punch tip 89 will be described later.

The punch body 81 is provided with an annular punch head 91 screwed on the upper end portion (male screw portion 83) thereof, and the punch head 91 has a female screw portion 93 screwed on the male screw portion 83 inside thereof. doing. The punch head 91 is pressed (pressed) from above by a striker 59 in a punch press.

As shown in FIGS. 6 and 7, the punch body 81 has an annular spring seat 95 on the outer peripheral surface side above the punch guide 71. Further, the punch head 91 and the spring seat 95 are provided with a stripper spring 97 for urging the punch body 81 downward, and the stripper spring 97 surrounds the punch body 81.

As shown in FIGS. 7 and 8A and 8B, when the punch body 81 descends with respect to the punch guide 71 while resisting the urging force of the stripper spring 97, the punch tip 89 is placed on the lower surface of the punch plate 77. On the other hand, it is configured to project downward. Further, the punch body 81 (the lower surface of the punch body 81) is configured to abut against the upper surface of the punch plate 77 when the punch chip 89 is projected downward with respect to the lower surface of the punch plate 77.

A concave portion 99 having a shape corresponding to the protrusion N is formed at the tip portion (lower end portion) of the punch tip 89. Then, in the punch die 67, when the punch chip 89 is projected downward with respect to the lower surface of the punch plate 77 in a state where the lower surface of the punch plate 77 is pressed against the end portion side of the one surface Pa of the sheet metal P, A part of the sheet metal P is configured to flow between the inner surface of the chip hole 79 and the inner surface of the recess 99.

Subsequently, the configuration of the die die 69 for forming the protrusion according to the second embodiment of the present invention will be briefly described.

The die die 69 is configured to be non-rotatable around the axis C (axis of the die die 69) C with respect to the mounting hole 11 of the die die holder 9 by the engaging action of the key 101 and the key groove 103. ing. The key 101 is provided at an appropriate position on the outer peripheral surface of the die mold 69, and the key groove 103 is formed on the periphery of the mounting hole 11 of the die mold holder 9 so as to extend in the vertical direction. The die die 69 may be configured to be rotatable around the axis C with respect to the mounting hole 11 of the die die holder 9 by omitting the key 101 and the key groove 103.

A spherical convex portion (pressing portion) 105 that presses the sheet metal P from below is formed at a location on the upper surface of the die die 69 that vertically opposes the punch chip 89 so as to project upward. The convex portion 105 may be formed in an arc shape instead of the spherical shape.

Subsequently, the operation and effect of the second embodiment of the present invention will be described.

With one surface Pa of the sheet metal P facing upward, the sheet metal P is moved in the horizontal direction relative to the punch die 67 and the like. Accordingly, the sheet metal P can be positioned so that a predetermined portion (a predetermined portion on the end side) of the one surface Pa of the sheet metal P is located below the punch chip 89.

After the sheet metal P is positioned, the striker 59 presses the punch head 91 from above to lower the punch body 81. Then, the punch guide 71 is integrally lowered with the punch body 81 while resisting the biasing force of the plurality of lifter springs, and the lower surface of the punch guide 71 is pressed against one surface of the sheet metal P. Further, with the lower surface of the punch guide 71 pressed against one surface of the sheet metal P, the punch body 81 is moved down against the punch guide 71 against the biasing force of the stripper spring 97, and the punch tip 89 is punched. The lower surface of 71 is projected downward. Then, the punch body 81 abuts against the upper surface of the punch plate 77, and a part of the sheet metal P flows between the inner surface of the chip hole 79 and the inner surface of the recess 99.

Accordingly, the protrusion N can be formed on a predetermined portion of the one surface Pa of the sheet metal P while maintaining the flatness of the portion of the one surface Pa of the sheet metal P closer to the end surface Pe than the predetermined portion.

In short, as described above, the punch tip 89 projects downward from the lower surface of the punch plate 77 when the punch body 81 descends with respect to the punch guide 71 while resisting the biasing force of the stripper spring 97. It is configured. Further, in the punch die 67, when the punch chip 89 is projected downward with respect to the lower surface of the punch plate 77 in a state where the lower surface of the punch plate 77 is pressed against the end portion side of the one surface Pa of the sheet metal P, A part of the sheet metal P is configured to flow between the inner surface of the chip hole 79 and the inner surface of the recess 99. Therefore, in a state where the sheet metal P is sandwiched between the punch plate 77 and the die die 69 by the biasing force of the stripper spring 97, the sheet metal P is partitioned by the one surface Pa of the sheet metal P, the inner surface of the chip hole 79 and the inner surface of the recess 99. A part of the sheet metal P flows into the closed (closed) cavity.

Further, as described above, the punch body 81 is configured to abut against the upper surface of the punch plate 77 when the punch tip 89 is projected downward with respect to the lower surface of the punch plate 77. A spherical or arcuate convex portion 105 is formed so as to project upward at a position on the upper surface of the die die 69 that vertically opposes the punch tip 89. Therefore, when the protrusion N is formed on the predetermined portion of the one surface Pa of the sheet metal P, the opposite side of the other portion of the other surface Pb of the sheet metal P can be pressed from below with a sufficient pressing force.

Therefore, according to the second embodiment of the present invention, as described above, a part of the sheet metal P is closed while the sheet metal P is sandwiched between the punch plate 77 and the die die 69 by the urging force of the stripper spring 97. It will flow into the cavity of the state. Therefore, according to the second embodiment of the present invention, a part of the sheet metal P is sufficiently filled in the cavity, and the protrusion is stably formed on one surface Pa of the sheet metal P using the punch die 67 or the like. be able to.

Further, according to the second embodiment of the present invention, as described above, when the protrusion N is formed on the predetermined portion of the one surface Pa of the sheet metal P, the side opposite to the predetermined portion of the other surface Pb of the sheet metal P is formed. Can be pressed from below with a sufficient pressing force. Therefore, according to the second embodiment of the present invention, the appearance of the sheet metal product can be maintained by suppressing the depression on the other surface Pb of the sheet metal P on the side opposite to the predetermined portion.

The present invention is not limited to the above description of the embodiment, but can be implemented in various modes. The scope of rights included in the present invention is not limited to the above embodiment.

1 Mold set for forming protrusions 3 Die mold for forming protrusions 5 Punch mold for forming protrusions 7 Lower turret 9 Die mold holder 11 Mounting hole 13 Through hole 15 Upper turret 17 Mounting hole 29 Die chip 31 Ejector 33 Chip Hole 35 Connection bolt 37 Slide pin 39 Mounting bolt 41 Spring seat 43 Spacer 45 Support ring 47 Coil spring 49 Recess 51 Punch body 57 Punch head 59 Stryker 61 Step 63 Protrusion 65 Mold set 67 for protrusion formation For protrusion formation Punch die 69 Die die for forming protrusion 71 Punch guide 77 Punch plate 79 Chip hole 81 Punch body 89 Punch tip 91 Punch head 95 Spring seat 97 Stripper spring 99 Recess 105 Convex part P Sheet metal (first sheet metal)
W 2nd sheet metal N protrusion Ns abutting part

Claims (9)

A die mold used for forming a projection for relative positioning of a second sheet metal on one surface of the sheet metal,
With a die body,
A die chip provided on the upper surface of the die body,
An ejector provided on the upper side of the die body so as to be able to move up and down, and having a chip hole for inserting the die chip,
A biasing member that biases the ejector upward,
The die chip is configured to project upward with respect to the upper surface of the ejector when the ejector descends while resisting the urging force of the urging member,
A recess having a shape corresponding to the protrusion is formed at the tip of the die chip,
When one surface of the sheet metal is pressed against the upper surface of the ejector and the die chip is projected upward with respect to the upper surface of the ejector, a part of the sheet metal is formed between the inner surface of the chip hole and the inner surface of the recess. A die mold for forming protrusions, which is configured to flow in between. The die mold for forming a protrusion according to claim 1, wherein the ejector is configured to abut against an upper surface of the die body when the die chip is projected upward with respect to an upper surface of the ejector. The die die for forming a protrusion according to claim 1, wherein the biasing member is provided below the die body. A mold set used for forming a protrusion for performing relative positioning of a second sheet metal on one surface of the sheet metal, comprising:
A die die for forming a protrusion according to any one of claims 1 to 3,
A projection forming die set comprising a punch body for pressing a sheet metal from above and a punch head provided at an upper end portion of the punch body, and a projection forming die set. .. 5. The mold set for forming a protrusion according to claim 4, wherein a spherical or arc-shaped convex portion is formed at a position on the lower surface of the punch body that vertically opposes the die chip. A punch die used for forming a projection for relative positioning of a second sheet metal on one surface of the sheet metal, comprising:
A cylindrical punch guide with chip holes formed on the lower surface,
A punch body that is provided so as to be able to move up and down inside the punch guide and that is not rotatable about an axis with respect to the punch guide,
A punch chip provided on the lower surface of the punch body and insertable into the chip hole,
A punch head provided at the upper end of the punch body,
A biasing member that biases the punch body upward,
The punch tip is configured to project downward with respect to the lower surface of the punch guide when the punch body descends with respect to the punch guide while resisting the urging force of the urging member.
A recess having a shape corresponding to the protrusion is formed at the tip of the punch tip,
When the punch tip is projected downward with respect to the lower surface of the punch guide in a state in which the lower surface of the punch guide is pressed against one surface of the sheet metal, a part of the sheet metal is separated from the inner surface of the chip hole and the concave portion. A punch die for forming a projection, characterized in that it is configured so as to flow into an inner surface. The punch die for forming a projection according to claim 6, wherein the punch body is configured to abut against a bottom surface of the punch guide when the punch tip is projected downward with respect to a lower surface of the punch guide. .. A mold set used for forming a protrusion for performing relative positioning of a second sheet metal on one surface of the sheet metal, comprising:
A punch die for forming a protrusion according to claim 6 or 7,
A die set for forming a projection, comprising: a die die for forming a projection. The mold set for forming a protrusion according to claim 8, wherein a spherical or arc-shaped convex portion is formed at a position on the upper surface of the die mold that vertically opposes the punch chip.

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