JP3645326B2 - Extraction tool for press-fitting bush - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an extraction tool for extracting a press-fitting bush of a press die from a press-fitting side.
[0002]
[Prior art]
There is known a press die having a press-fitting bush provided with a through-hole and press-fitted into a mounting hole of a predetermined holding member, for example, a punching bush in which one opening peripheral portion of the through-hole has a cutting edge. . A press lower die 10 shown in FIG. 7 is an example of such a press die, and is integrally formed with a pair of upper and lower bases 12 and 14 integrally fixed to the upper surface of the upper base 14 with bolts or the like. The retainer 16 is fixedly provided, and a plurality of (three in this example) punching bushes 18 disposed on the retainer 16. The punching bush 18 corresponds to a press-fitting bush, and is press-fitted and fixed in a mounting hole 20 provided in the retainer 16 as shown in FIG. 8, and the punching bush 18 is used for punching (piercing). A through hole 22 is provided, and an opening peripheral edge on the upper side of the through hole 22 is a cutting edge 24 for punching holes. The lower press mold 10 is disposed on a bolster of a press machine (not shown), and punching is performed by the punch of the upper press mold and the punching bush 18. The shape of the cutting edge 24, that is, the shape of the upper end opening of the through hole 22 is appropriately determined according to the target punch hole shape, and the outer peripheral shape of the punching bush 18, that is, the shape of the mounting hole 20, is In consideration of the shape of the through hole 22, it is determined as an appropriate shape such as a circle, an ellipse, or an oval.
[0003]
Here, according to the lower press mold 10 as described above, the punching bush 18 can be extracted from the retainer 16 when performing mold correction or mold repair by changing the punched hole shape or the like. It is possible to change, and the operation can be easily and quickly performed as compared with the case of directly engraving the base 14. Also, when performing mold exchange, it is advantageous in terms of cost.
[0004]
The lower press mold 10 performs punching, that is, piercing. However, even when blanking is performed in which the extracted portion becomes a product, if the target product is relatively small, it is used for punching. It can be similarly configured using a bush. In the above example, the retainer 16 disposed at a fixed position is a holding member, but it is also possible to perform a punching process by press-fitting and fixing a punching bushing to a biasing die for performing a bending process. In this case, the gathering die becomes the holding member. In addition, the through hole 22 of the punching bush 18 is provided with a step portion 26 in the middle, and the lower portion, that is, the opposite side to the cutting edge 24 is a large diameter portion 22a, so that scrap can be easily discharged. However, like the punching bush 30 shown in FIG. 9, it is of course possible to provide a through hole 28 having a tapered portion 28a whose diameter dimension gradually increases as it goes downward. Alternatively, it may be a simple cylindrical through hole having no taper portion.
[0005]
[Problems to be solved by the invention]
However, in such a conventional press mold, when the press-fitting bushing is extracted from the holding member, the holding member needs to be removed from the press mold one by one because it has been knocked out from the back side of the holding member with a hammer or the like. The work was cumbersome and time consuming. For example, the removal work of the holding member such as the retainer may involve a large and dangerous work that must be lifted by a crane or the like in some cases, so that the burden on the operator is great and the removal work takes a long time.
[0006]
The present invention has been made against the background described above, and an object of the present invention is to provide an extraction tool that can easily extract the press-fitting bush of a press die from the press-fitting side.
[0007]
[Means for Solving the Problems]
In order to achieve such an object, the first invention provides a press mold having a press-fit bush provided with a through-hole and press-fitted into a mounting hole of a predetermined holding member, for extracting the press-fit bush from the press-fit side. A tool body having (a) a tool body having an insertion portion inserted into the through hole from the press-fitting side opening of the through hole, and (b) disposed in the insertion portion of the tool body. In the retracted position that allows the insertion portion to be inserted into the through hole, and in a state where the insertion portion is inserted into the through hole , the insertion portion cannot be pulled out into the press-fitting bush by being protruded from the insertion portion. A latch member that is moved to a locking position to be locked, and (c) is disposed on the tool body and mechanically connected to the latch member, and the insertion portion is disposed in the through hole. Latch driving means for selectively moving the latch member mechanically to the retracted position and the locking position in accordance with the operation of the operating portion positioned outside the through hole in the inserted state. It is characterized by.
[0008]
The second invention is an extraction tool for extracting the press-in bushing from the press-in side in a press die having a press-in bush provided with a through-hole and press-fitted into a mounting hole of a predetermined holding member. ) A latch that has an insertion portion that is inserted into the through-hole from the press-fitting side opening of the through-hole, and that is inserted into the through-hole so that it cannot be pulled out into the press-fit bush. parts and a tool body provided integrally with the insertion portion, (b) rotatably in shaft center around which the insertion portion is the through-hole and flat row in the inserted state in the through hole, disposed in the locking portion and the same position of the insertion portion, by being rotated on its shaft center around a retracted position for allowing that the insertion portion is inserted into the through hole , Said locking A latch member that is positioned at a locking position that protrudes to the opposite side of the press-fitting bush and cannot be extracted by the press-fitting bush, and (c) the tool is concentric with the uniaxial center and rotatable about the central axis. A connecting rod which is disposed in the main body and is connected to the latch member so as not to be relatively rotatable about its uniaxial center, and the insertion portion of the connecting rod is inserted into the through hole When the operation portion provided integrally with the portion located outside the through hole is rotated around its one axis, the latch member is selectively moved to the retracted position and the locking position. And a latch driving member.
[0009]
【The invention's effect】
In the extraction tool according to the first aspect of the invention, the latch member is moved to the retracted position, whereby the insertion portion of the tool body is allowed to be inserted into the through hole of the press-fitting bush from the press-fitting side, and the insertion portion is inserted into the through hole. When the latch member is moved to the locking position by the latch driving means in this state, the latch member protrudes from the insertion portion and is locked to the press-fit bush so that it cannot be extracted. Then, if the tool body is pulled manually or by a machine so as to extract the insertion portion from the through hole in this state, the press-fitting bush is pulled together and extracted from the mounting hole of the holding member. That is, since the press-fitting bush can be extracted from the press-fitting side, there is no need to remove the holding member from the press die one by one, and thereby the press-fitting bush can be easily and quickly extracted.
[0010]
The second invention corresponds to an embodiment of the first invention, and the same effect as the first invention can be obtained. In addition, according to the second aspect of the present invention, since the locking portion is integrally provided in the insertion portion of the tool body, at least one latch member may be provided, and the latch member is arranged around one axis by the latch driving member. By being rotated, it can be selectively moved to the locking position and the retracted position, so that the structure is simple and the insertion part can be made compact in particular, and the press-in bushing extraction tool with a small through hole It can be applied well to.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Here, the extraction tool of the present invention is suitably used when extracting a bush for punching such as hole punching from the press-fitting side, that is, the cutting edge side, but is also used for extracting another press-fitting bush having a through hole. be able to.
[0012]
The latch member in the first invention may be one when the locking portion is provided integrally with the insertion portion as in the second invention, but when such a locking portion is not provided, the latch member may be It is desirable to dispose a plurality and lock them at a plurality of locations around the through hole. The latch member is locked to the press-fitting bush so as not to be pulled out by being moved to the locking position. For example, a step portion (such as the step portion 26 in FIG. 8) provided in the through hole or a tapered portion (FIG. 9). 28a), or the other edge of the through hole, that is, the peripheral edge of the opening opposite to the press-fitting side. The latch member may be one that is rotated around a uniaxial center that is substantially parallel to the through-hole as in the second aspect of the invention, but one that is slid in a direction perpendicular to the uniaxial center, Various modes that can move to the retracted position and the locking position, such as those that are swung around an axis perpendicular to the angle, can be employed.
[0013]
The latch driving means selectively moves the latch member to the retracted position and the locking position in accordance with the operation of the operation portion, and is appropriately set according to the movement mode of the latch member. The member is an example. When the latch member is slidably moved in a direction perpendicular to the uniaxial center, or is oscillated around an axis perpendicular to the uniaxial center, for example, the uniaxial center is substantially the same as the uniaxial center. A connecting rod arranged to be movable in a parallel direction is connected to a latch member via a cam mechanism or a link mechanism, and is latched via a cam mechanism or a link mechanism when the connecting rod is moved in a uniaxial direction. The member can be slid in a direction perpendicular to the uniaxial center, or can be swung around an axis perpendicular to the uniaxial center.
[0014]
In addition, a moderation mechanism that holds the latch member in the locking position with the elastic force of a spring or the like, or a latch drive so that the press-in bushing can be easily pulled out while the latch member is in the locking position. It is also possible to provide locking position holding means such as a positioning mechanism for positioning the operation portion of the means at a position corresponding to the locking position. It is also possible to provide an elastic member such as a spring that constantly urges the latch member to move to the locking position as the locking position holding means. In this case, for example, when the latch member is slid in a direction perpendicular to the uniaxial center, or is oscillated around an axis perpendicular to the uniaxial center, the insertion portion is When the latch member is engaged with the through hole when inserted into the through hole, the latch member can be moved to the retracted position side against the biasing force of the elastic member by a cam action or the like. is there. An elastic member such as a spring that constantly urges the latch member to move to the retracted position is provided, and the latch member is moved to the locking position against the urging force of the elastic member according to the operation of the operation unit. Thus, the latch member can be held at the locking position by the locking position holding means such as the moderation mechanism or the positioning mechanism.
[0015]
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following embodiments, a case where the punching bush 18 shown in FIG. 8 is extracted will be described.
[0016]
FIG. 1 is a front view showing an extraction tool 40 according to an embodiment of the invention described in claim 2, and FIGS. 2 and 3 are views showing a II-II section and a III-III section in FIG. 1, respectively. . The extraction tool 40 includes a first main body member 42 and a second main body member 44 that constitute a tool main body, and the first main body member 42 includes a bottomed cylindrical portion 46 that has a female screw on the inner side thereof, and an existence thereof. And a bolt 48 erected on the bottom of the bottom cylindrical portion 46 so as to protrude in the opposite direction. The bolt 48 is for attaching an existing knocking jig for pulling out the knock pin, and in this embodiment, the knocking jig 18 can be attached as needed to remove the punching bush 18. It is also possible to provide a jig similar to the knocking jig integrally with the first main body member 42 in advance.
[0017]
The second main body member 44 has a cylindrical insertion portion 50 that has a smaller diameter than the through hole 22 of the punching bush 18 and can be inserted into the through hole 22 from the cutting blade 24 side, that is, the press-fitting side, and the insertion thereof. A male threaded portion 52 projecting in the opposite direction to the portion 50, and the male threaded portion 52 is screwed into the bottomed cylindrical portion 46 of the first main body member 42 so as to be integrated with the first main body member 42. Combined. A shallow concave portion 54 is provided at an intermediate position in the axial direction of the insertion portion 50 by cutting out a part of the outer peripheral surface thereof, that is, a portion on the left side in FIGS. The step portion 56 between the front end side portion and the front end portion is engaged with the step portion 26 of the through hole 22 so as to function as a locking portion that is locked to the punching bush 18 so as not to be extracted. It has become. The dimension in the axial direction of the recess 54, that is, the vertical dimension in FIG. 1 is longer than the length dimension of the small diameter portion of the through hole 22.
[0018]
A concave portion 58 deeper than the radial dimension of the insertion portion 50 is formed in a portion of the insertion portion 50 on the tip side of the concave portion 54 and on the side opposite to the concave portion 54 around the axis. A latch member 60 having substantially the same shape as the space in 58, that is, a substantially semi-cylindrical shape, is disposed in the recess 58 so as not to move in the axial direction (vertical direction in FIG. 1) and to move in a direction perpendicular to the axis. ing. The latch member 60 is fixed to a connecting rod 62 disposed in parallel with the shaft center at a position eccentric from the shaft center of the insertion portion 50 by a set screw 64 so that the latch member 60 cannot rotate relative to the shaft. It is configured to rotate integrally with the connecting rod 62 around the axis, that is, around the uniaxial center that is substantially parallel to the through hole 22 when inserted into the through hole 22.
[0019]
The lower left side portion of the latch member 60 in FIG. 3 is rounded into an arcuate shape having an angle range of about 90 ° centered on the uniaxial center and about 90 ° around the uniaxial center. Is allowed to rotate within the angular range of FIG. 3 and is completely accommodated in the recess 58 as shown by a solid line in FIG. 3 to allow the insertion portion 50 to be inserted into the through hole 22. As shown by the alternate long and short dash line in FIG. 3, the retracted position protrudes to the opposite side of the stepped portion 56 and engages with the stepped portion 26 of the through hole 22 so as to be locked to the punching bush 18 so as not to be extracted. It is made to be located in the locking position. Further, the upper end surface of the latch member 60, that is, the side wall surface on the upper side of the concave portion 58, is in the substantially same position as the stepped portion 56 in the axial direction, and the axial center of the insertion portion 50 is substantially the same as the axial center of the through hole 22. The upper end surface of the latch member 60 and the stepped portion 56 are both engaged with the stepped portion 26 of the through hole 22 in a parallel posture. Note that the latching position of the latch member 60 is not necessarily limited to the position rotated by approximately 90 ° as shown by the one-dot chain line in FIG. Corresponds to position. The retracted position is not limited as long as the insertion part 50 can be inserted into the through hole 22 and may protrude slightly from the recess 58.
[0020]
The length of the connecting rod 62 is longer than the length of the second main body member 44, and is penetrated through a through hole 66 formed through the second main body member 44 in the axial direction, and provided at the upper end. The male screw portion is disposed so as to be rotatable about the axis in a state where the male screw portion protrudes from the through hole 66. The connecting rod 62 is inserted into the through hole 66 of the second main body member 44 with the latch member 60 disposed in the recess 58, the male screw portion at the upper end protrudes upward, and the lower end is the tip of the insertion portion 50. Is fixed to the latch member 60 integrally by the set screw 64 at a position that substantially coincides with the second main body member 44 so as not to fall off.
[0021]
A connecting member 68 is screwed and integrally coupled to the male screw portion at the upper end of the connecting rod 62, and the operating lever 70 is connected to the connecting member 68 from one axis, that is, a direction perpendicular to the axis of the connecting rod 62. Are screwed together to be integrally coupled. The bottomed cylindrical portion 46 of the first main body member 42 is provided with a notch groove 72 over an angular range of approximately 90 ° in the circumferential direction, and the operation lever 70 protrudes outward from the notch groove 72. In addition, the latch member 60 can be selectively rotated to the retracted position and the locked position via the connecting rod 62 by being rotated in an angle range of approximately 90 °. The connecting member 68 is screwed to the connecting rod 62 before the first main body member 42 is screwed to the second main body member 44, and the operation lever 70 is screwed to the first main body member 42 to the second main body member 44. It is screwed to the connecting member 68. In the present embodiment, the latch drive member, that is, the latch drive means in claim 1 is configured including the connecting rod 62 and the operation lever 70, and the operation lever 70 corresponds to the operation portion. 2 corresponds to the latch member 60 indicated by the solid line and the alternate long and short dash line in FIG. 3, respectively.
[0022]
In the case of extracting the punching bush 18 shown in FIG. 8 using the extraction tool 40 configured as described above, first, the latch member 60 is held in the retracted position as shown by the solid line in FIGS. Then, the insertion portion 50 is inserted into the through hole 22 of the punching bush 18 from the distal end side thereof, and the step portion 56 is positioned below the step portion 26 as shown in FIG. Both sides are brought into contact with the through hole 22. In this state, the operation lever 70 is rotated, and the latch member 60 is rotated to the locking position as shown in FIG. Thereby, both the step portion 56 and the latch member 60 can be engaged with the step portion 26, and if the extraction tool 40 is pulled upward in FIG. Are pulled upward together and extracted from the mounting hole 20 of the retainer 16. 4A and 5A are longitudinal sectional views and FIG. 5B is a plan view.
[0023]
As described above, according to the extraction tool 40 of the present embodiment, the punching bush 18 can be extracted from the cutting blade 24 side, that is, the press-fitting side. Therefore, it is not necessary to remove the retainer 16 from the base 14 one by one. The extraction operation of the bush 18 can be performed easily and quickly. The removal work of the retainer 16 may involve a large-scale and dangerous work that must be lifted by a crane or the like in some cases. If possible, the burden on the operator can be greatly reduced and the working time can be shortened.
[0024]
Further, in the extraction tool 40 of the present embodiment, the insertion portion 50 is provided with a recess 54, and the lower step portion 56 is locked to the step portion 26 of the punching bush 18 as a locking portion. Therefore, only one latch member 60 may be used, and the latch member 60 is disposed in the recess 58 and rotated around the axis thereof together with the connecting rod 62 to select the retracted position and the locked position. Therefore, the insertion portion 50 can be configured in a compact manner, and the through hole 22, that is, the punching bush 18 having a small punching shape can also be formed. The sampling operation can be performed satisfactorily.
[0025]
Next, another embodiment of the present invention will be described. In the following embodiments, portions that are substantially common to the above embodiments are denoted by the same reference numerals, and detailed description thereof is omitted.
[0026]
The extraction tool 80 shown in FIG. 6 has an integrally configured tool body 82, and the tool body 82 is provided with the bolt 48, the recessed portion 54, and the notch groove 72, and a grip provided with a non-slip knurl. A portion 84 is provided. The latch member 60 is disposed at the distal end portion of the insertion portion 50 and fixed to the connecting rod 62 with a screw, and the operation lever 70 is fixed to the upper end portion of the connecting rod 62 with a screw directly. In this case, the connecting rod 62 to which the latch member 60 is fixed in advance is inserted into the through hole 66 from the distal end side of the insertion portion 50, and the operation lever 70 is fixed to the upper end thereof. Further, the reaction force acting on the latch member 60 when extracting the punching bush 18 is transmitted from the connecting rod 62 to the tool body 82 via the operation lever 70.
[0027]
As mentioned above, although one Example of this invention was described in detail based on drawing, this invention can also be implemented in another aspect.
[0028]
For example, although the insertion portion 50 has a cylindrical shape in the above-described embodiment, the cross-sectional shape thereof is appropriately set, such as an oval shape, an oval shape, or a prismatic shape.
[0029]
Further, in the above-described embodiment, the recess 54 is provided by being cut out in a planar shape. However, the notch shape of the recess 54 is such that the recess 54 is provided by cutting it into a cylindrical surface having a smaller curvature than the insertion portion 50. Set as appropriate. Of course, it is possible to form the locking portion of claim 2 by providing the protrusion without providing the recess.
[0030]
In the embodiment, the latch member 60, the connecting rod 62, the connecting member 68, and the operation lever 70 are all fixed integrally by screw connection. However, the latch member 60, the connecting rod 62, the connecting member 68, and the operation lever 70 are integrally fixed by other fixing means such as welding. It may be fixed.
[0031]
Although not exemplified one by one, the present invention can be carried out in various modifications and improvements based on the knowledge of those skilled in the art.
[Brief description of the drawings]
FIG. 1 is a front view of a sampling tool according to an embodiment of the present invention.
FIG. 2 is a view showing a II-II cross section in FIG. 1;
3 is a view showing a cross section taken along line III-III in FIG.
4 is a view showing a state where an insertion portion of the extraction tool of FIG. 1 is inserted into a through hole of a punching bush.
5 is a view showing a state in which the latch member is rotated to the locking position in the state shown in FIG. 4;
FIG. 6 is a front view showing another embodiment of the present invention.
FIG. 7 is a perspective view showing an example of a press die having a punching bush.
FIG. 8 is a cross-sectional view of a retainer in which a punching bush is press-fitted and fixed in FIG.
FIG. 9 is a view showing another example of a punching bush and corresponds to FIG.
[Explanation of symbols]
10: Lower press mold (press mold)
16: Retainer (holding member)
18, 30: Bushing for punching (press-fit bush)
22, 28: Through hole 40, 80: Extraction tool 42: First body member (tool body)
44: Second body member (tool body)
50: Insertion part 56: Step part (locking part)
60: Latch member 62: Connecting rod (latch drive member, latch drive means)
70: Operation lever (latch drive member, latch drive means)
82: Tool body

Claims (2)

In a press die having a press-fitting bush provided with a through-hole and press-fitted into a mounting hole of a predetermined holding member, an extraction tool for extracting the press-fitting bush from the press-fitting side,
A tool body having an insertion portion inserted into the through hole from the press-fitting side opening of the through hole;
Together is disposed in the insertion portion of the tool body, a retracted position the insert to allow it to be inserted into the through hole, in a state in which the insert is inserted into the through hole, the insertion portion A latch member which is moved to a locking position where it is locked to the press-fit bush so as not to be pulled out by being protruded from
In accordance with the operation of the operation portion that is disposed on the tool body and mechanically connected to the latch member, and that is positioned outside the through hole in a state where the insertion portion is inserted into the through hole, And a latch driving means for selectively moving the latch member to the retracted position and the locking position mechanically. In a press die having a press-fitting bush provided with a through-hole and press-fitted into a mounting hole of a predetermined holding member, an extraction tool for extracting the press-fitting bush from the press-fitting side,
A locking portion that has an insertion portion that is inserted into the through hole from the press-fitting side opening of the through hole, and that is locked to the press-fit bush so that it cannot be pulled out when the insertion portion is inserted into the through hole. A tool body provided integrally with the insertion portion;
Rotatably in shaft center around which the insertion portion is the through hole and the flat row and in a state of being inserted in the through hole, disposed in the locking portion and the same position of the insertion portion, By being rotated around the one axis, a retracted position allowing the insertion portion to be inserted into the through-hole, and protruding to the opposite side of the locking portion so that it cannot be extracted from the press-fitting bush. A latch member positioned at a locking position to be stopped;
A connecting rod which is disposed in the tool body so as to be concentric with the uniaxial center and rotatable about the axial center, and is connected to the latch member so as not to be relatively rotatable about the uniaxial center; By operating the operation part provided integrally with the portion located outside the through hole in the state where the insertion part is inserted into the through hole in the connecting rod, And a latch driving member that selectively moves the latch member to the retracted position and the locking position.

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