JP6404022B2 - Undercut processing mechanism - Google Patents

Description

  The present invention relates to a receiving side metal that has been placed in the material at the time of the press working after the press working is performed on the material as a press-molded product to dent at least one of both wall surfaces inwardly facing each other. The present invention relates to an undercut processing mechanism that makes it possible to take out a mold. Here, the press working corresponds to, for example, burring.

  Conventionally, for example, a burring apparatus is known as this type of press molding apparatus. That is, it is a processing device that forms a flange at the edge of the hole. This is because a pilot hole is drilled in advance in a metal material to be pressed, and a burring punch having an outer diameter larger than the inner diameter is pushed into the pilot hole to widen the edge of the pilot hole. However, the flange was formed.

  In such a burring apparatus, the work part is distorted or deformed by the pressing force during the drilling operation for making a pilot hole in the work part of the material and the pressing force or lifting force by the burring punch during burring process. In order to prevent these problems, a device has been devised for drilling a pilot hole or burring in a state where a die (receiving die) is placed inside a processed portion of the material.

  However, if the material is not a simple plate-like material, but has a three-dimensional shape having opposite wall surfaces, for example, if it is tubular or bent in the middle, the following problems was there. In other words, when burring is performed on the tubular material so as to face the inside, the die that has been placed inside the material interferes with the workpiece, and the die is removed from the pressed product. There was a problem that could not.

  As a conventional technique capable of solving such a problem, for example, an apparatus using a hydroform described in Patent Document 1 is known. This is because a hydroforming mold incorporates a perforating means for perforating a part of a metal tube, and a split mold having a cylindrical shoulder and a convex outer portion around the perforating means, and an internal pressure is applied to the metal tube. After hydroforming with a load, after drilling a part of the metal tube by the punching means, the periphery of the drilled hole is pushed into the inner surface side of the metal tube by the shoulder and burring is performed on the inner surface side. Device.

  Similarly, as a conventional technique capable of solving the above-described problem, for example, a burring processing apparatus using a nesting and a steel ball described in Patent Document 2 is known. This is arranged so that a jig having an inclined portion is inserted into the inside of the metal tube in which the pilot hole is formed, and the jig and the metal tube are fixed by aligning the inclined portion of the jig with the position of the pilot hole. After that, by pressing a steel ball having a diameter larger than that of the pilot hole against the inclined portion inside the metal tube, the steel ball is pushed out of the metal tube from the position of the pilot hole to perform burring processing.

  However, the conventional technique described in Patent Document 1 described above has a problem that a molding cycle is long and a long time is required for processing. In addition, there is a problem that the punch press-in mechanism including the punching means and the convex shoulder becomes complicated and expensive, resulting in high cost. In addition, special equipment for generating high pressure is required, and the entire apparatus is large and expensive, which is not suitable for general use.

  Further, in the conventional technique described in Patent Document 2 described above, as in Patent Document 1, there is a problem that the molding cycle is long and a long time is required for processing. Moreover, there existed a problem that it was impossible to shape | mold simultaneously in several places. Further, there is a problem that only a burring shape that protrudes outside the metal tube can be formed.

  In view of the problems of the conventional press forming apparatus as described above, the present applicant has already proposed the undercut processing mechanism described in Patent Document 3. This is a concave mold in which both wall surfaces of the material are inwardly facing each other. As a receiving mold to be placed in the material during pressing, it is divided into three in the thickness direction that intersects the direction of advancement and retreat of the material. It was provided with a pair of holding parts that are inserted further and support both wall surfaces from the inside, and an intermediate part that is sandwiched between the holding parts and causes the holding parts to approach or separate from each other in the thickness direction.

JP 2005-297060 A Japanese Patent Laid-Open No. 08-197151 JP 2012-24768 A

  In the conventional technique shown in Patent Document 3 described above, as schematically shown in FIG. 8, a pair of holding portions 1 and 2 and an intermediate portion 3 sandwiched between the holding portions 1 and 2 are provided. I have. 8A, the intermediate part 3 enters between the holding parts 1 and 2 and the holding parts 1 and 2 are separated from each other in the thickness direction. Touch the inside of the wall. Here, the overall thickness of the receiving side mold at the time of press working is L1 in the figure.

  On the other hand, at the time of die cutting shown in FIG. 8 (b), the intermediate part 3 is retracted from between the holding parts 1 and 2, the holding parts 1 and 2 are close to each other in the thickness direction, and the outer surface side is both of the material. Detach from the inside of the wall. At the time of such die cutting, the tips of the holding portions 1 and 2 that are close to each other collide with each other (the oval enclosure in the figure), so that the overall thickness of the receiving side mold is L2 in the figure. I couldn't shorten it.

  More specifically, in the example shown in FIG. 9, at the time of pressing shown in FIG. 9A, the upper and lower holding parts 1A and 2A are separated from each other in the thickness direction with the intermediate part 3A interposed therebetween. The outer surface side excluding the recessed relief portion into which the punch (not shown) is inserted is in contact with the inner side of both wall surfaces of the material 4. Thereby, at the time of a press work, it can prevent that a distortion and a deformation | transformation arise around the to-be-processed part of the raw material 4 (flange of the edge of a hole).

  However, depending on the size of the workpiece 4 (the depth of the flange at the edge of the hole), the material 4 (the flange at the edge of the hole) may be attached to each holding portion 1A, at the time of die cutting shown in FIG. There was a possibility that the die could not be removed due to being caught at the end of the escape portion of 2A. As described with reference to FIG. 8 (b), the thickness of the entire front end side of the receiving mold cannot be further reduced by the collision of the front ends of the holding portions 1A and 2A. Was the cause.

  As an improvement measure for such a problem, for example, a device as shown in FIG. 10 can be considered. In FIG. 10A, the plate thickness on the front end side of each holding portion 1A, 2A is made thin as a whole. In such a case, the flange at the edge of the hole, which is the processed portion of the material 4, easily interferes with the intermediate portion 3A through the relief portions of the holding portions 1A and 2A (the oval enclosure in the figure). Is extremely limited. Therefore, there exists a problem that each holding | maintenance part 1A, 2A cannot play the role as an original die | dye at the time of press work. There is also a problem that the strength on the tip side of each of the holding portions 1A and 2A is significantly reduced.

  Further, in FIG. 10B, only the plate thickness of the front end portion of each holding portion 1A, 2A that comes into contact is reduced. In such a case, a gap is generated between the tip portion of each holding portion 1A, 2A and the intermediate portion 3A (oval enclosure in the figure). Therefore, there is a risk that the front end side of each holding portion 1A, 2A that is not in contact with the intermediate portion 3A cannot withstand the load against the pressing force of the punch at the time of press working. As a result, the material 4 is also deformed, resulting in a new problem that it becomes difficult to perform molding as expected.

  The present invention has been made paying attention to the problems of the conventional techniques as described above. The molding cycle is short, the configuration is simple, and it takes less time and effort to assemble, thereby realizing cost reduction. It can be configured compactly and can meet the demand for space saving, and it can prevent deformation by holding the material firmly at the time of pressing without causing structural strength reduction. In addition, an object of the present invention is to provide an undercut processing mechanism that can easily die-cut a processed part that is undercut in a wide dimensional range during die cutting.

The gist of the present invention for achieving the object described above resides in the inventions of the following items.
[1] After pressing the material (70) as a press-molded product, in which at least one of both wall surfaces is recessed inwardly facing each other, the material is aligned with the material (70) during the pressing. An undercut processing mechanism that enables removal of the receiving mold (20),
The receiving side mold (20) is divided into a plurality of thickness directions intersecting the advancing and retreating direction from the one end opening of the material (70), and enters the material (70) from the one end opening to A pair of holding portions (21, 22) for supporting the wall surface from the inside, and an intermediate portion (30) disposed between the holding portions (21, 22), at least,
The holding portions (21, 22) are recessed inwardly on the outer surface side along the material (70) during the press working, corresponding to the work portions on at least one of both wall surfaces of the material (70). A relief (23) is provided,
The holding portions (21, 22) are spaced apart from each other in the thickness direction, the support surface where the outer surface side excluding the escape portion (23) is in contact with the inside of the both wall surfaces, and the outer surface approaching each other in the thickness direction. Each side is supported movably at the escape position where the sides separate from the inside of both wall surfaces,
The intermediate portion (30) is supported so as to be movable in the forward / backward direction between the holding portions (21, 22). When the intermediate portion (30) enters between the holding portions (21, 22), the holding portions (21, 22) are supported. Is moved to the support position, and when it is withdrawn from between the holding parts (21, 22), the holding parts (21, 22) are moved to the escape position,
Each holding part (21, 22) is provided with unevenness (26) meshing in the thickness direction on the inner surfaces facing each other, and at the supporting position, the convex part (26a) of the unevenness (26) is the intermediate part ( 30), while the concave and convex portions (26) mesh with each other at the escape position, and the combined thickness of the holding portions (21 and 22) matches the convex portions (26a) of the concave and convex portions (26). An undercut processing mechanism characterized by being set smaller.

  [2] The thickness of the holding portions (21, 22) including the convex portion (26a) around the relief portion (23) is the depth of the processed portion recessed inside the pressed product. The thickness of the concave and convex portions (26) meshed with each other and the holding portions (21, 22) is set to be smaller than the dimension between the workpieces on at least one of the wall surfaces. The undercut processing mechanism according to [1].

[3] Both sides of the intermediate portion (30) are tapered to increase the distance between the holding portions (21, 22) as they enter between the holding portions (21, 22).
The underside according to [1] or [2], wherein an inner surface side of each holding portion (21, 22) is inclined in accordance with the inclination of the taper including the unevenness (26). Cut processing mechanism.

[4] Each of the holding portions (21, 22) is supported such that one end side thereof is guided by the support base (40),
The intermediate portion (30) is supported so as to be drivable in the forward / backward direction, and is arranged between the holding portions (21, 22) via the support base (40). , [2] or [3].

  [5] Guide means for guiding the one end side of each holding portion (21, 22) to the support base (40) in a direction crossing the advancing / retreating direction of the intermediate portion (30) and approaching or separating from each other. (42) is provided, The undercut processing mechanism according to the above [4].

  [6] The support base (40) and the drive means (50) of the intermediate part (30) are each mounted on a base (60) and formed as an integral unit. 4] or the undercut processing mechanism according to [5].

The present invention operates as follows.
According to the undercut processing mechanism described in [1] above, when pressing the material (70), the receiving die (20) is positioned in the material (70) in advance, and then the receiving die. The intermediate portion (30) is inserted between the pair of holding portions (21, 22) of (20). At this time, the holding portions (21, 22) are separated from each other in the thickness direction, and the outer surface side (excluding the escape portion (23)) moves to the support position where the both wall surfaces of the material (70) are in contact with each other from the inside. . In such a state, the workpiece to be processed on at least one of both wall surfaces of the material (70) is pressed from the outside, and the workpiece is pressed inward. Here, both wall surfaces of the material (70) may be upper and lower wall surfaces or both wall surfaces.

  At the time of pressing, both wall surfaces of the material (70) are supported from the inside by the respective holding portions (21, 22) within a range that does not hinder the processing including the periphery of the processed portion. Here, the intermediate part (30) is sandwiched between the holding parts (21, 22), and in the receiving side mold (20) in which these are combined, the thickness of the part receiving the load by pressing is reduced. The holding portions (21, 22) and the intermediate portion (30) are overlapped in the vertical direction. Thereby, there is no possibility that the periphery of the processed part will be excessively bent inward and deformed with the press working, and distortion and deformation around the processed part can be prevented.

  After the press working, the holding portions (21, 22) approach each other in the thickness direction by retracting the intermediate portion (30) of the receiving side mold (20) from between the holding portions (21, 22). The outer surface side moves to the escape position where the outer surface side separates from both wall surfaces of the material (70). Each holding portion (21, 22) has an inner surface facing each other at a location where no intermediate portion (30) is interposed therebetween, but each inner surface is provided with an unevenness (26) meshing in the thickness direction. ing. Therefore, the inner surface side of each holding portion (21, 22) comes into contact with the intermediate portion (30) at the convex portion (26a) of the unevenness (26) at the support position, but the unevenness (26 at the escape position). ) Will mesh.

  Thereby, the actual thickness where the holding portions (21, 22) are combined at the escape position can be kept smaller than the thickness when the convex portions (26a) of the concave and convex portions (26) are abutted with each other. . Therefore, it is possible to ensure a large expansion / contraction width for avoiding the processed portion of the press-formed product during die cutting without incurring the structural strength of each holding portion (21, 22). Become. For this reason, the receiving side mold (20) can be easily taken out without being caught by the processed portion in the press-formed product. Note that the expression “the convex portions (26a) of the concave and convex portions (26) abut each other” does not cause the convex portions (26a) to collide with each other in the actual concave and convex portions (26). It is for contrast with dimensions.

  According to the undercut processing mechanism described in [2] above, the thickness of each holding part (21, 22) including the convex part (26a) of the unevenness (26) around the relief part (23). Is larger than the depth of the processed part recessed inside the pressed product. Therefore, there is no possibility that the tip of the processed part interferes with the intermediate part (30) through the relief part (23) in each holding part (21, 22) during press working.

  Further, the thickness when the concave and convex portions (26) of the holding portions (21, 22) are engaged with each other and overlapped is smaller than the dimension between the processed portions on at least one of both wall surfaces of the press-formed product. Therefore, when the receiving mold (20) is taken out during die cutting, the upper and lower ends of each holding part (21, 22) are not caught by the work part in the press-formed product, and can be easily taken out. .

  According to the undercut processing mechanism described in [3], each of the both sides of the intermediate part (30) of the receiving mold (20) enters between the holding parts (21, 22). The taper which expands the distance between holding | maintenance parts (21, 22) is attached. Moreover, the inner surface side of each holding | maintenance part (21, 22) is inclined according to the inclination of a taper including the said unevenness | corrugation (26).

  With such a simple configuration, the intermediate portion (30) is advanced and retracted between the holding portions (21, 22), so that the supporting positions separating the holding portions (21, 22) from each other and the escape positions approaching each other. Can be moved easily. As described above, the inner surface side of each holding portion (21, 22) is in contact with the convex portion (26a) of the concave and convex portions (26) at the support position, but the convex portion (26a). By aligning the height with the inclined surface of the taper, the contact area with the intermediate portion (30) can be increased.

  According to the undercut processing mechanism described in [4], each holding portion (21, 22) is supported such that one end side thereof is guided to the support base (40). The intermediate portion (30) is supported so as to be able to be driven in the forward and backward directions with respect to the holding portions (21, 22), and is interposed between the holding portions (21, 22) via the support base (40). Arranged. With such a configuration, a plurality of parts of the receiving mold (20) can be combined as a unit via the support base (40).

  According to the undercut mechanism described in [5] above, the support base (40) crosses one end side of each of the holding portions (21, 22) with the advancing / retreating direction of the intermediate portion (30). , Guide means (42) for guiding in directions toward or away from each other is provided. As a result, as the intermediate portion (30) is moved back and forth between the holding portions (21, 22), the holding portions (21, 22) are surely moved to the support positions that are separated from each other and the escape positions that are close to each other. I can guide you. Moreover, the position shift in each position of each holding | maintenance part (21, 22) can be prevented.

  According to the undercut processing mechanism described in [6] above, the support base (40) and the driving means (50) of the intermediate part (30) are respectively mounted on the base (60) to form an integral unit. To do. Thereby, the receiving side mold (20) can be handled together with the driving means (50) of the support base (40) and the intermediate part (30), and easily positioned relative to the material (70) before press working. Adjustments can be made.

According to the undercut processing mechanism according to the present invention, after performing the press working to dent the both wall surfaces of the material as the press-molded product to the inner sides facing each other, the receiving side along the material at the time of the press working The mold can be easily removed to the outside, the molding cycle is short, the configuration is simple, the assembly process does not take time and effort, the cost can be reduced, and a compact configuration is possible. It is possible to meet the demand for space saving.
In addition, the material to be processed can be firmly held during press working to prevent deformation without causing a reduction in the structural strength of the receiving mold, and undercut in a wide range of dimensions during die cutting. Can be easily punched out.

It is explanatory drawing which shows typically operation | movement of the receiving side metal mold | die of the undercut process mechanism which concerns on embodiment of this invention. It is a perspective view which shows the receiving side metal mold | die of the undercut process mechanism which concerns on embodiment of this invention. It is a disassembled perspective view which shows the receiving side metal mold | die of the undercut process mechanism which concerns on embodiment of this invention. It is explanatory drawing which shows operation | movement of the receiving side metal mold | die of the undercut process mechanism which concerns on embodiment of this invention. It is explanatory drawing which shows operation | movement of the whole unit containing the receiving side metal mold | die of the undercut process mechanism which concerns on embodiment of this invention. It is explanatory drawing which shows operation | movement of the receiving side metal mold | die of the undercut process mechanism which concerns on another embodiment of this invention. It is explanatory drawing which shows the variation of the unevenness | corrugation in each holding | maintenance part of the receiving side metal mold | die of the undercut process mechanism which concerns on another embodiment of this invention. It is explanatory drawing which shows the principle of the receiving side metal mold | die of the conventional undercut process mechanism. It is explanatory drawing which shows the specific example of the receiving side metal mold | die of the conventional undercut process mechanism. It is explanatory drawing which shows the specific example of the improvement plan of the receiving side metal mold | die of the conventional undercut process mechanism.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments representing the present invention will be described below with reference to the drawings.
First, the basic principle of the undercut processing mechanism will be described with reference to FIG. This undercut treatment mechanism was applied to the material to be pressed as a material to be pressed, and at least one of its wall surfaces was recessed inwardly facing each other, and was then aligned with the material during the pressing. The receiving mold 10 can be taken out.

  FIG. 1 is an explanatory view schematically showing the operation of the receiving mold 10 which is a main part of the undercut processing mechanism. FIG. 1 (a) shows the state of the receiving mold 10 at the time of press working in a perspective view, a side view, and a front view from the left in the figure, and FIG. 1 (b) shows the receiving side in a process in the middle of die cutting. The state of the mold 10 is also shown in the perspective view, the side view, and the front view from the left in the drawing. FIG. 2C shows the state of the receiving mold 10 at the time of die-cutting, from the left in the drawing, from a perspective view, a side view, and a front view.

  The receiving mold 10 schematically shown in FIG. 1 is divided into a plurality in the thickness direction, a pair of holding parts 11 and 12, and an intermediate part 13 disposed between the holding parts 11 and 12, At least. Here, each holding | maintenance part 11 and 12 and the intermediate part 13 are not limited to what each consists of one component, You may comprise combining several components. For example, the intermediate portion 13 may be configured by two parts separated on the left and right.

  Each of the holding portions 11 and 12 is supported so as to be movable at a support position separated from each other in the thickness direction and an escape position approaching in the thickness direction. The intermediate portion 13 is supported so as to be movable in the advancing / retreating direction (left and right direction in the side view of FIG. 1) between the holding portions 11 and 12, and the holding portions 11 are moved along with the entry between the holding portions 11 and 12. , 12 are moved to the support position, and the holding portions 11, 12 are moved to the escape position as the holding portions 11, 12 are withdrawn. Further, both surfaces of the intermediate portion 13 are tapered so as to increase the distance between the holding portions 11 and 12 as they enter between the holding portions 11 and 12. The inner surface side of each holding part 11, 12 is inclined according to the taper inclination of the intermediate part 13.

  Each holding portion 11, 12 is provided with an unevenness 14 that meshes in the thickness direction on the inner surfaces facing each other. The concave and convex portions 14 have a convex portion 14a protruding by an amount corresponding to the inclination of the taper with respect to a reference surface on the inner surface side parallel to the outer surface side of the holding portions 11 and 12, and the taper between the convex portions 14a. Recessed portions 14b having a depth corresponding to the inclination of each of them extend alternately in parallel with the advance / retreat direction. The convex portion 14a and the concave portion 14b are formed in a rectangular cross section that meshes with each other.

  The unevenness 14 of each holding part 11, 12 is shifted to both sides one by one up and down, and is set so as to be engaged when overlapped. As a result, the concave and convex portions 14 of the respective holding portions 11 and 12 are in contact with both end surfaces of the intermediate portion 13 at the support position, but are engaged with each other at the escape position so that the respective holding portions 11 and 12 are combined. The thickness (L3 in FIG. 1 (c)) is set to be smaller than the dimension (L2 in FIG. 1 (b)) in which the tips of the convex portions 14a of the unevenness 14 are brought into contact with each other.

  Next, an example of a specific configuration of the undercut processing mechanism will be described with reference to FIGS. The undercut processing mechanism performs press processing in which both the wall surfaces of the material 70 (refer to FIG. 4) as a press-molded product are recessed inwardly facing each other. The receiving side mold 20 that has been placed can be taken out of the material 70. Here, the material 70 is a rail-shaped member having a substantially U-shaped cross section with both ends and one side end opened. An example in which burring processing is performed as press processing on both upper and lower wall surfaces of the material 70 will be described below.

  FIG. 2 is a perspective view showing a receiving mold 20 that is a main part of the undercut processing mechanism. FIG. 3 is an exploded perspective view showing the receiving mold 20. FIG. 4 is an explanatory view showing the operation of the receiving side mold 20. FIG. 4A shows a state of the receiving side mold 20 at the time of press working in a perspective view, a longitudinal sectional view, and a front view from the left in the figure, and FIG. 4B shows the receiving side in a process in the middle of die cutting. The state of the mold 20 is similarly shown from the left in the drawing with a perspective view, a longitudinal sectional view, and a front view. FIG. 2C also shows a state of the receiving side mold 20 at the time of die cutting from the left side in the figure, a perspective view, a longitudinal sectional view, and a front view. FIG. 5 is an explanatory view showing the operation of the entire unit including the receiving side mold 20.

  As shown in FIG. 4, circular holes 71 facing each other are formed in advance on both wall surfaces of the material 70 by general-purpose punching or the like. The burring process is to form flanges projecting into the material 70 simultaneously at the edges of the circular holes 71 on both wall surfaces of the material 70. Although not shown in FIG. 4, a pair of burring punches (see FIG. 10B) that can approach the material 70 from above and below are arranged, and each burring punch is attached to the piston rod 51 of the hydraulic cylinder 50. ing.

  By driving the hydraulic cylinder 50, the tip of each burring punch is forcibly inserted into the circular holes 71 on both wall surfaces of the material 70 from the outside, and at the same time, flanges facing inward are formed at the edges of the upper and lower circular holes 71. At this time, the material 70 is fixed by a jig or the like not shown. Here, since the configuration of the hydraulic cylinder and the like is common, detailed description is omitted. The specific material of the material 70 may be any metal that can be pressed, such as aluminum or aluminum alloy.

  The specific shape of the material 70 is not limited to the rail-shaped one having the substantially U-shaped cross section shown in the drawing, and the material having the substantially C-shaped cross section or any other material having a tubular closed cross section regardless of a circular or square cross section. It may be. Further, it is sufficient that both wall surfaces are portions facing each other, and it does not matter whether they are flat or curved. Moreover, the shape of the circular hole 71 which is a to-be-processed part is not limited to what is illustrated, and includes not only a through-hole but also a dent. Furthermore, it is not always necessary to provide the workpieces on both wall surfaces of the material 70, and it may be provided on only one of the wall surfaces.

  As shown in FIGS. 2 and 3, the receiving-side mold 20 is divided into three in the thickness direction that intersects the advancing and retreating direction from the opening on the one end side of the material 70. The receiving mold 20 divided into three parts enters the material 70 from one end side opening, and a pair of holding parts 21 and 22 for supporting the periphery of the circular hole 71 which is a processed part of both wall surfaces from the inside, The intermediate portion 30 is disposed between the holding portions 21 and 22. The holding parts 21 and 22 and the intermediate part 30 form a substantially cube-shaped die that matches the internal space of the material 70 in a state where the holding parts 21 and 22 and the intermediate part 30 overlap each other.

  Each holding portion 21, 22 has a recess recessed inwardly corresponding to the processed portion (around the circular hole 71) on both wall surfaces of the material 70 on the outer surface side along the inside of both wall surfaces of the material 70 during press working. A portion 23 is provided. The escape portion 23 is formed as a round hole into which the flange formed around the circular hole 71 and the tip of the burring punch can be respectively inserted by the height of the flange.

  The holding portions 21 and 22 are spaced apart from each other in the thickness direction, the support surface where the outer surface side excluding the escape portion 23 is in contact with the inside of both wall surfaces of the material 70, and the outer surface side is close to each other in the thickness direction. These are supported so as to be movable at the escape position where they are separated from the inside of both wall surfaces. The intermediate portion 30 is supported so as to be movable in the forward / backward direction between the holding portions 21 and 22, and moves the holding portions 21 and 22 to the support position as they enter between the holding portions 21 and 22. The holding units 21 and 22 are moved to the escape positions as the holding units 21 and 22 are withdrawn.

  Each holding portion 21, 22 is integrally provided with base end portions 24, 25 supported by a support base 40, which will be described later, on one end side, in addition to a portion on the outer surface side along the inside of both wall surfaces of the material 70. Is provided. Moreover, the intermediate part 30 is formed in the taper longitudinal cross-sectional shape which becomes thin gradually toward the front-end | tip. That is, the upper and lower surfaces of the intermediate part 30 are tapered so as to increase the distance between the holding parts 21 and 22 as they enter between the holding parts 21 and 22. The inner surfaces of the holding portions 21 and 22 are also inclined according to the taper inclination of the intermediate portion 30.

  Each holding portion 21, 22 is provided with an uneven portion 26 that meshes in the thickness direction on the inner surfaces facing each other. The concave and convex portions 26, similar to the concave and convex portions 14 described above, are convex portions 26a that protrude by an amount corresponding to the inclination of the taper with respect to the reference surface on the inner surface side parallel to the outer surface side that is horizontally disposed on the holding portions 21 and 22. Concave portions 26b having a depth corresponding to the inclination of the taper are formed between the convex portions 26a so as to extend alternately in parallel. Here, the bottom surfaces of the concave portions 26b are arranged on the reference surface, and the end surfaces of the convex portions 26a are arranged on the inclined surface of the taper.

  The concave and convex portions 26 of the holding portions 21 and 22 are also shifted to both sides one by one up and down, and when they overlap, the upper convex portion 26a is in the concave portion 26b that overlaps downward, and the lower convex portion 26a is upward. They are set so as to mesh with each other in the overlapping concave portion 26b. As a result, the concave and convex portions 26 of the respective holding portions 21 and 22 are in contact with both ends of the intermediate portion 30 at the support position, but are engaged with each other at the escape position so that the respective holding portions 21 and 22 are combined. The thickness (L3 in FIG. 4C) is set to be smaller than the dimension (L2 in FIG. 4B) in which the tips of the convex portions 26a of the concavo-convex 26 are brought into contact with each other.

  As described above, at the time of the press working shown in FIG. 4A, the intermediate portion 30 is sandwiched between the holding portions 21 and 22, and the thickness of the entire front end side of the receiving side mold 20 is earned by L1. be able to. The process in the middle of die-cutting shown in FIG. 4B is the timing at which the tips of the holding parts 21 and 22 are in contact with the horizontal plane, and if there is no unevenness 26, each holding part 21 is originally at that position. , 22 are in contact with each other, and at this time, the thickness of the entire front end side of the receiving mold 20 is L2. However, by providing the holding portions 21 and 22 with the projections and depressions 26, the thickness of the entire front end side of the receiving side mold 20 can be kept small by this meshing amount, and when the die is cut as shown in FIG. The thickness of the entire front end side of the receiving side mold 20 is L3 (<L2).

  As shown in FIG. 2, the receiving-side mold 20 enters the material 70 in a state of extending from the support base 40 that is opposed to the one end side opening of the material 70 (see FIG. 4). Each holding portion 21, 22 is supported by a support base 40 at one end side so as to be movable between the support position and the escape position. Specifically, at one end side of each holding portion 21, 22, base end portions 24, 25 guided in the vertical direction to the support position and the escape position while being sandwiched inside the support base 40. It is provided integrally.

  The support base 40 is composed of a pair of plate members 41 and 41 facing left and right. On the inner surface of each plate member 41, guide means for guiding the base end portions 24 and 25 of the holding portions 21 and 22 so as to be movable in the vertical direction is provided. The guide means is a pair of concave grooves 42 and 42 facing each other. As will be described later, the support base 40 is formed as a unit integrated with a hydraulic cylinder 50 which is a driving means of the intermediate portion 30.

  On both side end surfaces of the base end portions 24 and 25 of the holding portions 21 and 22, a pair of ridges 27 and 27 are slidably fitted into the respective concave grooves 42. Here, each ridge 27 may be provided in any one of the support base 40 and each holding part 21, 22, and a concave groove 42 is provided in either one. In short, any structure may be employed as long as the holding portions 21 and 22 are guided in directions toward or away from each other, and the one provided on the support base 40 side corresponds to the guide means.

  As shown in FIG. 5, the intermediate part 30 of the receiving mold 20 is supported by the support base 40 so as to be able to be driven in the forward and backward directions. FIG. 5A shows the state of the entire unit including the receiving mold 20 during press working, and FIG. 5B shows the state of the entire unit including the receiving mold 20 during die cutting. Yes. The support base 40 and the hydraulic cylinder 50 are each mounted on a base 60 and formed as an integral unit.

  A base end portion of the intermediate portion 30 is integrally connected to a piston rod 51 of a hydraulic cylinder 50 that is a driving means. By driving the hydraulic cylinder 50, the intermediate portion 30 moves in the advancing / retreating direction while being sandwiched between the holding portions 21 and 22 through the support base 40, and also advances / retreats with respect to the material 70 from the one end side opening. . Here, the hydraulic cylinder 50 is attached to the proximal end side of the base 60, and the support base 40 is attached to the distal end side of the base 60.

Next, the operation of the undercut processing mechanism shown in FIGS.
In FIG. 4, when the material 70 is first pressed, the receiving mold 20 is positioned in the material 70 in advance. At this time, the intermediate part 30 is withdrawn from between the pair of holding parts 21 and 22, and the holding parts 21 and 22 are set to escape positions close to each other in the thickness direction. After the holding portions 21 and 22 of the receiving side mold 20 are positioned along the both wall surfaces of the material 70 from the inside, the intermediate portion 30 is inserted between the holding portions 21 and 22.

  As the intermediate portion 30 enters between the holding portions 21 and 22, the holding portions 21 and 22 are separated from each other in the thickness direction. And the escape part 23 in the outer surface side of each holding | maintenance part 21 and 22 corresponds to the circular hole 71 in both the wall surfaces of the raw material 70, and the outer surface side of each holding | maintenance part 21 and 22 is the both wall surfaces of the raw material 70 except the said part. To face from the inside. In such a support position, the thickness L1 of the entire front end side of the receiving mold 20 matches the dimension between both wall surfaces of the material 70. Then, the circular holes 71 on both wall surfaces of the material 70 are simultaneously pressed from the outside by a burring punch, and as shown in FIG. 4A, the edge of each of the circular holes 71 protrudes inward to form a flange. (Burring) is performed.

  At the time of such pressing, both wall surfaces of the material 70 are supported from the inside by the holding portions 21 and 22 within a range that does not hinder the processing including the periphery of the processed portion (around the circular hole 71). Here, an intermediate portion 30 is sandwiched between the holding portions 21 and 22, and at the tip end side of the receiving-side mold 20 in which these portions are combined, each portion in the thickness direction is subjected to a load by pressing. The holding parts 21 and 22 and the intermediate part 30 are in an overlapping state. Thereby, there is no possibility that the periphery of the processed part will be excessively bent inward and deformed with the press working, and distortion and deformation around the processed part can be prevented.

  Moreover, the thickness of the location containing the convex part 26a of the unevenness | corrugation 26 in the circumference | surroundings of the escape part 23 among each holding | maintenance parts 21 and 22 is the depth of the to-be-processed part recessed inside the to-be-molded product (material 70). That is, it is larger than the height of the flange formed around the circular hole 71. Therefore, there is no possibility that the front end of the flange, which is a part to be processed, may interfere with the intermediate part 30 through the relief part 23 in each holding part 21, 22 at the time of pressing.

  After the press working, the intermediate portion 30 of the receiving mold 20 is retracted from between the holding portions 21 and 22. Then, the holding parts 21 and 22 approach each other in the thickness direction, and the respective outer surface sides move toward the escape positions where they are separated from the both wall surfaces of the material 70. The process in the middle of die-cutting shown in FIG. 4B is the timing at which the tips of the holding parts 21 and 22 are in contact with the horizontal plane, and if there is no unevenness 26, each holding part 21 and 22 is originally at that position. At the time, the thickness of the entire front end side of the receiving side mold 20 is L2.

  Each holding portion 21, 22 is in contact with the inner surface side facing each other at a location where the intermediate portion 30 is not interposed therebetween, but on each inner surface side, an unevenness 26 that meshes in the thickness direction is provided. Therefore, on the inner surface side of each holding portion 21, 22, the convex portion 26 a of the unevenness 26 comes into contact with the intermediate portion 30 at the support position, but the upper and lower unevennesses 26 mesh with each other at the escape position.

  As shown in FIG. 4C, when the holding portions 21 and 22 reach the escape position during die cutting, the actual thickness L3 that the holding portions 21 and 22 are combined with each other, It can be suppressed smaller than the dimension L2 at the time of butting. In particular, the thickness L3 when the concave and convex portions 26 of the holding portions 21 and 22 are overlapped with each other is smaller than the dimension between the processed portions on both wall surfaces of the press-formed product.

  Thereby, the expansion-contraction width | variety of the thickness for avoiding the to-be-processed part of a press-molded product can be ensured large at the time of die cutting, without causing the structural strength fall in each holding | maintenance part 21 and 22. Therefore, when the receiving-side mold 20 is taken out during die-cutting, the upper and lower ends of the holding parts 21 and 22 of the receiving-side mold 20 are not caught on the processed part in the press-formed product (material 70). Can be easily taken out. The press-formed product means a product after the material 70 is pressed.

  Further, both surfaces of the intermediate portion 30 of the receiving side mold 20 are tapered so as to increase the distance between the holding portions 21 and 22 as they enter between the holding portions 21 and 22. On the other hand, the inner surface side of each holding part 21, 22 is inclined according to the inclination of the taper including the unevenness 26. Therefore, by moving the intermediate portion 30 between the holding portions 21 and 22, the holding portions 21 and 22 can be easily moved to the support positions that are separated from each other and the escape positions that are close to each other. In addition, although the convex part 26a contact | abuts to the intermediate part 30 among the unevenness | corrugations 26, it can be made to slidably contact with respect to the intermediate part 30 by aligning the height of the convex part 26a to the inclined surface of a taper.

  Further, each holding portion 21, 22 of the receiving side mold 20 is supported such that one end side thereof is guided by the support base 40. The intermediate portion 30 is supported so as to be able to be driven in the forward and backward directions with respect to the holding portions 21 and 22, and is disposed between the holding portions 21 and 22 via the support base 40. With such a configuration, a plurality of parts of the receiving mold 20 can be combined as a unit via the support base 40.

  The pair of plate members 41, 41 of the support base 40 are recessed grooves as guide means that are guided by the protruding strips 27 of the base end portions 24, 25 of the holding portions 21, 22 movably fitted in the vertical direction. 42 is provided. As a result, as the intermediate portion 30 is moved forward and backward between the holding portions 21 and 22, the holding portions 21 and 22 can be reliably guided to the support positions that are separated from each other and the escape positions that are close to each other. In addition, it is possible to prevent displacement of each holding portion 21, 22 at each position.

  Further, as shown in FIG. 5, the support base 40 and the hydraulic cylinder 50 that is the driving means of the intermediate portion 30 are each mounted on a base 60 and formed as an integral unit. As a result, the receiving mold 20 can be handled together with the support base 40 and the hydraulic cylinder 50, and the position can be easily adjusted with respect to the material 70 before press working. The support base 40 and the hydraulic cylinder 50 may be attached to the base 60 so that the position thereof can be adjusted, for example, in the forward / backward direction. Or you may attach the base 60 with respect to another process stand (not shown) so that position adjustment is possible, for example in an advancing / retreating direction. Thereby, the position adjustment with respect to the material 70 side becomes easier.

  FIG. 6 is an explanatory view schematically showing the operation of the receiving mold 15 of the undercut processing mechanism according to another embodiment. FIG. 6A shows a state of the receiving mold 15 at the time of press working from a left side in the drawing in a perspective view, a side view, and a front view, and FIG. 6B shows the receiving mold 15 at the time of die cutting. This state is also shown from the left in the figure by a perspective view, a side view, and a front view.

  In the receiving side mold 15 according to this other embodiment, the taper in the intermediate portion 13 and the intermediate portion 30 described above is not provided on both surfaces of the intermediate portion 18, and the intermediate portion 18 has a uniform thickness. It is formed in a flat plate shape. Similarly, each holding part 16, 17 is also formed in a flat plate shape having a uniform plate thickness including the unevenness 19. That is, in the holding portions 16 and 17, the convex portions 19a of the concave and convex portions 19 are all at the same height, and the concave portions 19b are all formed at the same depth.

  The holding portions 16 and 17 are movably supported at a support position (see FIG. 6A) separated from each other in the thickness direction and an approaching escape position (see FIG. 6B), respectively. . The intermediate portion 18 is supported so as to be movable in the advancing and retracting direction between the holding portions 16 and 17. The intermediate portion 18 is driven in the advancing / retreating direction by driving means (not shown). When the intermediate portion 18 enters between the holding portions 16 and 17, the holding portions 16 and 17 are moved to the support positions, and the intermediate portion 18 is moved to the respective holding portions. Each of the holding parts 16 and 17 is set so as to move to the escape position when the holding parts 16 and 17 are withdrawn.

  In the holding portions 16 and 17, the convex portion 19 a of the concave and convex portion 19 abuts against the intermediate portion 18 at the support position, and the concave and convex portion 19 meshes at the escape position. At this time, the combined thickness of the holding portions 16 and 17 (L2 in FIG. 6B) is not only the thickness of the entire receiving mold 15 (L1 in FIG. 6A), It becomes smaller than the thickness when the convex portions 19a of the concavo-convex portions 19 of the holding portions 16 and 17 are butted together.

  FIG. 7 is a schematic diagram showing another shape variation of the above-described irregularities 14, 19, 26. The plate-like members arranged in the vertical direction shown in FIGS. 7A to 7D correspond to the pair of holding portions 16 and 17, respectively. As in the case of FIG. 6, the relief portions 23 that should be in appropriate positions of the holding portions 16 and 17 are not shown. Moreover, the same uneven | corrugated variation can be applied also to each holding | maintenance part 21 and 22 with an inclination.

  As described above, the unevenness provided on the inner surface side of the pair of holding portions is not limited to the convex portion and the concave portion of the rectangular cross section like the unevenness 14, 19, 26 described above, and is shown in FIGS. 7 (a) and 7 (b). As shown in FIGS. 7 (c) and 7 (d), the trapezoidal cross section and the triangular cross section may be alternately arranged, or any shape that engages in the thickness direction on the inner surfaces facing each other may be used. In short, it is only necessary that the thickness when the projections and depressions of the projections and bumps are in contact with the intermediate portion and the projections and depressions are engaged with each other is smaller than the dimension in which the tips of the projections are butted together.

  In addition, the intermediate portion 30 described above is formed as a smooth surface on both sides, but the concave and convex portions 26, for example, in the holding portions 21 and 22 are fitted to both sides of the intermediate portion 30 so as to be movable in the forward and backward directions. Such irregularities may be provided so as to be guided so as to be movable relative to each other. Thereby, the intermediate part 30 can be guided so as to smoothly advance and retract between the holding parts 21 and 22.

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to the above-described embodiments, and changes and additions may be made without departing from the scope of the present invention. It is included in the present invention. For example, the shapes of the material 70 and the circular hole 71 that is the part to be processed are not limited to those specifically illustrated, and include not only a through-hole but also a dent. Furthermore, it is not always necessary to provide the workpieces on both wall surfaces of the material 70, and it may be provided on only one of the wall surfaces.

  In addition, the specific shape of the material 70 (press-formed product) is not limited to the illustrated rail-like shape having a substantially U-shaped cross section, but includes a material having a tubular closed cross section. The shape does not need to extend straight in the forward / backward direction, and may be bent at a predetermined angle in the middle. That is, the part from the opening on the one end side of the material to the processed part may be a shape extending at least on the same axis as the advance / retreat direction, and the shape on the other end side is bent in a direction intersecting the advance / retreat direction, A shape that overhangs or spreads may be used.

  Furthermore, the support base 40 is provided with a concave groove 42 as a guide means for guiding the convex stripes 27 of the holding portions 21 and 22, but the specific configuration of the guide means is such as a convex stripe and a concave groove. It is not limited to the mating relationship. For example, a pin is provided as a guide means on the support base 40 side, and a hole through which the pin is relatively movable is provided in each holding part 21, 22. A pin may be provided, and a hole through which the pin is relatively movable may be provided on the support base 40 side as guide means.

  The undercut processing mechanism can be configured as a unit that is pre-installed in the mold, and it is possible to perform burring processing facing the inside on both wall surfaces of the material with high work efficiency and high efficiency. Suitable for applications and functions to mass-produce molded products with high processing accuracy without distortion or deformation of the workpiece.

DESCRIPTION OF SYMBOLS 10 ... Reception side metal mold 11 ... Holding part 12 ... Holding part 13 ... Intermediate | middle part 14 ... Unevenness 14a ... Convex part 14b ... Recessed part 15 ... Receiving side metal mold 20 ... Receiving side metal mold 21 ... Holding part 22 ... Holding part 23 ... Escape part 24 ... Base end part 25 ... Base end part 26 ... Concavity and convexity 26a ... Convex part 26b ... Concave part 27 ... Convex strip 30 ... Intermediate part 40 ... Support base 41 ... Plate material 42 ... Dent groove 50 ... Hydraulic cylinder 60 ... Base Table 70 ... Material

Claims (6)

It is possible to take out the receiving mold that was placed in the material at the time of pressing after pressing the material to be pressed into the inner wall facing at least one of both wall surfaces. Undercut processing mechanism
The receiving mold is divided into a plurality of thickness directions intersecting with the advancing and retreating direction from the one end opening of the material, and enters the material from the one end opening to support the both wall surfaces from the inside. And at least an intermediate part arranged between the holding parts,
Each holding part is provided with a relief part recessed inward corresponding to the processed part on at least one of both wall surfaces of the raw material on the outer surface side along the raw material during the press working,
The holding portions are spaced apart from each other in the thickness direction, and a support position where the outer surface side excluding the escape portion is in contact with the inside of the both wall surfaces, and the outer surface side is separated from the inside of the both wall surfaces while approaching each other in the thickness direction. To the escape position to be moved,
The intermediate portion is supported so as to be movable in the forward / backward direction between the holding portions.When the intermediate portion enters between the holding portions, the holding portions move to the support position, while when the intermediate portions retreat from the holding portions, The holding part moves to the escape position,
The holding portions are provided with unevenness that meshes in the thickness direction on the inner surfaces facing each other, and the convex portion of the unevenness contacts the intermediate portion at the support position, while the unevenness meshes at the escape position, An undercut processing mechanism, wherein a thickness of the holding portions is set to be smaller than a dimension in which the convex and concave portions of the concave and convex portions are abutted with each other.   The thickness including the convex portion around the relief portion among the holding portions is larger than the depth of the processed portion recessed inside the press-formed product, and the concave and convex portions mesh with each other to hold the holding portions. 2. The undercut processing mechanism according to claim 1, wherein the combined thickness is set to be smaller than a dimension between processed parts on at least one of the two wall surfaces. Both sides of the intermediate portion are tapered to increase the distance between the holding portions as they enter between the holding portions,
3. The undercut processing mechanism according to claim 1, wherein an inner surface side of each holding portion is inclined according to the inclination of the taper including the unevenness. Each holding portion is supported such that one end side thereof is guided by the support base,
4. The undercut processing mechanism according to claim 1, wherein the intermediate portion is supported so as to be drivable in the forward / backward direction, and is arranged between the holding portions via the support base. 5.   5. The guide base according to claim 4, wherein the support base is provided with guide means for guiding one end side of each holding portion in a direction that crosses the advancing and retreating direction of the intermediate portion and approaches or separates from each other. Undercut processing mechanism.   The undercut processing mechanism according to claim 4 or 5, wherein the support base and the driving means of the intermediate portion are each mounted on a base and formed as an integral unit.

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