JP3408151B2 - Apparatus for forming a metal product in which a cylindrical portion is integrally formed concentrically and a method for forming such a metal product - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal product forming apparatus in which cylindrical parts are concentrically and integrally formed, and a method for forming such a metal product. In particular, the outer surface of the base side corner part of the cylindrical part has a curved surface shape. A metal product forming apparatus configured to present,
The present invention relates to a method for forming such a metal product.

[0002]

BACKGROUND ART As is well known, in vehicles such as automobiles and various mechanical equipment, a cylindrical portion such as a viscous coupling housing, a one-piece wheel, or a pulley with a boss is concentrically formed integrally. Metal products are often used.

When molding a metal product in which the cylindrical portions are concentrically formed integrally with each other, various methods have heretofore been adopted. Particularly, among these various molding methods, the purpose is For metal materials that give metal products to
A method that combines cleaving process and rolling process is
It is advantageously adopted as one of the industrially advantageous methods.

That is, a method of forming the metal product by the split-rolling process is described in, for example, Japanese Patent Publication No. 9-50629.
As shown in Japanese Patent Publication No. 5, first, a holding die is used in which a cylindrical portion forming portion having an outer peripheral surface having a shape corresponding to the inner peripheral surface of the cylindrical portion of the target metal product is provided in the center of the upper surface. , A metal material having a central hole, which has a disk shape having a diameter larger than that of the upper surface, is coaxially placed on the holding die with the central hole inserted in the cylindrical portion forming portion. Then, the metal material and the holding die are integrally rotated. Next, a cleavage rolling roller having an outer peripheral surface having a substantially V-shaped cross section that is convex outward is tilted so that a part of the outer peripheral surface extends in the vertical direction, and is rotated around its central axis. In this state, the outer peripheral portion of the metal material is moved downward while being in contact with the outer peripheral portion of the metal material to bend and deform the outer peripheral portion of the metal material downward. After that, the cleaving and rolling roller is moved in the horizontal direction toward the center of the metal material while the top of the V-shaped outer peripheral surface of the cleaving and rolling roller is in contact with the bent portion of the metal material. Then, by pressing inward in the radial direction against the metal material, at the top of the outer peripheral surface of the split rolling roller, the surface portion on the inner peripheral side of the bent portion of the metal material,
While cleaving from the outer peripheral part, the cleaved part is pressed by a part extending in the vertical direction on the outer peripheral surface of the cleaving and rolling roller, and pinched with the cylindrical part forming part. , The cleavage site is formed into a cylindrical shape,
The cylindrical portion is formed so that the intended metal product is obtained.

By the way, in a metal product in which such a cylindrical portion is integrally formed, it is desirable that the outer surface of the corner portion on the base side of the cylindrical portion has a rounded curved surface shape. This is because, by doing so, the mechanical strength of the joint portion between the cylindrical portion and the base portion on which the cylindrical portion is erected is increased, and the robustness of the metal product can be more advantageously ensured.

A metal product having a cylindrical portion in which the outer surface of the corner portion on the base side has a curved surface shape is formed in the metal product forming method employing the rolling and splitting method as disclosed in the above publication. As the split-rolling roller used, a roller whose outer peripheral surface has a substantially mountain-shaped cross section and whose apex of the outer peripheral surface has a curved surface shape can be easily obtained, but is disclosed in the above publication. In the molding method used, the structure of the molding device is unavoidable because the molding device used requires a mechanism for moving the split rolling roller in two directions, the vertical direction and the horizontal direction. However, there is an inherent problem that it becomes complicated and that leads to cost increase.

Therefore, the following method is conceivable as another method for obtaining the above metal product. That is, first, the fixed die and the fixed die are arranged so as to be able to move toward and away from the fixed die and integrally rotatable around the central axis, and the shape of the inner peripheral surface of the cylindrical portion of the target metal product is arranged. A molding die including a movable die having a cylindrical portion forming portion having an outer peripheral surface corresponding to the above, and a metal material having a circular protrusion-shaped processed portion at its central portion are prepared. Then, while this metal material is concentrically sandwiched between the movable die cylindrical portion forming portion and the fixed die in the forming die in the processed portion,
The movable type and the fixed type are integrally rotated. afterwards,
Under such an integrated rotation state, a cleaving and rolling roller having a cylindrical outer peripheral surface, and one of the edge portions of the outer peripheral surface having a curved surface shape is used as a central axis of a movable die and a fixed die. While rotating around the axis of rotation parallel to, while being in contact with the outer peripheral portion of the processed portion of the metal material at the edge portion of the curved surface shape, move only in the direction toward the center portion of the metal material. By pressing the metal material inward in the radial direction, the edge portion causes the processed portion to be cleaved from the outer peripheral portion of the metal material in the protruding direction, while the cleaving is performed. The part thus formed is pressed by the entire outer peripheral surface of the cylindrical surface, and is squeezed between the movable cylindrical part forming part and the cleaving part corresponding to the cylindrical surface shape of the cylindrical part forming part. A cylindrical shape is formed, and the outer surface of the base side corner of the cleaved portion is formed by the above-mentioned etching. It formed into a curved surface shape corresponding to the curved surface shape of the parts in such a manner as to form the cylindrical portion is the outer surface of the base side corner portion which is a curved surface shape Te following. According to such a method, it is sufficient to move the tear-rolling roller in only one direction, and therefore, the structure of the moving mechanism of the tear-rolling roller can be advantageously simplified.

However, in actuality, when a metal product is obtained according to the above-mentioned process using a cleaving and rolling roller having a curved surface-shaped edge portion, when the processed portion is cleaved from the outer peripheral portion of the metal material. In addition, the roller is pushed up by the reaction force against the pressing force applied to the metal material, which is caused to act on the curved surface-shaped edge portion of the cleaving and rolling roller, so that the to-be-processed portion should be cleaved. A part of the part is left without being cleaved, and the volume of the cleaved part of the processed part is reduced by the amount of the remaining part,
As a result, a large problem is caused in that the cylindrical portion including the dehisced portion cannot be formed into a desired size or shape.

[0009]

The present invention has been made in view of the circumstances as described above, and a problem to be solved by the present invention is that a cylindrical portion in which an outer surface of a corner portion on the base side has a curved surface shape. However, it is an object of the present invention to provide a forming apparatus and a forming method that can advantageously form a concentric and integrally formed metal product having a desired size and shape.

[0010]

In order to solve such a problem, in the present invention, a cylindrical portion is concentrically and integrally formed, and an outer surface of a corner portion on the base side of the cylindrical portion is a curved surface. A forming apparatus for forming a shaped metal product, comprising: (a) a first die having a cylindrical portion forming portion having an outer peripheral surface corresponding to the inner peripheral surface shape of the cylindrical portion; Coaxially and relatively close to the cylindrical portion forming portion of the first mold,
A metal product, comprising: a second mold arranged so as to be separable, and having a circular protrusion-shaped processed portion at a central portion, which has a diameter larger than the outer diameter of the cylindrical portion forming portion of the first mold The metal material for giving the above is sandwiched between the cylindrical portion forming portion and the second die so as to be positioned concentrically with respect to the cylindrical portion forming portion and the second die in the processed portion. And a molding die configured such that the cylindrical portion forming portion and the second die can integrally rotate about their axes as a first rotation axis, and (b) parallel to the first rotation axis. While being rotatable about the second rotation axis, and arranged so as to be able to move toward and away from the molding die in a direction perpendicular to the first rotation axis,
The edge portion located on the side of the second mold is a roller configured to have a rectangular shape with a right angle or an acute angle,
The metal material is pressed inward in the radial direction in a state in which the rectangular edge portion is brought into contact with the outer peripheral surface of the processed portion of the metal material that is integrally rotated about the first rotation axis. Thereby, the cleaving roller that cleaves the processed portion from the outer peripheral portion of the metal material in the protruding direction at the edge portion of the square shape, and (c) the first parallel to the first rotation axis. It is arranged so as to be rotatable about a third rotation axis and to be movable toward and away from the molding die in a direction perpendicular to the first rotation axis, while the first die is An outer peripheral surface facing the outer peripheral surface of the cylindrical portion forming portion has a cylindrical surface shape, and an edge portion on the side of the second mold has a curved surface shape. The edge part of the base of the cleaved part of the processed part In a state of being brought into contact with the side corner portion, the cleavage site of the processed portion is pressed inward in the radial direction of the metal material, and the pressure is clamped between the cylindrical portion forming portion, While forming the cleaving portion into a cylindrical shape corresponding to the cylindrical portion forming portion, the outer surface of the base side corner portion of the cleaving portion is formed into a curved surface shape corresponding to the edge portion of the curved surface shape, It is characterized in that it includes a cylindrical portion forming roller that forms the cylindrical portion.

That is, in the metal product forming apparatus according to the present invention, in which the cylindrical parts are concentrically and integrally formed, the metal material giving the target metal product is first processed in the processed part. In the state of being sandwiched between the cylindrical part forming part of the mold and the second mold, they can be integrally rotated together with the cylindrical part forming part and the second mold with their axes as the first rotation shaft. On the other hand, under the integrally rotating state of such a metal material, a cleaving roller having an edge portion having a right angle or an acute angle is rotated around a second rotation axis parallel to the first rotation axis. By being pressed in the radial direction against the processed part of the metal material while being pressed, the processed part is cleaved from the outer peripheral part of the metal material at the rectangular edge part. It has become. afterwards,
The cleaved portion of the processed portion formed in this way is further cylindrically formed inward in the radial direction of the metal material by the cylindrical portion forming roller having the outer peripheral surface of the cylindrical surface shape and the edge portion of the curved surface shape. By being pressed and pinched between the cleaving part and the cylindrical part forming part of the first mold, the entire cleaving part is formed into a cylindrical shape corresponding to the cylindrical part forming part, and the cleaving part is formed. The outer surface of the corner portion on the base side of the portion is formed into a curved surface shape corresponding to the edge portion of the curved surface shape.

As described above, in the forming apparatus according to the present invention, the portion to be processed of the metal material is to be cleaved from the outer peripheral portion of the metal material at the rectangular edge portion of the cleaving roller. On the other hand, between the outer peripheral surface of the cylindrical portion forming roller and the outer peripheral surface of the cylindrical portion forming portion of the first die, the entire cleaved portion of the processed portion is the outer periphery of the cylindrical portion forming portion. In addition to being formed into a cylindrical shape corresponding to the surface shape, the outer surface of the base side corner portion of such a cleavage site is formed into a curved surface shape at the curved edge portion of the cylindrical portion forming roller. Therefore, unlike the case of simply cleaving the processed part from the outer peripheral part of the metal material at the edge of the curved surface shape, all the parts to be cleaved of the processed part are surely cleaved. In this way, sufficient volume of such dehiscence site can be ensured. And than and cleavage site with such a sufficient volume, with the desired size,
The outer surface of the corner portion on the base side can be stably molded into a predetermined cylindrical shape with the curved surface shape.

Therefore, in the forming apparatus according to the present invention, a metal product is surely formed by concentrically and integrally forming a cylindrical portion having a curved outer surface of the base side corner portion with a desired size and shape. As a result, a robust metal molded product having excellent mechanical strength at the joint portion of the cylindrical portion can be obtained extremely advantageously.

Moreover, in such a molding apparatus, both of the two types of rollers, that is, the cleaving roller and the cylindrical portion forming roller, move only in the direction perpendicular to the first rotation axis which is the axis of the molding die. Since the desired cylindrical portion is formed by being pressed, the conventional molding apparatus in which a mechanism for moving the split rolling roller in two directions of the vertical direction and the horizontal direction is essential. In comparison, the structure of the moving mechanism of each roller and thus the structure of the entire device can be advantageously simplified.

Further, in the present invention, a metal product is formed in which the cylindrical portion is concentrically and integrally formed, and the outer surface of the corner portion on the base side of the cylindrical portion has a curved surface shape. (A) a first mold having a cylindrical part forming part having an outer peripheral surface corresponding to the inner peripheral surface shape of the cylindrical part, and a cylindrical part forming part of the first mold. A second die arranged coaxially and relatively close to and away from each other, and having a circular projection shape with a diameter larger than the outer diameter of the cylindrical portion forming portion of the first die. A metal material for giving the metal product, which has a processed part in the central part, is formed in the processed part so as to be positioned concentrically with the cylindrical part forming part and the second mold. While sandwiching between the second mold and the second mold, the cylindrical portion forming portion and the second mold have their axes as the first rotation axis. A molding die configured to be integrally rotatable, and (b) rotatably around a second rotation axis parallel to the first rotation axis and with respect to the molding die, While being arranged so as to be able to move toward and away from each other in a direction perpendicular to the rotation axis, the outer peripheral surface of the first die facing the outer peripheral surface of the cylindrical portion forming portion has a cylindrical surface shape, and the second outer peripheral surface has a cylindrical shape. A metal material to be processed, which is a roller configured such that an edge portion located on the mold side has a curved surface shape, and the edge portion having the curved surface shape is integrally rotated around the first rotation axis. By pressing the metal material inward in the radial direction in the state of being brought into contact with the outer peripheral surface of the portion, the processed portion is separated from the outer peripheral portion of the metal material at the edge portion of the curved surface shape. , Tearing in the protruding direction, while tearing the processed part The resulting site,
By sandwiching the cleft portion with the cylindrical portion forming portion, the cleaving portion is formed into a cylindrical shape corresponding to the cylindrical portion forming portion, and the outer surface of the base side corner portion of the cleaving portion is formed into the curved surface shape. A cylindrical portion forming roller that forms a cylindrical portion corresponding to the edge portion of, and (c) is pressed inward in the radial direction with respect to the metal material by the cylindrical portion forming roller, While slidingly contacting the end surface of the cylindrical portion forming roller opposite to the second mold side, allowing the rotation of the cylindrical portion forming roller about the second rotation axis,
A metal product, in which a cylindrical portion is concentrically formed integrally with the metal material and includes movement preventing means for preventing movement in a direction perpendicular to the pressing direction of the metal material and in a direction away from the second mold. A molding device is also a feature thereof.

In summary, according to the present invention, in the apparatus for forming a metal product in which the cylindrical parts are concentrically and integrally formed, the metal material that gives the target metal product is first processed in the processed part. In the state of being sandwiched between the cylindrical part forming part of the mold and the second mold, they can be integrally rotated together with the cylindrical part forming part and the second mold with their axes as the first rotation shaft. It is like this. A cylindrical portion forming roller having a cylindrical outer peripheral surface and an edge portion located on the second die side having a curved surface shape has an end surface on the side opposite to the second die side. In the state of being slidably brought into contact with the movement preventing means and being prevented from moving in the direction away from the second mold, the second rotation axis is rotated about the second rotation axis parallel to the first rotation axis. By being pressed inward in the radial direction with respect to the portion to be processed of the metal material that is integrally rotated, the portion to be processed has a curved surface-shaped edge portion and an outer peripheral portion of the metal material. While the cleaving part of the processed part is clamped between the cylindrical part forming roller and the cylindrical part forming part of the first die, the cleaving part of the processed part is cleaved. The entire part is molded into a cylindrical shape that corresponds to the cylindrical part The outer surface of the proximal corners of 該裂 open site, it has become to be formed into a curved surface shape corresponding to the edge portion of the curved surface shape.

As described above, in the forming apparatus according to the present invention, by pressing the cylindrical portion forming roller radially inward with respect to the portion to be processed of the metal material, the portion to be processed becomes an outer peripheral portion of the metal material. The cleaving part is formed into a cylindrical shape, and the outer surface of the base side corner part is formed into a curved surface shape. When the forming roller is pressed against the processed portion of the metal material, the cylindrical portion forming roller is prevented from moving in the direction away from the second die. During the progress of dehiscence, the cylindrical portion forming roller may move in a direction away from the processed portion of the metal material sandwiched between the second die and the first die. , It can certainly be prevented.

Therefore, in such a forming apparatus, when the edge portion of the curved surface shape of the cylindrical portion forming roller progresses to rupture of the processed portion of the metal material, the edge portion is pressed against the metal material. It can be advantageously avoided that the cylindrical portion forming roller is pushed up by the reaction force against the pressure and a part of the portion to be cleaved of the processed portion is left without being cleaved, Further, by doing so, all of the portion to be cleaved of the processed portion can be surely cleaved, and the volume of such a cleaved portion can be ensured sufficiently, so that it has such a sufficient volume. The dehiscence portion can be stably molded into a predetermined cylindrical shape having a desired size and the outer surface of the base side corner portion having a curved surface shape.

Therefore, even in the forming apparatus according to the present invention, a metal product in which the cylindrical portion having the curved outer surface of the corner portion on the base side is concentrically integrally formed with a desired size and shape is surely obtained. It is possible to obtain a strong metal molded product having excellent mechanical strength at the joint portion of the cylindrical portion, which is extremely advantageous.

Further, in the molding apparatus according to the present invention, there is only one type of cylindrical portion forming roller having a cylindrical outer peripheral surface and a curved surface shaped edge portion. Since the part forming roller can perform the splitting process and the rolling process on the processed part of the metal material at once, the splitting roller for performing the splitting process and the rolling process for performing the rolling process are performed. The structure can be advantageously simplified as compared with a molding apparatus having two types of forming rollers and configured to separately perform the two types of processing. Efficiency can be effectively achieved.

Moreover, in such a molding apparatus, the cylindrical portion forming roller is moved only in the direction perpendicular to the first rotation axis, which is the axis of the molding die, so that the desired cylindrical portion is formed. Therefore, compared to the conventional molding device that requires a mechanism for moving the split-rolling roller in two directions, the vertical direction and the horizontal direction, the structure of the moving mechanism of each roller There is the advantage that a simplification of the overall structure can advantageously be made possible.

In such a molding apparatus according to the present invention, it is advantageous that the cylindrical portion forming portion is formed so as to project from the central portion of the surface of the first die facing the second die. On the other hand, the movement preventing means is constituted by an outer peripheral portion of a surface of the first die facing the second die, and further, the cylindrical portion forming roller is formed in a radial direction with respect to the metal material. It is configured to be brought into slidable contact with the outer peripheral portion of the facing surface in the pressed state toward one side. In such a molding apparatus, the movement preventing means can be formed integrally with the first mold, whereby the structure of the entire apparatus can be simplified even more advantageously.

Further, in the molding apparatus according to the present invention as described above, preferably, the cylindrical portion forming roller is adapted to move the portion to be processed at the time of tearing of the portion to be processed from the outer peripheral portion of the metal material. A thickening means is provided which abuts the tip of the dehisced portion of the processed portion and prevents extension of the dehisced portion accompanying the progress of the dehiscence, thereby increasing the wall thickness of the dehisced portion. , Composed. By adopting such a configuration, the wall thickness of the cylindrical portion integrally formed with the intended metal product can be advantageously increased, and thereby,
The radius of curvature of the curved surface shape of the corner portion on the base side of the cylindrical portion can be made large, and as a result, the mechanical strength of the cylindrical portion can be effectively ensured, and an even higher quality metal product can be obtained. Will be obtained.

[0024] It should be noted that such a thickening means is advantageously
The cylindrical portion forming roller is constituted by a flange portion provided so as to project radially outward with respect to the outer peripheral surface and continuously extend in the circumferential direction.

Further, according to the present invention, a metal product is formed by concentrically and integrally forming a cylindrical portion, and the outer surface of the corner portion on the base side of the cylindrical portion is formed into a curved surface shape. (A) a first die having a cylindrical portion forming portion having an outer peripheral surface corresponding to the inner peripheral surface shape of the cylindrical portion, and coaxially and relatively to the cylindrical portion forming portion. A second mold arranged so that it can approach and separate from each other, using a molding die configured to be able to integrally rotate with the axial center of the cylindrical portion forming portion and the second mold as the first rotation shaft, The metal material for giving the metal product, which has a circular protrusion-shaped processed portion having a diameter larger than the outer diameter of the cylindrical portion forming portion of the first mold in the central portion, is formed in the processed portion by the cylinders. Between the cylindrical part forming part and the second mold so as to be positioned concentrically with respect to the part forming part and the second mold. A step of integrally rotating the cylindrical portion forming portion and the second die while holding the same, and (b) a step of integrally rotating the metal material around the first rotation axis. In a rotating state, a cleaving roller configured such that the edge portion located on the side of the second mold has a right-angled or acute-angled rectangular shape, By pressing the metal material inward in the radial direction while rotating it around the second rotation axis parallel to the first rotation axis in a state of being brought into contact with the outer peripheral portion of the workpiece. A step of cleaving the processed portion from an outer peripheral portion of the metal material in a protruding direction thereof, and (c) the first mold under an integrally rotating state of the metal material about the first rotation axis. Of the outer peripheral surface of the cylindrical portion forming portion facing the outer peripheral surface of A cylindrical portion forming roller having a columnar surface shape and having an edge portion on the side of the second die configured to have a curved surface shape, at the edge portion of the curved surface shape, with the cleaving roller. While being abutted against the base side corner of the cleaved part of the part to be cleaved, the cleaved part is rotated about a third rotation axis parallel to the first rotation axis. By pressing the cleaving portion inward in the radial direction of the metal material and pinching the cleaving portion between the cylindrical portion forming roller and the cylindrical portion forming portion, the cleaving portion is formed in the cylindrical portion. Forming into a cylindrical shape corresponding to the forming portion, and forming the outer peripheral surface of the base side corner portion of the cleaving portion into a curved surface shape corresponding to the edge portion of the curved surface shape to form the cylindrical portion, It is also a feature that it includes.

According to the method for forming a metal product according to the present invention as described above, all the parts to be cleaved of the processed part are
At the edge of the cleaving roller having a right angle or an acute angle, the cleaving roller can be surely cleaved, and a sufficient volume of the cleaving site can be secured, whereby the cleaving site is
With a desired size, the outer surface of the corner portion on the base side can be stably molded into a predetermined cylindrical shape with the curved surface shape. Then, as a result, the cylindrical portion whose outer surface of the base side corner portion is a curved surface shape has a desired size and a predetermined shape, is integrally formed at a concentric position, and the intended metal product is, It can be molded extremely advantageously.

Further, in the method for molding a metal product in which the cylindrical portions according to the present invention are concentrically and integrally formed,
Advantageously, as the process of cleaving the processed part from the metal material progresses, the outer diameter on the base side of the cleaved part of the processed part is a cylindrical part of the metal product to be formed. The cleaving step is completed when the dimension becomes equal to the outer diameter of the cylinder plus twice the radius of curvature of the curved surface of the base of the cylindrical portion. As a result, the outer surface of the corner portion on the base side of the cylindrical portion formed at the cleavage site has a curved surface shape in the cylindrical portion forming roller while the volume of the cleavage site of the processed portion is sufficiently secured. The edge portion can be more surely molded into the curved surface shape. It should be noted that the outer diameter on the base side of the cleaved portion of the processed portion is the outer diameter of the cylindrical portion of the metal product to be formed, and the radius of curvature of the curved surface of the base portion of the cylindrical portion. When the dimension becomes a value obtained by adding twice the value of the above, including the time when the outer diameter on the base side of the cleavage site of the processed portion reaches the specific dimension as described above and immediately before or immediately after that. It is a thing.

Further, according to the present invention, a metal product is formed in which the cylindrical portion is concentrically and integrally formed, and the outer surface of the corner portion on the base side of the cylindrical portion has a curved surface shape. (A) A cylindrical workpiece having a diameter larger than the outer diameter of the cylindrical portion forming member with respect to the cylindrical portion forming portion having an outer peripheral surface corresponding to the inner peripheral surface shape of the cylindrical portion. Arranging a metal material for giving the metal product in coaxial contact with each other, and (b) having a cylindrical surface-shaped outer peripheral surface corresponding to the outer peripheral surface shape of the cylindrical portion, and Using a cylindrical portion forming roller in which one of the edge portions of the surface has a curved surface shape, the edge portion of the curved surface shape is brought into contact with the outer peripheral surface of the processed portion of the metal material that is rotated around the central axis. And the end on the side opposite to the side on which the curved edge portion is formed. Is allowed to rotate around the central axis of the cylindrical portion forming roller, but is slidably contacted with a movement preventing means for preventing movement of the cylindrical portion forming roller in the direction opposite to the edge portion forming side along the central axis. In this state, the cylindrical portion forming roller and the metal material are pressed against the processed portion of the metal material while relatively rotating about their respective central axes or relatively moving in the circumferential direction. By doing so, the processed portion is cleaved from a base-corresponding portion corresponding to the base of the metal product in the metal material, while the cleaved portion of the processed portion is referred to as the cylindrical portion forming member. The cleaved portion is formed into a cylindrical shape corresponding to the cylindrical portion forming member, and the outer surface of the base side corner of the cleaved portion is curved corresponding to the edge portion of the curved surface shape. Form into a surface shape and And forming a cylindrical portion, also a method of forming a metal product cylindrical portion, which are integrally formed concentrically, it is an its features.

According to the method for forming a metal product according to the present invention as described above, the cylindrical portion forming roller is pushed up when the cleavage of the processed portion of the metal material by the curved surface shaped edge portion of the cylindrical portion forming roller progresses. As a result, it can be advantageously avoided that a part of the part to be cleaved of the processed part is left without being cleaved, whereby the whole part of the part to be cleaved is to be cleaved. Can be dehisced reliably,
As a result, the cylindrical portion in which the outer surface of the base-side corner portion has a curved surface shape is integrally formed in a concentric position with a desired size and a predetermined shape, and the target metal product is extremely advantageous. It can be molded.

[0030]

BEST MODE FOR CARRYING OUT THE INVENTION In order to more specifically clarify the present invention, a metal product forming apparatus and a metal product forming method according to the present invention in which cylindrical portions are concentrically and integrally formed. The specific configuration of will be described in detail with reference to the drawings.

First, in FIG. 1, an intermediate molded body of a pulley with a boss as a metal product, that is, a boss portion is formed, but a hub portion having a groove for hanging a belt or the like is not yet formed. 1 schematically shows an example of a metal product forming apparatus having a structure according to the present invention, which is used for forming an unfinished product. As is clear from this figure, the metal product forming apparatus 10 is configured to have the forming die 14 arranged on the base 12.

More specifically, this metal product forming apparatus 1
As shown in FIG. 2, the molding die 14 constituting 0 is an upper die 16 as a first die and a lower die 18 as a second die.
It has and.

The upper die 16 of the molding die 14 has an upper die side holder 20 and an upper die side pad 22.
Then, the upper mold side holder 20 and the upper mold side pad 22
Each has a substantially stepped columnar shape with a large diameter portion on the upper side and a small diameter portion on the lower side. Further, here, in particular, the small-diameter portion on the lower side of the upper die side pad 22 is used as the boss portion forming portion 24 as the cylindrical portion forming portion, and the boss portion of the intermediate molded body of the desired bossed pulley is formed. It has an outer diameter substantially the same as the inner diameter, a height higher than that, and an outer peripheral surface shape corresponding to the inner surface shape of the boss portion (see FIG. 6). Furthermore, this upper die side pad 2
A center pin hole 28 having a predetermined depth is provided at the center of the lower surface of the second boss forming portion 24.

Then, such an upper die side pad 22 is
The upper mold holder 20 is coaxially positioned below the upper mold holder 20 and is bolted to the upper mold holder 20. As a result, the upper die 16 is configured as an integral body in which the upper die side holder 20 and the upper die side pad 22 are assembled so as not to rotate relative to each other, and the upper die 16 as such an integral body. The boss portion forming portion 24 is positioned at the center of the lower surface of the above so as to project vertically downward along the central axis of the upper mold 16.

On the other hand, the lower mold 18 comprises a lower mold side holder 30 and a lower mold side pad 32. Further, the lower die side holder 30 of the lower die 18 has substantially the same outer shape as the upper die side holder 20 of the upper die 18. Further, the lower mold side pad 32 has a generally cylindrical block shape with a low height, and its upper surface has a shape corresponding to the lower surface of the metal material 26, that is, as shown in FIG. A circular projection 3 into which a processed portion 27 having a circular projection shape in the metal material 26 can be fitted on the back side thereof.
3 is formed integrally with the metal material 2
6 are configured so that they can be placed concentrically in a close-fitting state. Then, as is apparent from FIG. 2, the lower mold side pad 32 is connected to the lower mold holder 30.
Above the upper die 16 at a position opposed to the upper die side pad 22 of the upper die 16 and are coaxially arranged with respect to the lower die holder 30 and the upper die side pad 22, respectively. In the arranged state, it is bolted to the lower mold side holder 30.

Thus, the lower mold 18 is the lower mold holder 3
0 and the lower die side pad 32 are coaxially and integrally assembled so as not to rotate relative to each other, and on the upper surface of the lower die side pad 32, It is arranged coaxially with the upper mold 16 while facing the boss forming portion 24. A centering center pin 34 is formed at a central portion of the upper surface of the lower die side pad 32 of the lower die 18 so as to project at a predetermined height.
Is moved toward the lower die 18, the centering center pin 34 is formed in the boss portion forming portion 24 of the upper die side pad 22 and the center pin hole 28 is formed.
It is designed to be inserted inside.

Then, as shown in FIG. 1, the lower mold 18 having such a structure is used in the lower mold holder 30.
It is fixedly attached to the lower die mounting plate 36. Further, the lower die mounting plate 36 is provided with a substantially cylindrical support portion 38 that is formed to project coaxially with the lower die 18 at the center of the surface opposite to the side on which the lower die 18 is attached. The support portion 38 has a motor housing hole 40 formed in the base 12, and is projected into the motor housing hole 40. Further, such a motor housing hole 40 is provided at the center of the base 12.
The plurality of bearings 42 are arranged in the upper part thereof, and the motors 44 are fixedly housed in the lower part thereof. Then, with the support portion 38 of the lower die mounting plate 36 that is projected into the motor housing hole 40 being rotatably supported by the plurality of bearings 42 in the motor housing hole 40, the motor 44 is Is coaxially attached to the rotary shaft 46 of. As a result, as the motor 44 is driven to rotate, the lower die mounting plate 36, and further, the entire lower die 18 fixedly mounted on the lower die mounting plate 36, the rotation shaft 46 of the motor 44, that is, the center of the lower die 18 It can be rotated about the axis 29.

On the other hand, the upper die 16 is fixedly attached to the upper die mounting plate 48 in the upper die side holder 20. The upper die mounting plate 48 is the base 1
It is rotatably supported on the upper die moving plate 50, which is arranged above the base plate 2 so as to face the base 12. That is, in the upper die mounting plate 48, a substantially cylindrical support portion 52 is coaxially provided with the upper die 16 at the center of the surface opposite to the side on which the upper die 16 is attached. The upper mold moving plate 5 is formed by projecting and the supporting portion 52 is formed.
0 in the center portion of the base 12 motor housing hole 40
It is projected into a through hole 54 formed concentrically with and is rotatably supported by a plurality of bearings 56 arranged in the through hole 54.

An upper die moving plate 50 rotatably supporting the upper die mounting plate 48 is arranged so as to surround the upper die mounting plate 48 and extends upward from the outer peripheral portion of the base 12. It is slidably supported in the vertical direction with respect to the plurality of guide posts 58 thus mounted.
Further, a fixed plate 60 is fixedly attached to the upper ends of the plurality of guide posts 58, and the piston rod 62 is mounted on the base of the fixed plate 60 by a hydraulic mechanism (not shown) at the center. An upper die moving plate pressurizing cylinder 64 for causing the protrusion operation is attached to the 12th side. And
The piston rod 6 in the upper moving plate pressing cylinder 64
The tip of 2 is fixed to the upper die moving plate 50.

As a result, the upper die 16 is moved to the upper die mounting plate 4
It is designed such that it can rotate around the central axis 29 of the upper die 16 integrally with the upper die 8, and as the piston rod 62 in the upper die moving plate pressure cylinder 64 projects and retracts. The upper die mounting plate 48 and the upper die 16 can be moved up and down.

Thus, in the molding die 14, the upper die 16 and the lower die 18 are coaxially arranged on the base 12, and the upper die 16 and the lower die 18 are arranged. However, the piston rod 62 in the upper die moving plate pressurizing cylinder 64 can be moved toward and away from each other by the projecting and retracting operations of the piston rod 62. And upper mold 1
By moving 6 closer to the lower mold 18, a metal material 26, which is concentrically placed on the lower mold side pad 32 of the lower mold 18 and provides an intermediate molded body of the desired bossed pulley, is attached. , The upper die side pad 22 in the upper die 16
The boss portion forming portion 24 of the upper die 16 in the processed portion 27 having a circular protrusion shape having a diameter larger than that of the boss portion forming portion 24 of
And the lower die side pad 32 of the lower die 18 can be concentrically sandwiched, and by rotating the motor 44 under such a sandwiched state. The upper mold 16 and the lower mold 18 are configured so as to be able to rotate integrally while sandwiching the metal material 26 with the central axis 29 thereof as the first rotation axis.

In the metal product forming apparatus 10 according to this example, the cleaving roller 68 and the cylindrical portion are formed on the base 12 to which the forming die 14 having the above-described structure is attached. A boss portion forming roller 70 as a roller is rotatably supported in a state of being held by the clamps 78, 78, and is movable toward and away from the molding die 14.

That is, on the outer peripheral portion of the base 12, roller pressing cylinder mounting portions 72, 72 are integrally erected at predetermined positions at positions facing each other with the molding die 14 interposed therebetween. There is. In addition, at the upper portion of each roller pressing cylinder attachment portion 72, a piston rod 74 is moved toward the center side of the base 12, that is, the arrangement side of the molding die 14 by a hydraulic mechanism (not shown). Center axis 29
A roller pressurizing cylinder 76 that is operated to project and retract in a direction perpendicular to is attached. Further, a clamp 78 having a substantially U-shaped cross section is fixed to the tip end portion of the piston rod 74 protruding from the inside of the roller pressure cylinder 76 so as to face the molding die 14. In addition, in the clamp 78, the tip portions 80 of the U-shaped upper portion and the lower portion can be separated by removing a set screw (not shown). Roller mounting holes 84, 84 are respectively formed at the abutting portions of the clamp body 82 and the clamp body 82 in a state of corresponding to each other in the vertical direction. Furthermore, the roller mounting plate 86 is provided on the lower side of the roller mounting holes 84, 84.
The roller mounting shaft 88 formed by integrally forming
It is located parallel to the central axis 29 of the No. 4 and is rotatably attached around its axis.

The cleaving roller 68 as a whole has a substantially cylindrical shape with a low height. The cleaving roller 68 projects radially outwardly by a predetermined height at its upper end and extends continuously in the circumferential direction. While the flange portion 92 is integrally formed, the lower edge portion has a rectangular edge portion 9 having a rectangular shape at right angles.
4 is configured. Furthermore, the cleaving roller 6
In the center of 8, the roller mounting shaft 88 of the clamp 78 is attached.
A roller mounting shaft insertion hole 90 through which the roller is inserted is formed so as to penetrate in the height direction.

Then, the cleaving roller 68 having such a structure has a U-shaped upper portion of one of the two clamps 78, 78 which are positioned to face each other with the molding die 14 interposed therebetween. Between the portion and the lower portion, the flange portion 92 is provided with the outer peripheral surface thereof facing the outer peripheral surface of the boss portion forming portion 24 of the upper die 16 in the closed state of the molding die 14. In such a manner that the rectangular edge portion 94 is made to project toward the portion forming portion 24, and the square edge portion 94 can be opposed to the outer peripheral portion of the processed portion 27 of the metal material 26 placed on the lower die 18 of the molding die 14. Further, in such an arrangement state, the roller mounting shaft 88 rotatably mounted on the one clamp 78 about the axis is inserted into the roller mounting shaft insertion hole 90. , Take the roller It is bolted to the roller mounting plate 86 of the shaft 88.

As a result, the cleaving roller 68 rotates about its central axis 96 with the central axis 96 as the second rotational axis which is the first rotational axis and which is parallel to the central axis 29 of the molding die 14. Further, the boss portion forming portion 24 of the upper die 16 in the molding die 14 in the die closing state is caused by the protrusion and the retracting operation of the piston rod 74 in the roller pressing cylinder 76. On the other hand, they can be moved toward and away from each other in the direction perpendicular to the central axis 29. In particular, when the cleaving roller 68 moves toward the boss portion forming portion 24, the square edge portion 94 is sandwiched between the boss portion forming portion 24 and the lower die pad 32 of the lower die 18. The metal material 26 can be brought into contact with the outer peripheral surface of the processed portion 27.

On the other hand, the boss portion forming roller 70 also has a substantially cylindrical shape with a low height as a whole. Further, in the boss portion forming roller 70, the outer peripheral surface 98 is configured to have a cylindrical surface shape extending in the axial direction with the same diameter, and the lower edge portion thereof is substantially 1 The curved edge portion 100 has a curved surface shape that draws an arc for / 4 rounds. Further, at the central portion of the boss forming roller 70, the clamp 78 is also provided as in the cleaving roller 68.
A roller mounting shaft insertion hole 90 through which the roller mounting shaft 88 of FIG.

The boss portion forming roller 70 having such a structure is located in a U-shape of the other clamp 78, which is positioned opposite to the one of the two clamps 78, 78 to which the cleaving roller 68 is attached. Between the upper portion and the lower portion, the outer peripheral surface 98 is made to face the outer peripheral surface of the boss portion forming portion 24 of the upper die 16 in the closed state of the molding die 14, and the curved edge portion 100 is provided. Are arranged so that they can face each other at the same height position as the arrangement position of the rectangular edge portion 94 of the cleaving roller 68, and under such an arrangement state, with respect to the other clamp 78. Roller mounting shaft 8 rotatably mounted around the axis
8 is inserted into the roller mounting shaft insertion hole 90, and is bolted to the roller mounting plate 86 of the roller mounting shaft 88.

As a result, in the boss forming roller 70, the central axis 102 is used as a third axis of rotation which is a first axis of rotation and is parallel to the center axis 29 of the molding die 14. The boss portion of the upper mold 16 in the molding die 14 in the mold closing state is associated with the protrusion and the retracting operation of the piston rod 74 in the roller pressing cylinder 76. For the forming unit 24,
The central axis 29 can be moved toward and away from each other in a direction perpendicular to the central axis 29. In particular, when the boss portion forming roller 70 moves closer to the boss portion forming portion 24, the metal material 26 that is sandwiched between the boss portion forming portion 24 and the lower die side pad 32 of the lower die 18 is covered. The curved edge portion 10 of the boss portion forming roller 70 is attached to the same portion as the contact portion of the square edge portion 94 of the cleaving roller 68 to the processed portion 27.
0 can be abutted.

Thus, in the metal product forming apparatus 10 according to this example, the metal material 26 is processed into the boss portion forming portion 24 of the upper die 16 and the lower die side pad 32 of the lower die 18 in the processed portion 27. While being sandwiched between the roller pressing cylinder and the roller pressing cylinder, the roller rod pressing cylinder 76 attached to the one roller pressing cylinder mounting portion 72 has a piston rod 74 projecting from the roller cleaving roller. 68 is moved closer to the boss portion forming portion 24 of the upper die 16 of the forming die 14 in the closed state of the die, so that the cleaving roller 68 causes the portion of the metal material 26 to be processed at the square edge portion 94. While being brought into contact with the outer peripheral surface of the metal material 27 and further rotated in a direction opposite to the rotation direction of the metal material 26, the outer peripheral surface of the processed portion 27 is directed inward in the radial direction of the metal material 26. Can be pressed It has become way. By further moving the cleaving roller 68 closer to the boss forming portion 24, the processed portion 27 of the metal material 26 can be cleaved (divided) from the outer peripheral portion of the metal material 26. (See FIG. 5).

In the cleaving process of the processed portion 27 from the outer peripheral portion of the metal material 26, the flange portion 92 is integrally formed on the upper end portion of the cleaving roller 68 as described above. Therefore, the length (height) of the cleaved portion of the processed portion 27 is gradually increased with the progress of the cleaving, but the tip of the cleaved portion of the processed portion 27 is gradually increased. From the time when the abutment is brought into contact with the lower surface of the flange portion 92, an increase in the length (height) of the dehiscence portion is prevented, and instead, the thickness of the dehiscence portion is increased. Becomes

Further, the piston rod 74 for supporting the cleaving roller 68 is retracted and operated, and the cleaving roller 6 is
8 is moved away from the molding die 14, while the piston rod 74 supporting the boss portion forming roller 70 is operated to project so that the boss portion forming roller 70 moves the upper die 16 in the molding die 14 in the mold closed state. When the boss forming roller 70 is moved closer to the boss forming portion 24,
In the curved edge portion 100, of the processed portion 27,
Base-side corner 10 of the cleavage site 104 by the cleavage roller 68
6 is rotated in the direction opposite to the rotation direction of the metal material 26 while being brought into contact with the outer surface of the metal material 26, and the cleavage site 104 is radially inward on the outer peripheral surface 98 of the metal material 26. And toward the boss forming portion 24,
It can be clamped. When the boss portion forming roller 70 moves closer to the boss portion forming portion 24, the entire cleavage portion 104 of the processed portion 27 corresponds to the cylindrical outer peripheral surface shape of the boss portion forming portion 24. The outer surface of the base side corner portion 106 of the cleaved portion 104 is formed into a curved surface shape corresponding to the outer surface shape of the curved edge portion 100 while being formed into a cylindrical shape. .

In summary, in the metal product forming apparatus 10 according to this example, first, the processed portion 27 of the metal material 26 is processed.
Is cleaved from the outer peripheral portion of the metal material 26 by the square edge portion 94 of the cleaving roller 68, and then the cleaving portion 104 of the processed portion 27 is entirely boss-forming roller 70.
Is clamped between the outer peripheral surface 98 of the upper mold 16 and the outer peripheral surface of the boss portion forming portion 24 of the upper die 16 to form a cylindrical shape corresponding to the outer peripheral surface shape of the boss portion forming portion 24. At the same time, the outer surface of the base side corner portion 106 of the dehiscence site 104 is
At the curved edge portion 100 of the boss portion forming roller 70,
It can be molded into a curved surface shape corresponding to it. In addition, the cleavage site 104 of the processed portion 27
When the metal material is cleaved from the outer peripheral portion, the thickness can be increased.

Therefore, in such a metal product forming apparatus 10, a tear-roll rolling roller whose lower edge portion is configured to have a curved surface shape is simply used, and a lower surface exhibiting the curved surface shape of the tear-roll rolling roller is used. At the side edge portion, the processed portion of the metal material is cleaved to form a cleaved portion of the processed portion into a cylindrical shape, and the outer surface of the base side corner portion of the cleaved portion is the lower edge. Unlike the case of forming the curved surface shape corresponding to the portion, all the portions to be cleaved of the processed portion 27 can be surely cleaved, and the volume of the cleaved portion 104 can be secured sufficiently. In addition, the dehiscence portion 104 having such a sufficient volume is stably formed into a predetermined cylindrical shape having a sufficient size and the outer surface of the base side corner portion 106 having a curved surface shape. To get.

Therefore, when the metal product forming apparatus 10 according to this example is used, the boss portion in which the outer surface of the base side corner portion 106 has a curved surface shape is concentrically formed integrally with a desired size and a predetermined shape. The intermediate molded body of the bossed pulley thus obtained can be reliably molded, and as a result,
Thus, a robust intermediate molded body of a boss pulley, which has excellent mechanical strength at the joint portion of the boss portion, and by extension, a boss pulley can be obtained extremely advantageously.

Further, in the metal product forming apparatus 10, the flange 92 is provided at the upper end of the cleaving roller 68, and when the cleaving part 104 is cleaved from the outer peripheral part of the metal material 26, Since the cleavage site 104 is made thicker, the thickness of the boss portion provided at the cleavage site 104 can be made sufficiently thick.
Thereby, an intermediate molded body can be molded which gives a more robust bossed pulley.

As described above, when the intermediate molded body of the bossed pulley is obtained, the metal product molding apparatus 10 having the structure shown in FIG. 1 is extremely advantageously used. For example, the work is advanced according to the following steps, so that the intended intermediate molded body of the pulley with the boss is obtained.

That is, first, as shown in FIG. 3, the upper mold 16 and the lower mold 18 are separated from each other, and the molding die 14 in the mold open state is subjected to intermediate molding of the desired pulley with boss. A metal material 26 that gives a body is set. More specifically, the metal material 26 has a substantially disk-shaped overall shape, and is determined by cutting or press-bending the center portion of the metal material 26 in consideration of the height of the boss portion of the boss pulley. A circular processed part 27 having a different diameter is stepped and preformed so as to integrally project. Then, this metal material 26 is inserted into the center hole 31 formed in the center thereof while the centering center pin 34 provided on the lower die side pad 32 of the lower die 18 is inserted, and On the lower surface side, it is placed so as to cover the circular protrusion 33 of the lower mold side pad 32. As a result, the metal material 26 is set concentrically with the lower mold 18.

Then, the piston rod 62 in the upper die moving plate pressurizing cylinder 64 is operated to project so that the upper die moving plate 50 is moved downward to move the boss of the upper die 16 as shown in FIG. The tip of a centering center pin 34 of the lower die side pad 32, which extends through the center hole 31 of the metal material 26, is inserted into the center pin hole 28 of the portion forming portion 24, and the boss portion forming portion is formed. 24 is brought into contact with the processed portion 27 of the metal material 26 in a pressed state. As a result, the metal material 26 is concentrically sandwiched in the processed portion 27 between the boss forming portion 24 of the upper die 16 and the lower die 18.

After that, the motor 44 attached to the lower die holder 30 of the lower die 18 is rotationally driven to rotate the entire lower die 18, and as shown in FIG.
The lower die 18 and the upper die 16, and the metal material 26 sandwiched between them are integrally rotated around the central axis 29 of the lower die 18 and the upper die 16. On the other hand, a piston rod 74 in a roller pressure cylinder 76 (not shown), which supports a clamp 78 to which the cleaving roller 68 is rotatably attached, is operated to project to move the clamp 78 toward the molding die 14 side. By doing so, the cleaving roller 68 is pressed against the outer peripheral surface of the processed portion 27 of the metal material 26 which is integrally rotated around the central axis 29 at the square edge portion 94. At that time, the cleaving roller 68 is rotated around the central axis 96 thereof in the direction opposite to that of the metal material 26.

As a result, the processed portion 27 of the metal material 26 is
Is gradually cleaved from the outer peripheral portion of the metal material 26 by the rectangular edge portion 94 of the cleaving roller 68, while the tip of the cleaving portion 104 is provided with a flange provided at the upper end of the cleaving roller 68. The length (height) of the dehisced portion 104 is increased by contacting the lower surface of the portion 92 with the progress of dehiscence.
It blocks at a given size while at the same time increasing its wall thickness.

Here, in particular, the outer diameter of the cleaving portion 104 (indicated by m in FIG. 5) is caused by the cleaving of the processed portion 27 due to the movement of the cleaving roller 68 toward the molding die 14. (Dimension) is the outer diameter of the boss 108 finally formed at the cleavage site 104 (dimension indicated by n in FIG. 7).
In addition, the radius of curvature of the curved surface shape of the outer surface of the base side corner portion 106 of the boss portion 108, that is, the radius of curvature of the curved surface of the curved edge portion 100 of the boss portion forming roller 70 (r in FIG. 6).
When the size reaches twice the size shown in,
Or just before or just after that (that is, m = n + 2
When r, m≈n + 2r), the approaching movement of the cleaving roller 68 toward the molding die 14 is stopped, and the cleaving process of the processed portion 27 is ended.

Next, the piston rod in the roller pressure cylinder is pulled in and actuated to separate the cleaving roller 68 from the metal material 26, and then the boss forming roller 70 is rotatable as shown in FIG. The piston rod 74 in the roller pressure cylinder 76 (not shown) that supports the clamp 78 attached to the above is operated to project, and the clamp 78 is moved toward the molding die 14 side, whereby In the integrally rotated state, the curved edge portion 100 of the boss portion forming roller 70 is brought into contact with the outer surface of the base side corner portion 106 of the cleavage portion 104 of the processed portion 26, and the cylinder of the boss portion forming roller 70 is formed. The planar outer peripheral surface 98 is pressed against the outer peripheral surface of the cleaving portion 104, and the cleaving portion 104 is formed between the outer peripheral surface 98 of the boss portion forming roller 70 and the upper die side pad 22. It occupied assay sandwiched between the outer peripheral surface of the scan unit forming part 24. At this time, even the boss portion forming roller 70 is rotated around the central axis 102 in the direction opposite to the direction of the metal material 26.

As a result, the entire cleavage site 104 thickened by the flange portion 92 of the cleavage roller 68 is formed into a cylindrical shape corresponding to the outer peripheral surface shape of the boss portion forming section 24, and the cleavage is performed. The outer surface of the base side corner portion 106 of the open portion 104 is formed into a curved surface shape corresponding to the outer surface shape of the curved edge portion 100.

Thus, as shown in FIG. 7, an intermediate molded body 110 of the boss pulley having the thick boss portion 108 integrally and concentrically formed on one surface is obtained. Then, thereafter, the piston rod 74 in the roller pressure cylinder 76 (not shown) is retracted and actuated, and the piston rod 62 in the upper die moving plate pressure cylinder 64 is also retracted and actuated to move the upper die 16 upward. The intermediate molded body 1 of the obtained pulley with a boss
The mold 10 is released from the molding die 14.

According to the method of this embodiment, the metal product forming apparatus 10 can be effectively used, and the base side corner portion 10 can be effectively used.
A boss portion 108 of which the outer surface of 6 has a curved surface shape is integrally formed in a concentric position with a sufficient size and a predetermined cylindrical shape corresponding to the boss portion forming portion 24 of the upper die 16. The intermediate molded body 110 of the pulley can be molded industrially advantageously.

Further, in the method of this example, the outer diameter of the cleavage site 104 is such that the boss portion 10 finally formed is
8 is added to the outer diameter of the boss 108 and a value that is twice the radius of curvature of the curved surface shape of the outer surface of the base side corner portion 106, or immediately before or after that, the metal material Since the cleavage of the processed portion 27 from the outer peripheral portion of 26 is stopped, the entire portion of the processed portion 27 to be cleaved can be more reliably cleaved, and The outer surface of the base side corner portion 106 of the boss portion 108 formed at the cleaving portion 104 is curved in the boss portion forming roller 70 while the volume of the cleaving portion 104 of the processed portion 27 is sufficiently secured. The shaped edge portion 100 can be more surely molded into a predetermined curved surface shape.

Next, FIG. 8 schematically shows a metal product forming apparatus 112 as another specific example of the present invention. In addition, in FIG. 8 and FIGS. 9 to 13 described later, members and parts having the same structure as the first specific example are the same as those in the first specific example in the drawings. The detailed description will be omitted by attaching the reference numerals.

As is clear from FIG. 8, also in the metal product forming apparatus 112 of the present specific example, similarly to the specific example, the upper mold as the first mold is arranged coaxially opposite to each other. A molding die 114 having 16 and a lower die 18 as a second die is arranged and configured on the base 12.

More specifically, as shown in FIG. 9, the lower mold 18 constituting the molding die 114 has the same structure as that of the above-mentioned specific example, and is lower than the upper surface of the lower mold side holder 30. The lower die side pads 32 are coaxially arranged, and are fixed by bolts. Also, the upper mold 1
6 is also configured such that the upper die side pad 22 is coaxially positioned and bolted to the lower surface of the upper die side holder 20 that is coaxially opposed to the lower die 18. There is.

Here, the upper die side pad 22 of the upper die 16 has a substantially cylindrical block shape as a whole, and the upper die side pad 22 and the lower die side pad 32 of the lower die 18 are formed. A boss portion forming portion 116 as a cylindrical portion forming portion is integrally formed in the central portion of the facing surface, and an outer peripheral portion of the facing surface serves as a stopper surface 118. In addition, the boss portion forming portion 116 of the upper die side pad 22 has an outer diameter substantially the same as the inner diameter of the boss portion of the intermediate molded body of the desired pulley with boss, a height higher than that, and the boss portion. It has an outer peripheral surface shape corresponding to the inner surface shape. On the other hand, the stopper surface 118 has an outer diameter sufficiently larger than the outer diameter of the circular protrusion 33 of the lower die side pad 32 of the lower die 18 and smaller than the outer diameter of the lower die side pad 32 by a predetermined dimension. And is positioned above the lower die side pad 32 of the lower die 18 so as to spread in parallel to the upper surface of the lower die side pad 32.

Then, as shown in FIG. 8, the upper mold 16 and the lower mold 18 having such a structure are coaxially arranged on the base 12 in the same state as in the specific example. . That is, on the base 12, the lower mold 18 is driven by the rotation driving of the motor 44 arranged on the base 12.
The upper die 16 is designed to be rotated around the central axis 115 of the (molding die 114), and the upper die 16 is arranged above the base 12 in a fixed position. As the piston rod 62 inside is projected and retracted, the piston rod 62 can be vertically moved together with the upper die moving plate 50.

Thus, in the molding die 114, the piston rod 62 in the upper die moving plate pressing cylinder 64 is used.
The upper mold 16 can be moved toward and away from the lower mold 18 in accordance with the protrusion and the retracting operation of the lower mold 18, and due to the approaching movement, the upper mold 16 is moved to the cylindrical protrusion 33 on the lower mold 18. Metal material 2 placed so as to be fitted
In the processed portion 27, 6 can be concentrically sandwiched between the boss forming portion 116 of the upper die side pad 22 of the upper die 16 and the lower die side pad 32 of the lower die 18. . Then, under such a sandwiched state, the upper mold 16 and the lower mold 18 are driven by the rotational driving of the motor 44.
While sandwiching the metal material 26, it is configured so as to be able to integrally rotate around the central axes 115 thereof, which are the first rotation axes.

Further, the metal product forming apparatus 1 according to this example.
12, the boss forming roller 120 as a cylindrical forming roller is rotatable on the base 12 to which the molding die 114 is attached and is rotatable about the central axis 122 of the boss forming roller 120. It is arranged so that it can move closer and further away.

That is, this boss forming roller 120
Has an approximately cylindrical shape with a low height as a whole, and the outer peripheral surface 124 has a cylindrical surface shape extending in the axial direction with the same diameter. Further, the boss forming roller 12
In No. 0, the lower edge portion is a curved edge portion 126 having a curved surface shape that draws an arc of about ¼ circumference, while the upper end portion thereof is radially outward. Flange portion 128 protruding by a predetermined height and continuously extending in the circumferential direction
Are integrally formed.

Then, such a boss forming roller 12
0 is located on the side of the molding die 14 on the base 12, and is projected and retracted by the roller pressing cylinder 76 toward the center side of the base 12, that is, the arrangement side of the molding die 114. The clamp 78 is removably attached to the clamp 78 attached to the tip of the piston rod 74 in the same manner as in the above-described specific example. The height position of the upper end surface 130 of the boss portion forming roller 120 is located between the lower die pad 32 of the lower die 18 and the metal material 26.
It is arranged so as to be slightly lower than the height position of the stopper surface 118 of the upper die side pad 22 in the upper die 16 in the state where it is clamped.

As a result, the boss forming roller 1
In the No. 20, the central axis 122 can be rotated about the central axis 122 by using the central axis 122 as a second rotational axis parallel to the central axis 115 of the molding die 114 which is the first rotational axis. In addition, the boss portion forming portion 1 of the upper die 16 in the molding die 14 under the die closed state is accompanied by the protrusion and retraction operation of the piston rod 74 by the roller pressure cylinder 76.
It is adapted to be moved toward and away from 16 in a direction perpendicular to the central axis 122. Then, the curved edge portion 126 is sandwiched between the boss portion forming portion 116 and the lower die side pad 32 of the lower die by the movement toward the boss portion forming portion 116. The curved edge portion 126 is brought into contact with the outer peripheral surface of the metal plate 27 so that the metal material 26 can be pressed inward in the radial direction. When the material 26 is pressed, the upper end surface 130, which is located on the side opposite to the side where the curved edge portion 126 is formed, is brought into sliding contact with the stopper surface 118 of the upper die side pad 22 to rotate around the central axis 122. While the rotation of the upper die pad 22 is maintained, the upward movement of the upper die side pad 22 is prevented in the vertical direction. As is apparent from this, in this specific example, the direction perpendicular to the pressing direction against the metal material,
Moreover, the movement preventing means for preventing the movement of the cylindrical portion forming roller in the direction away from the second die is constituted by the stopper surface 118 of the upper die side pad 22.

Thus, the metal product forming apparatus 1 of this example.
In 12, the metal material 26 that is clamped between the boss forming portion 116 of the upper die 16 and the lower die side pad 32 of the lower die 18 and that is rotated integrally with the upper die 16 and the lower die 18, When the processed portion 27 having a circular protrusion shape moves closer to the boss portion forming portion 116 of the boss portion forming roller 120, the outer periphery of the metal material 26 is formed at the curved edge portion 126 of the boss portion forming roller 120. The part can be cleaved (divided) in the protruding direction. In addition, the boss portion forming portion 11 of the boss portion forming roller 120
By further moving toward 6, the cleaved portion 104 of the processed portion 27 becomes boss portion forming roller 120 and boss portion forming portion 1
It is pinched between 16 and the entire cleavage site 104,
The boss portion forming portion 116 is formed into a cylindrical shape corresponding to the cylindrical outer peripheral surface shape, and the outer surface of the base-side corner portion 106 of the cleaving portion 104 is the curved edge portion 12.
6 is formed into a curved surface shape corresponding to the outer surface shape. In this way, the processed portion 27 is cleaved from the outer peripheral portion of the metal material 16, and the cleaved portion 104 is formed into a cylindrical shape, while the upper end surface 130 of the boss portion forming roller 120 is being formed. However, the upper die side pad 32
The stopper surface 118 is slidably contacted with the stopper surface 118 to prevent the boss portion forming roller 120 from being separated from the metal material 26 upward.

In the process of forming the cleavage portion 104 of the processed portion 27 into the cylindrical shape as described above, the outer peripheral surface 124 of the boss portion forming roller 120 and the boss portion forming portion 11 are formed.
Based on the sandwiching force exerted by the outer peripheral surface of No. 6, an action force for extending the cleavage site 104 upward is applied, but here, as described above, the boss formation Since the flange portion 128 is integrally formed on the upper end portion of the roller 120,
The tip of 4 is brought into contact with the lower surface of the flange portion 128 to prevent upward extension of the cleavage site 104,
Instead, the wall thickness of the dehisced portion 104 is increased.

In short, the metal product forming apparatus 1 of this example.
12, the processed portion 27 of the metal material 26 is cleaved from the outer peripheral portion of the metal material 26 by the approach movement of the boss portion forming roller 120 to the boss portion forming portion 116,
Further, the cleaving part 104 is pinched between the boss forming roller 120 and the boss forming part 116, and the whole cleaving part 104 corresponds to the outer peripheral surface shape of the boss forming part 116. The base side corner portion 106 of the cleaving portion 104 is formed into a cylindrical shape, and the boss portion forming roller 120 is formed.
Is formed into a curved surface shape corresponding to the curved edge portion 126 of the metal material 26. When the cleavage portion 104 of the processed portion 27 is formed into a cylindrical shape, the boss forming roller 120 is prevented from moving upwardly away from the metal material 26.

Therefore, in the metal product forming apparatus 112, the boss portion forming roller 120 is used when the to-be-processed portion 27 is torn and when the torn portion of the to-be-processed portion 27 is formed into a cylindrical shape. The reaction force against the pressing force applied to the metal material 26, which is exerted on the curved edge portion 126, pushes up the boss portion forming roller 120, and a portion of the portion of the processed portion 27 to be cleaved is not cleaved. Can be advantageously avoided, so that all the portions of the processed portion 27 to be cleaved can be reliably cleaved, and the cleaved portion of the processed portion 27 can be reliably cleaved. The volume of the portion 104 can be sufficiently secured. And as a result, in the intermediate molded body of the desired pulley with boss,
It is possible to form the boss portion including the cleaving portion 104 with a desired size and shape.

Therefore, when the metal product forming apparatus 112 according to this example is used, the boss portion in which the outer surface of the base side corner portion 106 has a curved surface shape is integrally formed concentrically with a desired size and shape. The intermediate molded body of the bossed pulley can be reliably molded, and thereby,
Thus, a robust intermediate molded body of a boss pulley, which has excellent mechanical strength at the joint portion of the boss portion, and by extension, a boss pulley can be obtained extremely advantageously.

In the metal product forming apparatus 112, the cleaving process for cleaving the processed part 27 from the outer peripheral part of the metal material 26 and the cleaving part 104 of the processed part 27 are formed into a cylindrical shape. Since the rolling process to be performed is performed by one boss portion forming roller 120 at once, the two processes are performed separately by the two rollers. Compared to the device, its structure can be advantageously simplified and yet the two processes can be carried out quickly and smoothly.

Further, in the metal product forming apparatus 112, the boss forming roller 120 is simply attached to the forming die 1.
In order to move the split rolling roller in two directions, a vertical direction and a horizontal direction, since there is only provided a mechanism for moving in only one horizontal direction that approaches and separates from 14. The structure can be simplified as compared with the conventional molding apparatus provided with the mechanism (1).

Further, the metal product forming apparatus 112 of this example.
In the above, the flange portion 128 is provided on the upper end portion of the boss portion forming roller 120, so that when the processed portion 27 is cleaved from the outer peripheral portion of the metal material 26 or when the cleaved portion 104 is formed into a cylindrical shape, The dehiscence portion 104 is the flange portion 1
Since the thickness of the cleaving portion 104 is increased by abutting against the lower surface of the cuff 28, the boss portion provided at the cleaving portion 104 is formed with a sufficiently thick wall thickness. Can be done, by which
The mechanical strength of the joint portion of the boss portion can be further increased, and due to such an increase in the wall thickness of the boss portion, the radius of curvature of the curved surface shape of the outer surface of the base side corner portion 106 in the boss portion can be increased. If you can do it, you can be done. As a result, a more robust intermediate molded body of the bossed pulley can be molded.

In the metal product forming apparatus 112, the outer peripheral portion of the surface of the upper die 16 of the upper die 16 for sandwiching the metal material 26 with the lower die 18 facing the lower die 18 of the upper die side pad 22. The stopper surface 118 is used as the stopper surface 118.
8, the upper end surface of the boss portion forming roller 120 is brought into sliding contact with the boss portion forming roller 120, so that the boss portion forming roller 120 is separated from the metal material 26 under a pressing state of the boss portion forming roller 120. Since it is designed to prevent the boss portion forming roller 120 from being separated from the metal material 26, the structure for preventing the boss portion forming roller 120 from being separated from the metal material 26 is extremely advantageous, without inviting any additional complication of the structure. It can be given.

Thus, when the intended intermediate molded body of the pulley with boss is obtained by using the metal product forming apparatus 112 having such excellent characteristics, the operation is performed, for example, according to the following procedure. Will be advanced.

That is, first, as shown in FIG.
A metal material 26 that gives an intended intermediate molded body of a pulley with a boss is provided in the same manner as in the above-described specific example by using the upper mold 16 and the lower mold 1.
After concentrically sandwiching the upper mold 16 with the lower mold 8, the upper mold 16, the lower mold 18, and the metal material 26 are rotated by driving the motor 44 (not shown) so that the center axis 1 of the molding die 114 is
Rotate around 15 around. Here, again, the metal material 26 has a substantially disc-shaped overall shape, and a circular processed portion 27 is integrally formed at the center of the metal material 26 by cutting or press bending. What
It will be advantageously used.

Next, the roller pressing cylinder 76 is operated to project the piston rod 74, and the clamp 78 is moved toward the molding die 114 side.
As shown in FIG. 1, the boss forming roller 120 is attached to the upper mold 1
6, the curved edge portion 126 of the boss portion forming roller 120 is moved closer to the boss portion forming portion 116 of the boss portion 6 on the outer peripheral surface of the processed portion 27 of the metal material 26 that is integrally rotated with the upper die 16 and the lower die 18. Abut.

At this time, the boss portion forming roller 120 is moved toward the boss portion forming portion 116 while being slidably contacted with the stopper surface 118 of the upper die side pad 22 of the upper die 16 at the upper end surface 130 thereof. Further, due to the contact of the upper end surface 130 with the stopper surface 118 and the contact of the curved edge portion 126 with the metal material 26, it is rotated around the central axis 122 in the direction opposite to the metal material 26. Will be done.

Thereafter, the boss portion forming roller 120 is moved closer to the boss portion forming portion 116 to move the processed portion 27 to the boss portion forming roller 120 as shown in FIG.
The curved edge portion 126 of the metal material 26 is gradually cleaved from the outer peripheral portion of the metal material 26, and the cleaved portion 104 of the processed portion 27 is further separated from the outer peripheral surface 124 of the boss portion forming roller 120 and the boss portion forming portion. The outer surface of the base side corner portion 106 of the cleaving part 104 is formed into a cylindrical shape by being pressed against the outer peripheral surface of the boss portion 116 to form a cylindrical shape corresponding to the outer peripheral surface shape of the boss portion forming portion 116. It is formed into a curved surface shape corresponding to the outer surface shape of the shaped edge portion 126.

Incidentally, such a boss portion forming roller 120
Even when the to-be-processed portion 27 is cleaved or the cleaving portion 104 is formed into a cylindrical shape,
While being rotated around the central axis 122, the stopper surface 118 of the upper die side pad 22 is formed on the upper end surface 130 thereof.
The boss portion forming roller 120 is prevented from moving in a direction in which the boss portion forming roller 120 is separated upward from the metal material 26. Further, at that time, the tip of the cleavage site 104 of the processed portion 27 is brought into contact with the lower surface of the flange portion 128 provided at the upper end of the boss forming roller 120, so that the processed portion 27 is cleaved. The expansion of the cleavage site 104 during the molding of the cleavage site 104 into a cylindrical shape is prevented, and at the same time the wall thickness is increased.

Thus, as shown in FIG. 13, an intermediate molded body 110 of a boss pulley having a thick boss portion 108 integrally and concentrically formed on one surface is obtained. Then, after that, the upper mold 16 is moved upward, and the obtained intermediate molded body 110 of the pulley with the boss is released from the molding die 114.

According to the method of this specific example, the metal material 26 of the processed portion 27 is formed by the boss forming roller 120.
At the time of dehiscence from the outer periphery of the torn portion 1 of the processed portion 27
Since the boss portion forming roller 120 can be advantageously prevented from being separated from the metal material 26 in the upward direction during the molding of 04 into a cylindrical shape, the portion of the portion to be processed 27 to be cleaved is prevented. The whole can be surely dehisced, and the volume of the dehisced portion 104 can be secured sufficiently. In addition to that, the progress of the dehiscence process of the processed material 27 from the metal material 26 and the cylindrical shape. With the molding process to
Since the wall thickness of the cleaving part 104 is increased, the boss portion 108 in which the outer surface of the base side corner portion 106 has a curved surface shape has a sufficient size and wall thickness, and the boss portion is formed. The intermediate molded body 110 of the boss pulley having the predetermined cylindrical shape corresponding to the portion 116 and integrally formed at the concentric position can be molded extremely industrially advantageously.

The specific construction of the present invention has been described above in detail, but this is merely an example, and the present invention is not restricted by the above description.

For example, in the above two specific examples, the first mold and the second mold constituting the molding die are composed of the upper mold 16 and the lower mold 18 which are coaxially positioned in the vertical direction. , The upper mold 16 can be moved toward and away from the lower mold 18, but the first mold and the second mold are coaxial and relatively close to each other, It suffices that the lower mold 18 be movable toward and away from the upper mold 16 as long as the lower mold 18 can be separated from the upper mold 16.
It is also possible to configure the first mold and the second mold by a left mold and a right mold which are coaxially arranged in the left-right direction so as to be relatively close to and away from each other.

Further, in the above two specific examples, the piston rod 6 in the upper die moving plate pressing cylinder 64 by the hydraulic mechanism is used.
The upper mold 1 as the first mold with the protrusion and the retraction operation of 2.
6 was designed to be moved toward and away from the lower mold 18 as the second mold, but for moving the first and second molds relatively toward and away from each other. Of course, the mechanism is not limited to this.

Further, the upper die 16 and the lower die 1 of the molding die 14
The rotation mechanism for integrally rotating 8 and its central axes 29 and 115 is not particularly limited to those shown in the above two specific examples.

Furthermore, in the above two specific examples, the metal material 26 was sandwiched in the thickness direction only between the upper mold 16 and the lower mold 18, but in addition to that, It is also possible to further provide the molding dies 14 and 114 with a structure for holding the metal material 26 in a fixed position. That is, for example, as shown in FIG. 14, on the lower die side pad 32 of the lower die 18, the lower die side pad 3
A clamper 132 that exerts a predetermined clamping force inward in the radial direction of 2 is arranged so as to surround the metal material 26 placed on the lower die side pad 32, and the clamper 132 is provided on the clamper 132. By clamping the outer peripheral surface of the metal material 26 with the upper die 16 and the lower die 18, the metal material 26 is clamped in the radial direction by the clamper 132. However, it is okay. As a result, the metal material 26 becomes the molding die 1
4,114 can be held more reliably.

Further, in the first specific example, the cleaving roller 68 has a generally cylindrical overall shape, and the lower edge portion (lower surface of the lower mold 18 under the condition of facing the molding die 14).
The edge portion located on the side is configured as a rectangular edge portion 94 having a rectangular shape at right angles, but the overall shape of the cleaving roller 68 and the shape of the lower edge portion are not limited to this. For example, the molding die 1 is not limited.
4 to the upper mold 1 under the condition of being opposed to 4
It is also possible to have an overall shape of a truncated cone that gradually decreases in diameter toward the 6 side, and the edge portion on the side of the lower mold 18 has an acute rectangular shape.

Further, the shape of the boss portion forming rollers 70 and 120 as the cylinder portion forming rollers is not limited to those shown in the above two specific examples, and the boss portion forming portion which is the cylinder portion forming portion is not limited. The outer peripheral surfaces 98 and 124 facing the reference numerals 24 and 116 have a cylindrical surface shape, and the edge portion on the second die lower die 18 side is configured as curved edge portions 100 and 126 having a curved surface shape. Therefore, any shape can be advantageously adopted.

Furthermore, the boss forming roller 70,
If the shape of the curved edge portions 100 and 126 of 120 is also a curved surface shape that is convex outward,
It goes without saying that the examples shown in the above two specific examples are by no means limited.

In the two specific examples, the upper ends of the cleaving roller 68 and the boss forming roller 120 are
A flange that abuts on the tip of the cleaving part 104 of the processed part 27 and increases the wall thickness of the cleaved part 104 as the cleaving process of the processed part 27 or the forming process into a cylindrical shape progresses. Although the portions 92 and 128 are integrally formed, the flange portions 92 and 128 may be omitted without any problem.

Further, in the above two specific examples, the base 12
A clamp 78 is fixed to the tip portion of the piston rod 74 in the roller pressing cylinder 76 arranged above,
This piston rod 74 is the central shaft 115 of the molding die 14.
The protrusion roller 68 and the boss portion forming rollers 70 and 120, which are the cylinder portion forming rollers, attached to the clamp 78 approach the molding dies 14 and 114 by being projected and retracted in a direction perpendicular to It was designed to be moved apart, but such a cleaving roller 68
The moving mechanism of the boss portion forming rollers 70 and 120,
It is not limited to this.

In the first embodiment, the two roller pressing cylinder mounting portions 72 integrally formed on the base 12,
One clamp 78, one roller pressing cylinder 76, and one piston rod 74 are provided for each 72, and the moving mechanism of the cleaving roller 68 and the moving mechanism of the boss forming roller 70 are separately provided. Had been formed,
By providing only one set of such moving mechanism and selectively attaching the cleaving roller 68 and the boss portion forming roller 70 to the clamp 78 of the one set of moving mechanism, The moving mechanism of the cleaving roller 68 and the moving mechanism of the boss forming roller 70 may be combined,
Furthermore, it is of course possible to provide three or more sets of such moving mechanisms.

Furthermore, in the first specific example, the cleaving roller 68 and the boss forming roller 70 as the cylindrical part forming roller are formed as separate members. One cleaving rolling roller having the same structure as the roller 68 and the lower half having the same structure as the boss portion forming roller 70 is used, and the upper half thereof is cleaving roller 68.
And the lower half as the boss forming roller 70,
You may make it function respectively. Of course, in this case, in addition to moving the split rolling roller toward and away from the molding die 14, the molding die 1 is also moved.
It is necessary to provide a moving mechanism capable of moving in the axial direction of 4 as well.

Further, in the second specific example, only one boss portion forming roller 120 as the cylindrical portion forming roller is arranged on the base 12, but the boss portion forming roller 120 is used as a base. A plurality of units may be arranged on the table 12.

Further, in the second specific example, the upper mold 16
The movement preventing means was constituted by the stopper surface 118 formed of the outer peripheral portion of the surface of the upper die side pad 22 facing the lower die 18 in FIG. It is also possible to configure it.

In addition, in the above two specific examples, the present invention is applied to a metal product forming apparatus used for forming an intermediate formed body of a pulley with a boss and a forming method of the intermediate formed body. Although a specific example is shown, the present invention is used in various other applications, and for any of a molding apparatus for a metal product and a molding method of such a metal product in which a cylindrical portion is concentrically integrally formed. Of course, it can be applied to advantage.

Although not listed one by one, the present invention
The present invention can be carried out in a mode in which various changes, modifications, improvements, etc. are added based on the knowledge of those skilled in the art, and in addition, as long as such a mode does not depart from the spirit of the present invention, It should be understood that it is included within the scope of the invention.

[0111]

As is apparent from the above description, in the metal product forming apparatus according to the present invention in which the cylindrical portions are concentrically formed integrally, the outer surface of the corner portion on the base side has a curved surface shape. It is possible to reliably form a metal product in which the cylindrical portion is concentrically integrally formed with a desired size and shape, and as a result, it is possible to obtain a robust and excellent mechanical strength at the joint portion of the cylindrical portion. A metal molded product can be obtained extremely advantageously.

Further, according to the method for forming a metal product in which the cylindrical portions are concentrically and integrally formed according to the present invention, the target metal product can be formed extremely advantageously industrially.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional explanatory view schematically showing an example of a metal product forming apparatus according to the present invention, in which the right half shows a state in which a metal material is set in a state where a forming die is opened. The left half shows the state where the molding die is closed and the cylindrical portion is formed by the cylindrical portion forming roller.

FIG. 2 is an explanatory vertical cross-sectional view showing a molding die that constitutes the apparatus for molding the metal product shown in FIG.

FIG. 3 is an explanatory view showing an example of one step in forming a metal product using the forming apparatus shown in FIG. 1 according to the method of the present invention, in a mold open state in a mold , Shows a state in which a metal material is set.

FIG. 4 is an explanatory view showing another example of steps in forming a metal product using the forming apparatus shown in FIG. It shows a state in which a metal material is sandwiched between them.

FIG. 5 is an explanatory view showing still another example of a step of forming a metal product by using the forming apparatus shown in FIG. 1 according to the method of the present invention. It shows a state in which the lower die is rotated together with the lower die and the portion to be processed of the metal material is pressed by the cleavage roller to cause the cleavage.

FIG. 6 is an explanatory view showing another example of steps in forming a metal product by using the forming apparatus shown in FIG. 1 according to the method of the present invention, showing a cleavage site in a processed portion of a metal material. It shows a state in which the boss portion forming roller is pressed to form the entire cleaved portion into a cylindrical shape, and the outer surface of the base side corner portion of the cleaved portion is formed into a curved surface shape.

FIG. 7 is an explanatory view showing still another example of the step of molding a metal product using the molding apparatus shown in FIG. 1 according to the method of the present invention, in which the molded metal product is released from the mold. It shows the state.

FIG. 8 is a vertical cross-sectional explanatory view schematically showing another example of the apparatus for molding a metal product according to the present invention, in which the right half is in a state where the metal material is set while the molding die is opened. Further, the left half shows a state in which the molding die is closed and the cylindrical portion is formed by the cylindrical portion forming roller.

9 is a vertical cross-sectional explanatory view showing a molding die that constitutes the metal product molding apparatus shown in FIG.

FIG. 10 is an explanatory view showing an example of one step in forming a metal product using the forming apparatus shown in FIG. 8 according to the method of the present invention, and showing a process between an upper die and a lower die of a molding die. 2 shows a state in which the upper die and the lower die are integrally rotated while sandwiching the metal material.

FIG. 11 is an explanatory view showing another example of steps in forming a metal product using the forming apparatus shown in FIG. 8 according to the method of the present invention, in which the boss forming roller is moved closer to the forming die. The curved edge portion of the boss portion forming roller is brought into contact with the outer peripheral surface of the processed portion of the metal material.

FIG. 12 is an explanatory view showing still another example of the step of forming a metal product using the forming apparatus shown in FIG. 8 according to the method of the present invention, which is a processed part of a metal material that can be integrally rotated. While cleaving the metal material from the outer peripheral portion at the curved edge portion of the boss portion forming roller, the cleaved portion of the metal material is sandwiched between the boss portion forming roller and the upper die boss portion forming portion. The figure shows a state in which the entire cleavage site is formed into a cylindrical shape by pressing and the outer surface of the base side corner of the cleavage site is formed into a curved surface shape.

FIG. 13 is an explanatory view showing another example of the steps of molding a metal product using the molding apparatus shown in FIG. 8 according to the method of the present invention, in which the molded metal product is released from the mold. Is shown.

FIG. 14 is a vertical cross-sectional explanatory view showing another example of the molding die that constitutes the metal product molding apparatus according to the present invention.

[Explanation of symbols]

10,112 Metal product molding device 14,114 Mold 16 Upper mold 18 Lower mold 24,116 Boss part forming part 26 Metal material 27 Worked part 68 Cleaving roller 70,120 Boss part forming roller 94 Square edge part 98, 124 outer peripheral surface 100, 126
Curved edge portion 104 Cleavage portion 106 Base side corner portion 108 Boss portion 110 Intermediate molded body 118 Stopper surface 128 Flange portion 130 Upper end surface

Continuation of front page (56) Reference JP-A-9-122816 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B21H 1/00 B21H 1/04 B21D 53/26

Claims (8)

(57) [Claims] 1. A molding apparatus for molding a metal product in which a cylindrical portion is concentrically and integrally formed, and an outer surface of a corner portion on the base side of the cylindrical portion has a curved surface shape. A first die having a cylindrical portion forming portion having an outer peripheral surface corresponding to the inner peripheral surface shape of the cylindrical portion, and coaxially and relatively approaching the cylindrical portion forming portion of the first die. A metal having a second die arranged so as to be separable, and having a circular protrusion-shaped processed portion at a central portion, which has a diameter larger than the outer diameter of the cylindrical portion forming portion of the first die. A metal material for giving a product is sandwiched between the cylindrical portion forming portion and the second die so as to be concentrically located with respect to the cylindrical portion forming portion and the second die in the processed portion. At the same time, the cylindrical portion forming portion and the second mold are configured so that they can rotate integrally with their axes as the first rotation axis. And a molding die that is rotatable about a second rotation axis that is parallel to the first rotation axis, and that moves toward and away from the molding die in a direction perpendicular to the first rotation axis. The roller is arranged so that the edge portion located on the side of the second mold has a right-angled or acute-angled rectangular shape, and the edge portion of the rectangular shape is The square-shaped edge portion is formed by pressing the metal material inward in the radial direction in a state of abutting the outer peripheral surface of the processed portion of the metal material that is integrally rotated about one rotation axis. At, a cleaving roller that cleaves the processed portion from the outer peripheral portion of the metal material in the protruding direction thereof, and rotatable about a third rotation axis parallel to the first rotation axis, and Moves toward and away from the molding die in a direction perpendicular to the first rotation axis While being arranged so as to obtain, the outer peripheral surface facing the outer peripheral surface of the cylindrical portion forming portion of the first die has a cylindrical surface shape, and the edge portion on the second die side has a curved surface shape. In the state in which the edge portion of the curved surface shape is brought into contact with the corner portion on the base side of the cleaved portion of the processed portion, By pressing the open part inward in the radial direction of the metal material and pinching the open part with the cylindrical part forming part, the cleaving part is formed into a cylindrical shape corresponding to the cylindrical part forming part. And a cylindrical portion forming roller that forms the cylindrical portion by molding the outer surface of the base side corner portion of the cleaving portion into a curved surface shape corresponding to the edge portion of the curved surface shape. And a molding device for metal products in which a cylindrical portion is concentrically formed integrally. . 2. A molding apparatus for molding a metal product in which a cylindrical portion is concentrically and integrally formed, and an outer surface of a corner portion on the base side of the cylindrical portion has a curved surface shape. A first die having a cylindrical portion forming portion having an outer peripheral surface corresponding to the inner peripheral surface shape of the cylindrical portion, and coaxially and relatively approaching the cylindrical portion forming portion of the first die. A metal having a second die arranged so as to be separable, and having a circular protrusion-shaped processed portion at a central portion, which has a diameter larger than the outer diameter of the cylindrical portion forming portion of the first die. A metal material for giving a product is sandwiched between the cylindrical portion forming portion and the second die so as to be concentrically located with respect to the cylindrical portion forming portion and the second die in the processed portion. At the same time, the cylindrical portion forming portion and the second mold are configured so that they can rotate integrally with their axes as the first rotation axis. And a molding die capable of rotating around a second rotation axis parallel to the first rotation axis, and moving toward and away from the molding die in a direction perpendicular to the first rotation axis. While it can be placed as much as possible,
The outer peripheral surface of the first mold facing the outer peripheral surface of the cylindrical portion forming portion has a cylindrical surface shape, and the edge portion located on the second mold side has a curved surface shape. The metal material in the radial direction with the curved edge portion being in contact with the outer peripheral surface of the processed portion of the metal material that is integrally rotated around the first rotation axis. By pressing inward,
At the edge portion of the curved surface shape, the processed portion is cleaved from the outer peripheral portion of the metal material in the protruding direction, while the cleaved portion of the processed portion is formed into the cylindrical portion forming portion. The cleavage site is formed into a cylindrical shape corresponding to the cylindrical portion forming section by pinching between and, and the outer surface of the base side corner of the cleavage site corresponds to the edge portion of the curved surface shape. A cylindrical portion forming roller that is formed into a curved surface shape and that forms the cylindrical portion; and, in the cylindrical portion forming roller that is pressed inward in the radial direction with respect to the metal material of the cylindrical portion forming roller, In a direction perpendicular to the pressing direction against the metal material while slidingly contacting the end surface on the side opposite to the second mold side and allowing the rotation of the cylindrical portion forming roller around the second rotation axis. , And prevent movement in a direction away from the second mold A device for forming a metal product in which a cylindrical portion is concentrically and integrally formed. 3. The cylindrical portion forming portion is formed so as to project from a central portion of a surface of the first die facing the second die, while the movement preventing means includes the first die. The outer periphery of the surface of the mold facing the second mold,
The molding according to claim 2, wherein the cylindrical portion forming roller is configured to be slidably contacted with an outer peripheral portion of the facing surface under a state of being pressed inward in the radial direction against the metal material. apparatus. 4. The cylindrical portion forming roller is brought into contact with the tip of the cleaved portion of the processed portion when the cleavage of the processed portion from the outer peripheral portion of the metal material progresses, 3. The structure according to claim 2, further comprising a thickness increasing means for increasing the thickness of the dehiscence site by preventing extension of the dehiscence site accompanying the progress of dehiscence. The molding apparatus according to item 3. 5. The thickness increasing means is composed of a flange portion provided so as to project radially outward with respect to the outer peripheral surface of the cylindrical portion forming roller and continuously extend in the circumferential direction. The molding apparatus according to claim 4, wherein: 6. A method for forming a metal product in which a cylindrical portion is concentrically and integrally formed, and an outer surface of a corner portion on the base side of the cylindrical portion has a curved surface shape. A first die having a cylindrical portion forming portion having an outer peripheral surface corresponding to the inner peripheral surface shape, and a second die arranged coaxially with the cylindrical portion forming portion and capable of relatively approaching and separating from each other. Using a molding die configured such that the cylindrical part forming part and the second mold can be integrally rotated with the axis of the second mold as the first rotation axis. A metal material giving a metal product having a circular protrusion-shaped processed portion having a diameter larger than the outer diameter of the metal material in the processed portion, with respect to the cylindrical portion forming portion and the second mold. So as to be positioned concentrically with each other, while sandwiching between the cylindrical portion forming portion and the second mold, the cylindrical portion forming portion A step of integrally rotating the second mold with the first rotation axis, and under the rotating state of the metal material due to the integral rotation around the first rotation axis, on the side of the second mold. In a state in which the cleaving roller configured so that the positioned edge portion has a right-angled or acute-angled rectangular shape is brought into contact with the outer peripheral portion of the processed portion of the metal material at the square-shaped edge portion. , While rotating around a second rotation axis parallel to the first rotation axis, and pressing inward in the radial direction against the metal material, the processed portion from the outer peripheral portion of the metal material. The step of cleaving in the protruding direction, and the outer peripheral surface of the metal material facing the outer peripheral surface of the cylindrical portion forming portion of the first mold under an integrally rotating state around the first rotation axis. It has a cylindrical surface shape and the side of the second mold A cylindrical portion forming roller having an edge portion configured to have a curved surface shape, and a base portion of a cleaving portion of the processed portion cleaved by the cleaving roller at the curved surface edge portion. While being in contact with the side corner portion, while being rotated about the third rotation axis parallel to the first rotation axis, pressed against the cleavage site inward in the radial direction of the metal material. The cleaving part is clamped between the cylindrical part forming roller and the cylindrical part forming part to form the cleaving part into a cylindrical shape corresponding to the cylindrical part forming part, and the cleaving part is formed. A step of forming an outer surface of a corner portion on the base side of the portion into a curved surface shape corresponding to the edge portion of the curved surface shape to form the cylindrical portion, wherein the cylindrical portion is concentrically formed. A method for forming a metal product integrally formed. 7. A cylinder of the metal product to be formed, wherein the outer diameter of the base side of the cleaved part of the processed part is increased by the progress of the process of cleaving the processed part from the metal material. The cleaving process is terminated when the dimension of the outer diameter of the portion is twice the radius of curvature of the curved surface of the base of the cylindrical portion. The molding method according to claim 6. 8. A method for forming a metal product in which a cylindrical portion is concentrically and integrally formed, and an outer surface of a corner portion on the base side of the cylindrical portion has a curved surface shape. The metal material for providing the metal product, wherein the cylindrical portion forming portion having an outer peripheral surface corresponding to the inner peripheral surface shape is provided with a cylindrical processed portion having a diameter larger than the outer diameter of the cylindrical portion forming member. A step of arranging them in coaxial contact with each other, and a cylindrical portion having a cylindrical outer peripheral surface corresponding to the outer peripheral surface shape of the cylindrical portion, and one of the edge portions of the outer peripheral surface having a curved surface shape. Using the forming roller, the edge portion of the curved surface shape is brought into contact with the outer peripheral surface of the processed portion of the metal material rotated around the central axis, and the side on which the edge portion of the curved surface shape is formed is Rotate the opposite end face around the central axis of the cylinder forming roller. Although tolerated, along the central axis, while the movement in the opposite direction by sliding contact with the movement preventing means for preventing the formation side of the edge portion,
The cylindrical portion forming roller and the metal material are pressed against the processed portion of the metal material by rotating the cylindrical portion forming roller and the metal material relative to each other about the central axis or relatively moving in the circumferential direction. The to-be-processed part is cleaved from the base-corresponding part of the metal material corresponding to the base part of the metal product, and the cleaved part of the to-be-processed part is sandwiched between the cylindrical part forming member. By pressing, the cleaved portion is formed into a cylindrical shape corresponding to the cylindrical portion forming member, and the outer surface of the base side corner portion of the cleaved portion is formed into a curved surface shape corresponding to the edge portion of the curved surface shape. And a step of forming the cylindrical portion, the method for forming a metal product in which the cylindrical portions are concentrically formed integrally with each other.