JP2015120191A - Press device and roller manufacturing method using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a roller with uniform thickness to be manufactured in manufacturing various rollers by impact press.SOLUTION: The press device, provided with a lower die 2, a slag 4 arranged in a cavity of the lower die and a punch 8 a tip part of which is inserted into the cavity by descending, presses impulsively the slag arranged in the cavity using the punch and plastically deforms the slag along an outer periphery of the punch to manufacture a roller. On an upper face of the slag is formed a recessed part 5 having slag-side taper portions continuously arranged at a slag-side bottom part 6 and a peripheral edge of the slag-side bottom part. On a tip of the punch is formed a pressing part 10 that has a punch-side taper part 12 continuously arranged at a punch-side bottom portion 11 and a peripheral edge part of the punch-side bottom part and can be inserted into the recessed part. A rising angle of the slag-side taper part relative to a face of the slag-side bottom part is set larger than a rising angle of the punch-side taper part relative to a face of the punch-side bottom part.

Description

  The present invention relates to a press device and a method of manufacturing a roller using the same, and more specifically, a press device for manufacturing various bottomed cylindrical rollers by impact press, and a bottomed cylindrical roller using the same. It relates to a method of manufacturing.

  As is well known, in a printer or a copier, a metal cylindrical roller is used as a photoreceptor. In addition, in various products, metal cylindrical rollers are used.

  In the past, this roller was generally manufactured by cutting a round material or by extruding aluminum. However, in recent years, for the purpose of cost reduction, the roller or the original roller is produced by the impact press method. Attempts have been made to produce (hereinafter referred to as “rollers”).

  Here, a method of manufacturing a roller by the impact press method will be described with reference to the drawings. FIGS. 7 and 8 are diagrams for explaining a press device for manufacturing a roller by the impact press method. is there. And the press apparatus for manufacturing a roller with an impact press has a lower mold | type and a punch. That is, in the figure, 41 is a lower mold, and this lower mold 41 has a cavity 42, and a slag 43 as a material is disposed in the cavity 42.

  In the figure, reference numeral 44 denotes a punch. The punch 44 is disposed so as to be relatively movable with respect to the lower die, and is lowered with respect to the lower die so that the tip portion can be inserted into the cavity 42. .

  When a roller is manufactured by the impact press method using the press apparatus configured as described above, first, a slag 43 that is a lump of metal such as aluminum as a material of the roller is placed in the cavity 42. To place. Then, in this state, the punch 44 is lowered, and the tip portion of the punch 44 is inserted into the cavity 42, thereby pressing the slag 43 in an impact manner. Then, as shown in FIG. 8, the slag 43 in the cavity 42 is plastically deformed upward along the outer periphery of the punch 44, thereby forming the slag into the shape of a roller.

  Therefore, when the roller is manufactured by this impact press method, the number of molds is reduced and the material loss is reduced as compared with the case of manufacturing by extrusion molding as described above, thereby suppressing the manufacturing cost. There is an advantage that you can.

Japanese Patent Laid-Open No. 06-285579 JP 2000-10318 A JP 2000-10306 A Japanese National Patent Publication No. 10-508254 Japanese Patent Laid-Open No. 10-24343 Japanese Patent Laid-Open No. 6269891

  However, it has been pointed out that it is difficult to make the wall thickness uniform when the roller is manufactured by the impact press method described above. That is, when a roller is manufactured by the impact press method described above, the slag is plastically deformed upward along the outer periphery of the punch due to the impact of the punch, so that the thickness of the manufactured roller is uniform. In this case, it is necessary to place the slag on the central portion in the cavity so that the punch presses the central portion of the slag.

  However, in the impact press, in order to smoothly put the slag into the cavity, the outer diameter of the slag is made smaller than the inner diameter of the cavity. Therefore, when the slag is placed in the cavity, the slag There will be a gap between the periphery and the inner wall of the cavity.

  Therefore, when the slag is put in the cavity, the slag cannot be arranged in the central portion of the cavity, and the slag may be arranged in a state shifted laterally. The slag will deviate from the center of the cavity.

  Then, when the punch is lowered and the tip portion of the punch is inserted into the cavity and the slag is pressed, the punch cannot press the center portion of the slag, and the thickness of the roller in the circumferential direction is increased. The problem that it cannot be made uniform occurs.

  Therefore, the present invention is a method of manufacturing various rollers by impact press, even when the slag is displaced from the central portion of the cavity, the slag is disposed in the central portion of the cavity by correcting the displacement, Accordingly, an object of the present invention is to provide a press device that can manufacture a roller having a uniform thickness and a method for manufacturing a roller using the press device.

The press device of the present invention is
A lower mold having a cavity;
A slag disposed as a material in the cavity;
A punch that is disposed so as to be relatively movable with respect to the lower mold and is lowered to insert a tip portion into the cavity;
With the slag disposed in the cavity, the punch is lowered and the tip of the punch is inserted into the cavity, so that the slag is shockedly pressed by the punch, and the slag is A press device for producing various bottomed cylindrical rollers by plastically deforming along the outer periphery of the punch,
On the upper surface of the slag,
A concave portion having a slag side bottom portion and a slag side tapered portion continuously provided obliquely upward on the outer peripheral side from the peripheral edge portion of the slag side bottom portion;
At the tip of the punch that is inserted into the cavity and impacts the slug,
A pressing part is formed that has a punch side bottom part and a punch side taper part continuously provided from the peripheral part of the punch side bottom part toward the outer peripheral side obliquely upward, and can be inserted into the recess,
The rising angle of the slag side taper portion with respect to the surface of the slag side bottom portion is made larger than the rising angle of the punch side taper portion with respect to the surface of the punch side bottom portion.

And the manufacturing method of the roller of the present invention for manufacturing a bottomed cylindrical roller using the press device of the present invention configured as described above,
Placing the slug in the cavity;
Lowering the punch and inserting the tip of the punch into the cavity;
While adjusting the position of the slag by bringing the punch-side tapered portion of the punch into contact with the slag-side tapered portion, the punch presses the slag with impact, and the slag is plasticized along the outer periphery of the punch. It is characterized by producing a roller by deforming.

  In the press device of the present invention, a lower mold having a cavity, a slag disposed in the cavity as a material, a tip portion is inserted into the cavity, and the slag is impacted and impacted. In a press apparatus having a punch that plastically deforms slag along the outer periphery of the punch to form a bottomed cylindrical roller, on the upper surface of the slag, on the slag side bottom, and on the outer peripheral side obliquely upward from the periphery of the slag side bottom A punch having a slag taper portion continuous toward the punch is formed, and at the tip of the punch, the punch is continuously extended obliquely upward on the outer peripheral side from the peripheral portion of the punch side bottom. A pressing portion that can be inserted into the recess, and the rising angle of the slag side taper portion with respect to the surface of the slag side bottom portion is set against the surface of the punch side bottom portion. When the slag is placed in the cavity and the punch is lowered and the tip of the punch is inserted into the cavity, the slag of the slag is increased. Position adjustment is possible.

  That is, as described above, in the present invention, since the rising angle of the slag side taper portion with respect to the surface of the slag side bottom portion is larger than the rising angle of the punch side taper portion with respect to the surface of the punch side bottom portion, When the punch tip portion is inserted into the cavity after being lowered, the upper end portion of the punch side taper portion comes into contact with the slag side taper portion as shown in FIG.

  At this time, if the slag is accurately arranged in the central portion of the cavity, the entire area of the punch-side tapered portion abuts on the slag-side tapered portion, but the slag is arranged at a position shifted in the cavity. In this case, as shown in FIG. 6, the entire area of the punch-side taper portion does not contact the slag-side taper portion. Then, in the process of lowering the punch, the slag is pushed laterally by the punch at the contact point with the punch, and thereby moves in the pressing direction. This lateral pressing continues until the slag moves to the central portion in the cavity and the entire edge portion of the punch comes into contact with the inner wall of the slag side taper portion, and the slag is in the central portion in the cavity. After being placed on the slag, the pressing by the punch is directed only to the lower side of the slag, so that the slag is impacted by the punch and plastically deformed along the outer periphery of the punch to produce a roller. Become. That is, in the press device of the present invention, even when the slag is not arranged in the central portion of the cavity, the slag can be moved to the central portion of the cavity by adjusting the position of the slag, It is possible to produce a roller with uniform thickness.

It is a figure for demonstrating the structure of the Example of the press apparatus of this invention. It is a figure for demonstrating the process in which a roller is manufactured using the Example of the press apparatus of this invention. It is a figure for demonstrating the process in which a roller is manufactured using the Example of the press apparatus of this invention. It is a figure for demonstrating the process in which a roller is manufactured using the Example of the press apparatus of this invention. It is a figure for demonstrating the process in which a roller is manufactured using the Example of the press apparatus of this invention. It is a figure for demonstrating the effect | action of the Example of the press apparatus of this invention. It is a figure for demonstrating the method of a general impact press. It is a figure for demonstrating the method of a general impact press.

  The press apparatus of the present invention has a lower mold having a cavity and a slag as a material, and the slag is disposed in the cavity. Further, the press device of the present invention has a punch, and this punch is disposed so as to be relatively movable with respect to the lower die, and the tip portion is inserted into the cavity by descending, so that the cavity It is used to produce a bottomed cylindrical roller by impacting the inner slag and thereby plastically deforming the slag along the outer periphery of the punch.

  And the recessed part is formed in the upper surface of slag, and this recessed part is a slag side bottom part in this invention, and the slag side taper part connected in a diagonally upward direction on the outer peripheral side from the peripheral part of this slag side bottom part It is comprised.

  In addition, a pressing portion that can be inserted into the concave portion is formed at the tip portion of the punch. In the present invention, the pressing portion is formed on the punch side bottom portion and obliquely above the outer peripheral side from the peripheral edge portion of the punch side bottom portion. It has the punch side taper part continuously provided toward the direction. And in this invention, the taper angle of the punch side taper part with respect to a punch side bottom part is made smaller than the taper angle of the slag side taper part with respect to a slag side bottom part.

  And when manufacturing various bottomed cylindrical rollers using the press apparatus of the present invention configured as above, first, the slag is arranged in the cavity, and then the punch is lowered, Insert the tip of the punch into the cavity. Then, the upper end portion of the punch side taper portion in the punch is brought into contact with the inner peripheral side upper portion of the slag side taper portion, and when the slag is not disposed in the central portion of the cavity, while adjusting the position of the slag, A bottomed cylindrical roller is manufactured by impacting the slag with a punch and thereby plastically deforming the slag along the outer periphery of the punch.

  An embodiment of the press apparatus of the present invention will be described. FIG. 1 is a cross-sectional view showing the press apparatus of the present embodiment. In the figure, 1 is the press apparatus of the present embodiment. And the press apparatus of a present Example has the lower mold | die which has a cavity, the slag as a material, and the punch for pressing the slag arrange | positioned in a cavity impactively. That is, in the figure, reference numeral 2 denotes a lower mold. In the present embodiment, the lower mold 2 has a cavity 3 for disposing slag as a material, and this cavity 3 is the press of the present embodiment. A cylindrical hole having the same inner diameter as the outer diameter of the roller manufactured by the apparatus 1 is used. In addition, the roller manufactured with the press apparatus 1 of a present Example is not limited to the roller as a finished product, The prototype of the roller of the previous stage which manufactures the roller as a finished product is also contained. In addition, although there are cylindrical rollers manufactured by cutting the bottom portion of the bottomed cylindrical roller as a finished product, the roller manufactured by the press device 1 of the present embodiment has a bottom portion. Also included is a prototype of a bottomed cylindrical roller before cutting to produce a cylindrical roller. Accordingly, in the following description, the term “roller” refers to a roller manufactured by the press device 1 of the present embodiment or a roller prototype, or a bottomed cylindrical roller before a cylindrical roller is manufactured by cutting the bottom portion. Say the prototype.

  Next, the punch will be described. In the figure, reference numeral 8 denotes the punch. In the present embodiment, the punch 8 is disposed so as to be relatively movable with respect to the lower mold 2, and is lowered to lower the tip portion. It can be inserted into the cavity 3. Then, with the slag 4 disposed in the cavity 3, the tip portion of the punch 8 is inserted into the cavity 3, and the slag 4 in the cavity 3 is shockedly pressed, thereby A roller is manufactured by plastically deforming the slag 4 along the outer periphery of the punch 8.

  Therefore, in the present embodiment, the punch 8 has a cylindrical outer shape with an outer diameter similar to the inner diameter of the roller manufactured by the press device 1 of the present embodiment, and the outer shape of the tip at the tip portion is that of the roller to be manufactured. The shape and dimensions are the same as the bottom inner wall. Therefore, in this embodiment, when the tip portion of the punch is inserted into the cavity 3, a gap between the outer periphery of the punch tip portion 9 and the inner wall of the cavity 3 is formed in the press device 1 of this embodiment. It becomes the thickness of the roller to manufacture.

  And in the press apparatus 1 of a present Example, the front-end | tip of the punch made into the outer shape of the same shape dimension as the inner wall of the front-end | tip part of the roller manufactured is made into a press part. That is, in the drawing, 9 is a tip portion of the punch 8 inserted into the cavity 3, and 10 is a pressing portion formed at the tip of the tip portion 9.

  Here, the pressing portion 10 will be described. In this embodiment, the pressing portion 10 has a punch-side bottom portion 11, and the outer periphery of the punch-side bottom portion 11 extends from the peripheral portion of the punch-side bottom portion 11 to the outer peripheral side. The punch side taper portion 12 is formed so as to extend obliquely upward, and the upper end of the punch side taper portion 12 is connected to the lower end of the tip end portion 9 of the punch. Therefore, the press apparatus in the present embodiment is a press apparatus that manufactures a roller having a bottom portion and a tapered portion formed on the bottom portion from the peripheral edge portion of the bottom portion toward an oblique upper side on the outer peripheral side.

  And the punch side bottom part 11 is made into the same shape dimension as the outer diameter of the bottom part of the roller to manufacture, and the punch side taper part 12 has the same inclination angle as the taper part of the roller to manufacture, and the periphery of the said punch side bottom part 11 It is connected to the department.

  Next, the slag disposed in the cavity 3 as a material will be described. In FIG. 1, 4 is a slag, and in this embodiment, the slag 4 has a cylindrical shape as a whole and is formed of aluminum. . In this embodiment, the slag 4 has an outer diameter slightly smaller than the inner diameter of the cavity 3 and larger than the outer diameter of the pressing portion 10 in the punch 8. The outer diameter is such that the clearance between the side wall of the slag 4 and the inner wall of the cavity 3 is about 0.1 to 0.2 mm when arranged in the central portion. Making it easy.

  In this embodiment, a concave portion is formed on the upper surface of the slag 4. That is, in the figure, 5 is a recess, and in this embodiment, the recess 5 has a slag side bottom 6 having the same shape and dimension as the outer diameter of the bottom of the roller manufactured by the press device of this embodiment, A slag side taper portion 7 having a predetermined angle is formed on the peripheral edge portion of the slag side bottom portion 6 in a diagonally upward direction on the outer peripheral side. In the present embodiment, the inner diameter of the upper end portion of the slag side taper portion 7 is larger than the outer diameter of the tip end portion 9 of the punch. Is lowered so that it can be inserted into the recess 5.

  Here, the slag side taper portion 7 will be described. In this embodiment, the angle at which the slag side taper portion 7 rises with respect to the surface of the slag side bottom portion 6 is the punch side taper portion with respect to the surface of the punch side bottom portion 11. The angle is larger than 11 rising angle. That is, the angle formed by the surface of the slag side bottom portion 6 and the surface of the slag side taper portion 7 includes an angle that exceeds 90 degrees and an angle that does not exceed 90 degrees. When the angle not exceeding is compared, the angle at which the slag side taper portion 7 rises with respect to the surface of the slag side bottom portion 6 is greater than the angle at which the punch side taper portion 11 rises with respect to the surface of the punch side bottom portion 11. Even bigger.

  Therefore, in the press device 1 of the present embodiment, both the slag side bottom portion 6 and the punch side bottom portion 11 have the same shape and dimensions as the outer diameter of the bottom portion of the roller manufactured by the press device of the present embodiment. Since the taper portions 7 and 12 are connected to the peripheral portions of the bottom portions 6 and 11, when the punch 8 is lowered and the pressing portion 10 is inserted into the recess 5, the punch-side taper portion 12, More specifically, the edge portion 13 at the boundary between the punch-side taper portion 12 and the tip end portion 9 of the punch abuts against the inner wall of the slag-side taper portion 12, and thereafter, the insertion of the punch 8 into the cavity 3 is continued. Then, when the edge portion 13 pushes the slag side taper portion 12 open to the outer peripheral side and further continues to be inserted, the punch side bottom portion 11 abuts against the slag side bottom portion 6 and the slag 4 is moved into the cavity 3. Bottom continue to impulsively pressed to the vicinity, thereby, the slag 4 by plastically deformed along the outer circumference of the punch 8, so that the slag 4 will be molded to the shape of the roller. FIGS. 3 to 5 show this state. That is, FIG. 3 shows a state in which the edge portion 13 is in contact with the inner wall of the slag side tapered portion 12, and FIG. 4 shows that the edge portion 13 pushes the slag side tapered portion 12 outward. FIG. 5 shows a state in which the slag 4 is plastically deformed along the outer periphery of the punch 8 and formed into a roller shape.

  Thus, in the press apparatus 1 of the present embodiment, the angle at which the slag side tapered portion 7 rises with respect to the surface of the slag side bottom portion 6 is made larger than the rising angle of the punch side tapered portion 11 with respect to the surface of the punch side bottom portion 11. Thus, when the punch 8 is lowered and the pressing portion 10 is inserted into the recess 5, before the punch-side bottom portion 11 comes into contact with the slag-side bottom portion 6, first, the punch-side taper portion 12 and the tip end portion of the punch Since the edge portion 13 at the border of 9 abuts against the inner wall of the slag side taper portion 12, the position of the slag 4 can be adjusted when the slag 4 is not disposed at the central portion in the cavity 3. .

  Explaining this relationship, when the slag 4 is accurately arranged in the central portion of the cavity 3, the entire area of the edge portion 13 is formed on the inner wall of the slag side taper portion 7 as shown in FIG. 3. Abut.

  However, when the slag 4 is displaced in the cavity 3, the entire edge portion 13 does not contact the inner wall of the slag side taper 7 as shown in FIG. 6.

  Therefore, when the punch 8 is lowered in the state shown in FIG. 6, the slag 4 is pushed laterally by the punch 8 at the contact point with the edge portion 13 in the lowering process, Move in the pressing direction. This lateral pressing continues until the slag 4 moves to the central portion in the cavity 3 and the entire edge portion 13 contacts the inner wall of the slag side taper portion 7.

  Therefore, in the press apparatus 1 of the present embodiment, even when the slag 4 is not disposed at the center portion in the cavity 3, the position of the slag 4 is in the process of impacting and pressing the slag 4 by lowering the punch 8. Can be adjusted to an exact position, which makes it possible to produce a uniform thick roller.

  Next, a description will be given of a method for manufacturing a bottomed cylindrical roller using the press device 1 of the present embodiment configured as described above. When manufacturing a roller by the method of the present embodiment, first, FIG. As shown in FIG. 2, the slag 4 is disposed in the central portion of the cavity 3 of the lower mold 2.

  In this state, the punch 8 is lowered, and the tip end portion 9 of the punch is inserted into the cavity 3, whereby the pressing portion 10 is inserted into the recess 5 of the slag 4. .

  Then, as described above, in the press device 1 of the present embodiment, the angle at which the slag side taper portion 7 rises with respect to the surface of the slag side bottom portion 6 is set so that the punch side taper portion 11 has an angle with respect to the surface of the punch side bottom portion 11. Further, the slag side bottom part 6 and the punch side bottom part 11 have the same shape and dimensions as the outer diameter of the bottom part of the roller manufactured by the press apparatus of this embodiment, and each bottom part 6 has a larger angle than the rising angle. When the slug 4 is disposed in the central portion of the cavity 3 because the respective tapered portions 7 and 12 are connected to the peripheral portion of the first and second peripheral portions, first, as shown in FIG. An edge portion 13 at the boundary between the side taper portion 12 and the tip end portion 9 of the punch abuts against the inner wall of the slag side taper portion 12.

  After that, when the insertion of the punch 8 into the cavity 3 is continued, as shown in FIG. 4, the edge portion 13 pushes the slag side taper portion 12 to the outer peripheral side, and the insertion is further continued. Then, while the punch side bottom portion 11 is in contact with the slag side bottom portion 6, the slag 4 is shockedly pressed to the vicinity of the bottom portion of the cavity 3, whereby the slag 4 is moved to the punch 8 as shown in FIG. 5. The slag 4 is molded into a roller shape by plastic deformation along the outer periphery.

  On the other hand, when the slag 4 is disposed at a position shifted in the cavity 3, when the punch 8 is lowered, as shown in FIG. 6, the entire area of the edge portion 13 is a slag side taper portion. 7, the slag 4 is pushed laterally by the punch 8 at the place of contact with the edge portion 13 in the process of lowering the punch 8, and in the pressing direction. Move.

  This lateral pressing continues until the slag 4 moves to the central portion in the cavity 3 and the entire area of the edge portion 13 abuts against the inner wall of the slag side taper portion 7. After that, the edge portion 13 pushes and opens the slag-side tapered portion 12 to the outer peripheral side as shown in FIG. While the bottom 11 is in contact with the slag side bottom 6, the slag 4 is shockedly pressed to the vicinity of the bottom of the cavity 3, thereby causing the slag 4 to follow the outer periphery of the punch 8 as shown in FIG. The slag 4 can be molded into a roller shape by plastic deformation.

  Thus, in the press apparatus 1 of the present embodiment, both the slag side bottom portion 6 constituting the recess portion 5 formed on the upper surface of the slag 4 and the punch side bottom portion 11 constituting the pressing portion 10 formed at the tip of the punch 8 are used. The outer diameter of the bottom of the roller manufactured by the press apparatus of the embodiment is the same as the outer diameter, and the slag side taper portion 7 and the punch side taper portion 12 are formed on the peripheral portions of the bottom portions 6 and 11 obliquely upward on the outer peripheral side. , And the angle at which the slag side taper portion 7 rises with respect to the surface of the slag side bottom portion 6 is made larger than the rising angle of the punch side taper portion 11 with respect to the surface of the punch side bottom portion 11. It is possible to automatically adjust the position of the arranged slag 4.

  Therefore, in the press apparatus of this embodiment and the roller manufacturing method using the same, even in the method of manufacturing various rollers by the impact press, even when the slag is arranged shifted from the central portion of the cavity, it is corrected. Thus, it is possible to manufacture a roller having a slag disposed in the central part of the cavity, thereby making the wall thickness uniform in the circumferential direction.

  Since the present invention makes it possible to make the wall thickness uniform when manufacturing various types of cylindrical rollers or roller prototypes by the method of impact press, the present invention is generally applied to apparatuses for manufacturing various types of rollers using impact presses. Applicable.

DESCRIPTION OF SYMBOLS 1 Press apparatus 2 Lower mold | type 3 Cavity 4 Slag 5 Recessed part 6 Slag side bottom part 7 Slag side taper part 8 Punch 9 Punch tip part 10 Punch press part 11 Punch side bottom part 12 Punch side taper part 13 Edge part

Claims (2)

A lower mold (2) having a cavity (3);
A slag (4) disposed in the cavity (3) as a material;
A punch (8) disposed so as to be relatively movable with respect to the lower mold (2) and having a tip portion inserted into the cavity (3) by being lowered;
With the slag (4) disposed in the cavity (3), the punch (8) is lowered and the tip (9) of the punch (8) is inserted into the cavity (3). By pressing the slag (4) with the punch (8) in an impact manner and plastically deforming the slag (4) along the outer periphery of the punch (8), various bottomed cylindrical rollers A press device for manufacturing
On the upper surface of the slag (4),
A concave portion (5) having a slag side bottom portion (6) and a slag side taper portion (7) continuously provided obliquely upward from the peripheral edge of the slag side bottom portion (6) to the outer peripheral side. Formed,
At the tip of the punch (8) inserted into the cavity (3) and shockingly pressing the slag (4),
It has a punch side bottom part (11) and a punch side taper part (12) connected from the peripheral part of the punch side bottom part (11) obliquely upward on the outer peripheral side, and is inserted into the recess (5). A pressing part (10) that can be formed is formed,
The rising angle of the slag side taper part (7) with respect to the surface of the slag side bottom part (6) is made larger than the rising angle of the punch side taper part (12) with respect to the surface of the punch side bottom part (11). Press equipment. A lower mold (2) having a cavity (3), a slag (4) disposed in the cavity (3) as a material, and a lower mold (2) disposed so as to be movable relative to the lower mold (2) And a punch (8) whose tip is inserted into the cavity (3),
On the upper surface of the slag (4), a slag side bottom portion (6), and a slag side taper portion (7) continuously provided obliquely upward on the outer peripheral side from the peripheral portion of the slag side bottom portion (6), Forming a recess (5) with
A punch-side bottom (11) and a peripheral edge of the punch-side bottom (11) are provided at the tip of the punch (8) that is inserted into the cavity (3) and presses the slag (4) impactively. A pressing portion (10) having a punch-side taper portion (12) continuously provided obliquely upward on the outer peripheral side from the portion and capable of being inserted into the concave portion (5),
The rising angle of the slag side taper portion (7) with respect to the surface of the slag side bottom portion (6) is made larger than the rising angle of the punch side taper portion (12) with respect to the surface of the punch side bottom portion (11). A manufacturing method of a roller for manufacturing various types of bottomed cylindrical rollers using a pressing device,
Placing the slug (4) in the cavity (3);
Lowering the punch (8) and inserting the tip (9) of the punch (8) into the cavity (3),
While adjusting the position of the slag (4) by bringing the punch side tapered portion (12) of the punch (8) into contact with the slag side tapered portion (7), the punch (8) causes the slag (4) to move. A method for producing a roller, characterized in that the roller is formed into a roller shape by being impactively pressed and plastically deforming the slag (4) along the outer periphery of the punch (8).

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