JP5143219B2 - Bottomed cylindrical member, bottomed thin-walled cylindrical member, bottom disk-shaped bottomed cylindrical member, bottom disk-shaped bottomed thin-walled cylindrical member manufacturing method, and bottomed cylindrical member-bottomed thin-walled cylinder -Shaped member, bottom disk-shaped bottomed elongated cylindrical member and bottom disk-shaped bottomed thin-walled elongated cylindrical member - Google Patents

Description

  The present invention relates to a bottomed cylindrical member, a bottomed thin-walled extended cylindrical member, a bottom disk-shaped bottomed cylindrical member, a method for manufacturing a bottom-disc-shaped bottomed thin-walled cylindrical member, and a bottomed cylindrical member The present invention relates to a bottomed thin-walled cylindrical member, a bottom disk-shaped bottomed extending cylindrical member, and a bottom disk-shaped bottomed thin-walled extending cylindrical member.

  Conventionally, as a method for producing a bottomed cylindrical member, a backward extrusion molding method by forging is known. In this method of manufacturing a bottomed cylindrical member by backward extrusion, a hollow hole is formed with a punch die on the upper surface of a solid round bar as a workpiece, and at the same time, the metal constituting the material extruded by the punch die is a punch die. A cylindrical portion is formed by flowing in a gap with the die (see, for example, Patent Document 1).

JP 2010-94732 A

  However, in the manufacturing method of a bottomed cylindrical member by backward extrusion molding, usually, as shown in FIGS. 33A to 33C, a punch 101 serving as an upper mold and a die 102 serving as a lower mold are provided. However, since the direction in which the workpiece W flows is opposite to the pressurizing direction by the punch 101, the deformation resistance is increased. For this reason, a large pressurizing force is required for molding, and an excessive pressurizing force is also applied to the molding die. In addition, due to the excessive pressure, there is a problem that the life of the mold is remarkably shortened or the molding die and the work are fixed. In addition, it is difficult to form with a large cross-sectional reduction rate by the backward extrusion molding method. In particular, in the case of difficult-to-process materials such as NCF751, it is difficult to form a cross-sectional reduction rate of 60% or more. There was a problem that the cylindrical part could not be obtained.

  The present invention has been made in view of the above-mentioned present situation, and can be easily formed without requiring excessive pressure, and can have a bottomed cylindrical member and a bottomed thin wall that can improve mold life. Stretched cylindrical member, bottom disk-shaped bottomed cylindrical member and bottom disk-shaped bottomed thin-walled stretched cylindrical member manufacturing method, bottomed cylindrical member bottomed thin-walled cylindrical member, bottom disk-shaped bottomed It is an object of the present invention to provide a stretched cylindrical member and a bottomed disk-like bottomed thin-walled stretched cylindrical member.

The present invention is as follows.
1. By forging a solid columnar material, a cup-shaped expanded portion that is expanded in a cup shape toward the end on one end side of the material is formed, and the cup-shaped expanded portion and the cup-shaped expanded portion are formed. Obtaining an intermediate member comprising a cylindrical portion integrally formed on the small diameter side of the diameter portion;
The cup-shaped widened portion of the intermediate member is ironed to form a cylindrical portion in which the cup-shaped widened portion is processed into a cylindrical shape, and is integrated with the cylindrical portion and one end side of the cylindrical portion. And a step of obtaining a bottomed cylindrical member having a columnar portion formed on the bottom. A method for manufacturing a bottomed cylindrical member, comprising:
2. 1 above. By spinning the cylindrical portion of the bottomed cylindrical member manufactured by the manufacturing method described above, a thin stretched cylindrical portion is formed that is stretched in the axial direction so as to be thinner than the thickness of the cylindrical portion. And a bottomed thin-walled stretch member comprising a step of obtaining a bottomed thin-walled stretched cylindrical member comprising the thin-walled stretched cylindrical portion and a columnar portion integrally formed on one end side of the thin-walled stretched cylindrical portion. A method for manufacturing a cylindrical member.
3. The spinning process moves the processing roller in the extending direction while pressing the outer diameter side surface of the processing roller against the outer diameter side surface of the cylindrical portion of the rotated bottomed cylindrical member. 2. A process of forming a thin-walled elongated cylindrical part by causing the machining tool to not contact the inner diameter side surface of the cylindrical part during the process. A method for producing the bottomed thin-walled stretched cylindrical member described.
4). 1 above. By forming a bottomed cylindrical member manufactured by the manufacturing method described above by forging, a disk-shaped expanded portion in which the bottom side of the columnar portion is expanded in a disk shape is formed, and the disk-shaped expanded portion And a bottom disk-shaped bottomed cylindrical member comprising a step of obtaining a bottom disk-shaped bottomed cylindrical member having a cylindrical part integrally formed on one end side of the disk-shaped expanded diameter part Manufacturing method of member.
5). In the step of obtaining the bottom disk-shaped bottomed cylindrical member, the first mold for forming the bottom-side surface shape of the disk-shaped enlarged diameter portion, and the surface shape of the cylindrical portion on the outer surface side And a second mold for forming a surface shape other than the surface on the bottom side of the disk-shaped enlarged diameter portion, and a third mold for forming a bottomed cylindrical inner surface shape of the cylindrical portion, The disk-shaped enlarged diameter portion and the cylindrical portion are formed using
Thereafter, the third mold is first released. The manufacturing method of the bottom part disk-shaped bottomed cylindrical member of description.
6). 4. above. Or 5. A thin-walled stretched cylindrical shape that is stretched in the axial direction so as to be thinner than the thickness of the cylindrical portion by spinning the cylindrical portion of the bottom disc-shaped bottomed cylindrical member manufactured by the manufacturing method described above Forming a bottom disk-shaped bottomed thin-walled cylindrical member having a disk-shaped enlarged diameter portion formed integrally with one end of the thin-walled stretched cylindrical portion and the thin-walled stretched cylindrical portion The manufacturing method of the bottom part disk-shaped bottomed thin-walled extending | stretching cylindrical member characterized by including these.
7). The spinning process is performed in the direction of stretching while pressing the outer diameter side surface of the processing roller against the outer diameter side surface of the cylindrical part of the rotated bottom disc-shaped bottomed cylindrical member. 5. A process of forming a thin-walled elongated cylindrical part by moving a roller, wherein the machining tool is not brought into contact with the inner diameter side surface of the cylindrical part during the process. The manufacturing method of the bottom part disk-shaped bottomed thin extending | stretching cylindrical member of description.
8). 1 above. A bottomed cylindrical member manufactured by the manufacturing method described above.
9. 2. Or 3. A bottomed thin-walled stretched cylindrical member manufactured by the manufacturing method described above.
10. 4. above. Or 5. A bottom disc-shaped bottomed cylindrical member manufactured by the manufacturing method described above.
11. 6. above. Or 7. A bottom disk-shaped bottomed thin-walled stretched cylindrical member manufactured by the manufacturing method described above.

  According to the manufacturing method of the bottomed cylindrical member of the present invention and the bottomed cylindrical member manufactured by this manufacturing method, the diameter was first expanded in a cup shape toward the end on one end side of the material by forging. The cup-shaped enlarged portion is formed, and then the cup-shaped enlarged portion is processed into a cylindrical shape by ironing. Thereby, compared with the case where the same bottomed cylindrical member is obtained from the same solid columnar material by backward extrusion molding, the shape of the cylindrical portion can be easily formed with a small pressing force. Further, since an excessive pressurizing force is not applied, the mold life can be improved. Furthermore, since the cylindrical portion is formed after the diameter is once expanded to form the cup-shaped enlarged portion, the cylindrical portion having a thickness smaller than the thickness that can be formed by the conventional backward extrusion molding is formed. It can be formed easily.

According to the manufacturing method of the bottomed thin-walled stretched cylindrical member of the present invention and the bottomed thin-walled stretched cylindrical member manufactured by this manufacturing method, the axial direction so as to be thinner than the thickness of the cylindrical portion by spinning processing. A stretched thin-walled stretched cylindrical portion is formed. Thereby, compared with the case where the same thin extending | stretching cylindrical part is formed by forge processing, a thin extending | stretching cylindrical part with a smaller thickness can be formed easily.
Further, the spinning process is performed by moving the processing roller in the extending direction while pressing the processing roller against the outer diameter side surface of the cylindrical portion of the rotated bottomed cylindrical member. A forming die for defining a surface on the inner diameter side when forming a stretched cylindrical portion and when the processing tool does not contact the inner diameter side surface of the cylindrical portion during the processing Therefore, the number of machining tools can be reduced. As a result, processing with a simple configuration can be realized.

According to the manufacturing method of the bottom disk-shaped bottomed cylindrical member of the present invention and the bottom disk-shaped bottomed extending cylindrical member manufactured by this manufacturing method, the bottom side of the columnar part is formed into a disk shape by forging. An enlarged disk-like enlarged diameter portion is formed. Thereby, the bottom disk-shaped bottomed cylindrical member provided with a disk-shaped enlarged diameter part and a cylindrical part can be obtained easily.
Further, in the step of obtaining the bottom disk-shaped bottomed extended cylindrical member, a first mold for forming a surface shape on the bottom side of the disk-shaped enlarged diameter portion, and an outer surface side of the cylindrical portion And a second mold for forming a surface shape other than the surface on the bottom side of the disk-shaped enlarged portion, and a third shape for forming a bottomed cylindrical inner surface shape of the cylindrical portion When the disk-shaped enlarged diameter portion and the cylindrical portion are formed using a mold, and then the third mold is released first, the second mold and the third mold are Compared to the case of releasing at the same time, the mold and the workpiece can be easily released without being fixed.

According to the manufacturing method of the bottom disk-shaped bottomed thin-walled stretched cylindrical member of the present invention and the bottom disk-shaped bottomed thin-walled stretched cylindrical member manufactured by this manufacturing method, the thickness of the cylindrical portion is increased by spinning. A thin stretched cylindrical portion that is stretched in the axial direction so as to be thin is formed. Thereby, compared with the case where the same thin extending | stretching cylindrical part is formed by a forge process, a thinner thin extending | stretching cylindrical part can be formed easily.
Further, in the spinning process, the processing roller is moved toward the extending direction while pressing the processing roller against the outer diameter side surface of the cylindrical portion of the bottomed cylindrical member having the bottom disk shape. Is a process for forming a thin-walled elongated cylindrical part, and during the process, the inner diameter side surface is used when the processing tool is not brought into contact with the inner diameter side surface of the cylindrical part. Since the prescribed mold is not required, the number of machining tools can be reduced. As a result, processing with a simple configuration can be realized.

It is explanatory drawing for demonstrating the bottomed cylindrical member which concerns on Example 1, (a) is the raw material before shaping | molding, (b) is the intermediate member obtained from (a), (c) is from (b). The obtained bottomed cylindrical members are respectively shown. FIG. 6 is an explanatory diagram for explaining a manufacturing method of the bottomed cylindrical member according to the first embodiment. FIG. 6 is an explanatory diagram for explaining a manufacturing method of the bottomed cylindrical member according to the first embodiment. It is explanatory drawing for demonstrating the manufacturing method of a bottomed cylindrical member which concerns on Example 1, (a) is the state of the shaping | molding middle stage at the time of intermediate member shaping | molding, (b) has progressed shaping | molding rather than (a). The state, (c), shows the state where the molding has progressed more than (b). It is explanatory drawing for demonstrating the manufacturing method of the bottomed cylindrical member which concerns on Example 1, and shows the state which shaping | molding of the intermediate member was completed. It is explanatory drawing for demonstrating the manufacturing method of the bottomed cylindrical member which concerns on Example 1, and shows the state at the time of intermediate member mold release. FIG. 6 is an explanatory diagram for explaining an example of a deformation state at the time of forming an intermediate member according to the first embodiment. FIG. 6 is an explanatory diagram for explaining a manufacturing method of the bottomed cylindrical member according to the first embodiment. FIG. 6 is an explanatory diagram for explaining a manufacturing method of the bottomed cylindrical member according to the first embodiment. It is explanatory drawing for demonstrating the manufacturing method of the bottomed cylindrical member which concerns on Example 1, (a) is the state of the shaping | molding middle stage at the time of bottomed cylindrical member shaping | molding, (b) is shape | molded rather than (a). (C) shows a state where the molding has progressed more than (b). It is explanatory drawing for demonstrating the manufacturing method of the bottomed cylindrical member which concerns on Example 1, (a) is the state of the shaping | molding middle stage at the time of bottomed cylindrical member shaping | molding, (b) is shape | molded rather than (a). (C) shows a state where the molding has progressed more than (b). It is explanatory drawing for demonstrating the manufacturing method of the bottomed cylindrical member which concerns on Example 1, and shows the state which shaping | molding of the bottomed cylindrical member was completed. It is explanatory drawing for demonstrating the bottomed thin-walled extending | stretching cylindrical member which concerns on Example 2, (a) shows the member before shaping | molding, (b) shows the member obtained from (a), respectively. 6 is an explanatory diagram for explaining a method of manufacturing a bottomed thin-walled extending cylindrical member according to Example 2. FIG. It is explanatory drawing for demonstrating the manufacturing method of a bottomed thin-walled extending | stretching cylindrical member which concerns on Example 2, (a) is the state of a shaping | molding middle stage, (b) is the state which shaping | molding advanced rather than (a), respectively. Show. It is explanatory drawing for demonstrating the bottom part disk-shaped bottomed cylindrical member which concerns on Example 3, (a) shows the member before shaping | molding, (b) shows the member obtained from (a), respectively. 10 is an explanatory diagram for explaining a manufacturing method of a bottom disc-shaped bottomed cylindrical member according to Embodiment 3. FIG. It is explanatory drawing for demonstrating the manufacturing method of the bottom part disk shaped bottomed cylindrical member which concerns on Example 3, (a) is the state at the time of member insertion before shaping | molding, (b) is the upper and lower mold | type engaged. Each state is shown. It is explanatory drawing for demonstrating the manufacturing method of the bottom disk shaped bottomed cylindrical member which concerns on Example 3, (a) shows the state at the time of a shaping | molding start, (b) shows the state of the shaping | molding middle stage, respectively. It is explanatory drawing for demonstrating the manufacturing method of the bottom disk shaped bottomed cylindrical member which concerns on Example 3, (a) shows the state at the time of shaping | molding completion, (b) shows the state at the time of pin mold release, respectively. . It is explanatory drawing for demonstrating the manufacturing method of the bottom part disk-shaped bottomed cylindrical member which concerns on Example 3, (a) is the state at the time of mold release, (b) at the time of mold release of a lower mold Each state is shown. It is explanatory drawing for demonstrating the bottom part disk-shaped bottomed thin extending cylindrical member which concerns on Example 4, (a) shows the member before shaping | molding, (b) shows the member obtained from (a), respectively. FIG. 10 is an explanatory diagram for explaining a manufacturing method of a bottom disc-shaped bottomed thin-walled elongated cylindrical member according to Example 4; It is explanatory drawing for demonstrating the manufacturing method of the bottom disk-shaped bottomed thin-walled extending | stretching cylindrical member which concerns on Example 4, (a) is a state in the middle of shaping | molding, (b) is shaping | molding progressing rather than (a). Each state is shown. It is explanatory drawing for demonstrating the bottomed cylindrical member (intermediate member) which concerns on other embodiment. It is explanatory drawing for demonstrating the manufacturing method of a bottomed cylindrical member (intermediate member) which concerns on other embodiment. It is explanatory drawing for demonstrating the manufacturing method of a bottomed cylindrical member (intermediate member) which concerns on other embodiment. It is explanatory drawing for demonstrating the manufacturing method of a bottomed cylindrical member (intermediate member) which concerns on other embodiment, (a) is the state of the shaping | molding middle stage at the time of intermediate member shaping | molding, (b) is from (a). Also, the state in which the molding has progressed, and (c) shows the state in which the molding has progressed more than (b). It is explanatory drawing for demonstrating the manufacturing method of the bottomed cylindrical member (intermediate member) which concerns on other embodiment, and shows the state which shaping | molding of the intermediate member was completed. It is explanatory drawing for demonstrating the manufacturing method of the bottomed cylindrical member (intermediate member) which concerns on other embodiment, and shows the state at the time of intermediate member mold release. It is explanatory drawing for demonstrating the (a) bottom disk-shaped bottomed cylindrical member and (b) bottom disk-shaped bottomed extended cylindrical member which concern on other embodiment. It is explanatory drawing for demonstrating the processing rollers (a) and (b) which concern on other embodiment. It is explanatory drawing for demonstrating the manufacturing method of the conventional bottomed cylindrical member, (a) is the state at the time of shaping | molding start, (b) is the state which shaping | molding advanced rather than (a), (c) is ( The state in which the molding has progressed is shown in FIG.

1. Manufacturing method of bottomed cylindrical member The manufacturing method of a bottomed cylindrical member according to the present embodiment is forged into a cup shape toward one end of the material by forging a solid columnar material. Forming a cup-shaped enlarged portion having a diameter, and obtaining an intermediate member comprising the cup-shaped enlarged portion and a columnar portion integrally formed on the small-diameter side of the cup-shaped enlarged portion; and the intermediate member The cup-shaped widened portion is formed into a cylindrical portion obtained by ironing the cup-shaped widened portion, and is formed integrally with the cylindrical portion and one end side of the cylindrical portion. And a step of obtaining a bottomed cylindrical member having a columnar part.

  The type of forging is not particularly limited. For example, hot forging for processing at a material temperature of 800 ° C. or higher, warm forging for processing at a material temperature of about 200 to 800 ° C., and cold for processing at a material temperature of about room temperature to about 200 ° C. Can be forged between. Among these, hot forging is preferable from the viewpoint of ease of processing and not requiring excessive pressure (pressing force).

  The type of ironing process is not particularly limited. For example, hot ironing is performed at a material temperature of 800 ° C. or more, warm ironing is performed at a material temperature of about 200 to 800 ° C., and cold processing is performed at a material temperature of room temperature to about 200 ° C. Can be interstitial. Of these, cold ironing is preferred from the viewpoints of good machining accuracy, low heating temperature compared to hot and warm machining, or no need for heating.

  As long as the “material” has a solid cylindrical shape, the outer diameter, the height, and the like are not particularly limited. Also, the material of this material is not particularly limited. For example, heat-resistant steel such as NCF751, SUH35, SUH38, SUH3, SUH11, alloy steel such as SCR material and SCM material, stainless steel such as SUS304 and SUS430, S45C, S20C, etc. And carbon steel for machine structure. Among these, particularly difficult-to-process materials such as heat-resistant steel and stainless steel can be used.

  The above-mentioned “intermediate member” is a member obtained by hot forging the above-mentioned material, and a cup-shaped enlarged portion that is expanded in a cup shape toward the end on one end side of the material, and this cup-shaped expanded portion. And a cylindrical part integrally formed on the small diameter side of the diameter part (see, for example, FIG. 1B).

The height and thickness of the cup-shaped enlarged diameter portion are not particularly limited. The cup-shaped enlarged diameter portion can be reduced in thickness, for example, toward the end side (see, for example, FIG. 1B). As a result, it is possible to suppress variation between the reduced diameter amount on the large diameter side and the reduced diameter side on the small diameter side of the cup-shaped expanded diameter portion by ironing, and form a cylindrical portion having a substantially uniform thickness. Because it can. Moreover, the cup-shaped enlarged diameter part can be substantially uniform in thickness, for example. Furthermore, the thickness of the cup-shaped enlarged diameter portion can increase, for example, toward the end side (see, for example, FIG. 25). Thereby, the flow to the direction opposite to a pressurization direction can be suppressed among the directions in which the meat of the raw material flows during forging (see, for example, FIGS. 28A to 28C). This is because the deformation resistance can be further reduced as compared with the case where the thickness of the diameter-enlarged portion is substantially uniform or decreases toward the end. In addition, the cup-shaped enlarged diameter portion can be appropriately set in thickness and height, for example, so that a cylindrical portion having a desired thickness and height can be obtained after ironing.
Although the magnitude | size of the outer diameter of the said cylindrical part is not ask | required in particular, For example, the magnitude | size of the outer diameter of the said raw material can be substantially the same.

  The “bottomed cylindrical member” is a member obtained by ironing the intermediate member, and a cylindrical part in which the cup-shaped enlarged diameter part is processed into a cylindrical shape by the ironing process, and the cylindrical part And a cylindrical portion integrally formed on one end side (for example, see FIG. 1C). In this bottomed cylindrical member, the size and height of the outer diameter of the columnar portion are substantially the same as the size and height of the outer diameter of the columnar portion of the intermediate member. In addition, the outer diameter of the columnar portion and the outer diameter of the cylindrical portion are substantially the same.

  The thickness, height, etc. of the cylindrical part are not particularly limited. The cylindrical portion can be made, for example, by ironing so that the thickness thereof is smaller than the thickness of the cup-shaped enlarged diameter portion before processing (for example, FIGS. 1B and 1C). ) Etc.). Further, the thickness of the cylindrical portion can be substantially uniform toward the end portion, for example, but may be decreased toward the end portion. Moreover, this cylindrical part can be larger than the height of the cup-shaped enlarged diameter part before processing, for example by ironing (for example, FIG.1 (b), ( c) etc.).

  In the “step for obtaining the intermediate member”, for example, an upper mold having a convex portion for forming the inner wall shape of the cup-shaped enlarged portion, and a concave portion for forming the outer wall shape of the cup-shaped enlarged portion. And a lower mold having (see, for example, FIG. 2 and the like). In this case, for example, the lower die is provided with a guide portion for guiding the upper die in the pressurizing direction when engaged with the upper die, and the upper die is guided by the guide portion. A guided portion can be provided (see, for example, FIG. 2). Thereby, it is possible to manufacture the bottomed cylindrical member having excellent dimensional accuracy by suppressing the positional deviation between the upper die and the lower die due to the pressurization and reliably engaging with each other. In addition, the upper die is provided, for example, on the base end side of the convex portion, and suppresses uneven growth of the end portion of the cup-shaped enlarged diameter portion during forging. A growth suppression unit can be provided (see, for example, FIGS. 2 and 7).

In the above-mentioned “step of obtaining a bottomed cylindrical member”, for example, using a lower mold in which a through hole is formed and an upper mold having a round bar-like protrusion, an intermediate member is formed in a columnar shape in the through hole. The cup-shaped enlarged-diameter portion can be processed into a cylindrical shape by inserting it from the portion side, pressing the intermediate member with the protrusion and allowing it to pass through the through hole (see, for example, FIGS. 8 to 12).
In performing the ironing process, an annealing process may be performed in advance. This is because stretchability is improved and processing can be performed more easily.

2. Method for Producing Bottomed Thin-walled Stretched Cylindrical Member The method for producing a bottomed thin-walled stretched cylindrical member according to the present embodiment spins the cylindrical portion of the bottomed cylindrical member produced by the manufacturing method of the first embodiment. As a result, a thin stretched cylindrical portion is formed which is axially stretched so as to be thinner than the thickness of the cylindrical portion, and is integrally formed on one end side of the thin stretched cylindrical portion and the thin stretched cylindrical portion. Including a step of obtaining a bottomed thin-walled elongated cylindrical member having a cylindrical portion.

  The kind of the spinning process is not particularly limited. For example, hot spinning for processing at an object temperature of 800 degrees or higher, warm spinning for processing at an object temperature of about 200 to 800 degrees, and cold processing at an object temperature of about 200 to 200 degrees. Can be spinning between. Of these, cold spinning is preferable from the viewpoints of good machining accuracy, low heating temperature compared to hot and warm machining, or no need for heating.

In the spinning process, the processing tool is moved toward the extending direction while pressing a processing tool such as a processing roller or a processing spatula against the outer diameter side surface of the cylindrical portion of the bottomed cylindrical member that has been rotated. Is a process for forming a thin-walled stretched cylindrical portion by moving. This spinning process may be, for example, a process using a processing tool such as a mandrel (molding die) for defining a surface on the inner diameter side of the cylindrical portion, or without using such a processing tool, During the processing, processing may be performed in which the processing tool is not brought into contact with the inner diameter side surface of the cylindrical portion.
The pressing amount in the spinning process, the number of movements in the extending direction, etc. are not particularly limited.

  Further, the inner diameter of the thin cylindrical portion processed by the spinning process may be substantially the same as the inner diameter of the cylindrical portion before processing (for example, FIG. 13). (See (a), (b), etc.), and may be processed so as to be smaller than the inner diameter of the cylindrical portion before processing. In addition, the size of the outer diameter of the thin-walled extending cylindrical portion processed by the spinning process is usually smaller than the size of the outer diameter of the cylindrical portion before processing (for example, FIG. 13 (a), (See (b) etc.).

  In addition, the processing tool that presses against the outer diameter side surface of the cylindrical portion, such as a processing roller or a processing spatula, is not particularly limited in the cross-sectional shape of the pressing surface. Can be. Further, when the cross-sectional shape of the pressing surface of the processing tool is substantially arcuate, the radius of curvature can be, for example, 1.0 times or more the thickness of the cylindrical portion to be processed, preferably It can be 2.0 times or more, more preferably 3.0 times or more. This is because the pressing surface of the processing roller can be pressed against the work with a sufficient contact area and can be suitably stretched.

  The above-mentioned “bottomed thin-walled stretched cylindrical member” is a member obtained by spinning the above-mentioned bottomed cylindrical member, and is thinly stretched in the axial direction so as to be thinner than the thickness of the cylindrical portion. A cylindrical portion and a columnar portion integrally formed on one end side of the thin-walled extending cylindrical portion are provided (see, for example, FIG. 13B).

  The height, thickness, etc. of the thin stretched cylindrical portion are not particularly limited. The thin-walled elongated cylindrical portion is usually subjected to spinning processing, so that its thickness is usually smaller than the thickness of the cylindrical portion before processing, and its height is larger than the height of the cylindrical portion. (See, for example, FIGS. 13A and 13B).

  In the present embodiment, the spinning process is performed in the direction of stretching while pressing the outer diameter side surface of the processing roller against the outer diameter side surface of the cylindrical portion of the bottomed cylindrical member that has been rotated. It is preferable that the thinned stretched cylindrical portion is formed by moving the processing roller and that the processing tool is not brought into contact with the inner diameter side surface of the cylindrical portion during the processing. (For example, see FIG. 14, FIG. 15 (a), (b) etc.). This is because a molding die for defining a surface on the inner diameter side is not required, so that the number of machining tools can be reduced, and a thin-walled stretched cylindrical portion can be easily formed.

  The structure, size, number, etc. of the “processing roller” are not particularly limited. For example, the outer diameter of the processing roller may be about 3 to 5 times the outer diameter of the cylindrical portion. This is because the total number of rotations of the processing rollers in one spinning process can be suppressed, and wear of the outer diameter side surface (pressing surface) can be suppressed.

Here, for example, a plurality of the processing rollers can be provided. This is because the time required for processing can be shortened as compared with the case of processing using one processing roller. Moreover, as an arrangement | positioning form of a some processing roller, the form (for example, see FIG. 32 (a), (b) etc.) arrange | positioned in the circumferential direction of a workpiece | work, the form arrange | positioned in an axial direction, etc. are mentioned, for example. . Furthermore, as a form of pressing the plurality of processing rollers, for example, (1) a form in which each processing roller is pressed toward the center of the workpiece (see, for example, FIG. 32A), (2) each processing Examples include a form of pressing so that the pressing directions of the rollers are parallel to each other (see, for example, FIG. 32B).
In performing the spinning process, the bottomed cylindrical member may be previously annealed. This is because stretchability is improved and processing can be performed more easily.

3. Manufacturing method of bottom disk-shaped bottomed cylindrical member The manufacturing method of the bottom disk-shaped bottomed cylindrical member according to the present embodiment forges the bottomed cylindrical member manufactured by the manufacturing method of the first embodiment. Thus, a disk-shaped enlarged portion whose diameter is expanded in a disc shape on the bottom side of the cylindrical portion and a cylindrical portion formed integrally on one end side of the disc-shaped enlarged portion are formed, and the disc-like shape is formed. It includes a step of obtaining a bottomed disk-shaped bottomed cylindrical member having an enlarged diameter portion and the cylindrical portion.

  The type of forging is not particularly limited. For example, hot forging for processing at a material temperature of 800 ° C. or higher, warm forging for processing at a material temperature of about 200 to 800 ° C., and cold for processing at a material temperature of about room temperature to about 200 ° C. Can be forged between. Among these, hot forging is preferable from the viewpoint of ease of processing and not requiring excessive pressure (pressing force).

  The “bottom disc-shaped bottomed cylindrical member” is a member obtained by forging the bottomed cylindrical member, and the bottom side of the columnar portion of the bottomed cylindrical member is expanded in a disc shape. And a cylindrical part integrally formed on one end side of the disk-shaped enlarged part (see, for example, FIG. 16B).

  There is no particular limitation on the size, height, etc. of the outer diameter of the disk-shaped enlarged portion. This disk-shaped enlarged diameter portion is usually subjected to forging, so that the bottom-side meat of the columnar portion of the bottomed cylindrical member is usually expanded into a flat disk shape (for example, FIG. 16). (See (a), (b), etc.). Moreover, this disk-shaped enlarged diameter part can be a shape which diameter-expands toward the bottom part side from the side connected to the cylindrical part, for example (for example, refer Fig.31 (a) etc.).

  The outer diameter of the cylindrical portion is substantially the same as the outer diameter of the bottomed cylindrical member. In addition, for example, the cylindrical portion is forged so that a part of the columnar portion of the bottomed cylindrical member can be formed into a cylindrical shape (see, for example, FIG. 31 (b)). )). Thereby, the cylindrical part extended | stretched to the axial direction rather than the cylindrical part of a bottomed cylindrical member can be formed.

  Here, the step of obtaining the bottomed disk-shaped bottomed cylindrical member includes, for example, forging the bottomed cylindrical member to expand the bottom side of the columnar part of the bottomed cylindrical member into a disk shape. The disk-shaped enlarged diameter portion is formed integrally with one end of the disk-shaped enlarged diameter portion, and the cylindrical portion is formed by extending the cylindrical portion in the axial direction. And a bottom disk-shaped bottomed cylindrical member including the cylindrical portion (see, for example, FIG. 31A).

  Here, in the step of obtaining the bottom disk-shaped bottomed cylindrical member, for example, a first mold (upper mold) for forming a surface shape on the bottom side of the disk-shaped enlarged diameter portion, and a cylindrical shape A second die (lower mold) for forming a surface shape other than the surface shape on the outer surface side of the part and the surface on the bottom side of the disk-shaped enlarged diameter portion, and the bottomed cylindrical inner surface shape of the cylindrical part The third mold (pin) for forming can be used to form the disk-shaped enlarged diameter portion and the cylindrical portion, and then the third mold can be released first ( For example, refer to FIGS.

  In the above case, for example, the first mold, the second mold, and the third mold are arranged from the top in the order of the first mold, the second mold, and the third mold, and the second mold. The mold is pressed by a fluid cylinder in a direction opposite to the pressing direction of the first mold with a predetermined pressing force, and can be translated in the pressing direction against the pressing force (for example, Refer to FIG. Further, in this case, in the step of obtaining the bottom disk-shaped bottomed cylindrical member, first, the second mold is lowered by lowering the first mold toward the second mold into which the bottomed cylindrical member is inserted. And then engaging the first mold, then pressing the second mold by further lowering the first mold, and lowering both the second mold and the first mold together, Thereby, the third mold, the second mold, and the first mold are engaged to form the disk-shaped enlarged diameter portion and the cylindrical portion, and then the first mold is raised. The second mold can be lifted together with the first mold matched to the first mold, thereby releasing the third mold (see, for example, FIGS. 17 to 21). Thereby, the easy mold release which a metal mold | die and a workpiece | work are hard to adhere | attach with a simple structure is realizable.

  The type of the fluid cylinder is not particularly limited, and examples thereof include a fluid cylinder filled with a compressible fluid such as nitrogen gas, a fluid cylinder that drives and controls an incompressible fluid such as hydraulic oil by a drive unit, and the like. Of these, a fluid cylinder in which a compressive fluid is sealed is preferable from the viewpoint of a simple structure.

4). Manufacturing method of bottom disk-shaped bottomed thin-walled extending cylindrical member The manufacturing method of the bottom disk-shaped bottomed thin-walled extending cylindrical member according to the present embodiment is the bottom disk-shaped substrate manufactured by the manufacturing method of the third embodiment. Spinning the cylindrical portion of the bottom-stretched cylindrical member forms a thin-walled cylindrical portion that is axially stretched so as to be thinner than the thickness of the cylindrical portion. The method includes a step of obtaining a bottom disk-shaped bottomed thin-walled thin cylindrical member having a disk-shaped enlarged diameter portion formed integrally with one end of the thin-walled cylindrical cylindrical portion.

  The above-mentioned “bottom disk-shaped bottomed thin-walled elongated cylindrical member” is a member obtained by spinning the above-mentioned bottom disk-shaped bottomed-stretched cylindrical member so as to be thinner than the thickness of the cylindrical portion. A thin-walled cylindrical portion extending in the axial direction, and a disk-shaped enlarged diameter portion formed integrally with one end of the thin-walled cylindrical portion (see, for example, FIG. 22).

  The height, thickness, etc. of the thin stretched cylindrical portion are not particularly limited. The thin-walled elongated cylindrical portion is usually subjected to spinning processing, so that its thickness is usually smaller than the thickness of the cylindrical portion before processing, and its height is larger than the height of the cylindrical portion. (For example, see FIGS. 22A, 22B, 31B, etc.).

  In the present embodiment, the form of the spinning process can be the same as the form of the spinning process described in the second embodiment, for example. Moreover, when performing the said spinning process, you may make it perform an annealing process previously to the said bottom part disk-shaped bottomed cylindrical member. This is because stretchability is improved and processing can be performed more easily.

Hereinafter, the present invention will be specifically described with reference to the drawings. In the present embodiment, the case where NCF751, which is a difficult-to-process material, is used as a material is illustrated.
<Example 1>
(1) Configuration of Bottomed Cylindrical Member As shown in FIGS. 1A to 1C, the bottomed cylindrical member 3 according to this embodiment includes an intermediate member 2 obtained by forging the material 1. It is a member obtained by ironing and includes a columnar portion 3a and a cylindrical portion 3b. The outer diameter D3a of the columnar portion 3a and the outer diameter D3b of the cylindrical portion 3b are substantially equal. Further, the bottomed cylindrical member 3 is formed with a bottomed hole 3c that opens to the end portion side on the cylindrical portion 3b side. The bottomed hole 3c has an inner diameter d3c and a depth H3c.

(2) Manufacturing method of bottomed cylindrical member Next, the manufacturing method of the said bottomed cylindrical member is demonstrated.
First, a cup-shaped enlarged diameter in which the cylindrical portion 2a shown in FIG. 1 (b) and one end thereof are expanded by forging the solid cylindrical material 1 shown in FIG. 1 (a). The intermediate member 2 having the portion 2b is obtained. In this embodiment, the forging process employs hot forging. In this hot forging, as shown in FIG. 2, while holding the upper mold 11 having the convex portion 11a for forming the inner wall shape of the cup-shaped enlarged portion 2b, the material 1, and the cup-shaped enlarged diameter. A lower mold 12 having a concave portion 12a for forming the outer wall shape of the portion 2b is used. A knockout pin 13 is inserted into the recessed portion 12a from below, and the material 1 is held when the material 1 is inserted into the recessed portion 12a. The lower mold 12 is provided with a guide part 12b for guiding the upper mold 11 in the pressurizing direction when engaged with the upper mold 11, and the upper mold 11 is guided to the guide part 12b. A guided portion 11b is provided. Furthermore, the upper mold 11 has a growth suppressing portion 11c for suppressing the growth of the end portion of the cup-shaped enlarged diameter portion 2b on the base end side of the convex portion 11a in the forging process. Is provided.

  In obtaining the intermediate member 2 from the material 1, first, as shown in FIG. 3, the material 1 is inserted into the concave portion 12 a of the lower mold 12, the upper mold 11 is lowered, and the convex portion 11 a is formed on the material 1. Press to apply pressure. Then, as shown in FIGS. 4A to 4C, the material 1 is compressed by the convex portion 11a, the meat of the material 1 is pushed out, and flows out obliquely backward with respect to the pressurizing direction. That is, the meat pushed out by the convex portion 11 a flows out into the gap between the upper mold 11 and the lower mold 12 in a direction intersecting with the pressing direction. As shown in FIG. 5, when the upper mold 11 reaches the descending end, the formation of the cup-shaped enlarged diameter portion 2b is completed. Finally, as shown in FIG. 6, the upper die 11 is raised and the knockout pin 13 is raised and released to obtain the intermediate member 2.

In this embodiment, as shown in FIG. 3, the guided portion 11 b of the upper mold 11 engages with the guide portion 12 b of the lower mold 12 before the convex portion 11 a contacts the material 1. Thereafter, the guide is guided until the upper mold 11 reaches the lower end. Thereby, the upper mold | type 11 and the lower mold | type 12 can be match | combined reliably.
Also, as shown in FIG. 7, when the meat at the end of the cup-shaped enlarged diameter portion 2b grows unevenly when forging the material 1, the unevenly grown end contacts the growth suppressing portion 11c. By doing so, the further growth is suppressed, and the cup-shaped enlarged diameter portion 2b having a substantially uniform height is formed.

  As shown in FIG. 1B, the intermediate member 2 obtained in this way has a cylindrical portion 2a having an outer diameter D2a that is substantially the same as the outer diameter D1 of the material 1, and an enlarged diameter toward the end. And a cup-shaped enlarged diameter portion 2b having an outer diameter D2b at its end. Moreover, a mortar-shaped bottomed hole 2c is formed on the cup-shaped enlarged diameter portion 2b side. The bottomed hole 2c has a height H2c. Further, the cup-shaped enlarged diameter portion 2b is formed so that its thickness t2b decreases as it goes toward the end.

  Next, ironing is performed on the intermediate member 2 obtained as described above. In this embodiment, the ironing process employs cold ironing. In this cold ironing process, as shown in FIG. 8, a lower mold 22 in which a through hole 22a is formed and an upper mold 21 having a round bar-shaped protrusion 21a are used. The through hole 22a of the lower mold 22 is formed so as to be gradually reduced in diameter from the opening on the upper end side, and has a minimum inner diameter d22a at an intermediate position in the axial direction. The inner diameter d22a is set so that a desired outer diameter D3b is obtained in the bottomed cylindrical member 3 obtained after ironing. Moreover, the lower end side of the through hole 22a is set to an inner diameter larger than the inner diameter d22a, so that a workpiece subjected to ironing through the portion of the inner diameter d22a of the through hole 22a can be easily passed. Yes. The protrusion 21a of the upper mold 21 is set so that the outer diameter D21a of the bottomed cylindrical member 3 obtained after ironing can provide a desired inner diameter d3c. Note that an air hole 21b is formed in the protruding portion 21a, and air can be supplied to the distal end side of the protruding portion 21a so that the inside of the bottomed hole 3c is not in a vacuum state at the time of mold release.

  In obtaining the bottomed cylindrical member 3 from the intermediate member 2, first, as shown in FIG. 9, the upper mold 21 is inserted by inserting the columnar portion 2 a side of the intermediate member 2 into the through hole 22 a of the lower mold 22. Is lowered. The protruding portion 21a of the lowered upper mold 21 comes into contact with the bottom wall of the bottomed hole 2c of the intermediate member 2 and pushes the intermediate member 2 downward. Then, as shown in FIGS. 10 (a) to 10 (c) and FIGS. 11 (a) to 11 (c), the cup-shaped enlarged diameter portion 2b is formed by the outer wall of the projection 21a and the inner wall of the through hole 22a. It is reduced in diameter and thinned, and becomes a cylindrical shape having an outer diameter that follows the minimum inner diameter d22a of the through hole 22a. At this time, the cup-shaped enlarged diameter portion 2b is deformed in a direction intersecting the pressurizing direction by a relatively small pressure applied by the projection 21a. Then, as shown in FIG. 12, when the work is pushed down until it passes through the position of the inner diameter d22a of the through hole 22a, the formation of the cylindrical portion 3b is completed, and the bottomed cylindrical member 3 is obtained. In addition, the workpiece | work which passed the location of the internal diameter d22a of the through-hole 22a falls in the through-hole 22a, and is discharged | emitted from the lower metal mold | die 22 by this.

  As shown in FIG. 1C, the bottomed cylindrical member 3 thus obtained has a columnar portion 3a having an outer diameter D3a substantially the same as the outer diameter D2a of the columnar portion 2a of the intermediate member 2. A cylindrical portion 3b having an outer diameter D3b substantially the same as the outer diameter D3a of the columnar portion 3a. Also, a bottomed hole 3c having an inner diameter d3c and a height H3c is formed on the cylindrical portion 3b side. Further, the cylindrical portion 3b is formed so that the thickness t3b is thinner than the thickness t2b of the cup-shaped enlarged-diameter portion 2b, and has a substantially uniform thickness in the axial direction of the bottomed cylindrical member 3. Has been.

(3) Effects of Example 1 As described above, in the present example, the cup-shaped enlarged diameter portion 2b formed so as to expand toward the end on one end side by hot forging first. The intermediate member 2 provided is obtained, and then the bottomed cylindrical member 3 is obtained by forming a cylindrical portion 3b obtained by processing the cup-shaped enlarged diameter portion 2b into a cylindrical shape by cold ironing. Thereby, compared with the case where the same member is obtained by back extrusion molding from a solid cylindrical material, the shape of the cylindrical portion 3b can be easily formed with a small pressing force. Further, since an excessive pressurizing force is not applied, the mold life can be improved. Further, since the cylindrical portion 3b is formed after the diameter is once expanded to form the cup-shaped enlarged portion 2b, the bottomed cylindrical member 3 having the thin cylindrical portion 3b which is difficult to obtain by the backward extrusion molding. Can be obtained.

  In the present embodiment, the upper mold 11 having the convex portion 11a for forming the inner wall shape of the cup-shaped enlarged portion 2b and the material 1 are held, and the outer wall shape of the cup-shaped enlarged portion 2b is used. The lower mold 12 having the concave portion 12a to be formed is used, and the growth suppressing portion 11c is provided on the base end side of the convex portion 11a, so that the cup-shaped enlarged diameter portion 2b is formed during forging. It can suppress that the meat | flesh of the edge part of this grows unevenly.

  Further, the lower die 12 is provided with a guide portion 12b for guiding the upper die 11 in the pressurizing direction when engaged with the upper die 11, and the upper die 11 is guided to the guide portion 12b. Since the guided portion 11b is provided, the upper mold 11 and the lower mold 12 can be reliably aligned.

<Example 2>
In this example, a method of obtaining a bottomed thin-walled stretched cylindrical member including a thin-walled stretched cylindrical part and a columnar part from the bottomed cylindrical member obtained by the manufacturing method of Example 1 will be described.

(1) Configuration of Bottomed Thin-Walled Stretched Cylindrical Member As shown in FIG. 13B, the bottomed thin-walled stretched cylindrical member 4 according to the present embodiment includes a columnar portion 4a and a thin-walled stretched cylindrical portion 4b. I have. Further, the bottomed thin-walled extending cylindrical member 4 is formed with a bottomed hole 4c that opens to the end side on the thin-walled extending cylindrical portion 4b side. As shown in FIGS. 13A and 13B, the thin stretched cylindrical portion 4 b has an outer diameter D4 b smaller than the outer diameter D3 b of the cylindrical portion 3 b of the bottomed cylindrical member 3. The bottomed hole 4c has an inner diameter d4c that is substantially equal to the inner diameter d3c of the bottomed hole 3c of the bottomed cylindrical member 3, and the depth H4c of the bottomed hole 4c is that of the bottomed cylindrical member 3. It is processed to be larger than the depth H3c of the bottom hole 3c. Further, the thickness t4b of the thin-walled extending cylindrical portion 4b is smaller than the thickness t3b of the cylindrical portion 3b of the bottomed cylindrical member 3. That is, in the bottomed thin-walled extending cylindrical member 4 according to the present embodiment, the thin-walled extending cylindrical portion 4b is thinner than the cylindrical portion 3b of the bottomed cylindrical member 3 and extends in the axial direction. Is formed.

(2) Manufacturing Method of Bottomed Thin-Walled Stretched Cylindrical Member Next, a manufacturing method of the bottomed thin-walled stretched cylindrical member will be described. In the present embodiment, spinning processing is performed on the bottomed cylindrical member 3 obtained as described above. In this embodiment, the spinning process is cold spinning. In this cold spinning process, as shown in FIG. 14, a processing roller 31 and a chuck 32 are used. The processing roller 31 is supported by moving means (not shown) so as to be freely movable in the center direction (x-axis direction in FIG. 14) and the axial direction (z-axis direction in FIG. 14) of the bottomed cylindrical member 3 serving as a workpiece. Has been. Further, the processing roller 31 is rotatably supported around an axis in the z-axis direction. When the processing roller 31 is pressed against the outer peripheral surface of the rotating bottomed cylindrical member 3, the processing roller 31 rotates with the rotation. It has become.

  Further, the pressing surface 31a of the processing roller 31 has a substantially arc shape, and the radius of curvature is R31a. The radius of curvature R31a of the pressing surface 31a is set to about three times the wall thickness t3b of the cylindrical portion 3b of the bottomed cylindrical member 3. The processing roller 31 has an outer diameter D31 set to about three times the outer diameter D3b of the cylindrical portion 3b of the bottomed cylindrical member 3 serving as a workpiece. The chuck 32 fixedly supports the bottomed cylindrical member 3 serving as a workpiece and can be rotated by a rotation driving means (not shown), whereby the workpiece can be rotated. In this embodiment, a processing tool such as a mold used in normal spinning processing is not used.

  In obtaining the bottomed thin-walled elongated cylindrical member 4 from the bottomed cylindrical member 3, first, as shown in FIG. 14, the bottomed cylindrical member 3 is fixedly supported by the chuck 32 and rotated. The pressing surface 31a is pressed against the work. Then, as shown in FIG. 15 (a), the outer diameter of the portion of the cylindrical portion 3b against which the processing roller 31 is pressed is reduced to reduce the thickness. In this embodiment, at this time, a machining tool that defines the inner diameter side surface of the cylindrical portion 3b is not used, but the size of the inner diameter hardly changes.

  Then, when the processing roller 31 is moved in the z-axis direction in this state, the portion corresponding to the cylindrical portion 3b is extended in the axial direction and the processing roller 31 passes as shown in FIG. 15 (b). The thickness of the part will be reduced. As a result, a thin-walled stretched cylindrical portion 4b that is thinner than the wall thickness t3b of the cylindrical portion 3b and is stretched in the axial direction is formed, and the bottomed thin-walled stretched cylindrical member 4 is obtained.

  The bottomed thin-walled extending cylindrical member 4 obtained in this way is a circle having an outer diameter D4a that is substantially the same as the outer diameter D3a of the columnar portion 3a of the bottomed cylindrical member 3 as shown in FIG. A columnar portion 4a and a thin-stretched cylindrical portion 4b having an outer diameter D4b smaller than the outer diameter D3b of the cylindrical portion 3b of the bottomed cylindrical member 3 are provided. Also, a bottomed hole 4c having an inner diameter d4c and a height H4c is formed on the thin-walled extending cylindrical portion 4b side. Furthermore, the thin-walled elongated cylindrical portion 4b has a wall thickness t4b that is thinner than the wall thickness t3b of the cylindrical portion 3b of the bottomed cylindrical member 3, and the shaft of the bottomed thin-walled cylindrical member 4 The thickness is almost uniform in the direction.

(3) Effect of Example 2 As described above, in this example, the film was stretched in the axial direction so as to be thinner than the thickness of the cylindrical portion 3b of the bottomed cylindrical member 3 by cold spinning. A thin stretched cylindrical portion 4b is formed. Thereby, compared with the case where the same thin extending | stretching cylindrical part is formed by forge processing, a thin extending | stretching cylindrical part with a smaller thickness can be formed easily.
In the cold spinning process, the processing roller 31 is moved in the extending direction while pressing the processing roller 31 against the outer diameter side surface of the cylindrical portion 3b of the rotated bottomed cylindrical member 3. Is a process for forming the thin stretched cylindrical part 4b by the process in which the machining tool is not brought into contact with the inner diameter side surface of the cylindrical part during the process. Without requiring a mold, it is possible to easily form a thin stretched cylindrical portion.

  Furthermore, in this embodiment, the cross-sectional shape of the pressing surface 31a of the processing roller 31 is substantially arc-shaped, and the curvature radius R31a is about three times the wall thickness t3b of the cylindrical portion 3b of the bottomed cylindrical member 3. Since it is set, the pressing surface 31a can be pressed against the cylindrical portion 3b with a sufficient contact area, and can be suitably stretched.

<Example 3>
In this example, a method of obtaining a bottom disc-shaped bottomed cylindrical member having a disc-shaped enlarged diameter portion and a cylindrical portion from the bottomed cylindrical member obtained by the manufacturing method of Example 1 will be described. .

(1) Configuration of bottom disk-shaped bottomed cylindrical member 5 As shown in FIG. 16 (b), the bottom disk-shaped bottomed cylindrical member 5 according to this embodiment includes a disk-shaped enlarged diameter portion 5a and a cylinder. And a shaped portion 5b. In addition, the bottom disc-shaped bottomed cylindrical member 5 is formed with a bottomed hole 5c that opens to the end side on the cylindrical portion 5b side. As shown in FIGS. 16A and 16B, the cylindrical portion 5b has an outer diameter D5b substantially equal to the outer diameter D3b of the cylindrical portion 3b of the bottomed cylindrical member 3. The bottomed hole 5c has an inner diameter d5c that is substantially equal to the inner diameter d3c of the bottomed hole 3c of the bottomed cylindrical member 3, and the depth H5c of the bottomed hole 5c is the same as that of the bottomed cylindrical member 3. The size is substantially equal to the depth H3c of the bottom hole 3c.

(2) Manufacturing method of bottom disk-shaped bottomed cylindrical member Next, the manufacturing method of the said bottom disk-shaped bottomed cylindrical member is demonstrated.
In the present embodiment, by subjecting the bottomed cylindrical member 3 shown in FIG. 16 (a) to forging, the disk-shaped enlarged diameter portion 5a and the cylindrical portion 5b shown in FIG. 16 (b) are obtained. The bottom disk-shaped bottomed cylindrical member 5 provided is obtained. In this embodiment, the forging process employs hot forging. In this hot forging, as shown in FIG. 17, an upper die 41 having a flat convex portion 41a (illustrated as a first die according to the present invention) and a lower die in which a through hole 42a is formed. A mold 42 (illustrated as a second mold according to the present invention) and a round bar-shaped pin 43 (illustrated as a third mold according to the present invention) that is fixedly disposed in a state of being inserted into the through hole 42a from below. And). These molds are arranged from the top in the order of the upper mold 41, the lower mold 42 and the pins 43. The lower mold 42 is supported by a guide 45 so that the outer peripheral side thereof can move up and down, and is pressed by a fluid cylinder 46 from below. In this embodiment, the fluid cylinder 46 uses a fluid cylinder filled with nitrogen gas, which is a compressible fluid. A cylindrical knockout sleeve 44 is disposed between the through hole 42a and the pin 43 and can move up and down through the gap.

  In obtaining the bottom disk-shaped bottomed cylindrical member 5 from the bottomed cylindrical member 3, as shown in FIG. 18A, first, the bottomed cylindrical member 3 is inserted into the through hole 42 a of the lower mold 42. The upper mold 41 is lowered by inserting from the cylindrical portion 3b side. Then, as shown in FIG. 18 (b), the convex portion 41 a of the upper die 41 engages with the upper end side of the through hole 42 a of the lower die 42, and the bottomed cylindrical member 3 becomes the upper die 41. Pressed. When the upper die 41 is further lowered, as shown in FIG. 19A, the lower die 42 in a state of being combined with the upper die 41 is lowered together along the guide 45, and the bottomed cylindrical member 3 The pin 43 enters the bottomed hole 3c. When the tip of the pin 43 is lowered until it contacts the bottom wall of the bottomed hole 3c, the bottomed cylindrical member 3 starts to be compressed, as shown in FIG. It flows out into the space between the molds 42. Then, as shown in FIG. 20A, the upper mold 41 and the lower mold 42 reach the descending end, and the disk-shaped enlarged diameter portion 5a and the cylindrical portion 5b are formed.

  When the upper mold 41 is raised at the time of releasing, the lower mold 42 rises following the upper mold 41 by the pressing force of the fluid cylinder 46 as shown in FIG. On the other hand, the fixedly arranged pin 43 comes out of the bottomed hole 5c, thereby completing the release of the pin 43. When the upper die 41 is further raised and the lower die 42 that has been raised following the upper die 41 reaches the rising end, the upper die 41 and the lower die 42 are separated as shown in FIG. The engagement is released and the release of the upper mold 41 is completed. Finally, as shown in FIG. 21B, the knockout sleeve 44 is raised and released from the lower mold 42 to obtain the bottom disk-shaped bottomed cylindrical member 5.

  The bottom disc-shaped bottomed cylindrical member 5 obtained in this way has the diameter of the bottom side of the columnar portion 3a of the bottomed cylindrical member 3 expanded to a disc shape as shown in FIG. 16 (b). The disk-shaped enlarged diameter part 5a and the cylindrical part 5b integrally formed in the one end side of the disk-shaped enlarged diameter part 5a are provided. A bottomed hole 5c having an inner diameter d5c and a height H5c is formed on the cylindrical portion 5b side. Further, the cylindrical portion 5 b is formed so that the thickness t 5 b is substantially the same as the thickness t 3 b of the cylindrical portion 3 b of the bottomed cylindrical member 3. The height H5c of the bottomed hole 5c is substantially the same as the height H3c of the bottomed hole 3c of the bottomed cylindrical member 3.

(3) Effect of Example 3 As described above, in this example, the bottom of the columnar portion 3a of the bottomed cylindrical member 3 is expanded in a disc shape by hot forging. The diameter part 5a is formed. Thereby, the bottom disk-shaped bottomed cylindrical member 5 provided with the disk-shaped enlarged diameter part 5a and the cylindrical part 5b integrally formed with this disk-shaped enlarged diameter part 5a can be obtained easily.

  Further, the upper mold 41 for forming the bottom side surface shape of the disk-shaped enlarged portion 5a, the outer side surface shape of the cylindrical portion 5b, and the bottom side surface of the disk-like enlarged portion 5a. A disk-shaped enlarged diameter portion 5a and a cylindrical portion 5b using a lower die 42 for forming a surface shape other than the above and a pin 43 for forming a bottomed cylindrical inner surface shape of the cylindrical portion 5b. After that, the pin 43 is released first, so that the mold and the work are fixed compared to the case where the lower mold 42 and the pin 43 are released at the same time. It can be easily released without any problems.

  Further, the upper mold 41, the lower mold 42, and the pin 43 are arranged in this order from above, and the lower mold 42 is fixed in a direction opposite to the pressing direction of the upper mold 41 by the fluid cylinder 46. While being pressed by the pressing force, it can be translated in the pressing direction against the pressing force. Then, as a step of obtaining the bottom disk-shaped bottomed cylindrical member 5, first, the lower mold 42 and the lower mold 42 are lowered by lowering the upper mold 41 toward the lower mold 42 into which the bottomed cylindrical member 3 is inserted. The upper mold 41 is engaged, then the upper mold 41 is further lowered to press the lower mold 42, and the lower mold 42 and the upper mold 41 are lowered together, By engaging the pin 43, the lower mold 42 and the upper mold 41 with each other to form the disk-shaped enlarged diameter portion 5a and the cylindrical portion 5b, and then raising the upper mold 41, The lower mold 42 is raised together with the upper mold 41 in a state where the lower mold 42 is aligned with the upper mold 41, thereby releasing the pin 43. Thereby, the easy mold release which a metal mold | die and a workpiece | work are hard to adhere | attach with a simple structure is realizable.

<Example 4>
In this example, from the bottom disc-shaped bottomed cylindrical member obtained by the manufacturing method of Example 3, a bottom disc-shaped bottomed thin-walled stretch cylinder provided with a thin-walled stretched cylindrical portion and a disc-shaped enlarged diameter portion. A method for obtaining the shaped member will be described.

(1) Configuration of bottom disc-shaped bottomed thin-walled elongated cylindrical member The bottom-disc-shaped bottomed thin-walled stretched cylindrical member 6 according to the present embodiment is, as shown in FIG. A portion 6a and a thin-walled extending cylindrical portion 6b are provided. Further, the bottom disc-shaped bottomed thin-walled extending cylindrical member 6 is formed with a bottomed hole 6c that opens to the end side on the thin-walled extending cylindrical portion 6b side. As shown in FIGS. 22 (a) and 22 (b), the thin-drawn cylindrical portion 6b has an outer diameter D6b that is smaller than the outer diameter D5b of the cylindrical portion 5b of the bottomed disk-shaped bottomed cylindrical member 5. ing. The bottomed hole 6c has an inner diameter d6c that is substantially equal to the inner diameter d6c of the bottomed hole 6c of the bottomed disk-shaped bottomed cylindrical member 5, and its depth H6c has a bottom disk shape. The bottomed cylindrical member 5 is processed to be larger than the depth H5c of the bottomed hole 5c. Further, the thickness t6b of the thin-walled extending cylindrical portion 6b is smaller than the thickness t5b of the cylindrical portion 5b of the bottom disk-shaped bottomed cylindrical member 5. That is, in the bottom disk-shaped bottomed thin-walled cylindrical member 6 according to the present embodiment, the thin-walled cylindrical member 6b is thinner than the cylindrical part 5b of the bottom-disk-shaped bottomed cylindrical member 5. And the site | part extended | stretched to the axial direction is formed.

(2) Manufacturing method of bottom disk-shaped bottomed thin wall-stretched cylindrical member Next, the manufacturing method of the said bottom disk-shaped bottomed thin-walled thin-walled cylindrical member is demonstrated. In the present embodiment, spinning processing is performed on the bottom disk-shaped bottomed cylindrical member 5 obtained as described above. In this embodiment, the spinning process is cold spinning. In this cold spinning process, a process roller 51 and a chuck 52 are used as shown in FIG. The processing roller 51 has substantially the same configuration as the processing roller 31 of the second embodiment, and the center direction (x-axis direction in FIG. 23) and the axial direction (z-axis in FIG. 23) of the bottomed cylindrical member 3 serving as a workpiece. It is supported by a moving means (not shown) so as to be freely movable in the direction). Further, the processing roller 51 is rotatably supported around an axis in the z-axis direction. When the processing roller 51 is pressed against the outer peripheral surface of the rotating bottom disc-shaped bottomed cylindrical member 5, the processing roller 51 is rotated. To rotate. Further, the pressing surface 51a of the processing roller 51 has a substantially arc shape, and the radius of curvature R51a thereof is about 3 of the thickness t5b of the cylindrical portion 5b of the bottomed disk-shaped bottomed cylindrical member 5. It is set to double. Further, the outer diameter D51 of the processing roller 51 is set to about three times the outer diameter D5b of the cylindrical portion 5b of the bottom disc-shaped bottomed cylindrical member 5 serving as a workpiece.

  The chuck 52 fixedly supports the bottom disc-shaped bottomed cylindrical member 5 serving as a workpiece and can be rotated by a rotation driving means (not shown), whereby the workpiece can be rotated. In this embodiment, the bottom disc-shaped bottomed cylindrical member 5 is inserted into the bottomed hole 5c of the bottom disc-shaped bottomed cylindrical member 5, and the bottom disc-shaped bottomed cylindrical member 5 serving as a work is held by holding the bottom wall. Although the pin 53 is used, the holding pin 53 is only in contact with the bottom wall of the bottomed hole 5c, and is not in contact with the inner diameter side surface of the bottomed hole 5c. That is, in this embodiment, a processing tool such as a mold used in normal spinning is not used.

  In obtaining the bottom disk-shaped bottomed thin-walled elongated cylindrical member 6 from the bottom disk-shaped bottomed cylindrical member 5, first, as shown in FIG. 23, the bottom disk-shaped bottomed cylindrical member 5 is chucked 52. The pressing surface 51a of the processing roller 51 is pressed against the work. Then, as shown in FIG. 24 (a), the outer diameter of the portion of the cylindrical portion 5b against which the processing roller 51 is pressed is reduced to reduce the thickness.

  Then, when the processing roller 51 is moved in the z-axis direction in this state, the portion corresponding to the cylindrical portion 5b is extended in the axial direction and the processing roller 51 passes as shown in FIG. The thickness of the part will be reduced. Thereby, the thin-walled elongated cylindrical portion 6b that is thinner than the wall thickness t5b of the cylindrical portion 5b and is stretched in the axial direction is formed, and the bottom disk-shaped bottomed thin-walled elongated cylindrical member 6 is obtained.

  The bottom disk-shaped bottomed thin-walled elongated cylindrical member 6 obtained in this way is substantially the same as the disk-shaped enlarged diameter portion 5a of the bottom disk-shaped bottomed cylindrical member 5 as shown in FIG. A disk-shaped enlarged diameter portion 6a having the same shape, and a thin elongated cylindrical portion 6b having an outer diameter D6b smaller than the outer diameter D5b of the cylindrical portion 5b of the bottom disk-shaped bottomed cylindrical member 5 are provided. Also, a bottomed hole 6c having an inner diameter d6c and a height H6c is formed on the thin-walled extending cylindrical portion 6b side. Further, the thin elongated cylindrical portion 6b has a thickness t6b that is thinner than the thickness t5b of the cylindrical portion 5b of the bottom disc-shaped bottomed cylindrical member 5, and has a bottom disc-shaped bottom. The thin-walled elongated cylindrical member 6 has a substantially uniform thickness in the axial direction.

(3) Effect of Embodiment 4 As described above, in this embodiment, the shaft is formed so as to be thinner than the thickness of the cylindrical portion 5b of the bottom disk-shaped bottomed cylindrical member 5 by cold spinning. A thin-walled extending cylindrical portion 6b extending in the direction is formed. Thereby, compared with the case where the same thin extending | stretching cylindrical part is formed by a forge process, a thinner thin extending | stretching cylindrical part can be formed easily.

  Further, in the cold spinning process, the processing roller 51 is directed toward the extending direction while pressing the processing roller 51 against the outer diameter side surface of the cylindrical portion 5b of the rotated bottom disc-shaped bottomed cylindrical member 5. Is a process of forming the thin-walled elongated cylindrical part 6b by moving the tool, and during the process, the machining tool is not brought into contact with the surface on the inner diameter side of the cylindrical part 5b. Since a forming die that defines the inner diameter side surface is not required as in the case of processing, the number of processing tools can be reduced, and processing with a simple configuration can be realized.

  Furthermore, in this embodiment, the cross-sectional shape of the pressing surface 51a of the processing roller 51 is substantially arc-shaped, and the radius of curvature R51a is equal to the thickness t5b of the cylindrical portion 5b of the bottom disc-shaped bottomed cylindrical member 5. Since it is set to about 3 times, the pressing surface 51a can be pressed against the cylindrical portion 5b with a sufficient contact area, and can be suitably stretched.

  In addition, in this invention, it can be set as the Example variously changed within the range of this invention according to the objective and a use, without being restricted to the said Examples 1-4. That is, in the said Example, although the example provided with the cup-shaped enlarged diameter part 2b which the thickness t2b reduces as it goes to an edge part side was shown as the intermediate member 2, it is not limited to this, For example, it shows in FIG. Thus, it is good also as intermediate member 2 'provided with the cup-shaped enlarged diameter part 2b' which the wall thickness t2b 'increases as it goes to an edge part side. An example of a method for manufacturing such an intermediate member 2 ′ will be described below with reference to FIGS. 26 to 30.

  The intermediate member 2 ′ is obtained by forging the material 1 as in the first embodiment. In this forging process, as shown in FIG. 26, the upper mold 11 ′ having a convex portion 11 a ′ for forming the inner wall shape of the cup-shaped enlarged diameter portion 2 b ′ and the material 1 are held, and the cup shape A lower mold 12 ′ having a concave portion 12a ′ for forming the outer wall shape of the enlarged diameter portion 2b ′ is used. FIG. 26 shows the upper mold 11 and the lower mold 12 used for obtaining the intermediate member 2 in the first embodiment in the left half, and the upper mold 11 ′ used for obtaining the intermediate member 2 ′ in the right half and A lower mold 12 'is shown. As shown in the figure, the concave portion 12a ′ is formed such that the inner wall thereof is reduced in diameter from a position lower than the inner wall of the concave portion 12a of the first embodiment, and the diameter thereof is steeper than that of the concave portion 12a. It is formed to do. The convex portion 11a ′ has substantially the same shape as the convex portion 11a of the first embodiment, but the growth suppressing portion 11c ′ provided on the proximal end side of the convex portion 11a ′ It is provided at a position lower than the growth suppressing portion 11c of Example 1.

  In obtaining the intermediate member 2 ′ from the material 1, first, as shown in FIG. 27, the material 1 is inserted into the concave portion 12 a ′ of the lower mold 12 ′, the upper mold 11 ′ is lowered, and the material 1 is The convex portion 11a ′ is pressed and pressurized. Then, as shown in FIGS. 28A to 28C, the material 1 is compressed by the convex portion 11 a ′, the meat of the material 1 is pushed out, and flows out obliquely backward with respect to the pressurizing direction. At this time, the gap between the convex portion 11a ′ and the concave portion 12a ′ is formed so as to open more widely on the outside as compared with the first embodiment, so that the material 1 extruded by the convex portion 11a ′ Meat flows out more outwardly than in Example 1 above. Then, as shown in FIG. 29, when the upper mold 11 'reaches the descending end, the formation of the cup-shaped enlarged diameter portion 2b' is completed. Finally, as shown in FIG. 30, the upper mold 11 ′ is raised and the knockout pin 13 is raised and released to obtain the intermediate member 2 ′.

  The intermediate member 2 ′ thus obtained is formed such that the cup-shaped enlarged diameter portion 2 b ′ increases as the thickness t <b> 2 b ′ increases toward the end portion. In this way, the cup-shaped enlarged diameter portion 2b ′ is formed so that the wall thickness t2b ′ increases toward the end portion side, so that the forging process has a smaller deformation resistance than the first embodiment. Can be realized. Further, since the meat of the material 1 pushed out by the convex portion 11a ′ flows out obliquely rearward at a larger angle with respect to the outer side direction, that is, the pressurizing direction as compared with the first embodiment, In comparison, processing with a smaller pressure can be realized. Furthermore, since the wall thickness t2b ′ increases toward the end side, compared with the first embodiment, the flow of the meat on the upper side is reduced, and the convex portion 11a ′ of the upper mold 11 ′. And the flow of meat and the amount of friction can be reduced. As a result, the wear of the mold can be suppressed and the mold life can be further improved.

  Moreover, in the said Example 3, although the bottom part disk-shaped bottomed cylindrical member 5 provided with the disk-shaped enlarged diameter part 5a as shown in FIG.16 (b) was obtained by forge processing, it is limited to this. For example, as shown in FIG. 31 (a), a bottom circle having a disk-shaped enlarged portion 5a ′ formed so as to increase in diameter from the cylindrical portion 5b ′ side toward the end portion side. You may make it obtain plate-shaped bottomed cylindrical member 5 '. Furthermore, in the forging process, the cylindrical portion 3b of the bottomed cylindrical member 3 may be formed with a cylindrical portion 5b 'extended in the axial direction.

  Further, as shown in FIG. 31 (a), by forging the bottomed cylindrical member 3, the bottom side of the columnar portion 3a is enlarged in a disc shape, and as it goes toward the end side. A disc-shaped enlarged portion 5a ′ formed so as to expand, and a cylindrical portion formed integrally with one end of the disc-like enlarged portion 5a ′ and having the cylindrical portion 3b extended in the axial direction. 5b ′ may be formed to obtain a bottom disk-shaped bottomed cylindrical member 5 ′ including the disk-shaped enlarged diameter portion 5a ′ and the cylindrical portion 5b ′.

  Furthermore, by spinning the cylindrical portion 5b ′ of the bottom disc-shaped bottomed cylindrical member 5 ′ obtained in this way, as shown in FIG. 31 (b), the thickness of the cylindrical portion 5b ′ is increased. A thin-stretched cylindrical portion 6b ′ that is stretched in the axial direction so as to be thinner than t5b ′ is formed, and is formed integrally on one end side of the thin-stretched cylindrical portion 6b ′ and the thin-stretched cylindrical portion 6b ′. You may make it obtain bottom part disk-shaped bottomed thin-walled extending | stretching cylindrical member 6 'provided with the disk-shaped enlarged diameter part 6a'.

  Moreover, in the said Example 2 and 4, although the example which uses the one processing roller 31 and 51 in the spinning process was shown, it is not limited to this, For example, as shown to Fig.31 (a) and (b) In addition, a plurality of processing rollers may be used. In this case, as shown in FIGS. 31A and 31B, a plurality of processing rollers may be arranged in the circumferential direction of the workpiece, or may be arranged in the axial direction. Further, when a plurality of processing rollers are arranged in the circumferential direction of the workpiece, as the pressing form, as shown in FIG. 32A, the processing rollers 31, 51 are pressed toward the center of the workpiece, respectively. As shown in FIG. 32 (b), the pressing can be performed so that the pressing directions of the processing rollers 31 and 51 are parallel to each other.

  It is widely used as a technique for producing a bottomed cylindrical member, a bottomed disk-shaped bottomed cylindrical member, a bottomed thin-walled elongated cylindrical member, and a bottom disk-shaped bottomed thin-walled elongated cylindrical member. In particular, it is suitably used as a technique for producing these members from difficult-to-process materials.

  DESCRIPTION OF SYMBOLS 1; Raw material, 2 and 2 '; Intermediate member, 2a; Cylindrical part, 2b, 2b'; Cup-shaped enlarged diameter part, 2c; Bottomed hole, 3; Bottomed cylindrical member, 3a; Cylindrical part, 3c; bottomed hole, 4; bottomed thin-walled cylindrical member, 4a; columnar part, 4b; thin-walled cylindrical part, 4c; bottomed hole, 5,5 '; Bottomed cylindrical member, 5a, 5a ′; disk-shaped expanded diameter portion, 5b, 5b ′; cylindrical portion, 5c; bottomed hole, 6, 6 ′; 6a, 6a '; disk-shaped expanded diameter part, 6b, 6b'; thin-walled extended cylindrical part, 6c; bottomed hole, 11, 11 '; upper mold, 11a, 11a'; convex part, 11b; Guide part, 11c, 11c '; Growth restraint part, 12, 12'; Lower mold, 12a, 12a '; Recessed part, 12b; Guide part, 13; Knockout pin, 21; Upper mold, 21a; 21b; Air hole, 22; Lower mold, 22a; Through hole, 31; Processing roller, 31a; Pressing surface, 32; Chuck, 41; Upper mold, 41a; Convex part, 42; Through-hole, 43; pin, 44; knockout sleeve, 45; guide, 46; fluid cylinder, 51; processing roller, 51a; pressing surface, 52; chuck, 53;

Claims (11)

By forging a solid columnar material, a cup-shaped expanded portion that is expanded in a cup shape toward the end on one end side of the material is formed, and the cup-shaped expanded portion and the cup-shaped expanded portion are formed. Obtaining an intermediate member comprising a cylindrical portion integrally formed on the small diameter side of the diameter portion;
The cup-shaped widened portion of the intermediate member is ironed to form a cylindrical portion in which the cup-shaped widened portion is processed into a cylindrical shape, and is integrated with the cylindrical portion and one end side of the cylindrical portion. And a step of obtaining a bottomed cylindrical member having a columnar portion formed on the bottom. A method for manufacturing a bottomed cylindrical member, comprising:   A thin-walled cylindrical portion that is stretched in the axial direction so as to be thinner than the thickness of the cylindrical portion by spinning the cylindrical portion of the bottomed cylindrical member manufactured by the manufacturing method according to claim 1. And forming a bottomed thin-walled stretched cylindrical member comprising a thin-walled stretched cylindrical portion and a columnar portion integrally formed on one end side of the thin-walled stretched cylindrical portion. Manufacturing method of bottom thin-walled stretched cylindrical member.   The spinning process moves the processing roller in the extending direction while pressing the outer diameter side surface of the processing roller against the outer diameter side surface of the cylindrical portion of the rotated bottomed cylindrical member. 3. A bottomed thin wall according to claim 2, which is a process of forming a thin-walled elongated cylindrical portion by causing the processing tool to not contact a surface on the inner diameter side of the cylindrical portion during the processing. A method for producing a stretched cylindrical member.   A disk-shaped diameter-enlarged portion is formed by forging the bottomed cylindrical member manufactured by the manufacturing method according to claim 1, wherein the bottom side of the columnar portion is expanded in a disk shape, and the disk shape A bottom disk-shaped cylindrical member comprising a step of obtaining a bottom disk-shaped bottomed cylindrical member having a diameter-enlarged portion and a cylindrical portion integrally formed on one end side of the disk-shaped diameter-enlarged portion. Manufacturing method of bottom cylindrical member. In the step of obtaining the bottom disk-shaped bottomed cylindrical member, the first mold for forming the bottom-side surface shape of the disk-shaped enlarged diameter portion, and the surface shape of the cylindrical portion on the outer surface side And a second mold for forming a surface shape other than the surface on the bottom side of the disk-shaped enlarged diameter portion, and a third mold for forming a bottomed cylindrical inner surface shape of the cylindrical portion, The disk-shaped enlarged diameter portion and the cylindrical portion are formed using
5. The method of manufacturing a bottomed disc-shaped bottomed cylindrical member according to claim 4, wherein the third mold is first released from the mold.   The bottom part disk-shaped bottomed cylindrical member manufactured by the manufacturing method according to claim 4 or 5 is stretched in the axial direction so as to be thinner than the thickness of the cylindrical part by spinning the cylindrical part. A bottom-disc-shaped bottomed thin-walled extending cylinder comprising a thin-walled extending cylindrical portion and a thin-walled extending cylindrical portion and a disk-shaped enlarged diameter portion integrally formed on one end side of the thin-walled extending cylindrical portion. The manufacturing method of the bottom part disk-shaped bottomed thin-walled extending | stretching cylindrical member characterized by including the process of obtaining a cylindrical member.   The spinning process is performed in the direction of stretching while pressing the outer diameter side surface of the processing roller against the outer diameter side surface of the cylindrical part of the rotated bottom disc-shaped bottomed cylindrical member. 7. The process of forming a thin stretched cylindrical part by moving a roller, wherein the machining tool is not brought into contact with the inner diameter side surface of the cylindrical part during the process. A method for producing a bottomed disk-like bottomed thin-walled elongated cylindrical member.   A bottomed cylindrical member manufactured by the manufacturing method according to claim 1.   A bottomed thin-walled elongated cylindrical member produced by the production method according to claim 2 or 3.   A bottom disc-shaped bottomed cylindrical member manufactured by the manufacturing method according to claim 4 or 5.   A bottom disk-shaped bottomed thin-walled cylindrical member manufactured by the manufacturing method according to claim 6 or 7.

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