JP2015112626A - Molding method of elliptic cylindrical body and molding apparatus of elliptic cylindrical body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten a time required for molding furthermore than hitherto, in a molding method of an elliptic cylindrical body for molding a part of the elliptic cylindrical body into a cylindrical shape by spinning.SOLUTION: A molding method of an elliptic cylindrical body for molding a part of the elliptic cylindrical body 9 into a cylindrical shape by spinning has a first molding step for molding the part of the elliptic cylindrical body 9 into the cylindrical shape by using an inside roller 11, and a second molding step for molding a portion molded into the cylindrical shape in the first molding step, further into a cylindrical shape having a reduced diameter by using an outside roller 17.

Description

  The present invention relates to a method for forming an elliptical cylindrical body and a molding apparatus for an elliptical cylindrical body, and more particularly to a method for forming a part of an elliptical cylindrical body into a cylindrical shape.

  Conventionally, when the diameter of an end of an elliptical cylinder (work) 301 is reduced to a desired cylindrical shape by spinning, a roller 303 is moved from the outside of the elliptical cylinder 301 as shown in FIG. It is in contact.

  However, in this molding method, since the roller 303 can only rotate at a constant diameter, idling occurs at the short diameter portion of the elliptical cylindrical body 301 (see FIG. 11B). In other words, since the distance between the rotation center axis of the elliptical cylinder 301 and the rotation center axis of the roller 303 cannot be changed rapidly, the roller 303 has a long diameter portion of the elliptic cylinder 301 when molding is started. However, it does not contact the short-diameter portion, but idles at the short-diameter portion.

  As a result, it takes too much time to reduce the diameter of the elliptical cylindrical body 301 by spinning, making mass production difficult.

  Therefore, a molding method is known that shortens the molding time when the end of the elliptical cylinder 301 is reduced in diameter to obtain a desired cylindrical shape (see, for example, Patent Document 1).

  In the molding method shown in Patent Document 1, after the mold 305 is inserted into the end 309 of the elliptical cylindrical body 301 and the end 309 of the elliptical cylindrical body 301 is molded into a cylindrical shape (see FIGS. 8 and 9). The cylindrical portion 309a having a reduced diameter is formed by spinning the end 309 of the elliptical cylindrical body 301 formed into a cylindrical shape by a roller 307 (see FIG. 10).

JP 2002-66665 A

  By the way, if the molding method described in Patent Document 1 is used, the molding time of the end 309 of the elliptical cylindrical body 301 is reduced to some extent, but after the molding using the mold 305 is completed, the molding is performed by spinning. (Molding in two steps) and time required for changing the shape of the elliptical cylindrical body 301 are required, so it takes time to reduce the diameter of the end 309 of the elliptical cylindrical body 301. There is a problem.

  The present invention has been made in view of the above problems, and in the method for forming an elliptic cylinder and a molding apparatus for an elliptic cylinder, a part of the elliptic cylinder is formed into a cylindrical shape by spinning. An object of the present invention is to provide an apparatus that can shorten the time required for molding as compared with the conventional technique.

  According to a first aspect of the present invention, there is provided a method for forming an elliptical cylindrical body in which a part of an elliptical cylindrical body is formed into a cylindrical shape by spinning, and the elliptical cylindrical body is cylindrically formed using an inner roller. And a second forming step of forming a cylindrical portion obtained by reducing the diameter of the cylindrical portion formed by the first forming step using an outer roller. This is a molding method.

  According to a second aspect of the present invention, in the method of forming an elliptical cylindrical body according to the first aspect, the molding in the second molding step is slightly delayed in time than the molding in the first molding step. This is a method for forming an elliptical cylindrical body.

  According to a third aspect of the present invention, there is provided a method for forming an elliptical cylindrical body in which a part of an elliptical cylindrical body is formed into a cylindrical shape by a spinning process. A first molding step for molding into a cylindrical shape, and a second molding step for molding the portion made cylindrical by the first molding step into a cylindrical shape having a reduced diameter using the outer roller. This is a method of forming an elliptic cylinder.

  According to a fourth aspect of the present invention, in the method for forming an elliptical cylindrical body according to the third aspect, in the first molding step, the inner roller and the outer roller are connected to a central axis of the elliptical cylindrical body. This is a method for forming an elliptical cylindrical body that moves in the stretching direction and forms the short-diameter portion of the elliptical cylindrical body and a portion near it.

  Invention of Claim 5 is the shaping | molding method of the elliptic cylindrical body of any one of Claims 1-4. WHEREIN: The said outer side roller is provided in the same installation as the said inner side roller, The first forming step and the second forming step are methods for forming an elliptical cylinder that performs the forming with the same equipment.

  A sixth aspect of the present invention is the method for forming an elliptical cylindrical body according to any one of the first to fifth aspects, wherein the inner roller is longer than the outer roller. Is the method.

  The invention according to claim 7 is the method for forming an elliptic cylindrical body according to any one of claims 1 to 6, wherein the processing region of the outer roller used in the second forming step is: It is a shaping | molding method of the elliptical cylinder currently longer than the process area | region of the inner side roller used at a said 1st shaping | molding process.

  According to an eighth aspect of the present invention, there is provided an apparatus for forming an elliptical cylinder that forms a part of an elliptical cylinder into a cylindrical shape by a spinning process, wherein the elliptical cylinder is located inside the elliptical cylinder. An inner roller that forms a part of the body into a cylindrical shape, and an outer roller that is located outside the elliptical cylindrical body and that is formed into a cylindrical shape with a reduced diameter at a portion that is made cylindrical by the inner roller. An apparatus for forming an elliptic cylinder.

  The invention according to claim 9 is configured such that the molding by the outer roller is performed slightly later than the molding by the inner roller in the apparatus for molding an elliptical cylinder according to claim 8. The apparatus for forming an elliptical cylindrical body.

  According to a tenth aspect of the present invention, there is provided an apparatus for forming an elliptical cylindrical body that forms a part of an elliptical cylindrical body into a cylindrical shape by a spinning process, wherein the elliptical cylindrical body is located inside the elliptical cylindrical body. An inner roller that forms a part of the body into a cylindrical shape, and an outer roller that is located outside the elliptical cylinder and forms a part of the elliptical cylinder into a cylindrical shape. A part of a cylindrical body is formed into a cylindrical shape by using the inner roller and the outer roller at the same time, and then the cylindrical portion is formed into a cylindrical shape having a reduced diameter by using the outer roller. This is an elliptical cylindrical body forming apparatus.

  The eleventh aspect of the present invention is the apparatus for forming an elliptical cylindrical body according to the tenth aspect, wherein the inner roller and the outer roller are moved in the extending direction of the central axis of the elliptical cylindrical body, An apparatus for forming an elliptical cylindrical body configured to form a short diameter portion of an elliptical cylindrical body and a portion in the vicinity thereof into a cylindrical shape.

  According to a twelfth aspect of the present invention, there is provided an apparatus for forming an elliptical cylindrical body according to any one of the eighth to eleventh aspects, wherein the inner roller is longer than the outer roller. It is.

  According to a thirteenth aspect of the present invention, in the apparatus for forming an elliptical cylindrical body according to any one of the eighth to twelfth aspects, the processing region of the outer roller is longer than the processing region of the inner roller. This is an apparatus for forming an elliptical cylindrical body.

  According to the present invention, in the method for forming an elliptical cylinder and a molding apparatus for the elliptical cylinder, in which a part of the elliptical cylinder is formed into a cylindrical shape by spinning, the time required for the above-mentioned molding is made shorter than before. There is an effect that can be.

It is a figure which shows the product (semi-finished product) shape | molded by the shaping | molding method of the elliptic cylinder which concerns on embodiment of this invention. It is II arrow directional view in FIG. It is a figure which shows schematic structure of the shaping | molding apparatus of the elliptical cylinder which concerns on embodiment of this invention. It is IV arrow line view in FIG. FIG. 4 is a view taken in the direction of arrow V in FIG. 3. It is a figure which shows the 1st shaping | molding process in the shaping | molding method of the elliptical cylinder which concerns on embodiment of this invention. It is a figure which shows the 2nd shaping | molding process in the shaping | molding method of the elliptical cylinder which concerns on embodiment of this invention. It is a figure which shows the conventional shaping | molding method. It is a figure which shows the conventional shaping | molding method. It is a figure which shows the conventional shaping | molding method. It is a figure which shows the conventional shaping | molding method.

  A product (semi-finished product) 1 molded by the method of molding an elliptical cylinder according to an embodiment of the present invention is used, for example, in an exhaust gas converter or a muffler of an automobile. The main body part 3, the intermediate part 5, and the end part 7 are provided and formed in a cylindrical shape (see FIGS. 1 and 2).

  In the product 1, an end portion of an elliptical cylindrical body (cylindrical body having a cross section perpendicular to the central axis is an elliptical shape) 9 (see FIG. 4 and the like) is formed into a cylindrical shape (substantially cylindrical shape) by spinning. It is manufactured by molding.

  The main body 3 is not processed, and the main body 3 maintains the shape of the elliptical cylindrical body 9. For example, the end 7 is formed in a cylindrical shape whose outer diameter is smaller than the short diameter (short inner diameter) of the main body 3. The intermediate part 5 is located between the main body part 3 and the end part 7. The cross-sectional shape of the intermediate portion 5 (the cross-sectional shape by a plane orthogonal to the central axis) shifts from the cross-sectional shape of the main body portion 3 to the cross-sectional shape of the end portion 7 from the main body portion 3 side toward the end portion side. As shown, the shape is gradually changing. Further, the central axis of the main body 3, the central axis of the intermediate portion 5, and the central axis of the end portion 7 coincide with each other.

  Here, a method for forming the elliptical cylindrical body 9 will be described in detail.

  First, the end of the elliptical cylinder 9 is formed into a cylindrical shape (substantially cylindrical) using an inner roller 11 (a roller located inside the elliptical cylinder 9) (see FIG. 6; first molding step). ). Thereby, the large diameter cylindrical part 13 shape | molded by the cylindrical shape is formed in the edge part of the elliptical cylinder 9 (refer FIG.6, FIG.9, FIG.10).

  The outer diameter of the large-diameter cylindrical portion 13 is smaller than the inner diameter of the elliptical cylindrical body 9 and larger than the shorter outer diameter of the elliptical cylindrical body 9. The diameter may be larger than the inner diameter or outer diameter of the major axis of the elliptical cylindrical body 9.

  Subsequently, the portion (large-diameter cylindrical portion) 13 that has been formed into a cylindrical shape by the first molding step is used as the first roller by using an outer roller (for example, a pair of rollers positioned outside the elliptical cylindrical body 9) 17. A cylindrical shape (substantially cylindrical) having a diameter smaller than that of the portion 13 formed into a cylindrical shape by the molding process is formed (see FIGS. 1, 2, and 7; second molding process). Thereby, the product 1 is generated.

  More specifically, the outer diameter of the end portion 7 formed into a cylindrical shape by reducing the diameter is smaller than the inner diameter of the major axis of the elliptic cylinder 9 and smaller than the minor diameter of the elliptic cylinder 9 in FIG. However, for example, the outer roller 17 continues to perform spinning processing continuously thereafter, so that the product 1 shown in FIGS. 1 and 2 (the outer diameter of the end 7 is the elliptical cylindrical body 9). A product 1) with a shorter outer diameter or smaller inner diameter is produced.

  Further, the molding in the second molding step may be performed with a slight delay in time compared to the molding in the first molding step.

  More specifically, as shown in FIG. 3 and FIG. 5, one end (left end) of the inner roller 11 is extended in the extending direction of the central axis of the elliptical cylindrical body 9 (FIG. 5) before the first molding step is started. In the left-right direction), and the outer roller 17 is located at a predetermined distance from the one end (right end) of the oval cylindrical body 9 to the other end side (left end side). 9 in the extending direction of the central axis 9, located from one end (right end) of the elliptical cylindrical body 9 to the other end side (left end side) further away from one end (left end) of the inner roller 11. Yes. That is, in FIG. 5, the outer roller 17 is positioned on the left side of the inner roller 11 at the elliptical cylindrical body 9.

  Further, one end (left end) of the inner roller 11 in the extending direction of the central axis of the inner roller 11 and one end (right end) of the outer roller 17 in the extending direction of the central axis of the outer roller 17 are a predetermined slight amount. It is separated by a certain distance L1.

  The molding by the inner roller 11 in the first molding step is performed by bringing the inner roller 11 into contact with the inner wall of the elliptical cylinder 9 and rotating the inner roller 11 while the elliptical cylinder 9 is rotated around the central axis. 11 is moved to one end side (right side) in the extending direction of the central axis of the elliptical cylindrical body 9.

  The molding by the outer roller 17 in the second molding step is performed by bringing the outer roller 17 into contact with the outer wall of the elliptical cylinder 9 and rotating the outer roller while the elliptical cylinder 9 is rotated around the central axis. 17 is moved to one end side (right side) in the extending direction of the central axis of the elliptical cylindrical body 9. At this time, the outer roller 17 maintains a substantially constant distance from the inner roller 11 at substantially the same speed as the inner roller 11 (for example, the same distance L1 as the distance before the first molding step is started). While keeping it), it moves so as to follow the inner roller 11.

  Thereby, the processing region of the outer roller 17 used in the second molding step in the extending direction of the central axis of the elliptical cylindrical body 9 is more than the processing region of the inner roller 11 used in the first molding step. It is getting longer. And the intermediate part 5 can be shape | molded in an exact shape.

  The outer roller 17 is provided in the same equipment (equipment used for spinning processing; molding apparatus for elliptical cylindrical body) 21 as the inner roller 11, and the first molding process and the second molding process are performed by a molding apparatus. 21 is formed. Further, the inner roller 11 is longer than the outer roller 17 as shown in FIGS. 3 and 5.

  More specifically, in the state before the first molding step is started, the end (left end) of the inner roller 11 in the extending direction of the central axis of the inner roller 11 (left and right direction in FIG. 5) is one of the elliptical cylinders 9. Is located at a predetermined distance from the end (right end) to the other end side (left side), and in the state before the first molding step starts, the direction of extension of the central axis of the inner roller 11 The opposite end (right end) of the inner roller 11 is slightly protruding rightward from one end (right end) of the elliptical cylindrical body 9. Thereby, a part of the inner roller 11 (most part on the left side) enters the inside of the elliptical cylindrical body 9. The inner roller 11 may enter the inside of the elliptical cylinder 9 over the entire length, and the right end of the inner roller 11 may not protrude from the right end of the elliptical cylinder 9.

  Compared to the length of the inner roller 11 (dimension in the extending direction of the central axis; dimension in the horizontal direction in FIG. 5), the length of the outer roller 17 (dimension in the extending direction of the central axis; dimension in the horizontal direction in FIG. 5) Is getting shorter.

  Note that the length of the inner roller 11 may be shortened to be approximately the same as the length of the outer roller 17. Even in this case, the dimension L1 (see FIG. 5) in the first molding step is maintained.

  According to the molding method of the elliptical cylindrical body 9, after the end portion of the elliptical cylindrical body 9 is molded by the inner roller 11 in the first molding step, the cylindrical portion (large-diameter cylindrical portion 13) is formed. In the second molding step, since the outer roller 17 is used to form a cylindrical shape having a reduced diameter, it is not necessary to replace the elliptical cylinder 9 as compared with the case where a conventional mold is used, and one step is omitted. The time required for molding can be made shorter than before.

  Further, according to the molding method of the elliptical cylindrical body 9, a dedicated mold is not required, and the shape of the product 1 (the size and shape of the elliptical cylindrical body 9, the cylindrical shape of the end 7 of the elliptical cylindrical body 9) Even if the size or shape is changed, it can be flexibly handled at low cost without making an investment such as manufacturing a separate mold.

  Further, according to the molding method of the elliptical cylindrical body 9, the end of the elliptical cylindrical body 9 is applied in a manner in which a tensile stress is applied to the end of the elliptical cylindrical body 9 without applying a compressive stress in the first molding step. After forming into a cylindrical shape, the outer roller 17 continuously abuts on the outer periphery of the end of the elliptical cylindrical body 9 in the second forming step, and the diameter is reduced, so that the spinning process is rapidly advanced in the first forming step. However, a phenomenon such as buckling due to compressive stress does not occur, and the time required for molding can be shortened as compared with the conventional case where the end of the elliptical cylindrical body 9 is suddenly reduced in diameter to a cylindrical shape. . As a result, the cost during molding can be reduced, and mass production is facilitated.

  Further, according to the molding method of the elliptical cylindrical body 9, the molding in the second molding step is performed with a slight delay with respect to the molding in the first molding step. 17 is immediately formed, and when the inner roller 11 makes the end of the elliptical cylinder 9 cylindrical, the diameter of the outer roller 17 is reduced almost simultaneously. Thereby, the time for reducing the diameter of the end of the elliptical cylindrical body 9 into a cylindrical shape can be further shortened.

  Further, according to the molding method of the elliptical cylindrical body 9, since the outer roller 17 is provided in the same equipment as the inner roller 11, the process is changed (from the first molding process to the second molding process). When the elliptical cylindrical body 9 is not transported, the time required for reducing the diameter of the end of the elliptical cylindrical body 9 into a cylindrical shape can be further shortened.

  Moreover, according to the molding method of the elliptical cylindrical body 9, since the outer roller 17 is provided in the same equipment as the inner roller 11, there are equipment for performing the first molding process and equipment for performing the second molding process. A single piece of equipment is provided, and the spinning equipment for reducing the diameter of the end of the elliptical cylindrical body 9 into a cylindrical shape can be simplified.

  Further, according to the molding method of the elliptical cylindrical body 9, the inner roller 11 is longer than the outer roller 17, so that the contact length between the elliptical cylindrical body 9 and the inner roller 11 in the first molding step is set. The molding time can be increased, and the molding time in the first molding process can be further shortened.

  By the way, in the molding method of the elliptical cylindrical body 9, the end of the elliptical cylindrical body 9 may be molded into a cylindrical shape using the inner roller 11 and the outer roller 17 simultaneously in the first molding step.

  More specifically, in the first molding step, the end of the elliptical cylinder 9 is formed into a cylindrical shape by simultaneously applying the inner roller 11 and the outer roller to the end of the elliptical cylinder 9 from the inside and the outside. You may make it do. At this time, the short diameter of the elliptic cylinder 9 is enlarged from the inside of the elliptic cylinder 9 by the inner roller 11, and the long diameter of the elliptic cylinder is reduced by the outer roller 17 from the outside of the elliptic cylinder 9.

  Subsequently, in the second molding step, a portion (large-diameter cylindrical portion 13) made cylindrical by the first molding step using the inner roller 11 and the outer roller 17 at the same time is used by using the outer roller 17. Molded into a reduced diameter cylindrical shape.

  More specifically, as shown in FIGS. 3 and 5 as described above, the state before the first molding step is started.

  Molding (diameter expansion) by the inner roller 11 and the outer roller 17 in the first molding process using the inner roller 11 and the outer roller 17 at the same time is performed while the elliptical cylindrical body 9 is rotated. Is moved to one end side (right side) in the extending direction of the central axis of the elliptical cylindrical body 9 while being in contact with the inner wall of the elliptical cylindrical body 9, particularly the inner wall of the short diameter part or its peripheral part, The roller 17 is brought into contact with the outer wall of the elliptical cylindrical body 9, particularly the outer wall of the major axis or its peripheral part, and the inner roller 11 is placed on one end side (right side) in the extending direction of the central axis of the elliptical cylindrical body 9. Is moved by following the inner roller 11 while keeping the distance L1 between the inner roller 11 and the inner roller 11 substantially constant.

  In addition, although the inner roller 11 contacts the inner wall of the elliptical cylindrical body 9, the abutted portion gradually becomes wider as the end of the elliptical cylindrical body 9 approaches the cylindrical shape. Similarly, the outer roller 17 abuts against the outer wall of the elliptical cylindrical body 9, and the abutted portion gradually becomes wider as the end of the elliptical cylindrical body 9 approaches the cylindrical shape.

  The outer roller 17 is located at the same position as the inner roller 11 in the extending direction of the central axis of the elliptical cylindrical body 9 (left-right direction in FIG. 5) before the first molding step described above is started. Alternatively, it may be positioned on one end side (right side) in the extending direction of the central axis of the elliptical cylindrical body 9 with respect to the inner roller 11.

  Molding by the outer roller 17 in the second molding step is required for the outer roller 17 to be in a position different from the position before the first molding step or the position before the first molding step begins. Then, the outer roller is brought into contact with the outer wall of the elliptical cylindrical body 9, and the outer roller 17 is placed on one end side (right side) in the extending direction of the central axis of the elliptical cylindrical body 9. Is done by moving.

  Further, another outer roller (second outer roller provided in the same facility as the first outer roller 17; not shown) different from the outer roller (first outer roller) 17 described above is used. Two molding steps may be performed.

  In this case, in a state before the first molding step is started, the second outer roller is moved from one end in the extending direction of the central axis of the elliptical cylindrical body 9 to the other end side (left side). The first outer roller 17 is further away from the first outer roller 17.

  The molding by the second outer roller in the second molding step is such that the second outer roller is brought into contact with the outer wall of the elliptical cylindrical body 9 and one end in the extending direction of the central axis of the elliptical cylindrical body. On the side (right side), for example, the inner roller 11 and the first outer roller 17 are kept at a substantially constant distance from the inner roller 11 and the first outer roller 17 while keeping the distance between the inner roller 11 and the first outer roller 17 substantially constant. This is done by moving to follow the outer roller 17.

  According to the molding method of the elliptical cylindrical body 9 made in this way, the end of the elliptical cylindrical body 9 is molded into a cylindrical shape using the inner roller 11 and the outer roller 17 simultaneously in the first molding step. The spinning process in the first molding step can be advanced more quickly, and the time required for molding can be further shortened.

  In the above description, the end in the extending direction of the central axis of the elliptical cylindrical body 9 is formed using the rollers 11 and 17, but a spinning tool such as a spatula is used instead of the rollers 11 and 17. Then, molding may be performed. In the above description, the end of the elliptical cylindrical body 9 is formed, but other parts (parts) such as an intermediate part of the elliptical cylindrical body 9 may be molded.

  The above-described molding method of the elliptic cylinder 9 is performed by, for example, the molding apparatus 21 shown below.

  As shown in FIGS. 3 to 5, the oval cylindrical body forming apparatus 21 includes an inner roller 11 and an outer roller 17. And as above-mentioned, the inner side roller 11 is located inside the elliptical cylinder 9, and shape | molds the edge part of the elliptical cylinder 9 in a cylindrical shape. The outer roller 17 is positioned outside the elliptical cylindrical body 9 and is formed into a cylindrical shape having a reduced diameter at a portion made cylindrical by the inner roller 11.

  Further, the molding apparatus 21 is provided with a control unit (not shown) in which an elliptical cylinder installation unit 23, an inner roller installation unit 25, and an outer roller installation unit 27 include a CPU.

  The elliptical cylinder 9 installed in the elliptical cylinder installation part 23 rotates (autorotates) around this central axis. The inner roller 11 installed in the inner roller installation unit 25 rotates (autorotates) around the central axis and is orthogonal to the central axis (for example, a direction orthogonal to the paper surface of FIG. 5). And can be moved and positioned freely in the extending direction of the central axis (left-right direction in FIG. 5). The outer roller 17 installed on the outer roller installation portion 27 rotates (rotates) around the central axis, and a direction perpendicular to the central axis (for example, the vertical direction in FIG. 5) and the central axis It is possible to move and position freely in the extending direction (left and right direction in FIG. 5).

  The extending direction of the central axis of the elliptical cylindrical body 9 installed in the elliptical cylindrical installation part 23, the extending direction of the central axis of the inner roller 11 installed in the inner roller installing part 25, and the outer roller installing part 27 The extending directions of the central axes of the installed outer rollers 17 coincide with each other.

  Further, the molding apparatus 21 performs an operation for executing the above-described molding method of the elliptical cylinder 9 under the control of the control unit by an operation program stored in advance in the memory of the control unit. ing. At this time, the molding of the elliptical cylindrical body 9 by the rollers 11 and 17 is continued while maintaining the state where the elliptical cylindrical body 9 is installed in the elliptical cylindrical body installation part 23 as already understood. Made.

9 Oval cylindrical body 11 Inner roller 17 Outer roller 21 Molding device

Claims (13)

In the method of forming an elliptical cylinder, a part of the elliptical cylinder is formed into a cylindrical shape by spinning,
A first molding step of molding a part of the elliptical cylinder into a cylindrical shape using an inner roller;
A second molding step of molding the portion made cylindrical by the first molding step into a cylindrical shape having a reduced diameter using an outer roller;
A method for forming an elliptical cylindrical body characterized by comprising: In the molding method of the elliptical cylinder according to claim 1,
The molding in the second molding step is performed with a time slightly delayed from the molding in the first molding step. In the method of forming an elliptical cylinder, a part of the elliptical cylinder is formed into a cylindrical shape by spinning,
A first molding step of molding a part of the elliptic cylinder into a cylindrical shape using an inner roller and an outer roller at the same time;
A second molding step of molding the portion made cylindrical by the first molding step into a cylindrical shape having a reduced diameter using the outer roller;
A method for forming an elliptical cylindrical body characterized by comprising: In the molding method of the elliptical cylinder according to claim 3,
In the first forming step, the inner roller and the outer roller are moved in the extending direction of the central axis of the elliptical cylindrical body to form the short diameter portion of the elliptical cylindrical body and a portion near this. A method for forming an elliptical cylindrical body. In the shaping | molding method of the elliptical cylinder of any one of Claims 1-4,
The outer roller is provided in the same facility as the inner roller, and the first molding step and the second molding step perform the molding in the same facility. Molding method. In the molding method of the elliptical cylinder according to any one of claims 1 to 5,
The method for forming an elliptical cylindrical body, wherein the inner roller is longer than the outer roller. In the shaping | molding method of the elliptical cylinder of any one of Claims 1-6,
A method for forming an elliptical cylindrical body, wherein a processing region of the outer roller used in the second forming step is longer than a processing region of the inner roller used in the first forming step. . In an elliptical cylinder molding device that molds a part of an elliptical cylinder into a cylindrical shape by spinning,
An inner roller located inside the elliptical cylinder and forming a part of the elliptical cylinder into a cylindrical shape;
An outer roller which is located outside the elliptical cylindrical body and is formed into a cylindrical shape with a reduced diameter at a portion made cylindrical by the inner roller;
An apparatus for forming an elliptical cylindrical body characterized by comprising: In the apparatus for forming an elliptical cylinder according to claim 8,
An apparatus for forming an elliptical cylindrical body, characterized in that the molding by the outer roller is performed with a time slightly delayed from the molding by the inner roller. In an elliptical cylinder molding device that molds a part of an elliptical cylinder into a cylindrical shape by spinning,
An inner roller located inside the elliptical cylinder and forming a part of the elliptical cylinder into a cylindrical shape;
An outer roller located outside the elliptical cylinder and forming a part of the elliptical cylinder into a cylindrical shape;
A cylinder in which a part of the elliptical cylindrical body is formed into a cylindrical shape using the inner roller and the outer roller at the same time, and then the cylindrical portion is reduced in diameter using the outer roller. An apparatus for forming an elliptical cylindrical body, characterized in that the apparatus is formed into a shape. The apparatus for forming an elliptical cylinder according to claim 10,
The inner roller and the outer roller are moved in the extending direction of the central axis of the elliptical cylindrical body, and the short diameter portion of the elliptical cylindrical body and a portion near this are formed into a cylindrical shape. An apparatus for forming an elliptical cylindrical body. The apparatus for forming an elliptical cylinder according to any one of claims 8 to 11,
An apparatus for forming an elliptical cylindrical body, wherein the inner roller is longer than the outer roller. In the shaping apparatus of the elliptical cylinder according to any one of claims 8 to 12,
An apparatus for forming an elliptical cylindrical body, wherein a processing region of the outer roller is longer than a processing region of the inner roller.

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