JP2001030018A - Manufacture of bottomed cylindrical body by spinning, and its device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To machine a desired bottomed cylindrical body by smoothly and appropriately implementing the draw-spinning and the iron-spinning on a plate stock with a simple constitution. SOLUTION: A work 4 of a plate stock is held in a non-rotational manner by a bottom part of a core 3 formed in the shape as the contour of a bottomed cylindrical body targeted to be machined, and a holding bar 41 concentrically opposite to the core. The work of the plate stock is pressed and deformed to implement the draw-spinning and the iron-spinning to form the bottomed cylindrical body so that an inner surface is matched with the contour shape of the core while a plurality of rollers 28 to be revolved at equal intervals around the core and the holding bar on the circumferential locus of the same diameter are moved in the axial direction of the core and the holding bar and the revolving locus diameter of the rollers is simultaneously changed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for manufacturing a bottomed cylindrical body by spinning, and more particularly, to drawing spinning and ironing spinning of a metal plate-like material to form a bottomed cylindrical body. The present invention relates to a method and an apparatus for manufacturing a bottomed cylindrical body to be formed.

[0002]

2. Description of the Related Art Conventionally, spinning has been used for manufacturing various rotationally symmetric parts. This is a method of forming by pressing a roller tool by rotating a plate material or the like. For example, a book "Rotation Working-Rolling and Spinning-" (Plastic Working Technology Series 11, Japan Society for Plastic Working, biased, December 20, 1990, first edition) 1st print, published by Corona Co., Ltd.), pp. 143 to 199. The book includes drawing spinning, in which the blanks are pressed against the mandrel, and pressing the rollers against the blank while rotating them to form the drawing, ironing spinning, which does not change the outer diameter but reduces the wall thickness, and cylindrical. Three methods of spinning and ironing the walls of a slab blank are disclosed. Furthermore, there is an example in which a reverse cone on the right side is formed by drawing spinning at the beginning of processing, and a cone on the left side is formed by ironing spinning from the middle to process a megaphone-like lamp shade (page 145 of the same book). .

[0003] As an example of a method of forming a bottomed cylinder from a plate material described as the most difficult processing in the above book, Japanese Patent No. 2673810 discloses a mandrel attached to a rotating spindle and a mandrel attached to the mandrel. A drawing method using a spinning machine using a drawing roller that draws a workpiece along the line is disclosed. Japanese Patent Application Laid-Open No. 9-239472 discloses that a hollow cylindrical material is
A method of drawing a bellows tube material in which a central cylindrical portion is rolled into a bellows forming portion having a predetermined thickness and a predetermined length by spatula drawing (rather, equivalent to ironing spinning) is disclosed. In particular, Japanese Patent Publication No. 3-1089 discloses that a material plate is press-formed to form a container body having a bottom and a tube portion, and the tube portion is spin-formed (equivalent to ironing spinning) to form a long tube portion. A method of making a jug is disclosed.

Further, Japanese Patent Application Laid-Open No. 10-296365 discloses a drum forming method in which both the drawing spinning and the ironing spinning are combined. The publication aims to provide a method of forming an integral drum by short-time molding while preventing the inclination of the teeth and preventing the axial center misalignment between the internal teeth and the external teeth. The internal teeth of the first drum portion are formed by cold plastic deformation by flow forming while the boss portion of the circular plate material is pinched and fixed while the axes of the shafts are aligned, and the second tooth is formed by cold plastic deformation by rolling. A one-clamp processing method for forming external teeth on the outer surface of a two-drum portion has been proposed.

[0005]

As a method of producing a bottomed cylinder by performing spinning on a metal plate-like material, a conventional drawing spinning process involves a method in which a plate-like material and a mandrel (core metal) are used together with a shaft center. A single roller that rotates around the axis of the mandrel and rotates around the axis of the mandrel is driven in the axial direction and radial direction of the mandrel to process the plate-shaped material. Because the material plastically flows backward (rearward after rotation), and the entire material to be processed is also pressed to the opposite side, the pressing force of the roller is not effectively converted to plastic flow, ensuring a predetermined outer shape and thickness. And it is difficult to maintain the shape accuracy.

On the other hand, it is efficient to continuously perform from the drawing spinning process to the side wall spinning process on the plate-like material by one machine, and it has been desired to realize this. In particular, it is effective for manufacturing an article having a shape as described in JP-B-3-1089. In order to solve the above-mentioned problem and respond to the demand for continuous processing, it is only necessary to arrange a plurality of rollers so as to always face each other around the axis of the material, so that a plurality of pressing forces are always applied in the axial direction. Is done. In addition, in order to respond to the demand of realizing with one machine, it is only necessary to incorporate the equipment for drawing spinning and the equipment for ironing spinning into one machine, but it is desirable to simply incorporate both facilities. The effect of is not obtained.

In the above-mentioned Japanese Patent Application Laid-Open No. Hei 10-296365, a configuration is adopted in which a shaft is sandwiched between two rollers and pressed from both sides (using the lever ratio of a roller arm). Is formed in an arc with the fulcrum at the end of the arm as the center, so that it is not possible to perform the processing while always maintaining the state in which the two rollers face each other across the axis of the material. In other words, it still cannot meet the above demand. In addition, although two sets of rollers, ie, a drawing roller and an ironing roller, are used, the rollers of each set are always moved radially (pressing operation) and axially relative to each other around the material. Is structurally impossible. In order to do this, a device for controlling each of the plurality of rollers so as to be able to move individually along a radial trajectory is required, and a very complicated and large-sized device is inevitable.

Further, as a problem common to the drawing spinning apparatus and / or the ironing spinning apparatus having a structure (non-revolution type) in which the material side is rotated and the roller is not rotated around the material, the material to be processed is divided into two parts. It is necessary to not only rotate but also move in the axial direction while holding firmly from both sides with holding members (mandrel), and it is essential to ensure the rotational strength and rigidity of both holding members. In addition to the increase in weight and cost, it is inevitable that these control devices become complicated and large. Further, there is a problem that when the presser having a long overall length (and the material to be processed to be clamped) is rotated at a high speed, the material portion becomes a mass and vibrates, making it difficult to perform high-precision processing.

Therefore, the present invention provides a method of manufacturing a bottomed cylinder that can be smoothly and appropriately subjected to drawing spinning and ironing spinning with a simple configuration and processed into a desired bottomed cylinder. And an apparatus.

[0010]

In order to solve the above-mentioned problems, a method of manufacturing a bottomed cylindrical body according to the present invention has the same shape as the outer shape of a bottomed cylindrical body to be processed. The first method for holding the plate-shaped material in close contact with the bottom of the formed metal core so that it cannot rotate.
And moving a plurality of rollers revolving around the axis of the core metal along the same diameter circumferential locus in the axial direction of the core metal while changing the orbit of the orbit, thereby pressing and deforming the plate-shaped material. do it,
A second step of performing the drawing spinning process and the ironing spinning process to form the bottomed cylinder so that the inner surface matches the outer shape of the cored bar.

In the method of manufacturing a bottomed cylindrical body, the second step may be such that, after the plate-shaped material is pressed and deformed and conforms to the outer shape of the cored bar, The method may include a step of pressing the side wall portion of the bottomed cylindrical body in the axial direction of the core metal by the plurality of rollers, and rolling to a predetermined thickness and length.

Further, in the method of manufacturing a bottomed cylindrical body,
As described in claim 3, the outer peripheral surface of the cored bar is engraved in a desired surface shape, and the surface shape is transferred to the inner surface of the bottomed cylindrical body in the second step. You may comprise.

Alternatively, as a method of manufacturing a bottomed cylindrical body, as described in claim 4, the bottom of a cored bar formed in the same shape as the outer shape of the bottomed cylindrical body to be processed, and A first step of non-rotatably holding the plate-like material by a presser bar that is coaxially opposed, and three pieces that can revolve around the core metal and the presser bar at equal intervals along a circumferential locus of the same diameter. The roller is moved in the axial direction of the mandrel and the presser bar while simultaneously changing the orbit of the orbit, and the plate-shaped material is pressed and deformed to perform drawing spinning and ironing spinning. A second step of forming the bottomed cylinder so that the inner surface matches the outer shape.

On the other hand, according to a fifth aspect of the present invention, there is provided an apparatus for manufacturing a bottomed cylindrical body, comprising: a hollow main shaft; supporting means mounted on a tip end of the main shaft; A plurality of rollers provided so as to be able to revolve and be movable in the radial direction at equal intervals on a circumferential locus coaxial with the main shaft, and a presser which is supported in the main shaft so as to be able to advance and retreat independently of the main shaft so as not to rotate. A rod, a metal core formed in the same shape as the outer shape of the bottomed cylindrical body to be processed, and a core metal disposed so as to be coaxially opposed to the front surface of the holding rod and the support means, and the core metal and the holding rod. The support means is rotationally driven while at least one of the plate-shaped material and the support means is driven in the axial direction of the main shaft while the plate-shaped material is non-rotatably held therebetween. While changing the orbit of the plurality of rollers according to the drive at the same time, Relaxin gold and the plate-like material is moved in the axial direction of the presser bar by pressing deformation, those with ironing and a drive means for spinning with performing stop spinning.

Further, in the apparatus for manufacturing a bottomed cylindrical body,
7. The rotating device according to claim 6, wherein the main shaft is formed of a double pipe of an inner pipe and an outer pipe, and the driving means is configured to rotate the inner pipe and the outer pipe so that the rotation speeds thereof are different from each other. And a transmission control means for controlling the diameter of the orbit of the plurality of rollers according to a relative speed difference between the inner tube and the outer tube in a state where the plurality of rollers are rotated together with the main shaft. It is good to

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method and an apparatus for manufacturing a bottomed cylindrical body by spinning having the above structure will be described with reference to the drawings. FIG. 1 shows a spinning apparatus according to an embodiment of the present invention, in which the final product is axially symmetric,
It becomes a bottomed cylindrical body integrally having a wall portion perpendicular to the axis. For example, various products such as bottle-shaped containers, accumulators, pulleys or gears, various housings, wheels, thermos bottles, pots, fire extinguishers, and the like are available. In the present embodiment, the raw material (raw material before processing) is a metal plate-shaped material, but the type of the material does not matter.

As shown in FIG. 1, a pair of guide rails 5 are fixed on a base BS, and a casing 20 is movably arranged along the guide rails 5. This housing 20
A ball socket 7 is fixed to a lower portion of the base, and a screw shaft (ball screw) 8 screwed to the ball socket 7 is arranged on the base BS in parallel with the guide rail 5, and is rotatably supported by a servomotor 9. ing. Thus, the servo motor 9
The housing 20 is configured to move along the guide rail 5 when the screw shaft 8 is driven to rotate by the rotation.

The main shaft 2 is arranged in the housing 20 in parallel with the guide rail 5, and is rotatably supported via bearings 20a and 20b. The main shaft 2 of the present embodiment is formed as a double pipe by a cylindrical outer pipe 21 and an inner pipe 23, and is connected to a transmission mechanism 50 described later. Further, a pressing rod 41 is provided so as to penetrate the hollow portion of the inner tube 23, and is supported so as to be able to advance and retreat in the axial direction independently of the main shaft 2. That is, the presser bar 41 is floating supported by the inner tube 23 of the main shaft 2 via a bearing, and
It is configured to be able to move in the axial direction irrespective of the rotation and the axial movement. The base end of the holding rod 41 is supported by a cylinder 42 for driving forward and backward, and the cylinder 42 is
3 and supported by the base BS.

The outer tube 21 of the main shaft 2 is connected to a pulley 22b via a gear train 22a, and the pulley 22b is connected to a motor (not shown) of a rotary driving means via a belt (not shown). The outer tube 21 is driven to rotate by this motor or the like. A flange 24 is provided at the tip of the outer tube 21.
Is fixed, and when the outer tube 21 is driven to rotate, the flange 24 rotates about the axis of the main shaft 2. On the other hand, the inner pipe 2
3 is rotatably supported by the outer tube 21 and the flange 24. The support plate 2 is provided at the tip of the inner tube 23.
The support plate 25 is driven to rotate about the axis of the main shaft 2 together with the inner tube 23.

The support plate 25 is formed with three spiral guide grooves 25a as shown in FIG. 2, and each of these guide grooves 25a moves in the radial direction with the rotation of the support plate 25. Guide pins 26 are disposed. These guide pins 26 are respectively held by three support members 27, and a roller 28 is rotatably supported by each support member 27 as shown in FIG. Thus, the support means of the present invention is constituted by the support plate 25 and the support member 27, and the inner tube 23 is provided.
Is driven to rotate, the roller 28 rotates (revolves) about the axis of the main shaft 2, and the support member 27 is driven in the radial direction along the guide groove 25 a in accordance with the rotation of the support plate 25, The roller 28 is driven so as to approach and separate from the axis of the main shaft 2. That is, the operation of the roller 28 is performed during the rotation of the support plate 25, and the roller 28 changes its orbit diameter while revolving.

The speed change mechanism 50 to which the outer tube 21 and the inner tube 23 are connected constitutes a transmission control means of the present invention. In this embodiment, the transmission mechanism 50 uses a bending-meshing type driving device. A pair of outer rings 51 and 5 respectively engaged with the inner tube 23
2, a flexible gear wheel 53 meshed with the same number of tooth grooves formed on the inner surface thereof and having a tooth profile with a different number of teeth, and the gear wheel 53 is made rotatable. A wave forming wheel 54 is provided which is supported and arranged so as to mesh with two places opposed to the tooth spaces of the outer rings 51 and 52. The wave forming wheel 54 is driven to rotate by a drive reduction motor 55. The outer rings 51 and 52 are supported by supporting gears 56 and 57, respectively. A driving gear 58 meshing with the supporting gear 56 is attached to the outer tube 21 and a driven gear 5 meshing with the supporting gear 57.
9 is attached to the inner tube 23.

The above-mentioned flexible mesh drive is known as, for example, a harmonic drive (for example, Internet information http://www.hds.co.jp/hdss.ht).
m) Although a description of the operation principle is omitted, a differential mechanism is formed in which a relative speed difference is generated between the outer rings 51 and 52 in accordance with the rotational driving of the outer tube 21. Thus, when the outer tube 21 is driven to rotate, the support plate 25 is driven to rotate via the inner tube 23 by the differential between the outer rings 51 and 52, and each support member 27, and consequently each roller 28, is driven by the main shaft 2. It will move radially with respect to the axis.

Although a plurality of rollers 28 are provided to reduce intermittent impacts, it is ideal to arrange three rollers 28 at equal intervals as in this embodiment. Also,
The roller 28 may have any moving path as long as it can be displaced in the radial direction. Other means such as a planetary gear mechanism or the like may be used as the driving means of the roller 28 and the differential mechanism. The driving means such as the motors 9, 55 and the cylinder 42 are electrically connected to a controller (not shown), and a control signal is output from the controller to each driving means so that the driving means is numerically controlled. It is configured.

On the other hand, the clamping device 1 is mounted on the left base BS of FIG. 1 so as to face the pressing rod 41, the roller 28 and the like.
2 is fixed. The clamp device 12 includes a shaft portion 3a of the cored bar 3 formed in the same shape as the outer shape of the bottomed cylindrical body to be processed.
Is firmly held so as not to rotate and move. The central axis of the core bar 3 is fixed so as to be located on the central axis of the presser bar 41, and the workpiece 4 made of a plate-shaped material is disposed between the tip of the presser bar 41 and the core bar 3. Therefore, the central axes of the main shaft 2 and the presser bar 41 are the same, and the main shaft 2 and the core bar 3 are arranged so that the central axes thereof coincide with each other. The workpiece 4 is held so that its center is located at the axis of the presser bar 41 (the axis of the main shaft 2).

Although the structure of the clamp device 12 is not shown, the clamp device 12 is configured so as to detachably hold the core bar 3 so that the core bar 3 can be easily replaced (changed). Furthermore, if the position of the workpiece 4 can be adjusted in the axial direction with respect to the cored bar 3, the workpiece 4 can be appropriately and easily positioned in the axial direction. Alternatively, the housing 20 is connected to the base BS.
And the clamp device 12 may be movably supported.

The workpiece 4 is processed by the spinning apparatus.
An example in which the drawing spinning process and the ironing spinning process are performed will be described with reference to FIGS.
In FIG. 1, first, the center of the workpiece 4 made of a plate-shaped material as an original material is arranged so as to coincide with the center of the bottom surface (the surface on the right side in FIG. 1) of the cored bar 3. The cylinder 42 is driven in contact with the gold 3. As a result, the presser bar 41 moves forward (moves to the left in FIG. 1), and the workpiece 4 is sandwiched between the cored bar 3 and the tip of the presser bar 41, and cannot be rotated as shown in FIG. Held in a state, the first
Is completed. Since the presser bar 41 is floatingly supported on the main shaft 2 as described above, it is possible to maintain the state in which the workpiece 4 is held irrespective of the rotation and axial movement of the main shaft 2.

Next, the housing 20 is driven forward along the guide rail 5 (moves to the left in FIG. 1), and each roller 28 is moved by the peripheral edge of the bottom surface of the metal core 3 as shown in FIG. Is brought into contact with. From this state, the main shaft 2 moves from its axis (=
Each roller 28 is rotated around the axis of the main shaft 2, and the support plate 25 is driven to rotate via a speed change mechanism 50, and each roller 28 is rotated around the axis of the main shaft 2. It moves in the direction of the axis 2 (= the axis of the core 3). at the same time,
Each roller 28 is driven forward along the guide rail 5 (moves to the left in FIG. 1). With the rotation drive and the forward drive, each roller 28 rotates itself (that is, self-rotates) while being pressed against the surface of the workpiece 4 and the main shaft 2.
While rotating (ie, revolving) about the axis of the metal shaft 3, it is driven in a radial direction in a direction away from the axis of the cored bar 3 (a direction in which the diameter of the orbit of the orbit increases), and as shown in FIG. Done.

By the drawing spinning process, portions of the workpiece 4 other than the surface in close contact with the bottom surface of the cored bar 3 are deformed by the rollers 28, and finally the inner surface of the workpiece 4 as shown in FIG. Adhere to the outer peripheral surface of the cored bar 3. At this time, it is desirable to control the roller 28 so as to always contact the workpiece 4. The workpiece 4 may be gradually deformed by repeatedly moving the roller 28 forward or backward (moving in the left-right direction in FIG. 1) while increasing or decreasing the diameter of the orbit of the roller 28. In this manner, the plate-shaped workpiece 4 is deformed to have substantially the same shape as the outer shape of the cored bar 3 and is formed into a bottomed cylindrical body.

Further, as shown in FIG. 3, the roller 28 is pressed and driven in the axial direction so that the roller 28 always comes into contact with the workpiece 4 formed in the bottomed cylindrical body as described above. At the same time, it is driven forward (moved to the left in FIG. 1). With the pressing and the forward drive, the workpiece 4 is reduced in the thickness of the side wall portion and is extended in the axial direction, so that the rolling process is performed. That is, ironing spinning is performed.
At this time, the roller 28
Due to the orbital motion and the axial movement of the material, the material plastically flows spirally.

In the present embodiment, three rollers 28
Is a revolving orbit diameter set to a value slightly smaller than the outer diameter of the workpiece 4, and rotates in a state of contacting the outer peripheral surface of the workpiece 4, and at the same time, in the front-to-back direction with respect to the paper surface of FIG. (Left / right direction). When the roller 28 reaches the opening end of the workpiece 4, the roller 28 is driven in a direction away from the axis of the metal core 3 (the diameter of the orbit of the orbit is enlarged), and the roller 28 starts to be separated from the workpiece 4 (the processing start position). (The bottom side of the object 4). The above process is one ironing spinning process. And 2
In the second ironing spinning, the same operation is performed with the orbit of the orbit smaller than that of the first ironing. When the ironing spinning process is performed n times in this manner, the workpiece 4 is formed into a bottomed cylindrical body having a predetermined thickness and length, and the second step according to the present invention is completed.

As described above, according to the present embodiment, the pressing force is constantly applied in the axial direction by the plurality of rollers 28 revolving at equal intervals on a circumferential locus having the same diameter. 4 is subjected to drawing spinning and ironing spinning while making uniform and smooth plastic flow in the circumferential direction. Further, since the pressing force is balanced about the axis of the core 3 (and the workpiece 4) (around the axis), the workpiece 4 may be inclined to one side or may be separated from the core 3. Thus, the pressing force of the roller 28 can be efficiently converted to plastic flow without waste.

Further, the metal core 3, the workpiece 4 and the presser bar 41 are provided.
Since neither of them rotates, it is possible to easily configure a structure that strongly presses the workpiece 4, and it is possible to avoid problems such as blurring of the workpiece 4 due to rotation. Of course, these members have been reduced in strength and weight due to lower rigidity,
Cost reduction is also possible, and as a result, the structure of the entire device can be simplified. Further, in the mass production process, the workpiece 4 can be easily replaced without stopping the rotation of the roller 28, so that the tact time can be reduced and the energy efficiency is improved.

In the above-described apparatus, a plurality of rollers 28 are mounted on one rigid support plate 27 at equal circumferential intervals,
Since these rotate together with the support plate 27, each roller 28
Since the reaction force received from the workpiece 4 uniquely acts as the pressing force of the other roller 28, the pressing force can be more efficiently converted into plastic flow. Since efficient plastic flow is possible in this way, regardless of which of the drawing spinning processing and the ironing spinning processing requires a large processing force, one type can be used without requiring a special large roller as in the past. Roller 3 for normal spinning
This can be dealt with individually, and the size and weight can be reduced.

FIGS. 6 and 7 show another embodiment in which a so-called internal tooth pulley is manufactured as a final product from a plate-like material. In this embodiment, a plurality of ridges 3b are formed on the outer peripheral surface of the metal core 3 in parallel with its axis, and the metal core 3 is formed in a gear shape. A hole 4a is formed at the center of the plate-shaped material that is the raw material of the workpiece 4. By subjecting the workpiece 4 to drawing spinning and ironing spinning in the same manner as described above, the workpiece 4 is formed into a bottomed cylindrical body having a hole (4a) on the bottom surface. . Further, the gear shape formed by the ridges 3b formed on the outer peripheral surface of the cored bar 3 is transferred and engraved on the inner surface of the workpiece 4 by the material flow at the time of ironing and spinning, and as shown in FIG. Internal pulley P having
L is formed.

The outer peripheral surface of the metal core 3 can be engraved in a desired surface shape. Therefore, what can be transferred and formed on the inner surface of the bottomed cylindrical workpiece 4 is not limited to the internal teeth, but may be a plurality of fins 4f extending in the longitudinal direction as shown in FIG. It can also be a ridge (not shown) and can have any shape and arrangement. The plurality of fins 4f shown in FIG. 8 are formed to prevent the rotation of the tube TB, and conventionally, broaching has been generally used.
This processing requires a cutting tool and is a separate step, so that additional cost and time were required for fin formation. On the other hand, according to the present embodiment, the fins 4f are formed at the same time as the spinning, so that the process can be shortened and the cost can be reduced.

As an extension of a series of processing steps, the opening of the workpiece 4 formed into the bottomed cylindrical shape as described above can be necked. That is, as shown in FIG. 9, instead of the cored bar 3, by attaching a chuck device 13 for gripping the workpiece 4 formed in the shape of a bottomed cylinder, the above-described drawing spinning and ironing are performed. A necking with a small diameter can be formed in the opening 4c of the workpiece 4 by performing a necking process by spinning subsequent to the spinning process.

Although not shown, the chuck device 13 in this case is configured so that the workpiece 4 can be held by, for example, a pair of chucks that can move radially toward the axis of the workpiece 4. You. The exchange (step change) between the core metal 3 and the chuck device with respect to the clamp device 12 can be performed manually, but may be configured to be automatically performed by a robot (not shown). Further, for example, JP-A-11-147138 and JP-A-11-151
As described in Japanese Patent Publication No. 535, eccentric spinning or bending spinning may be performed to form an eccentric neck or a curved neck.

As described above, not only the drawing spinning process and the ironing spinning process on the workpiece 4 can be performed continuously in one process, but also the chuck device 13 can be used.
Is prepared and can be exchanged for the cored bar 3, necking can be performed continuously, and the processing time can be further reduced.

[0039]

Since the present invention is configured as described above, the following effects can be obtained. That is, claims 1, 2, 4
According to the method and the apparatus for manufacturing a bottomed cylindrical body by spinning according to claims 5 and 6, the plurality of rollers revolving at equal intervals on a circumferential locus having the same diameter in the axial direction of the workpiece. Since the pressing force is constantly applied to the workpiece, the workpiece is subjected to spinning and ironing spinning while performing uniform and smooth plastic flow in the circumferential direction, and is quickly and easily formed into a desired shape with high precision. can do. Further, since the workpiece can be easily replaced without stopping the rotation of the roller, the processing time can be reduced and the energy efficiency can be improved.

Furthermore, according to the third aspect of the present invention, the surface shape of the metal core is transferred onto the inner surface of the bottomed cylinder at the same time as the spinning process, so that the steps can be shortened and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a front view showing a state in which a part of a spinning apparatus according to an embodiment of the present invention is partially broken.

FIG. 2 is a front view of a support member of the spinning apparatus according to one embodiment of the present invention, and is a cross-sectional view taken along line AA of FIG.

FIG. 3 is a partial cross-sectional view showing a state of ironing and spinning processing in one embodiment of the present invention.

FIG. 4 is a cross-sectional view showing a draw spinning process in one embodiment of the present invention.

FIG. 5 is a cross-sectional view showing a draw spinning state in one embodiment of the present invention.

FIG. 6 is a front view showing an example of a core in another embodiment of the present invention.

FIG. 7 is a perspective view showing a processed internal pulley according to another embodiment of the present invention.

FIG. 8 is a side view showing a tube after processing in another embodiment of the present invention.

FIG. 9 is a front view showing a partially broken state of a spinning device according to still another embodiment of the present invention.

[Explanation of symbols]

2 main shaft, 3 cored bar, 4 plate material, 12 clamping device, 21 outer tube, 23 inner tube, 25 support plate,
25a guide groove, 27 support member, 28 roller,
41 presser bar, 50 speed change mechanism

Claims (6)

[Claims] 1. A first step of holding a plate-shaped material in close contact with a bottom of a metal core formed in the same shape as the outer shape of a bottomed cylindrical body as a processing target in a non-rotatable manner. A plurality of rollers revolving around the same diameter circumferential locus are moved in the axial direction of the core metal while changing the orbit of the revolving orbit, and the plate-shaped material is pressed and deformed to perform drawing spinning and ironing spinning. And forming a bottomed cylinder so that the inner surface matches the outer shape of the cored bar. 2. The method according to claim 2, wherein, after the plate-shaped material is pressed and deformed to conform to the outer shape of the metal core, the side wall of the bottomed cylindrical body is formed by the plurality of rollers on the metal core. 2. The method for producing a bottomed cylindrical body according to claim 1, further comprising the step of: pressing in a direction of an axis and rolling to a predetermined thickness and length. 3. The method according to claim 2, wherein the outer peripheral surface of the cored bar is engraved in a desired surface shape, and the surface shape is transferred to the inner surface of the bottomed cylinder during the second step. Item 3. The method for producing a bottomed cylindrical body according to Item 2. 4. The plate-shaped material is non-rotatably held by a bottom portion of a metal core having the same shape as the outer shape of the bottomed cylindrical body to be processed and a pressing rod coaxially opposed to the metal core. First
And three rollers capable of revolving around the mandrel and the presser bar at equal intervals around the same diameter circumferential locus while simultaneously changing the revolving orbit diameter in the axial direction of the mandrel and the presser bar. And pressing and deforming the plate-shaped material to perform drawing spinning and ironing spinning, thereby forming the bottomed cylinder so that the inner surface matches the outer shape of the cored bar. A method for producing a bottomed cylindrical body by spinning. 5. A hollow main shaft, supporting means mounted on the tip of the main shaft, and revolvable and radially movable on a front surface of the supporting means at equal intervals on a circumferential locus coaxial with the main shaft. A plurality of rollers provided in the main shaft, a presser bar which is capable of moving back and forth independently of the main shaft so as to be non-rotatably supported, and formed in the same shape as the outer shape of the bottomed cylindrical body to be processed, and Rotating the support means in a state in which the plate-shaped material is non-rotatably clamped between the core metal and the presser bar, the core being disposed coaxially with the rod and the front surface of the support means; While driving, at least one of the plate-shaped material and the support means is driven in the axial direction of the main shaft, and the plurality of rollers are rotated in accordance with the rotation of the support means while simultaneously changing the orbit of the orbit. And the plate material is pressed and deformed by moving in the axial direction of the presser bar. And a drive means for performing drawing spinning and also performing ironing spinning. An apparatus for manufacturing a bottomed cylindrical body by spinning. 6. The main shaft comprises a double pipe of an inner pipe and an outer pipe, and a rotation driving means for driving the inner pipe and the outer pipe to rotate so that the rotation speeds thereof are different from each other; Transmission control means for controlling the diameter of the orbit of the plurality of rollers according to a relative speed difference between the inner tube and the outer tube in a state where the plurality of rollers are rotated together with the main shaft. An apparatus for manufacturing a bottomed cylinder by spinning according to claim 5.