JP2000140988A - Method and device for production of cylindrical body and ring gear integrated drive plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a forming method and a device of a cylindrical body capable of thickening a work having a cylindrical part without causing buckling and to provide a ring gear integrated drive plate produced thereby. SOLUTION: A work having a cylindrical part is vertically arranged between an upper base 1 and a lower base 10 of a press device, a transfer die 17 is arranged outside the work 11 and a liquid (shown by dotted portion) is filled in the inside, at this state, by approaching the upper base 1 and the lower base 10, the work 11 is vertically pressed while thickening, the liquid is compressed/pressurized, the work 11 is pushed to the transfer die 17.

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 molding a cylindrical body for increasing the thickness of the cylindrical body and for molding the inner or outer surface into a predetermined shape such as a tooth profile, and to manufacture the same. To a ring gear integrated drive plate.

[0002]

2. Description of the Related Art As shown in FIG. 18 (a), a product a having a cylindrical shape (or a cup-shaped body with a bottom) formed on the outer surface (or inner surface) thereof, such as a camshaft pulley of an engine. Has conventionally been manufactured by sintering or the like, but in recent years, in order to reduce the manufacturing cost, an attempt has been made to form the product a from a sheet into a sheet metal by pressing. Specifically, first, a material plate is pressed to form a cup-shaped preform product (work), and the work is further pressed in the axial direction to form the toothed product a.

[0003]

However, in this case, since the work is pressed in the axial direction, a radial pressing force cannot be obtained, and the shape of the tooth portion b cannot be accurately formed. When the end c of the work is pressed to increase the accuracy of the shape of the tooth b, the work buckles as shown in FIG. Therefore, the conventional sheet metal toothed product a has a certain limit in the shape accuracy of the tooth portion b and cannot be used as a product requiring high accuracy.

In the conventional press working, the toothed product a is formed simply by bending and elongating a material plate or a work. Therefore, the thickness of the tooth portion b of the product a is made larger than the thickness of the material plate. Difficult to make thick. Therefore, the strength and rigidity of the essential tooth portion b must be reduced.

SUMMARY OF THE INVENTION An object of the present invention, which has been made in consideration of the above circumstances, is to increase the thickness of a work having a cylindrical portion without buckling and to form a tooth profile on one of the inner and outer surfaces. It is an object of the present invention to provide a method and an apparatus for forming a cylindrical body which can be accurately formed into a predetermined shape such as the above, and a ring gear-integrated drive plate manufactured thereby.

[0006]

According to a first aspect of the present invention, there is provided a method for forming a cylindrical body, comprising vertically disposing a work having a cylindrical portion between an upper base and a lower base of a press device. Then, the transfer die is arranged outside the work and the inside is filled with the liquid, and in this state, the upper table and the lower table are brought close to each other, whereby the work is pressed in the vertical direction and the liquid is increased while increasing the wall thickness. The work is compressed and pressed to press the work against the outer transfer die.

A workpiece having a cylindrical portion tends to buckle due to its vertical pressing, but is pressed against the outer transfer die by a liquid which is filled inside and is simultaneously compressed and pressurized. The thickness (teeth shape, etc.) of the transfer mold is accurately transferred to the outer surface while increasing the wall thickness without bending. In addition, since the pressing of the work and the compression of the liquid are simultaneously performed by the usual press device, no special equipment is required.

According to a second aspect of the present invention, there is provided a method for forming a cylindrical body, wherein a work having a cylindrical portion is vertically arranged between an upper base and a lower base of a press device, and a transfer die is arranged inside the work. The upper and lower bases are brought close to each other in such a way that the liquid is compressably interposed on the outside by the upper and lower bases.In this state, the work is pressed in the vertical direction and the liquid is compressed and pressurized while increasing the wall thickness. Of the transfer mold.

In this case as well, the work having the cylindrical portion tends to buckle due to its vertical pressing, but is pressed against the inner transfer die by the liquid which is interposed on the outside and is compressed and pressed simultaneously with the pressing. The thickness (teeth shape, etc.) of the transfer mold is accurately transferred to the inner surface without buckling. In addition, since the pressing of the work and the compression of the liquid are simultaneously performed by the usual press device, no special equipment is required.

Further, the transfer die may be moved in the vertical direction integrally with the work in accordance with the vertical pressing of the work. This reduces the friction between the work and the transfer mold, so that the surface of the product is clean and the pressing force (pressing force) of the pressing device can be reduced.

According to a third aspect of the present invention, there is provided an apparatus for forming a cylindrical body, comprising: a mounting table for vertically mounting a work having a cylindrical portion; a transfer mold disposed outside the work; It is provided with a filling means for filling the liquid, and an axial force punch for compressing the liquid while pressing the end face of the work vertically. This “cylindrical body forming apparatus” is used for performing the “cylindrical body forming method” according to the first aspect of the invention.

According to a fourth aspect of the present invention, there is provided an apparatus for forming a cylindrical body, comprising: a mounting table for vertically mounting a work having a cylindrical portion; a transfer mold disposed inside the work; A compression chamber that is partitioned and accommodates the liquid in a compressible manner, a filling unit that fills the compression chamber with the liquid, and an axial force punch that compresses the liquid in the compression chamber while vertically pressing the end face of the work. It is configured. This “cylindrical body forming device”
Is used for carrying out the “method of forming a tubular body” according to the second invention.

Further, the transfer die may move in a vertical direction integrally with the work in accordance with the vertical pressing of the work by the axial force punch.

In a ring gear integrated drive plate according to a fifth aspect of the present invention, a work having a cylindrical portion is vertically arranged between an upper base and a lower base of a press device, and a gear-shaped transfer die is arranged outside the work. At the same time, the inside is filled with liquid, and in this state, the upper table and the lower table are brought close to each other, so that the work is pressed in the vertical direction and the liquid is compressed and pressed while increasing the wall thickness, and the work is transferred to the outer transfer mold. It is formed by pressing.

[0015]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIGS. 1 (a) and 1 (b), an axial force punch 2 is mounted on a lower surface of an upper base 1 of a press device. The axial force punch 2 includes a punch body 3 formed in a cylindrical shape.
And a concave portion 4 formed in a circular hole on the lower surface of the punch body 3. A column-shaped holder 5 is slidably fitted in the recess 4 in a vertical direction. The concave portion 4 and the holder 5 are not limited to the circular cross section as described above, but may have a square cross section.

The holder 5 has a holder main body 6 formed in a columnar shape and a flange portion 7 integrally formed at the lower end thereof.
And An annular sealing member 8 for sealing between the holder 4 and the recess 4 is provided on the side surface of the holder body 6. A spring 9 is provided between the upper surface of the holder 5 and the ceiling surface of the recess 4. The spring 9 is made of a rubber elastic body, a coil spring, or the like.

On the other hand, on the upper surface of the lower base 10 of the press device,
A mounting table 12 for vertically mounting the cup-shaped work 11 in a state of being opened upward is attached. Mounting table 1
Numeral 2 is composed of a cylindrical base that matches the diameter of the finished product 13 shown in FIGS. 2 (b) and 3 (b), and has on its side a tooth profile 14 which meshes with a transfer type tooth profile to be described later.

As shown in FIGS. 2 (a) and 3 (a), the work 11 is formed integrally with a cylindrical portion 15 having a rough tooth profile and one end of the cylindrical portion 15 is covered. The bottom plate 16 is formed by forming a material plate into a cup shape by ordinary press working. Such a work 11
As shown in FIG. 1 (a), the
Is held by

As shown in FIG. 1A, a cylindrical transfer die 17 is arranged outside the work 11. The transfer die 17 has a tooth profile 18 to be transferred to the work 11 on its inner peripheral surface, and is supported by a cushion pin 19 so as to be able to move up and down. As a result, the transfer mold 17
The tooth profile 18 on the inner peripheral surface meshes with the tooth profile 14 on the side surface of the mounting table 12 like a spline, and is pushed up and down by the axial force punch 2.

A plurality of cushion pins 19 are arranged at predetermined intervals in the circumferential direction of the transfer die 17, and each of the cushion pins 19 is attached to the lower base 10 by a spring or the like so as to be freely retractable. That is, as shown in FIG. 1A, the cushion pin 19 which is normally in a protruding state, when the axial force punch 2 pushes the transfer mold 17 downward when the upper table 1 is brought close to the lower table 10,
Along with that, as shown in FIG.
The work 11 can be compressed.

The work 11 is shown in FIG. 1 (a) in a state where the upper table 1 is moved upward to be separated from the lower table 10, and the axial force punch 2 and the holder 5 are separated from the transfer die 17 and the mounting table 12. The mounting table 1 accommodated in the transfer die 17
2 is placed. Thereafter, the upper base 1 is lowered, the work 11 is pressed by the holder 5, and the lower surface of the axial force punch 2 is brought into contact with the end surface 20 of the work 11 and the upper surface of the transfer die 17. As a result, the ring-shaped compression chamber 2 is formed by the inside of the work 11, the lower surface of the axial force punch 2, and the side surface of the holder 5.
1 is defined.

The compression chamber 21 is filled by a filling means 22 with a liquid such as oil or water (hereinafter indicated by dots).
The filling means 22 includes an oil passage 23 formed in the axial force punch 2, a check valve 24 connected to the oil passage 23,
It comprises an oil pump 25 connected to the check valve 24 and an oil tank (not shown) connected to the oil pump 25. The oil passage 23 has one end open to the compression chamber 21 and the other end connected to the check valve 24.

Also, instead of providing the filling means 22,
Liquid tank filled with liquid such as water or oil (not shown)
Is placed on the lower base 10 so that the transfer die 17 and the mounting base 12 are immersed below the liquid surface. When the work 11 is set on the mounting base 5, the liquid automatically flows into the inside of the work 11. It may be configured to be full. In this case, the configuration becomes simple and the cost is reduced. When the work 11 is filled with the liquid in this manner, the axial force punch 2 is lowered to cover the opening 6 of the preform product 4, and the compression chamber 21 is filled with the liquid (oil or the like) at a pressing force of zero. You.

When oil is filled in the compression chamber 21 by the filling means 22 or the liquid tank, the upper base 1 is lowered. Then, the end face 20 of the work 11 on the mounting table 12 is pressed by the axial force punch 2 and the oil in the compression chamber 21 is compressed and pressurized. At this time, the oil in the compression chamber 21 tends to leak from between the end face 20 of the work 11 and the lower surface of the axial force punch 2, but the end face 2 of the work 11
Since 0 is pressed by the lower surface of the axial force punch 2 to be crushed and sealed, there is no actual leakage.

Further, the oil in the compression chamber 21 that leaks between the side surface of the holder 5 and the recess 4 of the axial force punch 2 is sealed by the annular seal member 8. It should be noted that if the lowering speed of the upper base 1 (press speed of the press device) is increased to about the level of a normal mechanical press and the tolerance between the side surface of the holder 5 and the recess 4 of the axial force punch 2 is reduced, the sealing member 8 is eliminated. No leakage occurs.

Here, the holder 5 has a function of holding the work 11 between the mounting table 12 and the urging force of the spring 9 by being pressed downward by applying oil pressure to the flange portion 7 thereof. Demonstrate. Further, the holder 5 reduces the pressure receiving area of the oil with respect to the axial force punch 2 so that the pressing force of the upper base 1 (the pressing force of the pressing device).
It also has the function of reducing

That is, it is possible to compress and press the oil even if the holder 5 is eliminated and the lower surface of the axial force punch 2 is made flat and the inside of the cup-shaped work 11 is filled with oil. Since the liquid surface area of the oil filled in the cup-shaped work 11 becomes the oil receiving pressure area of the axial force punch 2, a large pressing force that can oppose the pressure receiving area is required. On the other hand, in this embodiment, since the ring-shaped oil liquid surface area (cross-sectional area of the compression chamber 21) between the holder 5 and the work 11 is the oil receiving pressure area, the pressing force is reduced by the integral of the cross-section of the holder 5. it can.

As described above, the oil in the compression chamber 21 which is compressed and pressurized by a relatively small press force without leaking is maintained at a predetermined pressure by the relief means 26. The relief means 26 includes an oil passage 27 formed in the axial force punch 2 and a relief valve 28 connected to the oil passage 27. The relief valve 28 can change the relief pressure. The oil relieved from the relief valve 28 is returned to an oil tank (not shown) connected to the oil pump 25.

According to the above configuration, FIG.
When the upper table 1 of the press apparatus is brought closer to the lower table 10 during (b), the work 11 having the cylindrical portion 15 tends to buckle due to the vertical pressing by the axial force punch 2 as shown in FIG. However, the oil filled in the inner compression chamber 21 is pressed against the outer transfer die 17 by the oil which is compressed and pressurized at the same time as the pressing, so that the thickness of the transfer die 17 is increased without buckling and the transfer die 17 is formed on the outer surface. Is accurately transferred.

That is, the axial force punch 2 not only presses the end face 20 of the work 11 in the axial direction, but also reduces the volume of the compression chamber 21 at the time of the press to compress and pressurize the oil, thereby converting the work 11 into oil. A pressing force is applied to the transfer mold 17 located radially outward. At this time, the oil becomes a radial liquid punch. Further, the radial pressing force of the work 11 against the transfer mold 17 is adjusted by changing the relief pressure of the relief valve 26.

As a result, the work 11 shown in FIGS. 2 (a) and 3 (a) is formed without buckling into the sheet metal toothed product 13 shown in FIGS. 2 (b) and 3 (b). This product 13 can be used for parts requiring high precision because the shape of the teeth 29 is strongly pressed against the transfer mold 17 by the oil, and the thickness of the teeth 29 is reduced by the axial force. Since the wall thickness is increased by the punch 2 without buckling compared to the original material plate pressure, it can be used for parts requiring strength. For example, it can be used for a camshaft pulley, a crank pulley, and the like.

In this embodiment, as shown in FIGS. 1A and 1B, when the axial force punch 2 compresses the work 11 in the vertical direction, the transfer die 17 is integrated with the work 11 by the cushion pin 19. Since it moves vertically downward, the friction between the work 11 to be compressed and the transfer mold 17 is reduced. Therefore, the surface of the side surface of the product 13 after pressing becomes clean, and the pressing force (pressing force) of the pressing device can be reduced by an amount corresponding to the reduced frictional resistance.

In this embodiment, as shown in FIGS. 1 (a) and 1 (b), an axial force punch 2, a holder 5, and a transfer die 17 are provided between an upper base 1 and a lower base 10 of a normal press. By pressing the upper table 1 and the lower table 10 in a state where the compression chamber 21 inside is filled with oil, the pressing of the work 11 by the axial force punch 2 in the axial direction is performed. And the press of the work 11 in the radial direction by the oil compressed and pressurized are performed at the same time, so that a general-purpose press can be used, and no special equipment is required.

In FIGS. 1 (a) and 1 (b), the inner surface of the transfer die 17 and the outer surface of the mounting table 12 are left cylindrical without forming the teeth 14 and 18, and the work 11a is shown in FIG.
As shown in FIG. 4 (a), a cup-shaped product comprising a cylindrical portion 15a and a bottom plate portion 16a is used, and as shown in FIG.
3a (a flat belt pulley or the like) may be formed.

Another embodiment is shown in FIGS. 5A and 5B and FIG.

In this embodiment, a cup-shaped product 30 with holes is formed as shown in FIG. 6C, instead of the cup-shaped product 13 as in the previous embodiment. Fig. 5 (a)
5 shows a state before the press of the press device (the state of the work 37), and FIG. 5B shows a state after the press (the state of the product 30).

An axial force punch 31 is mounted on an upper base (not shown) of the press device. The axial force punch 31
The large-diameter portion 32, the middle-diameter portion 33, and the small-diameter portion 34 are formed in a columnar shape, respectively.
The guide member 36 is attached to the guide member 36 so as to be vertically guided.

A mounting table 38 for vertically mounting the work 37 formed in a cup shape with a hole in an open state is attached to the lower base 35 of the press device. The mounting table 38 comprises a donut-shaped annular cylindrical base conforming to the outer diameter and inner diameter of the finished product 30 shown in FIG. 6C, and has a tooth profile 41 meshing with a tooth profile 40 of a transfer die 39 described later on its outer surface. Is formed.

As shown in FIG. 6B, the work 37 has an outer cylindrical portion 42 having a rough tooth profile, a bottom plate 43 integrally formed at one end of the outer cylindrical portion 42 in a ring shape, and As shown in FIG.
As shown in (a), the material plate 45 having a hole is formed into a cup shape by ordinary press working. The work 37 is mounted on the mounting table 38 as shown in FIG.

As shown in FIG. 5A, a cylindrical transfer die 39 is arranged between the outside of the work 37 and the guide member 36. The transfer die 39 has a tooth profile 40 to be transferred to the work 37 formed on the inner peripheral surface thereof along the axial direction, and the outer peripheral surface is slidably contacted with the guide member 36, and is supported by the cushion pins 46 so as to be able to move up and down. I have. As a result, the transfer die 39 has the tooth profile 40 on the inner peripheral surface thereof.
Meshes with the tooth profile 41 on the side surface of the device like a spline, and is pushed up and down by the axial force punch 31.

A plurality of cushion pins 46 are arranged at predetermined intervals in the circumferential direction of the transfer mold 39, and are each mounted on the lower base 35 so as to be freely retractable by a spring or the like. That is, as shown in FIG. 5 (a), when the cushion pin 46, which is normally protruded, moves the upper base close to the lower base 35 and the axial force punch 31 pushes the transfer mold 39 downward, the cushion pin 46 moves accordingly. As shown in (2), the work 37 is immersed in the lower base 35 and the work 37 can be compressed.

As shown in FIG. 5 (a), the work 37 is transferred with the upper table moved upward to be separated from the lower table 35 and the axial force punch 31 separated from the transfer mold 39 and the mounting table 38. It is accommodated in a mold 39 and placed on a placing table 38. Thereafter, the upper base is lowered, and the small-diameter portion 34 of the axial force punch 31 is inserted into the inner cylindrical portion 44 of the work 37. Thereby, the inside of the work 37 and the large diameter portion 32 of the axial force punch 31 are formed.
, The side surface and the lower surface of the middle diameter portion 33, and the small diameter portion 34
, A ring-shaped compression chamber 47 is defined. At this time, the lower surface of the middle diameter portion 33 and the end surface of the inner cylindrical portion 44 of the work 37 are separated.

The compression chamber 47 is filled with oil (or water) by the filling means 22. The filling means 22
Since the configuration is the same as that of the previous embodiment, each component is denoted by the same reference numeral, and description thereof is omitted. The pressure of the oil in the compression chamber 47 is maintained at a predetermined pressure by the relief means 26. Since the relief means 26 has the same configuration as that of the previous embodiment, each component is denoted by the same reference numeral and description thereof is omitted.

According to the above-described configuration, FIG.
6 (b), when the upper base of the press apparatus is brought close to the lower base 35, the cup-shaped work 37 with a hole shown in FIG. 6 (b) is seated by the outer cylinder 42 being pressed by the axial force punch 31 in the vertical direction. The outer cylinder portion 42 is pressed against the outer transfer die 39 by the oil that is filled in the compression chamber 47 and is compressed and pressurized at the same time as the pressurization, so that it buckles as shown in FIG. 6C. And the outer cylinder portion 42
The tooth profile 40 of the transfer mold 39 is accurately transferred to the outer surface of the mold.

At this time, a cup-shaped work 37 having a hole is used.
The mounting plate 38 and the small-diameter portion 3 of the axial force punch 31 are formed by pressing the bottom plate portion 43 and the inner cylindrical portion 44 with oil.
As shown in FIG. 5B, when the product 30 is pressed, the corners 48 are sharply formed. 5 (a) to 5 (b), the end 49 of the inner cylindrical portion 44 of the work 37 is pressed against the lower surface of the middle diameter portion of the axial force punch. The thickness can be increased.

It is to be noted that the descending stroke of the axial force punch 31 (press stroke of the pressing device) is adjusted or the step length between the large diameter portion 32, the medium diameter portion 33, and the small diameter portion 34 of the axial force punch 31 is changed. FIG. 5A shows the position of the lower surface of the middle diameter portion 33 at the lowest point of the stroke of the axial force punch 31.
If the end face of the inner cylindrical portion 44 of the work 37 is set as shown in FIG. 5, the thickness of the inner cylindrical portion 44 of the work 37 can be prevented from increasing.

As described above, when the volume of the compression chamber 47 is reduced by the axial force punch 31 and the oil in the compression chamber 47 is compressed and pressurized, the oil becomes larger between the end face of the outer cylindrical portion 42 of the work 37 and the axial force punch 31. Although the water leaks from between the lower surface of the diameter portion 32 and between the inner peripheral surface of the inner cylindrical portion 44 of the work 37 and the outer peripheral surface of the small diameter portion 34 of the axial force punch 31, the former is outside the work 37. The end surface of the cylindrical portion 42 is sealed by being crushed by the lower surface of the large diameter portion 32 of the axial force punch 31,
In the latter case, since the inner cylindrical portion 44 of the work 37 is pressed inward in the radial direction by the pressurized oil and pressed against the outer peripheral surface of the small-diameter portion 34 of the axial force punch 31, the seal is actually leaked. do not do.

In this embodiment, as shown in FIGS. 5A and 5B, when the work 37 is compressed by the axial force punch 31 in the vertical direction, the transfer mold 39 is integrated with the work 37 by the cushion pin 46. Since it moves vertically in the vertical direction, the friction between the work 37 and the transfer mold 39 that are compressed as in the previous embodiment is reduced. Therefore, it is the same as the previous embodiment that the surface of the side surface of the product 30 after pressing becomes clean and the pressing force (pressing force) of the pressing device can be reduced by the amount corresponding to the reduced frictional resistance. Also, the point that a general-purpose press can be used is the same as in the previous embodiment.

In FIGS. 5 (a) and 5 (b), the outer peripheral surface of the small diameter portion 34 of the axial force punch 31 is formed into a tooth shape, and the inner peripheral surface of the mounting table 38 is formed into a tooth shape. If the engagement and the work 37a shown in FIG. 7A are used, an accurate tooth profile can be formed on the inner cylindrical portion 50a of the product 30a as shown in FIG. 7B. In FIGS. 5A and 5B, the inner surface of the transfer mold 39 and the outer surface of the mounting table 38 are left cylindrical without forming teeth, and the work 37b shown in FIG. 8A is used. If this is the case, a toothless product 30b can be formed as shown in FIG. Further, if only the outer peripheral surface of the small diameter portion 34 of the axial force punch 31 and the inner peripheral surface of the mounting table 38 have a tooth shape, the outer cylinder 51 as shown in FIG. Can be molded.

The ring gear-integrated drive plate 30d shown in FIG. 10 is similar to the product 3 shown in FIG.
0 (toothed cup-shaped product) is a cup whose depth is extremely shallow and widely changed in size.
The manufacturing method is the same as the manufacturing method shown in FIG. That is, the ring gear-integrated drive plate 30d includes a work 37 having a cylindrical portion between an upper base (not shown) and a lower base 35 of the press device shown in FIG.
Are arranged vertically, a gear-shaped transfer mold 39 is arranged outside the work 37, and a liquid (oil or water or the like) is filled inside the work 37. In this state, the upper table and the lower table 35 are brought close to each other, The work 37 is formed in such a manner that the work 37 is pressed against the outer transfer mold 39 by compressing and pressing the liquid while the work 37 is pressed vertically to increase the thickness.

As shown in FIGS. 10 and 11, the ring gear-integrated drive plate 30d is
5 (see FIG. 6 (a)).
00, a bottom plate portion 101 having the same thickness as the material plate 45, and a flange portion 102 having the same thickness as the material plate 45.
Then, as shown in FIG. 11, the plate 30d is positioned on the crankshaft 10 such that the flange portion 102 thereof is located on the back of the fluid coupling 103 of the automatic vehicle.
4 and fixed to the gear portion 1 with bolts 105.
At 00, the starter gear 106 is engaged when the engine is started.

This ring gear integrated drive plate 3
0d is a workpiece 37 obtained by pressing the material plate 45 shown in FIG.
, And are integrally manufactured by the steps shown in FIGS. 5A and 5B, so that they can be manufactured at low cost. Plate 3
As described above, the 0d gear portion 100 is formed by being pressed against the transfer mold 39 by the fluid pressure as described above, so that the accuracy is improved, and the strength is also improved since the gear portion 100 is pressed by the axial force punch 31 to be thick. That is, the drive plate 3
According to Od, the requirement of the gear unit 100, which requires the most precision and strength, can be satisfied, and the cost can be reduced.

Furthermore, since the ring gear-integrated drive plate 30d according to the present embodiment is formed while applying an internal pressure (fluid pressure), the gear portion 100 is less likely to buckle, and is therefore smaller than a conventional product manufactured by simple press working. The height of the teeth of the gear portion 100 can be increased. Further, in the conventional method (simply press working), a so-called “ironing process” is required in order to obtain the tooth shape accuracy of the gear portion 10. However, in the present embodiment, the tooth shape accuracy of the gear portion 100 is improved as described above. As a result, the "ironing process" is not required, and the process can be shortened. The work 37 does not have to be formed with a spare gear shape on the outer cylinder portion 42 as shown in FIG. 6B, but may be a simple cup shape without forming the spare gear shape.

FIG. 12 shows another embodiment.

In this embodiment, a stepped cylindrical product 53 is formed as shown in FIG. 13 (b) instead of the cup-shaped product 30 as in the previous embodiment. FIG. 12 (a)
Shows the state before the press of the press device (the state of the work 65), and FIG. 12B shows the state after the press (the state of the product 53).
Is shown.

An axial force punch 54 is mounted on an upper base (not shown) of the press device. The axial force punch 54
An inner peripheral surface is slidably inserted into a cylindrical guide member 57 attached to a lower base 55 of the press device with bolts 56, and an outer peripheral surface is slidable on a transfer die 58 mounted on the lower base 55. Has been inserted. The transfer mold 58 includes a block body 59 attached to the lower base 55.
And a large-diameter hole 60 formed in the block body 59 and a small-diameter hole 61 formed to be connected to the large-diameter hole 60.

The guide member 57 has a large-diameter portion 62 attached to the lower base 55 and a small-diameter portion 63 connected to the large-diameter portion 62. An annular seal member 64 for sealing between the small diameter portion 63 of the guide member 57 and the inner peripheral surface of the axial force punch 54 is provided. A work 65 shown in FIG. 13A is mounted between the guide member 57 and the transfer die 58.

The work 65 has a large-diameter cylindrical portion 66, a tapered cylindrical portion 67, and a small-diameter cylindrical portion 68 formed integrally, and the small-diameter cylindrical portion 68 is formed by the large-diameter portion 62 of the guide member 57 and the transfer mold 58. It is held between the small diameter hole 61. That is, in this embodiment, the large-diameter portion 62, the small-diameter hole 61, and the lower base 55 are
This constitutes a mounting table on which the work 65 is mounted.

The work 65 is formed by lowering the upper table of the press device 5
5 and move the axial force punch 54 to the transfer mold 5.
8 and the guide member 57 pulled out of FIG.
As shown in (a), it is accommodated in the transfer mold 58 and set. Thereafter, the upper base is lowered, and the axial force punch 54 is inserted between the transfer die 58 and the guide member 57. Thus, the ring-shaped compression chamber 6 is formed by the inside of the work 65, the lower surface of the axial force punch 54, and the outer peripheral surface of the guide member 57.
9 is defined.

The compression chamber 69 is filled with oil (or water) by the filling means 22. The filling means 22
Since the configuration is the same as that of the previous embodiment, each component is denoted by the same reference numeral, and description thereof is omitted. The oil pressure in the compression chamber 69 is maintained at a predetermined pressure by the relief means 26. Since the relief means 26 has the same configuration as that of the previous embodiment, each component is denoted by the same reference numeral and description thereof is omitted.

According to the above configuration, FIG.
When the upper stage of the press device is brought close to the lower stage 55 during 2 (b), the work 65 shown in FIG.
6 is pushed vertically by the lower surface of the axial force punch 54, and the large-diameter cylindrical portion 66 is about to buckle. Since the diameter cylindrical portion 66 is pressed against the outer transfer mold 58, the wall thickness is increased from the small diameter cylindrical portion 71 without buckling as shown in FIG. The shape of the transfer mold is accurately transferred.

At this time, since the tapered cylindrical portion 67 of the work 65 is pressed against the step 73 of the transfer mold 58 by the pressurized oil, the work 65 becomes a product after pressing as shown in FIG. At this time, the corner 74 is formed sharply. The outer peripheral surface of the axial force punch 54 and the transfer mold 58
If a workpiece 65a (with a large-diameter cylindrical portion 66a having a rough tooth shape) shown in FIG. 14 (a) is used to form a tooth shape on the inner peripheral surface of the
As shown in (b), a product 53a having a large-diameter portion 72a with teeth can be formed.

Another embodiment is shown in FIG.

This embodiment is not a cup-shaped product 13 as in the embodiment shown in FIG.
5 is formed. FIG. 15A shows a state before the press of the press device, and FIG. 15B shows a state after the press. Since this embodiment is substantially the same as the embodiment shown in FIG. 1, the same components are denoted by the same reference numerals and description thereof will be omitted. In this case, the work 76 has a toothed cylindrical shape excluding the bottom plate portion 16 from the work shown in FIG.

Another embodiment is shown in FIGS. 16 (a) and 16 (b).

This embodiment is different from the previous embodiments in that the tubular products 13, 30, 53a (FIGS. 2, 6, and 14) are used.
Instead of forming the teeth on the outer surface of the cylindrical product 90 (see FIG. 17), the teeth are formed on the inner surface 91 of the tubular product 90 as shown in FIG. FIG. 16A shows a state before the press of the press device, and FIG. 16B shows a state after the press.

An axial force punch 7 is provided on the upper base 77 of the press device.
8 is attached. The axial force punch 78 is formed of a cylindrical body, and its outer peripheral surface is slidably inserted into a mounting table 80 attached to a lower base 79 of a press device. The mounting table 80 includes a cylindrical guide portion 81 into which the axial force punch 78 is inserted, and a cylindrical mounting portion 83 on which a cylindrical work 82 is mounted. Inside the mounting portion 83,
A cylindrical transfer die 84 is provided slidably in the up-down direction.

On the outer peripheral surface of the transfer die 84, a tooth profile 85 to be transferred to the inner peripheral surface of the work 82 is formed along the axial direction. On the other hand, a tooth profile 86 meshing with the tooth profile 85 is formed on the inner peripheral surface of the mounting portion 83. The transfer die 84 is supported by a cushion pin 87 that is provided on the lower base 79 of the press device so as to be able to come and go. A cylindrical work 82 having a rough tooth profile formed on the inner peripheral surface is inserted into the transfer table 84 and mounted on the mounting table 80.

The work 82 is moved upward with respect to the lower table 79 with respect to the upper table 77 of the press apparatus, and the axial force punch 78 is pulled out from the guide section 81 of the mounting table 80, as shown in FIG.
As shown in (a), the transfer table 84 is placed on the placing section 83 of the placing table 80 in a state of being inserted through the transfer mold 84. After that, Uedai 77
Is lowered, and the axial force punch 78 is moved to the guide portion 8 of the mounting table 80.
Inserted into 1. Thus, a ring-shaped compression chamber 88 is defined by the outside of the work 82, the lower surface of the axial force punch 78, the inner peripheral surface of the guide portion 81 of the mounting table 80, and the upper surface of the mounting portion 83. .

The compression chamber 88 is filled with oil (or water) by the filling means 22. The filling means 22
Since the configuration is the same as that of the previous embodiment, each component is denoted by the same reference numeral, and description thereof is omitted. The oil pressure in the compression chamber 88 is maintained at a predetermined pressure by the relief means 26. Since the relief means 26 has the same configuration as that of the previous embodiment, each component is denoted by the same reference numeral and description thereof is omitted.

According to the above configuration, FIG.
When the upper base 77 of the press apparatus is brought closer to the lower base 79 during 6 (b), the cylindrical work 82 is pressed in the vertical direction by the axial force punch 78 and tends to buckle. Since the oil is filled into the inside 88 and pressed against the inner transfer mold 84 by the oil which is compressed and pressurized at the same time as the pressing, the wall thickness is increased without buckling, and as shown in FIG. Tooth shape 8 of transfer mold 84
5 is accurately transferred.

[0073]

As described above, according to the method and the apparatus for forming a cylindrical body according to the present invention, the thickness of a work having a cylindrical portion can be increased without buckling and the inside or outside of the work can be increased. The shape of the transfer mold can be accurately transferred to either one of the surfaces. Further, a ring gear-integrated drive plate having high precision and strength of the gear portion can be realized at low cost.

[Brief description of the drawings]

FIG. 1 is a schematic view of an apparatus for forming a cylindrical body according to an embodiment of the present invention, in which FIG. 1 (a) shows a state before pressing and FIG. 1 (b) shows a state after pressing.

FIG. 2 (a) is a perspective view of a work set in the molding apparatus, and FIG. 2 (b) is a perspective view of a product manufactured by the molding apparatus.

FIG. 3A is a partial sectional view of the work, and FIG. 2B is a partial sectional view of the product.

FIG. 4 (a) is a perspective view of another work, and FIG.
(b) is a perspective view of another product.

5 is a schematic view of a cylindrical body forming apparatus according to another embodiment, in which FIG. 5 (a) shows a state before pressing and FIG. 5 (b) shows a state after pressing.

6 (a) is a perspective view of a material plate, FIG. 6 (b) is a perspective view of a work set in the molding apparatus, and FIG. 6 (c) is manufactured by the molding apparatus. FIG.

FIG. 7A is a perspective view of another work, and FIG.
(b) is a perspective view of another product.

8 (a) is a perspective view of still another workpiece, and FIG. 8 (b) is a perspective view of another product.

FIG. 9 is a perspective view of still another product.

FIG. 10 is an explanatory view of a ring gear integrated drive plate showing one embodiment of the present invention.

FIG. 11 is an explanatory view showing a state where the ring gear-integrated drive plate is attached to a drive system of a vehicle.

12 is a schematic view of a cylindrical body forming apparatus according to another embodiment, in which FIG. 12 (a) shows a state before pressing and FIG. 12 (b) shows a state after pressing.

FIG. 13A is a perspective view of a work set in the molding apparatus, and FIG. 13B is a perspective view of a product manufactured by the molding apparatus.

FIG. 14 (a) is a perspective view of another workpiece, and FIG. 14 (b) is a perspective view of another product.

15 is a schematic view of a cylindrical body forming apparatus according to another embodiment, in which FIG. 15 (a) shows a state before pressing and FIG. 15 (b) shows a state after pressing.

FIG. 16 is a schematic view of a cylindrical body forming apparatus according to another embodiment, in which FIG. 16 (a) shows a state before pressing and FIG. 16 (b) shows a state after pressing.

FIG. 17 is a perspective view of a product manufactured by the molding apparatus.

FIG. 18 (a) is a perspective view of a cylindrical sheet metal toothed product, and FIG. 18 (b) is buckling when the end of the work is pressed to increase the accuracy of the tooth shape. FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper base 2 Axial force punch 10 Lower base 11 Work 13 Product 17 Transfer mold 21 Compression chamber 22 Filling means 30d Ring gear integrated drive plate

Claims (7)

[Claims] 1. A work having a cylindrical portion is vertically arranged between an upper base and a lower base of a press device, a transfer die is arranged outside the work, and a liquid is filled inside the work. And forming the cylindrical body by pressing the work against the outer transfer mold by compressing and pressing the liquid while vertically increasing the wall thickness by pressing the work vertically. Method. 2. A work having a cylindrical portion is vertically arranged between an upper base and a lower base of a press device, a transfer die is arranged inside the work, and a liquid is interposed compressably by the upper and lower bases on the outside. In this state, by bringing the upper table and the lower table close to each other, the work is pressed in the vertical direction and the liquid is compressed and pressed while the wall thickness is increased to press the work against the inner transfer mold. Method of forming a cylindrical body. 3. The method for forming a cylindrical body according to claim 1, wherein the transfer die is moved in the vertical direction integrally with the work in accordance with the vertical pressing of the work. 4. A mounting table on which a work having a cylindrical portion is mounted vertically, a transfer die arranged outside the work, filling means for filling a liquid inside the work, and an end face of the work. An axial force punch for compressing the liquid while pressing the liquid in the vertical direction. 5. A mounting table for vertically mounting a work having a cylindrical portion, a transfer die disposed inside the work, and a compression chamber partitioned and formed outside the work to store a liquid in a compressible manner. And a filling means for filling the compression chamber with a liquid, and an axial force punch for compressing the liquid in the compression chamber while vertically pressing the end face of the work. . 6. The molding of a cylindrical body according to claim 4, wherein the transfer die moves in the vertical direction integrally with the work in accordance with the vertical pressing of the work by the axial force punch. apparatus. 7. A work having a cylindrical portion is vertically arranged between an upper base and a lower base of a press device, a gear-shaped transfer die is arranged outside the work, and a liquid is filled inside the work. By bringing the upper table and the lower table close to each other, the work is formed by pressing the work vertically and increasing the thickness while compressing and pressing the liquid to press the work against the outer transfer mold. Ring gear integrated drive plate.