KR100302082B1 - Rotary Forging Device - Google Patents

Abstract

The axial line of the first mold 301 is inclined so that one side of the bus bar of the pressing end surface is substantially horizontally facing the pressing end surface of the first mold 301 and the pressing end surface of the second mold 302 so as to face each other. The work 10 is pressed between the pressurized end face and the pressurized end face, and the first mold 301 and the second mold 302 are synchronously rotated to face each other at the same time so as to push the work 10 down. In the rotary forging device in which the material protruding from the unloading is trimmed by the forming roller and the rim portion 11 by these molds, the disk portion is formed when the rimmed disc including the rim portion 11 composed of the small portion and the large portion is formed. Prevent the crack of (1) and the burr of the rim 11.

A rim molding part for shaping the shaping part is formed at the outer circumference of the pressurized end face for disk shaping of the second mold 302, and an annular wall 32 for forming the edge of the shaping part is formed at the outer circumference of the rim molding part. 1 The molding roller 2 which protrudes toward the metal mold 301 side, and is freely supported by rotation, enters or approaches the upper end of the said annular wall 32. As shown in FIG.

Description

Rotary Forging Device

1 is an explanatory diagram of a first step of the conventional example;

2 is an explanatory diagram of a second step of the conventional example;

3 is an explanatory diagram of a conventional apparatus in the case of forming a product in which the rim portion 11 is asymmetric with respect to the disc portion 1,

4 is an explanatory diagram showing the relationship between the reduction zone 101 and the rough forming roller 21 in this case;

5 is an explanatory diagram of a device of Embodiment 1 of the present invention;

6 is an explanatory diagram of an intermediate process in the case of molding using the apparatus of Example 1,

7 is an explanatory diagram of a molding completed state,

8 is a cross-sectional view of a rimmed disk formed by this embodiment 1,

9 is a sectional view of principal parts of the apparatus of Example 2,

10 is an explanatory diagram of an intermediate process of molding according to this embodiment;

11 is an explanatory diagram of a molding completed state,

12 is an explanatory diagram of a modification of the second embodiment;

13 is an explanatory diagram of the apparatus of the third embodiment;

14 is an explanatory diagram of an intermediate process of molding according to this embodiment;

Fig. 15 is an explanatory diagram of spinning

16 is a partial cross-sectional view of a wheel for an automobile manufactured according to this embodiment,

17 is an explanatory diagram in the case of controlling the position of the forming roll 2 in the up-down direction and the left-right direction,

18 is an explanatory diagram showing a state in which the workpiece 10 formed by forging is usually set in the second mold 302;

19 is an explanatory diagram of a molding completed state thereof,

* Explanation of symbols for main parts of the drawings

301: upper mold 302: lower mold

10: work 11: limb

31: annular groove 2: forming roller

1: disk unit

[Industrial use]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary forging apparatus, and more particularly, to a rotary forging apparatus for producing a rim with a rim formed of a large rim portion and a small rim portion at a peripheral edge of the disk portion.

[Prior technology and problem]

As a method or apparatus for forming the rim portion 11 at the circumferential edge of the disc portion 1 by rotating forging, it is already disclosed in Japanese Patent Laid-Open No. 61-226132.

As shown in Fig. 1, the rotary forging method includes a pressurized end face and a second end face of the first mold 301 which rotates a thick disk-like material or a short cylindrical material (hereinafter referred to as the workpiece 10) in synchronous rotation. The disk portion 1 and the rim portion 11 are interposed between the pressurized end surfaces of the mold 302 in the final shape using the pair of molds. And these processes are hot-processed normally.

The pressurizing end surface of the said 2nd metal mold | die 302 is set to the shape suitable for the lower surface of the disk part 1, and the inner peripheral surface below the rim part 11. As shown in FIG. The rotation axis of the other 1st metal mold | die 301 inclines a little (for example, 2 to 5 degrees) with respect to the rotation axis of the said 2nd metal mold | die 302, and the pressurization cross section is substantially conical as a whole. And the vertex angle of the said conical surface is determined so that one quadrilateral of the longitudinal section of this conical surface may become horizontal. In addition, the shape of the quadrilateral of the longitudinal section of the conical surface of the said 1st metal mold | die 301 corresponds to the shape corresponded to a part of upper surface of the cross section of the disk part 1. As shown in FIG.

In addition, the composition roller 21 and the final molding roller 22 are alternately inserted in the boundary between the two dies.

In the prior art, in the first step, as shown in FIG. 1, the composition roller 21 is interposed at the boundary between the first mold 301 and the second mold 302. In this state, the workpiece 10 is pressurized by both of the molds and rotated and forged. In a 2nd process, as shown in FIG. 2, the rim part 11 is finished using the final forming roller 22. As shown in FIG.

In the first step, the first die 301 is pressed down to the final position toward the second die 302 side. As a result, an annular rim equivalent portion 110 having a rectangular quadrangular cross section formed by the composition roller 21 is molded at the edge of the disc portion 1 of the final shape.

In the second step, the disk portion 1 and the rim equivalent portion 110 are pinched by the first mold 301 and the second mold 302 (but not pressed down). ), And the final forming roller 22 is pressed against the rim equivalent portion 110 while synchronously rotating these molds.

As a result, as shown in FIG. 2, the rim equivalent portion 110 is trimmed to the rim portion 11 of the final shape.

As described above, in this conventional method, the process from forming the work 10 to the final disc with the rim stores the work 10 in the first mold 301 and the second mold 302. Since the processing can be carried out, the productivity is good.

In this conventional method, however, a product having a shape in which the cross-sectional shape of the rim portion 11 is symmetrical with respect to the disk portion 1 can be molded, as shown in the rope-shifting ring, as shown in FIG. It is not possible to form a product in which the cross-sectional shape of (11) is asymmetrical with respect to the disk portion 1.

This is because, when the rim equivalent portion 110 is molded by the first conventional process described above, a group sequence occurs at or near the center portion of the disc portion 1.

This is due to the following reasons:

Although the 1st metal mold | die 301 is pressed down to the 2nd metal mold | die 302 side, the workpiece | work 10 is pressed down and flattened. And the outer peripheral surface of the workpiece | work 10 is shape | molded by the surface of the composition type roller 21. As shown in FIG. In the workpiece | work 10 at this time, the range pressed by the pressurizing end surface of the 1st metal mold | die 301 becomes a fan shape like FIG. And the composition type roller 21 treats in the center of the circular arc-shaped outer peripheral surface of this fan-shaped rolling station 101. As shown in FIG. The work 10 tries to flow outward in the radial direction as the first die 301 is pressed down, but the flow is blocked by the treatment of the compositional roller 21.

However, since the said flow is not inhibited in the workpiece | work 10 at both the outer peripheral surface of this pushing down area 101 and the welding part of this composition type roller 21, it swells radially outward like the same figure. Therefore, in the cross section of the inner part of the fan-shaped rolling region 101, the compressive force in the radial direction and the total rolling force to be discharged between the outer circumferential surface of the work 10 passes through the composition roller 21 It will be repeated. As a result, it is thought that a crack occurs in the inner part of the fan-shaped rolling region 101 or its vicinity.

Moreover, in this conventional method, a raw material spreads along with the progress of the pushing down of the workpiece | work 10 by the 1st metal mold | die 301 and the 2nd metal mold | die 302, and a part protrudes from a disk shaping | molding part.

After the protrusion grows and reaches the surface of the composition roller 21, it is almost evenly distributed in the vertical direction in the space surrounded by the first mold 301, the second mold 302 and the composition roller 21. It is separated and charged.

By the way, as shown in FIG. 3, a raw material is filled between the composition roller 21 and the 1st mold 301 in the rolling process of the first half. At this time, the material is not filled between the composition roller 21 and the second mold 302. In this state, when the second pressing step is performed until the material is filled between the compositional roller 21 and the second mold 302, the rim equivalent portion 110 is formed. In the subsequent pressing step, Since the raw material is pushed even more between the compositional roller 21 and the first mold 301 which are already filled with the raw material, the pressure of this part becomes excessively high, and the first mold 301 and the compositional roller ( 21) The material comes out from a slight gap between. As a result, a large amount of burrs are generated at one end of the rim of the product.

The present invention has been made in view of such a point, and the "concave pressure end face of the first mold 301 and the pressure end face of the second mold 302 are opposed to each other, and An axis is inclined with respect to the axis of the 2nd metal mold | die 302, the workpiece | work 10 is interposed between the pressure end surface of these 1st metal mold | die 301, and the pressure end surface of the 2nd metal mold | die 302, and the said two The workpiece 10 is pressed down while the mold is rotated synchronously, and the work piece 10 is pressed to form the disk 1, and the disk which protrudes outward from the pressing area is formed by the forming roller 2 and the two molds. In the rotary forging device which is hard to finish with the rim part 11 connected to the part ", even when the rim part 11 consists of a large-shape part and a bushing part which are asymmetric with respect to the disc part 1, the center part of the disc part 1 is carried out. Or cracks in the vicinity and burrs at the rim end To provide a rotary forging apparatus which can be prevented by the task.

[Invention of Claim 1]

[(Technical means]

The technical means of the present invention for solving the above problems is to form a "rim forming part for shaping a shaping part in the outer peripheral part of the pressurizing end surface for disk shaping of the 2nd metal mold | die 302, and to shape the edge part of the shaving part. The annular wall 32 for protruding from the outer circumferential edge of the rim molding portion to the first mold 301 side so that the forming roller 2 freely supported by rotation is welded or approached to the upper end of the annular wall 32. " will be.

[Action]

The technical means act as follows.

When the work 10 is pressed down by the first mold 301 and the second mold 302, the work 10 is flattened with the progress of the reduction, and the material is moved outward from the pressurized end face of the die mold. Extrude

Then, the protruding material grows outward, and its tip reaches the trunk portion of the forming roller 2. The protruding material is bent or extended in the axial direction by the trunk portions of the first mold 301 and the second mold 302 and the forming roller 2 to be molded into the rim portion 11.

A rim molding part for shaping is formed in the outer peripheral part of the pressurizing end surface for disk shaping | molding of the 2nd metal mold | die 302, and the annular wall 32 for shaping the edge of the said shaping part is formed in the outer peripheral edge. Further, the forming roller 2 is freely supported by rotation by welding or approaching the upper edge of the outer circumferential wall 32. Therefore, in the initial stage of forming the rim 11, a part of the protruding material is surrounded by the rim forming part of the second mold 302, the annular wall 32, and the end face of the forming roller 2. It is charged in the stacked space.

Thereafter, when the reduction of the work 10 proceeds further, the amount of the protruding material increases, but the flow of the material to the rim forming portion of the second mold 302 is blocked by the outer circumferential wall 32, and the forming roller 2 ), And the protruding material flows to the side of the forming part of the Daelim part by roll forming by the trunk parts of the first and second molds 301 and 302.

Then, when the final pressure is reduced, both sides of the disk portion 1 are molded by the pressing end surface of the first mold 301 and the pressing end surface of the second mold 302, and at the same time, a rim portion 11 consisting of a bore portion and a bushing portion. ) Is molded.

Further, in the case where the cross-sectional shape of the rim portion 11 is bent in a complex manner such as an automobile wheel, the shape of the body portion of the first mold 301 and the shape of the body portion of the forming roller 2 are determined accordingly. .

[(effect]

In the initial stage of rotation forging in which the shaping of the bushing is completed, the end of the bushing is restrained over the entire circumference by the outer circumferential wall 32. In the outer circumferential restraint state, when the subsequent forging process is executed, the workpiece 10 located between the first mold 301 and the second mold 302 is mainly located on the first mold 301 side. Only material is shown. Therefore, after the point of time at which the outer circumferential restraint state is obtained, it is not suitable as in the prior art, that is, not suitable such as repeated compression and leading edge in the radial direction at the end surface of the inner part of the fan-shaped pressing zone 101. Since this does not occur, cracks do not occur in the inner part of the fan-shaped rolling region 101 or in the vicinity thereof.

In addition, although the forming pressure of the rim forming portion for forming the shaving portion is increased to the extreme in the latter step of the forging, the burr is suppressed because the projecting material is in the outer circumferential binding state over the entire circumference.

[Other inventions]

In the invention of claim 1, in the invention of claim 1, the "molding roller 2 has a conical trapezoidal part, and the conical trapezoidal part is formed on the outer side of the boundary between the first mold 301 and the second mold 302. The diameter of the said conical trapezoid part is provided so that it may become small from the 2nd metal mold | die 302 toward the 1st metal mold | die 301 '.

Here, a part of the protruding material which comes out between the pressing end surface of the 1st metal mold 301 and the pressing end surface of the 2nd metal mold 302 accompanying the pressing of the workpiece | work 10 is a cone trapezoid of the shaping | molding roller 2 Treat Wealth Since the trunk portion diameter of the conical trapezoidal portion decreases toward the first mold 301 side, the gap between the outer peripheral edge of the pressurized end face of the first mold 301 and the body portion of the forming roller 2 is reduced at the initial stage of pressing. It is large and accompanies the progress of pressing, and the said gap becomes small gradually. As a result, the thick thickness of the rim equivalence formed by being rolled up upward by the first mold 301 and the forming roller 2 in the initial stage of pressing down gradually becomes thinner as it approaches the disk portion 1 from the upper end portion. . Thus, in the thing of Claim 2, the thick thickness of the front end side of the annular body extended long with respect to the disk part 1 can be set thicker with respect to the base end part.

According to the invention of claim 3, in order to manufacture the wheel for the automobile by the rotation forging apparatus of the invention of claim 1, "The shape of the rim forming portion in the pressurized end surface of the second mold 302 is the outer side of the disc portion 1 of the wheel for automobiles. According to the shape of the inner circumferential surface of the outer rim 12 and the side surface of the rim flange 121 subsequent to the flat portion, the shape from the pressurized end surface of the first mold 301 to the trunk portion is the inside of the disk portion 1. In accordance with the shape of the inner portion of the disk portion 1 of the inner peripheral surface of the lower portion 13 in the flat portion, the body portion of the forming roller 2 is formed on the outer peripheral surface of the outer forest 12 and the inner surface of the rim flange 121 subsequent thereto. Suitable outer forest forming section 25 is installed. As a result, at the end of the forging of the wheel, both front and rear surfaces of the disk portion 1 of the wheel for the vehicle are formed, and at least up to the entire portion of the outer rim 12 and the vicinity of the disk portion 1 of the lower portion 13 of the rim section. Can be molded in one step.

According to the invention of claim 4, in the invention of claim 3, " the radial direction of the second mold 302 and the rotation axis in the state in which the molding roller 2 is maintained in an upright position parallel to the axis of the second mold 302. It is movable in a direction parallel to the line. By adjusting the positions of the forming rollers 2 with respect to the first mold 301 and the second mold 302 up, down, left and right, adjustment of the thick thickness of the rim portion is possible.

In addition, as in the invention of claim 5, in the case of `` a concave-convex shaping portion coinciding with the concave-convex portion of the disc portion 1 is formed in a predetermined range of the pressurized end surface of the second mold 302 '', When the rim flange 121 is formed, the outer circumferential side is constrained by the outer circumferential wall 32, so that the material of the work 10 is reliably filled in the concave-convex shaping portion by subsequent pressing.

Therefore, the uneven portion formed on the surface of the disc portion 1 is exactly the uneven shaped portion of the second mold 302. As a result, molding precision is improved.

EXAMPLE

Next, the above-described embodiment of the present invention will be described in detail with reference to the drawings.

Embodiment 1 shown in FIGS. 5-7 is for manufacturing the product which provided the cylindrical rim part 11 in succession to the outer periphery of the disk-shaped disc part 1 as shown in FIG. An embodiment of the rotary forging device.

The rim portion 11 of this product includes a flange portion 14 provided at a position slightly inclined with respect to the disc portion 1, and a rim body 111 extending in the axial direction from the inner circumferential end of the flange portion 14. Is made of.

The axis of rotation of the second die 302 is upright, and a flat portion corresponding to the outer surface of the disk portion 1 is formed on the pressing end surface thereof, and an annular groove 31 is formed on the outer peripheral side thereof to open upward. The cross-sectional shape of the annular groove 31 is set to a dimension corresponding to that of the flange portion 14.

The 1st metal mold | die 301 is set in the shape of the cone of which the vertex angle of the pressing end surface is big, and the trunk | drum is formed in the shape of the cone trapezoid whose upper end part is smaller than the lower end part. The axis line of this 1st mold 301 is set in the state inclined about 2-5 degree with respect to the axis line of the 2nd metal mold | die 302, and lifting is freely supported in this inclination state. And this 1st metal mold | die 301 is designed so that one bus bar of the said pressurizing end surface may become substantially horizontal, and one bus bar of the trunk | drum part becomes substantially vertical in the said inclined state. Further, the vertex portion of the conical surface of the pressing end face of the first mold 301 coincides with the rotation axis of the second mold 302. A cylindrical forming roller 2 is freely supported on the outer side of the boundary portion when the pressing end surface of the first mold 301 and the pressing end surface of the second mold 302 are closest to each other. 302 is movable in the radial direction. Then, a slight gap (for example, 0.2 mm to 1 mm) is formed between the lower surface of the forming roller 2 and the upper end of the outer circumferential wall 32 outside the annular groove 31.

The first mold 301 and the second mold 302 are driven by the drive device 4 via the transmission device 41. The first mold 301 and the second mold 302 are rotated synchronously in the same direction by the transmission device 41. Moreover, the 2nd metal mold | die 302 is rotationally driven by a fixed position, and the 1st metal mold | die 301 is driven up and down by predetermined | prescribed timing by the elevating drive apparatus 5. Moreover, this 1st metal mold | die 301 is freely supported by the shaft support part 51 of the output part of the said elevating drive apparatus 5, and this shaft support part 51 has mentioned the 1st mold 301 as mentioned above. At the same time, the rotation is freely supported by the tilting posture.

Moreover, the guide shaft 52 which extends up and down penetrates through the said shaft support part 51, and the shaft support part 51 moves up and down according to advancing of the output shaft of the elevation drive apparatus 5 at a constant posture.

Further, the transmission device 41 includes a first gear transmission mechanism 42 for transmitting the output shaft of the drive device 4 and the rotation shaft of the first mold 301, and a rotation drive for the second mold 302. It consists of the 2nd gear transmission mechanism 43 and the transmission mechanism 44 which consists of a pulley transmission apparatus or a chain transmission apparatus which electric-drives the input shaft of this 2nd gear transmission mechanism 43, and the output shaft of the drive apparatus 4. As shown in FIG. Then, the transmission ratio and the transmission direction of the respective transmission mechanisms are determined so as to synchronously rotate the first mold 301 and the second mold 302 in the same direction.

Moreover, the output shaft of the said drive device 4 is comprised by two axes in series, and the expansion-contraction is connected freely by the spline fitting part 45. As shown in FIG. Therefore, the 1st metal mold | die 301 can lift up and down, maintaining the electrically-driven state with the drive apparatus 4.

According to this embodiment, in manufacturing the product shown in FIG. 8, as shown in FIG. 5, between the pressurized end surface of the 1st metal mold 301, and the pressurized end surface of the 2nd metal mold 302, as shown in FIG. A thick disk-shaped or cylindrical-shaped workpiece 10 is interposed therebetween.

Then, the molding roller 2 is moved inward to fix the body portion at a position corresponding to the outer circumferential surface of the rim main body 111.

In this state, the drive device 4 is driven to lower and drive the lift drive device 5 while synchronously rotating the first mold 301 and the second mold 302. Thereby, the 1st metal mold | die 301 moves to the 2nd metal mold | die 302 side, and presses the workpiece | work 10 between the pressurized end surface of the 1st metal mold 301, and the pressurized end surface of the 2nd metal mold 302. As shown in FIG. Then, the work 10 is flattened, and the outer peripheral edge part thereof gradually protrudes from the boundary of these molds. And this protruding protrusion material is shape | molded by the shaping | molding roller 2 to the cross-sectional annular body extended up and down.

When the reduction proceeds, as shown in Fig. 6, the lower annular body grows and penetrates into the annular groove 31. As shown in FIG. And this below-mentioned annular body finally fills the space | interval part comprised by the shaping | molding roller 2 and the annular flaw 31, and the flange part 14 is shape | molded. The upper annular body grows upward as it is.

Further, when the reduction proceeds, plastic deformation such that only the length in the axial direction of the upper annular body extends as the flange portion 14 is molded. At this time, since the outer circumferential portion of the flange portion 14 is in a state constrained by the outer circumferential wall 32, the pressure reduction region 101 between the pressurized end surface of the first mold 301 and the pressurized end surface of the second mold 302. ), The difference between the compressive force and the leading force generated in the material becomes extremely small. Therefore, in this rotation forging process, there is no crack in the pressing section 101, either.

Then, in the final pressure reduction state, the material between the pressurized end surface of the first mold 301 and the pressurized end surface of the second mold 302 becomes the disk portion 1 of a set thickness, and extends upward from its outer periphery. The normal portion to be the rim main body 111. By the above, the product of FIG. 8 is produced.

Example 2

In the embodiment shown in FIGS. 9 to 11, the cross-sectional shape of the rim main body 111 is thick using the first mold 301 and the second mold 302 which are exactly the same as those of the first embodiment. It is a rotary forging apparatus which can be formed into an approximately triangular shape whose base end portion is thin in thickness.

The forming roller 2 employed in this embodiment is conical trapezoidal in shape. And the cross section below this shaping | molding roller 2 opposes the edge of the outer peripheral wall 32 with a very slight clearance. In the initial state in which the workpiece 10 is interposed between the pressurized end surface of the first mold 301 and the pressurized end surface of the second mold 302, the pressurized end surface of the first mold 301 is formed by the forming roller 2. Is located above the middle of the trunk,

When the workpiece 10 is molded using this rotary forging device, in the initial stage of the rotary forging, the first mold 301 immediately after the protruding material protruding from both molds is welded to the trunk portion of the forming roller 2. The distance α between the pressurized end face of the mold and the trunk portion of the forming roller 2 coincides with the thick thickness of the tip portion of the rim main body 111 (see Fig. 9).

Further, as the work 10 is pressed, a part of the protruding material is filled in the space formed by the annular groove 31 and the forming roller 2, just as in the first embodiment, so that the flange portion 14 is formed. do. The other part moves to the annular part side opposite to the said flange part 14, and this annular body grows in an axial direction (refer FIG. 10).

At this time, since the position of the pressurized end surface of the 1st metal mold | die 301 falls, the space | interval of this pressurized end surface and the trunk | drum of the shaping | molding roller 2 becomes small gradually. Therefore, the thick thickness at the proximal end of the annular portion gradually decreases. Then, as shown in FIG. 11, the interval between the pressurized end surface of the first mold 301 and the trunk portion of the forming roller 2 when the first mold 301 reaches the final lowering position is minimized, and this interval is minimized. It becomes thick thickness of the base end part of this rim main body 111. As shown in FIG. Therefore, the cross section of the rim main body 111 becomes substantially triangular shape.

In addition, the shape of the trunk | drum of the shaping | molding roller 2 may be made into the shape in which the cylinder 24 was provided in succession below the conical trapezoid part 23, as shown in FIG. In this case, in the state where the pressure cross section of the first mold 301 coincides with the cylindrical portion 24, the portion of the rim main body 111 formed by the first mold 301 and the forming roller 2 is formed. The thick thickness becomes constant. Therefore, the rim main body 111 of the shape which becomes thick at the front end side here is formed in the thick thickness which a certain range is constant from the disk part 1 of a product.

Example 3

In this embodiment, as shown in FIG. 16, a drop center portion 15 is provided in succession at the circumferential edge of the disc portion 1, and the rim portion includes a small outer rim 12 and a large rim 13 in its entirety. It is an apparatus for manufacturing the wheel for automobiles of the type provided with (11).

The side wall on the outer rim 12 side of the drop center portion 15 is an annular wall substantially perpendicular to the axis of the wheel, and the disk portion 1 is located in the vicinity of the side wall. On the other hand, the side wall on the lowering 13 side of the drop center portion 15 is a tapered surface 151. Tire seal portions 132 and 132 are formed outside the drop center portion 15.

Further, in the apparatus of this embodiment, the intermediate product before molding into the shape of the same drawing is molded.

The 1st metal mold | die 301, the 2nd metal mold | die 302, and the shaping | molding roller 2 of this rotary forging apparatus are the structure shown in FIG.

The pressing end surface of the second die 302 is formed with a pressing face corresponding to the outer flat portion of the disc 1. The press-molded surface is provided with a concave-convex shaping portion 16 corresponding to the concave-convex portion formed on the outer flat portion of the disk portion 1. The shape of the outer circumference thereof corresponds to the shape of the inner circumferential surface of the outer rim 12 and the side surface of the rim flange 121 subsequent thereto from the circumferential edge of the disc portion 1, and further on the outer circumference of the rim flange 121. An annular outer circumferential wall 32 having a height almost equal to the thickness is formed.

The shape of the pressurized end surface of the first mold 301 has a substantially conical shape corresponding to the shape of the inner flat portion of the disk portion 1 as in the first embodiment. And the shape of a trunk | drum is formed smaller than the diameter of an upper part, and is substantially cone shape as a whole.

The shape from the pressurized end face to the lower part of the body coincides with the shape up to the tapered surface 151 of the lowering 13. And the shape of a trunk-shaped part becomes the taper surface formation part 33 corresponding to the said taper surface 151,

The forming roller 2 has a cylindrical upper portion, and the lower portion thereof is an outer forest forming portion 25 conforming to the shape from the outer circumferential surface of the outer forest 12 to the inner surface of the rim flange 121.

Then, in manufacturing the wheel for automobiles using the apparatus, the lower end surface of the forming roller 2 is placed at a height position having a slight gap with the upper end of the outer circumferential wall 32, and the forming roller 2 is The trunk portion is fixed at a position corresponding to the outer circumferential surface of the rim portion 11 of the product, and is forged by rotating the disk-shaped work 10 between the first mold 301 and the second mold 302.

Then, in the initial stage of the rotation forging, the outer rim 12 from the disk portion 1 to the rim flange 121 is formed into the final shape by the outer rim molding portion 25 and the second mold 302. In the subsequent step, the material protruding from the boundary between the first mold 301 and the second mold 302 flows upwardly to form the lowering equivalent portion 130 corresponding to the lowering 13 (FIG. 14). Reference).

When the lowering equivalent portion 130 is molded, the protruding material from the boundary between the first mold 301 and the second mold 302 is formed on the base of the molding roller 2 and the body of the first mold 301. It is formed in a cylindrical shape by the vicinity of the bottom of the part. As the reduction of the work 10 proceeds, the cylinder extends in the axial direction. By the way, there is a tapered surface forming portion 33 corresponding to the tapered surface 151 in the middle of the trunk portion of the first mold 301, and the cylindrical portion is flared and formed in the tapered cylinder portion as it grows in the axial direction. ,

In the state in which the first die 301 is lowered to the bottom dead center position (the state in which the workpiece 10 is most pressed), as shown in FIG. 14, the outer rim 12 of the disc portion 1 and the rim portion 11 is shown. ) Is shaped into the final shape. In addition, the lower equivalent portion 130 formed inside the disc portion 1 is formed in the final shape of the drop center portion 15 and the tapered surface 151, the end portion is formed as it is in the unprocessed tapered portion .

In the molding completion state, the outer surface of the disk portion 1 is finished by the uneven shaped portion 16 to the final uneven portion, but when the uneven portion is molded, the outer peripheral portion of the rim portion subsequent to the uneven portion is formed on the outer circumferential wall 32. Since it is restrained by this, this uneven part is shape | molded correctly.

Thus, when the front end side of the lowering equivalence part 130 of the semi-finished state wheel is shape | molded to the tire seal part 132 of the lowering 13 by spinning, the lowering 13 is carried out. This wheel is molded into the final shape to complete the automobile wheel.

Furthermore, in this embodiment, in the state where the workpiece 10 is pressed down to the final thickness, the protruding length and the thickness of the lowering equivalent portion 130 are set to a value required to trim the lowering 13 to the final shape. Not to mention that. The thickness of the lowering equivalence part 130 may be set thicker than the thickness of the lowering 13, and may be shape | molded so that it may match with the thickness of the lowering 13 in the case of the spinning process for the said finish molding.

[Etc]

Aluminum, an alloy thereof, a magnesium alloy, or the like is used as the material of the work 10, and these angular rotation forging steps are executed by hot working.

In the above embodiment, an apparatus for forming the rim by holding the forming roller 2 in an upright position and simultaneously fixing it in a fixed position has been described. As shown in FIG. 17, the forming roller 2 is placed upright. Equipped with a drive device 6 for moving in the radial direction of the second mold 302 and in a direction parallel to the rotation axis in the state of maintaining the posture, the thickness of the rim portion is controlled by the drive device 6. Can be changed arbitrarily. In the case of this Example, when the outer peripheral surface of the shaping | molding roll 2 is set to the shape provided with a trapezoid part like the same figure, the change of thickness can be set complicated.

As shown in FIG. 18, the workpiece 10 may be formed by forming the uneven portion of the disc portion and the outer portion of the disc portion by ordinary forging molding or the like. This work is set in the 2nd metal mold | die 302 so that an outer-rim part may be accommodated in the annular groove 31. As shown in FIG. By performing rotation forging just as in the above embodiment, the outer forest 12 and the lower equivalent portion 130 as shown in FIG. 19 are formed.

This improves the formability in the rotational forging process by forming the composition-formed work 10, and also makes the outer circumferential binding state immediately after the start of molding, thereby improving the crack preventing effect of the disk.

Further, in the above embodiment, the case where the outer forest portion is located outside the outer surface of the disk portion 1 has been described as an example. However, depending on the shape of the product, the outer forest portion may be configured to match the outer surface of the disk portion 1, As shown in FIG. 17, it may be set as the structure located inward from the outer surface of the disk part 1. As shown in FIG.

Claims (5)

The conical pressurized end face of the first die 301 and the pressurized end face of the second die 302 are opposed to each other, and the axis of the first die 301 is inclined with respect to the axis of the second die 302. The workpiece 10 is interposed between the pressurized end face of the first mold 301 and the pressurized end face of the second mold 302, and the two molds are synchronously rotated to face each other so as to face the workpiece 10. While pressing down, the disk 1 is molded, and at the same time, the raw material protruding from the pressing area is finished with a frosted roller 2 and a rim 11 composed of a bushing part and a bushing part which are successively installed in the disk part by the two molds. In the rotary forging apparatus for forming a rim forming portion for shaping the shaping portion, the annular wall 32 for shaping the edge portion of the shaving portion is formed on the outer circumference of the pressing end face for forming the disk of the second mold 302. The first mold 30 at the outer edge of the rim molding portion 1) A forging apparatus, characterized in that the forming roller (2) protruding on the side to freely support the rotation to enter or approach the upper end of the annular wall (32). 2. The forming roller (2) according to claim 1, wherein the forming roller (2) has a conical trapezoidal portion, and the conical trapezoidal portion is provided outside the boundary of the first mold (301) and the second mold (302), and the diameter of the conical trapezoidal portion is The rotating forging device, characterized in that the configuration is smaller from the second mold (302) toward the first gold foil (301). 2. The inner circumferential surface of the outer rim 12 and the lateral side of the rim flange 121 according to claim 1, wherein the shape of the rim forming portion at the pressing end surface of the second mold 302 is formed from the outer surface portion of the disk portion 1 of the automobile. The shape from the pressurized end surface of the 1st metal mold | die 301 to a trunk part is matched with the shape of the shape of the disk part 1 of the vicinity of the said disk part 1 of the inner peripheral surface of the lowering 13 from the inner surface part of the said disk part 1 Matching in shape, the rotating forging device, characterized in that the outer peripheral surface of the outer rim (12) and the outer rim forming portion (25) suitable for the inner surface of the rim flange (l21) provided in the body portion of the forming roller (2). 4. The method according to claim 3, wherein the forming roller 2 is moved in the radial direction and the direction parallel to the rotation axis of the second mold 302 while maintaining the upright position parallel to the axis of the second mold 302. Rotary forging apparatus characterized in that enabled. 5. The rotary forging device according to claim 4, wherein an uneven shape portion corresponding to the uneven portion of the disc portion (1) is formed in a predetermined range of the pressure end surface of the second die (302).