JPH02299733A - Method and device for manufacturing wheel rim - Google Patents

Abstract

PURPOSE:To decrease the number of manufacturing process of a wheel rim and to improve the manufacturing efficiency by forming a flange part in the upper end part between the upper punch and a side die, and also, in the lower end part between the lower punch and the side die, at the time of descending of the upper die. CONSTITUTION:At the time of forming flanges F1, F2 in both end parts of a cylindrical body A, first of all, the lower end face of the cylindrical body A is supported by a supporting base 6 of a press equipment X, and in this state, a side die 7 is fitted externally to the outside peripheral surface of the cylindrical body A, and also, the upper die 1 is allowed to descend. Subsequently, on the way of descending of the upper die 1, first of all, the upper punch 2 is fitted internally to the upper part of the cylindrical body A and allowed to descend together with the cylindrical body A, the side die 7 and the supporting base 6. In this case, the upper end part of the cylindrical body A is pressed between the side die 7 and the punch 2, and the flange part F1 is formed in the upper end part. Subsequently, the upper die 1 descends as one body together with them, the lower end part of the cylindrical body A is pressed between the side die and the lower punch 4, and the flange F2 is formed in the lower end part. Accordingly, the flange is formed in the upper and part and the lower end part of the cylindrical body A by a single descent of the upper die.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method and apparatus for manufacturing a wheel rim for an automobile.

(Prior Art) As a wheel rim for an automobile, for example, one having the shape shown in FIG.
F2 is formed, and both flange parts F, , F are provided with hump parts, , h, which protrude outward in order to lock a tire (not shown) fitted onto the wheel rim H. Furthermore, the ends of the flange portions F, F2 are bent inward.

When manufacturing this type of wheel rim H, conventionally,
For example, as disclosed in JP-A-56-131033, both ends of a cylindrical body made of a metal material such as an aluminum alloy are separately pressed and bent several times to form a flange portion FI+F2. Furthermore, both the flange parts F, , F are formed by roll forming.
, the hump portion F11+h2 was formed at the flange portion F1+F2, and the end portion of the flange portion F1+F2 was bent.

However, in the above manufacturing method, both ends of the cylindrical body are individually pressed several times, so
A large number of press processes are required, which is an impediment to improving the manufacturing efficiency of the wheel rim H. In addition, a large number of press devices must be used to perform these press processes, which makes it difficult to produce the wheel rim H. The entire manufacturing equipment is large and requires a large space.

(Problems to be Solved) An object of the present invention is to provide a method that can eliminate such inconveniences, reduce the number of steps, and efficiently manufacture a wheel rim.

Another object of the present invention is to provide an apparatus that can downsize the entire configuration of a wheel rim manufacturing apparatus.

(Means for Solving the Problems) In order to achieve the above object, the method for manufacturing a wheel rim of the present invention involves press working on both ends of a cylindrical body made of a metal material in order to form it into an automobile wheel rim. In a wheel rim manufacturing method comprising a press forming step of forming a flange portion of a predetermined shape, the press forming step includes forming the cylinder between an upper punch provided on an upper mold and a lower punch provided on a lower mold. A step of supporting the lower end surface of the cylindrical body with the axis of the body facing up and down, a step of fitting a side die onto the outer peripheral surface of the cylindrical body in the supported state, and then lowering the upper punch together with the upper die. and press forming the flange portion on the upper end of the cylindrical body between the upper punch and the side die, and then releasing the support on the lower end surface of the cylindrical body. Then, the upper punch is further lowered together with the side die and the cylindrical body, and the lower punch is fitted into the lower part of the cylindrical body, and the flange portion is pressed onto the lower end of the cylindrical body between the lower punch and the side die. It is characterized by consisting of a step of molding.

The method is characterized by comprising the press forming step of forming flange portions of a predetermined shape on both ends of the cylindrical body, and then the hump portion forming step of forming a hump portion on the flange portions by roll forming.

Alternatively, the press forming step may include forming a primary flange portion having a predetermined shape on both ends of the cylindrical body, and further forming the flange portion into a second flange portion having a secondary predetermined shape by press working. a press-forming step, and the second press-forming step includes an axis of the cylindrical body between an upper punch provided in a second upper mold and a lower punch provided in a second lower mold. A step of fitting the lower punch into the lower part of the cylindrical body in the vertical direction, a step of fitting a side die onto the outer peripheral surface of the cylindrical body in the fitted state, and then lowering the upper punch together with the upper die. and fit into the upper part of the cylindrical body, and between the upper punch and the side die, the second
a step of press-forming the flange portion of the cylindrical body, and then lowering the upper punch together with the side die to form the flange portion of the cylindrical body between the lower punch and the side die, which are fitted in the lower part of the cylindrical body. The method is characterized in that it consists of a step of press-forming the flange portion of No. 2.

Furthermore, the press forming step of forming the flange portions on both ends of the cylindrical body, the second press forming step of forming the flange portions into the second flange portions, and then the second press forming step of forming the flange portions on both ends of the cylindrical body. It is characterized by comprising a hump part forming step of forming a hump part on the flange part by press working.

Alternatively, the press forming step of forming the flange portions on both ends of the cylindrical body, the second press forming step of forming the flange portions into the second flange portions, and then the second press forming step of forming the flange portions on both ends of the cylindrical body; It is characterized by comprising a hump part forming step of forming a hump part on the flange part by roll forming.

Further, in order to achieve the above object, the wheel rim manufacturing apparatus of the present invention presses both ends of a cylindrical body made of a metal material into a predetermined shape in order to form the cylindrical body into a wheel rim of an automobile. In a wheel rim manufacturing device equipped with a press device for forming a flange portion, the press device removably supports the lower end surface of the cylindrical body whose axis is directed in the vertical direction, and the press device supports the lower end surface of the cylindrical body with its axis directed upward and downward. A previously energized support base, which is provided at a position above the support base so as to be movable up and down integrally with the support base, and is removably fitted onto the outer peripheral surface of the cylindrical body supported by the support base. A side die, a lower mold provided below the support base, an upper mold provided above the side die so as to be freely raised and lowered toward the lower mold, and a core provided on the upper mold. During the lowering of the upper mold, the upper die is fitted into the upper part of the cylindrical body to which the side die is fitted, and the cylindrical body is lowered together with the support base and the side die, and the upper end of the cylindrical body is pressed toward the side die. an upper punch for forming the flange portion on the upper end portion by using the upper punch; a detaching means for detaching the support base from the cylindrical body after the forming; The stand is detached and fitted into the lower part of the cylindrical body that has been lowered together with the upper punch and side die, and presses the lower end of the cylindrical body toward the side die to attach the flange to the lower end. It is characterized by comprising a lower punch for forming.

The side dies are disposed circumferentially around the cylindrical body and are movable toward the cylindrical body to a position where the side dies are fitted over the entire circumference of the cylindrical body, and the plurality of A moving means is provided for moving the die toward the cylindrical body supported by the support base.

Furthermore, the moving means is provided on the upper mold, and includes a cam that slides into contact with each of the dies during the lowering of the upper mold to move each of the dies toward the cylindrical body.

Further, the support table is characterized by comprising a plurality of movable tables disposed in the circumferential direction at positions supporting the lower end surface of the cylindrical body and movable in a direction away from the lower end surface of the cylindrical body. .

Furthermore, the detachment means is provided on the lower mold, and when the support base is lowered together with the side die, it engages with a cam hole formed in each of the movable bases and moves each movable base from the cylindrical body. It is characterized by comprising a cam that moves in a direction away from the lower end surface of the cam.

The side die and the support stand penetrate the lower mold and protrude toward the upper mold, and are movable upwardly and engaged with the tip of the biased cushion pin. It is characterized by being installed on a platform that can be raised and lowered in one piece.

Further, the upper punch and the lower punch are formed in a shape such that when the upper punch and the lower punch are fitted into the cylindrical body, their tip surfaces abut each other at substantially the center of the cylindrical body.

(Function) According to the wheel rim manufacturing method of the present invention, the flange portion is sequentially formed at the upper end portion and the lower end portion of the cylindrical body through two press forming steps performed by lowering the upper mold once. .

When the hump portion forming step is performed after the press forming step, the hump portions are formed on both flange portions by roll forming.

Further, by performing the second press forming step after the press forming step, it is also possible to perform press working twice on both ends of the cylindrical body as necessary to form a flange portion.

At this time, the second press molding process is performed by lowering the second upper mold once, similarly to the press molding process.

Further, when the hump portion forming step is performed after the second press forming step, the hump portions are formed on both flange portions by roll forming or press forming.

Next, according to the wheel rim manufacturing apparatus of the present invention, when forming the flanges at both ends of the cylindrical body, first one surface of the lower end of the cylindrical body is supported on the support stand of the press device. In this state, the side die is fitted onto the outer peripheral surface of the cylindrical body, and the upper mold is lowered. and,
During the lowering of the upper die, first, the upper punch is fitted into the upper part of the cylindrical body and descends together with the cylindrical body, the side die, and the support base. At this time, since the side die and the support stand are urged upward, the upper end of the cylindrical body is pressed between the side die and the upper punch, thereby forming the flange portion on the upper end. . Next, the upper punch, the cylindrical body, the side die, and the support stand are further lowered together with the upper mold, and during the descent, the support stand is detached from the lower end surface of the cylindrical body by the detachment means, and then the lower part of the cylindrical body is removed. The lower punch provided in the lower mold is fitted into the lower die, and the lower end of the cylindrical body is pressed between the side die and the lower punch, thereby forming the flange portion on the lower end, and at the same time, the upper The lowering of the mold is completed.

Therefore, by lowering the upper mold once, the flange portions are sequentially formed at the upper end and lower end of the cylindrical body.

When the side die is composed of the plurality of dies and the moving means for moving the plurality of dies is provided, when the side die is externally fitted on the outer peripheral surface of the cylindrical body, the plurality of dies are By moving the dies toward the cylindrical body by the moving means, the plurality of dies are fitted around the entire circumference of the cylindrical body.

Furthermore, when the moving means is provided on the upper mold and includes the cam, the cam slides into contact with the outer surface of each die during the descent of the upper mold, and moves each die toward the cylindrical body. As a result, each die is fitted onto the outer peripheral surface of the cylindrical body. Therefore, the side die is fitted onto the outer peripheral surface of the cylindrical body by the lowering movement of the upper die.

Further, when the support base is composed of the plurality of movable bases, when the support base is detached from the cylindrical body, the detachment means moves each movable base in a direction in which the movable base is separated from the lower end surface of the cylindrical body. By moving each movable table, and therefore the support table, from the cylindrical body, the lower punch can be fitted into the lower part of the cylindrical body in this state.

Furthermore, when the detachment means is provided on the lower mold and includes the cam, when the upper punch, the cylindrical body, the side die, and the support are lowered together with the upper mold, the cam is attached to the support The various moving tables are engaged with the cam holes formed in each of the moving tables to move the various moving tables in a direction away from the cylindrical body, thereby detaching the support table from the cylindrical body. Therefore, the support base is detached from the cylindrical body by the lowering movement of the upper die.

Further, when the side die and the support stand are provided on the elevating table that is engaged with the tip of the cushion bin, the side die and the support stand can be freely raised and lowered by the cushion bin via the elevating table. is biased upward.

Further, when the upper punch and the lower punch are fitted into the cylindrical body and are formed in such a shape that their tip surfaces abut each other at approximately the center of the cylindrical body, the cylindrical body When the flange is formed at the lower end, the tip surfaces of the upper punch and the lower punch contact each other, so the cylindrical body is not pressed more than necessary between the punches and the side die.

(Example) An example of the method for manufacturing a wheel rim of the present invention will be outlined with reference to FIGS. 1 and 2 (a) to (d). Figure 2 (
a) to (d) are explanatory cross-sectional views for explaining the outline of the manufacturing method of the wheel rim H shown in the first figure.

In this manufacturing method, first, second cylindrical bodies are attached to both ends of the cylindrical body A shown in FIG.
As shown in Figure (b), the flange portion F of the wheel rim H
+, a spare flange part Fa having a roughly similar shape to F z
,, Fax is molded, and then the preliminary flange part Fa
,, Fa, are formed into flange parts Fbl and Fb2 having substantially the same shape as the flange part F I + F t except for the hump parts, , h, as shown in FIG. 2(C), and then As shown in FIG. 2(d), the flange portion Fbt
, Fb2 are formed with hump portions b+, hz, respectively, and the end portions of the flange portions Fb, , Fb are bent inward to obtain a wheel rim H. Each of the above-mentioned moldings is performed by press working, which will be described later.

The method of forming the preliminary flange portions Fa, Fa2 and the press equipment Hx for forming the same are shown in Figs. 3 to 6 (
This will be explained according to a) and (b). FIG. 3 is an explanatory sectional view of the press device X, FIG. 4 is a sectional view taken along the line ■-■ in FIG. 3,
Figure 5 is a sectional view taken along line V-V in Figure 4, Figure 6 (a), (
b) is an operation explanatory diagram for explaining the operation of this press device X.

In FIGS. 3 and 4, 1 is an upper mold that is equipped with an upper punch 2 on the lower surface and can be raised and lowered together with the upper punch 2, and 3 is a lower mold that is located directly below the upper punch 2 and has a lower punch 4 on the upper surface. A mold, 5 is a horizontal lifting platform provided between the molds 1 and 3 so as to be freely raised and lowered, and 6 is a horizontal lifting platform provided integrally with the lifting platform 5 so as to be able to be raised and lowered, and includes both punches 2.
．． A support stand that is concentric with 4 and removably supports the lower surface of the cylindrical body A whose axis is directed in the vertical direction; 8 is a detaching means for detaching the support base 6 supporting the cylindrical body A from the cylindrical body A; 9 is the outer peripheral surface of the cylindrical body A supported on the support base 6; This is a moving means for moving the side dia in order to fit the side dia on the outside of the dia.

Both punches 2.4 each have molding surfaces 2a, 4a on their outer peripheral surfaces for molding the inner peripheral surfaces of the preliminary flange parts Fa, Fa2, as shown in FIG. When the punch 2 is lowered toward the lower punch 4, it is fitted into the upper and lower parts of the cylindrical body concentrically and vertically oriented between the two punches 2 and 4, and the upper die 1
The cylindrical body A is formed so that its tip surfaces abut each other at approximately the center position of the cylindrical body A upon completion of its descent.

The lifting table 5 is supported by the upper end of a cushion pin 1O that extends from below the lower mold 3 and protrudes toward the upper mold 1 in a vertically movable manner, as shown in the third figure. The outer surface is in sliding contact with the inner surface of a backup member 11 erected on the side of the lower mold 3, and is movable up and down along the inner surface. The cushion plate 10 is mounted on a cushion plate 12 which is movable up and down below the lower die 3 and is urged upward by a spring or the like (not shown), and urges the elevator platform 5 upward. ing. Further, at a position between the punches 2 and 4 of the lifting table 5, there is a circular opening 5a having a diameter through which the lower punch 4 can freely pass through when the lifting table 5 is lowered.
is provided, and as shown in FIGS. 4 and 5, the opening 5a
A plurality of grooves 5b extending radially from the top surface of the lifting platform 5 are formed.

The support table 6 is a lifting table 5 as shown in FIGS. 4 and 5.
A plurality of movable platforms 1 are engaged with each of the movable platforms 1 so as to be horizontally movable along the grooves 5b and to be movable up and down integrally with the elevating platform 5.
As shown in FIG. 5, each movable table 13 is connected to the lifting table 5 via a spring 14 and urged toward the center of the opening 5a. As a result of this urging, the tip of each movable table 13 protrudes into the opening 5a as shown in FIG. A ring-shaped support portion 6a is formed along the end surface, and the cylindrical body Δ is connected to the support portion 6a.
A is supported concentrically with both punches 2.4 as shown in the third figure. Furthermore, a cam hole 13a extending diagonally in the vertical direction is provided at the rear of each movable table 13, as shown in FIG.

As shown in the third figure, the detachment means 8 includes an arm 15 that is erected on the lower die 3 at a position below the cam hole 13a of each movable metalwork 3 of the support base 6, and the support base 6 is attached to the arm 15. Lifting platform 5
cam hole 1 as shown in the imaginary line in Figure 5.
A cam 15a is formed to be engaged with the cam 3a. The cam 15a and the cam hole 13a are arranged so that as the support base 6 descends, the tip of each movable base 13 is detached from the cylindrical body A supported by the support part 6a, and the lower punch 4 is moved to the elevating base. 5 is formed so as to be moved in the radial direction along the groove 5b to a position where the opening 5a of the groove 5 can be penetrated.

As shown in FIGS. 3 and 4, the side dia consists of a plurality of dies 16 arranged in the circumferential direction so as to surround the outer peripheral surface of the cylindrical body supported by the support base 6, and each die 16 are mounted on the lifting table 5 at a distance from each other, and are horizontally movable on the lifting table 5 in a radial direction with respect to the cylindrical body A. The outer surface of each die 16 is connected to a backup member 17 erected on the side of the lifting platform 5 as shown in the third figure via a spring 18 as shown in the fourth figure, and separated from the cylindrical body A. is biased in the direction of

Further, each die 16 has the preliminary flange portions Fa at the upper and lower portions of its inner surface, respectively, as shown in the fifth figure.

Molding surface 16a for molding the outer peripheral surface of the fax machine in parts
,.

16a to z, and when each die 16 is moved toward the cylindrical body A supported on the support base 6, the dies 16 abut each other and together, the side dies form the outer periphery of the cylindrical body A. The molded surfaces 16a1, 16az are fitted over the entire circumference of the molded surface, and these molded surfaces 16a1, 16az form a mutually continuous surface.

The moving means 9 includes a backup member 17 of the lifting platform 5 and a guide member 19 vertically installed on the lower surface of the upper mold 1 at a position above the gap between each die 16, as shown in the third figure. A cam 19a is formed on the cam 19a to be engaged with a cam surface 16b formed on the outer surface of each die 16 when the upper die 1 is lowered. Then, the cam 19a and the cam surface 16b
For example, as the upper mold 1 descends, each die 16 is moved toward the cylindrical body as described above, and the backup member 1 is
A guide member 19 is inserted into the gap between the cylindrical body A and each of the dies 16, so that the side dies are fitted onto the outer peripheral surface of the cylindrical body A.

In FIG. 3, reference numeral 20 denotes a guide post erected on the side of the lower mold 3, and when the upper mold 1 is lowered, the guide bush 21 vertically installed on the side of the upper mold 1 is attached to the guide post. It is guided by the post 20 and lowered.

Next, the operation of the press device X is shown in FIGS. 3 and 6 (
This will be explained according to a) and (b).

In this press device Descend toward A.

During this downward movement, first, the cam 19a of the guide member 19 is moved to the cam surface 16b of each die 16 of the side die.
, and each die 16 is moved toward the cylindrical body A as described above, and the guide member 19 is moved to the position of the backup member 17 of the lifting table 5 and the gap between each die 16 as shown in FIG. As shown in (a), each die 16 is pressed against the outer circumferential surface of the cylindrical body A, and the side dies are fitted onto the outer circumferential surface of the cylindrical body 1 over the entire circumference.

On the other hand, almost simultaneously with the external fitting of the side diamond, the upper punch 2 is fitted into the upper part of the cylindrical body 1 as shown in FIG. 6(a), and presses the upper part of the cylindrical body A toward the side diamond. As a result, the preliminary flange portion Fa is formed between the forming surface 2a of the upper punch 2 and the continuous forming surface 16a of the side die.
, is formed. At this time, the side diamond and the support stand 6 are urged upward by the cushion bin 0 via the lifting table 5, and this urging force is caused by the upper punch 2 pressing the upper part of the cylindrical body A as described above. The size is set to such an extent that it can be pressed toward the side diamond, and is set to a size that does not prevent the upper mold l from descending.

As the upper die 1 is further lowered after the above-described forming, the upper punch 1 is lowered together with the cylindrical body A, the side diamond, the support table 6 and the lifting table 5, and on the way, first, the detachment means 8
As described above, the cam 15a of each movable base 13 of the support base 6
As the moving table 13 is engaged with the cam hole 13a of the cylindrical body A, as shown in FIG. is released, and subsequently, the lower punch 4 is fitted into the lower part of the cylindrical body A as shown in FIG. 6(b). At this time, the upper punch 2 fitted inside the upper part of the cylindrical body A presses the lower part of the cylindrical body A toward the lower punch 4 through the side diamond, thereby pressing the forming surface 4a of the lower punch 4 and the side The preliminary flange portion Fag is formed between the continuous forming surfaces 16az of the diamond. During this molding, as shown in FIG. 6(B), the tip surfaces of both punches 2.4 come into contact with each other at approximately the center of the cylindrical body A, and the cylindrical body A Don't be pressured more than necessary between the two.

Simultaneously with the completion of such molding, the lowering of the upper mold 1 is stopped, and then the supranuclear mold 1 is raised to its original position.

As a result of this rise, the lower punch 4, upper punch 2, and side diamond are sequentially moved to the spare flange F by the operation opposite to the above.
a,, while being detached from the cylindrical body A in which the Fax was formed,
The cylindrical body A is supported on the support stand 6, and the cylindrical body A is carried out from the press device X in this state.

Next, the preliminary flange portion Fa1. A method of forming Fa2 into the flange portions Fb, Fb2 and a press apparatus Y for performing the forming will be explained with reference to FIGS. 7 and 8(a) and (b). FIG. 7 is an explanatory cross-sectional view of this press device Y, and FIGS. 8(a) and (b) are explanatory views of the operation of its main parts.

This press device Y has the same basic configuration as the press device X, and as shown in FIG. a side dial consisting of a lifting table 5 which is provided in a manner that it can be freely raised between the two and is biased upwardly by a cushion bin 10, and a plurality of dies 16 which are mounted on the lifting table 5 so as to be horizontally movable; , cylindrical body A equipped with preliminary flange parts Fa, , Fag
In order to fit the side dia on the outer peripheral surface of each die 16
These press apparatuses have the same structure as the press apparatus X. This press device Y is not equipped with the support stand 6 and the detachment means 8, and the cylindrical body A equipped with the preliminary flange parts Fa, , Fag is concentric with both punches 2 and 4 and is located at the lower part thereof, as shown in FIG. A lower punch 4 is directly fitted into the cylindrical body A, thereby supporting the cylindrical body A, and in this state, the upper mold 1 is lowered to perform press working.

Both punches 2.4 each have a forming surface 2 on its outer circumferential surface for forming the inner circumferential surfaces of the flange portions Fb, Fb2.
b, 4b, and the upper and lower inner surfaces of each die 16 of the side dia are provided with the flange portions Fb+ and Fb2, respectively.
Molding surfaces 16bl, 16bz for molding the outer peripheral surface of
is formed.

In such a press apparatus Y, when the upper die 1 is lowered, each die 16 of the side dies is first moved by the moving means 9 similarly to the press apparatus X, and the side dies are placed in reserve as shown in FIG. Flange part Fa, Fa.

The upper punch 2 is fitted over the entire circumference of the outer circumferential surface of the cylindrical body A having The flange portion Fb is formed between the surface 2b and the forming surface 16b+ of the side dia, and then the upper punch 2 and the side dia are slightly lowered by further lowering of the upper mold 1, as shown in FIG. 8(b). The preliminary flange part Fag of the cylindrical body A is formed on the forming surface 4b of the lower punch 4 and the forming surface 16b of the side diamond.
The flange portion Fbz is formed between the two portions.

More specifically, when forming the flange portions Fbt and Fbz, both ends of the cylindrical body A provided with the preliminary flange portions Fa, Fa are pressed against the upper punch 2 as shown in FIG. 8(a). At the time of internal fitting, the jaws 2x and 4x formed at the upper end of the forming surface 2b of the upper punch 2 and the lower end of the forming surface 4b of the lower punch 4, respectively, are engaged with the jaws 2x and 4x, and the preliminary flange Fa ,, A portion parallel to the axis of the cylindrical body A of the Fax is sandwiched between the upper punch 2 and the side diamond and between the lower punch 4 and the side diamond, respectively. As the upper punch 2 is lowered in this state, first, the portion of the preliminary flange portion Fa parallel to the axis of the cylindrical body A is pressed downward in the axial direction, and the Spare flange part F
The part inclined with respect to the axis of the cylindrical body A of cylindrical body A is pressed toward the side die between the upper punch 2 and the side die, thereby causing the preliminary flange part Fa to open as shown in FIG. 8(b). , is the flange portion Fb.

is formed into. Next, the upper punch 2 is further lowered and the preliminary flange portion Fa2 is moved to the flange portion Fb in the same manner as above.
Shaped into z.

In this way, when forming the flange portions Fb, Fb, the cylindrical body A provided with the preliminary flange portions Fat, Fa2 is locked between both punches 2, 4, and the preliminary flange portions Fa, . Since the part of Fa2 parallel to the axis of the cylindrical body is sandwiched between both punches 2.4 and pressurized in this state, the preliminary flange part Fa+.

Almost no load, such as a tensile load, acts on the Fag, and therefore, harmful effects such as cracks that often occur due to the tensile load, etc. in this type of press molding are prevented.

Incidentally, in the above-mentioned press forming, similarly to the above-mentioned press device It is designed so that it will not be pressurized.

Next, a method of forming the hump portions, . FIG. 9(a), 0)) is an explanatory diagram of the operation of the main parts of this press device Z.

The press group Hz has the same configuration as the press device Y,
As shown in FIG. 9(a), the upper molding surface 16c1 of the side diamond for molding the outer peripheral surface of the flange portion F1 of the wheel rim H has a position corresponding to the hump portion h1 and a position corresponding to the flange portion F1. Recesses 16x, , 2 are formed in the circumferential direction at positions corresponding to the ends of , respectively, and the hump portion is formed on the lower molding surface 16c2 of the side diamond for molding the outer peripheral surface of the flange portion F2. Recesses 16y+ and 16yz are formed in the circumferential direction at a position corresponding to h2 and a position corresponding to the end of flange portion F2, respectively.

Further, the outer peripheral surfaces of both punches 2.4 have molding surfaces 2c and 4c for molding the inner peripheral surface of the flange portion Fl+F2, respectively, similarly to the press device Y, and the upper part 1 of the molding surface 2c
and the lower end of the molding surface 4C have jaws 2x and 4x, respectively.
is formed.

In this press device Z, similarly to the press device Y, the cylindrical body A is inserted into the gap in which the upper punch 2 is fitted into the upper part of the cylindrical body provided with the flange portions Fb, Fb2, as shown in FIG. 9(a). )
As shown, the jaws 2χ of the upper punch 2 and the jaws 4x of the lower punch 4 are locked, and the flange parts Fb, , F
Parts b2 parallel to the axis of the cylindrical body A are sandwiched between the upper punch 2 and the side diamonds and between the lower punch 4 and the side diamonds, respectively. As the upper punch 2 is lowered in this state, a portion of the flange portion Fb parallel to the axis of the cylindrical body A is pressed in the axial direction, and thereby the position of the recess 16X1.16X2 is pressed. As shown in FIG. 9(b), the flange portion Fb protrudes into the recess 16x1.16xz, the end of the flange Fb is bent, and a hump h1 is formed at the position of the recess 16x1. , a flange portion Fb+ is formed on the flange portion F. Next, the upper punch 2 is further lowered, and in the same way as above, the flange portion Fb2 protrudes into the recesses 16y+, 16yz at the positions of the recesses 16y+, 16yz, as shown in FIG. , and a hump portion h2 is formed at the position of the recessed portion 16y,
A flange portion Fb2 is formed on the flange portion F2, thereby obtaining the wheel rim H.

In this way, in the press device Z, the recesses 16x+ and 16 are formed on the forming surfaces 16cl and 16cz of the side dia, respectively.
By forming y+, the hump portions, h, are formed by press working, and the forming surfaces 16c, 16
By forming concave portions 16X2 and 16y2 in cz, the ends of the flange portions F, F2 are bent.

As mentioned above, in this embodiment, the press device X,
Using Y and Z, a flange portion of a predetermined shape is sequentially formed on the upper end and lower end of the cylindrical body by one operation of each, and the cylindrical body A is pressed into the wheel rim H by a total of three press processes. is formed into.

Next, the flange portion Fb is formed by roll forming.

A method of forming the hump portions h+, hz on Fb2 and bending the ends of the flange portions Fb, Fb2 will be described with reference to FIG. FIG. 10 is an explanatory diagram for explaining this roll forming.

In this roll forming, as shown in FIG.
Four roll dies 23a are integrally and rotatably fitted into the
-23d forming roller 24, and four roll dies 26a-26 integrally and rotatably fitted on the rotating shaft 25.
A forming roller 27 with d is used, and forming roller 2
The roll dies 23a to 23d of No. 4 and the roll dies 26a to 26d of the forming roller 27 are respectively formed at the end of the flange portion Fb+ of the cylindrical body A, the portion forming the hump portion, the portion forming the hump portion h2, and the flange portion. Rotating shaft 22.2 at the same distance as the axial distance of the end of Fbz to the cylindrical body.
It is located at 5.

When forming, the forming roller 24 is inserted into the cylindrical body A in the axial direction as shown in FIG. , located on the side of the part forming the hump part h2 and the end of the flange part Fbt,
On the other hand, the forming roller 27 is positioned on the outside of the cylindrical body so that each of its roll dies 26a to 26d faces the roll dies 23a to 23d of the forming roller 24, respectively.

Next, the reshaping rollers 24, 27 are rotated around their axes and moved toward each other, so that the respective roll dies 23a to 23d and 26a to 26d are pressed into contact with each other through the side wall of the cylindrical body A. , and is further rolled in the circumferential direction onto the cylindrical body while maintaining the pressed state. At this time, the hump portions hr and ht are respectively connected to the roll die 23b.
, 26b and between the roll dies 23c, 26c, and the flange portion Fb.

The end portions of Fbz are bent between the roll dies 23a and 26a and between the roll dies 23d and 26d, respectively, so that the flange portions Fb, , Fbz are bent between the flange portions F It
The wheel rim H is obtained by molding F2.

In this way, the flange portion Fb is attached to the cylindrical body A.

After molding Fbz, the wheel rim H can also be obtained by roll molding.

In the embodiment described above, the flange portions Fb, Fb2 were formed at both ends of the cylindrical body by two press processes, but the shape of the flange portions Fb+, Fb2, and therefore the shape of the flange portion of the wheel rim. Depending on the case, it may be possible to manufacture a wheel rim by forming a flange part having almost the same shape as the flange part through two press processes, and then forming a hump part on the flange part by roll forming or the like. Of course.

(Effects) As is clear from the above description, according to the wheel rim manufacturing method of the present invention, the flange portion is formed on the upper end of the cylindrical body between the upper punch and the side die when the upper die is lowered, and then these are integrally formed. By further lowering the lower die and forming a flange part at the lower end of the cylinder between the lower punch and the side die, the flange part is sequentially formed at the upper and lower ends of the cylinder by descending the press - times. This makes it possible to reduce the number of wheel rim manufacturing processes and improve manufacturing efficiency.

Then, by forming the hump part by roll forming after forming the flange part, the wheel rim can be efficiently manufactured.

Furthermore, by performing the forming of the flange part in two press processes similar to those described above, the flange part can be more reliably formed into a predetermined shape. It is possible to efficiently manufacture wheel rims by molding the parts.

According to the wheel rim manufacturing apparatus of the present invention, a nide die and a support stand are provided between an upper punch and a lower punch so as to be biased upwardly between an upper punch and a lower punch so as to be movable up and down. By providing a detachment means for detaching the support base from the cylindrical body before the lower punch is fitted into the supported cylindrical body, the cylindrical body can be removed by one lowering of the upper mold according to the above manufacturing method. The flange portions can be sequentially formed on the upper and lower end portions of the wheel rim, and the number of press devices for forming the flange portions can be reduced, thereby making it possible to downsize the entire wheel rim manufacturing apparatus.

When the side die is composed of a plurality of dies and a moving means for moving each die is provided, the side die can be fitted onto and removed from the outer peripheral surface of the cylindrical body with a relatively easy configuration, and further, the moving means When the upper mold is provided with a cam to move each die, each die can be moved efficiently by lowering the upper mold, and the side die can be externally fitted onto the cylindrical body, and the configuration of the press device can be further simplified. can do.

Furthermore, when the support base is composed of a plurality of movable bases, the support base can be easily detached from the cylindrical body by a detaching means. When the cams to be moved are formed, the lowering of the upper die allows each movable stage to be efficiently removed from the cylindrical body, and the configuration of the press apparatus can be further simplified.

In addition, when the side die and the support stand are provided on a lift table and the lift table is engaged with a cushion bin and urged upward, the above-mentioned press machine can be easily operated using a press machine equipped with the cushion bin. Can be configured.

In addition, when the upper punch and the lower punch are shaped like sticks that are fitted inside the cylindrical body and have their tip surfaces in contact with each other, it is possible that the upper and lower ends of the cylindrical body will be exposed more than necessary during the above pressing process. The flange portion is not pressed, and therefore the flange portion can be reliably formed into a predetermined shape.

[Brief explanation of the drawing]

Figure 1 is an explanatory sectional view of an example of a wheel rim, Figure 2 (
a) to (d) are explanatory diagrams for explaining the outline of an example of the method for manufacturing a wheel rim of the present invention, FIG. 3 is an explanatory cross-sectional view of an example of a press device, and FIG. A sectional view taken along the line V-IV, FIG. 5 is a sectional view taken along the line V-V of FIG. 4, and FIG. 6(a).
, (b) is an explanatory diagram of the operation of the press device shown in FIG. 3, FIG. 7 is an explanatory sectional view of an example of the press device, and FIG. 8 (a),
(b) is an explanatory diagram of the operation of the press device in Fig. 7, and Fig. 9 (a)
), (b) is an explanatory diagram of the operation of the main parts of an example of a press device,
FIG. 10 is an explanatory diagram for explaining a method of forming a hump portion by roll forming. 1... Upper die 2... Upper punch 3...
Lower die 4...Lower punch 5...Elevating platform
6...Support stand 7...Side die
8... Detachment means 9... Transfer means 10...
・Cushion bin 13...Movement stand 13a
...Cam hole 15a...Cam of detachment means 16...
Gui 19a... Cam of moving means A... Cylindrical body Fa
t, Fa,, Fb,, Fbz, F++
F+...flange part

Claims (1)

[Claims] 1. A wheel rim equipped with a press-forming process for forming flange portions of a predetermined shape on both ends of a cylindrical body made of a metal material by press working in order to form the cylindrical body into an automobile wheel rim. In the manufacturing method, the press forming step is performed by directing the axis of the cylindrical body in the vertical direction between an upper punch provided in the upper die and a lower punch provided in the lower die, so that the lower end surface of the cylindrical body is a step of supporting the side die on the outer peripheral surface of the cylindrical body in the supported state, a step of lowering the upper punch together with the upper mold to fit the side die into the upper part of the cylindrical body, and a step of fitting the side die onto the outer peripheral surface of the cylindrical body in the supported state; a step of press-forming the flange portion on the upper end of the cylindrical body between the side die and the cylindrical body, and then releasing support on the lower end surface of the cylindrical body and further lowering the upper punch together with the side die and the cylindrical body; A method for producing a wheel rim, comprising the steps of: inserting a lower punch into the lower part of the cylindrical body; and press-forming the flange portion at the lower end of the cylindrical body between the lower punch and a side die. . 2. A claim characterized in that the method comprises the press forming step of forming flange portions of a predetermined shape on both ends of the cylindrical body, and then the hump portion forming step of forming a hump portion on the flange portions by roll forming. 1. The method for manufacturing a wheel rim according to 1. 3. The press forming step of forming a primary flange portion of a predetermined shape on both ends of the cylindrical body, and a second step of forming the flange portion into a second flange portion of a secondary predetermined shape by press working. The second press forming step includes an upper punch provided on the second upper die and a second press forming step.
a step of internally fitting the lower punch into the lower part of the cylindrical body with the axis of the cylindrical body facing up and down between the lower punch provided in the lower mold; a step of externally fitting a side die onto the outer circumferential surface, and then lowering the upper punch together with the upper mold to internally fit the side die into the upper part of the cylindrical body, and inserting the side die into the upper end of the cylindrical body between the upper punch and the side die; 2, and then the upper punch is further lowered together with the side die to form the lower end of the cylindrical body between the lower punch and the side die fitted in the lower part of the cylindrical body. 2. The method of manufacturing a wheel rim according to claim 1, further comprising the step of press-forming the second flange portion. 4. the press forming step of forming the flange portions on both ends of the cylindrical body; then the second press forming step of forming the flange portions into the second flange portion; 4. The method of manufacturing a wheel rim according to claim 3, further comprising a step of forming a hump part on the flange part by press working. 5. the press forming step of forming the flange portions on both ends of the cylindrical body; then the second press forming step of forming the flange portions into the second flange portion; 4. The method of manufacturing a wheel rim according to claim 3, further comprising a step of forming a hump part on the flange part by roll forming. 6. A wheel rim manufacturing apparatus equipped with a press machine that presses both ends of a cylindrical body made of a metal material to form a flange portion of a predetermined shape in order to form the cylindrical body into an automobile wheel rim. A press device is connected to a support base which detachably supports the lower end surface of the cylindrical body with its axis facing in the vertical direction and is biased upward so as to be able to rise and fall, and a press device is attached to a position above the support base. a side die that is movable up and down integrally with the support base and removably fitted onto the outer peripheral surface of the cylindrical body supported by the support base; a lower die provided at a position below the support base; An upper mold is provided above the side die so as to be able to rise and fall and is lowered toward the lower mold. an upper punch that is fitted into the cylindrical body and lowered together with the support stand and the side die, and presses the upper end of the cylindrical body toward the side die to form the flange portion on the upper end; a detaching means for detaching the support stand from the cylindrical body; and a cylindrical body provided on the lower mold, from which the support stand is detached and lowered together with the upper punch and the side die when the upper die is lowered. and a lower punch that is fitted into the lower part of the cylindrical body and presses the lower end of the cylindrical body toward the side die to form the flange portion on the lower end. 7. The side die comprises a plurality of dies disposed circumferentially around the cylindrical body and is movable toward the cylindrical body to a position where the side die is fitted over the entire circumference of the outer peripheral surface of the cylindrical body; 7. The wheel rim manufacturing apparatus according to claim 6, further comprising a moving means for moving the die toward the cylindrical body supported by the support base. 8. Claim 7, wherein the moving means is provided on the upper mold, and includes a cam that slides into contact with each of the dies during the lowering of the upper mold to move each of the dies toward the cylindrical body. The described wheel rim manufacturing equipment. 9. The support table is characterized by comprising a plurality of movable tables disposed in the circumferential direction at positions supporting the lower end surface of the cylindrical body and movable in a direction away from the lower end surface of the cylindrical body. The wheel rim manufacturing apparatus according to claim 6. 10. The detachment means is provided on the lower mold, and when the support base is lowered together with the side die, it engages with a cam hole formed in each of the movable bases to move each movable base to the cylindrical body. 10. The wheel rim manufacturing apparatus according to claim 9, further comprising a cam that moves the cam in a direction away from the lower end surface of the wheel rim. 11. The side die and the support stand penetrate the lower mold and protrude toward the upper mold, and are engaged with the tip of a cushion pin that is biased upward so as to be movable up and down. 7. The wheel rim manufacturing apparatus according to claim 6, wherein the wheel rim manufacturing apparatus is provided on a lifting platform that can be raised and lowered integrally. 12. Claim 6, wherein the upper punch and the lower punch are formed in a shape such that when the upper punch and the lower punch are fitted into the cylindrical body, their tip surfaces abut each other at approximately the center of the cylindrical body. The described wheel rim manufacturing equipment.