JPH035035A - Apparatus for forming hump part of wheel rim - Google Patents

Abstract

PURPOSE:To efficiently form the wheel rim by forming the hump part of the wheel rim with the press working and bending the end part of this wheel rim so as to project toward the outside with this press working. CONSTITUTION:A lower punch 2 is set at a lower die 1 and contained at the inside of the lower part of the cylindrical body C. A upper punch 4 is set at the upper die 3 which is vertically movable and to be lowered to the lower die and is to be inserted at the upper part of the cylindrical body with the lower punch inserted at its lowering time. The side die 5 is set at the around position of the cylindrical body and the lower die is divided movably to the position of the outside periphery surface towared the cylinrical body. The moving means to move the side die and enclose the outer peripheral surface of the cylindrical body. When the above upper die is lowered is provided. Projecting parts to form the hump part h1 are set in the circumferencial state at the outside peripheral surface of the respective punches and the recessing parts to form the respective hump parts are inserted in the circumferencial state at the inside peripheral surface of the side die, and in these state the punch is moved to the side die and then the efficient forming of the hump parts is executed.

Description

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

(Prior Art) As a wheel rim for an automobile, for example, one having the shape shown in FIG.
A hump portion h+ is provided at a predetermined portion of the side wall of each of the flange portions FI and F2, and is curved to protrude outward in order to lock a tire (not shown) fitted onto the wheel rim H. , hz are provided, and the ends of the flange portions F, , F2 are also curved so as to protrude outward.

When manufacturing this type of wheel rim H, conventionally,
For example, as disclosed in Japanese Unexamined Patent Publication No. 56-131033, both ends of a cylindrical body made of a metal material such as an aluminum alloy are fitted with a punch fitted inside the ends in the axial direction, and The two end portions are formed into the shape of the flange portions F, F2 by press working between them and a side die that is fitted onto the outer circumferential surface of the body to expand the tube.

When forming the hump parts h+, hz of the wheel rim H, since the hump parts h+, hz are curved so as to protrude outward, the hump parts h+, h, Since it is not possible to punch out the mold even if one tries to mold it, conventionally,
As disclosed in Publication No. 3, in the above press working, the flange portion FI+F2 is
A cylindrical body having approximately the same shape as the wheel rim is formed by molding it to have approximately the same shape as that of the wheel rim H except for 11+fi2, and then a predetermined portion of the side wall of the cylindrical body is rolled to the outside. At the same time, both ends of the cylindrical body were curved outward to form a wheel rim.

However, this type of roll forming takes more time than pressing, and this has been an obstacle to improving the manufacturing efficiency of the wheel rim H.

(Problems to be Solved) The present invention eliminates such inconveniences, allows the hump portion of the wheel rim to be efficiently formed by press working, and furthermore allows the end portion of the wheel rim to protrude outward through the press working. The object of the present invention is to provide a device that can also be curved to do so.

(Means for Solving the Problems) In order to achieve the above object, the wheel rim hump forming apparatus of the present invention is provided at both ends of a cylindrical body that is formed into substantially the same shape as a wheel rim for manufacturing an automobile wheel rim. A device for molding hump parts curved so as to protrude outwardly on the side walls of the parts, which are provided in a lower mold and fitted into the lower part of the cylindrical body whose axis is directed in the vertical direction. A lower punch, an upper punch that is installed in the upper die that is movable up and down and that descends toward the lower die, and that is fitted into the upper part of the cylinder into which the lower punch is fitted when the upper die is lowered, and the lower punch is fitted into the upper die. a side die that is provided on the lower mold at a position around the cylindrical body and is divided so as to be movable toward the cylindrical body to a position where it is fitted onto the outer peripheral surface of the cylindrical body; a moving means for moving and fitting onto the outer circumferential surface of the cylindrical body, a convex portion forming the hump portion is provided circumferentially on the forming surface formed on the outer circumferential surface of each of the punches; A concave portion forming each hump portion is circumferentially provided in a molding surface formed on an inner circumferential surface, and with both punches being fitted inside the cylinder, the punches are inserted into the side dies fitted externally to the cylinder. The cylindrical body is divided movably in a direction substantially orthogonal to the axis of the cylindrical body, and when the cylindrical body is fitted into the body, both punches are moved toward the side die to punch a predetermined portion of the side wall at both ends of the cylindrical body. A pressurizing means is provided between the convex part and the concave part of the side die to press toward the concave part and curve the predetermined part into the concave part to form the hump part.

The upper punch is biased downwardly with respect to the upper die so as to be able to rise and fall freely, and the pressurizing means passes through a cam hole formed in the center of the upper punch and the upper core die. A center cam is integrally provided with the center cam and is provided at the base of the center cam and protrudes downward so as to be freely raised and lowered.The upper punch is slidably engaged with the cam hole of the upper punch. an upper cam that moves the upper punch toward the side die by lowering the center cam when the center cam is fitted into the body; and an upper cam provided at the tip of the center cam and at the center of the lower punch when the upper die is lowered. and a lower cam that slidably engages in a cam hole formed in the center cam and moves the lower punch toward the side die by lowering the center cam.

Further, at the same time as forming the hump portion, a second convex portion and a second concave portion are formed on each punch and curve the end portion of the cylinder so as to protrude outward between the respective punches and the side die. and the molding surface of the side die.

Further, the moving means is provided on the upper mold, and includes a drive cam that slides into contact with the outer surface of the side die during the lowering of the upper mold to move the side die toward the cylindrical body.

(Function) According to this means, first, the lower punch is fitted into the lower part of the cylindrical body with its axis directed in the vertical direction, and in this state, the upper die is lowered toward the lower die, and the upper die is lowered toward the lower die. The side die is moved toward the cylindrical body by the moving means and is fitted onto the outer peripheral surface of the cylindrical body. As the upper mold descends, the upper punch descends toward the cylinder and is fitted into the upper part of the cylinder, and then the two divided punches are pressed against the cylinder by the pressurizing means. The cylindrical body is moved toward the side die in a direction substantially perpendicular to the axis, whereby a predetermined portion of the side wall at both ends of the cylindrical body is moved between the convex portion of the forming surface of each punch and the concave portion of the forming surface of the side die. The hump portion is press-molded by being pressed so as to curve toward the recess. After the forming, the convex part of each punch is detached from the hump part by an operation opposite to that described above, and then the upper die is raised and the upper punch is detached from the cylinder body, and the side die is moved to remove the protrusion part from the hump part. The cylinder body with the hump portion formed thereon is taken out by removing the cylinder body from the cylinder body and then removing the cylinder body from the lower punch.

When the pressing means includes the center cam and the upper and lower cams provided on the center cam, when the upper punch is fitted into the cylindrical body by lowering the upper mold, The tip of the center cam is inserted into the cam hole of the lower punch, and the lower cam is engaged with the cam hole, and then the center cam is lowered together with the upper die relative to both punches, and the upper cam and the lower The cams slide downward through cam holes in the upper and lower punches, respectively. At this time, the upper cam of the center cam moves the upper punch toward the side die as described above, and the lower cam of the center cam moves the lower punch toward the side die, and these movements cause the upper punch to move toward the side die as described above. The hump part is press-molded as shown above.

Further, each of the punches and the side die is provided with the second
If a convex portion and a second concave portion are provided, at the same time as the hump portion is press-molded, each end of the cylinder body is formed between the second convex portion and the second concave portion. Then, it is pressed toward the second recess and curved in the same manner as in the formation of the hump section described above.

Further, when the moving means is provided on the upper die and includes the drive cam, the drive cam slides into contact with the outer surface of the side die as the upper die is lowered, and moves the side die toward the cylindrical body. , whereby the side die is fitted onto the outer peripheral surface of the cylindrical body. Therefore, the side die is externally fitted into the cylindrical body by the lowering movement of the upper die.

(Example) First, an outline of a method for manufacturing the wheel rim H described above using an example of the wheel rim hump forming apparatus of the present invention will be explained with reference to FIGS. 1 and 2 (a) to (d). do. FIGS. 2(a) to 2(d) are explanatory cross-sectional views for explaining the outline of the method for manufacturing the wheel rim H.

In this manufacturing method, first, both ends of the cylindrical body A shown in FIG. 2(a) made of iron-based alloy, aluminum alloy, etc. are expanded, and the wheel rim H is expanded as shown in FIG. 2(b). Preliminary flange portion Fa having a substantially similar shape to flange portions F, F2
1, Fa2 are molded to form the preliminary cylinder body B, and then the preliminary flange parts Fa+, Fa2 of the preliminary cylinder body B are formed at the end portions and hump portions, as shown in FIG.
The wheel rim H is formed into flange parts Fb+ and Fbz that have substantially the same shape as the flange part FI+F2 except for h2.
A cylindrical body C having approximately the same shape is formed, and then the flange portion Fb+ of the cylindrical body C and a predetermined portion of the side wall of Fbz are curved so as to protrude outward, as shown in FIG. 2(d). The wheel rim H is obtained by molding the hump portions h+, hz, and curving the ends of the flange portions Fb+, Fbz so as to protrude outward.

In such manufacturing, the steps up to the forming of the flange portions Fb+ and Fbz shown in FIG. 2(C) are performed, for example, by conventional press working, and the flange portions Fb.

The shaping of the end portion of Fb2 and the shaping of the hump portions h+ and hz are simultaneously performed by a hump portion shaping device described below.

This hump forming apparatus will now be described in detail with reference to FIGS. 3 to 7. FIG. 3 is an explanatory sectional view of the hump forming device 1 2 , FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3, and FIG. FIG. 6B is an explanatory diagram of the operation of the main part shown in FIG. 5A, FIG. 6 is an explanatory diagram of the operation of the hump forming device, and FIG.

In FIGS. 3 and 4, ■ is a lower mold equipped with a lower punch 2 that is fitted concentrically into the flange portion Fb2 on the lower side of the cylinder C whose axis is directed in the vertical direction; An upper punch 4 fitted concentrically into the upper flange portion Fb of the cylinder C is provided at a position above the lower punch 2, and the upper mold 5 is movable up and down together with the upper punch 4. A side die 6 is provided on the lower die 3 at a position around the fitted cylinder C, and 6 is the lower punch 2.
moving means for moving the side die 5 toward the cylinder C in order to externally fit the side die 5 onto the outer peripheral surface of the cylinder C into which the cylinder C is fitted; 7 denotes both punches 2 and 4 which are fitted inside the cylinder C is moved in a direction substantially orthogonal to the axis of the cylindrical body C, and the flange portions Fbl and Fb2 are attached to the side die 5 externally fitted onto the cylindrical body C.
It is a pressurizing means that presses towards.

The lower punch 2 is divided radially about its axis as shown in the fourth figure, and by this division, each divided punch 8 making up the lower punch 2 is placed on the lower mold 1 as shown in the third figure. It is mounted on a fixed lower punch base 9 so as to be movable in a direction perpendicular to the axis of the lower punch 2, and a guide hole 8a formed in each divided punch 8 is erected on the lower punch base 9. This engagement allows the lower punch 2 to move freely in the radial direction with respect to its axis. The lower surface of each divided punch 8 is connected to the lower punch base 9 via a spring 11 as shown in the third figure, and is biased toward the axis of the lower punch 2. As a result, in the normal state, each divided punch 8 are brought into contact with each other to form a continuous lower punch 2, and when these are moved in the radial direction from this state, they separate from each other so that the outer diameter of the lower punch 2 increases.

Further, on the outer circumferential surface of the lower punch 2, as shown in the third diagram, a forming surface 2a having substantially the same shape as the inner circumferential surface of the flange portion Fb2 is formed, and further, on the forming surface 2a, 3 4 The flange portion Fbz The hump portion h is attached to a predetermined portion of the side wall of the
A convex portion 2a+ for molding the flange portion Fbz and a convex portion 2az for curving the end of the flange portion Fbz are formed in a circumferential shape. These convex portions 2a+, 2az are arranged so that, at the dividing position of the lower punch 2, the convex portions 2a+, 2az of the adjacent dividing punches 8 are slidably overlapped with each other, as shown in FIG. 5(a). When the divided punches 8 are separated, the convex portions 2a+2at do not separate and continue over the entire circumference of the lower punch 2 as shown in FIG. 5(b). There is.

In the above-mentioned normal state, the lower punch 2 is fitted into the flange portion Fbz of the cylindrical body C concentrically with the flange portion Fbz, as shown in the third figure, thereby supporting the cylindrical body C.

The upper punch 4 is divided radially like the lower punch 2, and as shown in the third figure, each divided punch 12 has its guide hole 12a connected to the upper mold 3 by a pin 13 so as to be able to move up and down with respect thereto.
A pin 16 is suspended from the upper punch base 15 and is biased downwardly by a spring 14.
The upper punch 4 is engaged with the upper punch 4 so as to be freely movable in the radial direction in a direction perpendicular to the axis of the upper punch 4. And each division punch 12
is connected to the upper punch head 15 via a spring F and is biased toward the axis of the upper punch 4. In a normal state, each divided punch 12 contacts each other to constitute a continuous upper punch 4, and in this state When these are moved in the radial direction, they separate from each other so that the outer diameter of the upper punch 4 increases.

The outer circumferential surface of the upper punch 4 has a forming surface 4 having substantially the same shape as the inner circumferential surface of the flange portion Fb+, similarly to the lower punch 2.
a is formed, and a convex portion 4a+ for forming the hump portion on a predetermined portion of the side wall of the flange portion Fb.
and a convex portion 4 for curving the end of the flange portion Fb.
8z is formed in a circumferential shape. These convex portions 4al,
4a2 is the convex portion 2aI+ 2 a 2 of the lower punch 2
It has the same configuration as above, and is formed so as to be continuous over the entire circumference of the upper punch 4 without separating even when the divided punches 12 are separated as described above.

The upper punch 4 is biased downward by the spring 14 so as to be able to rise and fall freely with respect to the upper mold 3 together with the upper punch head 15, and in the normal state, it descends together with the upper mold 3 toward the lower mold 1. During its descent, the lower punch 2 is fitted into the flange portion Fbl of the cylindrical body C, concentrically with the flange portion Fbl, and is locked therein.

Like both punches 2.4, the side die 5 is divided radially as shown in the fourth figure, and each divided die 18 is connected to a slide base 19 provided on the lower mold 1 as shown in the third figure.
It is mounted above so as to be movable in the radial direction toward the cylindrical body C into which the lower punch 2 is fitted. As shown in the third figure, each divided die 18 is connected via a spring 21 to a backup member 20 erected on the side of the lower die 1, and is urged in a direction away from the cylinder C. As a result, in the normal state, the divided dies 18 are separated from each other as shown in the fourth figure, and when they are moved toward the cylinder C, they come into contact with each other to form a continuous side die 5.

Further, the flange portions Fb1. F
Forming surfaces 5x and 5y having substantially the same shape as b2 are formed, and the forming surfaces 5X are further provided with a convex portion 481+ of the upper punch 4.
482, a recess 5x+ for molding the hump portion h1 and a recess 5×2 for curving the end of the flange portion Fb are formed in a circumferential shape, and similarly, a molding surface 5y Concave portions 5y+ and 5yz are formed corresponding to the convex portions 2a+ and 2az of the lower punch 2, respectively. and,
These molding surfaces 5x5y and recesses 5xl+5xz,
5y+ and 5Vz are continuous over the entire circumference when each divided die 18 is moved toward the cylinder C and fitted onto the outer peripheral surface of the cylinder C.

The moving means 6 includes a guide member 22 that is vertically installed on the lower surface of the upper die 1 at a position above the gap between the backup member 20 and the divided dies 18 of the side die 5, as shown in the third diagram. 22 is formed with a drive cam 22a that engages with a cam surface 18a formed on the outer surface of each divided die 18 while the upper mold 1 is descending. Then, when the drive cam 22a and the cam surface 18a move each divided die 18 toward the cylinder C as described above as the upper die 1 descends, the drive cam 22a and the cam surface 18a will The guide member 22 is inserted into the gap so that the side diamond is fitted over the entire circumference of the outer peripheral surface of the cylindrical body C.

As shown in the third figure, the pressurizing means 7 presses both the punches 2.
A center cam 23 is provided on the upper punch base 15 and the upper punch 4, and the center cam 23 is provided vertically vertically on the upper die 3 and integrally with the upper die 4, and the center cam 23 is formed on the axes of the upper punch base 15 and the upper punch 4, respectively. It passes through the through hole 15a and the cam hole 4b and projects toward the lower punch 2. The center cam 23 has an upper cam 2 formed on the outer peripheral surface of its body.
3a is slidably engaged with the cam hole 4b of the upper punch 4,
A lower cam 23 is provided on the outer circumferential surface of the tip end of the center cam 23, which is slidably engaged with a cam hole 2b formed on the axis of the lower punch 2 when the center cam 23 is lowered together with the upper die 3.
b is formed.

The upper cam 23a of the center cam 23 and the cam hole 4b of the upper punch 4 are arranged so that when the center cam 23 is lowered together with the upper die 1 relative to the upper punch 4, each divided punch 12 of the upper punch 4 is Similarly, when the lower cam 23b and the cam hole 2b of the lower punch 2 are engaged, the center cam 23 is moved relative to the lower punch 2. When lowered, each divided punch 8 of the lower punch 2 is configured to move in the radial direction as described above.

Next, the operation of the hump forming device will be explained with reference to FIGS. 3, 6, and 7.

In this device, first, as shown in the third figure, the lower punch 2 is fitted into the flange portion Fbz of the cylindrical body C and is supported by the lower punch 2 concentrically, and in this state, the upper mold 3 is lowered. The upper punch 4 is lowered toward the mold 1 and lowered toward the cylinder C.

During this downward movement, first, the cam 22a of the guide member 22 of the moving means 6 moves each divided die 1 of the side die 5.
8 and each divided die 18 is moved toward the cylinder C as described above, and the guide member 22 is engaged with the backup member 20 and each divided die 1
As a result, each divided die 18 comes into contact with each other, and the continuous side die 5 is fitted onto the outer peripheral surface of the cylinder C over the entire circumference.

On the other hand, almost simultaneously with the external fitting of the side die 5, the upper punch 2 is inserted into the flange portion Fb of the cylindrical body C as shown in FIG.

The lower cam 23b of the center cam 23 of the pressing means 7 is engaged with the cam hole 2b of the lower punch 2.

Next, in FIG. 7, the center cam 23 is further lowered together with the upper die 3 relative to both punches 2.4, and the upper cam 2
3a and the lower cam 23b respectively fit into the cam hole 4 of the upper punch 4.
b and the cam hole 2b of the lower punch 2 downward, so that each divided punch 12 of the upper punch 4 and each divided punch 18 of the lower punch 2 are perpendicular to the axis of the cylinder C, as described above. Both punches are moved radially in the direction of 2.
Both punches 2.
The respective molding surfaces 2a and 4a of the side die 5 move toward the molding surfaces 5x and 5y of the side die 5, respectively.

At this time, the convex portion 4a of the forming surface 4a of the upper punch 4.

4a2 are the concave portions 5X+ + of the molding surface 5X of the side die 5 while remaining continuous without separating as described above.
5 moving toward As a result, a predetermined portion of the side wall of the flange portion Fb is curved into the recessed portion 5XI, and the hump portion h
1 is molded, the end of the flange portion Fb+ is bent into a recess 5X2, and the flange portion Fb+ is bent as shown in FIG.
b is formed on the flange portion F1 of the wheel rim H.

On the other hand, at the same time, the convex portion 2'' + +2 a 2 on the forming surface 2a of the lower punch 2 also connects a predetermined portion and end of the side wall of the flange portion Fb2 to the cylindrical body in the same manner as described above in FIG. Side die 5 in the direction perpendicular to the axis of C
is pressed over the entire circumference toward the recesses 5y+, 5yz of the molding surface 5y, whereby a predetermined portion of the side wall of the flange portion Fb2 is curved into the recess 5y+ to form the hump portion h2, and the flange The end of the portion Fb is curved into the recess 5yz, and the flange portion Fb2 is bent into the flange portion F as shown in Figure 126.
1.

At the same time as these forming operations are completed, the lowering of the upper mold 3 is stopped and a wheel rim H is obtained between both punches 2 and 4 and the side die 5 as shown in the sixth figure, and then the upper mold 3 is lowered by the reverse operation as described above. The die 3 is raised, the upper punch 4 and the side die 5 are detached from the wheel rim H, and then the wheel rim H is detached from the lower punch 2 and taken out. At this time, each of the divided punches 12 of the upper punch 4 is moved in the opposite direction to the above, and the convex portions 4a+ and 4az of the upper punch 4 are detached from the hump portion and the end of the wheel rim H, respectively. Later, since it rises together with the upper die 3, it can be removed from the wheel rim H without any problem, and when the wheel rim H is taken out, it can also be removed from the lower punch 2 without any problem in the same way as described above.

As described above, in this embodiment, both punches 2.4 fitted inside the cylinder C are moved toward the side die 5 in a direction perpendicular to the axis of the cylinder C by lowering the upper die 3. Since the curved portions such as the hump portions, I'1g, etc. are molded to protrude outward, the hump portions,
Wheel rim H is formed by pressing H2 etc. without any problems.
can be obtained. And during this press processing,
The convex portion 4 al of each divided punch 12 of the upper punch 4,
48g and the convex portion 2 of each divided punch 8 of the lower punch 2
Since both of al and 2az are formed so that they do not separate, the hump portions, h, etc. can be reliably molded over the entire circumference.

In this embodiment, the convex portions 4a++4a2 of each divided punch 12 of the upper punch 4 and the convex portions 2a+, 28z of each divided punch 8 of the lower punch 2 are shown in FIG. 5(a).
For example, as shown in FIG. The convex portions 2a+, 2az of the punch 8 are formed so as to fit in a concave and convex manner, so that the convex portions 2a, 2az, respectively, are formed as shown in FIG. 8(b) during the press working.
) It is also possible to prevent them from separating as shown in FIG.

(Effects) As is clear from the above description, according to the wheel rim hump forming device of the present invention, the upper punch and the lower punch fitted into both ends of the cylindrical body having substantially the same shape as the wheel rim are When fitted, the cylinder is divided into parts so as to be movable in a direction substantially perpendicular to the axis of the cylinder towards the side die fitted externally to the cylinder, and when both punches are fitted internally, both punches are moved towards the side die to separate each punch. A pressurizing means is provided to press a predetermined portion of the side wall at both ends of the cylinder between the convex portion provided on the side die and the four portions provided on the side die, so that the pressing process when the upper mold is lowered is Then, a predetermined portion of the side wall at both ends of the cylinder is pressed in a direction substantially perpendicular to the axis of the cylinder between the convex portions of both punches and the recess of the side die to form a hump portion curved so as to protrude outward. After the molding, both punches and the side die can be detached from the cylindrical body in which the hump part has been molded without any problem. Therefore, the hump part can be molded by press working without any problem.

The pressurizing means includes a center cam provided on the upper mold, an upper cam provided on the center force L and engaged with a cam hole of the upper punch, and a cam hole provided on the center cam and engaged with a cam hole of the lower punch. and a lower cam that is engaged with the cylindrical body, when both punches are fitted into the cylinder, the center cam moves down with the upper die relative to the two punches, so that both punches move toward the side die. By moving in a direction substantially perpendicular to the axis of the cylinder, the hump portion can be efficiently formed in the pressing process when the upper die is lowered.

Further, each of the punches and the side die is provided with the second
When the convex part and the second concave part are provided, at the same time as the hump part is formed, both ends of the cylindrical body are pressed so as to be curved so as to protrude outward without any trouble, and the wheel rim is formed. Can be molded.

In addition, in the case where the upper mold is provided with a moving means for moving the side die and fitting it externally into the cylinder, and a drive cam for moving the side die toward the cylinder is provided, the lowering movement of the upper mold causes the upper mold to move. The side die can be fitted onto the cylindrical body, and the hump portion can be efficiently formed.

[Brief explanation of drawings]

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 manufacturing method of the wheel rim shown in the first figure, FIG. 3 is an explanatory cross-sectional view of an example of the hump forming device of the present invention, and FIG. IV-IV
Line sectional view, Figure 5 (a) is a V view of Figure 3, Figure 5 (b)
) is an explanatory diagram of the operation of the part shown in Figure 5(a), and Figure 6 is an illustration of the operation of the part shown in Figure 3.
FIG. 7 is an explanatory diagram of the operation of the hump forming device shown in the figure, FIG. 7 is an explanatory diagram of the operation of the main part of the device, and FIGS. FIG. 2 is an explanatory diagram for explaining the configuration. 3... Upper die 4... Upper punch 4a...
- Forming surface 4a+ of upper punch...Convex portion 4a2 of upper punch...Second convex portion 4b of upper punch...Cam hole 5 of upper punch...Side die 5x, 5y...Molding of side die Surface 5 X + + 5 y +... Recess 5 X2.
5 yz...Second recess 6...Moving means
22a... Drive cam 7... Pressurizing means
23...Center cam 23a...Upper cam
23b...Lower cam C...Cylinder body H...
・Wheel rim h, h2...Hump part 1...Lower die 2...Lower punch 2a...
- Molding surface 2a+ of lower punch...Protrusion 2az of lower punch...Second protrusion 2b of lower punch...Cam hole 78 Zol (702) 2C11 (2C12) of lower punch

Claims (1)

[Scope of Claims] 1. Hump portions curved so as to protrude outward on the side walls of both ends of a cylindrical body formed to have substantially the same shape as the wheel rim for manufacturing automobile wheel rims. The apparatus includes: a lower punch that is installed in a lower mold and is fitted into the lower part of the cylindrical body with its axis oriented in the vertical direction; and an upper mold that descends toward the lower mold and is movable An upper punch is provided and fitted into the upper part of the cylindrical body into which the lower punch is fitted when the upper punch is lowered, and an upper punch which is provided on the lower die at a position around the cylindrical body into which the lower punch is fitted and which is inserted into the cylindrical body. A side die is divided so as to be movable toward the cylindrical body to a position where it is externally fitted onto the outer circumferential surface of the cylinder, and a moving means is provided that moves the side die when the upper die is lowered so that the side die is externally fitted onto the outer circumferential surface of the cylindrical body. , a convex portion forming the hump portion is provided circumferentially on a forming surface formed on the outer circumferential surface of each of the punches, and a concave portion forming each hump portion is provided on the forming surface formed on the inner circumferential surface of the side die. The punches are provided in a circumferential shape and are divided so as to be freely movable in a direction substantially perpendicular to the axis of the cylinder toward the side die fitted externally to the cylinder while both punches are fitted inside the cylinder. At the time of the internal fitting, both punches are moved toward the side die and predetermined portions of the side walls at both ends of the cylinder are pressed toward the concave portion between the convex portion of each punch and the concave portion of the side die. . A wheel rim hump forming device, comprising: a pressurizing means for bending the predetermined portion into the recess to form the hump. 2. The upper punch is provided so as to be able to rise and fall freely with respect to the upper die and is biased downwardly, and the pressurizing means passes through a cam hole formed in the center of the upper punch and presses the upper die. A center cam is integrally provided with the center cam and is provided at the base of the center cam and protrudes downward so as to be freely raised and lowered.The upper punch is slidably engaged with the cam hole of the upper punch. an upper cam that moves the upper punch toward the side die by lowering the center cam when the center cam is fitted into the body; and an upper cam provided at the tip of the center cam and at the center of the lower punch when the upper die is lowered. a lower cam that slidably engages in a cam hole formed in the wheel rim and moves the lower punch toward the side die by lowering the center cam. Part forming equipment. 3. At the same time as forming the hump portion, a second convex portion and a second concave portion curve the end portion of the cylindrical body so as to protrude outward between the respective punches and the side die, respectively. 2. The wheel rim hump forming device according to claim 1, wherein the wheel rim hump forming device is provided on a forming surface of the wheel rim and a forming surface of a side die. 4. The moving means is provided on the upper mold, and includes a drive cam that slides into contact with the outer surface of the side die during the lowering of the upper mold to move the side die toward the cylindrical body. Item 1. The wheel rim hump forming device according to item 1.