JP2852614B2 - Rotary forging equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary forging device,
The upper mold and the lower mold are opposed to each other, and a work material (hereinafter, referred to as a work) made of an aluminum alloy or a magnesium alloy is interposed between the upper mold and the lower mold. The present invention relates to an apparatus for molding a material protruding outward from these two molds into a rim cross section by rollers arranged outside a boundary between the two molds.

[0002]

2. Description of the Related Art As a rotary forging apparatus of the type described above, there is already a rotary forging apparatus disclosed in Japanese Patent Application Laid-Open No. 61-226132. In this apparatus, as shown in FIG.
The work (10) is pressed by the lower surface of the mold (301) and the upper surface of the second mold (302) to form the disk portion (1).
A molding roller (2) is disposed on the side of the boundary between the mold (301) and the second mold (302) so that the molding roller (2) can be driven in the horizontal direction.

The lower surface of the first mold (301) is formed in a conical surface (umbrella shape), and its rotation axis is set so that one side (generic line of the conical surface) of the cross section is substantially horizontal. It is supported in an inclined position. The rotation axis of the other second mold (302) is upright. Therefore, the first mold (301) and the second mold (30)
2) and the first mold (301) is pushed down, and the work (10) is brought into contact with the lower surface of the first mold (301) and the second mold (301).
Disk part molded in a shape following the upper surface of the mold (302)
(1) and a rim (11) molded by the body of the first mold (301) and the second mold (302) and the molding roller (2).

The cross section of the rim (11) is
In the case of a rectangular cross section symmetrical with respect to the rim portion (11), the cross-sectional shape of the rim portion (11) is excellently finished. For example, as shown in FIG. In the meantime, the cross section of the rim portion (11) after molding is apt to cause a scratch (19). The cause will be described.

[0005] When molding the cross-sectional shape, the rim (11)
Roller with angled ribs on the body that match the cross-sectional shape of
(2) is used. Then, at the time of rotary forging, the molding roller (2) is fixed at a position where its angled rib coincides with the rim portion (11). In this state, the first mold (301) and the second mold (3
02), the workpiece (10) is lowered, and the material that is spread or extruded from the boundary of the pressing end faces of these dies to the outer peripheral side is formed into a rim cross section.

However, as shown in FIG. 3, the center of the thickness of the work (10) before the work (10) is pressed down and the forming roller
The top (22) of the chevron rib on the body of (2) does not match.
Therefore, in the initial stage of the rolling step, the top portion (22)
The thickness of the material extruded upward is thicker than the thickness of the material extruded downward. Then, as the rolling progresses, the thickness of the material extruded to the upper side of the top portion (22) gradually decreases, and the thickness of the material extruded to the lower side gradually increases. Have the same thickness.
For this purpose, in the process of molding the rim (11),
Part of the material extruded above the top (22) is
, But the movement of this material is not smooth. As a result, a flaw (19) is generated in the valley of the cross section of the rim (11).

In order to solve this inconvenience, a method of forming the rim portion into a rectangular shape once and then forming it into a V-shaped cross section by using another forming roller, as in the above-mentioned prior art, can be considered. However, in this case, it is necessary to switch the rollers for molding, so that the productivity is not sufficient. The present invention has been made in view of the above point, and is described as follows. "A synchronously rotating first mold (301) and a second mold (302) are vertically opposed to each other, and are formed on the sides of these boundaries. A roller (2) is arranged, and a work (10) is interposed between the first mold (301) and the second mold (302) to make the two molds relatively approach to each other, thereby making the work (10) Rim part (11) having a V-shaped or U-shaped cross section as a whole by using one forming roller (2). ), The rim (11) should not be damaged, and the rim (11) having an asymmetric cross-sectional shape with respect to the disc (1) should be formed. The subject. [About the invention of claim 1]

[0008]

[Technical Means] The technical means of the present invention taken to solve the above-mentioned problem is described in "2nd mold (302) provided at fixed position".
The first mold (301) is driven to move up and down, and the molding roller (2) is supported by a supporting device (4) in a rotatable and upright posture. The supporting device (4) includes a molding roller (2). ), A vertical driving device (41) for driving the supporting position of the molding roller (2) in the vertical direction, and a horizontal driving device (42) for driving the supporting position of the molding roller (2) in the horizontal direction.
The mold (301) is configured to be driven up and down by a hydraulic lifting drive (5), and the drive pressure of the lift drive (5) is adjusted by moving the first mold (301) to the second mold (302) side. Hydraulic pressure control means (601) for switching between a first set pressure for moving to a second position and a second set pressure for rotary forging;
Origin position detecting means (602) for detecting an origin position where the first mold (301) is brought into contact with the work (10) by the first set pressure; and the hydraulic pressure control means (601). When the origin position detection signal is input from the origin position detecting means after the start of the elevation drive device (5), the drive pressure of the elevation drive device (5) is changed from the first set pressure to the second set pressure. Switching configuration ".

[0009]

The above technical means of the present invention operates as follows. For example, a case will be described in which a V-shaped wheel whose cross-sectional shape of the rim portion (11) is horizontal is formed. The first mold (3
The workpiece (10) is pressed down by the first mold (301) and the second mold (302).
(302) begins to protrude from the boundary of the pressing end face, the vertical drive device (41) and the horizontal drive device (42) are operated to move the angled rib at the body center of the molding roller (2) into the first mold ( 301) and the periphery of the end surface of the second mold (302). Then, the material projecting portion is vertically divided into two.

Thereafter, the work (10) is continuously lowered. During this time, the vertical drive unit (4) is set so that the center of the body of the molding roller (2) is located between the first mold (301) and the second mold (302).
1) is controlled. Then, each part of the rim section extending vertically along the body of the molding roller (2) has the same thickness, and at the time of completion of the reduction, the outer peripheral parts of the first mold (301) and the second mold (302) are molded. The disk portion (1) is formed by the body of the roller (2).

As described above, even when the rim portion (11) having the V-shaped cross section is formed, the material once divided into upper and lower portions by the forming roller (2) is directly formed into the rim portion (11).

[0012]

According to the present invention having the above-described configuration, the present invention has the following specific effects. When forming a rim portion (11) having a V-shaped cross section or a U-shaped cross section as a whole, a forming roller is used in the process of rotary forging.
Since the material divided into upper and lower parts by (2) is directly molded into the upper and lower rim portions, there is no fear that the rim cross section after molding is damaged.

By selecting the shape of the molding roller (2), rims (11) having various cross-sectional shapes can be formed in the first mold (3).
01), the second mold (302) and one molding roller (2), so that molding can be performed in one step. Further, by selecting the position of the molding roller (2), the first mold (30) can be formed.
The material extruded from between 1) and the pressurized end face of the second mold (302) is temporarily protruded only along one of the first mold (301) and the second mold (302). Therefore, a product in which the rim portion (11) is asymmetric with respect to the disk portion (1) can be manufactured. For example, rim (11)
In contrast, the apparatus is suitable for manufacturing an automobile wheel in which the disk portion (1) is biased outward. Further, when the first mold (301) comes into contact with the work (10), the drive pressure of the elevation drive device (5) is reduced by the action of the hydraulic pressure control means (601) by the origin position detection means (602). Since the pressure is switched to the set pressure, the workpiece (10) is not partially and excessively lowered.

The rotation start time of the first and second dies is the first time.
It may be before or after the mold (301) reaches the origin position. [Other inventions] According to a fourth aspect of the present invention, in the first aspect of the present invention, the rim portion (11) is automatically moved to a predetermined position by moving the molding roller (2) along a preset path. It is formed into a cross-sectional shape. In particular, the present invention is applicable to a case where it is not necessary to control the horizontal moving distance.

The technical means adopted for this purpose are "moving distance detecting means (501) for detecting the moving distance of the first mold (301) toward the second mold (302)"; Based on the detection distance of the moving distance detection means (501), the dimension of the reduction from the origin position of the die (301) or the initial forging end position where the work (10) is lowered by a certain degree toward the second die (302) is determined. Dimension calculating means (50), which calculates the horizontal movement start signal of the forming roller (2), and the vertical movement of the forming roller (2) preset according to the output value from the reducing dimension calculating means (50). A molding roller control device that outputs a movement value, and a vertical movement value from the molding roller control device is input to the vertical driving device (41) and a horizontal movement start signal is input to the horizontal driving device (42). 』
That is.

In the apparatus employing this technical means, the horizontal movement start timing and the vertical movement distance of the molding roller (2) from the initial position and the vertical movement distance are determined by the molding roller control device, ie, the pressure reduction stroke of the work (10), Reduction dimension calculation means (5
It is automatically set according to the output value of (0). Therefore, the first
When a part of the work (10) is extruded from the boundary between the pressing end surfaces of the mold (301) and the second mold (302), the molding roller (2) moves along a locus set in advance according to the amount of material projection. Move to the rim (1
The cross-section molding of 1) can also be automated.

According to a sixth aspect of the present invention, in the first aspect of the present invention, the control of the horizontal moving distance and the vertical moving distance of the molding roller (2) can be simultaneously performed, so that the molding roller (2) has a complicated sectional shape. The technical means employed for this purpose is "moving distance detecting means (detecting the moving distance of the first mold (301) toward the second mold (302)". 501) and the reduction distance of the work (10) from the origin position of the first mold (301) or the initial forging end position where the work (10) has been lowered by a certain degree is the detection distance of the moving distance detection means (501). And a reduction dimension calculating means (50) for calculating based on the
A molding roller control device for outputting a preset vertical movement value and horizontal movement value of the molding roller (2) in accordance with the output value from 0), and vertically driving the vertical movement value from the molding roller control device. The horizontal movement value is input to the horizontal drive device (42) while being input to the device (41). "

According to this configuration, the reduction dimension calculating means (50)
The vertical movement value of the molding roller (2) set according to the output value from the roller is input to the vertical driving device (41), and the horizontal movement value is input to the horizontal driving device (42). ) Is moved in both the horizontal and vertical directions along a path set in advance according to the reduction dimension of the work (10). Therefore, a rim portion (11) having a complicated cross-sectional shape can be molded. For example,
The cross section of the rim (11) is complicatedly bent, or the rim (11)
However, wheels that are asymmetric with respect to the disc (1) can also be molded automatically.

According to a seventh aspect of the present invention, in the sixth aspect, the present invention can be applied to a case where the cross-sectional shape of the rim portion (11) is more complicated. Means are that the shape of the body of the first mold (301) and the shape of the body of the second mold (302) follow the shape of the inner peripheral surface of the rim (11), and the forming roller ( The torso of 2) follows a part of the outer peripheral surface of the rim (11). "
That is.

In this apparatus, the body of the molding roller (2) is made to follow a part of the shape of the outer peripheral surface of the rim (11), and this is set in advance according to the amount of reduction of the work (10). Since the molding roller (2) is moved in the horizontal and vertical directions along the path, it can be applied to a case where the outer peripheral surface of the rim (11) is more complicated.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. As shown in FIG. 4, in the rotary forging apparatus of this embodiment, similarly to the conventional apparatus, a first mold (301) and a second mold (302) that are synchronously rotated face each other up and down. A molding roller (2) is arranged on the side of the boundary between the pair of dies. This is an apparatus for molding the rim portion (11) into a V-shaped cross section in the same manner as in the conventional case (see FIG. 9).

The first mold (301) has a rotation axis 2
The lower surface is a conical surface with a large apex angle. In this embodiment, one side of the longitudinal section of the conical surface is substantially horizontal in the inclined position of the first mold (301). The body of the first mold (301) has a frusto-conical shape in which the diameter of the lower end is larger than the diameter of the upper end, and corresponds to the upper inner peripheral surface of the rim (11) within a certain range from the lower end. A rim forming part (33) is provided.

Then, the lower surface of the first mold (301) serves as a pressing end surface for forming the upper surface of the disk portion (1). The second mold (302) is constituted by a cylindrical body supported upright and rotatably. The upper surface is a pressure end surface for forming the lower surface of the disk portion (1), and a rim forming portion (32) corresponding to the lower inner peripheral surface of the rim portion (11) is provided within a certain range from the upper end of the body portion. I have.

[0024] The first mold (301) is provided with a horizontal rail of a fixed arch.
First hydraulic cylinder (55) attached to (51) (corresponding to hydraulic lifting drive (5) defined in claims)
And is moved up and down while maintaining the above inclined posture. For this purpose, the first mold is provided by the lifting frame (52) attached to the output shaft of the first hydraulic cylinder (55).
(301) is rotatably held, and a guide shaft (521) attached to the lifting frame (52) penetrates the horizontal rail (51). Since the guide shaft (521) is disposed in parallel with the output shaft of the first hydraulic cylinder (55), the lifting frame (52) maintains a constant posture in accordance with the advance / retreat of the output shaft. It will go up and down. Further, a first drive device (53) is attached to the lift frame (52) and is transmitted to the first mold (301).

The second mold (302) is rotatably held by a holding table (31), and is in gear transmission with a second driving device (54) provided on the holding table (31). By controlling the rotation direction and rotation speed of the first drive device (53) and the second drive device (54) by the rotation control device (61), the first mold (301) and the second mold (30) are controlled.
Synchronous rotation is performed in the same direction as in 2).

The molding roller (2) comprises a first mold (301) and a second mold (301).
The first mold (301) is disposed on the side of the boundary of the mold (302) at a position in the direction in which the rotation axis of the first mold (301) is inclined. The forming roller (2) includes a vertical driving device (41) and a horizontal driving device (42).
This is a configuration supported by The molding roller (2)
An annular chevron rib (20) is formed at the center of the body, and cylindrical portions (23) (23) having the same diameter are formed above and below it. The forming roller (2) is rotatable by a bearing frame (43) provided at an end of an output shaft of a second hydraulic cylinder (420) (corresponding to the horizontal drive device (42) defined in the claims). It is supported in an upright posture. To maintain this support position,
A guide shaft (45) protruding horizontally from a mounting (44) of the second hydraulic cylinder (420) is attached to the second hydraulic cylinder (4).
20) is provided in parallel with the output shaft of
4) is slidably penetrated.

The vertical driving device (41) includes a servo motor (410)
A feed screw mechanism (46) comprising a combination of a feed screw driven by the screw and penetratingly screwed into the mounting base (44), and a guide shaft slidably penetrating the mounting base (44).
And the servo motor (410). The servomotor (410) has a built-in drive circuit, and is configured to rotate by an angle corresponding to the number of pulses input to the drive circuit.

As the moving distance detecting means (501), a pulse encoder (50) for measuring the rotation angle of the detecting roller brought into contact with the output shaft of the first hydraulic cylinder (55) in a rolling contact state is used.
0) is adopted. In the pulse encoder (500), the measured value when the lift frame (52) is at the highest position is zero, and the distance that the lift frame (52) has dropped from the zero point position is output as the measured value. Things.

The measured value of the pulse encoder (500) is input to a control device (6) for controlling the operation amount and the like of the vertical drive device (41) and the horizontal drive device (42). This control device
(6) includes a hydraulic pressure control means (601) and an origin position detection means (602)
And a molding roller control device. Then, based on the input signal, the control device (6) outputs operation signals to the first hydraulic cylinder (55), the servomotor (410), and the second hydraulic cylinder (420). Also, the rotation control device
(61) controls the rotation of the first and second molds (301) and (302).

A microcomputer is employed as the control device (6) of this embodiment, and outputs an operation signal shown in the flowcharts of FIGS. 5 and 6 to each section. The operation of the apparatus of the above embodiment will be described in detail below based on the flowchart. In the initial setting state of the above device, the lifting frame (52) is at the highest position, and the molding roller (2) is at the position farthest and highest from the first mold (301) and the second mold (302). It is in. Then, the first driving device (53) and the second driving device (54) are stopped.

In this state, a disk-shaped work having a constant thickness is formed.
(10) is placed on the upper surface of the second mold (302). At this time, the lower surface of the first mold (301) is slightly separated from the upper surface of the work (10). From this state, the control of the control device (6) is executed based on the flowcharts of FIGS.

First, only the first hydraulic cylinder (55) operates to lower the lifting frame (52). The first hydraulic cylinder at this time
The drive pressure of (55) is set to a first set pressure that does not lower the work (10). Then, when the first mold (301) descends and its lower surface comes into contact with the upper surface of the work (10) as shown in FIGS. 4 and 7, the descending movement of the first mold (301) stops. Is done. This stop position of the first mold (301) becomes the origin position.

At this time, the output value (α ₀ ) of the pulse encoder (500) is stored. (Step 71) Whether or not the lowering movement of the first mold (301) has been stopped is determined based on whether or not the output value of the pulse encoder (500) changes. Then, in step 70, the first mold (301) moves the work (10).
Is determined to be in contact with the upper surface of. Therefore, this step 7
0 is the origin position detecting means (60
It corresponds to 2).

Thereafter, the rotation control device (61) is turned on, the first mold (301) is driven by the first drive device (53), and the second mold (302) is driven by the second drive device (54). Are respectively driven to rotate, and the first mold (30) is controlled by the rotation control device (61).
1) and the second mold (302) are in a synchronous rotation state. Since the masses of the first mold (301) and the second mold (302) are large, after this, a certain waiting time is required until the first mold (301) and the second mold (302) are in a steady rotation state. To secure. (Step 7
2) After the elapse of the standby time, the first hydraulic cylinder (55) is driven at a high drive pressure (second set pressure) capable of lowering the work (10). As a result, the work (10) is lowered and rotationally forged. In the initial stage of this reduction, the work (10) is
(301) and the pressing end surface of the second mold (302). Then, as the reduction proceeds, first, a part of the work (10) starts to be extruded from the pressing end surface.

Then, the reduction dimension is equal to the work (10).
When the output value of the pulse encoder (500) reaches (α ₀ + Δα ₁ ) when the first set value (Δα ₁ ) is determined from the relationship between the diameter of the disk forming portion and the size of the disk forming portion, FIG. As described above, the edge (101) of the protruding material extruded from the disc molding portion coincides with the valley in the cross section of the rim portion (11) of the product.

At this time, the driving pressure of the first hydraulic cylinder (55) is reduced to the first set pressure. (Step 73) In this state, the servo motor (410) is driven forward (Step 741), and the forming roller (2) is moved to the initial position (in this embodiment, the position where the forming roller (2) rises most is the initial position). )
Is moved downward by the initial descent distance (β ₀ ). (Step 742) This initial descent distance (β ₀ ) is determined by the position of the top (22) of the angled rib (20) of the molding roller (2) at the initial position and the position of this top
The distance until (22) coincides with the middle of the edge (101).

Thereafter, the second hydraulic cylinder (420) is driven forward to move the cylindrical portions (23) and (23) to the first mold (301) and the second mold.
(302). (Step 75) The protruding height of the top portion (22) from the cylindrical portion (23) matches the shape of the groove on the outer peripheral surface of the finished rim portion (11). Therefore, in this state, the top (22) is at the edge (101).
Opposite the middle position of

Thereafter, the drive pressure of the first hydraulic cylinder (55) is returned to the second set pressure, and the work (10) is reduced. Thereafter, from the second hydraulic cylinder (420) to the forming roller (2)
The forming roller (2) is driven downward by controlling the servo motor (410) while the horizontal thrust applied to the roller is kept constant. In other words, the pulse encoder after the point at which the reduction amount of the work (10) has reached the first set value
Each time the output value of (500) increases by a unit dimension (Δα), the forming roller (2) is driven down by half the distance. (Step 771 to Step 774) Specifically, in Step 771, the pulse encoder (500)
The output value (αi) at that time is stored, and thereafter,
When it is determined in step 772 that the reduction by the second set pressure has progressed and the reduction dimension has become the unit dimension Δα, the servo motor (410) is driven forward (step 772).
773), the falling dimension Δβ is half of the unit dimension (Δα /
The forming roller (2) is driven down until the condition 2) is reached (step 774). The steps 771 and 772 are the reduction dimension calculating means (50) defined in the claims.

Thereafter, each time the rolling dimension increases by the unit dimension Δα, the above operation is repeated. During this time, it is constantly monitored whether or not the total reduction dimension of the work (10) has reached the final second set value (Δα ₂ ) (step 76). Work (10)
When the total rolling dimension of the first mold (301) reaches the second set value (Δα ₂ ), the first mold (301) descends most. In this state, the material of the portion sandwiched by the disc molding portions on the lower surface of the first mold (301) and the upper surface of the second mold (302) is molded into the disk portion (1). Then, the drive pressure of the first hydraulic cylinder (55) is returned to the first set pressure state.

Thereafter, while the molding roller (2) is maintained at the height determined in relation to the second set value (Δα ₂ ), the first mold (301) and the second mold (302) are maintained. ) Is kept in a rotating state for a certain time (for example, about 10 seconds to 1 minute).
(FIG. 6, step 78) As a result, the molding is finished by the molding roller (2), and the rim portion (11) has a final sectional shape as shown in FIG.

As described above, in the rotary forging step, the forming roller (2) is always located at the middle in the thickness direction of the material protruding outward from the pressing end faces of the first and second molds (301) and (302). Top of (22)
Is located. Therefore, the amount of the material moving to the upper side of the top (22) is equal to the amount of the material moving to the lower side. Finally, the outer peripheral surface of the body of the molding roller (2) and the first mold (301)
Rim molding part (33) and second mold (302) rim molding part (32)
Thereby, the cross section of the rim portion (11) is accurately molded.

When the above-described molding process is completed, first, the first driving device (53) and the second driving device (54) are stopped by the output of the rotation control device (61), and the servo motor (410) and the second driving device (54) are stopped.
The forming roller (2) is returned to the initial position by the hydraulic cylinder (420). Thereafter, the lifting frame (52) and the first mold (301) are returned to the initial positions by the reverse drive of the first hydraulic cylinder (55).

Thus, the cross-sectional shape of the rim portion (11) is
A series of steps for forming the character-shaped wheel is completed.
In this embodiment, the steps in the flowchart of FIG.
The steps from 741 to 774 for controlling the servomotor (410) and the second hydraulic cylinder (420) are the forming roller control device.

When the output value of the pulse encoder (500) becomes (α ₀ + Δα ₁ ), the position of the first mold (301) is shifted from the origin position by a first set value (Δα ₁ ). 10) is the lowered position, and this position is the initial forging end position. If the height of the initial position of the molding roller (2) is set at the initial forging end position, the height of the molding roller (2) is reduced with the pressure of the work (10) based on the initial forging end position. The height may be controlled.

[Embodiment 2] In this embodiment, as shown in FIG. 11, an apparatus for manufacturing a product in which the rim portion (11) is asymmetric with respect to the disk portion (1) is implemented. As shown in FIGS. 12 and 13, the control device (6) controls the forming roller (2) to move in both the horizontal and vertical directions with respect to the protruding material.

In this embodiment, as shown in FIG. 12, the first drive unit (53) is attached to the cross rail (51), and the first drive unit (5) is connected to the first drive unit (5) by a telescopic joint using spline fitting.
The output shaft of 3) is connected to the input shaft of the gear mechanism of the first mold (301). The other second driving device (54) is transmitted to the second mold (302) as in the first embodiment. In the forming roller (2), a large part of the upper half becomes a truncated cone portion (24), and a columnar portion (231) having the same diameter as the upper end thereof is continuously provided. A cylindrical portion (232) of the same diameter continues from the lower end, and the cylindrical portion (232) occupies the lower half of the forming roller (2). The support device (4) for supporting the molding roller (2) includes an up-down drive device (41) and a horizontal drive device (42) as shown in FIG. Each of these driving devices is a combination of a servo motor (411) (412) and a feed screw mechanism. These servo motors (411) and (412) are of the same type as the servo motor (410) of the first embodiment.

Also in this embodiment, the pulse encoder (500)
Based on the signal from the first hydraulic cylinder (55), and
The servo motors (411) and (412) are controlled by the microcomputer, and each unit operates as follows. In addition, the first mold
(301) is lowered to the origin position, and thereafter, the flowchart of FIG. 5 is executed as it is until the initial forging ends.
(Up to Step 73 in FIG. 5) Thereafter, until the end of the rotary forging, control based on the flowchart shown in FIG. 19 is executed.

Then, the molding roller (2) is moved from the initial position to the position shown in FIG. 10 by the operation of the servo motors (411) and (412). And the lower column (232) is the second mold
(302) is maintained in contact with the torso. (Step
743 to 745) Thereafter, the first hydraulic cylinder (55) is operated at the second set pressure to lower the work (10).

The first mold (301) and the second mold (301)
The material starts to protrude from the boundary of the mold (302). Then
The protruding material is molded in a manner to be bent upward by a truncated conical portion (24) and an upper cylindrical portion (231), and is formed into an upper rim portion (1).
11). The upper rim portion (111) grows as the rolling dimension increases. This upper rim
When the protrusion length of (111) reaches the set value, that is, when the output value of the pulse encoder (500) reaches the third set value (α ₄ ), the servo motors (411) and (412) are operated. And FIG.
As shown in (2), the cylindrical portion (232) below the forming roller (2) is moved outside the boundary between the first mold (301) and the second mold (302), and these molds (301) ( 302) torso and said column (232)
Is made equal to the thickness of the upper rim portion (111).
(Steps 776 to 778) As a result, the material protruding from the boundary between the first mold (301) and the second mold (302) is separated into upper and lower sides by the cylindrical portion (232), and the upper rim portion (111) is separated. And the lower rim portion (112) are molded at the same time. When the first mold (301) is at its lowest position, the lower surface of the first mold (301) and the second mold (30) are lowered.
The material pinched by the upper surface of 2) is molded into the disk part (1). In addition, the upper rim (111) and the lower rim (1
The protruding length of the 12) from the disk portion (1) becomes a preset value. At this time, the first mold (301) falls by Δα ₂ from the origin position. This is what step 761
Is determined.

As a result, the product shown in the figure is manufactured by rotary forging. Thereafter, the first driving device
(53) and the second driving device (54) are stopped, and the first mold (301) is stopped.
Then, the rotation of the second mold (302) is stopped, and then the first hydraulic cylinder (55) is driven to return to lift the first mold (301). Further, the molding roller (2) is driven to return to the initial position. Then, the product can be taken out from the second mold (302).

[Embodiment 3] This embodiment relates to an apparatus for manufacturing the automobile wheel shown in FIG.
As shown in the figure, the first mold (301) and the second mold that rotate synchronously
(302) and an auxiliary type (303). The shapes of the pressing end surfaces of the first mold (301) and the second mold (302) are adapted to the shape of the disk portion of the vehicle wheel. Furthermore, the second mold (30
The shape of the trunk from 2) to the auxiliary type (303) should be matched to the cross-sectional shape of the rim. Also, the shape of the body of the molding roller (2) is adjusted to the shape of the rim cross section. By moving the molding roller (2) to a predetermined position in accordance with the degree of reduction of the work (10), an automobile wheel is finished from the work (10) to a final product.

In this case, an auxiliary mold (303) coaxial with the second mold (302) is fitted on the first mold (301) so as to be relatively rotatable. The auxiliary mold (303) corresponds to an area above the area corresponding to the area of the drop center (110) of the rim (11), and has an outer diameter at the lower end thereof and a lower end of the first mold (301). The diameter is almost the same. The body of the auxiliary mold (303) has a tapered surface (34) expanding upward and an annular bent cross-section (35) formed at the upper end thereof. ) From the lower part of the torso to the bent cross-section (35) of the torso of the auxiliary type (303), the inner peripheral surface of the inner rim (113) of the rim part (113) of the automobile wheel and the rim flange ( 13)
Matches the shape of

The shape of the outer rim forming mold formed at the upper end of the body of the second mold (302) is the outer rim (114) of the rim (11).
Has a shape that matches the inner peripheral surface of the rim and the rim flange (14). An annular wall is formed around the outer periphery of the rim flange molding.
(36) is provided. In the case of this embodiment, the forming roller
The vertical cross-sectional shape of the lower part of (2) coincides with the outer peripheral surface of the outer rim (114) and the inner surface of the rim flange (14), and the upper part thereof has the inner surface of the rim flange (13) and the inner rim ( 113) is set to match the shape of the tire seat part.

During the rotary forging, the first die (301) and the auxiliary die (3
03) is integrally driven up and down. And the rim part (11)
In the initial stage of molding the roller, the molding roller (2) is set at the position shown in FIG. Thereby, first, the rim flange (13)
An annular portion corresponding to (14) is formed above and below a boundary (27) between the cylindrical body of the molding roller (2) and the outer rim molding surface. After this,
The molding roller (2) is driven obliquely downward to the state shown in FIG. 16, and the first die (301) is driven down to rotate and forge while lowering the work (10). (2
By the gap surrounded by the lower part of 7) and the annular wall (36),
An outer rim (114) is formed. On the other hand, a cylindrical body is molded above the boundary (27).

Further, the work (10) by the first mold (301).
As the rolling of the projecting material progresses, the protruding material tends to separate into upper and lower parts of the boundary part (27), but the lower end of the gap below the boundary part (27) is formed by the annular wall (36) and the forming roller (2). Of the material below the boundary (27) is blocked, and flows only upward. As a result, the cylindrical body extends in the axial direction with the reduction, and its tip end is formed by a tapered surface (34) of an auxiliary mold (303) as shown by a broken line in FIG. It is pushed out and expanded in a tapered shape. Since the thickness at the tip of the tapered portion substantially matches the thickness set in the initial stage of the rotary forging, it is maintained equal to or greater than the thickness of the rim flange (13).

When the first mold (301) is pushed down to the final lowered position, the molding of the product-shaped disk portion (1) is completed between the first mold (301) and the second mold (302). Then, the molding of the rim flange (14) is completed. After this, the auxiliary type (3
03) with the downward movement of the first mold (30
While synchronously rotating the mold 1 and the second mold 302, the molding roller 2 is moved upward, and the cylindrical portion of the molding roller 2 and the bent cross-section (35) of the auxiliary mold 303 are moved. ), The tip of the cylindrical portion formed above the disk portion (1) is roll-formed, and the tire seat portion of the inner rim (113) and the rim flange are formed.
(13) are formed, whereby the entire molding of the rim portion (11) is completed.

In this embodiment, since the portions corresponding to the rim flanges (13) and (14) are formed thick in the initial stage of rotary forging (the stage shown in FIG. 15), the rim portion (11) is formed during forging. )
Also in the case of an automobile wheel in which the other portion is formed to be thin, there is an advantage that the rim flange portion can be formed to be thick. To execute the above series of operations, a control device using a microcomputer is used in the same manner as in the first embodiment.
(6) and the first and second molds (3
01) The rotation of (302), the lowering of the first mold (301), and the position of the molding roller (2) are controlled according to the product shape. The flowchart for this is substantially the same as that of the first embodiment, and will not be described.

In the first and second embodiments, the pulse encoder (500) for detecting the moving amount of the output shaft of the first hydraulic cylinder (55) is employed as the moving distance detecting means (501).
After the first mold (301) contacts the work (10), the first mold (3)
01) may be used as a detecting means for directly detecting the amount of descent movement. The relationship between the first mold (301) and the second mold (302) may be opposite to that of the above embodiment.

In the first embodiment, the first mold (3
01) is lowered by a first set value (Δα ₁ ) from the origin position and the position where the work (10) is lowered is defined as the initial forging end position. Then, after this, the work (10) by the first mold (301)
Each time the rolling dimension of the roller becomes the unit dimension Δα, the molding roller (2) is lowered by half. On the other hand, the first hydraulic cylinder (55) is maintained at the second set value from the origin position to the end of the rotary forging while maintaining the first hydraulic cylinder (55) at the second set value.
The reduction dimension of the work (10) by the mold (301) is the unit dimension Δα
A configuration may be adopted in which the molding roller (2) is lowered by half of each time it becomes.

The origin position detecting means (602) is a pressure detecting means.
(551) and a comparison means for comparing the detection output of the pressure detection means (551) with the third set pressure described above. The pressure detecting means (551) is inserted into the hydraulic circuit from the hydraulic source (550) to the first hydraulic cylinder (55) as shown by the broken line in FIG. 4, and the third set pressure is applied to the first mold (301). ) Is set higher than the first set pressure for lowering and is lower than the second set pressure for rotary forging.

When the first hydraulic cylinder (55) is driven at the first set pressure and the first mold (301) is lowered, the first mold (301) comes into contact with the work (10). Sometimes pressure sensing means (55
The detection pressure of 1) increases. When the detected pressure becomes higher than the third set pressure, the comparison means outputs an origin position detection signal. Further, the molding roller (2) is moved along the preset path from the initial position at the end of the initial forging, and the material protruding from the boundary between the first and second molds (301) and (302) is moved with respect to the material. It is also possible to push a part of the molding roller (2).

However, when the size of the material projecting from the boundary of the mold becomes large, it is difficult to perform the rotary forging by pushing the forming roller (2). Therefore, it is desirable to carry out this process at the initial stage of the rotary forging, and then to perform the rotary forging by simply moving the forming roller (2) up and down at a fixed position.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a conventional example for molding a rim portion (11) having a rectangular cross section.

FIG. 2 is an explanatory view of a conventional example for molding a rim portion having a V-shaped cross section in a horizontal direction.

FIG. 3 is an explanatory view of an intermediate stage of the molding.

FIG. 4 is an overall view of a first embodiment of the present invention.

FIG. 5 is a partial view of a flowchart of a control device (6) used for this;

FIG. 6

[Fig. 7] Forming roll (2) at the beginning of forming process by rotary forging
Diagram between the work and the work (10)

FIG. 8 is a diagram showing the relationship between the forming roll (2) and the work (10) during the forming process.

Fig. 9: Forming roll (2) and work in the final stage of the forming process
Relationship with (10)

FIG. 10 is an explanatory view in the middle of a molding step of Example 2.

FIG. 11 is an explanatory diagram of a final stage of a molding process according to the second embodiment.

FIG. 12 is an overall explanatory diagram of an apparatus according to a second embodiment.

FIG. 13 is an explanatory view of a supporting device (4).

FIG. 14 is an explanatory view of a main part of an apparatus according to a third embodiment.

[FIG. 15] A forming roll (2) and a work (10) during the forming process.
Relationship with

FIG. 16 is a diagram showing the relationship between the forming roll (2) and the work (10) when the outer rim forming is completed.

FIG. 17 shows a forming roll (2) and a work (1) before the end of the forming process.
(0)

FIG. 18 is a cross-sectional view of an automobile wheel in a molding completed state.

FIG. 19 is an explanatory diagram of a main part of a flowchart of a control device according to a second embodiment.

[Explanation of symbols]

 (301) ··· First mold (302) ··· Second mold (2) ··· Forming roller (10) ··· Work (1) ··· Disk part (11) ·・ ・ ・ Rim part (4) ・ ・ ・ ・ Support device (41) ・ ・ ・ ・ Vertical drive device (42) ・ ・ ・ ・ Horizontal drive device (5) ・ ・ ・ ・ Elevation drive device (601) ・ ・ ・Hydraulic pressure control means (602) ... Origin position detection means (501) ... Movement distance detection means (551) ... Pressure detection means (50) ...

Claims (8)

(57) [Claims] 1. A first mold (301) and a second mold (302), which rotate synchronously, are vertically opposed to each other, and a molding roller (2) is arranged on a side of a boundary between the first mold (301) and a second mold (302). The work (1) is placed between the mold (301) and the second mold (302).
A rotary forging device in which the work (10) is extended by forming the two dies relatively close to each other with the interposition of the rim (11) formed on the disk (1) and the outer periphery thereof. , The second mold (30
The first mold (301) is driven up and down with respect to 2), and the molding roller (2) is supported by a supporting device (4) so as to rotate freely and in an upright posture. An up-down drive device (41) for driving the support position of (2) in the up-down direction, and a horizontal drive device (42) for driving the support position of the molding roller (2) in the horizontal direction;
The mold (301) is configured to be driven up and down by a hydraulic lifting drive (5), and the drive pressure of the lift drive (5) is adjusted by moving the first mold (301) to the second mold (302) side. Hydraulic pressure control means (601) for switching between a first set pressure for moving to a second position and a second set pressure for rotary forging;
Origin position detecting means (602) for detecting an origin position where the first mold (301) is brought into contact with the work (10) by the first set pressure; and the hydraulic pressure control means (601). When the origin position detection signal is input from the origin position detecting means after the start of the elevation drive device (5), the drive pressure of the elevation drive device (5) is changed from the first set pressure to the second set pressure. A rotary forging device configured to switch. 2. The second mold (302) of the first mold (301).
Moving distance detecting means for detecting the moving distance to the side (501)
And the origin position detecting means (602) detects the distance from the moving distance detecting means (501) when the first mold (301) is moved toward the second mold (302) by the first set pressure. 2. The rotary forging device according to claim 1, wherein an origin position detection signal is output when the value of the rotation forging no longer changes. 3. An origin position detecting means (602) includes a pressure detecting means (551) for detecting a driving pressure of a hydraulic circuit to a lifting / lowering driving device (5), and a first mold (3) based on a first set pressure.
01) to the second mold (302) side, when the pressure detected by the pressure detecting means (551) reaches a third set pressure equal to or higher than the first set pressure and equal to or lower than the second set pressure. 2. The rotary forging apparatus according to claim 1, further comprising a comparison unit that outputs a position detection signal. 4. The second mold (302) of the first mold (301).
Moving distance detecting means for detecting the moving distance to the side (501)
And the origin position of the first mold (301) or the work (10)
Dimension reduction means (50) for calculating the dimension of reduction from the initial forging end position to the second mold (302) side based on the detection distance of the moving distance detection means (501), wherein A molding roller control device that outputs a horizontal movement start signal of the molding roller (2) and a vertical movement value of the molding roller (2) that is set in advance according to an output value from the pressing dimension calculating means (50). The vertical movement value from the molding roller control device is input to the vertical drive device (41), and the horizontal movement start signal is input to the horizontal drive device (42).
The rotary forging apparatus according to claim 1, wherein the input is input to the rotary forging apparatus. 5. A horizontal direction between a position at which the molding roller (2) is away from the second mold (302) and a position at which the molding roller (2) rotatably contacts the body of the second mold (302). The rotary forging device according to claim 4, wherein the rotary forging device is configured to move. 6. A second mold (302) of the first mold (301).
Moving distance detecting means for detecting the moving distance to the side (501)
And a molding roller control device that outputs a vertical movement value and a horizontal movement value of the molding roller (2) set in advance according to the output value from the rolling dimension calculation means (50). 2. The rotary forging device according to claim 1, wherein the vertical movement value from the controller is input to the vertical drive device (41) and the horizontal movement value is input to the horizontal drive device (42). 7. A molding roller, wherein the shape of the body of the first mold (301) and the shape of the body of the second mold (302) follow the shape of the inner peripheral surface of the rim (11). 7. The rotary forging device according to claim 6, wherein the body portion of (2) follows a part of the shape of the outer peripheral surface of the rim portion (11). 8. The shape of the body of the first mold (301) and the shape of the body of the second mold (302) have mutually symmetrical cross-sectional shapes, and are output from the molding roller control device. The vertical movement value of the forming roller (2) is calculated by a reduction dimension calculating means (50).
The rotary forging device according to claim 4, wherein the output value is set to 1/2 of the output value from the rotary forging.