JPH06154925A - Roll forming press - Google Patents

Abstract

PURPOSE:To prevent burning due to rotation stoppage of forming rollers by rotating forcedly the forming rollers held between a work and a die ring. CONSTITUTION:The plural forming rollers 7 guided by roller supports 9 are provided movable vertically and rotatably in the die ring 4. A pinion 12 is provided integrally on the side of each forming roller 7 and this pinion 12 is engaged with a rack part 14 at the roller support 9 side. The forming rollers 7 held between the work W and the die ring 4 are rotated forcedly by engagement of the pinions 12 with the rack part 14 in accordance with lowering of the die ring 4. Consequently, rotations of the forming rollers 7 are not stopped during forming, the forming rollers stably roll and come into contact with the work W till forming is completed and burning during forming can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press working apparatus for forming a gear-shaped portion such as a spline by roll forming.

[0002]

2. Description of the Related Art As a press working apparatus for forming a spline by a roll forming method, an actual press machine 54-893 is used.
Some are disclosed in Japanese Patent Publication No. 39.

This conventional press working apparatus, as shown in FIG. 3, has a die ring 54 that moves up and down with respect to a punch 53 supported by a punch holder 51 via a knock pin 52.
In addition, two types of rolls 55 and 56 of large and small size corresponding to the troughs of the spline to be formed are radially provided, and the rolls 55 and 56 are rotatably supported via shaft members 57 and 58. .

Since an outer spline is formed on the outer circumference of the punch 53, the punch 53 is covered with a cup-shaped work W, and the die W is held while the work W is restrained by the pad 59. Lower it. With the lowering of the die ring 54, the rolls 55 and 56 rotate and move downward while making contact with the outer peripheral surface of the work W, so that the outer periphery of the work W corresponds to the outer spline on the punch 53 side. Splines will be formed. The pad 59 is biased downward by an elastic body 60.

[0005]

In the conventional press working apparatus as described above, a plurality of rolls 55 and 56 are brought into rolling contact with the work W while the working reaction force is directly exerted on the shaft members 57 and 58. Since the rolls 55 and 56 are brought into contact with the inner lower surface of the die ring 54 or the inner peripheral surface of the pressing plate 61 at the points P ₁ and P ₂ so that they do not act on the The rotation of the rolls 55, 56 may be temporarily stopped depending on the resistance of the rolls 55, 56, and the rolls 55, 56 always roll stably with respect to the work W from the start of the forming to the completion of the forming. There is no guarantee that you are in contact.

Therefore, once the rotation of the rolls 55, 56 is once stopped, the rolling contact makes a complete turn to form what is called an ironing process, and seizure easily occurs, and the durability of the rolls 55, 56 deteriorates. Further, in order to prevent such seizure, a large amount of lubricating oil must always be supplied, which requires contamination countermeasures and deteriorates the working environment, which is not preferable in practice.

The present invention has been made in view of the above problems, and an object of the present invention is to ensure that the forming roller always comes into rolling contact with the work, and to prevent seizure while lubricating. It is to provide a structure that does not require oil.

[0008]

SUMMARY OF THE INVENTION A roll forming press working apparatus according to the present invention comprises an external gear-shaped punch on which a toothed portion is formed on an outer peripheral surface and a work to be processed is mounted, and the punch and the punch are concentric with each other. And a die ring that is movable in the axial direction relative to the punch, and is radially arranged on the inner periphery of the die ring so that the outer peripheral portion faces the valley of the tooth profile portion of the punch. And a plurality of forming rollers that are movable and rotatable in the axial direction of the die ring and roll while being sandwiched between the work and the inner peripheral surface of the die ring, and the side of the forming roller. And a pinion that is integrally formed with the molding part and has a smaller diameter than that of the molding roller, and that meshes with the rack part on the inner circumference of the die ring.

[0009]

According to this structure, although the plurality of forming rollers provided inside the die ring are movable and rotatable in the axial direction of the die ring, the pinion integral with the forming roller is located on the die ring side. It meshes with the rack.

Therefore, the forming roller sandwiched between the work and the die ring is forcedly rotated due to the meshing of the pinion and the rack portion with the displacement of the die ring, and in the same direction as the die ring. While moving, the work is shaped like a gear.

[0011]

1 and 2 are structural explanatory views showing an embodiment of the present invention, in which a punch 2 is fixed on a lower holder 1, and the outer periphery of the punch 2 has a shape of a gear to be formed. Corresponding to the tooth profile 2a is formed. Then, the punch 2 is covered with a cup-shaped work W to be processed.

On the other hand, a ring die 4 is fixed to an upper holder 3 fixed to a press ram (slide) (not shown) which moves up and down with respect to the lower holder 1. A pad 6 biased downward by an elastic body 5 is supported on the die ring 4 so as to be vertically movable. The pad 6 serves to press the work W when the upper holder 3 is lowered.

On the inner circumference of the die ring 4, a plurality of molding rollers 7, 7 ... Are radially provided along the circumferential direction. More specifically, on the inner circumference of the die ring 4, a plurality of spacer blocks 8, 8 ... And roller supports 9, 9 ... Having a substantially U-shaped cross section are alternately and radially arranged along the inner circumference of the die ring 4. Are fixed to the die ring 4 by bolts 10, while the roller supports 9, 9 ... Are fixedly held by the pressing plate 11.

Between the adjacent spacer blocks 8 and 8, a disk-shaped forming roller 7 together with a roller support 9 is provided.
Are individually provided so as to be vertically movable and rotatable.
The forming rollers 7, 7 ... Are positionally regulated by the guide portions 8a, 8a of the spacer blocks 8, 8 on both sides thereof, and the outer peripheral portions of the forming rollers 7, 7 ,.
It projects to the punch 2 side more than 8 ... When the molding rollers 7, 7 ... Are sandwiched between the work W and the die ring 4, the outer peripheral portion of the molding rollers 7, 7 ...
A guide surface 9a on the side of the roller supports 9, 9 ...
It is designed to be pressed against.

A pinion 12 having a diameter smaller than that of the forming rollers 7, 7 ... Is provided on both sides of the forming rollers 7, 7.
A rack portion 14 that meshes with the pinion 13 is formed on the side of the roller supports 9, 9 ... Then, when the die ring 4 is lifted away from the punch 2, the forming rollers 7, 7, ...
It descends to the position where it touches.

In the press working apparatus constructed as described above, the work W placed on the punch 2 is pushed by the pad 6 descending together with the upper holder 3 and is punched by the punch 2.
While being pressed and restrained between them and the upper holder 3, they are roll-formed by the forming rollers 7, 7 ...

That is, even if the upper holder 3 is lowered,
The forming rollers 7, 7 are pressed in the die ring 4 until the forming rollers 7, 7 ... Contact the work W.
It is stationary at the position where it comes into contact with. On the other hand, the upper holder 3
When the forming rollers 7, 7 ... Contact the work W as they descend, the forming rollers 7, 7 ... Are caught between the work W and the guide surfaces 9a of the roller supports 9, 9 ,. The outer peripheral surface of W comes into contact with each other, and the portion corresponding to the valley portion of the tooth profile to be molded is lowered while being pressed, and the work W is molded into a gear shape.

At this time, the forming rollers 7, 7 ... Form such that they are locked between the work W and the guide surface 9a of the roller supports 9, 9 ... , The pinion 12 on the side of each molding roller 7, 7 ... and the rack portion 14 on the side of the roller support 9, 9 ... mesh with each other, so that each molding roller 7, 7 ... Is forcedly rotated as the die ring 4 descends. The rotation of the forming rollers 7, 7 ... Does not stop during the forming process, and keeps rolling contact with the workpiece W stably until the forming is completed. And
The processing reaction force of the forming rollers 7, 7 ...
The die ring 4 bears through the roller supports 9, 9 ...

On the other hand, when the upper holder 3 descends to the bottom dead center position and then starts to rise again, the forming rollers 7, 7
... returns to its original position while rotating in the opposite direction.

[0020]

As described above, according to the present invention, the forming roller sandwiched between the work and the die ring is provided on the rack side on the die ring side and the forming roller side as the die ring moves. Since it is forcedly rotated by meshing with the pinion, the rotation of the molding roller does not stop during molding, and the molding roller will continue to be in point-to-point contact with the work stably until the completion of molding. Therefore,
There is no need for ironing due to the rotation stop of the forming roller unlike in the past, it is possible to prevent seizure during forming, improve the durability of the forming roller, and do not need to supply lubricating oil. Therefore, the moldability and workability can be improved.

[Brief description of drawings]

1A and 1B are views showing an embodiment of the present invention, in which FIG. 1A is an enlarged view of a main part of FIG. 2, and FIG. 1B is a view taken along the line bb of FIG.

FIG. 2 is an explanatory diagram of the overall configuration of an apparatus showing an embodiment of the present invention.

FIG. 3 is a sectional view of an essential part showing an example of a conventional press working apparatus.

[Explanation of symbols]

 2 ... Punch 2a ... Tooth shape part 4 ... Die ring 7 ... Forming roller 8 ... Spacer block 9 ... Roller support 12 ... Pinion 14 ... Rack part W ... Work

Claims (1)

[Claims] 1. A roll forming press machine for forming a work into a gear shape by performing multi-row roll forming on the outer peripheral surface of a hollow cylindrical work along the axial direction thereof, wherein a tooth profile is provided on the outer peripheral surface. An external gear-shaped punch on which a work to be processed is formed, a die ring which is arranged concentrically with the punch and is movable relative to the punch in the axial direction, and an outer peripheral portion While being radially arranged on the inner circumference of the die ring so as to face the valley of the tooth profile of the punch, the die and the ring are movable and rotatable in the axial direction of the die ring. A plurality of forming rollers that roll while being sandwiched between the inner peripheral surface and a forming roller that is integrally provided on a side portion of the forming roller and has a smaller diameter than the forming roller, and that is a rack portion on the inner periphery of the die ring Pini that meshes with Down, Miyako roll forming a press working apparatus characterized by comprising a.