JPH0253133B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a roll device for forming pipes, which performs bulge processing, spool processing, or other roll processing on metal pipes.

[Prior art] This type of conventional device has a core metal (inner mold) coaxially attached to the output shaft of a rotary drive mechanism, and a roller outer mold attached to a rotating shaft parallel to the central axis of the core metal. A mold, a mechanism for reciprocating the rotating shaft in the direction of the core metal while keeping it parallel to the center axis of the core metal, and a pipe-shaped workpiece inserted onto the core metal and pressed toward the base of the core metal. It consists of a workpiece pressing mechanism that prevents the workpiece from coming off.

[Problems to be Solved by the Invention] Since the conventional roll device for forming pipes has the above-mentioned configuration, it is difficult to roll the pipe-shaped workpiece at the rear end of the core metal during any type of roll processing. It is necessary to press the workpiece in the direction and hold it, and the above-mentioned workpiece pressing mechanism is in charge of this action. This puts unnecessary pressure on the end of the workpiece, so
The workpiece was easily deformed, making it difficult to process with high precision.

[Means for Solving the Problems] The gist of the configuration of the present invention is as follows: A core metal, which is an inner mold for molding, is attached to the output part of a rotational drive mechanism, and a core metal that moves forward and backward from the side of the core metal. In a forming roll device consisting of a roller type whose circumferential side is pressed against the circumferential side of the core metal and separated from the core metal by pressing the circumferential side of the core metal, the roller type is fitted onto the inner end of the core metal as a positioning means. A stopper part is provided with which the end of the pipe to be processed comes into contact, and the roller mold is rotatably attached to a support shaft, and the peripheral side of the roller mold is in contact with the outer periphery of the pipe inserted into the core metal. When this occurs, the support shaft is aligned with respect to the central axis of rotation of the cored metal so as to generate a minimum force acting on the pipes in the direction of the stopper to prevent them from separating from the stopper. This is a roll device for forming pipes, characterized in that the angle can be set so that the side located on the tip side of the core bar approaches.

As the rotational drive mechanism, an electric motor or other actuator can be freely employed.
The magnitude of the output may be determined depending on the pipe-shaped workpiece to be processed. It is preferable that the rotation speed and the like can be easily controlled.

The rotational drive mechanism is placed on a suitable pedestal.

The support shaft is attached, for example, to a bracket of a carriage. The reciprocating table has a rail arranged on the pedestal, and is movably arranged on the rail.

For example, the bracket is attached to the carriage,
It is erected on a turntable that is rotatably and fixably arranged. That is, by rotating the turntable by an appropriate angle as necessary, the angle of the bracket is changed, and thus the angle of the support shaft with respect to the core metal is changed, and the support shaft is aligned with the tip side of the support shaft with respect to the core metal. The distance between the base and the base can be made narrower than the distance between the base and the base.

Further, the movement of the reciprocating carriage toward the core bar from the side can be configured by, for example, a hydraulic mechanism. Specifically, the bottom of the double-acting hydraulic cylinder is pin-coupled to a part of the pedestal, and the tip of the rod is connected to the carriage. In this way, the above shuttle
It moves forward and backward along the rail according to the expansion and contraction of the double-acting hydraulic cylinder.

A hydraulic pressure generating mechanism is connected to the double-acting hydraulic cylinder for supplying pressure oil to its front end and rear end at appropriate intervals.

It should be noted that the movement mechanism of the above-mentioned carriage can also be constructed by a rack and pinion. Not limited to specific configurations.

Further, the core metal is configured to protrude from the end face of the cylindrical base body, and the end face is used as the stopper surface against which the tip of the pipe-like workpiece comes into contact for positioning.

The core metal is naturally formed into a circumferential shape for bulge processing, spool processing, or other appropriate forming. At this time, for parts not involved in molding,
It is preferable to use a pipe-like workpiece to make the diameter slightly smaller.

The roller type has a circumferential side formed in a shape corresponding to the circumferential shape of the core metal.

[Function] Since the present invention is configured as described above, it can be easily used for rolling a pipe-shaped workpiece as follows.

First, the pipe-shaped workpiece is prepared for bulge processing, spool processing, and other roll forming processing to be performed. First, a core metal having a circumferential shape corresponding to the applicable roll processing is coaxially connected and fixed to a rotating part of a rotational drive mechanism using a cylindrical base.

Further, a roller mold having a circumferential shape corresponding to the circumferential shape of the core metal is rotatably attached to the support shaft.

Next, the angle of the support shaft is adjusted, and the support shaft is tilted at an appropriate angle with respect to the center axis of the core metal so that the distance between it and the tip side is narrower than the distance between it and the cylindrical base body. This perspective view of the support shaft means that when it is attached to a bracket provided upright on the turntable described above, the turntable is rotated to adjust the angle of the support shaft with respect to the core metal. Then, fix the turntable at an appropriate angle. The rotation angle of the turntable, that is, the rotation angle of the support shaft, is also the rotation angle of the roller type, and this was determined by actually performing experimental roll processing as described later. The dimensions and shape of the product are inspected and finalized.

After preparing in this manner, the roll device for forming the pipes is operated.

That is, the rotary drive mechanism is rotationally driven to move the carriage back and forth.

Thus, the roller type moves back and forth in the direction of the core metal as the carriage moves back and forth. Therefore, first, while the roller mold is retracting, a pipe-shaped workpiece is manually or automatically supplied to the cored metal in an extrapolated state. In either manual or automatic operation, as will be described later, it is necessary to lightly support the pipe-shaped work to hold it on the core metal until the roller mold advances and comes into contact with it.

While the pipe-shaped workpiece is being held on the core metal as described above, the roller mold approaches, and first, the portion of the core metal located on the tip side comes into contact with the pipe-shaped workpiece. Due to such roller-type contact, a slight acting force is applied to the pipe-shaped workpiece that advances toward the cylindrical base side of the core bar, that is, toward the stopper portion that is the end face of the pipe-shaped workpiece, and the pipe-shaped workpiece can be held manually or automatically as described above. Even if it is untied, its tip remains in contact with the stopper. Subsequently, the roller mold advances and comes into pressure contact with the pipe-shaped workpiece, and roll forming processing is performed. The rotational driving force is applied from the core metal side, and this is transmitted to the roller type through the pipe-shaped workpiece that is extrapolated to the core metal.
Roll forming is performed together with the core metal while rotating in the opposite direction.

After the roll processing is completed, the roller mold retreats, and during this time, the formed pipe body is manually or automatically removed from the core metal, and the next pipe-shaped workpiece is again inserted onto the core metal. After this, the procedure described above is repeated again. By repeating this process, continuous roll forming is performed.

Therefore, as mentioned above, even though there is no means for pressing the pipe-shaped workpiece from its rear end to the cylindrical base side, that is, to the stopper part side, the tip of the pipe-shaped workpiece remains unchanged from the start to the completion of roll forming. Since it lightly and reliably contacts the stopper portion, accurate roll forming can be performed.

Conversely, as mentioned above, since no pressing operation is applied from the rear end of the pipe-shaped work, no unnecessary external force is applied to the rear end, and as a result, unnecessary deformation may occur at the front and rear ends. do not have. Therefore, highly accurate roll forming can be performed without the need for reprocessing or the like.

[Example] An example of the present invention will be described below based on the drawings.

First, an example of a configuration for bulge processing will be shown. That is, this is a configuration example for enlarging and molding the end portion of a pipe, which is a workpiece, into a predetermined shape.

As shown in FIGS. 1 and 2, a core metal 1 is configured to protrude from a base body 2. The base body 2 has a large diameter cylindrical portion 2a.
and a small-diameter cylindrical portion 2b formed at the end thereof, and the core bar 1 is provided protruding from the end face of the small-diameter cylindrical portion 2b on its axial extension.

In order to carry out a predetermined bulging process, the core metal 1 has a shape corresponding to the corresponding enlarged shape at the connecting end side to the small diameter cylindrical part 2b of the base body 2, as shown in FIGS. 1 and 2. The tip end side is formed into a cylindrical shape with a slightly smaller diameter than this part.

Note that the end face of the small diameter cylindrical portion 2b is connected to the core bar 1.
When the pipe p, which is a workpiece, is extrapolated to , this becomes the stop surface s that determines the tip position.

The base body 2 is connected to the output shaft of the speed reducer 3 at its large diameter cylindrical portion 2a side. Reducer 3 is electric motor 4
is connected to.

Note that the electric motor 4 and the reducer 3 connected thereto are installed on a pedestal 5.

As shown in FIG.
A slider 7 is movably arranged on this rail 6. A double-acting cylinder device 8 is connected to the slider 7 for moving the slider back and forth along the rail 6. Specifically, the bottom of the double-acting cylinder device 8 is rotatably pin-coupled to a part of the pedestal 5, and the tip of the rod is rotatably pin-coupled to the slider 7. Moreover, this double-acting cylinder device 8 includes
A hydraulic pressure generating device is connected to supply pressure oil to expand and contract this at a predetermined period.

Further, a turntable 9 is rotatably arranged on the slider 7. Tightening screws 10, 10 are screwed into the slider 7 from its sides, and by tightening these screws 10, 10, the turntable 9 can be fixed to prevent rotation. A bracket 11 is erected on the turntable 9, a support shaft 12 is arranged on the bracket 11, and a roller mold 13 is rotatably attached to the support shaft 12.

The roller mold 13 is formed in a circumferential shape corresponding to the core metal 1, as shown in FIGS. 1 to 3.

In this example, since the configuration is as described above,
It can be used as follows.

First, the angle of the support shaft 12 is adjusted, and as shown in FIG. Tilt it at an appropriate angle. The angle of this roller mold 13 is adjusted by rotating the turntable 9. Temporarily fix the turntable 9 at an appropriate rotation angle and test the device.
Execute the bulge processing process described later to find the optimal inclination angle and fix it definitively. The turntable 9 is fixed by tightening the tightening screws 10, 10.

After the setup is completed in this way, the roll device for forming pipes is driven in earnest.

Then, the roller type 13 starts repeating its forward and backward movements in accordance with the forward and backward movements of the slider 7 due to the action of the double-acting cylinder device 8 .

Therefore, while the roller mold 13 is retracting, the pipe p, which is a workpiece, is manually supplied to the core metal 1 in an extrapolated state. The core metal 1 is rotated by an electric motor 4, and the pipe p is also rotated at the same time. In the meantime, the roller mold 13 approaches, and in particular, as shown in FIGS. 2 and 3, the large diameter portion 14 of the roller mold 13 is first attached to the tip side of the core metal 1. The stepped corner portion 15 on the side where the base body 2 is located
It will make contact before the other side. As a result, an acting force is generated in the pipe p in the direction of the base body 2 of the core metal 1. Thus, at this point, let go of pipe p.

Subsequently, the roller mold 13 advances due to the action of the double-acting cylinder device 8, presses against the pipe p, and maintains the pressure contact state for a certain period of time. During this period, the roller mold 13 moves as the core bar 1 rotates. , performs bulge forming together with the core metal 1 while rotating in the opposite direction.

In this way, the tip of the pipe p is reliably connected to the small diameter cylindrical portion 2b from the start to the completion of roll forming.
As a result, the bulge is in contact with the stopper surface s of the end face of the bulge, and accurate bulge forming can be performed.

Also, since there is no mechanical pressing operation from the rear end of the pipe p to the stopper surface s side, the pipe p
Bulge forming can be performed with high accuracy without causing unnecessary deformation.

After completing the above bulge forming process, the roller mold 1
3 is retracted by the action of the double-acting cylinder device 8, during which time the formed pipe p is manually removed from the core metal 1, and the next pipe p is extrapolated onto the core metal 1 again. After this, the procedure described above is repeated again. By repeating this process, a continuous bulge forming process is performed.

[Effects of the Invention] According to the present invention, during roll forming, the inner end of the pipe-like workpiece can be pressed against the stopper portion without providing a pressing means for pressing the pipe-shaped workpiece from the outer end toward the stopper portion. Accurately abuts and is accurately held on the core metal. That is, the angle of the roller mold that presses against the outer periphery of the pipe-shaped workpiece is, as described above,
It can be tilted slightly and appropriately, and when it is tilted in this way, it is possible to apply a slight acting force in the direction of the stopper part to the pipe-shaped workpiece during roll forming, so that the pipe-shaped workpiece can be tilted slightly and appropriately. The inner end lightly contacts the stopper part and is accurately held on the core bar.

Therefore, roll forming can be performed without applying unnecessary external force to the inner and outer ends of the pipe-shaped workpiece, so there is no unnecessary deformation of the shape, and of course the dimensions remain accurate, allowing highly accurate forming. .

Therefore, there is no need to rework the end portions to ensure accuracy.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention.
The figure is an explanatory plan view, Fig. 2 is an enlarged explanatory view showing the state in which the roller mold approaches the pipe inserted into the core metal and has started contact, and Fig. 3 shows the relationship between the roller mold and the pipe in Fig. 2. FIG. 3 is an enlarged partial view showing a contact start state of FIG. DESCRIPTION OF SYMBOLS 1...Core metal, 2...Base body, 2a...Large diameter cylindrical part, 2b...Small diameter cylindrical part, 3...Reducer, 4...
Electric motor, 5... Frame, 6... Rail, 7...
Slider, 8... Double acting cylinder device, 9... Turntable, 10... Tightening screw, 11... Bracket, 12... Support shaft, 13... Roller type, 1
4... Large diameter portion, 15... Step corner, p... Pipe, s... Stopper surface.

Claims (1)

[Scope of Claims] 1. A core metal, which is an inner mold for molding, attached to the output part of the rotational drive mechanism, and a peripheral side pressed against the peripheral side of the core metal by moving forward and backward from the side of the core metal. In a forming roll device consisting of a roller type and a roller type that separates from each other, a stopper part is provided as a positioning means on the inner end of the core metal, and the end of the pipe to be processed that is inserted into the core metal comes into contact with the inner end of the core metal. The roller mold is rotatably mounted on a support shaft, and when the circumferential side of the roller mold comes into contact with the outer periphery of the pipes inserted into the core metal, the pipes are provided with a pressure from the stopper part. The support shaft is arranged such that the side located on the tip side of the core metal approaches the rotation center axis of the core metal so as to generate a minimum acting force in the direction of the stopper part to prevent separation. A roll device for forming pipes, characterized in that the angle can be set.