KR100427695B1 - Apparatus and method for rolling of rod - Google Patents

Abstract

The present invention relates to a rolling mill and a rolling process for rolling by rolling a circular cross-section pipe to a rolling roller group, wherein the rolling surface contour of the rolling roller is different for each rolling roller, and the rolling surface of each rolling roller is axially oriented. By processing differently, the processing force of each rolling roller can be reduced, the total pressure applied to the pipe by the rolling roller group can be reduced, and the rolling can be performed while the stress applied to the pipe is reduced.

Further, rolling can be carried out while the cross section of the thin pipe is not deformed.

Description

Roll processing equipment and rolling process {Apparatus and method for rolling of rod}

The present invention relates to a roll processing apparatus and a roll processing method for rolling by rolling a circular cross-section pipe to a roll roller group.

In general, when the grooves and beads, etc., which extend in the circumferential direction are formed by plastic working on the end lamps of the gas pipes connecting the gas hoses, the roll forming technology using a roll roller group is widely used.

The rolling mill is provided with a plurality of rolling roller groups, torque generating means for rolling each rolling roller around the pipe, and pressurizing generating means for forcing the rolling roller group to the pipe.

The roll roller groups are pressed against the pipe outer circumference by bringing the plurality of roll roller groups into contact with the pipe outer circumference at a plurality of positions separated in the circumferential direction of the pipe, and approaching the distance between the rotation centers of the roll roller groups by the pressing force generating means The rolling roller group is rolled around the pipe by the torque generating means.

In order to roll the metal pipe, it is necessary to press the rolling roller group to the pipe with a large processing force. Usually, the rolling roller group is pressed into the pipe by using a hydraulic cylinder that obtains a large pressing force.

Moreover, the conventional rolling mill is provided with the restraint mechanism which crimps a pipe end and maintains a pipe center position in a fixed position.

If the thickness of the pipe is thick, it can be rolled without any problems with the apparatus and method.

However, in the case of rolling on thin pipes, the pipe cross section is irregularly deformed, so that the intended rolling can not be done.If the pressing force required for rolling is applied to the rolling roller group, the thin pipe thickness is irregular before rolling. It is done.

For example, when rolling the steel pipe having a thickness of 1 mm or less, the cross section is deformed into a pentagon or an ellipse is frequently generated.

Accordingly, the present invention has been made to solve the above problems, and an object of the present invention is to realize a rolling processing device and a rolling processing method that can be rolled without causing deformation in the cross-sectional shape of a thin circular cross-section pipe. .

1 is a main portion side view showing a state before processing of a rolling roller and a pipe in one embodiment of the present invention rolling mill and rolling process.

Figure 2 is a side view showing the main part of the present invention the rolling mill and the rolling mill method in the embodiment of the rolling roller and the pipe during and at the end of the processing.

Figure 3 is a side view showing the main part of the present invention the rolling mill and the rolling mill in the embodiment of the rolling roller and the pipe during processing and at the end of the process

Figure 4 is a main part side view showing a pipe rolling process by the rolling roller (10) in the present rolling mill and rolling method.

Figure 5 is a main part side view showing a pipe rolling process by the rolling roller 12 in the present rolling mill and rolling method.

Figure 6 is a side view showing the main part of the present invention, the rolling process of the pipe rolling process by the rolling roller 14 in the rolling mill and rolling method.

7 is a partially enlarged view showing the frame 16 and the pressurized pipe 16 of the roll roller 10 in the roll processing apparatus and the roll processing method of the present invention.

8 is a partially enlarged view showing the frame 16 and the pressurized pipe 16 of the roll roller 12 in the roll processing apparatus and the roll processing method of the present invention.

9 is a partially enlarged view showing the edge portion of the rolling roller 14 and the pipe 16 pressurized in the rolling mill and rolling method of the present invention.

10 is a side view showing a pressing force generating means of the apparatus.

Fig. 11 is a partial sectional view showing the tube end portion of the apparatus.

<Description of Signs of Major Parts of Drawings>

10,12,14; Rolling rollers 16; pipe

18; Rotary drive shaft 20; Lever fixed shaft

22; Air cylinder fixed shaft 24; Air cylinder

26; Link fixed shaft 28; Link mechanism

30; Lever 32; stopper

40; Tube end 42; Thrust bearing part

44; Roller bearing 46; Oil free storage department

48; spring

The rolling apparatus of the present invention includes at least two rolling roller groups, torque generating means for rolling each rolling roller around the pipe, and pressing force generating means for approaching the distance between the rotation centers of the rolling roller groups, in particular rolling of rolling roller groups. It is characterized in that the surface contour is different for each roll roller.

There are various types of forms of rolling each roll roller around a pipe.

For example, FIG. 3A illustrates a form in which the pipe 16 and the rolling rollers 10 and 12 are driven to rotate by rotating the rolling rollers 14.

In this case, since the pipe 16 rotates, when the pipe 16 is fixed, each rolling roller 10, 12, 14 rotates and revolves around the pipe 16 while rotating.

Each rolling roller 10, 12, 14 does not slip with respect to the pipe 16. As shown in FIG.

The rolling of the rolling roller without slipping against the pipe and revolving while rotating is referred to as electric rolling around the pipe in this specification.

3B illustrates a case in which the rolled roller groups 10, 12, 14 are driven by rotating the pipe 16.

3C illustrates a case in which the respective roll rollers 10, 12, 14 and the pipe 16 are driven to rotate by rotating the center of rotation of the roll roller group around the pipe.

In any case, the rolling roller revolves around the pipe while rotating without slipping against the pipe.

Torque generating means for rolling each rolling roller around a pipe includes various forms.

By varying the rolling surface profile of the rolling roller group for each rolling roller, the contact length of each rolling roller with the pipe can be shortened.

For example, in the case of rolling processing in the range of 30mm in the axial direction using three rolling rollers, if the length of 10mm is processed in each roller, the processing of 30mm as a whole becomes possible.

As a result, the force that each roll roller presses on the pipe may be less than in the case of roll-rolling by a length of 30 mm on each roller.

According to the rolling mill of the present invention, the pressing force of each rolling roller can be reduced, the total pressing force applied to the pipe by the rolling roller group can also be reduced, and rolling can be performed while reducing the stress applied to the pipe.

This can be rolled while avoiding deformation of the thin pipe section.

In the rolling method of the present invention, at least two rolling roller groups are rolled to the pipe at two or more locations separated in the circumferential direction of the pipe of the circular cross section.

At this time, the rolling surface for each rolling roller is changed while making it axially different.

According to this method, it is possible to carry out rolling processing while the pressing force of the individual rolling rollers is made small and the total pressing force applied to the pipe by the rolling roller group is also small.

In another method of the present invention, at least three roll roller groups are rolled by rolling the pipe at three or more points separated in the circumferential direction of the pipe of the circular cross section.

At this time, the rolling surface of each rolling roller is changed in the axial direction and processed without restraining the pipe center position.

According to this processing method, the center of the pipe can be processed in a floating state, and the pressing force of the individual rolling rollers can be reduced without applying excessive force to the pipe, and the roll processing can be carried out on the thin pipe.

In addition, by this processing method, it is not necessary to equalize the pipe indentation amount for each surface roller, so that the structure of the pressing force generating means can be simplified.

Allowing fluctuations in the center position of the pipe during processing can simplify the structure of the rolling mill.

Preferred embodiments of the present invention will be described with reference to Figs.

1 to 2 are main side views showing a roll roller group and a pipe processed in the roll roller group according to the present embodiment, and Fig. 1 shows before processing. .

As shown in FIG. 1, the three rolling rollers 10, 12, 14 and the pipe 16 have rolling roller groups 10, 12, 14 surrounding the outer circumferential surface of the pipe 16 in the circumferential direction. The rolling roller 14 is provided with torque generating means (not shown), and rotates in the direction of the arrow.

The rolling rollers 10, 12 are driven in rotation, the pipe 16 is supported by rotation, and its position is constrained only by the rolling rollers 10, 12, 14 without constraining the pipe center. .

As shown in FIG. 2, in the rolling process, the center of rotation of the rolling rollers 10 and 12 approaches toward the center of rotation of the rolling rollers 14.

As a result, the rolling rollers 10, 12, 14 are pressed into three positions separated in the circumferential direction of the pipe 16 in the pipe center direction with respect to the pipe outer circumferential surface.

When the rolling rollers 14 rotate with the rolling roller groups 10, 12 and 14 pressed against the center of the pipe 16 on the outer circumference of the pipe 16, the pipe 16 is driven in the direction of the arrow. Then, the rolling rollers 10 and 12 rotate in the direction of the arrow, respectively.

Therefore, the torque generating device for rotating the rolling roller 14 is the rolling roller group (10, 12)

14 is rolled around the pipe 16.

FIG. 3 shows various forms in which the roll roller groups 10, 12, 14 are rolled around the pipe 16.

White arrows in Figs. 3A, 3B, and 3C show rotations by the torque generating means, and solid arrows indicate driven rotations.

3 (a) shows the rolling mill factory values described in FIGS. 1 and 2, and the torque generating means (not shown) for rotating the rolling roller 14 as described above is the rolling roller group 10 (12). 14 is rolled around the pipe 16.

In the example shown in FIG. 3B, torque generating means (not shown) are provided in the pipe 16.

The rolling roller groups 10, 12 and 14 are pressed down and rotated from the outer circumference of the pipe 16 toward the center of the pipe 16. As shown in FIG.

In this state, when the pipe 16 rotates in the direction of the arrow by the torque generating means, the rolling rollers 10, 12, 14 follow each other in the direction of the arrow.

In this example, the means for rotating the pipes roll the roll roller groups 10, 12, 14 around the pipe 16.

In the example shown in (c) of FIG. 3, the pipe 16 is constrained to be non-rotating, and the center of rotation of the three rolling rollers 10, 12, 14 is connected to the pipe by the torque generating means (not shown). 16) Rotate around the center.

The rolling roller groups 10, 12, 14 are pushed toward the center of the pipe 16 on the outer circumference of the pipe 16, and are rotated around the center of rotation.

In this state, when the center of rotation of the rolling rollers 10, 12, 14 is rotated around the center of the pipe 16 by the torque generating means, the rolling roller groups 10, 12, 14 are connected to the pipe ( 16) Orbit around the white background arrow.

At this time, the rolling roller group rotates without slipping while contacting the fixed pipe 16, so that each rolling roller rotates in the direction of the solid arrow, respectively.

In the three kinds of transmission examples shown in Fig. 3, the rotating bodies directly rotated by the torque generating means are different, respectively, but as a result, each rolling roller rotates relatively around the pipe while rotating.

Moreover, the roll roller group does not slip against the pipe at the site of contact with the pipe 16.

There is no restriction in the transmission mode usable in the present invention.

4 to 6 show the rolling process of the pipe 16 by the three rolling rollers 10, 12 and 14, and FIG. 4 shows the progress of rolling by the rolling roller 10. As shown in FIG. 5 shows the progress of rolling by the rolling roller 12, and FIG. 6 shows the progress of rolling by the rolling roller 14. As shown in FIG.

(A) of FIG. 4-FIG. 6 shows the state before a process, (b) is a process, and (c) is a process completion.

7 to 9 are enlarged views of the projections of the respective rolling rollers of Figs. 4 to 6 and the pipe 16 pressurized by them, Fig. 7 is Fig. 4 and Fig. 8 is Fig. 5 and Fig. 9 corresponds to FIG. 6, respectively.

The hatches in Figs. 7 to 9 show regions on the pipe rolled by the respective rolling rollers.

As described above, the three roll rollers are positioned to surround the outer circumferential surface of the pipe 16 in the circumferential direction.

As shown in Figs. 4 to 6, the three rolling rollers have different rolling surface contours.

The term "rolling surface contour" as used herein pushes the cross-sectional shape of the rolling roller shown in (a) of FIGS. 4 to 6, and precisely at the position along the rotational center axis and at the position in the section including the rotational center axis of the rolling roller. Refers to a two-dimensional curve determined by the roller radius.

As shown in Figs. 4 to 6 (a), the rolling surface contours of the respective rolling rollers are all formed differently.

As shown in Fig. 9, the rolling roller 14 has a rolling surface profile in which the roller radius changes abruptly with respect to the position along the central axis of rotation.

As shown in FIG. 7, the roll roller 10 has a roll surface profile in which the roller radius changes smoothly with respect to the position along the rotational center axis.

As shown in Fig. 8, the rolling roller 12 has an intermediate rolling surface contour.

At the time of rolling, the rolling roller 14 rolls the shape near the bone of the pipe 16, as shown in FIG.

As shown in FIG. 7, the rolling roller 10 rolls the shape of the vicinity of the peak of the protrusion rolled to the pipe 16. As shown in FIG.

As shown in FIG. 8, the rolling roller 12 rolls the intermediate region of the rolling area by the rolling roller 14 and the rolling area by the rolling roller 10. As shown in FIG.

The machining area by each rolling roller is shifted from the rotational center axis direction.

Thus, since the rolling surface of the pipe 16 is disperse | distributed and pressurized by three rolling rollers, the contact area of each rolling roller and the pipe 16 becomes small, and the processing load per rolling roller can be reduced.

As a result, since the machining force to the pipe 16 can be reduced, deformation of the pipe 16 does not occur.

In addition, since the processing force required for rolling is reduced, the pressing force generating means of the rolling apparatus can be simplified.

In this processing apparatus, the center position of the pipe 16 is not restrained so that excessive force is not applied to the pipe.

It is naturally determined that it is surrounded by the roll roller groups 10, 12, 14 at the central position of the pipe 16.

In this case, the rolling roller groups 10 and 12 approach the rolling roller 14, and the pipe press-in amounts for each roller are not the same as shown in Figs. The location fluctuates.

This technique allows for this variation, which allows for rolling on thinner pipes.

In addition, as shown in Figs. 1 and 2, the radius of each rolling roller is secured as large as possible, thereby allowing the pipe to be enclosed in the space to be surrounded by the rolling roller groups 10, 12, 14 during processing. Do not let go.

Fig. 10 is a side view showing the pressing force generating means of the roll processing apparatus according to the present embodiment.

As mentioned above, the rolling roller 10 and the rolling roller 12 are driven rollers, and are rotatably provided in the lever 30 as shown in FIG.

The rotary drive shaft 18 of the rolling roller 14 is rotatably mounted on the frame of the rolling device, not shown, and its position is floating.

The motor is provided in the rotation drive shaft 18 of the rolling roller 14, and rotates in the arrow direction.

In this embodiment, the pressing force required for rolling processing is 2000 N, and this force is less than half of the processing force in the case of the conventional rolling processing apparatus (all rolling contours of the rolling roller are the same).

If the processing force is about 2000N, it is not necessary to use the hydraulic mechanism, and the air cylinder 24, the link mechanism 28, and the lever 30 can be used.

In this case, the air cylinder 24 rotatably installed on the fixed shaft 22 fixed to the frame (not shown) generates a cylinder thrust of 180N.

The link mechanism 28 having the fixed shaft 26 as a point amplifies this thrust by five times (900 N).

In addition, the lever 30 coupled to the fixed shaft 20 is amplified by about 2.2 times (2000N).

By this force, the rolling rollers 10 and 12 are pushed up and the pipe 16 sandwiched between the rolling roller groups is pressed by approaching the distance between the centers of rotation of the rolling roller groups.

In this state, by rotating the rolling roller 14, the pipe 16 and the other rolling rollers 10 and 12 are driven to follow.

As described above, since the pressing force required for rolling is small, it is possible to switch from the large expensive hydraulic drive device used so far to the small and low cost air drive device.

This can significantly reduce the size and cost of the rolling mill.

Fig. 11 is a partial sectional view showing the tube end portion of the roll processing apparatus according to the present embodiment.

This accepts an end opposite to the end of the pipe on the side of the pipe, and as shown in Fig. 11, the end of the pipe 16 is opposite to the end of the pipe 16 on the opposite side.

The tube end portion 40 slides in the axial direction of the pipe 16, and the thrust load applied to the tube end portion 40 during rolling is carried out by the thrust bearing portion 42, the roller-shaped bearing portion 44, and the oil-free bearing water. It is structured to block and absorb with the part 46 and the spring 48.

The structure of the pipe end portion absorbs the extension in the axial direction of the pipe 16 which occurs as the roll processing proceeds.

It is solved only by receiving the opposite end part of the pipe 16 as this pipe end part during rolling process, and it is not necessary to restrain the central axis position of the pipe 16 at the processing side end part.

The pipe 16 is fitted into the roll roller group and positioned.

Since the central axis position of the pipe does not need to be constrained at the machining end, the structure of the rolling mill can be simplified.

In addition, the cost can be reduced because the required precision of the components can be lowered.

As described above, the rolling surface contours of the plurality of rolling rollers are different for each rolling roller, and the rolling surface of the pipe is distributed to other rolling rollers and pressurized to enable rolling processing with a small pressing force.

This makes it possible to roll a thin pipe without deforming the circular section.

In addition, since the rolling processing can be carried out with a small pressing force, the pressing force generating means of the rolling processing apparatus can be simplified, thereby minimizing the cost and reducing the cost of the rolling processing apparatus.

As mentioned above, although the rolling actuator and the processing method which concern on embodiment of this invention were demonstrated, the application range of this invention is not limited by the said Example.

That is, the present invention can be implemented in a modified and improved form, often based on the knowledge of the parties.

For example, in this embodiment, although there are three rolling rollers used for a rolling mill, there may be at least two rolling rollers.

The use of three or more roll rollers can constrain the pipe center position with only a group of roll rollers, without the need for means to constrain the different pipe center positions, thus simplifying the mechanism.

For example, in this embodiment, although the air cylinder, the link mechanism, and the lever were used for the pressing force generation means, it can be used as long as the rolling roller can be a mechanism which can pressurize a pipe appropriately.

According to the processing method as described above, the center of the pipe can be processed in a floating state, and the pressing force can be reduced to each roll roller without applying excessive force to the pipe, and the roll processing can be carried out on a thin pipe. .

In addition, this processing method eliminates the need for uniform pipe indentation for each surface roller, which simplifies the structure of the pressing force generating means, and allows the variation of the center position of the pipe during processing to reduce the structure of the rolling mill. I can simplify it.

Claims (3)

A rolling mill comprising: at least two rolling roller groups, torque generating means for rolling each rolling roller around a pipe, and pressing force generating means for approaching the distance between the rotation centers of the rolling roller groups, Rolling surface contour of the rolling roller group is characterized in that each rolling roller is formed differently from each other while the roller radius is changed rapidly or gently with respect to the position along the central axis of rotation. In the rolling process for rolling at least two roll roller groups by pressing the pipe at two or more places separated in the circumferential direction of the circular cross-section pipe, Rolling processing method characterized in that for each rolling roller is processed from the shape of the vicinity of the bone of the pipe to the shape of the vicinity of the peaks of the projection with different rolling surface in the axial direction. In the rolling process for rolling at least three roll roller groups by pressing the pipe to at least three places separated in the circumferential direction of the circular cross-section pipe, Rolling processing is characterized in that for each rolling roller from the shape of the vicinity of the bone of the pipe to the shape of the vicinity of the peaks of the projections, the rolling surface is changed in the axial direction without restraining the pipe center position.