JP3673182B2 - Rolling processing equipment and rolling processing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rolling processing apparatus and a rolling processing method in which a rolling roller group is pressed against a pipe having a circular cross section.
[0002]
[Prior art]
When a groove or bead extending in the circumferential direction is formed by plastic working at the end of a gas pipe connecting a gas hose, a rolling technology using a rolling roller group is widely used.
The rolling processing apparatus includes a plurality of rolling roller groups, torque generating means for rolling each rolling roller around a pipe, and pressurizing force generating means for pressing the rolling roller group against the pipe. A plurality of rolling roller groups are brought into contact with the outer periphery of the pipe at a plurality of locations separated in the circumferential direction of the pipe, and the rolling roller group is moved to the outer periphery of the pipe by making the distance between the rotation centers of the rolling roller group approach by the pressure generating means The rolling roller group is rolled around the pipe by the pressing and torque generating means.
In order to roll into a metal pipe, it is necessary to press the rolling roller group against the pipe with a large pressing force. Usually, the rolling roller group is pressed against the pipe using a hydraulic cylinder that can obtain a large pressing force. wear.
Moreover, the conventional rolling processing apparatus is provided with the restraint mechanism which clamps a pipe edge part and maintains a pipe center position to a fixed position.
[0003]
[Problems to be solved by the invention]
When the pipe is thick, it can be rolled with the above apparatus and the above method without any particular problem. However, when rolling into a thin pipe, the pipe cross-section is irregularly deformed and the intended rolling process cannot be performed. This is because when a pressing force necessary for rolling is applied to the rolling roller group, the thin pipe cross-section is irregularly deformed before rolling. For example, when a steel pipe having a wall thickness of 1 mm or less is rolled, a phenomenon that the cross section is deformed to a pentagon or an ellipse frequently occurs.
[0004]
An object of this invention is to implement | achieve the rolling processing apparatus and the rolling processing method which can be rolled into a thin pipe | tube with a thin cross section, without disturbing the shape of a cross section.
[0005]
[Means, actions and effects for solving problems]
The rolling processing apparatus of the present invention includes a pipe having a circular cross section, a ridge extending in the circumferential direction with a relatively large diameter, and a valley bottom extending in the circumferential direction with a relatively small diameter. And the groove | channel extended in the circumferential direction comprised by connecting the peak part and a valley bottom part and the intermediate part extended in the circumferential direction is processed. In particular, the rolling processing apparatus of the present invention includes a group of rolling rollers that are pressed against the outer peripheral surface of the pipe at a plurality of positions separated from each other in the circumferential direction of the pipe having a circular cross section and rotate in each direction. The rolling roller group includes a rolling roller on which a machining surface for rolling the ridge portion is formed, a rolling roller on which a machining surface for rolling the valley bottom is formed, and an intermediate portion. And a rolling roller on which a processed surface to be rolled is formed .
There are various modes for rolling each rolling roller around the pipe. For example, FIG. 3A illustrates a mode in which the rolling roller 14 is rotated and the pipe 16 and the rolling rollers 10 and 12 are driven to rotate. In this case, since the pipe 16 rotates, if the pipe 16 is fixed, each rolling roller 10, 12, 14 revolves around the pipe 16 while rotating. Each rolling roller 10, 12, 14 does not slide relative to the pipe 16. In this specification, the rolling roller revolves around the pipe without rotating with respect to the pipe.
FIG. 3B illustrates the case where the pipe 16 is rotated and the rolling roller groups 10, 12, 14 are driven to rotate. FIG. 3C illustrates a case where the rolling rollers 10, 12, 14 and the pipe 16 are driven to rotate by rotating the rotation center of the rolling roller group around the pipe. In any case, the rolling roller revolves around the pipe while rotating without sliding on the pipe. Various modes are included in the torque generating means for rolling each rolling roller around the pipe.
[0006]
The rolling processing device of the present invention includes a ridge portion that extends in the circumferential direction in a relatively large diameter state, a valley bottom portion that extends in the circumferential direction in a relatively small diameter state, and a ridge It is a rolling processing apparatus for processing the groove | channel extended in the circumferential direction comprised by connecting the part and the valley bottom part, and the intermediate part extended in the circumferential direction. The rolling roller group that is pressed against the outer peripheral surface of the pipe and rotates in each direction is formed with a rolling roller on which a processing surface for rolling the ridge portion is formed and a processing surface for rolling the valley bottom portion. A rolling roller and a rolling roller on which a processing surface for rolling the intermediate portion is formed, and the rolling roller group adds the pipe at a plurality of positions separated in the circumferential direction of the pipe. Press. According to this configuration, the pressing force of each rolling roller can be reduced, the total pressing force applied to the pipe by the rolling roller group can be reduced, and the rolling process can be performed while reducing the stress applied to the pipe. For this reason, it can be rolled while keeping the cross section of the thin-walled pipe undisturbed.
[0007]
In the rolling processing method of the present invention, the wall of the pipe having a circular cross section has a ridge extending in the circumferential direction with a relatively large diameter and a valley bottom extending in the circumferential direction with a relatively small diameter. And the groove | channel extended in the circumferential direction comprised by connecting the peak part and a valley bottom part and the intermediate part extended in the circumferential direction is processed. In the rolling processing method of the present invention, in particular, there is provided a rolling roller on which a processing surface for rolling at the peak portion is formed, and a processing surface for rolling the intermediate portion, in a state where the pipe center is not constrained. It is formed on the wall of the pipe at a plurality of positions separated in the circumferential direction by a rolling roller group including a rolling roller formed and a rolling roller formed with a processing surface for rolling the valley bottom. It is characterized by rolling while applying pressure .
[0008]
According to this method, the rolling process can be performed in a state in which the pressing force of each rolling roller is reduced and the total pressing force applied to the pipe by the rolling roller group is also reduced.
In addition, according to this processing method, the pipe center can be processed in a floating state, it is difficult to apply excessive force to the pipe, and the pressure applied to each rolling roller can be reduced. Can be rolled into a pipe.
Furthermore, according to this processing method, since it is not necessary to equalize the amount of pipe pushing for each roller, the structure of the pressure generating means can be simplified. By allowing the fluctuation of the pipe center position during processing, the structure of the rolling processing apparatus can be simplified.
[0009]
Another rolling apparatus according to the present invention comprises a pipe having a circular cross section, a ridge extending in the circumferential direction with a relatively large diameter, and a circumferential direction with a relatively small diameter. A groove extending in the circumferential direction is processed with the bottom of the valley. In particular, the rolling processing apparatus of the present invention includes at least two rolling rollers that are pressed against the outer peripheral surface of the pipe and rotated in at least two places separated in the circumferential direction of the pipe having a circular cross section. The first rolling roller is formed with a processed surface for rolling the ridge, and the second rolling roller is formed with a processed surface for rolling the valley bottom. And
Here, “first” and “second” do not indicate the order of arrangement or the like, but are simply used to distinguish them from each other. According to this configuration, the pressing force of each rolling roller can be reduced, the total pressing force applied to the pipes by these rolling rollers can be reduced, and the rolling process can be performed while reducing the stress applied to the pipes. . For this reason, it can be rolled while keeping the cross section of the thin-walled pipe undisturbed.
[0010]
Another rolling method according to the present invention includes a pipe having a circular cross section, a ridge extending in the circumferential direction with a relatively large diameter, and a circumferential direction with a relatively small diameter. A groove extending in the circumferential direction is processed with the bottom of the valley. In the rolling processing method of the present invention, in particular, the rolling roller is formed by a rolling roller on which a processing surface for rolling the ridge portion is formed and a rolling roller on which a processing surface for rolling the valley bottom is formed. Rolling is performed while applying pressure to the wall of the pipe at at least two points apart in the direction.
According to this processing method, the rolling process can be performed in a state in which the pressing force of each rolling roller is reduced and the total pressing force applied to the pipe by the rolling roller group is also reduced.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
A preferred embodiment of the present invention will be described with reference to FIGS.
1 and 2 are cross-sectional views of the main parts showing a rolling roller group and a pipe processed by the rolling roller group of the rolling processing apparatus according to the present embodiment, FIG. 1 is before processing, and FIG. Indicates during processing and at the end of processing.
As shown in FIG. 1, the three rolling rollers 10, 12, 14 and the pipe 16 are positioned such that the rolling roller group 10, 12, 14 surrounds the outer peripheral surface of the pipe 16 in the circumferential direction. . Torque generating means (not shown) is attached to the rolling roller 14 and rotates in the direction of the arrow. The rolling roller 10 and the rolling roller 12 are driven to rotate. Further, the pipe 16 is held freely rotating. The pipe center is not constrained, and its position is constrained only by the rolling roller groups 10, 12, and 14.
[0012]
As shown in FIG. 2, during the rolling process, the rotation centers of the rolling roller 10 and the rolling roller 12 approach toward the rotation center of the rolling roller 14. As a result, the rolling rollers 10, 12, and 14 are pressed in the pipe center direction against the pipe outer peripheral surface at three locations separated in the circumferential direction of the pipe 16. When the rolling roller 14 rotates while the rolling roller groups 10, 12, and 14 are pressed toward the center of the pipe 16 on the outer periphery of the pipe 16, the pipe 16 is driven to rotate in the direction of the arrow, Each of the rollers 10 and 12 is driven to rotate in the direction of the arrow. In this way, the torque generator for rotating the rolling roller 14 rolls the rolling roller group 10, 12, 14 around the pipe 16.
[0013]
FIG. 3 shows various modes of rolling the roller groups 10, 12, and 14 around the pipe 16. The white arrows in FIGS. 3A, 3B, and 3C indicate that the torque is generated by the torque generating means, and the solid arrows indicate that the rotation is driven.
[0014]
FIG. 3A shows the rolling processing apparatus described with reference to FIGS. 1 and 2, and as described above, torque generating means (not shown) for rotating the rolling roller 14 includes the rolling roller groups 10, 12, 14 is rolled around the pipe 16.
[0015]
In the example shown in FIG. 3B, torque generating means (not shown) is attached to the pipe 16. The rolling roller groups 10, 12 and 14 are pressed against the outer periphery of the pipe 16 toward the center of the pipe 16 and are rotatable. When the pipe 16 is rotated in the direction of the arrow by the torque generating means in this state, the rolling rollers 10, 12 and 14 are driven to rotate in the direction of the arrow, respectively. In this example, the means for rotating the pipe rolls the rolling roller group 10, 12, 14 around the pipe 16.
[0016]
In the example shown in FIG. 3C, the pipe 16 is restrained so as not to rotate, and the rotation centers of the three rolling rollers 10, 12, and 14 are rotated around the center of the pipe 16 by torque generating means (not shown). Rotated. The rolling roller groups 10, 12, and 14 are pressed against the outer periphery of the pipe 16 toward the center of the pipe 16 and are rotatable around the center of rotation. When the rotation centers of the rolling rollers 10, 12, and 14 are rotated around the center of the pipe 16 by the torque generating means in this state, the rolling roller groups 10, 12, and 14 are surrounded by a white arrow around the pipe 16. Revolve in the direction. At this time, the rolling roller group revolves without sliding while contacting the fixed pipe 16, so that each rolling roller rotates in the direction of the solid arrow.
[0017]
In the three types of rolling examples shown in FIG. 3, the rotating bodies that are directly rotated by the torque generating means are different from each other. However, as a result, in general, each rolling roller rotates while relatively rotating around the pipe. Revolve. In addition, the group of rolling rollers does not slide with respect to the pipe at the portion in contact with the pipe 16. There are no particular restrictions on the rolling form available in the present invention.
[0018]
4-6 is a figure which shows the rolling process of the pipe 16 by each of the three rolling rollers 10, 12, and 14, FIG. 4 shows the progress of rolling by the rolling roller 10, and 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. 4A to 6A show a state before processing, FIG. 4B shows a state during processing, and FIG. 6C shows a state at the end of processing.
7 to 9 are partial enlarged views of the protrusions of the respective rolling rollers of FIGS. 4 to 6 and the pipe 16 to be pressurized by the protrusions. FIGS. 7 and 8 are FIGS. 9 corresponds to FIG. 6 respectively. The hatches in FIGS. 7 to 9 indicate the areas on the pipe that are rolled by each rolling roller.
[0019]
As described above, each of the three rolling rollers is positioned so as to surround the outer peripheral surface of the pipe 16 in the circumferential direction. Further, as shown in FIGS. 4 to 6, the three rolling rollers have different rolling surface profiles. The rolling surface profile here refers to the cross-sectional shape of the rolling roller shown in FIGS. 4A to 6A, and more precisely, the rotation center axis in the cross section including the rotation center axis of the rolling roller. A two-dimensional curve determined by the position along the axis and the roller radius at that position. As shown in FIGS. 4A to 6A, the rolling surface profiles of the respective rolling rollers are all different.
[0020]
As shown in FIG. 9, the rolling roller 14 has a rolling surface profile in which the roller radius suddenly changes with respect to the position along the rotation center axis. As shown in FIG. 7, the rolling roller 10 has a rolling surface profile in which the roller radius gradually changes with respect to the position along the rotation center axis. As shown in FIG. 8, the rolling roller 12 has an intermediate rolling surface profile.
At the time of rolling processing, as shown in FIG. 9, the rolling roller 14 rolls the shape near the valley bottom of the pipe 16. As shown in FIG. 7, the rolling roller 10 rolls the shape in the vicinity of the peak of the protrusion that is rolled onto the pipe 16. As shown in FIG. 8, the rolling roller 12 performs a rolling process on an intermediate area between the rolling area formed by the rolling roller 14 and the rolling area formed by the rolling roller 10. The processing area by each rolling roller is shifted in the rotation center axis direction.
[0021]
In this way, the rolling surface of the pipe 16 is dispersed and pressed on each of the three rolling rollers, so that the contact area between each rolling roller and the pipe 16 is reduced, and the processing load per rolling roller is reduced. Can be reduced. Thereby, since the applied pressure to the pipe 16 can be reduced, the pipe 16 is not deformed. Furthermore, since the pressurizing force required for rolling is reduced, the pressurizing force generating means of the rolling device can be simplified.
[0022]
In this processing apparatus, the center position of the pipe 16 is not constrained so that an excessive force does not act on the pipe. The center position of the pipe 16 is naturally determined by being surrounded by the rolling roller groups 10, 12, and 14.
In this case, since the rolling roller groups 10 and 12 are approaching the rolling roller 14 and, as shown in FIGS. The center position varies. In this technique, by allowing this variation, it is possible to perform rolling processing on a thin pipe.
As well shown in FIG. 1 and FIG. 2, the radius of each rolling roller is ensured as large as possible, thereby being surrounded by the rolling roller groups 10, 12, and 14 during processing. The pipe is prevented from escaping from the space.
[0023]
FIG. 10 is a view showing the pressure generating means of the rolling processing apparatus according to the present embodiment. As described above, the rolling roller 10 and the rolling roller 12 are driven rollers and are rotatably attached to the lever 30 as shown in FIG. The rotational drive shaft 18 of the rolling roller 14 is rotatably attached to a frame of a rolling device (not shown), and its position is not moved. A motor is attached to the rotational drive shaft 18 of the rolling roller 14 and rotates in the direction of the arrow.
[0024]
In this embodiment, the pressurizing force required for the rolling process is 2000 N, and this force is half of the pressurizing force in the case of the conventional rolling processing apparatus (the rolling surface profiles of all the rolling rollers are equal). It is as follows. If the applied pressure is about 2000 N, it is not necessary to use the hydraulic mechanism, and it can be obtained by using the air cylinder 24, the link mechanism 28, and the lever 30.
[0025]
In this case, an air cylinder 24 rotatably attached to a fixed shaft 22 fixed to a frame (not shown) generates a cylinder thrust of 180 N. A link mechanism 28 having the fixed shaft 26 as a fulcrum amplifies this thrust five times (900 N). Further, a lever 30 that is rotatable on the fixed shaft 20 is amplified about 2.2 times (2000 N). With this force, the rolling rollers 10 and 12 are pushed up, and the distance between the rotation center axes of the rolling roller group is made closer, whereby the pipe 16 sandwiched between the rolling roller groups is pressurized. In this state, the pipe 16 and the other rolling rollers 10 and 12 are driven to rotate by rotating the rolling roller 14.
As described above, since the pressurizing force required for rolling is small, it is possible to convert from a large and expensive hydraulic drive device used so far to a small and inexpensive air drive device. As a result, the rolling processing apparatus can be downsized and the cost can be significantly reduced.
[0026]
FIG. 11 is a view showing a tube end receiving portion of the rolling processing apparatus according to the present embodiment. This accepts the end of the pipe opposite the processing end. As shown in FIG. 11, the end of the pipe 16 opposite to the processing end is inserted into the pipe end receiver 40. The pipe end bearing 40 slides in the axial direction of the pipe 16, and the thrust load applied to the pipe end receiver 40 during rolling is received and absorbed by the thrust bearing 42, the roller bearing 44, the oilless bearing 46 and the spring 48. It has a structure to do.
[0027]
This structure of the pipe end receiving portion absorbs the elongation in the axial direction of the pipe 16 that occurs as the rolling process proceeds. During the rolling process, it is only necessary to receive the opposite end portion of the pipe 16 by this pipe end receiving portion, and there is no need to constrain the center axis position of the pipe 16 at the processed end portion. The pipe 16 is positioned between the rolling roller groups. Since it is not necessary to constrain the center axis position of the pipe at the processing side end, the structure of the rolling processing apparatus can be simplified. In addition, the required accuracy of the component parts can be lowered, leading to cost reduction.
[0028]
As described above, the rolling surface profile of a plurality of rolling rollers is made different for each rolling roller, and the rolling surface of the pipe is dispersed and pressed by different rolling rollers, so that rolling with low pressure is performed. Processing becomes possible. Thereby, a rolling process can be given to a thin pipe without disturbing the cross-sectional shape. In addition, the rolling process can be performed with a low pressure, which can simplify the means for generating the pressure of the rolling process device, thereby reducing the size and cost of the rolling process device. To do.
[0029]
As mentioned above, although the rolling processing apparatus and its processing method of embodiment of this invention were demonstrated, the application range of this invention is not limited to said Example at all. In other words, the present invention can be implemented in various modifications and improvements based on the knowledge of the parties concerned.
For example, in the present embodiment, there are three rolling rollers used in the rolling processing apparatus, but any number of at least two rolling rollers may be used. If three or more rolling rollers are used, no other means for constraining the center position of the pipe is required, and the center position of the pipe can be constrained only by the group of rolling rollers, thereby simplifying the mechanism.
For example, in the present embodiment, an air cylinder, a link mechanism, and a lever are used as the pressure generating means, but the present invention is not limited to this as long as the rolling roller can pressurize the pipe appropriately.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an essential part showing a state before processing of a rolling roller and a pipe according to an embodiment.
FIG. 2 is a cross-sectional view of the main part showing the rolling roller and the pipe according to the embodiment during processing and at the end of processing.
FIG. 3 is a cross-sectional view showing a main part of the rolling roller and the pipe according to the embodiment during processing and at the end of processing.
FIG. 4 is a side view of a cross section of a main part in a process of rolling a pipe by the rolling roller 10;
FIG. 5 is a side view of a cross-section of the main part in the process of rolling a pipe by the rolling roller 12;
FIG. 6 is a side view of a cross section of a main part in a process of rolling a pipe by the rolling roller 14;
FIG. 7 is a partially enlarged view of an edge portion of the rolling roller 10 and a pipe 16 to be pressed.
FIG. 8 is a partially enlarged view of an edge portion of the rolling roller 12 and a pipe 16 to be pressed.
FIG. 9 is a partially enlarged view of the edge portion of the rolling roller 14 and the pipe 16 to be pressed.
FIG. 10 is a view showing a pressure generation means of the same device.
FIG. 11 is a view showing a tube end receiving portion of the apparatus.
[Explanation of symbols]
10: Rolling roller 12: Rolling roller 14: Rolling roller 16: Pipe 18: Rotating 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: Pipe end bearing 42: Thrust bearing 44: Roller bearing 46: Oil-free bearing 48: Spring

Claims (4)

Connected to the wall of a pipe with a circular cross section, a ridge extending in the circumferential direction with a relatively large diameter, a valley bottom extending in the circumferential direction with a relatively small diameter, and a ridge and a valley bottom And a rolling processing device for processing a circumferentially extending groove composed of an intermediate portion extending in the circumferential direction,
  It is provided with a rolling roller group that is pressed against the outer peripheral surface of the pipe at a plurality of positions separated in the circumferential direction of the pipe having a circular cross section and rotates in each direction.
  A rolling roller on which a processing surface for rolling the ridge is formed;
  A rolling roller on which a processing surface for rolling the valley bottom is formed;
  A rolling roller on which a machining surface for rolling the intermediate portion is formed;
  A rolling processing apparatus characterized by comprising: Connected to the wall of a pipe with a circular cross section, a ridge extending in the circumferential direction with a relatively large diameter, a valley bottom extending in the circumferential direction with a relatively small diameter, and a ridge and a valley bottom And a rolling method for processing a circumferentially extending groove composed of an intermediate portion extending in the circumferential direction,
In a state where the pipe center is not constrained, at least a rolling roller on which a processing surface for rolling the ridge portion is formed, a rolling roller on which a processing surface for rolling the intermediate portion is formed, and a valley bottom portion It is characterized in that it is rolled while applying pressure to the wall of the pipe at a plurality of positions separated in the circumferential direction by a group of rolling rollers provided with a rolling roller on which a processing surface is formed. Rolling processing method. The pipe wall having a circular cross section is provided with a ridge extending in the circumferential direction with a relatively large diameter and a valley bottom extending in the circumferential direction with a relatively small diameter in the circumferential direction. It is a rolling processing device for processing elongated grooves,
It has at least two rolling rollers that are pressed against the outer peripheral surface of the pipe at at least two locations apart from each other in the circumferential direction of the pipe having a circular cross section and rotate.
The first rolling roller has a processed surface for rolling the ridge,
The second rolling roller has a processing surface for rolling the valley bottom.
A rolling processing apparatus characterized by that. The pipe wall having a circular cross section is provided with a ridge extending in the circumferential direction with a relatively large diameter and a valley bottom extending in the circumferential direction with a relatively small diameter in the circumferential direction. It is a rolling process method for processing an elongated groove,
At least two points separated from each other in the circumferential direction by a rolling roller on which a machining surface for rolling the ridge portion is formed and a rolling roller on which a machining surface for rolling the valley bottom portion is formed. A rolling method characterized by rolling while applying pressure to a wall .

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