JPH035378Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a pipe end fixing device for fixing a workpiece so that it does not move when cutting and removing a weld bead on the inner surface of a welded pipe.

[Conventional technology]

Conventionally, a generally well-known method for clamping this type of welded pipe is to clamp the end of the welded pipe 1 from the outside as shown in the side view shown in Fig. 10 and the front view shown in Fig. 9. There is a method of clamping by applying a downward force from above and below or from left and right using a cylinder 3 or the like via the clamp 2. Further, as this type of clamp device, there is one shown in Japanese Patent Laid-Open No. 58-217634.

However, with this method, when the pipe diameter is wide ranging from small to large, it is necessary to match the entire clamping device to the outermost diameter of the pipe when adapting to each pipe diameter. When the ratio, t/D, is small, the welded pipe 1 will often deform under pressure greater than the cutting reaction force of the cutter 4, and conversely, under pressure that does not deform the welded pipe 1, the welded pipe 1 will deform due to the cutting reaction force. Since chatter vibration occurs in 1, in order to satisfy both conditions, there are inevitably restrictions on the adaptable pipe.

[Problem that the invention attempts to solve]

The structural problems of this type of conventional clamp device are as follows. That is, UO bent pipe manufacturing equipment and the like manufacture pipes with a wide range of diameters from about 18'' to 56''. In the conventional method, the size of the device is almost determined by the diameter of the pipe to which it is applied, so the entire clamping device has to be made to fit the maximum diameter of the pipe, resulting in high costs and a large space requirement. Also, as mentioned above, t/
In a pipe with a small D, the pipe itself is likely to undergo plastic deformation even with a slight reduction force, while if the reduction force is small enough not to deform, it may cause problems such as pipe chatter vibrations due to cutting, and the clamping point may be too close to the cutting part. Because they are far apart, pipe runout is likely to occur and cutting accuracy is poor. The present invention is intended to solve these problems.

[Means for solving problems]

Therefore, instead of the conventional method of clamping the end of the welded pipe from the top and bottom or from the left and right, the present invention clamps the inside and outside of the welded pipe end near the left and right sides of the weld bead from above and below. This is a means to solve the problem by fixing from the bottom, left and right with a pair of left and right inner clamps and the same outer clamp, and pressing a chatter prevention plate on the lower surface of the weld bead with a cylinder. It is something.

[Effect]

Regardless of the diameter of the welded pipe, the area near the weld bead is clamped from the top, bottom, left, and right, so the size of the device has little to do with the pipe diameter, and it clamps the area near the left and right of the weld bead being cut. Therefore, the rolling force can be small, and therefore, the above-mentioned restriction due to t/D can also be reduced. In addition to clamping the vicinity of the cutting part from above, below, left, and right, the lower surface of the pipe is supported by a chatter vibration prevention device in the cutting part to ensure stable cutting, which eliminates chatter vibrations during cutting and improves cutting accuracy. be done.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic perspective view, FIG. 2 is a side view, FIG. 3 is a front view, and FIG. 4 is a diagram of FIGS. Line sectional view, Figure 5 is an explanatory diagram of the clamp, Figure 6 is a rear view,
FIG. 7 is a schematic enlarged view of section B in FIG. 6, and FIG. 8 is a diagram of a chip collection chute. Broadly speaking, the structure consists of a clamp device consisting of an inner clamp and an outer clamp, a chatter vibration prevention device, and a cylindrical chip collection chute for operating these devices. To explain from the pipe clamp device 13, a common pedestal 12 for the pipe clamp device 13 and the chatter vibration prevention device 14 is provided on the base 11. There are a plurality of guide rods 15 arranged horizontally from one end of the common pedestal 12, and the clamp movable pedestal 1 is moved from a standby position 18 to a clamp position 18' by a clamp movement cylinder 17 shown in FIG.
6 are slidably fitted. There is a pedestal 19 on the clamp moving pedestal 16, which is provided with a plurality of turning pins 20 like the guide rod 15, and has a hollow shaft A21 on which an arm A23 and an inner clamp 25 are fixed, and an outer clamp on the upper end thereof. 26
The hollow shaft B22, to which the other end of the arm B24 holding the arm B24 is fixed, is fitted so as to be swingable and symmetrical to the left and right. Further, brackets 27 are provided on both sides of the clamp moving frame 16, and the cylinder A2 is connected to the arm A23 via a joint or the like.
8 is attached symmetrically to the left and right. Inner clamp 2
The upper end of 5 is bent into a claw shape so that the welded pipe 1 can be clamped from the inside, and the lower end is provided with a bracket 32 for mounting a cylinder, and the outer clamp 26 held by arm B24 is provided with a bracket 32 on the lower end. A cylinder B29 is engaged with the lower part via a joint or the like. These respective members are integrally connected for the left and right parts and are symmetrically mounted in relation to each other. In addition, the left and right two cylinders A2
8. Similarly, for speed synchronization of cylinder B29, pressure oil is concentrated by one solenoid valve for each of the two cylinders, and the lower surface of the claw part of the inner clamp 25 and the outer clamp 26
Rubber 33 or the like is pasted on the upper surface of the welded pipe 1, so that it can be tightly clamped to the welded pipe 1. The anti-chatter device 14 has a presser plate 34 to which rubber 33 is attached, and the presser plate 34 is connected to a shaft 35 and a spherical bushing 36 (FIG. 7) at a predetermined angle, and the welded pipe
It is designed to be able to tilt up, down, left and right to accommodate strain and deformation, and during standby, it is lowered as shown in Figure 6. When the end of the welded pipe 1 is fixed by the pipe clamp device 13, the holding plate 3
4 is guided by a plurality of lifting rods 38,
It is raised by the cylinder C30 to the position shown by the chain line in FIG. 6 and comes into pressure contact with the lower surface of the welded pipe 1 via the rubber 33, thereby preventing chatter. As shown in Fig. 8, the chip collection chute 39 is arranged in the gap of the device, and the cutting chips of the weld bead are collected by natural sliding down. , an air pipe 40 is arranged, and jet air is ejected at an appropriate angle to cause the chips to slide down.

In the apparatus configured as described above, when the welded pipe 1 is carried into a predetermined position on the apparatus with the bead portion facing down, the cylinder B29 is in the waiting position 18.
"IN" pulls down the arm B24 holding the outer clamp 26, and the cylinder A2
8 "OUT" pushes arm A23 up,
The clamp portion where the inner surface clamp 25 and the outer surface clamp 26 are open is the clamp moving cylinder 1.
When the clamp moving frame 16, which is engaged by "IN" of 7, slides on the surface of the guide rod 15 and moves to the clamp position 18', the end face of the welded pipe 1 fits into the opened clamp part. In that state, cylinder A
28 is set to "IN", and the hollow shaft A21 and the inner surface clamp 25, which are integrated through the arm A23, are pulled down to clamp the inside of the welded pipe 1. Next, when the cylinder B29 held by the inner clamp 25 via the bracket 32 is turned ``OUT'', the outer clamp 26 is pushed up via the arm B24 and clamps the outside of the welded pipe 1. In other words, when one cylinder B 29 is set to "OUT", the outer clamp 26 is pushed up like scissors, the inner clamp 25 is pulled down, and the welded pipe 1 is firmly clamped. The mechanism is such that the clamped part is pulled down by the "IN" of cylinder A28. This movement is performed on the left and right sides. For speed synchronization of the left and right cylinders A28 and B29, as mentioned above, one solenoid valve is used for each of the two cylinders A and B, so that one cylinder (for example, the right side) When it moves in advance and lightly touches the welded pipe 1, the other side (for example, the left side) follows and operates, and finally the upper, lower,
A stable clamp is measured from the left and right. Fourth
The figure shows the clamping situation for small diameter pipes and large diameter pipes. Also, a rubber 3 is attached to the outside of the outer clamp 26.
3 is pasted, even if the welded pipe 1 is strained or deformed, the abutting surface is widened to ensure close contact and no slipping occurs. After the clamping is completed, the chatter vibration prevention device 1 is further guided by the lifting rod 38.
4 rises at the "OUT" position of the cylinder C30 and presses the lower surface of the welded pipe 1, thereby preventing the runout and chatter vibration of the welded pipe 1 caused by the downward cutting force that acts when cutting the inner bead, and 1
support in a stable state. Releasing the clamp, moving to the standby position, lowering the anti-chatter device, etc. are operations opposite to those described above. or,
As shown in FIG. 8, a cutting collection chute 39 is installed, and the chips generated by cutting the weld bead are sent onto the clamp movable frame 16 by natural sliding down the chute to a place far away from the device, and the chips are sent to a place far away from the device. Where the slope of the chute is gentle for reasons of convenience, jet air from the air pipe 40 can be used to slide down and collect the chute. Further, if the scattering of chips is acceptable, the cutting collection chute 39 is unnecessary, and only the clamping device and the vibration prevention device are required. In this way, the present invention is a device that is equipped with essential functions for cutting, such as clamping welded pipes, preventing vibration (chattering), and collecting chips.

In the above embodiment, solenoid valves are used to synchronize the speeds of the left and right cylinders, but a method in which the left and right cylinders are operated simultaneously using a link mechanism may also be used. This is for the case where the welded pipe is brought in at a constant level at the bottom, but for example, in a case where the welded pipe is brought in at a constant center level, this can be easily solved by making the common pedestal 12 up and down. The present invention is not limited to the above embodiments, and various modifications may be made without departing from the gist of the present invention.

[Effect of idea]

As explained above, according to the pipe clamping device and chatter vibration prevention device equipped with the chip chute of the present invention, the vicinity of the weld bead is clamped from above and below, from the left and from the right, regardless of the large or small diameter of the pipe. Therefore, the size of the device has little to do with the pipe diameter, and it can be manufactured compactly in a small space and at low cost.Since the area to be cut is clamped from above and below, and from the left and right, the rolling force can be small, and therefore, the above-mentioned The constraints caused by the t/D can be reduced.

In addition, the cutting part is not only clamped from all sides, but also supported from the bottom by a chatter prevention device, so that cutting is carried out in a stable state, so chatter vibrations during cutting can be prevented, and cutting accuracy is inevitably improved. Furthermore, by preventing chatter vibration, the life of the cutter tip is extended.

Since the machine is equipped with a chip chute, it is easy to collect the chips, and in addition to the above-mentioned effects, workability can be improved.

[Brief explanation of the drawing]

Fig. 1 is a schematic perspective view of the device according to the present invention, Fig. 2 is a side view, Fig. 3 is a front view, and Fig. 4 is a schematic perspective view of the device according to the present invention.
A sectional view taken along the line A-A, FIG. 5 is an explanatory diagram of the clamp, FIG. 6 is a rear view, FIG. 7 is a schematic enlarged view of part B in FIG. 6, and FIG. 8 is a chip collection chute diagram. FIG. 9 is a front view of the conventional device, and FIG. 10 is a side view of the same. 13... Pipe clamp device, 14... Chatter prevention device, 15... Guide rod, 16... Clamp moving frame, 17... Clamp moving cylinder, 20... Swivel pin, 21... Hollow shaft A, 22
...Hollow shaft B, 23...Arm A, 24...Arm B, 25...Inner surface clamp, 26...Outer surface clamp, 28...Cylinder A, 29...Cylinder B, 30...Cylinder C, 34... ...presser plate,
38... Lifting rod, 39... Chip collection chute.

Claims (1)

[Scope of utility model registration request] An inner surface clamp 25 that clamps the inner surface of the pipe on both sides by sandwiching the inner surface bead of the end of the welded steel pipe, and an outer surface clamp 26 that clamps the outer surface of the pipe at a position opposite to this inner surface clamp 25 can be opened and closed by a cylinder, respectively. A pipe end consisting of a pipe clamp device that is movable back and forth in the lengthwise direction of the pipe, and a vibration prevention device that presses the outer peripheral surface of the pipe and that is movable up and down by a cylinder on the side of the pipe and below the pipe. Part fixing device.