JPH0534119B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an end tab processing device that automatically and continuously cuts the tab plate of a straight seam pipe after welding and cuts the inner bead near the pipe end. More specifically, the present invention relates to an end tab processing device equipped with a tab plate cutting device having a simple structure and high precision.

In addition, there are two types of end tab processing: one is for straight seam pipes with the seam facing up, and the other is for straight seam pipes with the seam facing down. The end tab processing device of the present invention is intended for the former tube with the seam portion facing upward.

[Conventional technology]

In the manufacture of straight seam pipes, a third
As shown in the figure, it is customary to connect a tab plate 1' to the end face of a tube 51 after forming along an abutment line 52, and to perform preliminary welding of 10 to 20 cm on this tab plate. Once welding is completed, this tab plate is no longer needed, and work to remove it begins immediately.However, this work traditionally relied on humans, which was inefficient, and the work was simple and repetitive, so it was not suitable for job design. Even when viewed from above, it didn't look good.

In addition, the inner bead near the end of the pipe can cause welding defects when circumferentially welding the pipe, so it is necessary to remove it without fail, but this work is also a simple and repetitive manual process, so it is not efficient. It is considered unfavorable from both the technical and job design standpoints, and furthermore, since bead cutting generates a large amount of dust, improvements have been desired from the working environment standpoint as well.

For this reason, the process from cutting the tab plate to cutting the inner bead near the tube end can be said to be the most desirable process to be mechanized, but it is extremely difficult to mechanize it. Incidentally, as this type of automation device, for example, Japanese Patent Application Laid-Open No. 181530/1982 and Japanese Utility Model Application No. 59/1983
Although devices described in Japanese Patent No. 171056 and the like are known, none of them can satisfy the following requirements.

[Problem that the invention seeks to solve]

In order to mechanize end tab processing, the tab plate cutting device must specifically overcome all of the following problems.

(A) The ends of straight seam pipes that have been welded are usually shifted back and forth across the seam line, as shown in Figures 3 and 4. In such a case, from the viewpoint of yield, it is required to cut as shallowly as possible, as shown by the broken line in FIG. In addition, subsequent pipe manufacturing processes (e.g. pipe expansion process,
In order to minimize the adverse effects on the tube end bevel processing process, etc., it is desirable to make the cut at a shallow angle at the beginning and end of the cut.

(B) Because gas cutting is used, when cutting oxygen is released at the cutting start point A, a defect is created at the tube end as shown in FIG. 4, which deteriorates the shape of the cut surface and causes a decrease in yield.

(C) The thickness of the bead part is 1.2 to 2 times the thickness of the main pipe part, and it may not be possible to cut the bead part under the same cutting conditions as the main pipe part.

(D) In order to perform stable cutting, even if the pipe diameter changes or the pipe curvature is not constant in the pipe circumferential direction, the cutting torch must be kept at an appropriate height relative to the pipe outer circumferential surface during cutting. and maintain an attitude approximately perpendicular to the tangent line of the cutting point.

(E) Mechanization is meaningless if the structure is complex or the precision is low.

From this point of view, when looking at the above-mentioned known devices, the device described in JP-A-58-181530 requires electrical calculation to detect the discrepancy in the front-rear direction of the tube end, The mechanism becomes complicated and costs increase. Further, no measures are taken against the defective portion at the cutting start point A, leading to deterioration of yield. Cutting is performed at a constant low speed that allows the bead to be cut, resulting in poor efficiency. In addition, since this known device is intended for pipes with the seam facing down, the tab plate cutting device and the pipe inner bead removal device will interfere with each other on the same side. The design policy is fundamentally different from that of other devices, and the two cannot be equated.

The device described in Utility Model Application Publication No. 59-171056 is
Although it is intended for pipes with the seam facing up, it does not have a mechanism to detect discrepancies at the pipe ends, and the tab plate is cut with a uniform trajectory, resulting in a large loss in terms of accuracy and yield. . Furthermore, no measures are taken to prevent a defective portion at the cutting start point A, and no consideration is given to cutting the bead portion.

[Means for solving problems]

The present invention provides an end tab processing device that overcomes all of the above-mentioned problems (A) to (E), has a simple structure, is low in cost, and is equipped with a tab plate cutting device that is capable of highly accurate and stable cutting. As shown in the example diagrams in Figures 1 and 2, the straight seam tube has a tab plate on the seam extension line of the tube end, and the straight seam tube lies on the setting line extension line with the seam facing up. A pedestal 11 is disposed on the pedestal 11, which can move forward and backward, move horizontally, and go up and down, and a gripping member 14 is attached to the pedestal 11 and is clamped to the end of the tube while opening toward the straight seam tube and surrounding the tab plate from above and below. A movable block 18 and its drive mechanism 20 which can be moved laterally are attached to the upper jaw part 16 of the gripping member 14, and a movable block 18 is attached to the movable block 18 so as to be able to move forward and backward and move forward and backward toward the outer surface of the tube with a pressing means 26. The vertical member 25 has a vertical member 25 and two contact balls 27, 27 arranged so as to be in contact with the outer surface of the tube at a predetermined distance in the circumferential direction, and the vertical member 25 has an axis 29 in the tube axis direction. A profiling member 28 rotatably supported on the profiling member 28, a downward cutting torch 30 mounted perpendicularly to the line connecting the contact balls 27, 27 of the profiling member 28, and a cutting torch 30 mounted at right angles to the line connecting the contact balls 27, 27 of the profiling member 28, and a cutting torch 30 attached to the tube ends on both sides of the tab plate. A pair of left and right contacts 34, 34 that are in elastic contact, and a line connected to both contacts 34, 34 and parallel to a line connecting both contacts 34, 34, corresponds to the contacts 34, 34 and their midpoints. The midpoint pivot support 37 is fixed to the frame which is the upper jaw portion 16, and when the contactors 34, 34 contact the tube end, the tube end The links 35, 35 are set to form an inclination according to the amount of discrepancy, and the link 3
5, 35, a second tracing member 39 connected to the vertical member 25 so as to be movable back and forth with respect to the movable block 18; A drive mechanism 42 is provided, and the lower jaw portion 45 is provided with an upwardly directed tube inner surface weld bead removal device 4 equipped with a drive mechanism in the front and back direction.
6.

[Effect]

According to this end tab processing device, as particularly seen in the plan view of FIG.
34 come into contact with each other, and the links 35, 35 are tilted according to the amount of misalignment between the tube ends in the front and back direction. This link 35,
The second copying member 39 is in constant contact with the link 35, and the vertical member 25 connected thereto is positioned in the front-rear direction.
5 and 35, the cutting torch 30 supported by the vertical member 25 moves back and forth depending on the amount of offset of the tube ends, thereby cutting the tab plate 1'. In other words, discrepancies at the tube ends are automatically detected without electrical detection or calculation.
The cutting torch 30 automatically traces a path according to the amount.

Further, according to this processing device, the second copying member 39 is provided with a forward/backward movement drive mechanism 42 relative to its support, and the amount of forward/backward movement of the cutting torch 30 can be corrected at any time. You can take any route you want. This makes it possible to prevent the pipe end from being damaged at the start of the cut, and also allows the cutting angle of the start and end parts of the cut with respect to the pipe end to be freely set. The detailed reason will be described later in Examples.

〔Example〕

1A to 1C are a plan view (A in the same figure, a side view (B) in the same figure, and a front view (C in the same figure) showing the overall structure of an end tab processing apparatus embodying the present invention, and FIG. 2 is a They are a plan view (a), a longitudinal side view (b), and a front view (c) of the tab plate cutting device of the same device, showing an enlarged main part of the tab plate cutting device of the same device.

As shown in FIG. 1, a rail 2 is laid on an extension of the setting line of the straight seam pipe 1 and parallel to the same line, and a trolley 3 is placed on the rail 2. Driving gears 4, 4 are disposed below the truck 3, and engage with a rack 5 provided on the truck side and a rack 6 provided on the ground side, and drive a cylinder 7 provided at the rear of the truck 3. The tip of the rod is gear 4, 4.
The bearing 9 is engaged with the support shaft 8 of the. A lifting platform 10 equipped with a clamper 10' whose driving source is a cylinder (not shown) is mounted on the trolley 3.
A pedestal 11 is placed on this so that it can be moved laterally. Frame 1
The drive source of 1 is the motor 1 attached to the side of the pedestal 11.
It is 2. 13 is a lifting platform 10 erected on the trolley 3
This is a guide post to guide the stable horizontal movement of the robot.

The pedestal 11 has a U-shaped side gripping member 14, which is pivoted vertically with its open side protruding in the direction of the setting line (hereinafter, this direction will be referred to as the front and the opposite direction will be referred to as the rear). be supported. Lock pin cylinder 15 attached to the side of the pedestal 11
is for fixing this gripping member 14 in a horizontal state. A tab plate cutting device is attached to the upper jaw portion 16 of the gripping member 14, but its structure is similar to that of the second tab plate cutting device.
As shown in Figures A to C.

That is, as shown in FIGS. 2A to 2C, the upper jaw part 16 forms a frame with an open top and bottom, and two guide rods 17 are installed laterally inside the frame, on which a movable block 18 slides. Mounted as possible. A screw shaft 19 screwed into the movable block 18 is installed between the two guide rods 17, and a driving motor 20 is attached to the side surface of the frame. Two shafts 21 also extend through the movable block 18 in a slidable manner in the front-rear direction, and the front end and rearward portion thereof are connected to plates 22 and 2, respectively.
It is connected and fixed at 3. A spring 24 mounted on the shaft 21 is interposed between the front plate 22 and the movable block 18, and presses the shaft 21 forward against the movable block 18.

A vertical member 25 is attached to the rear of the rear plate 23 so as to be movable up and down, and the rod tip of a cylinder 26 erected and fixed at the front of the plate 23 is engaged with the upper part of the vertical member 25 to move vertically. Part 2
5 is pressed upward and downward. At the bottom of the vertical member 25, a copying member 28 having two contact balls 27 in the circumferential direction is rotatable around an axis 29 in the front-rear direction, and has one end connected to the movable block 18 and the other end connected to the copying member 28. It is supported by a pair of left and right springs (not shown) which are engaged so as to maintain a horizontal position at all times. A downward cutting torch 30 is attached to the rear surface of this copying member 28.
is mounted perpendicular to the line connecting the two contact balls 27.

The frame, which is the upper jaw part 16, also has a guide 31 on the outer side surface, into which a pair of left and right connecting rods 32 of equal length are fitted so as to be movable in the front-rear direction. This connecting rod 32 is always pulled forward by a spring 33. A contact 34 that contacts the tube end is fixed to the rear end of the connecting rod 32 so as not to interfere with the frame and the cutting torch 30. A pair of left and right contacts 34
The distance between them must be greater than the total width of the two parallel tab plates 1', 1'. On the other hand, two connected links 35 are installed between the front ends of the two connecting rods 32. The connecting portion between the connecting rod 32 and the link 35 is located approximately in front of the contactor 34, and is rotatably supported at this position on a vertical shaft 36, with the shaft 36 slightly sliding laterally. The structure is such that it can cope with expansion and contraction of the link length due to bending of the link 35. The connecting portion of the two links 35 is located in front of the midpoint of the contacts 34, 34, and is rotatably supported at this position on a vertical shaft 37, and its bracket 38 is attached to the frame body. It is fixed to the front inner surface.

A contact roller 40 of a second copying member 39 protruding forward from the front plate 22 elastically contacts the rear surfaces of the two links 35 due to the action of the spring 24 . The second copying member 39 is provided so as to be movable in the front and rear directions with respect to the front plate 22 that is its support body, and has a female threaded portion 41 in the front and back direction carved inside thereof. The shaft 43 (male thread) of the fixed motor 42 is rotatably inserted, and the second copying member 3
9 has a structure in which it moves forward and backward independently with respect to the front plate 22. A sensor 44 is provided on the outside of the front part of the frame body to detect the rear end of the connecting rod 32 at a position where the link 35 faces right sideways.

The lower jaw portion 45 of the gripping member 14 is provided with a pipe inner weld bead removal device 46 equipped with a drive mechanism in the front-rear direction (see FIG. 1B). The device described in "Pipe inner surface weld bead removal device" was used.

Next, the operation of the end tab processing device will be explained.

First, in Fig. 1, lock pin cylinder 1
5 is operated to fix the grip member 14 horizontally, the position of the gantry 11 is adjusted in the lateral direction by the motor 12, and the height of the lifting table 10 is adjusted in preparation for processing. In this state, the truck 3 is at the backward limit.

When the straight seam tube 1 is set on the setting line with the seam line facing upward, the cylinder 7 moves from contraction to expansion after adjusting the position of the seam line. This action causes the gears 4, 4 to move forward and at the same time rotation is applied to the rack 6, which causes the rack 5 to move forward. That is, the truck 3 moves a distance twice the rod stroke of the cylinder 7. As the carriage 3 moves forward, the lower jaw part 45 of the gripping member 14 is inserted into the inside of the tube 1, and in the upper jaw part 16, the contacts 34 of the tab plate cutting device shown in FIG. come into contact with.

Now, assuming that the two tab plates 1' and 1' are shifted in the front and back direction as shown in FIG. As a result, the connecting rod 32 is retracted and its rear end passes the sensor 44. Subsequently, the other contact 34 hits the tube end and causes the connecting rod 32 to retreat, and when the rear end passes the sensor 44, the forward movement of the truck 3 is stopped. In other words, the truck 3 stops with the link 35 on the recessed side of the tab plate 1' facing right sideways. It is possible to set the operation of the trolley 3 to second speed, move it forward halfway at high speed, and then switch to low speed to improve stopping accuracy and shorten working time.

When the truck 3 stops, the lock pin cylinder 15 shown in FIG.
operates, and the clamper 48 connected thereto and the clamper 49 provided on the lower jaw portion 45 hold the gripping member 14.
is fixed to the tube end.

When the gripping member 14 is clamped to the tube end portion,
The cylinder 26 shown in FIG. 2 moves from the extended state to the contracted state, and the contact ball 27 of the copying member 28 is elastically pressed against the outer peripheral surface of the tube. In addition, a cutting torch 30
wait at position A in Figure 2.

Here, the movement of the cutting torch 30 will be briefly explained. For lateral movement, the screw shaft 19 is rotated by the drive of the motor 20, and the movable block 18
This is done because of rampant behavior. On the other hand, when moving in the longitudinal direction, the second copying member 39 is constantly pressed against the rear surface of the link 35 by the spring 24, so that the moving block 18 moves forward and backward according to the inclination of the link 35 in the longitudinal direction. conduct. In addition, by driving the motor 42, the amount of protrusion of the second copying member 39 relative to its support body is changed, and a forward and backward movement is performed separately from the above-mentioned forward and backward movement.
The cutting torch 30 is moved into position by only moving the movable block 18 traversely, and by traversing the movable block 18 and driving the motor 42 from then on.

When the copying member 28 is pressed against the outer circumferential surface of the tube, it is preheated in position by the cutting torch 30, which has been ignited in advance with a low-pressure oxygen jet. After this preheating is completed, the motors 20 and 42 are driven to bring the cutting torch 30 to the . Start. From the position to the position, motor 2
The cutting torch 30 is moved only by the horizontal movement of the movable block 18 by driving only the movable block 18. One link 35
is facing directly to the side, but the other link 35
Since the side edge is pulled backward by the contactor 34 and the guide 17 according to the amount of misalignment of the tab plate,
The path from which the cutting torch 30 moves depends on the amount of misalignment of the tab plate 1'.
At the intermediate point between the cutting edge and the bead section, the traverse speed of the movable block 18 is slightly lowered so that the bead section can also be completely cut. In addition, after preheating by blowing out low-pressure oxygen from the cutting torch 30 at the position, the cutting torch 30 is once brought to the position, and here the switch is made to high-pressure oxygen blowing. This is to prevent damage to the tube end that is likely to occur due to oxygen jetting.

When the cutting torch 30 reaches the position, the motors 20 and 42 are driven again to reach the previous position and cutting is stopped.

When cutting is completed, the cutting torch 30 returns to the position , and the cylinder 26 returns to its extended state.

The above-described series of operations of the cutting torch 30 is carried out along the traverse path of the movable block 18 and the second copying member 39.
This can be automated by placing a limit switch in the advance/retreat path of the movable block 18, and furthermore, the operation of temporarily decelerating the movable block 18 at the bead portion can be easily automated by using the limit switch.

The cut tab plate 1 is attached to the chute 5 shown in FIG.
Ejected by 0.

Moreover, after cutting, the cart 3 returns to the backward limit in preparation for the next cutting.

In the actual end tab processing, prior to cutting the tab plate 1', the tube inner surface weld bead removal device 46 of the lower jaw portion 45 operates with the gripping member 14 clamped to the tube end. This operation is described in detail in the ``pipe inner surface weld bead removal device'' filed by the present applicant on the same day.

〔Effect of the invention〕

As is clear from the above description, the end tab processing device of the present invention is capable of purely mechanically and easily detecting the deviation of the tube end and reflecting this in the moving path of the cutting torch. It does not require a computing device, has low equipment cost, and is highly reliable, making it extremely valuable as a practical device.

Furthermore, since the second tracing member is equipped with an independent back-and-forth movement drive mechanism relative to its support, a wide range of movement paths can be selected in addition to the automatic tracing described above. It is possible to prevent the tube end from being damaged due to ejection, and to make the cutting angle of the cutting start and end portions relative to the tube end shallow.

In addition, since the tracing member that supports the cutting torch contacts the outer circumferential surface of the tube at two points in the circumferential direction of the tube, the cutting torch maintains a posture perpendicular to the outer circumferential surface of the tube regardless of its moving position, and the outer circumferential surface of the tube The distance is also kept constant.

Furthermore, by setting the traverse speed pattern of the movable block to be slow at the bead portion and high speed at other portions, complete cutting of the bead portion can be achieved without substantially reducing cutting efficiency.

[Brief explanation of the drawing]

Figures 1A to 1C are a front view (A), a side view (B), a rear view (C), and a rear view (C) of an example of an end tab processing apparatus according to the present invention. Figure 3 is an enlarged front view (Figure A), vertical side view (Figure B), and rear view (Figure C) of the main parts of the tab plate cutting device of the same device, and Figure 3 is the tube after forming. FIG. 4 is a perspective view showing the shape of the tube, and FIG. 4 is a plan view showing the tab plate portion of the tube after welding. In the figure, 1: straight seam pipe, 1': tab plate,
3: Trolley, 4: Cylinder, 10: Lifting platform, 11:
Frame, 12: Motor, 14: Gripping member, 15: Lock pin cylinder, 16: Upper jaw, 17: Guide rod, 18: Movable block, 19: Screw shaft, 20: Drive mechanism (motor) for movable block 18, 24: Spring, 25: Vertical member, 2
6: Pressing means (cylinder), 28: Copying member, 3
0: cutting torch, 32: connecting rod, 33: spring, 34: contact, 35: link, 39: second copying member, 42: forward and backward drive mechanism 42 (motor) of second copying member 39, 44 :Sensor.

Claims (1)

[Claims] 1. A pedestal 11 that can move forward and backward, traverse, and go up and down is arranged on the extension line of the setting line where the straight seam pipe with the tab plate lies with the seam facing up on the extension line of the seam of the pipe end, and the straight seam pipe A gripping member 14 which is clamped to the end of the tube is attached in a state where it is opened towards the end and surrounds the tab plate from above and below, and a movable block 1 that can be moved laterally is attached to the frame which is the upper jaw part 16 of the gripping member 14.
8 and its drive mechanism 20, and the movable block 1
8, a vertical member 25 attached to move back and forth and move forward and backward toward the outer surface of the tube with a pressing means 26; The vertical member 2 has two contact balls 27, 27 and an axis 29 in the tube axis direction.
5 and a downward cutting torch 3 mounted at right angles to a line connecting the contact balls 27, 27 of the copying member 28.
0, a pair of left and right contacts 34, 34 that elastically contact the tube ends on both sides of the tab plate, and both contacts 34, 34.
and parallel to the line connecting both the contacts 34, 34, is pivotably supported in a substantially horizontal plane at a location corresponding to the contacts 34, 34 and their midpoints, and is pivoted so as to be bendable in a substantially horizontal plane. is the upper jaw part 16
is fixed to a frame body, and both the contacts 34, 3
Links 35, 35 are set to form an inclination according to the amount of misalignment of the pipe ends when the link 4 contacts the pipe ends.
, a second tracing member 39 which is a longitudinal tracing member of the links 35 and 35 and is connected to the vertical member 25 so as to be able to move back and forth with respect to the movable block 18; and a second tracing member 39 that supports the tracing member 39. An end tab processing device characterized in that a back and forth drive mechanism 42 for the body is provided, and an upward tube inner weld bead removal device 46 equipped with a back and forth drive mechanism is provided in the lower jaw portion 45.