JP2735954B2 - Milling type traveling steel pipe cutting machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a milling type traveling steel pipe cutting machine for cutting a pipe to be cut while rotating a milling cutter, and more particularly to a safety device therefor.

[0002]

2. Description of the Related Art Japanese Patent Publication No. Sho 62-279 discloses a steel pipe cutting machine.
No. 26 (steel pipe cutting machine equipped with revolving type milling cutter) and Japanese Patent Publication No. 62-74525 (pipe cutting control method) as a related application are proposed.
The outline is shown below.

As shown in FIGS. 11 and 12, a plurality of cutter heads 102 each having a milling cutter 101 which rotates in an up-cut direction are supported by a rotating ring via a rotating shaft 103. This rotating ring is the tube 1 to be cut.
The motor 105, the gears 106 and 107, and the worm gear 10
8, through the worm wheel 109, the ring gear 110 and the like.

[0004] The cutter head 102 is capable of oscillating movement of arc arrows θ ₁ and θ ₂ in order to keep the cutting amount constant, and the bogie on which the cutting machine is mounted is synchronized with the line speed. When the vehicle travels at the same speed, the tube 104 to be cut is clamped by a clamping device (not shown), and the tube 104 to be cut is simultaneously cut by a plurality of milling cutters 101 by a series of operations of the revolving motion and the swinging motion. As the cutting control, the outer diameter, wall thickness, and maximum cutting thickness of the pipe to be cut 104 are input to a computer in advance, and the revolving position and the revolving speed, the oscillating position, and the oscillating speed of the milling cutter 101 are interlocked and controlled. Cutting thickness and milling cutter 101
The cutting is performed such that the amount of protrusion from the wall thickness is always constant.

[0005]

The conventional milling-type traveling steel pipe cutting machine described above is a steel pipe cutting machine that performs revolving and oscillating motions. When calculating the locus position of the milling cutter 101, it uses polar coordinates. Therefore, there is a problem that the calculation and control of the trajectory position are complicated even in the case of a square tube having a simple shape.

In addition, since the structure is such that the cutting reaction force of the milling cutter 101 is received only by the rotating shaft 103, the rigidity is poor and the inertial mass is not easily large. Since the cutting is an intermittent cutting, the vibration of the cutter head 102 increases, the thickness of the chips cannot be increased, and the life of the blade is short. In addition, since the plurality of cutter heads 102 are synchronously rotated by the revolving ring (ring gear 110), it is impossible to cut an asymmetrically deformed pipe under the same conditions.

[0007] Further, when the machine is operated, the operator can cut the pipe 1 to be cut.
If the cutting conditions such as the shape and dimensions of the cutter 04 are erroneously input, there is a problem that the cutter head 102 and the pipe 104 to be cut or the cutter heads 102 collide with each other.
In addition, the collision also occurs due to disconnection of a control wire while the cutter head 102 is moving.

[0008] The collision damages the device and requires repair, and the line must be stopped, which causes a great deal of damage and lowers productivity.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide a milling type traveling steel pipe cutting machine in which control is simplified, collision is prevented and productivity is improved. With the goal.

[0010]

A milling type traveling steel pipe cutting machine according to the present invention for achieving the above object is a traveling steel pipe cutting machine which cuts a pipe in synchronization with a pipe forming speed.
A clamp device for holding the pipe to be cut, a plurality of cutter heads movable in two directions perpendicular to the running direction of the pipe to be cut and perpendicular to each other, and each of the plurality of cutter heads is rotatably supported by the plurality of cutter heads; With a milling cutter,
A detecting member provided on the cutter head for detecting collision between the cutter head and an obstacle in advance, and controlling the driving of the cutter head based on the cutting condition input data of the pipe to be cut and the detection result of the detecting member. And a safety control device.

[0011]

According to the present invention, a plurality of cutter heads independently operate on a pipe to be cut held by a clamp device based on cutting condition input data. Cut the tube. When the cutter head attempts to collide with an obstacle, the detecting member detects the collision in advance, and the safety control device retracts the cutter head from the obstacle based on the detection result.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIGS. 1 and 2 show a cutter head of a milling cutter type traveling steel pipe cutting machine according to an embodiment of the present invention, FIG.
And FIG. 4 shows a touch sensor device, FIGS. 5 and 6 show a cutting machine,
FIG. 7 shows a flowchart of the control, and FIG. 8 shows an operation state thereof.

In the milling type traveling steel pipe cutting machine according to the present embodiment, as shown in FIGS. 5 and 6, the traveling carriage 11 is supported movably in synchronization with the traveling direction of the pipe 12 to be cut. The traveling carriage 11 has a running pipe 12 to be cut.
A pair of first cutter heads 13 facing the upper and lower positions of
A first cutter head 13 and a second cutter head 14 are movable in two directions perpendicular to the running direction of the pipe 12 to be cut and perpendicular to each other. That is, the first and second cutter heads 13 and 14 each have a built-in drive gear (not shown), and each head drive motor 15 moves vertically (Y-axis direction), and each head drive motor 16 moves left and right (X-axis direction). Direction) can be independently moved.

A first milling cutter 17 and a second milling cutter 18 are rotatably supported by the first cutter head 13 and the second cutter head 14, respectively.
The cutters can be driven and rotated by cutter drive motors 19 and 20 mounted on the second cutter heads 13 and 14, respectively.

The first and second milling cutters 17,
In the vicinity of 18, before and after clamping the tube 12 before and after the first and second milling cutters 17, 18 in order to suppress vibration during cutting of the tube 12 to be cut and perform stable cutting. A pair of clamping devices 21 and 22 are provided.

The cutting machine of the present embodiment has a control device 23.
Is connected. The control device 23 has a function of determining a cutter peripheral speed, a cutter trajectory, a cutter feed speed, and the like by inputting cutting condition data such as a shape and a size of the pipe to be cut 12, a cutting length, and the like. 15,16
And controls the driving of the cutter drive motors 19 and 20.

As shown in FIG. 5, the first and second cutter heads 13 and 14 are provided with first and second cutter heads 13 and 14 and obstacles, for example, these cutter heads 13 and 14 or between them. A first detection member 31 and a second detection member 32 for detecting a collision with the tube to be cut 12 and the like are provided, respectively. The first and second detection members 31 and 32 serve as safety devices 3 for controlling the driving of the first and second cutter heads 13 and 14 based on the detection results.
3 is connected, and the safety device 33 is connected to the control device 23.

As shown in FIGS. 1 and 2, first and second
First and second milling cutters 17, 18 are mounted on the front side of the head cutters 13, 14, while first and second detection members 31, 32 are mounted on the rear side. The first and second milling cutters 17 and 18 are attached to the outer peripheral edges of the first and second detection members 31 and 32 such that the outer peripheral edges of the first and second milling cutters 17 and 18 project outward.

The first detecting member 31 will be described with reference to FIGS.
And the second detection member 32 will be described, but since both have substantially the same structure, only one will be described.

As shown in FIGS. 3 and 4, the first detecting member 31 is a touch sensor device,
A mounting plate 34 for mounting the detection member 31 is fixed to the mounting plate 34 and has a substantially circular shape in a plan view. The mounting plate 34 is integrally formed with a U-shaped support portion 35.
On the other hand, the touch sensor 36 in which the main body itself has elasticity is U
It is shaped like a letter, and is fixed to the outer periphery of a U-shaped support plate 38 by small screws 37. The support portion 35 and the support plate 38 are connected to each other by a plurality of support bolts 39 so as to be able to approach and separate from each other, and are urged in a direction away from each other by a plurality of springs 40 wound around the outer periphery of the support bolt 39. Have been. Guide plates 41 and 42 are attached to the support portion 35 and the support plate 38, respectively, to prevent the touch sensor 36 from falling down.

The operation of the milling type traveling steel pipe cutting machine according to the present embodiment will be described with reference to the flowchart of FIG.

As shown in FIG. 7, first, in step S1, cutting conditions such as the shape and size of the pipe, the cut thickness, and the cut length of the pipe are input to the controller 23. In step S2, the control device 23 calculates the peripheral speed, trajectory, feed speed, and the like of each cutter based on the input data, and prepares for cutting.

When the pipe to be cut 12 travels, step S3 is performed.
In step S4, the traveling carriage 11 is synchronously controlled such that the cutting length of the pipe to be cut 12 becomes the set length in step S4.
When the tube to be cut 12 and the traveling vehicle 11 have the same speed, in step S5, the vicinity of the cutting point of the tube to be cut 12 is pressed and clamped by the clamp devices 21 and 22. In steps S6 and S7, as shown in FIG. 8A, the first and second milling cutters 18 and 19, which are driven and controlled in the downcut direction at the set cutter peripheral speed, simultaneously and independently use the X and Y axes. Is controlled. The first and second milling cutters 17 and 18 are connected to the pipe 1 to be cut.
2, the first milling cutter 17 moves and cuts from A to A ', as indicated by the arrow in the drawing, while the second milling cutter 18 moves and cuts from B to B'.
And move to disconnect.

As shown in FIG. 8 (b), even when the pipe to be cut is a pipe to be cut 51 having a rectangular cross section, the first milling cutter 17 is A → A ′ → A ″ and the second milling cutter 1
8 is independently fed biaxially in the order of B → B ′ → B ″
Cut 1

Then, in step S8, the first and second detecting members 31, 32 are connected to the first and second cutter heads 1 and 2.
If collision between the obstacles 3 and 14 and the obstacle is not detected, the cutting is completed in step S9. Thereafter, in step S10, the clamp devices 21 and 22 unclamp the pipe 12 to be cut. Returns and prepares for the next cut. Thereafter, if there is a change in each set value in step S12, the process proceeds to step S1,
If not, the process proceeds to step S4.

In step S1 described above, when the operator erroneously inputs the cutting conditions such as the shape and dimensions of the pipe, as shown in FIG. 1 and FIG.
Thus, the first and second cutter heads 13 and 14 are driven and controlled by recognizing the pipe 52 to be cut having a small diameter. Then, the first and second cutter heads 13 and 14 try to collide with the actual cutting tube 12 during the cutting operation. However, in the present embodiment, the first and second detection members 31 and 32 come into contact with the tube to be cut 12. At this time, the touch sensor 36 is buffered by the spring 39 and outputs a result of the abnormality detection to the safety device 33.

That is, as shown in FIG. 7, in step S8, the first and second detection members 31, 32 are set to the first and second detection members.
When the collision between the cutter heads 13 and 14 and the pipe to be cut 12 is detected in advance, the process proceeds to step S13. Here, the stabilizing device 33 outputs a retreat signal of the first and second cutter heads to the control device 23, and the control device 23 controls the driving of the cutter driving motors 15 and 16 to control the first and second cutter heads 1.
The feed cutting control of 3, 14 is stopped. Then, in step S14, the first and second cutter heads 13, 14
The (first and second milling 17, 18) is retracted, an alarm is generated in step S15 to notify the operator of the abnormality, and the pipe making is stopped in step S16.
Therefore, the first and second cutter heads 13 and 14 can be emergency stopped before the collision, whereby the cut pipe 12 can be stopped.
And the first and second cutter heads 13 and 14, the first and second cutter heads.
The breakage of the milling cutters 17 and 18 can be prevented.

FIGS. 9 and 10 show a cutter head of a milling type traveling steel pipe cutting machine according to another embodiment of the present invention.

As shown in FIGS. 9 and 10, in this embodiment, lever type limit switch devices 61 and 62 are used as the detecting members instead of the above-mentioned touch sensor devices.
That is, the limit switch 64 is fixed to the first and second cutter heads 13 and 14 by the mounting bracket 63, and the lever 65 is connected to the first and second milling cutters 1.
It is curved along the outer peripheral edge of 7, 18 and is located inside.

When the lever 65 contacts an obstacle such as the pipe 12 to be cut, the limit switch 64 detects this and outputs it to the safety device 33. Then, the safety device 33 controls the driving of the first and second cutter heads 13 and 14.

Note that the control flow of this embodiment is almost the same as that of the above-described embodiment, and the description is omitted.

Further, the present invention is not limited to the above-described embodiment, and various changes can be made without departing from the gist of the present invention.

[0034]

As described above in detail with reference to the embodiments, according to the milling type traveling steel pipe cutting machine of the present invention, a clamp device for holding a pipe to be cut and a plurality of movable steel tubes which are movable in directions perpendicular to each other. Cutter head, a milling cutter provided on the cutter head, a detecting member for detecting collision between the cutter head and an obstacle in advance, and a safety for driving and controlling the cutter head based on cutting conditions and detection results of the detecting member. With a control device, a plurality of cutter heads operate independently with respect to the held pipe to be cut, so that cutting is performed while expressing the cutter trajectory in rectangular coordinates,
The deformed pipe can be cut, and the calculation and control program can be created in a short time, thereby simplifying the control.

Further, for example, when an abnormality is generated due to an erroneous input of a cutting condition by an operator and the cutter head collides with an obstacle, it is detected and controlled in advance so that the cutter head is retracted. By preventing damages due to the collision of the milling cutter and the pipe to be cut, etc., safety can be improved and productivity can be improved.

[Brief description of the drawings]

FIG. 1 is a front view of a cutter head of a milling type traveling steel pipe cutting machine according to one embodiment of the present invention.

FIG. 2 is a side view of the cutter head.

FIG. 3 is a front view of a detection member.

FIG. 4 is a cross-sectional view (a cross-sectional view along the line AA in FIG. 3) of the detection member.

FIG. 5 is a front view of the cutting machine.

FIG. 6 is a side view of the cutting machine.

FIG. 7 is a flowchart of control.

FIG. 8 is an operation explanatory view of the milling cutter.

FIG. 9 is a front view of a cutter head of a milling type traveling steel pipe cutting machine according to another embodiment of the present invention.

FIG. 10 is a side view of the cutter head.

FIG. 11 is a partially cutaway front view of a conventional cutting machine.

FIG. 12 is an explanatory diagram of pipe cutting by a conventional cutting machine.

[Explanation of symbols]

REFERENCE SIGNS LIST 11 traveling cart 12 pipe to be cut 13 first cutter head 14 second cutter head 15, 16 head drive motor 17 first milling cutter 18 second milling cutter 19, 20 cutter drive motor 21, 22 clamp device 23 control device 31 first Detection member 32 Second detection member 33 Safety device 36 Touch sensor 61, 62 Lever type limit switch device (Detection member)

Continuation of front page (56) References JP-A-3-221311 (JP, A) JP-A-59-118308 (JP, A) JP-A-59-81015 (JP, A) JP-A-52-62789 (JP) , A) JP-A-62-74525 (JP, A) JP-B-62-27926 (JP, B2)

Claims (1)

(57) [Claims] 1. A traveling steel pipe cutting machine which cuts a pipe in synchronization with a pipe forming speed, comprising: a clamping device for holding a pipe to be cut; and a clamp device for holding the pipe to be cut in two directions orthogonal to a running direction of the pipe to be cut and to each other. A plurality of movable cutter heads, a milling cutter supported by the plurality of cutter heads so as to be driven and rotatable, and a detection member provided on the cutter head and configured to detect a collision between the cutter head and an obstacle in advance. And a safety control device for controlling the driving of the cutter head based on the cutting condition input data of the pipe to be cut and the detection result of the detecting member.