JPH03281102A - Work device for end face of plastic coating steel pipe - Google Patents

Abstract

PURPOSE:To enable unmanned processing in on-line, by providing the work machine main body having a work head and spacer plate and an automatic chuck device on an end face work device and automatically machining the plastic coating part end face of a steel pipe. CONSTITUTION:This end face work device is composed of the work machine main body 1 having a work head 2 and spacer plate 3 on the front face and an automatic chuck device 8. When the automatic chuck device 8 holds a plastic coating steel pipe 100, the spacer plate 3 and work head 2 start their advance and a bite 22 goes cutting the end face of a plastic coating part while rotating. At this time the spacer plate 3 precedes a bit (0.1mm) from the edge tip position of the bite 22 and goes approaching to the internal part of the plastic coating part. When the processing is progressed, the spacer plate 3 is abutted on the end face of the steel pipe 100 and an elastic pressure slide device 9 pushes the steel pipe 100 against a spring force, the finishing dimension of the coating part end face can be secured within an allowable dimensional difference. The spacer plate 3 and work head 2 are retreated after completion of the work and the chuck device 8 is restored to the original position.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an end face processing device for plastic coated steel pipes, and more specifically, for finishing the end face of a lining part of a plastic coated steel pipe accurately on-line within predetermined dimensions. This article relates to an end face processing device that can be used.

[Prior Art] Plastic-coated steel pipes whose outer surfaces are lined with polyethylene or the like are used for purposes such as weather resistance and corrosion resistance. In order to manufacture such a plastic-coated steel pipe, a steel pipe 1 cut to a regular length as shown in FIG. 5(a) is prepared.
00 are connected with a connecting fitting 101, and this connected steel pipe is passed through a lining device (not shown), and the outer surfaces of the steel pipe 100 and the connecting fitting 101 are continuously coated with plastic. Then the plastic lining part 10
3 is cut at the steel pipe connection part, the connection fitting 101 is removed (FIG. 5(b)), and the end face 104 of the plastic lining part 103 is connected to the end face 105 of the steel pipe 100.
The product is finished within the dimension difference t=0.1m+a (Fig. 5(C)).

[Problems to be Solved by the Invention] However, conventional end face finishing of plastic-coated steel pipes has been carried out manually online due to the strict tolerance of dimensional differences within 0.1 degrees. Therefore, many skilled technicians are engaged in this finishing process, which reduces costs and
Not only was this an issue in terms of efficiency, but it was also a hindrance to unmanned operation.

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, it is an object of the present invention to provide an end face finishing machine for plastic-coated steel pipes by automatic mechanization.

[Means for Solving the Problems] In order to achieve the objective of "2-1," the end face processing apparatus for plastic-coated steel pipes according to the present invention includes a processing machine main body having a processing head and a backing plate on the front surface, It consists of an automatic chuck device that grips the coated steel pipe, and during machining, the backing plate and the machining head maintain a constant longitudinal relationship in the forward direction of the plastic coated steel pipe gripped by the automatic chuck device, that is, the end face of the plastic coated part. The pipe is moved forward while maintaining a relationship such that the finished dimensions are within the above-mentioned allowable dimensional difference, and the caul plate contacts the end face of the steel pipe, and the pressure head presses against the plastic coating located on the outer periphery of the caul plate. In addition, a pressure slide device of an automatic/Q) chuck device is provided to counter the pressing force against the steel pipe by the backing plate.

[Operation] When the automatic chuck device grips the plastic-coated steel pipe, the caul plate and the machining head start moving forward, and the cutting tool of the machining head rotates to cut the end face of the plastic-coated portion. At this time, the backing plate advances slightly (0.1+nm) from the position of the cutting edge of the cutting tool and enters into the inside of the plastic coating.

As the processing progresses, the patch plate finally comes into contact with the end face of the steel pipe, and by pushing the steel pipe a little against the spring force of the elastic slide device, the finished dimensions of the end face of the plastic coating can be ensured within the above-mentioned tolerance. .

After the machining is completed, the caul plate and the machining head move back, and when the pressing force from the caul plate is released, the automatic chuck device returns to its original position by the elastic slide device, and begins a preparatory operation for the next machining.

[Example] Fig. 1 is a partially sectional side view showing an embodiment of a processing device according to the present invention, Fig. 2 is a front view of an automatic chuck device, and Fig. 3 is an enlarged IF view of a processing head and a backing plate. , Figure 4 is the third
FIG.

In the figure, 1 is the processing machine main body, 2 is the processing head attached to the front of the machine main body 1, and consists of one cutting tool 22 attached to the circumference of the face plate 21. It is attached to the tip of the shaft 23. 3 is a backing plate, and the shaft 3 is rotatably supported within the hollow rotating shaft 23.
It is attached to the tip of 1, and the backing plate 3 and bite 22
As shown in FIG. 4, the relationship between the positions of the cutting edges is such that the front surface 32 of the backing plate 3 protrudes from the cutting edge position 24 of the cutting tool 22 by 0.1 mm. The outer diameter of the backing plate 3 is formed to be slightly smaller than the inner diameter of the plastic covering portion 103 to be pressurized.

The rotary ring 23 to which the machining head 2 is mounted is pivotally supported by a slide block 4 via a bearing 41, and the slide block 4 is connected to a machining feed cylinder 5. Machining feed stroke is 22 bites or 1 plastic coated steel pipe.
Distance to return to the position where there is no interference with the conveyance of 00 [7]. Further, the base end of the rotating shaft (4) 23 is connected to a drive motor 7 via a gear transmission mechanism 6.

Reference numeral 8 denotes an automatic chuck device connected to the front surface of the processing machine main body 1, and is slidably supported by an elastic slide device 9.

As shown in FIG. 2, the automatic chuck device 8 consists of a pair of V-shaped chucks 81 that can be opened and closed left and right, and a V-shaped block 82 that supports the lower part of the plastic-coated steel pipe 100. The pair of chucks 81 are used for opening and closing the chucks. cylinder 83
A link mechanism 84 connected to the guide shaft 85 simultaneously opens and closes the left and right sides of the guide shaft 85. The lower or lower V-block 82, which is provided at a different position in the tube axis direction than the chuck 8], can be adjusted up and down with a manual screw jack (not shown), which allows the steel pipe 1. O
Align the center of O with the center of processing head 2. The pair of link mechanisms 84 includes a first link 84a whose one end is connected to a connecting member 86 at the tip of the rod of the chuck opening/closing cylinder 83, and a first link 84a whose intermediate portion is pivotally supported by a support block 8'7, and a first link 84a whose intermediate portion is pivotally supported by a support block 8'7. The first link 84a and the second link 84b are connected to the chuck 81 by a pin.

Furthermore, a pair of adjustment devices 11 for the chucks 81 are provided on one side of the guide shaft 85, and one end of the guide shaft 85 can be rotated with a tool to operate a gear mechanism]]1 and a screw mechanism 112.
Through this, the pair of chucks 81 can be finely adjusted simultaneously in left-right symmetrical directions.

The elastic slide device 9 that supports the automatic chuck device 8 is composed of a pair of guide shafts 91 that slidably support the support block 87, and a spring 92 that always biases the support block 87 toward the processing machine body. ing.

Next, the operation of this embodiment configured as described above will be explained.

First, when the plastic-coated steel pipe 100 that has been run and cut at the aforementioned steel pipe joint is carried into the chuck 81 by a walking beam mechanism (not shown), the proximity switch (
The automatic chuck device 8 closes in response to a signal (not shown), and the outer end surface (7) of the steel pipe 100 is clamped by a pair of chucks 81. The walking trajectory of the carry-in operation is indicated by reference numeral 106 in FIG. Further, the steel pipe 100 is supported on a plurality of V-shaped rollers (not shown).

Processing head 2 continuously rotating at the same time as line start
starts moving forward while rotating toward the steel pipe 100 gripped by the automatic chuck device 8 together with the backing plate 3, and moves forward in rapid traverse until it reaches a predetermined position. When approaching the end face of the steel pipe, the speed controller (flow rate adjustment valve of the machining feed cylinder 5) 12 shown in Fig. 1 is activated, and the machining head 2
moves forward.

With this cutting feed, the cutting tool 22 of the processing head 2 is made of steel pipe 100.
The end face 10 of the plastic covering part 103 is more protruding
Cut out 4. At the same time, the caul plate 3 enters into the plastic covering portion 103.

As the cutting progresses, the backing plate 3 finally comes into contact with the end face 105 of the steel pipe 100 and pushes it somewhat further.

The relationship between the backing plate 3 and the cutting edge position 24 of the cutting tool 22 is as follows. This ensures the finished dimension of the end surface of the covering part (see Fig. 5(C)).The automatic chuck device 8 receives the pressing force of the backing plate 3 and pushes the spring 92 of the elastic slide device 9 while compressing it. The finishing process of the end face 104 of the plastic covering part is completed when the plastic covering part end face 104 is pushed to this predetermined position.

When the finishing process is completed, the forward end limit switch 1 in Figure 1 is activated.
3 works, and the processing head 2 and the backing plate 3 rapidly retreat. This backward movement is stopped by the operation of the backward end limit switch 14. Since the above-mentioned pressing force is released by the retreat of the backing plate 3, the automatic chuck device 8
The automatic chuck device 8 is then opened and the finished product is carried out again by the walking beam mechanism. At the same time, the next plastic-coated steel pipe 100 is carried into the automatic chuck device 8, and the above finishing process is repeated.

In the second embodiment, processing of one end of a plastic-coated steel pipe has been described, but it goes without saying that by arranging this apparatus at both ends, finishing processing can be performed alternately on both ends of the plastic-coated portion.

[Effects of the Invention] As described above, according to the present invention, a processing machine main body having a processing head and a backing plate, and an automatic chuck device for gripping a plastic-coated steel pipe are provided, and the end face of the plastic-coated portion of the steel pipe is automatically clamped. By using machining, efficiency is significantly improved and unmanned online processing becomes possible.

Furthermore, the backing plate is made to protrude by a predetermined distance from the position of the cutting edge of the processing head, and during processing, the processing head and the backing plate move forward while maintaining this positional relationship, and the end face of the plastic coating is cut with the cutting tool of the processing head. The end of finishing is determined when the plate finally comes into contact with the end face of the steel pipe and pushes the automatic chuck device against the spring force of the elastic slide device, so the end face of the plastic coating can be accurately adjusted within a predetermined dimensional difference. This has the effect of being able to finish the process.

[Brief explanation of drawings]

FIG. 1 is a partially sectional side view showing an embodiment of a processing device according to the present invention, FIG. 2 is a front view of an automatic chuck device, FIG. 3 is a front view of a processing head and a backing plate, and FIG. 4 is a front view of an automatic chuck device. The side view of FIG. 3 and FIGS. 5(a) to 5(C) are explanatory diagrams showing the process of processing the end face of a plastic-coated steel pipe. 1... Processing machine body 2... Processing head 3... Backing plate 8... Automatic chuck device 9... Pressure slide device 21... Face plate 22... Bit 100... Steel pipe 103.・Plastic covering part

Claims (1)

[Claims] A processing machine main body, an automatic chuck device disposed opposite to the processing machine main body, and a plastic-coated steel pipe gripped by the automatic chuck device move forward while maintaining a constant back-and-forth relationship in the forward direction during processing. a processing head that is attached to the processing machine body and has a backing plate that comes into contact with the end face of the steel pipe and a cutting edge located a predetermined distance behind the front surface of the corresponding plate;
An end face processing apparatus for a plastic-coated steel pipe, comprising a pressure slide device of the automatic chuck device that opposes the pressing force of the backing plate.