JPH0753297B2 - Pipe end processing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is, for example, a preferred example in which the end of a steel pipe or the like having an outer diameter of several tens of mm or more is diverged (Fig. 1 (a)) or dent ( The present invention relates to a method and an apparatus for processing the shape shown in FIG.

[Prior art] Conventionally, the tip of the pipe end is diverged, the shape of the concavity is (A) The method of pushing the die according to the processing shape in the axial direction of the pipe (B) Dividing the die according to the processing shape (tube axis) direction)
Then, the method of pushing or expanding the tube concentrically to the tube axis at a predetermined position on the tube end (C) Method of holding a small part of the tube end and bending it little by little (Reference Technology JP-B-60- 18261).

[Problems to be Solved by the Present Invention] By the way, in the methods (A) and (B), since the entire circumference is processed simultaneously, a large pressing force is required, and at the same time, in the case of the divergence, a crack is generated at the pipe end. However, the degree of processing was limited because of the problems such as the occurrence of wrinkles due to buckling in the case of dents and the occurrence of blunting. As for (C), naturally, it does not become a clean circle after processing. Therefore, it was not suitable for application to a double pipe production line that seals high pressure using the processed end (Reference: Japanese Patent Publication No. Sho 60-18261).

[Means for Solving Problems] The present invention has been made to solve all of the above-mentioned conventional problems, and a carriage that is movable in the axial direction of a pipe on a processing machine body that chucks and rotates the pipe. And a saddle movable on the upper surface of the carriage in a direction orthogonal to the pipe axis, a processing roller and a receiving roller that match the processing shape of the pipe end portion are provided on the saddle, and further processing is performed on the receiving roller. It is a pipe end processing device provided with an actuator for moving a roller close to or retracting.

As a result, a processing roller that matches the processing shape is gradually pressed against the end of the tube that is being chucked and rotated by the processing body, and the processing is continuously advanced to clean it with a relatively small pressing force. A pipe end shape is obtained.

[Examples] Details of the present invention will be described in detail below with reference to examples.

FIG. 2 shows an apparatus according to an embodiment of the present invention.

In FIGS. 2A and 2B, the pipe 1 is chucked by the processing machine body 2 and rotates as shown by an arrow R.

The carriage 3 is provided so as to be freely movable on the main body of the processing machine as shown by an arrow S, and is moved by a driving device (not shown). A movable saddle 4 is installed on the carriage 3 as shown by a directional arrow T orthogonal to the tube axis, and is moved by a driving device (not shown).

A receiving roller 5 is rotatably attached to the saddle 4 in parallel with the tube axis, and a processing roller 6 is also rotatably attached in parallel with the axis of the receiving roller 5, and the actuator 7 moves the arrow in the direction of arrow U. You can move to. Further, the positional relationship between the receiving roller 5 and the processing roller 6 in the pipe axis direction is such that the processing roller 6 is disposed on the pipe end side and the receiving roller 5 is disposed on the back side of the pipe, the wall thickness t of the pipe to be processed, and the processing angle. The relative position can be adjusted by α (the shaft of the receiving roller 5 is movable in the axial direction).

Next, a processing example of the pipe end portion according to the present invention will be described.

First, the case of bending into a tapered shape as shown in FIG. 1B will be described. In FIGS. 2A and 2B, the pipe 1 is chucked on the main body 2 of the processing machine and continuously rotated in the direction of arrow R. Then, the carriage 3 and the saddle 4 are adjusted to bring the receiving roller 5 into contact with the inner wall of the tube 1 so that the receiving roller 5 is rotated by the rotation of the tube 1. Next, when the actuator 7 is driven and the processing roller 6 is gradually advanced in the direction of the arrow U'in FIG. 2 (c), the processing roller 6 comes into contact with the end of the tube 1 and is rotated by the rotation of the tube 1. To start. Further, by gradually advancing the processing roller 6 in the direction of the arrow U ′ by a certain distance, the pipe end is processed into a concave shape as shown by γ in FIG. 2 (b) in combination with the action of the receiving roller 5. can do.

The bending angle α of the pipe end at this time is determined by the bevel angle α ′ of the processing roller (FIG. 2 (c)).

The case of bending into a divergent (trumpet-like) shape as shown in FIG. 1 (a) will be explained. As shown in FIG. Continuous rotation in the direction of, and further adjusting the carriage 3 and the saddle 4 to bring the receiving roller 5 into contact with the outer wall surface of the end of the pipe 1,
The receiving roller is rotated by the rotation of the tube 1, and the processing roller 6 is positioned on the inner wall side of the tube 1. Next, when the actuator 7 is driven and the processing roller 6 is gradually advanced in the direction of the arrow U, the processing roller 6 comes into contact with the end portion of the tube 1 and follows the rotation of the tube 1 to start rotation. Then, by further advancing the processing roller 6 in the direction of the arrow U by a certain distance, the pipe end portion is expanded outward from the inner wall of the pipe 1 and the pipe end portion is opened in cooperation with the action of the receiving roller 5. First
Bending can be performed in a flared shape as shown in FIG.

The bending angle α ₀ of the pipe end at this time is determined by the bevel angle α ′ of the processing roller 6 (FIG. 2 (c)).

[Effects of the Invention] As described above, according to the present invention, it is obvious that the pipe end portion widening process or the tapered process is continuously and gradually performed, so that the process is extremely smooth.

Therefore, it is extremely advantageous in the case where the pressure inside the pipe is sealed by utilizing this divergent or tapered portion (in the case of manufacturing a double pipe, etc.). Further, since the processing is carried out continuously and gradually, the force and power required for the processing are small, so that the processing machine is small and can be manufactured at a low cost.

[Brief description of drawings]

FIG. 1 is a longitudinal cross-sectional explanatory view showing a bent shape of a pipe end obtained by the present invention, and FIG. 1 (a) shows a case of a tapered shape,
The figure (b) shows the case of the shape which spreads out. FIG. 2 is an explanatory view of an embodiment of the present invention, FIG. 2 (a) is a side view showing an embodiment of the pipe end processing apparatus of the present invention, and FIG.
The figure shows a partially cutaway top view showing an example of the processing state when processing the pipe end into a concave shape in the figure (a), and (c) shows an example of the tube end processing start state in the figure (b). Partially cutaway upper surface explanatory view, (d) is a partially cutaway upper surface explanatory view showing an example of a processing state in the case of processing the pipe end portion into a divergent shape in FIG. 1 ... Pipe, 2 ... Processing machine main body 3 ... Saddle, 4 ... Reciprocating table 5 ... Receiving roller, 6 ... Processing roller 7 ... Actuator

Claims (1)

[Claims] 1. A reciprocating carriage movable in the axial direction of the pipe, and a saddle movable on the upper surface of the reciprocating carriage in a direction orthogonal to the pipe axis, are provided in a main body of a machine that chucks and rotates the pipe. A pipe end processing apparatus, characterized in that a saddle is provided with a processing roller and a receiving roller adapted to the processing shape of the pipe end, and further an actuator for bringing the processing roller close to or retracting from the receiving roller.