JP4596439B2 - Pipe end machining tool - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a so-called tube forming tool for tube forming, in which a flange is formed by expanding a tube end of a tube using a roller tool. A pipe end machining tool that can be tapped and formed by attaching a tool configured using a roller pressing mechanism to a general-purpose machine and bending the pipe end perpendicular to the pipe axis in one step to form a flange. It is about.
[0002]
[Prior art]
Piping is used in various fields such as for fluid transportation and for structural members, and roller tools have been used for joint flange joint processing and pipe end flare processing for heat exchangers. In particular, in the tube forming process by bending the pipe end portion at a right angle, the initial flare processing is performed as the first step to make the expansion angle of the tube end portion 30 to 120 degrees, and then the expansion angle of the tube end portion is increased. Two-stage processing was performed in which a second step of expanding 180 degrees, that is, perpendicular to the tube axis, was performed.
[0003]
FIG. 2 shows a work procedure related to a conventional rib forming process. The initial flare processing in the first step is to hold the tube 1 with the clamp jig 2 and include a conical frame 24a as shown in FIG. This is performed using a flaring roller tool head in which a plurality of rolling rollers 25a are arranged on the conical surface of the frame 24a. Further, the bending process of expanding at a right angle in the second step includes a cylindrical frame 24b as shown in FIG. 2 (b) at the tip of the main body 23b provided with a rotation drive unit, and the flat end surface of the frame 24b. This is performed by using a right angle bending roller tool head on which a plurality of rolling rollers 25b are arranged, and finally, a tread forming part 26 is formed in these two steps.
[0004]
Further, in order to automate the above-described two processes, a hydraulically driven swallow forming apparatus equipped with two types of processing heads has been developed particularly for flange processing of large diameter steel pipes. The two types of machining heads are a one-stage machining head that employs a small-diameter conical roller having a small expansion angle used for initial flare processing, and a right-angle expansion angle used for final right-angle bending. And a two-stage machining head that employs a large-diameter conical roller, and each head is placed next to each other and disposed in one machining apparatus. In this processing apparatus, the two types of processing heads are switched by a processing head switching cylinder so as to automatically perform two steps of flare processing and right-angle bending processing.
[0005]
[Problems to be solved by the invention]
The conventional rib forming process uses two types of tools or processing heads to perform two processes, flare processing and right-angle bending, to reduce the processing load and eliminate damage to the processing surface and cracks at the end of the tube. This is a safe processing method. However, on the other hand, there is a problem that the work efficiency and the machining efficiency are poor because it requires time for exchanging tools and machining heads. Furthermore, in order to automate the two steps, there has been a problem that it becomes an expensive large processing machine, which is costly and low in versatility.
[0006]
The present invention has been made in view of the above-described problems, and can be attached to a general-purpose machine such as a drilling machine or a lathe. In addition, the tube end is formed by a right-angle bending process in one step. It aims at providing a pipe end part processing tool.
[0007]
In order to solve the above-described problem, a pipe end portion processing tool according to the invention described in claim 1 is provided with a shank connected to the rotation drive unit, a frame locked to the shank, and the frame. In one or more tube end expanding rollers and a tube end processing tool provided with a mandrel inside the frame, the mandrel is rotatably held inside the frame via a bearing, and the tube end expanding roller includes: substantially to the frame slant tapered portion roller groove drilled in the a rotation freely interposed 3 or more radially expanding at right angles to the pipe end portion to the tube axis in the middle portion of the pipe end expanding rollers forming a recessed portion having an angle of 120 degrees, characterized by arranging the rollers at both ends outer peripheral surface other than the recess so as to be in contact with the can press the tapered outer peripheral surface of said mandrel.
[0008]
[Action]
According to the first aspect of the present invention, the use of a specially-shaped roller for expanding the tube end portion enables the bending and bending process in one step, and the tube end expanding mechanism by the roller adopting the planetary roller method. By rolling the end of the tube, plastic working can be performed gradually, and the finished surface can be made very smooth. In addition, since the present invention is a tool arranged at the tip of processing, it is configured to be easily attached to a general-purpose machine such as a drilling machine or a lathe, and the production cost is also low.
[0009]
Furthermore, since the roller is configured to receive the pressure received from the tube by the mandrel, and the bearing is arranged so that the mandrel rotates smoothly, the roller rotates smoothly without slipping with the tube.
[0010]
In addition, the shape and dimensions of the indented part with an angle of approximately 120 degrees formed on the pipe end expansion roller are related to the dimensions of the pipe, the protruding part, the dimensions of the tool itself, and other factors. Needless to say, various modifications are possible.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a tube end machining tool according to the present invention, and is an overall front view in which an upper half represents a cross section and a lower half represents an appearance.
[0012]
The tube end processing tool 10 includes a large-diameter disk-shaped shank 3 having a round bar member 3a attached to a spindle part of a rotary drive machine (not shown) such as a drilling machine, and a round bar member 3a of the shank 3. And a cylindrical portion fixed to the outer peripheral edge portion 3b of the large-diameter disk-shaped shank by a hexagon socket head bolt 9 and a conical portion having a substantially trapezoidal cross section at the tip portion following the cylindrical portion. The hollow frame 4 formed, a tube end expanding roller 5 interposed in a roller groove formed in the inclined taper portion of the frame 4 so as not to drop out of the frame, and the tube end expanding roller 5 The outer peripheral surfaces 5a and 5b formed at both ends of the guide frame 6a, the guide taper surface 6a in contact with the inside of the hollow frame 4, and the stepped flange portion 6b formed at the rear (right side of the drawing) following the guide taper surface 6a Mandrel 6 and the mandrel 6 Needle-like thrust bearings 7 a and 7 b arranged so as to sandwich the flange portion, an inner surface of an annular groove portion 6 c formed inside the mandrel 6, and a protrusion protruding inside the frame 4 of the disc portion of the shank 3 It is comprised with the ball bearing 8 interposed between the outer surfaces of the part 3c.
[0013]
The tube end expanding roller 5 has a conical shape with a substantially trapezoidal cross section, and an annular recess portion 5c having an angle of approximately 120 degrees is formed at an intermediate portion thereof. The end surface portion of the tube 1 is applied to the indented portion 5c, and plastic processing for gradually expanding the tube end portion by rotation and pressing of the roller is performed. In consideration of the uniform processing load and the life due to wear as the number of rollers, a total of three rollers are arranged radially every 120 degrees on the guide taper surface 6a of the mandrel 6, or more are arranged radially. . Further, a shaft provided with a support shaft that penetrates the roller and a bearing is also effective for obtaining stable rotation.
[0014]
The rotation operation of the tube end machining tool 10 will be described. First, the shank 3 is rotated by a rotary drive machine. Since the frame 4 is locked to the shank 3 at its cylindrical portion, the frame 4 rotates in accordance with the rotation of the shank 3. Since the roller 5 is interposed in the roller groove portion of the frame 4, the roller 5 rotates as the frame 4 rotates. On the other hand, the mandrel 6 is rotatably held inside the frame 4 by a ball bearing 8 and needle-like thrust bearings 7a and 7b. Since the tapered outer peripheral surface formed at both ends of the roller 5 and the guide tapered surface of the mandrel 6 are arranged in contact with each other to roll the roller 5, the mandrel in which the rotation of the roller 5 is held rotatably. 6 is transmitted. The mandrel 6 is smoothly rotated by the ball bearing 8 and the needle-like thrust bearings 7a and 7b to assist the rotation of the roller 5.
[0015]
That is, since the roller 5 performs a planetary motion that revolves around the mandrel 6 while rotating, an ideal plastic working by rolling (rolling) of the roller is possible.
[0016]
The operation procedure in the tube end machining tool 10 configured as described above is as follows.
[0017]
The tube 1 is clamped by the clamp jig 2 by projecting the bending length of the tube forming portion at the tube end portion of the tube 1 that performs tube forming processing. The round bar portion 3a of the shank 3 of the tube end portion processing tool 10 is attached to a spindle portion of a rotary drive machine (not shown) such as a drilling machine so as to be rotatable. When the shank 3 is rotated in this state, the frame 4 locked to the shank 3, the roller 5 interposed in the roller groove portion of the frame 4, and the mandrel 6 in contact with the outer peripheral surface of the roller 5 start to rotate. . Here, when feeding is applied to the tube end processing tool 10, the indented portion 5 c of the roller 5 abuts on the tube end 1 a of the tube 1 and turns along the end surface of the tube 1 along the shape of the indented portion 5 c. Then, the tube end 1a is gradually bent outward.
[0018]
On the other hand, although the roller 5 is pressed by the tube end 1a, it is supported by the mandrel 6 which is closely arranged to the roller 5, so that there is no influence on the blow molding process in the roller 5, and the tube end is The plastic working can be continued gradually until it comes into contact with the end of the clamp jig 2 and bends completely at a right angle.
[0019]
The mandrel 6 has a stepped flange portion 6b on the rear side following the guide taper surface 6a. The mandrel 6 is sandwiched between two needle-like thrust bearings 7a and 7b and further independent of the shank 3 by the ball bearing 8. Since the roller 5 can rotate smoothly, the roller 5 also rotates smoothly. That is, the roller 5 and the pipe 1 do not slip during the molding process, and there is no concern about damage to the processed surface and cracks at the pipe end that are likely to occur during the slip.
[0020]
【The invention's effect】
According to the tube end processing tool of the present invention, a specially shaped end surface expanding roller is employed, and further, the pressure received by the end surface expanding roller during the rib forming process can be freely rotated in the frame via a bearing. The configured mandrel is received and the roller rotates smoothly to reduce the processing load, so that the roller and the tube do not slip and damage to the processed surface and cracks at the end of the tube do not occur. It has made it possible to perform bending and bending in two processes in one process, improving processing efficiency.
[0021]
In addition, even if an expensive large processing machine is not used, it can be processed up to a certain size just by attaching it to a general-purpose machine, so that the production cost can be kept low while maintaining versatility.
[Brief description of the drawings]
FIG. 1 is an overall front view of a half section of a tube end machining tool according to an embodiment.
FIG. 2 shows an operation procedure related to a conventional blow molding process, FIG. 2 (a) shows an initial flare processing state in the first step, and FIG. 2 (b) shows a final blow molding process state in the second step. To express.
[Explanation of symbols]
3 Shank 4 Frame 5 Roller 6 Mandrel 7a, 7b Thrust bearing 8 Ball bearing

Claims (1)

A shank connected to the rotation drive unit, a frame locked to the shank, one or more pipe end widening rollers interposed in the frame, and a pipe end processing tool including a mandrel inside the frame The mandrel is rotatably held through a bearing inside the frame, and the pipe end widening roller is interposed in a roller groove formed in the frame slope taper part so as to be rotatable in a radial manner by three or more. A recessed portion having an angle of approximately 120 degrees is formed in the middle portion of the tube end expanding roller so as to expand the tube end portion at right angles to the tube axis, and the outer peripheral surfaces of both ends of the roller other than the recessed portion are A pipe end machining tool, wherein the tapered outer peripheral surface of a mandrel is disposed so as to be in a pressable manner.

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