JPS6313775B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION For example, as shown in FIG. 2
A stopper flange 2a that can be brought into contact with the inner step 1a of the connection plug 1 is formed on the end by expansion molding, or the end of the water pipe is modified to be a perfect circle for connection, etc. The present invention relates to a pipe end forming device that performs processing such as changing the diameter.

To be more specific, the forming of the pipe end generally includes (a) flaring, (b) flange forming (c) rounding, and (d) pipe expansion. Conventionally, the above-mentioned processing apparatuses have been specially equipped with forming tools as shown below.

That is, the processing in (a) uses a conical member whose top is located on the rotation axis.

Processing in (b): After processing in (a) above, use one equipped with an inverted T-shaped member.

Processing in (c): A member having a tapered surface at the tip and a cylindrical or cylindrical member having an outer diameter approximately equal to the inner circumferential diameter of the pipe to be processed is used.

Processing (d): A cylindrical or cylindrical member having a tapered surface on the tip side and having a predetermined diameter larger than the inner circumference of the pipe to be processed is used.

However, when performing the flanging described in (B) above, it is necessary to replace the one with the conical member with one with an inverted T-shaped member when transitioning from the processing in (B). The problem was that it took a lot of effort to replace them, and the efficiency of the molding work was low. Also, as mentioned above (c)
and (d) For each processing, depending on the diameter of the pipe to be processed or the diameter to be expanded, even though the members are cylindrical or cylindrical in the same shape,
In order to accommodate each type of equipment, a large number of specialized devices with different diameters must be prepared and replaced, which is extremely uneconomical due to high initial cost, and requires a great deal of effort to replace. However, this method had the disadvantage of reducing the efficiency of molding operations.

In view of the above points, it is an object of the present invention to make it possible to carry out various molding operations on tube ends at low initial cost and with high efficiency.

In order to achieve the above-mentioned object, the tube end forming apparatus of the present invention has a fixing member fixedly positioned relative to the tube to be processed. a rotating member movable in a direction along the rotational axis, the rotating member being provided with first and second molding surfaces at different positions in the direction along the rotational axis, the first molding surface; a first position in which it is displaced along the entire circumference of its end while contacting the inner circumferential surface of the pipe to be processed, and a first position in which it is displaced in a direction intersecting the rotational axis from that position and entered into the pipe to be processed. The second molding surface is configured to be freely changeable and fixed to a second position where the second molding surface is applied.

The effects of the above feature configuration are as follows.

In other words, when flaring as described in (a) above, the conical first forming surface is fixed at the first position and moved in the direction of the rotation axis, and the first forming surface is moved to the end of the pipe to be processed. It acts over the entire circumference of the tube, pushing the end of the tube into a tangle-like shape. When performing the flange processing described in (b) above, the first
The molding surface is displaced and fixed at the second position, and while moving in the direction of the rotational axis in this state, the second molding surface perpendicular to the rotational axis is applied to the end of the tube that has been pushed and expanded in a floppy shape. This forms a flange portion perpendicular to the rotational axis. In the above-mentioned (c) perfect circle processing, a surface having a conical tip and a cylindrical shape as a whole is provided as the first forming surface, and the first forming surface is rotated with the first forming surface fixed at the first position. While moving in the axial direction, the first shaping surface is applied to the inner circumferential surface of the tube over the entire circumference of the end, thereby making the end of the tube a perfect circle. Then, during the tube expansion process described in (d) above, the first position to be fixed is appropriately changed using the same first molding surface as in the case (c) described above, and the end of the tube is expanded by the same action. That's what I do.

The effects of the above action are as follows.

That is, by simply displacing the first molding surface in the direction intersecting the rotational axis, and changing the fixed position from the first position to the second position, the flange can be replaced without any replacement operation. In addition, when switching from round processing to tube expansion processing, the first molding surface is applied to the tube end.
By changing the fixed position to multiple positions at the position itself, it is possible to perform both perfect circular and tube expansion processing using the same first forming surface without replacing with different parts, and the workpiece can be Even if the diameter of the pipe differs, it can be easily accommodated, and by moving the first molding surface along the entire circumference of the end of the pipe at the first position offset from the rotation axis of the rotating member, the pipe end can be easily adjusted. You can perform various molding processes on parts by simply replacing some molding tools while using most of the equipment.
The initial cost is low and it can be done efficiently.

Hereinafter, embodiments of the present invention will be described in detail based on illustrative drawings.

[First Embodiment] A screw shaft 6 is threadably screwed into a fixing member 5 to which a fixing grip 4 is connected, and a lower end of the screw shaft 6 has a
A support member 7 is attached to the screw shaft 6 so as to be rotatable around the axis P which is offset from the rotation axis _X of the screw shaft 6. A second molded member 9 having a second molded surface F ₂ perpendicular to the rotation axis A gripping mechanism 11 for gripping the processed tube 2 is attached to constitute a tube end forming apparatus.

A handle 13 is attached to the upper end of the screw shaft 6 via a ratchet mechanism 12, and the screw shaft 6 can be rotated by holding the fixing grip 4 with one hand and swinging the handle 13 back and forth with the other hand. It is configured to be spiraled downward. Although not shown, the ratchet mechanism 12 includes a handle 13.
A mechanism for switching the transmission direction of the operating force is provided, and by switching the mechanism, the screw shaft 6 can be screwed upward as the handle 13 is reciprocated and swung.

A rotation support shaft 14 is provided protruding above the support member 7, and is fitted into a hole 15 drilled in the lower part of the screw shaft 6 so as to be rotatable around the rotation axis P. A positioning pin 16 is provided protruding downward, and a large number of engagement holes 17a, 17b are provided on the support member 7 side at predetermined positions on the circumference centered on the rotation axis P of the support member 7. ...17h is drilled. In the figure, reference numeral 18 denotes a bolt that locks into an annular groove 19 formed in the rotation support shaft 14 to prevent the support member 7 from coming off.

With the above configuration, flaring will first be explained. As shown in FIGS. 3 and 4, with the positioning pin 16 inserted into the predetermined engagement hole 17a and fixed in position, the first molding surface F ₁ is positioned corresponding to a predetermined location on the outer periphery of the end of the pipe to be processed 2 fixed by the gripping mechanism 11, and in this state, by screwing the screw shaft 6 downward, the first forming surface _F1 is aligned with the pipe to be processed. While contacting the entire circumference of the end of the pipe 2, it moves downward in the rotational axis X direction of the screw shaft 6, and
The ends of the paper are pushed out in a rasp-like shape.

Next, to explain the flange processing for forming the flange part, after the above-mentioned flaring processing, the fifth
As shown in FIG. 6 and FIG. 6, the retainer is released and the support member 7 is pulled out downward, rotated around the rotation axis P of the rotation support shaft 14, and the positioning pin 16 is inserted into another predetermined engagement hole 17e. ... and fixed in position by a retainer against the support member 7, so that the first molded member 8 is located within the inner circumferential surface of the pipe to be processed 2,
In this state, by screwing the screw shaft 6 downward, the pipe 2 to be processed is expanded into the shape of a bulge.
The second forming surface F ₂ is applied to the end of the pipe 2 to be processed.
The flange 2a is formed by expanding the end portions of the flange 2a so as to be perpendicular to or close to the rotational axis X.

In forming using either of the first and second forming surfaces F ₁ and F ₂ described above, the first and second forming members 8 and 9 rotate with respect to the support member 7 by the ball bearing 10, and the pipe to be processed 2 is rotated by the ball bearing 10. This prevents the surface from being damaged by sliding contact with the edge of the material.

Next, to explain perfect circular processing, as _shown in FIG _. A cylindrical or cylindrical molding member 20 having a first molding surface F ₁ is attached, and the cylindrical surface f ₂ of the molding member 20 corresponds to the original inner diameter of the pipe 2 to be processed. The support member 7 is positioned at
rotate the positioning pin 16 into the predetermined engagement hole 17.
d, 17f... and fixed in position, and by rotating the screw shaft 6, the molded member 20 is moved in the rotation axis X direction while contacting the outer periphery of the end of the pipe to be processed 2, and the predetermined trueness is achieved. Correct it to a circle.

To explain the tube expansion process, as shown by the two-dot chain line _L1 in FIG. 7, _the supporting member is 7, the positioning pins 16 are inserted into predetermined engagement holes 17b, 17h, and fixed in position, and the screw shaft 6 is rotated to bring the molding member 20 into contact with the outer periphery of the end of the pipe to be processed 2. while moving the rotation axis in the X direction,
The diameter of a portion of the end of the tube to be processed 2 over a predetermined length in the tube axis direction is expanded. This tube expansion process, for example,
This is done when one of the tubes 2 to be processed is expanded in diameter by an amount equivalent to its wall thickness in order to fit and connect two tubes 2 to be processed having the same diameter.
Further, the second forming member 9 can also perform double flare processing in which the end of the pipe to be processed 2 is folded back while forming a dogleg-shaped cross section over its entire circumference.

To configure the gripping mechanism 11, as shown in FIG. 8, a gripping member 21 is pivotally connected to the fixed member 5 so as to be swingable around the vertical axis _Q1 , and the free end of the gripping member 21 is An engagement groove 22 is bored on the side,
On the other hand, a bolt 23 that can be freely engaged and detached from the engagement groove 22 is pivotally connected to the fixing member 5 so as to be swingable around the vertical axis _Q2 , and a wing nut 24 is screwed onto the bolt 23. The pipe to be processed 2 is sandwiched between the fixing member 5 and the gripping member 21, and the pipe to be processed 2 is held under pressure by locking the bolt 23 in the engagement groove 22 and tightening with the wing nut 24.

[Second Embodiment] As shown in FIGS. 9 and 10, the support member 7
A large number of engagement recesses 25a, 25b, . A rod member 27 that is selectively engaged with and disengaged from the engagement recesses 25a, and a compression coil spring 28 that presses and biases the rod member 27 to displace it toward the engagement side are provided on the side. Although the member 7 can be rotated integrally with the screw shaft 6, when changing the forming process described above, the support member 7 is rotated manually without receiving any reaction force from the pipe to be processed 2, and the first implementation is performed. The structure is such that the fixing position can be easily changed without having to move the support member 7 away from or near the screw shaft 6 as in the case of the example.

[Third Embodiment] As shown in FIGS. 11 and 12, the screw shaft 6
A dovetail groove 29 is formed in the lower part of the
A T-shaped member 30 connected to the support member 7 is fitted into the dovetail groove 29 so as to be slidable in a direction perpendicular to the rotational axis X of the screw shaft 6, and A wavy locking portion 31 is formed on the upper portion of one end, and a retaining plate 32 that selectively locks onto the wavy locking portion 31 to fix the support member 7 in a predetermined position is attached to the screw shaft 6. The fixing position of the first molding surface F ₁ is changed to a direction perpendicular to the rotational axis X of the screw shaft 6, and the first molding member 8
The structure is such that various molding processes can be performed by attaching the above-mentioned molding member 20 instead.

In the first to third embodiments described above, the screw shaft 6, the support member 7, the first and second molded members 8 and 9 are used, or the molded member 20 is used instead of the first molded member 8 in the above configuration. Each of the components used is called a rotating member.

Furthermore, whether the first molding member 8 or the molding member 20 is deviated from the rotational axis X of the screw shaft 6, the molding member 8 or 20 is aligned along the outer periphery of the end of the pipe to be processed 2. The positions where the first molded member 8 is displaced while in contact are collectively referred to as a first position, and the position where the first molded member 8 can be inserted into the pipe to be processed 2 without contact is referred to as a second position.

In addition, in the present invention, for example, as shown in FIG. 13, the screw shaft 6 is attached to the fixing member 5 so as to be rotatable around the horizontal axis, and the screw shaft 6 is rotated by an electric motor 33 or the like. It may also be driven in reverse. In this case, the copper tube 2 is transported to a position corresponding to the screw shaft 6 using various types of transportation tools. In this way, it is possible to process objects with large diameters such as 20 cm, 1 m, or more.

In the present invention, in order to screw the screw shaft 6,
A motor may be coupled to the screw shaft 6 in place of or in combination with the handle 13, and the screw shaft 6 may be driven to thread.

Further, in the above embodiment, the gripping mechanism 11 is provided integrally with the fixing member 5, but in the present invention,
For example, a holding mechanism may be provided on a fixing base separate from the fixing member 5, and the fixing member 5 may be detachably attached and fixed to the fixing base.

[Brief explanation of the drawing]

The drawings show an embodiment of the tube end forming apparatus according to the present invention, FIG. 1 is a partially cutaway side view showing a pipe to be processed, FIG. 2 is a partially omitted overall side view of the first embodiment, Fig. 3 is an enlarged sectional view of the main part of Fig. 2, Fig. 4 is a partially omitted view taken along the - line in Fig. 3, Fig. 5 is a side view illustrating the forming process switching state, and Fig. 6 is , a side view of the flange processing state, FIG. 7 is a side view of the molded member attached for perfect round processing, FIG. 8 is a cross-sectional view taken along the line - - of FIG. 2, and FIG. 9 is the second embodiment. 10 is a partially omitted view along the line - in FIG. 9, FIG. 11 is a sectional view of the main part of the third embodiment, and FIG. 12 is a cross-sectional view taken from XII-XII in FIG. 11. Linear view, 1st
FIG. 3 is a schematic side view showing the drive type. 2...Pipe to be processed, 5...Fixing member, X...Rotation axis, _F1 ...First molding surface, _F2 ...Second molding surface.

Claims (1)

[Claims] 1. A rotary member is attached to a fixed member 5 that is fixedly positioned with respect to the pipe to be processed 2, so that it can rotate around an axis X corresponding to the center of the pipe to be processed 2 and move freely in a direction along the rotation axis X. and the rotating member is provided with first and second molding surfaces F ₁ and F ₂ at different positions in the direction along the rotation axis X, and the first molding surface
A first position in which F ₁ is displaced along the entire circumference of the end portion while contacting the inner circumferential surface of the pipe to be processed 2, and a first position in which F 1 is displaced in a direction intersecting the rotation axis X from that position and the A pipe end forming apparatus characterized in that the apparatus is configured to be able to be freely changed in position and fixed to a second position where the second forming surface _F2 is applied by entering into the processed pipe 2.