WO2009125512A1

WO2009125512A1 - Pipe clamp device

Info

Publication number: WO2009125512A1
Application number: PCT/JP2008/070358
Authority: WO
Inventors: 庭山康; 北浦康次; 中村泰一; 檜垣只広; 西本正
Original assignee: レッキス工業株式会社
Priority date: 2008-04-10
Filing date: 2008-10-31
Publication date: 2009-10-15
Also published as: TWI451919B; EP2295161A4; JP5448360B2; EP2295161A1; TW200942343A; JP2009248176A

Abstract

As shown in Fig. 3, a projection (11) is provided on a mating surface of a lower clamp member (1b), an opening (12) for receiving the projection (11) is provided in a mating surface of an upper clamp member (1a), the projection (11) has a flat surface (13a) perpendicular to the axis of a pipe (4), and the flat surface (13a) is provided to be flush with a contact surface (13b) making contact with a stepped surface (2c) of a lower liner (3b) of the lower clamp member (1b). Pressing force in flaring of the clamped pipe causes a stepped surface (2c) of an upper liner (3a) to be in flash with and engage the stepped surface (2c) of the lower liner (3b), and this prevents occurrence of a step extending in the axial direction of the pipe and located between the upper and lower liners (3a, 3b).

Description

Textbook Tube Clamping Device Technical Field

The present invention relates to a pipe clamp device used in a flare forming processing apparatus for a pipe end, and more specifically, when connecting a pipe used as a refrigerant pipe of an air conditioner or the like, a flare-shaped part provided at the pipe end. Background art on tube clamping device required to form a flaring tool

Conventionally, in order to form a flare by expanding the end of a pipe material (mainly a copper pipe) into a conical shape, a flare forming work apparatus comprising a tube clamp apparatus and a manual or electric flare forming tool is used. Is used. As shown in Figure 1

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In addition, the flare forming process of the tube material 4 is performed by pressing and rotating the eccentric cone of the flare forming tool against the end of the tube material 4 clamped by the tube clamp device. The center of rotation of the eccentric cone 5 is inclined with respect to the axis of the main shaft, and even if the main shaft rotates, the top of the eccentric cone 5 is always on the axis of the main shaft. .

An example of a conventional tube clamping device is shown in Fig. 10. One end is a fulcrum

It has a split-type clamp 1 that can be opened and closed by 7. The clamp 1 includes an upper clamp member 1 a and a lower clamp member 1 b. A clamp bolt 軸 is pivotally supported at the other end of the upper clamp member 1 a, and a link is pivotally supported at the other end of the lower clamp member 1 b. Has been. When flaring the tube material 4, the knob 8 is rotated and the clamp bolt is screwed into a tightening nut (not shown) to tighten the tube material 4 with the upper clamp member 1a and the lower clamp member 1b. Then, after the flare forming process of the tube material 4 is finished, the knob 8 is loosened, and the upper clamp member 1 a and the lower clamp member 1 b are opened by tilting to the side as shown by the dotted line. Reference numeral 19 is a stopper for determining the axial position of the pipe, and after positioning, it can be retracted from the pipe end position.

In addition, as shown in FIGS. 10 and 11, the upper and lower clamp members 1 a and 1 b include a clamping portion 2 a that clamps the tube material 4 on the inner surface, and a conical surface 2 b for forming a flange on the end surface. The upper and lower liners 3 a and 3 b having the above are fixed to the upper and lower clamp members la and lb integrally by screws 14.

The flare forming process at the end of the pipe is done by inserting the end of pipe 4 to be flare into clamp 1 and pressing it against stopper 19 and turning knob 8 to tighten upper and lower clamp members la and lb. In the case of a power tool that is fixed, by rotating the motor, it is pushed out in the axial direction by the feed screw shaft while rotating the main shaft. As a result, the eccentric cone 5 rotates eccentrically to apply a pressing force to the end of the tube material 4, thereby forming a flare at the end of the tube material 4.

At this time, the pair of upper and lower liners 3 a and 3 b are fixed to the clamp 1 without causing any step in the axial direction and without causing any misalignment along the dividing surface 6 in the direction perpendicular to the axial center. Therefore, it is desirable that the end corners of the upper and lower liners 3a and 3b form a complete conical surface 2b during the flare forming process.

However, in the conventional tube clamping device, there is no mechanism for sufficiently fixing the clamp 1 in the tube axis direction at the time of tube clamping, and the upper and lower liners 3a and 3b are stepped in the axial direction by the pressing force at the time of flare formation. The difference T (Fig. 13 A) may occur, which is a problem. In addition, the upper and lower liners 3a and 3b are displaced from each other in the radial direction of the pipe material 4. There was also a problem.

The center misalignment is determined by the center-to-center distance R between the fulcrum 7 and the upper and lower clamp members la and lb, but there are some gaps in the shaft diameter and hole diameter of the fulcrum 7, and the upper and lower liners 3a and 3b Is less likely to occur because it is clamped along the tube 4. The level difference is a problem in terms of frequency of occurrence, and if a level difference occurs, the flare shape becomes poor as shown in Fig. 13A and Fig. 13B.

The steps of the upper and lower liners 3a and 3b are reflected in the flare shape of the pipe material 4 as described above. A certain level of step does not affect the gas leak, but even if the gas leak occurs due to other factors such as construction problems such as insufficient tightening of the joint, the cause of the flare shape is suspected. There is a need for a tube clamping device that does not cause a step between the upper and lower liners 3a and 3b from the viewpoint of investigating the cause of a true failure.

Conventionally, as shown in FIG. 11 and FIG. 12, the upper clamp member 1 a is provided with a protruding piece 9 and the lower clamp member 1 b is provided with a fitting portion 10 of the protruding piece 9 as a countermeasure against the above step. When the tube material 4 was clamped, the protruding piece 9 and the fitting portion 10 were fitted to prevent the occurrence of a step in the tube axis direction.

However, gaps (P and Q in Fig. 12) are provided between the projecting piece 9 and the fitting part 10 to prevent interference during fitting, and the upper and lower liners 3a and 3b are flared. Since the pressing force is received in the direction of arrow F in FIG. 12, the upper clamp member la is displaced in the direction of arrow F along the tube axis direction by the gap P of the fitting portion 10. Even if the dimensions of the projecting piece 9 and the fitting part 10 are set so as to reduce the above-mentioned gearup P as much as possible, a step of about 0.2 mm is generated due to the accumulation of dimensional tolerances, and the step difference cannot be completely eliminated. It was difficult. Japanese Laid-Open Patent Publication No. 2 0 0 3 — 1 2 6 9 1 7, Japanese Laid-Open Patent Publication No. 7 — 9 6 3 3 1 and Japanese Laid-Open Patent Publication No. 7 — 1 8 5 6 7 5 are related to conventional segment lamp devices. Is described. Disclosure of the invention

In view of the above-described conventional problems, the object of the present invention is to provide a tube clamp device that can always perform good flare forming processing without causing a step in the tube axis direction in the upper and lower liners by pressing force during flare forming processing. It is to provide a flare forming apparatus to be used.

According to the present invention, there is provided a pipe clamping device for processing a pipe end portion, and a pair of halved upper and lower liners each having a substantially cylindrical shape are attached to clamp the entire outer peripheral surface of the end portion of the pipe material, The upper and lower liners each have a semi-cylindrical inner surface and an end of the pipe member provided on one end surface continuously to the inner surface. A conical slope for machining the part and an outer peripheral surface having a step formed by a step forming surface perpendicular to the axis of the cylinder, and the inner surface is brought into contact with the outer peripheral surface of the end of the pipe In addition, the clamp member is clamped by the liner by tightening the clamp member in a state where the end face of the pipe member is aligned with the outer end position of the slope, and the clamp members are mutually connected during the tube clamp. Together And a protrusion is provided on the mating surface on the lower clamp member side, and a recess is provided on the mating surface on the upper clamp member side to accommodate the protrusion. A vertical plane, and the plane is provided on the same plane as the contact surface with the step forming surface of the lower liner of the lower clamp member. A tube clamp device is provided in which the step forming surface and the step forming surface of the lower liner are in contact with the same plane. - Further, according to the present invention, in addition to the protrusion and the opening, a pin is attached to one surface of the contact surface between the upper and lower liners at the time of pipe clamping instead of the protrusion or the opening. However, there is provided a tube clamping device in which a pin hole is provided concentrically on the other surface, and the pin and the pin hole have a chamfered portion for avoiding mutual interference.

In addition, according to the present invention, there is provided a tube clamping device in which the pin hole is provided by decentering a hole larger than the diameter of the pin with respect to the pin hole. Brief Description of Drawings

FIG. 1 is an assembly cross-sectional view showing a first embodiment of a tube clamping device and a flare forming apparatus according to the present invention.

FIG. 2 is an assembly schematic diagram showing the first embodiment of the tube clamping device of the present invention.

3 is a cross-sectional view taken along line AA in FIG.

4 is a cross-sectional view taken along the line B--B in FIG.

FIG. 5 is a perspective view of the pair of clamp members of the present embodiment as viewed from the opposite side of the flared surface.

FIG. 6 is a perspective view C of the pair of clamp members of the present embodiment as viewed from the flared surface side.

FIG. 7A is a view for explaining a second embodiment of the tube clamping device of the present invention, and is a cross-sectional view of a dividing surface of the lower liner.

FIG. 7B is a view for explaining a second embodiment of the tube clamping device of the present invention, and is an assembly cross-sectional view of a pair of upper and lower liners at CC in FIG. 7A.

Fig. 8 is a partially enlarged view of Fig. 7 IV.

FIG. 9 is a cross-sectional view of the dividing surface of the lower liner showing another embodiment of the present invention. FIG.

FIG. 10 is an assembly schematic diagram showing an example of a conventional tube clamping device. FIG. 11 is a sectional view taken along the line DD of FIG.

FIG. 12 is a cross-sectional view taken along the line EE in FIG.

Fig. 13 A is a diagram schematically showing the state of the pipe and liner when a flare processing failure due to a step occurs.

Fig. 13B is a diagram schematically showing the state of the pipe when a flaring failure occurs due to a step. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, a first embodiment of the tube clamping device of the present invention will be described with reference to the drawings.

The tube clamp device of the present embodiment shown in FIGS. 1 to 4 and the conventional tube clamp device described in FIGS. 10 to 12 have substantially the same configuration with respect to the clamp mechanism for flare formation processing. Therefore, the differences between the two configurations will be described below. Common parts are denoted by the same reference numerals. In addition, the expression “upper and lower” indicating clamp members, liners, etc. is intended to clarify the positional relationship between the components, and does not represent the actual spatial position on the layout. It is not a limitation.

A point consisting of a pair of clamp members 1a and 1b to which a pair of halved upper and lower liners 3a and 3b are attached, which clamp the entire outer peripheral surface of the end of the tube 4 However, the pipe clamping device of the present embodiment has a pair of clamping members 1 a and 1 b and a mating surface 6 a on the lower clamping member 1 b side. Projection 1 1 is provided on b, upper clamp member 1 a side mating surface 6 a This is different from the prior art tube clamp device in that a recess 12 is provided for receiving the projection 11 at the time of tube clamping.

That is, in the above-described configuration of the present embodiment, the flat surface 1 3 a perpendicular to the tube axis of the projection 11 provided by extending a part of the lower clamp member lb is formed on the lower liner 3 b of the lower clamp member 1 b. It is provided along the same surface as the contact surface 1 3 b with the step forming surface 2 c. FIGS. 5 and 6 show the positional relationship between the protrusion 11, the recess 12, the plane 13 a and the liner contact surface 13 b.

With the above configuration, when the flare forming process is performed on the pipe end, the pipe material 4 is clamped by the upper and lower liners 3a and 3b, and the eccentric cone 5 itself rotates around the eccentric axis, and further the eccentricity When the shaft rotates around the central axis and is pressed in the direction of the central axis, the conical slope of the eccentric cone 5 rotates along the circumferential surface of the end of the tube 4 and axially applied to the end of the tube. Apply pressing force. Due to this pressing force, the step forming surface 2 c of the upper liner 3 a and the step forming surface 2 c of the lower liner 3 b abut against the flat surface 1 3 a and the contact surface 1 3 b located on the same plane. There is no step in the tube axis direction on the liners 3a and 3b.

As described above, in the first embodiment, the protrusion 1 1 is formed on a part of the mating surface 6 b of the lower clamp member lb, and the flat surface 1 3 a of the protrusion 1 1 is set as the step forming surface of the upper liner 3 a. 2 Contact surface with c. The above-mentioned plane 1 3 a is arranged on the same surface as the contact surface 1 3 b with the lower liner 3 b of the lower clamp member lb. As a result, the upper and lower liners 3 a and 3 b are used during flare processing. Are in contact with the same planes 1 3 a and 1 3 b as the liner abutting surface of the lower clamp member 1 b, thereby preventing the occurrence of a step.

Next, a second embodiment will be described.

In this embodiment, the upper and lower liners 3a and 3b are The lower liners 3a and 3b are provided with pins 15 and 16 holes, respectively. As shown in FIGS. 7A and 7B, two pairs of pins 15 and pin holes 16 are provided, one on each of the lower surface of the upper liner 3a and the upper surface of the lower liner 3b.

As for the diameters of the pins 15 and 16, the gap can be set to 0.1 mm or less, so that the step size can be suppressed to 0.1 mm or less, and the occurrence of steps can be substantially prevented. Also, as shown in Fig. 8, chamfered portions 17 are provided on the outer peripheral portion of the end surface of pin 15 and the edge of pin hole 16, and the outer peripheral portion of the end surface of pin 15 is pin hole at the time of tube clamping. It does not interfere with the edge of 1 6 and is easy to fit. In this embodiment, two pairs of pins 15 and a pin hole 16 are provided in place of the protrusion 1 1 and the opening 12, but the pin 15 and the opening 1 2 together with the pin 15 and the opening 1 2 are provided. Pin holes 16 may be provided.

In this embodiment, as an example, the pin 15 and the corresponding pin hole 16 are arranged so as to be concentric when the tube is clamped. As another example, as shown in FIG. The diameter of the pin may be made larger than the pin diameter, and the pin 15 may be arranged so as to be eccentrically inserted into the hole 18 by the dimension S at the time of pipe clamping. As a result, the accuracy restriction of the chamfered portion 17 for fitting the pin 15 is relaxed.

In the embodiment in which the hole 18 is provided in such an eccentric manner, the inner wall of one hole 18 in the tube axis direction is arranged so as to be substantially in contact with the outer periphery of the pin 15, and the upper and lower liners 3 a and 3 b It prevents the occurrence of axial steps.

In Figure 9, only one of the two pin connections is decentered, but this does not matter if both pin connections are decentered.

As described above, the pipe clamping device of the present invention and the flare forming processing apparatus using the same can prevent the occurrence of a step difference between the upper and lower liners during the flare forming processing and can improve the reliability of the flare forming processing of the pipe material.

Claims

The scope of the claims

1. Pipe clamping device for pipe end machining,

A pair of halved upper and lower liners, each of which is clamped on the entire outer peripheral surface of the pipe material, are attached to each other, and are provided with a pair of clamp members that are closably connected at one end side fulcrum. And

Each of the upper and lower liners has a semi-cylindrical inner surface, a conical slope for processing the end of the pipe material provided on one end surface continuously to the inner surface, and a step forming surface perpendicular to the axis of the cylinder. And an outer peripheral surface on which a step is formed,

The inner surface is brought into contact with the outer peripheral surface of the end portion of the tube material, and the clamp member is clamped in a state where the end surface of the tube material is aligned with the outer end position of the inclined surface, whereby the tube material is clamped by the liner. In

When clamping the tube, the clamping members face each other at the mating surface, and a projection is provided on the mating surface on the lower clamp member side, and a recess for accommodating the projection is formed on the mating surface on the upper clamp member side. Provided,

The protrusion has a plane perpendicular to the axis of the pipe material, and the plane is provided on the same plane as a contact surface of the lower clamp member with the step forming surface of the lower liner, When the tube is clamped, the step forming surface of the upper liner and the step forming surface of the lower liner are in contact with the same flat surface.

A tube clamping device characterized by that.

2. In addition to or instead of the protrusion and the opening, a pin is provided on one surface of the contact surface between the upper and lower liners at the time of the tube clamping, and a pin hole is provided on the other surface. Is provided concentrically and above The tube clamping device according to claim 1, wherein the pin and the pin hole have a chamfered portion for avoiding mutual interference.

3. The tube clamping device according to claim 2, wherein the pin hole is provided by decentering a hole larger than the diameter of the pin with respect to the pin hole.