JPH09257404A - Gauge for measuring degree of diametrical expansion of pipe end - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable checking for the roundness of a parallel part of a deformed pipe during the expanding processing of a pipe while accurately measuring the degree of expansion of the pipe by arranging a parallel cylinder part inserted into a tip part with the inner diameter of the pipe confined to the prescribed minimum dimensions and successively, a tapered outer circumferential surface contacting the internal surface of the expanded part. SOLUTION: In a parallel cylinder part 11, an outer circumferential surface thereof is finished to an outer diameter dimensions the same or slightly smaller than the prescribed minimum dimensions of the inner diameter of a parallel part 21 of a pipe 20. Therefore, unless the parallel part 21 of the pipe 20 is deformed flat, the parallel cylinder part 11 can be easily inserted into the parallel part 21 of the pipe from the side of an expanded end part 22 of the pipe. A tapered outer circumferential surface 12 which is made to contact the internal surface of the expanded end part 22 of the pipe 20 to measure the degree of the diametrical expansion of the expanded part is finished to a taper angle equal to the angle of expansion of the pipe expanded part 22. The width dimension H1 of the tapered outer circumferential surface 12 is equivalent to the maximum or minimum of the dimension of the expanded end part 22 of the pipe. Thus, the expanded end part 22 of the pipe can be determined to be normal in the degree of expansion when it is on the tapered outer circumferential surface 12 within the width H1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, when connecting to a so-called flare joint, is provided with a flared expansion portion at the end of the pipe for connection. The present invention relates to a gauge for measuring the amount of expanded diameter for determining the quality of.

[0002]

2. Description of the Related Art Normally, in a flare joint for connecting a copper pipe or a stainless pipe, a flare-like widened portion is processed at the end of the pipe, and the flared joint is sandwiched between the joint body and a cap nut for connection. If the flared widened portion provided at the end of the pipe is too large, the amount of deformation of the pipe becomes excessive, the strength of the flare portion decreases, and the connection with the flare joint is not normally performed. Further, if the flared widened portion is smaller than the specified size, the amount of the flared joint body and the cap nut to be sandwiched is reduced, and the sealing property and the pull-out preventing force of the pipe are reduced. For this reason, it is desirable to measure the amount of expansion when connecting the flared expansion to the end of the pipe before determining whether the connection is good or bad.The conventional measuring method is calipers. The maximum diameter of the expanded portion was measured, or the expansion amount of the pipe end expanded portion was measured using the taper gauge shown in FIG.

[0003]

However, in the former method of measuring the amount of expansion with calipers, it is difficult to measure the caliper's beak against the maximum diameter portion of the flare end of the pipe, and measurement error occurs. It is easy to occur. It is also a very troublesome task. Although the latter method using the taper gauge shown in FIG. 3 seems to be very simple and accurate at first glance, the taper outer peripheral surface of the gauge is made to correspond to the inner surface of the expanded portion of the pipe by aligning the axis of the tube with that of the gauge. It is difficult to hit, and there is a problem that it can not be accurately measured if the touch is distorted even a little. INDUSTRIAL APPLICABILITY The present invention solves the above-mentioned problems and can accurately measure the expansion amount of a pipe, and at the same time, can easily check the roundness of the parallel part of the deformed pipe when expanding the pipe. Is provided.

[0004]

SUMMARY OF THE INVENTION The gist of the present invention is a gauge for measuring the diameter expansion amount of a flared portion having a flared flared portion at the end of the pipe, the tip of which is defined by the inner diameter of the pipe. A pipe end diameter expansion amount measuring gauge, comprising: a parallel cylindrical portion that is inserted into a minimum dimension; and a tapered outer peripheral surface that is in contact with the inner surface of the expanded portion, following the parallel cylindrical portion. In the above, the width dimension of the taper outer peripheral surface may be the width dimension of the taper outer peripheral surface corresponding to the maximum value and the minimum value of the diameter expansion amount defining dimension of the pipe expanding portion. In the above, the tapered outer peripheral surface may be provided with a visual determination portion corresponding to the diameter expansion amount defining dimension of the pipe expansion portion. Further, in the above description, a grip portion may be provided on the rear end side of the tapered outer peripheral surface to make the inside of the whole hollow.

[0005]

Since the present invention is constructed as described above, the parallel cylindrical portion at the tip of the gauge is inserted into the inner surface of the parallel portion of the pipe from the expanded end portion side of the tube, and the tapered outer peripheral surface of the gauge is applied to the inner surface of the expanded portion. It is possible to measure the pipe end widened portion on the tapered outer peripheral surface. By inserting the parallel cylindrical part on the tip side of the gauge into the inner surface of the parallel part of the tube, the axis of the tube and the axis of the gauge automatically match,
It is possible to measure by applying the taper outer peripheral surface of the gauge measuring portion to the expanded pipe portion in a state where the axes match each other, instead of measuring the pipe and the gauge in a free state as in the conventional case. Therefore, it is possible to accurately and easily measure the diameter expansion amount of the pipe expansion portion. In addition, the parallel cylindrical part on the tip side of the gauge is provided so that it can be inserted to the specified minimum dimension of the inner diameter of the parallel part of the pipe, so when processing the expanded part of the pipe, the parallel part of the pipe on the base side of the expanded part is deformed. If it is flat, the parallel cylindrical portion on the gauge tip side cannot be inserted, and therefore the flatness of the pipe parallel portion can be confirmed at the same time.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a view showing a usage state using a pipe end diameter expansion amount measuring gauge 10 according to an embodiment of the present invention.
In the drawing, 11 is a parallel cylindrical portion, and the outer peripheral surface is finished to have an outer diameter dimension that is the same as or slightly smaller than the specified minimum dimension of the inner diameter of the parallel portion 21 of the tube 20. Therefore, if the parallel portion 21 of the pipe 20 is not flat, the parallel cylindrical portion 11 can be easily inserted into the parallel portion 21 of the pipe from the side of the expanded end 22 of the pipe.

Reference numeral 12 denotes a tapered outer peripheral surface for contacting the inner surface of the expanded end portion 22 of the pipe 20 to measure the diameter expansion amount of the expanded portion.
The taper angle is finished to be the same as the expansion angle of the pipe expansion portion 22, and the width dimension H1 of the taper outer peripheral surface 12 is the width dimension corresponding to the maximum value and the minimum value of the expansion end portion dimension of the pipe. . Therefore, as shown in the figure, if the expanded end 22 of the tube is located within the width H1 of the tapered outer peripheral surface 12, it is understood that the expansion is normal. Reference numeral 13 is a grip portion having an iris-shaped knurl formed on the outer peripheral surface, and the grip portion 13 is held by a hand for measurement. In addition, the entire gauge is hollow to reduce weight so that it can be easily measured and handled.

FIG. 2 shows a pipe end diameter expansion amount measuring gauge 30 according to another embodiment of the present invention. In this embodiment, the width H2 of the tapered outer peripheral surface 31 of the measuring portion is the width H1 of the above embodiment. A groove 32 for visual judgment corresponding to the specified minimum dimension of the tube end widening portion 22 is provided on the tapered outer peripheral surface 31 so as to be longer on the smaller diameter side. In this embodiment, since the taper outer peripheral surface 31 of the gauge is long on the small diameter side, the pipe end widening portion 22 always rides on the taper outer peripheral surface 31, and the pipe end widening portion 22 that does not reach the specified expansion amount.
However, it is possible to know how small it is with respect to the specified value by the groove 32 for visual judgment.

[0009]

As described above, in the pipe end diameter expansion amount measuring gauge of the present invention, the taper outer peripheral surface of the gauge measuring portion should be applied to the inner surface of the expanded portion of the pipe in conformity with the axis of the pipe to be measured. Therefore, it is an easy-to-measure gauge that can accurately measure the expansion amount of the pipe expansion part and also check the roundness of the pipe parallel part on the base side of the expansion part.

[Brief description of drawings]

FIG. 1 is a diagram illustrating a usage state showing an embodiment of the present invention.

FIG. 2 is a pipe end diameter expansion amount measuring gauge showing another embodiment of the present invention.

FIG. 3 is a diagram showing a conventional gauge.

[Explanation of symbols]

10, 30 Pipe end diameter expansion amount measuring gauge 11 Parallel cylindrical portion 12, 31 Tapered outer peripheral surface 13 Grip portion H1, H2 Width dimension of tapered outer peripheral surface 20 Pipe 21 Parallel portion of pipe 20 22 Expanded portion of pipe 20 32 Taper Groove for visual judgment of outer peripheral surface

Claims (4)

[Claims] 1. A gauge for measuring the amount of expansion of a flared portion having a flared flared portion at the end of the pipe, wherein a parallel cylindrical portion is inserted at a tip end thereof into a prescribed minimum dimension of the inner diameter of the pipe. A pipe end diameter expansion amount measuring gauge, characterized in that a taper outer peripheral surface that abuts the inner surface of the expanded portion is provided following the parallel cylindrical portion. 2. The width dimension of the taper outer peripheral surface is set to the width dimension of the taper outer peripheral surface corresponding to the maximum value and the minimum value of the diameter expansion amount defining dimension of the pipe expanding portion. A gauge for measuring the pipe end diameter expansion. 3. A gauge for measuring a pipe end diameter expansion amount according to claim 1, wherein a visual determination portion corresponding to a diameter expansion amount prescribed dimension of the pipe expansion portion is provided on the outer peripheral surface of the taper. 4. The grip is provided on the rear end side of the tapered outer peripheral surface, and the inside of the whole is made hollow.
(3) A gauge for measuring the pipe diameter expansion amount described in (3).