JP4772736B2 - Pipe tip processing tool - Google Patents

Description

  The present invention relates to a pipe tip processing tool.

In pipe construction, when pipes are inserted into joints, chamfering work is performed on the inner peripheral corners of the pipes so that the insertion work becomes easy. In addition, pipe joints that require sealing performance are equipped with a seal member such as an O-ring at the contact portion with the pipe, so that the inner peripheral corner of the pipe is chamfered to prevent damage to the seal member. It was necessary to.
Therefore, a conventional tool for processing the tip of a pipe into a chamfered shape includes a blade portion, and the blade portion is inserted into the pipe, brought into contact with an inner peripheral corner portion of the pipe, and rotated while being pushed in, thereby rotating the pipe. The inner edge was chamfered by cutting. (For example, refer to Patent Document 1).
Japanese Patent Laid-Open No. 2003-135870

  However, with the conventional processing tool, even if the chamfering work is performed reliably, it is difficult to insert the pipe or damage the seal member due to dimensional error of the pipe itself and variation in roundness. It was not possible to cope with the problem. In addition, it is necessary to perform work so that chips are generated during the chamfering work and do not enter the pipe. Furthermore, it was necessary to remove chips and clean up after the work.

  In particular, the pipe wall is composed of three layers, the inner layer is made of resin, the intermediate layer is made of metal, and the outer diameter side is made of resin. In the case of a pipe (or metal reinforced resin pipe), the pipe end face (cut surface) of the pipe is deformed during the cutting operation, and even when the chamfering operation is performed, it is often difficult to insert into the joint. Furthermore, if it is forcibly inserted, the seal member is damaged, causing leakage. Therefore, it is necessary to correct the tip of the deformed pipe before insertion.

  Therefore, the present invention mainly makes the inner peripheral corner of the metal / plastic composite pipe (metal reinforced resin pipe) chamfered reliably, does not produce chips, and performs processing suitable for insertion into a joint or the like. An object of the present invention is to provide a pipe tip processing tool.

Therefore, the pipe tip processing tool according to the present invention has a tip diameter-reduced taper portion, and is inserted into a pipe to be processed to expand the inner diameter of the pipe by plastic deformation and correct it into a perfect circle. An insertion shaft portion for deformation and an outer flange portion formed at the proximal end of the insertion shaft portion, and the base end of the insertion shaft portion and the corner of the distal end surface of the outer flange portion, There are two crushing projections for chamfering the innermost corner of the pipe by rotating the insertion shaft in the circumferential direction, and on the tip surface of the outer collar , in sliding contact with the outer peripheral surface of the leading edge of the pipe, for suppressing the above cutting-edge escape the diameter direction by the protruding portions, arcuate periphery along the circumferential direction of the insertion shaft portion and two disposed surfaces suppression pieces protrude, the outer peripheral surface suppression piece, arranged in facing shape by sandwiching the insertion shaft portion, the axial direction of the insertion shaft portion Look al, the outer peripheral surface suppression pieces arranged by shifting the positions in the circumferential direction of the insertion shaft portion relative to the projections, furthermore, to the insertion shaft portion, a plurality of relief portions formed with plane 3 to 4 of the corresponding insertion shafts are arranged in radial branches on the pipes having different inner diameters , and each of the insertion shafts is provided with the outer flange portion. The protrusion and the outer circumferential surface suppression piece are disposed .

  According to the pipe tip processing tool of the present invention, since it has the insertion shaft portion for expanding and deforming which is inserted into the pipe to be processed and expands the inner diameter of the pipe by plastic deformation, the inner diameter of the pipe is corrected to a perfect circle. Can be of a predetermined dimension. Moreover, since the crushing protrusion for crushing the chamfered inner peripheral corner portion of the pipe into a chamfered shape is provided, the chamfered inner peripheral corner portion of the pipe can be surely formed. Furthermore, since crushing, chips are not generated as compared with cutting. In addition, since the outer peripheral surface suppression piece that slides into contact with the outermost peripheral surface of the pipe and suppresses the distal end from escaping in the diameter-expanding direction by the protrusion, the outer diameter of the distal end of the pipe is increased. Can be prevented. In addition, since a plurality of outer peripheral surface suppression pieces are arranged, it is possible to more reliably prevent the leading edge from escaping in the diameter expansion direction. Further, since the three to four insertion shaft portions are arranged in a radial branch shape, various pipes can be handled. Moreover, it is easy to give rotational torque by using a shaft portion that is not used as a handle.

Hereinafter, the present invention will be described in detail with reference to the drawings showing embodiments and reference examples.
FIG. 1 is a perspective view of a first reference example of a pipe tip processing tool and a pipe to be processed, which are closely related to the present invention. FIG. 2 is an enlarged explanatory view of the main part. FIG. 3 is a sectional view showing a use state, (a) is a partial plan sectional view, and (b) is an AA side sectional view.
Reference numeral 10 denotes a pipe to be processed which is a main object of use of the pipe tip processing tool according to the present invention. The work pipe 10 is a metal / plastic composite pipe (or a metal reinforced resin pipe) used for water supply / hot water supply pipes, and has a three-layer wall portion. A first layer 13 of resin is provided on the inner diameter side, a third layer 15 of resin is provided on the outer diameter side, and a thin metal second layer 14 is provided between the first layer 13 and the third layer 15.

Reference numeral 2 denotes a shaft portion having an outer diameter dimension (D) for expanding the pipe 10 to be processed to an ideal inner diameter dimension that can be easily inserted into a joint or the like. The shaft portion 2 has a predetermined length from the base end. A straight portion 6 having a D dimension is formed in the pipe insertion direction (tip direction) along the length (H dimension). Furthermore, it has the taper part 1 diameter-reduced toward a pipe insertion direction (tip) part. Further, two relief portions 8 having a flat surface formed on the shaft portion 2 are provided at 180 ° opposite positions. In addition, the outer diameter D of the shaft portion 2 is deformed (flattened) for reasons such as cutting and production accuracy, because the end face 16 of the pipe 10 to be processed is deformed (flat). It is set slightly larger than the inner diameter dimension d. In FIG. 2, Dt indicates the (average) outer diameter of the deformed pipe 10 before being processed by the pipe tip processing tool according to the present invention.
An outer flange portion 5 larger than the outer diameter of the workpiece pipe 10 is formed at the proximal end of the shaft portion 2. Further, at the base end of the shaft portion 2, when the shaft portion 2 is inserted into the pipe 10 to be processed and the end surface 16 of the pipe 10 abuts the tip surface 5 a of the outer flange portion 5, It has a crushing protrusion 3 that can be chamfered by crushing the inner peripheral corner 12 of the tip 11. As shown in the AA cross-sectional view of FIG. 3B, the protrusion 3 is integrally formed at the corner of the shaft portion 2 and the outer flange portion 5, and has an inclined pressure contact surface 3a.

  Further, when the shaft portion 2 is inserted into the pipe 10 and the end surface 16 is brought into contact with the tip surface 5a of the outer flange portion 5, the outer peripheral surface suppression piece that suppresses the escape (deformation) of the pipe 10 in the diameter increasing direction. 4 is provided. The suppression piece 4 is provided so as to protrude from the distal end surface 5a of the outer flange portion 5 in the distal end direction (insertion direction into the pipe). Further, two locations are provided facing each other with the shaft portion 2 interposed therebetween. Further, the suppression surface 4a facing the shaft portion 2 of the suppression piece 4 forms a curved portion toward the distal end portion after forming a straight portion at a predetermined height from the distal end surface 5a. Furthermore, the corners between the suppression surface 4a and the circumferential side surface 4b of the suppression piece 4 are chamfered into a curved surface. Further, the facing distance dimension of the opposing suppression surfaces 4a, 4a is set to a T dimension that is a value near (or equal to) an outer diameter dimension suitable for the pipe 10 to be inserted into a joint or the like.

Next, FIG. 5 is a perspective view showing a second reference example . First, the protruding portion 3 and the outer flange portion 5 are formed at the proximal end of the shaft portion 2 having the tapered portion 1 similar to the first reference example, and the suppression piece 4 is provided so as to protrude from the outer flange portion 5. Three shaft portions 2 are provided. Furthermore, it arrange | positions in Y shape (radial branch shape) so that the front-end | tip of three axial parts 2,2,2 may not face each other. Also, cylindrical connecting shaft portions 7, 7, and 7 are provided so as to protrude from the back surfaces 5b, 5b, and 5b of the outer flange portions 5, 5, and 5, and are joined together at a Y-shaped intersection. Yes. In other words, it can be said that the Y-shaped cylindrical body has a shape in which the shaft portion 2 is provided so as to protrude from each (three places) end portions.

  Here, the three shaft portions 2, 2, and 2 correspond to the pipes 10 to be processed having different diameters. That is, the diameter dimensions D of the straight portions 6, 6, and 6 of the three shaft portions 2, 2, and 2 are different from each other. Further, the T dimension of the facing distance of the suppression surface 4a of each of the shaft portions 2, 2, and 2 is set so as to correspond to an outer diameter suitable for insertion of a joint or the like of the pipe 10 to be machined having a different diameter. Yes.

The third reference example, as shown in FIG. 6, provided with a projection portion 3 and the suppression piece 4 facing shape (same circumferential positions), are provided suppression piece 4 in an arc shape along the circumferential direction.
In the fourth reference example, as shown in FIGS. 7 and 8, the protrusion 3 and the suppression piece 4 are approximately 5 ° to 45 ° when the protrusion 3 and the suppression piece 4 are viewed from the axial center direction of each shaft 2. It is preferable to dispose with a center angle difference of preferably 10 ° to 30 °. In this way, by shifting the position where the suppression piece 4 is disposed with respect to the protrusion 3, the suppression piece 4 can apply appropriate radial inward suppression to the outer peripheral surface of the pipe 10 for processing. The chamfered inner corner can be crushed beautifully. Furthermore, as shown in FIG. 7 and FIG. 8, the shape of the protrusion 3 is a round mountain shaped cross-sectional shape to which roundness (R) is given rather than that of FIGS. In addition, the chamfering of the tip of the shaft portion 2 is made two steps to facilitate insertion into the pipe 10.
Next , in the embodiment of the present invention, as shown in FIGS. 9 and 10, the side wall surface 4 b (on the side near the protrusion 3) of the protrusion 3 and the suppression piece 4 is approximately 0 ° to 30 °, preferably Are preferably arranged with a central angle difference of 2 ° to 10 °. In this way, by shifting the position where the suppression piece 4 is disposed with respect to the protrusion 3, the suppression piece 4 can apply appropriate radial inward suppression to the outer peripheral surface of the pipe 10 for processing. The chamfered inner corner can be crushed beautifully. Further, as shown in FIG. 9 and FIG. 10, four escape portions 8 of the shaft portion 2 are formed to facilitate insertion into the pipe 10.
Alternatively, the pressure contact surface 3a of the protrusion 3 may be formed into a concave curved surface instead of a slope, and the inner peripheral corner 12 of the pipe 10 may be crushed into an R curved surface. Further, an operating handle portion may be provided at the proximal end of the shaft portion 2. Although not shown in the drawings, the back surfaces 5b, 5b, 5b, 5b of the outer flange portions 5, 5, 5, 5 of the four shaft portions 2, 2, 2, 2 respectively corresponding to the processed pipes 10 of different diameters are provided. The connecting shaft portions 7, 7, 7, and 7 may be provided, and the connecting shaft portions 7, 7, 7, and 7 may be integrally formed in a cross shape (radial branch shape). (In other words, it may be a shape in which the shaft portion 2 is provided so as to protrude from each (four locations) of the cross-shaped cylindrical body.)

The usage method (action) of the above-described embodiment of the pipe tip processing tool according to the present invention will be described.
First, the pipe 10 to be processed is cut during the hot water supply / water supply pipe construction. Then, the end surface 16 (cut surface) of the pipe 10 is deformed by receiving the force of cutting, and is not a perfect circle. Therefore, it is necessary to make the inner diameter of the pipe into a shape and size suitable for insertion into a joint or the like. Further, the inner peripheral corner portion 12 of the pipe 10 needs to be chamfered for insertion into a joint or the like.

  Therefore, the tip 11 of the pipe 10 is processed by inserting the shaft 2 while rotating until the end face 5a of the outer flange 5 abuts against the end face 16 of the pipe 10. First, it is inserted into the pipe 10 along the tapered portion 1 of the shaft portion 2 up to the front of the straight portion 6. From the straight part 6, it inserts so that it may twist, rotating the axial part 2 in the fixed direction of the circumferential direction. Then, the inner diameter of the leading edge 11 of the pipe 10 is plastically deformed by the shaft portion 2 to the D dimension which is the outer diameter size of the shaft portion 2 in the diameter increasing direction, and the shape is also plastically deformed into a perfect circle. The outer peripheral surface of 10 is slidably contacted with the suppression surface 4 a along the tip of the protrusion 3. The suppression piece 4 suppresses plastic deformation in the expansion direction so that the outer diameter dimension of the pipe 10 does not become larger than the T dimension of the facing distance dimension of the suppression surface 4a, and the shape of the outer diameter is extremely flat or expanded. Suppress it from becoming. Next, after the inner peripheral corner 12 of the pipe 10 comes into contact with the pressure contact surface 3a of the crushing protrusion 3, the crushing protrusion 3 crushes the inner peripheral corner 12 of the most distal end 11 of the pipe 10, The peripheral corner 12 is formed in a chamfered shape. When the inner peripheral corner portion 12 is crushed, the outer diameter (outer peripheral surface) of the pipe 10 receives a force in the diameter expansion direction, but the suppression piece 4 suppresses escape in the diameter expansion direction and suppresses the outer diameter. It suppresses becoming larger than T dimension of the facing distance dimension of the piece 4, and suppresses deform | transforming into a shape unsuitable for insertion of a joint etc. Then, the front end surface 5 a of the outer flange portion 5 is brought into contact with the end surface 16 of the pipe 10. When the end face 16 is in contact with the front end face 5a and rotated once in the circumferential direction, the inner peripheral corner 12 of the tip 11 of the pipe 10 is surely chamfered along the circumference. This completes the processing.

  As another use procedure, the shaft portion 2 is inserted until the end surface 16 of the pipe 10 comes into contact with the front end surface 5a of the outer flange portion 5, and then rotated once in a constant direction in the circumferential direction of the shaft portion 2. The procedure is fine. At this time, the pipe 10 is plastically deformed so that the inner diameter of the pipe is the outer diameter dimension D of the shaft portion 2 in the direction of expansion, and the outer diameter (outer peripheral surface) of the tip 11 of the pipe 10 is T of the distance distance of the suppression piece 4. In addition to being suppressed within the dimensions, it is suppressed to an appropriate shape for a joint or the like. Further, the inner peripheral corner portion 12 of the most distal end 11 of the pipe 10 is crushed by the protruding portion 3 and formed into a chamfered shape. In other words, the pipe 10 is processed into the same shape regardless of which use procedure described above.

Here, the principal part expanded sectional view of the pipe 10 for a process after a process is shown in FIG.
In FIG. 4, the inner diameter of the tip 11 of the pipe is plastically deformed to a D dimension that is the length of the straight part 6 of the shaft part 2 from the end face 16 to a D dimension similar to the outer diameter dimension of the shaft part 2. Yes. The outer diameter dimension of the tip 11 of the pipe 10 is suppressed to the same T dimension as the facing distance dimension of the suppression piece 4, and the shape is also suitable for the insertion of a joint (not extremely flattened, contracted or expanded). ) It has a shape. Further, the inner peripheral corner portion 12 of the most distal end 11 of the pipe 10 is crushed (plastically deformed) into a chamfered shape.

  Next, in the embodiment, three shaft parts 2 are provided, and each of the shaft parts 2, 2, and 2 corresponds to different pipes 10 to be processed. The material suitable for the joint to be processed is selected, and the shaft portion 2 suitable for construction is inserted into the processed pipe 10. When the shaft portion 2 is rotated, the remaining shaft portions 2 and 2 that are not inserted and the connecting shaft portions 7 and 7 that protrude from the back surface 5b of the outer flange portion 5 are used as operation handles for rotation. . Then, the shaft portion 2 is rotated while being inserted into the pipe 10 until the end surface 16 of the pipe 10 abuts on the tip surface 5a of the outer flange portion 5 (or the end surface 16 of the pipe 10 is moved to the distal end surface 5a of the outer flange portion 5). Rotate after inserting until it touches). Then, the inner peripheral corner portion 12 of the tip 11 of the pipe 10 is formed in a chamfered shape, the inner diameter is plastically deformed to a D dimension suitable for fitting insertion, and the outer diameter (outer circumferential surface) is made of a joint or the like. The pipe 10 is processed while being prevented from being deformed into an inappropriate shape for insertion. That is, the pipe 10 is processed into a shape suitable for insertion of a joint or the like.

  As described above, the present invention includes the insertion shaft portion 2 for expanding and deforming, which has the taper portion 1 with a reduced diameter at the tip and is inserted into the pipe 10 to be processed and expands the inner diameter of the pipe 10 by plastic deformation. In addition, the proximal end of the insertion shaft portion 2 has a crushing protrusion 3 for crushing the inner peripheral corner portion 12 of the tip 11 of the pipe 10 into a chamfered shape. The part 12 can be chamfered. In addition, chip removal work and cleaning work are not required, and work efficiency is improved. In addition, since the insertion shaft portion 2 for expanding and deforming and the projection portion 3 for crushing are provided, the inner diameter of the pipe 10 can be plastically processed and chamfered (plastic), and the roundness of the inner diameter and outer diameter can be improved. And can be easily inserted into the joint. Further, chips are not caught between the seal member such as a joint and the pipe 10, so that the cause of leakage can be eliminated. In addition, since the plastic working and chamfering (plastic) machining of the inner diameter of the pipe 10 can be performed with one tool, the piping work can be performed quickly. In addition, since the inner peripheral corner 12 is chamfered by crushing, sharp burrs and scratches do not occur in the chamfered part compared to cutting, and a seal member (O-ring, packing, etc.) is inserted into the joint. It can be constructed without damaging it.

  The insertion shaft portion 2 has a diameter-reducing taper portion 1 and is inserted into the pipe 10 to be machined to expand the inner diameter of the pipe 10 by plastic deformation. Has a crushing projection 3 for crushing the inner peripheral corner portion 12 of the most advanced 11 of the pipe 10 into a chamfered shape, and is further slidably in contact with the outer circumferential surface of the most advanced 11 of the pipe 10. Since the outer peripheral surface suppression piece 4 that suppresses the leading edge 11 from escaping in the diameter expansion direction by the portion 3 is provided, plastic processing and chamfering (plasticity) processing of the inner diameter of the pipe 10 and deformation (relief) of the outer peripheral surface In addition, the roundness of the inner and outer diameters can be improved, and insertion into a joint or the like can be easily performed. Further, the inner peripheral corner portion 12 can be chamfered without generating chips. In addition, chip removal work and cleaning work are not required, and work efficiency is improved. Further, chips are not caught between the seal member such as a joint and the pipe 10, so that the cause of leakage can be eliminated. In addition, since the plastic working and chamfering (plasticity) processing of the inner diameter of the pipe 10 and the deformation of the outer peripheral surface can be suppressed with a single tool, piping construction can be performed quickly. In addition, since the inner peripheral corner 12 is chamfered by crushing, sharp burrs and scratches do not occur in the chamfered part compared to cutting, and a seal member (O-ring, packing, etc.) is inserted into the joint. It can be constructed without damaging it. Further, it is possible to prevent the outer peripheral surface of the pipe 10 from being inadequate for insertion of a joint or the like (extremely flat or expanded diameter). Further, since the escape is suppressed by the suppression piece 4, the inner peripheral corner portion 12 of the tip 11 of the pipe 10 can be surely chamfered by the crushing projection 3. Moreover, it can be processed into a shape suitable for the insertion of a pipe joint having a concave circumferential groove on the outer periphery and a sealing material fitted in the concave circumferential groove and having an inner cylindrical portion.

In addition, since the outer flange portion 5 is formed at the base end of the insertion shaft portion 2 and a plurality of outer peripheral surface suppression pieces 4 are disposed so as to protrude from the outer flange portion 5, the outer peripheral surface can be reliably deformed (escaped). Can be prevented. Moreover, it can be used as a grip part when rotating the outer collar part 5.
Further, since the three to four insertion shaft portions 2, 2, and 2 are arranged in a radial branch shape, machining of the pipe 10 to be machined with different diameters can be handled with one tool. Further, the shaft portions 2 and 2 that are not used can be used as an operation handle for rotation.

It is a perspective view explaining the 1st reference example of a pipe tip processing tool, and a processed pipe. It is a principal part expansion explanatory drawing. It is sectional drawing which shows a use condition, (a) is a partial plane sectional view, (b) is AA sectional drawing of (a). It is principal part side surface sectional drawing which shows the state after the process of a to-be-processed pipe. It is a perspective view which shows the 2nd reference example . It is a top view which shows the 3rd reference example . It is a perspective view which shows the 4th reference example . It is a top view which shows the 4th reference example . Is a perspective view showing the form of implementation. Is a plan view showing the form of implementation.

DESCRIPTION OF SYMBOLS 1 Tapered part 2 Shaft part 3 Protrusion part 4 Suppression piece 5 Outer flange part 5a Tip surface 8 Escape part
10 pipes
11 cutting edge
12 Inner corner

Claims (1)

Insertion for expanding the diameter of the pipe (10) having a reduced diameter tapered portion (1) and inserting into the pipe (10) to be machined to enlarge the inner diameter of the pipe (10) by plastic deformation and correct it into a perfect circle. A shaft portion (2), and an outer flange portion (5) formed at a proximal end of the insertion shaft portion (2), and the proximal end of the insertion shaft portion (2) and the outer flange portion. The inner peripheral corner (12) of the tip (11) of the pipe (10) is crushed at the corner of the tip surface (5a) of (5) by the circumferential rotation of the insertion shaft (2). And have two crushing protrusions (3) for chamfering,
In the outer collar portion above the tip face of the (5) (5a), in sliding contact with the outer peripheral surface of the cutting edge (11) of the pipe (10), the protruding portions above advanced (11) by (3) Two arcuate outer circumferential surface suppression pieces (4) along the circumferential direction of the insertion shaft portion (2) for suppressing escape in the diameter-expanding direction are disposed in a projecting manner,
The outer circumferential surface suppression piece (4) is provided in a face-to-face manner with the insertion shaft portion (2) in between, and the outer circumferential surface suppression piece (4) is seen from the axial direction of the insertion shaft portion (2). Disposed in the circumferential direction of the insertion shaft (2) with respect to the protrusion (3),
Further, the insertion shaft portion (2) is provided with a plurality of relief portions (8) formed with a plane,
Three to four corresponding insertion shafts (2) corresponding to the pipes (10) having different inner diameters are arranged in a radial branch shape, and the insertion shafts (2) A pipe tip processing tool , wherein the outer flange (5), the protrusion (3), and the outer circumferential surface suppression piece (4) are disposed in each .

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