JP2005188643A - Manufacturing method of lock ring for pipe joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a lock ring for a pipe joint by which both reliable coupling and smooth detachment can be achieved in a high performance. <P>SOLUTION: By deforming a plate, a ring-like crest part 40A which has a horizontally V-shaped cross section and a bottom part 40B flat on the inner periphery side which has a horizontally V-shaped cross section are formed. The bottom part 40B is cut by a bent part between the crest part 40A and the bottom part 40B. The horizontally V-shaped inner periphery side tip 42 of the crest part 40A is shaped so as to open further in a direction in which the horizontally V-shaped opening is expanded with respect to an inner periphery side midway 41. By bending the inner periphery side of the crest part 40A, the horizontally V-shaped opening is expanded so that a clearance angle β formed by the horizontally V-shaped inner periphery side utmost tip 43 with a cutting direction of the bottom 40B is set to be 5-45°. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method of manufacturing a lock ring for coupling in a pipe joint that can be coupled and detached by a one-touch operation, and in particular, a pipe that can securely grip the surface of the tubular body. The present invention relates to a method for manufacturing a joint lock ring.

  Pipe joints that can be joined and detached by one-touch operation have already been widely used. FIG. 5 is a reference view (half-sectional view) showing such a pipe joint, and the joint body is composed of a brass main body portion 10, a synthetic resin sleeve 11, and a synthetic resin intermediate portion 12. ing. Further, a circumferential groove is formed in the core 10 </ b> A integrated with the main body portion 10, and an O-ring is mounted as an elastic seal ring 13 in the circumferential groove.

  A bottomed fitting hole is formed by the main body portion 10, the sleeve 11, and the intermediate portion 12, and the release ring 30 and the lock ring 40 or 60 are fitted into the fitting hole. That is, the release ring 30 that can be moved back and forth and the lock ring 40 or 60 that can be expanded and contracted are arranged in order from the fitting hole side. The lock ring 40 shows the case of the lock ring of the present invention, and the lock ring 60 shows the case of the conventional lock ring.

  In order to couple the pipe body 50 in such a pipe joint, the pipe body 50 may be simply inserted into the fitting hole of the joint body. Then, the tube 50 passes through the inside of the release ring 30 as it is, and stops in contact with the lock ring 40 or 60 whose cross section is> -shaped, or the release ring 30 is moved deeper by inserting the tube 50. After that, it comes into contact with the lock ring 40 or 60 and stops.

  If the tube 50 is further inserted, the lock ring 40 or 60 has a> -shaped opening side on the deep side of the joint body, so that the surface of the tube 50 pushes the inner peripheral side of the lock ring 40 or 60. It will spread, and finally passes through the elastic seal ring 13 and reaches the deepest part of the fitting hole of the joint body.

  When the internal pressure is applied in this state, the pipe body 50 receives a force in a direction away from the joint body, but as shown in FIG. 5, the most distal portion on the inner peripheral side of the lock ring 40 or 60 bites into the surface of the pipe body 50. As a result, separation of the tube body 50 is prevented. On the other hand, in order to detach the tube body 50, the release ring 30 may be pushed in. Then, as a result of the distal end of the release ring 30 expanding the lock ring 40 or 60, the biting of the lock ring 40 or 60 with respect to the surface of the tube body 50 is released, and the tube body 50 can be pulled out.

As described above, when the tube body 50 is connected or detached, the inner peripheral side of the lock ring 40 or 60 is deformed. However, the conventional lock ring 60 has a simple cross-sectional shape as shown in FIG. There was only. And the conventional lock ring 60 is not a continuous ring shape but is a discontinuous one having the cut portions 61, and the diameter of the cut portions 61 is increased or decreased by changing the interval of the cut portions 61. In order to make it easy, the notch 62 was provided (for example, refer patent document 1).
JP 2001-304476 A (Page 4, FIG. 2)

  However, the conventional lock ring 60 shown in FIG. 6 has a simple> -shaped cross section even when the diameter of the cut portion 61 is enlarged or reduced. There is room.

  That is, as shown in FIG. 5, the lock ring 40 or 60 has the innermost distal end gripping the surface of the tube body 50, so that the lock ring 40 or 60 is securely connected to the tube ring 50. The angle formed by the innermost peripheral portion of the tube 50 and the surface of the tube 50 is important.

  Here, when the angle is large, the innermost peripheral most distal end portion is easily bitten, so that the coupling of the tubular body 50 is ensured. However, if the angle is large, the distal end of the release ring 30 is difficult to push and spread the lock ring 40 or 60, so that it is difficult to smoothly remove the tube body 50. Conversely, if the angle is small, the tube 50 can be easily detached, but there is a concern that the coupling will be insufficient. Therefore, in the conventional lock ring 60 shown in FIG. 6 having a simple cross-sectional shape that is simple, it is difficult to achieve both reliable coupling and smooth detachment of the tube body 50.

  Further, in order to ensure the coupling of the tube bodies 50, not only the cross-sectional shape of the lock ring 60 as shown in FIG. 6, but also the shape of the innermost peripheral portion 63 is important. That is, when the inner peripheral side most advanced portion 63 has an acute angle, the inner peripheral side most advanced portion 63 is easy to bite, so that the coupling of the tubular body 50 is facilitated. However, if the angle is too acute, the innermost distalmost portion 63 bites deeply into the tube 50 and cannot be removed, making it difficult to smoothly remove the tube 50. Conversely, if the angle is an obtuse angle, the tube body 50 can be easily detached, but there is a concern that the coupling will be insufficient.

  Therefore, when the inner peripheral side most distal portion 63 is crushed as in the prior art, it is difficult to form the tip edge angle at a desired angle, and the sharp shape itself is insufficient. In addition, there is a problem that the crushing mold is severely worn and damaged, requiring frequent replacement.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a method for efficiently and efficiently manufacturing a lock ring for a pipe joint that can achieve both highly reliable coupling and smooth detachment of the pipe body. It is.

  The present invention has been made to solve the above problems, and the gist of the present invention is a method of manufacturing a lock ring for a pipe joint that is inserted into a fitting hole of a joint body and grips the surface of the pipe body. The flat plate is deformed to form a ring-shaped crest having a cross-section of a letter shape, and a flat bottom portion on the inner periphery side of the letter-shape, and then the bottom portion is bent by a bent portion between the crest and the bottom. By cutting, the inner peripheral side tip portion of the peak shape is further opened in the direction of enlarging the> shaped opening with respect to the inner peripheral side intermediate portion, and the tip edge angle α is 45 to 45 mm. The present invention relates to a manufacturing method of a lock ring for a pipe joint that forms the innermost peripheral portion of 85 °.

  And preferably, the inner peripheral side of the ridge is opened to enlarge the> shaped opening, or the inner peripheral side of the ridge is bent to enlarge the> shaped opening, and> Relates to a method of manufacturing a lock ring for a pipe joint in which the clearance angle β formed by the cutting direction of the bottom portion is 5 to 45 °.

  In the method of manufacturing a lock ring for a pipe joint according to the present invention, a flat plate is deformed to form a ring-shaped crest having a> -shaped cross section and a flat bottom on the inner peripheral side of the> -shaped, The bottom part is cut at the bent part between the peak part and the bottom part, and the inner peripheral side tip of the peak part is further opened in the direction of enlarging the letter-shaped opening with respect to the inner peripheral side intermediate part. In addition, since the tip end portion on the inner peripheral side having a tip edge angle α of 45 to 85 ° is formed, the tip end portion on the inner peripheral side of the lock ring can be sharpened easily and reliably.

  First, in order to facilitate understanding of the method for manufacturing a lock ring for a pipe joint of the present invention, a pipe joint including a joint body, a lock ring, and a release ring will be described. Here, the joint body is formed with a fitting hole having a conical inner peripheral inclined surface having a small diameter on the inlet side and a large diameter on the deep side. A lock ring is inserted into the fitting hole, and a release ring is fitted. The material of the joint body may be a metal or a synthetic resin. However, in terms of cost and the manufacturing process, a synthetic resin that can be injection-molded is preferred.

  Next, the cross section of the lock ring has a> character shape, and is inserted into the fitting hole of the joint body with the> character shape opening side facing the deep portion. For this reason, the> -shaped inner peripheral side distal end bites into the surface of the tubular body, and the tubular body is coupled. Note that the lock ring can be formed of a desired hard material, and if it is made of metal, the lock ring is more surely bite into the outer peripheral surface of the tube body.

  On the other hand, the release ring has a structure in which the outer periphery of the tip abuts against the inner periphery side of the lock ring. Therefore, if the release ring is pushed into the deep part side of the joint main body, the biting of the lock ring is released by the outer periphery of the distal end of the release ring, and the tubular body can be detached. The material of the release ring may be a metal or a synthetic resin, but a synthetic resin that can be injection-molded is preferable in terms of cost and manufacturing process. In addition, the release ring can be cut in the vertical direction so that it can be elastically deformed in the radial direction of the fitting hole, but may be not cut and not deformed.

  The greatest feature of the lock ring for a pipe joint manufactured by the method of the present invention is that the> -shaped inner peripheral side tip portion of the lock ring is in the direction of enlarging the> -shaped opening with respect to the inner peripheral side intermediate portion. Further, it is in an open shape. That is, the angle formed between the> -shaped inner peripheral side tip portion of the lock ring and the surface of the tubular body is larger than that of the inner peripheral side intermediate portion. Therefore, when the joint body and the pipe body are coupled, the> -shaped inner peripheral side tip portion of the lock ring easily bites into the surface of the pipe body, and the coupling is ensured.

  When the tube is detached, the tip of the release ring comes into contact with the inner periphery of the lock ring, which has a relatively small angle with the surface of the tube, so that the release ring can easily spread the lock ring. Smooth disengagement is possible. Thus, according to the lock ring for a pipe joint manufactured by the method of the present invention, it is possible to achieve both highly reliable coupling and smooth detachment of the pipe body.

  Here, in particular, if the innermost side of the inner periphery side of the lock ring is a sharp shape, it becomes easier to bite into the surface of the tubular body. And for this ease of biting, when the pipe body is inserted into the tip edge angle α of the innermost end of the inner peripheral side, the fitting hole of the joint body, the innermost end of the inner periphery side of the lock ring The clearance angle β formed by the surface of the tubular body, and the angle γ, which is the direction perpendicular to the surface of the tubular body, of the> -shaped inner peripheral side of the lock ring are important.

  That is, in order for the leading edge of the inner side of the lock ring to effectively bite into the surface of the tubular body, the tip edge angle α is 45 to 85 °, the clearance angle β is 5 to 45 °, and the rake angle γ Is preferably 0 to 10 °. Here, the optimum angle varies depending on the material of the tube, and, for example, if the tube is easy to bite, it is preferable that the tip edge angle α is close to 85 ° and the clearance angle β is small, and conversely, the tube is difficult to bite. Then, it is preferable that the tip edge angle α is close to 45 ° and the clearance angle β is increased. By doing in this way, according to the material of a tubular body, etc., it is possible to achieve both reliable coupling and smooth detachment.

  Next, the manufacturing method of this invention for setting it as such a lock ring for pipe joints is demonstrated. That is, in order to manufacture such a lock ring, the flat plate is first deformed to form a ring-shaped crest having a> -shaped cross section and a flat bottom on the inner peripheral side of the> -shaped. Next, the bottom portion is cut to form a ring shape. At this time, the bottom portion is cut at a bent portion between the peak portion and the bottom portion. As a result, the bent portion becomes a tip shape on the inner periphery side of the> character shape, and a shape further opened in the direction of enlarging the> character shape opening with respect to the inner periphery side intermediate portion of the peak portion.

  Moreover, since the bottom part is cut at the bent part, the tip part on the inner peripheral side of the peak part has a sharp shape. The tip edge angle α is in the range of 45 to 85 °, but this angle can be appropriately set by adjusting the cutting position of the bent portion. In order to set the clearance angle β to 5 to 45 °, the inner peripheral side of the peak is opened and the> shaped opening is enlarged, or the inner peripheral side of the peak is bent and the> shaped opening is enlarged. Good.

Hereinafter, the manufacturing method of the lock ring for pipe joints of the present invention will be described in more detail with reference to the drawings.
1 to 3 are cross-sectional views showing a method for manufacturing a lock ring for a pipe joint according to the present invention. FIG. 1 shows an example of the first step, FIG. 2 shows an example of the second step, and FIG. The other example of 2 processes is shown. That is, in order to manufacture the lock ring for a pipe joint of the present invention, as shown in FIG. 1 (A), a flat plate is first deformed, and a ring-shaped peak portion 40A having a> -shaped cross section and a> -shaped An inner peripheral flat bottom 40B is formed. In the example shown in FIG. 1, the crest 40A and the bottom 40B are formed by press molding.

  Next, on the jig as shown in FIG. 1 (A), as shown in FIG. 1 (B), the bottom portion 40B is cut at the bent portion between the peak portion 40A and the bottom portion 40B. Then, as shown in an enlarged view in FIG. 1 (B), the innermost peripheral most distal portion 43 of the mountain portion 40A has a sharp shape. In the example shown in FIG. 1, the tip edge angle α is 60 °, but this angle can be changed by adjusting the cutting position of the bent portion.

  As described above, in the first step shown in FIG. 1, the lock ring has a shape in which the> -shaped inner peripheral side tip portion 42 is further opened in the direction of enlarging the> -shaped opening with respect to the inner peripheral side intermediate portion 41. However, in the embodiment, the> -shaped opening is further enlarged so that the clearance angle β formed by the cutting direction of the bottom 40B of the> -shaped inner peripheral side most distal end portion 43 is 20 °. Yes.

  For example, FIG. 2 is a diagram showing an example of forming the clearance angle β. In the example shown in FIG. 2, the inner side of the peak portion 40A formed by the method shown in FIG. Is shown, and the manufacturing method of the lock ring 40 is shown in which the clearance angle β formed by the> -shaped inner peripheral side most distal portion 43 and the cutting direction of the bottom portion 40B is 20 °.

  That is, as shown in FIG. 2B, the final angle that the> -shaped inner peripheral side tip 42 of the crest 40A of the lock ring 40 makes with the cutting direction of the bottom 40B shown in FIG. . In this case, as shown in FIG. 2 (A), when cutting the bottom portion 40B, first, the angle θ ′ formed by the> -shaped inner peripheral side of the peak portion 40A and the cutting direction of the bottom portion 40B is made smaller than θ. deep. Next, as shown in FIG. 2 (B), the inner peripheral side of the peak portion 40A is bent, the> -shaped opening is enlarged, and the clearance angle β (β = θ−θ ′) is 20 ° (the craving angle γ is 10 °) to obtain the lock ring 40 (Example 1). In addition, what is necessary is just to press bending, for example for the bending of the inner peripheral side of the peak part 40A.

  FIG. 3 is a view showing another example of forming the clearance angle β. In the example shown in FIG. 3, the inner peripheral side of the peak portion 40A formed by the method shown in FIG. A method of manufacturing the lock ring 40 is shown in which the letter-shaped opening is enlarged so that the clearance angle β between the innermost side 43 of the letter-shaped side and the cutting direction of the bottom 40B is 20 °.

  That is, as shown in FIG. 3B, the final angle that the> -shaped inner peripheral side 41 of the peak 40A of the lock ring 40 makes with the cutting direction of the bottom 40B shown in FIG. . In this case, as shown in FIG. 3A, when cutting the bottom portion 40B, first, an angle θ ′ formed by the inner circumference side of the peak shape of the peak portion 40A and the cutting direction of the bottom portion 40B is set to θ (θ = 30 °). ) (Θ ′ = 10 °). Next, as shown in FIG. 3B, the inner peripheral side of the peak portion 40A is opened to enlarge the> -shaped opening, and the clearance angle β (β = θ−θ ′) is 20 ° (the craving angle γ is 10 °) to obtain the lock ring 40 (Example 2). Note that, when the inner peripheral side of the peak portion 40A is opened, cracks are likely to occur inside the top of the peak portion 40A. Therefore, the method of bending the inner peripheral side of the peak portion 40A (the method shown in FIG. 2) is preferred.

  FIG. 4 is a partial detail view showing a pipe joint using a pipe joint lock ring manufactured by the method of the present invention. That is, FIG. 4 is a partial detail view when the lock ring 40 of the second embodiment shown in FIG. 3B is used in the pipe joint shown in FIG. Here, the coupling between the pipe joint and the pipe body 50 shown in FIG. 4 will be described. When the pipe body 50 is attached or separated, the release ring 30 is idle as shown in FIG. The lock ring 40 is in contact with the tubular body 50 but is not in contact with the inner peripheral inclined surface 16 of the sleeve 11.

  However, when the tube body 50 is pulled in the pulling direction or pressed toward the inlet side by the fluid inside, the lock ring 40 and the release ring 30 move toward the inlet side as the tube body 50 moves. When the tube body 50 further moves, the outer peripheral surface of the lock ring 40 is compressed by the inner peripheral inclined surface 16, and the inner peripheral side most distal portion 43 of the lock ring 40 bites into the surface of the tube body 50. This state is a state shown in FIG. 4B, in which the tubular body 50 is coupled.

  Here, as shown in FIG. 3B, the lock ring 40 further extends in a direction in which the> -shaped inner peripheral side distal end portion 42 expands the> -shaped opening with respect to the inner peripheral side intermediate portion 41. The leading edge 43 on the inner peripheral side has a sharp shape with a tip edge angle α of 60 °, a clearance angle β of 20 °, and a rake angle γ of 10 °. Therefore, the inner peripheral side most distal end portion 43 of the lock ring 40 easily bites into the surface of the tubular body 50, and the tubular body 50 is securely coupled as shown in FIG. 4B.

  Moreover, when the tube body 50 is detached, the tip of the release ring 30 contacts the inner peripheral side intermediate portion 41 having a relatively small angle with the surface of the tube body 50, so that the release ring 30 pushes the lock ring 40. Easy to spread and smooth disengagement. That is, in order to detach the tube body 50, the end of the release ring 30 may be pushed into the joint body as shown in FIG. 4A in the coupled state shown in FIG. 4B. Then, the distal end of the release ring 30 comes into contact with the> -shaped inner peripheral side intermediate portion 41 of the lock ring 40 to release the lock ring 40 from biting into the tube body 50. And if it pulls out the pipe body 50 in this state, it can be made to detach | leave smoothly.

  According to the method for manufacturing a lock ring for a pipe joint of the present invention, a lock ring for a pipe joint that can achieve both highly reliable coupling and smooth detachment of the pipe body with high accuracy and efficiency is efficiently manufactured. be able to. Therefore, it can be widely used as a manufacturing method of a lock ring for a pipe joint used for a pipe joint of various pipes.

It is sectional drawing which shows the manufacturing method of the lock ring for pipe joints. (Common to Example 1 and Example 2) It is a figure which shows the process of forming clearance angle (beta) further in the lock ring for pipe joints shown in FIG. (Example 1) It is a figure which shows the process of forming clearance angle (beta) further in the lock ring for pipe joints shown in FIG. (Example 2) It is a partial detail drawing which shows the pipe joint using the lock ring of Example 2. FIG. It is a reference figure (half cut sectional view) showing a pipe joint. It is the front view and sectional drawing which show the lock ring for pipe joints. (Conventional example)

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Main body part which becomes a part of joint main body 10A Core integrated with main body part 11 Sleeve which becomes a part of joint main body 12 Intermediate part which becomes a part of joint main body 13 Elastic seal ring 16 Inner peripheral inclined surface 30 of sleeve Release ring 40 Lock ring 40A Crest 40B Bottom 41 Lock ring inner peripheral side intermediate part 42 Lock ring inner peripheral side tip part 43 Lock ring inner peripheral side most advanced part 50 Tubular body 60 Lock ring 61 Lock ring cutting part 62 Lock ring notch 63 Lock ring innermost edge

Claims (3)

  A method of manufacturing a lock ring (40) for a pipe joint that is inserted into a fitting hole of a joint body and grips the surface of the pipe body (50). Part (40A) and a flat bottom part (40B) on the inner periphery side of the> character shape, and then cutting the bottom part (40B) at the bent part between the peak part (40A) and the bottom part (40B) Then, the> character-shaped inner peripheral side tip portion (42) of the peak portion (40A) is further opened in the direction of enlarging the> character-shaped opening with respect to the inner peripheral side intermediate portion (41). The method for manufacturing a lock ring for a pipe joint is characterized by forming the innermost peripheral most distal end portion (43) having a tip edge angle α of 45 to 85 °.   Open the inner peripheral side of the ridge (40A) to enlarge the> shaped opening, and the clearance angle β between the cutting edge of the inner peripheral side of the> shaped (43) and the cutting direction of the bottom (40B) is 5 to 45 ° The manufacturing method of the lock ring for pipe joints according to claim 1, wherein: Bending the inner peripheral side of the crest (40A) to enlarge the> -shaped opening, and the clearance angle β between the cutting edge of the inner peripheral side of the> -shaped (43) and the cutting direction of the bottom (40B) is 5 to 45 ° The manufacturing method of the lock ring for pipe joints according to claim 1, wherein:

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