KR101142573B1 - Method of manufacturing a lock ring for a pipe joint - Google Patents

Abstract

It is an object of the present invention to provide a method of manufacturing a locking ring for a pipe joint which does not require as much force as the conventional inserting of the tube and improves durability. As the manufacturing method of the lock ring 1 which the outer end support part 3 abuts on the accommodating part H in a pipe joint, and the locking part 6 of an inner end side penetrates and fixes to the inserted tube T, The said lock is provided. A punching process for punching the metal plate 7 and a bending process for three-dimensional bending of the punched metal plate 7 so that the contour of the ring 1 is formed, and a joint portion between the metal plate and the lock ring 1 part ( And a dividing process for separating the portion 16, wherein the dividing position 17 of the joint portion 16 between the metal plate 7 and the lock ring 1 portion is formed at the outer end support portion 3 of the lock ring portion 1. The diameter is set at a position smaller than the maximum outer diameter portion.

Description

Manufacturing method of locking ring for pipe joint {METHOD OF MANUFACTURING A LOCK RING FOR A PIPE JOINT}

1 is a half cross-sectional view illustrating a pipe joint according to Embodiment 1 of the method for manufacturing a lock ring for pipe fitting according to the present invention.

FIG. 2 is a plan view for explaining a metal plate and a locking ring before blanking by a punch in the method for manufacturing a locking ring for a pipe joint of FIG. 1; FIG.

3 is an enlarged view of a main part of FIG. 2;

Fig. 4 is an enlarged view of the main part of the metal plate and the lock ring before punching by punching, which describes the second embodiment of the method for manufacturing a lock ring for a pipe joint according to the present invention;

Fig. 5 is an enlarged view of the main part of the metal plate and the locking ring before punching by punching, which describes Embodiment 3 of the manufacturing method of the pipe joint locking ring of the present invention;

6 is a view for explaining the durability test of the joint;

7 is a graph showing the locking ring friction force against the pingauge diameter,

8 is a plan view for explaining the basic structure of the locking ring for a joint;

9 is a view for explaining a method for manufacturing a conventional lock ring for pipe joints,

10 is an enlarged view of a main part of FIG. 9;

11 is a view for explaining a process of punching and cutting a punch in a joint between a conventional metal plate and a lock ring (before punching),

12 is a view for explaining a process of punching and cutting a punch in a joint between a conventional metal plate and a lock ring (during punching),

FIG. 13 is a half sectional view illustrating a pipe joint in which a lock ring is incorporated in a conventional method for manufacturing a lock ring for a pipe joint.

14 is an enlarged view of a main part of FIG. 13.

* Explanation of symbols for main parts of drawing

 1: Locking ring 3: Outer end support

 5: arm part 6: locking part

 7: metal plate 16: joint part

17: dividing position T: tube

 H: receiving part

The present invention relates to a method for producing a lock ring for a pipe joint for connecting a tube.

Conventionally, a pipe joint for connecting a tube is known (see, for example, Japanese Patent Laid-Open No. 2004-232724 (pages 4 to 6, Fig. 4)).

The pipe joint is a method in which the locking ring 1 (shown in FIG. 8) is inserted and fixed when the inserted tube (piping) is displaced in a direction in which the inserted tube (piping) is displaced. The said lock ring 1 has the area | region 2 (bending line) whose cross section is substantially "ku" shape, and both inside and outside are bent toward the tube insertion direction (inner side of a pipe joint). The locking ring 1 includes a plurality of ribs 4 having an outer end supporting portion 3, an approximately radial arm portion 5 connecting them, and a locking portion (fixed ring) on the inner end side thereof. (6) is provided.

As shown in Fig. 9, the locking ring 1 is manufactured by punching out of the metal plate 7. As shown in Fig. 9A, the metal plate 7 is punched out so that the outline of the locking ring 1 is formed, and the three-dimensional bending is performed as shown in Fig. 9B. As shown in FIG. 10, at this point, the metal plate (not shown) and the lock ring 1 are connected to the joint 8. Thereafter, as shown in FIG. 11 and FIG. 12, punching is performed by punching P at the joint 8 of the metal plate (not shown) and the lock ring 1.

However, as shown in Fig. 12, the fine and small protrusions 9 are inclined along the direction in which the locking ring 1 is punched with respect to the joint portion 8 (see Fig. 11) after the three-dimensional bending process. Is formed. In this case, as shown in Figs. 13 and 14, when the inner diameter of the locking ring 1 is expanded to the outer diameter of the tube T when the tube T is inserted into the pipe joint, Since the small protrusion 9 comes into contact with and interferes with the seam-embedded member 10 at an early stage, the force for expanding the diameter for rotating the locking ring 1 inward when the tube T is inserted increases, and the tube T ), There is a problem that requires a large force by the insertion.

In addition, in the case where the minute and small projections 9 protrude and are formed only on some of the outer end supporting portions of the plurality of outer end supporting portions 3 (in FIG. 9, six joint portions 8 of the 12 outer end supporting portions 3 are formed). The small and small projection 9 is formed), and the outer end support 3 with the small and small protrusion 9 first comes into contact with and interferes with the seam-embedded member 10, and the outer end support 3 is formed. Only when the stress from the tube T was concentrated and broken easily, there existed a problem that durability as the lock ring 1 might fall as a result.

Therefore, it is an object of the present invention to provide a method for manufacturing a locking ring for a pipe joint which does not require as much force as the conventional inserting of a tube and also improves durability.

In order to solve the above problems, the present invention seeks the following technical means.

(1) The method for manufacturing a lock ring for a pipe joint according to the present invention is a method for manufacturing a lock ring in which an outer end support portion is in contact with a receiving portion in the pipe joint, and a locking portion of the inner end side is dug into and fixed to an inserted tube. A blanking process for punching a metal plate to form a contour of a ring, a bending process for three-dimensional bending of the punched metal plate, and a splitting process for separating a joint portion between the metal plate and the locking ring part, The parting position of the joint part of the said metal plate and a lock ring part is set to the position of diameter smaller than the largest outer diameter part of the outer end support part of a lock ring part.

The manufacturing method of the lock ring includes a punching process for punching a metal plate to form a contour of the lock ring, a bending process for three-dimensional bending of the punched metal plate, and a separation for separating the joint portion between the metal plate and the lock ring part. Although the process includes, the minute unit value of the joint portion between the metal plate and the lock ring portion is set at a position smaller in diameter than the maximum outer diameter portion of the outer end support portion of the lock ring portion, even when a minute and small protrusion occurs at the segment position. And the small protrusion is positioned at a diameter smaller than the maximum outer diameter portion of the outer end support of the locking ring portion.

Then, when using the seam, the fine and small protrusions in the process of expanding the inner diameter of the locking ring to the outer diameter of the tube when inserting the tube are smaller than the maximum outer diameter of the outer end support of the locking ring. In this case, a contact or interference with the joint embedded member does not occur, and a situation in which a situation of increasing the force for expanding the diameter when the locking ring is rotated inward by pressing the tube is not generated.

Thus, the lock ring can be configured to include, for example, a plurality of ribs having an outer end support portion, an approximately radial arm portion connecting them, and an engaging portion on the inner end side that penetrates the tube.

In addition, the durability as a lock ring is improved as compared with the case in which fine and small protrusions protrude and form only in some of the conventional locking portions.

(2) The unit value of the joint part of the said metal plate and the lock ring part may be set in the outer peripheral side of the substantially radial arm part which connects an outer end support part.

In this way, when the outer periphery of the arm portion is formed, a relatively large punching punch can be used without being influenced by the shape of the lock ring, so that the punch for punching the metal plate is not easily broken. In addition, if the minute value is installed on one side of the outer end support of the locking ring, the number of punches for punching the sheet metal can be made half as long as there are joints on both sides. There is an advantage that the deformation is less likely to occur in the ring.

(3) The minute unit value of the joint portion between the metal plate and the lock ring portion may be set on the outer circumferential side of the engaging portion on the inner end side that penetrates into the tube.

(4) The pipe joint provided with the lock ring manufactured by the method for manufacturing the lock ring for pipe fittings is excellent in that the structure of the lock ring does not require as much force as the conventional one when the tube is inserted.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)

As shown in Figs. 1 to 3, the outer ring support part 3 is in contact with the receiving portion H in the pipe joint body X of the pipe joint lock ring 1 (see Fig. 8) of the present embodiment. When the internal pressure acts on the inserted tube T and displaces it in the disengaging direction, the locking portion 6 (fixed ring) 6 on the inner end side of the locking ring 1 is recessed and fixed.

Specifically, the locking ring 1 has an area 2 (bending line) having a substantially "shaped" cross section, and its inner and outer ends face the tube T insertion direction (inside the joint). It has a plurality of ribs 4 which are bent and have an outer end support 3, an approximately radial arm portion 5 connecting them, and an engaging portion 6 on the inner end side which is inserted into the tube T. It is a structure.

As shown in FIG. 1, the pipe joint having the locking ring 1 releases a release 11 for pulling the locking ring 1 into the tube T by pressing the locking ring 1 inward, and pulling it out. The inner cylinder 12 for fixing the tube T fixedly installed in the joint main body X, the annular packing 13, and the locking ring 1 or the release 11 are disposed in the joint main body X. An inner member (back ring) 14 and a fall prevention material 15 of the inner member 14 are provided.

Here, the method for manufacturing the locking ring for the pipe joint is a punching process for punching the metal plate 7 so that the contour of the locking ring 1 and the three-dimensional bending process of the punched metal plate 7 And a separating step of separating the joint 16 of the metal plate 7 and the lock ring 1 member.

2 and 3, the divided position 17 of the joint portion 16 between the metal plate 7 and the lock ring 1 portion is an outer end support portion of the lock ring 1 portion. It is set in the position of diameter smaller than the largest outer diameter part of 3). As shown in FIG. 3, specifically, the divided position 17 of the joint portion 16 between the metal plate and the lock ring 1 portion is an approximately radial arm portion connecting the outer end support portion 3. It is set on both sides of the outer peripheral side of 5).

Next, the use state of the manufacturing method of the lock ring for pipe joints of this embodiment is demonstrated.

The manufacturing method of the lock ring includes a punching process for punching the metal plate 7 so that the outline of the lock ring 1 is formed, a bending process for three-dimensional bending of the punched metal plate 7, and the metal plate 7. ) And a jointing process for separating the joint 16 from the locking ring 1 part, but as shown in FIGS. 2 and 3, the joint part between the metal plate 7 and the locking ring 1 part. The dividing position 17 of (16) is set at the position of the diameter smaller than the largest outer diameter part of the outer end support part 3 of the lock ring 1 part, and a fine and small protrusion generate | occur | produces in the dividing position 17. Even if the minute and small projections are smaller than the maximum outer diameter portion of the outer end supporting portion 3 of the locking ring 1 portion, the diameter is smaller.

Then, when using the pipe joint, when the inner diameter of the locking ring 1 is enlarged to the outer diameter of the tube T when the tube is inserted, fine and small protrusions are formed at the outer end of the locking ring 1 part. It becomes the position of diameter smaller than the maximum outer diameter part of the support part 3, and it does not generate | occur | produce contact or interference with the inner member (back ring) 14 which is a seam built-in member, and presses the lock ring 1 by pressing the tube T. The situation in which the situation of increasing the force for expanding the diameter in the case of rotating inwardly does not occur, has the advantage that the force of inserting the tube T is not required as large as conventionally.

In addition, as shown in FIG. 3, the divided position 17 of the joint 16 between the metal plate and the lock ring 1 portion is an approximately radial arm portion 5 connecting the outer end support 3. Is set on the outer circumferential side, and a punching punch of a metal plate is not easily broken since a relatively large punching punch can be used without being influenced by the shape of the lock ring. In addition, since the dividing position 17 is provided on both sides of the outer end supporting portion 3 of the locking ring 1 part, there is an advantage that deformation is hardly generated in the locking ring subjected to the three-dimensional bending process.

(Embodiment 2)

It demonstrates centering around difference with the said 1st Embodiment.

As shown in FIG. 4, the method for manufacturing the locking ring for a pipe joint according to the second embodiment is obtained by separating the position 17 of the joint 16 between the metal plate and the locking ring 1 and the locking ring 1. The point provided on one side of the outer end support part 3 is different, and this has the advantage that the number of punches for punching the sheet metal can be made half as long as the joint part has on both sides.

(Embodiment 3)

It demonstrates centering around difference with the said embodiment.

In the method of manufacturing the locking ring for a pipe joint according to the third embodiment, as shown in FIG. 5, the locking portion at the inner end side that digs into the tube the dividing position 17 of the metal plate, the locking ring 1, and the joint 16. The point set on the outer circumferential side of (6) is different, and therefore, there is an advantage that the performance does not be affected even if there are some errors in the parting position of the joint.

Example

(1) About the pipe joint provided with the lock ring by the manufacturing method of Embodiment 1 (refer FIG. 1-3), and the pipe joint provided with the lock ring by the conventional manufacturing method (refer FIG. 9 and FIG. 14). The durability test was done as follows.

As shown in FIG. 6, the pipe joint for outer diameter 12mm was attached to the both ends of the tube of outer diameter 12mm and inner diameter 9mm, and it was arrange | positioned by U-shape. The length of the tube was 360 mm, the mounting pitch A was 156 mm, the double amplitude D was 60 mm, and both the vibration cycle and the pressurization cycle were set to 60 cpm. Then, double amplitude (60 mm amplitude) and repeated pressurization (pressure 0 압력 1.25 MPa) were simultaneously performed 5 million times in a cycle of 60 cpm (n = 10).

Then, the pipe joint of Embodiment 1 was satisfactory at the time when 5 million times passed with respect to n = 10, and it was excellent in durability. On the other hand, the conventional joints were opened at the lock ring at 390,000 times, 390,000 times, 450,000 times, 450,000 times, 720,000 times, 780,000 times, 1140,000 times, 2.87 million times, 3.11 million times, and 3.11 million times for n = 10.

That is, the pipe joint provided with the locking ring by the manufacturing method of Embodiment 1 improved the durability significantly compared with the pipe joint provided with the locking ring by the conventional manufacturing method. In addition, the pipe joint provided with the lock ring by the manufacturing method of Embodiment 2, 3 also improved durability compared with the pipe joint provided with the lock ring by the conventional manufacturing method similarly.

(2) About the joint (with reference to FIGS. 1-3) provided with the locking ring by the manufacturing method of Embodiment 1, and the joint (with reference to FIGS. 9 and 14) provided with the locking ring by a conventional manufacturing method. The data of the force which enlarges the diameter of the lock ring at the time of pin gauge insertion was measured. When the value of the force which enlarges the said diameter is small, it can be evaluated that detachment of a tube is easy.

As a test method, the load (N) in the case of inserting the pingauge of the size of 11.90-12.30mm into the lock ring of the pipe size of outer diameter 12mm was measured with the measuring apparatus (load cell). The pin gauge is based on JMAS 4009 (Japan Precision Measurement Institute Standard), the material is steel, the hardness is HRC 58 or more, the surface roughness is Ry 0.8. In addition, the insertion speed was 150-200 mm / s.

Then, when the pin gauge diameter is 11.90 mm, the force which enlarges the diameter of the lock ring by the manufacturing method of Embodiment 1 was 8.5 N, whereas the force which enlarges the diameter of the lock ring by the conventional manufacturing method is It was 9.4 N larger than this. When the pin gauge diameter was 11.95 mm, the force for expanding the diameter of the lock ring by the manufacturing method of Embodiment 1 was 9.2 N, whereas the force for expanding the diameter of the lock ring by the conventional manufacturing method was 10.7, which is larger than this. It was N When the pingauge diameter was 12.00 mm, the force for expanding the diameter of the lock ring by the manufacturing method of Embodiment 1 was 11.2 N, whereas the force for expanding the diameter of the lock ring by the conventional manufacturing method was 13.4, which is larger than this. It was N When the pin gauge diameter was 12.05 mm, the force for expanding the diameter of the lock ring by the manufacturing method of Embodiment 1 was 11.6 N, whereas the force for expanding the diameter of the lock ring by the conventional manufacturing method was 14.6, which is larger than this. It was N When the pin gauge diameter was 12.10 mm, the force for expanding the diameter of the lock ring by the manufacturing method of Embodiment 1 was 12.5 N, whereas the force for expanding the diameter of the lock ring by the conventional manufacturing method was 17.1 which is larger than this. It was N When the pin gauge diameter was 12.15 mm, the force for expanding the diameter of the lock ring by the manufacturing method of Embodiment 1 was 14.5 N, whereas the force for expanding the diameter of the lock ring by the conventional manufacturing method was considerably larger than this. 19.2 N. When the pin gauge diameter was 12.20 mm, the force for expanding the diameter of the lock ring by the manufacturing method of Embodiment 1 was 16.7 N, whereas the force for expanding the diameter of the lock ring by the conventional manufacturing method was considerably larger than this. 25 N. When the pingauge diameter was 12.25 mm, the force for expanding the diameter of the lock ring by the manufacturing method of Embodiment 1 was 17.9 N, whereas the force for expanding the diameter of the lock ring by the conventional manufacturing method was more unusual than this. It was 31.5 N big. When the pin gauge diameter was 12.30 mm, the force for expanding the diameter of the lock ring by the manufacturing method of Embodiment 1 was 20.9 N, whereas the force for expanding the diameter of the lock ring by the conventional manufacturing method was extremely larger than this. 39.7 N.

These results are shown in the graph of "locking friction force (force which enlarges diameter) with respect to pingauge diameter" of FIG. Here, the lock ring by the manufacturing method of Embodiment 1 is a fine and small processus | protrusion part in an outer edge support part, and is shown by "(circle)" in a graph. On the other hand, the lock ring according to the conventional manufacturing method is a fine and small projection on the outer end support portion, and is represented by "Δ" in the graph.

As can be clearly seen from the graph, the locking ring according to the manufacturing method of Embodiment 1 has a smaller force for expanding the diameter than the locking ring according to the conventional manufacturing method. Desorption does not require as much force as before.

Industrial availability

The insertion of the tube does not require as much force as conventionally, and it is possible to greatly improve the durability of the lock ring, so that the tube can be suitably applied to the use of the method for producing a lock ring for a joint.

The present invention has the configuration as described above, and has the following effects.

When using a pipe joint, when the inner diameter of the locking ring is expanded to the outer diameter of the tube when the tube is inserted, the fine and small protrusions are smaller than the maximum outer diameter portion of the outer end support of the locking ring. , It does not generate any contact or interference with the joint built-in member and does not increase the force to enlarge the diameter when the locking ring is rotated inward. It is possible to provide a method for manufacturing a locking ring for a pipe joint that does not require as much force as in the prior art. In addition, it is possible to provide a method for producing a locking ring for a pipe joint with improved durability.

Claims (6)

In the manufacturing method of the lock ring in which the outer end supporting portion is in contact with the receiving portion in the pipe joint, and the engaging portion at the inner end side is inserted into and fixed to the inserted tube.  A punching process for punching a metal plate to form a contour of the locking ring, a bending process for performing three-dimensional bending of the punched metal plate, and a splitting process for separating a joint portion between the metal plate and the locking ring part, And the minute unit value of the joint portion between the metal plate and the lock ring portion is set at a position smaller in diameter than the maximum outer diameter portion of the outer end support portion of the lock ring portion. The method of claim 1, The minute unit value of the joint portion between the metal plate and the lock ring portion is set on the outer circumferential side of the radial arm portion connecting the outer end support portion. The method of claim 1, And the minute unit value of the joint portion between the metal plate and the lock ring portion is set on the outer circumferential side of the engaging portion on the inner end side which is inserted into the tube. In the pipe joint provided with the lock ring which the outer end support part contact | abuts in the accommodating part in a pipe joint, and the locking part which penetrates and fixes the locking part of the inner end side to the inserted tube, The contour of the locking ring is formed by a punching process of punching a metal plate, a bending process of performing a three-dimensional bending process of the punched metal plate, and a dividing process of separating a joint part of the metal plate and the locking ring part, The minute unit value of the joint portion between the metal plate and the lock ring portion is set at a position smaller in diameter than the maximum outer diameter portion of the outer end support portion of the lock ring portion, so that the minute and small portions generated when the joint portion between the metal plate and the lock ring portion are separated. A pipe joint provided with a lock ring, wherein the projection is formed at a diameter smaller than the maximum outer diameter portion of the outer end support portion. The method of claim 4, wherein The minute unit value of the joint portion between the metal plate and the lock ring portion is set on the outer circumferential side of the radial arm portion that connects the outer end support portion of the lock ring portion, so that the minute portion generated when the joint portion between the metal plate and the lock ring portion is divided. A pipe joint provided with a lock ring, characterized in that a small projection is formed on the outer circumferential side of the radial arm portion connecting the outer end support portion. The method of claim 4, wherein The minute unit value of the joint portion between the metal plate and the lock ring portion is set at the outer circumferential side of the engaging portion of the inner end side which is inserted into the tube, so that minute and small projections generated when the joint portion between the metal plate and the lock ring portion are separated are formed on the tube. A pipe joint provided with a lock ring, characterized in that formed in the outer circumferential side of the engaging portion of the inner end side.

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