JP2012035293A - Caulking apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a caulking apparatus capable of caulking a small-diameter pipe by swelling and deforming the pipe from inside toward outside.SOLUTION: The caulking apparatus 10 is provided with a split-die bulge 12. The bulge 12 is made nearly cylindrical by assembling four split-dies 12a, which are identical in shape. On each of split-dies 12a, a groove 12a4 is formed which constitutes an annular groove of the bulge 12, in the side of a caulking claw 12a3, and where a groove 12a5 is formed at the entering side of a shaft 14. An O-ring 12a6 and an O-ring 12a7 are, as annular elastic members, mounted in the groove 12a4 and the groove 12a5 respectively in such a state that the bulge 12 is formed by assembling each of the split-dies 12a. Thereby an excessive load on the bulge 12 (namely, split-dies 12a) that is partially generated in caulking is reduced, so that a pipe P is joined to a flange F by swelling and deforming (radially expanding) the pipe P.

Description

  The present invention relates to a technique for joining pipe bodies, and more particularly to a caulking apparatus that joins a pipe body and another member by caulking.

  2. Description of the Related Art Conventionally, for example, a pipe connecting method described in Patent Document 1 is known. In this conventional method of connecting tubular bodies, the tubular body is inserted into the insertion portion formed in the adapter for joining the tubular bodies, and a force is applied from the inside of the adapter so that the end portion of the tubular body is moved outward together with the adapter. It is designed to bulge and deform. For the bulging deformation, the split mold bulge is inserted inside the adapter, and the distance between the split molds constituting the split mold bulge is expanded, so that the end of the tubular body is bulged and deformed together with the adapter. It is to be caulked.

JP 2000-170964 A

  By the way, in the caulking process accompanied by the bulging deformation as in the conventional method for connecting the tubular bodies, at least the mechanical strength of the split bulge is required to bulge and deform (expand) the tubular body. For this reason, when the tubular body is bulged and deformed (expanded) using a split bulge, the inner diameter of the tubular body is generally 12 mm, for example, from the viewpoint of securing the mechanical strength of the split bulge. The split-type bulge is inserted into the inner side of the large-diameter pipe body exceeding the diameter and caulked.

  On the other hand, when a split bulge is inserted into a thin tube having an inner diameter of 12 mm or less and is joined to a flange by caulking, for example, an interval ((( In other words, the spread of each split mold) is uneven and partly excessive load is easily applied, and the above-mentioned mechanical strength of the split mold bulge is also added, so that the caulking process cannot be performed. When connecting a small-diameter tube having an inner diameter of 12 mm or less and a flange, generally, after inserting the tube into an insertion hole formed in the flange, hitting the vicinity of the insertion hole of the flange, A method of soaking and caulking the flange flesh (so-called dent caulking method) is widely used.In this case, since the dent remains on the flange, it is also necessary to connect the small-diameter pipe and the flange. Swell using the above-mentioned split bulge that does not leave any marks The caulking process by deformation is eagerly desired.

  The present invention has been made to address the above-described problems, and an object of the present invention is to provide a caulking apparatus capable of caulking and deforming a small-diameter tube body from the inside toward the outside. There is to do.

  In order to achieve the above object, the present invention is characterized in that the first member, the second member, and the first member made of a tubular body are inserted into an insertion hole provided in the second member. In the caulking processing apparatus for caulking and joining each other, a cylindrical split bulge made of a plurality of split molds of the same shape divided in the circumferential direction, and entering the inside of the first member A convex portion that contacts the inner surface of the first member is formed on the outer peripheral surface of the step portion, and a plurality of annular grooves are formed on the outer peripheral surface of the second step portion having a larger diameter than the first step portion. A split bulge formed at a distance, and a tapered surface that is formed on the inner peripheral surface side of the split bulge and matches a tapered surface that narrows from the second step portion toward the first step portion. And entering from the second step portion side of the split bulge toward the first step portion side, A shaft that presses each split mold forming the mold bulge in the diameter-enlarging direction, and annular elastic members that are respectively attached to the plurality of annular grooves formed in the second step portion of the split mold bulge. That is.

  In this case, the plurality of annular grooves formed in the second step portion of the split bulge includes at least a side of the second step portion to which the first step portion is connected, and the second step portion. It is good to form in the side in which the said shaft in a step part enters.

  In these cases, the inner diameter of the first member made of the tubular body is preferably about 4.9 mm to about 12 mm, for example.

  According to these, the caulking processing device according to the present invention bulges and deforms the first member made of a thin tube having an inner diameter of about 4.9 mm to about 12 mm, for example, using the split bulge. (Expanding) can be combined. Thereby, for example, when connecting a small-diameter tube body and a flange, it is possible to connect without leaving a dent in the flange, regardless of the dent staking that has been widely practiced conventionally.

  Further, according to the caulking apparatus according to the present invention, it is possible to form the annular grooves spaced apart from each other in the split bulge, and to attach the elastic member to the annular grooves. Thereby, each split mold which comprises a split mold bulge can be spread uniformly with the approach of a shaft. For this reason, the excessive load which generate | occur | produces partially with respect to the split type | mold bulge (more specifically, split type) at the time of a crimping process can be reduced. As a result, it is possible to satisfactorily reduce the occurrence of breakage of the split bulge and the caulking process failure, and it is possible to greatly reduce the maintenance cost and manufacturing cost of the equipment and improve the processing quality.

  Further, according to the caulking apparatus according to the present invention, the outer peripheral surface of the first member (specifically, the small-diameter tube portion) made of the small-diameter tube is used as the second member (for example, the flange). Can be caulked and deformed (expanded) almost evenly with respect to the inner peripheral surface of the insertion hole formed in. Thus, for example, in the case where the final finishing process (for example, brazing process or the like) is performed by caulking, the first member (thin diameter pipe) is formed. The gap between the outer peripheral surface of the body part) and the inner peripheral surface of the insertion hole of the second member (flange) can be made extremely small. For this reason, for example, when brazing is performed as finishing, the surroundings of the molten brazing material can be improved, and the brazing quality can be improved.

  Furthermore, according to the caulking apparatus according to the present invention, it is only necessary to advance and retract the shaft (more specifically, the formed tapered surface) with caulking. For this reason, the configuration of the apparatus can be simplified, and the apparatus itself can be made extremely compact.

It is the schematic which shows roughly the principal part of the crimping processing apparatus of this invention. (A)-(c) is a figure for demonstrating the structure of the split-type bulge of FIG. It is a figure for demonstrating the action | operation of the crimping processing apparatus of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 schematically shows a main part of a caulking apparatus 10 according to the present embodiment.

  The caulking device 10 has a first member made of a small-diameter tube P having an inner diameter of about 4.9 mm to about 12 mm and a flange F as a second member directed from the inside of the tube P to the outside. This is a device for coupling (temporary coupling) to each other by caulking into an insertion hole F1 formed in the flange F by bulging and deforming (expanding). For this reason, as shown in FIG. 1, the caulking apparatus 10 includes a table 11 on which the work W in which the tubular body P is inserted into the stepped insertion hole F1 formed in advance in the flange F is placed. . Further, the caulking device 10 includes a split bulge 12 that bulges and deforms (expands) the pipe body P. As shown in detail in FIGS. 2A and 2B, the split mold bulge 12 is composed of, for example, a plurality (four in this embodiment) of split molds 12a formed of cemented carbide or the like. Is.

  Each split mold 12a enters the pipe P and has a caulking portion 12a1 that forms the first step portion in the split die bulge 12, and has a larger diameter than the first step portion (caulking portion 12a1). The split bulge 12 has a general portion 12a2 that forms a second step portion. And the crimping nail | claw 12a3 which forms the convex part in the split-type bulge 12 in the front end side is formed in the crimping process part 12a1. On the other hand, in the general portion 12a2, a groove 12a4 for forming an annular groove in the split bulge 12 is formed on the caulking portion 12a1 side, and on the side away from the groove 12a4, that is, on the side into which the shaft 14 described later enters. A groove 12a5 is formed.

  In the grooves 12a4 and 12a5 formed in this way, as shown in FIG. 2B, the split molds 12a are assembled to form the split mold bulge 12, and an O-ring as an annular elastic member is formed. 12a6 and O-ring 12a7 are mounted respectively. The O-rings 12a6 and the O-rings 12a7 are elastic with respect to the split molds 12a so that the split molds 12a constituting the split mold bulge 12 are uniformly spaced from each other in the diameter increasing direction at the time of caulking, which will be described later. It gives power.

  Further, as shown in FIG. 2C, an inner tapered surface 12a8 is formed on the inner surface of each split mold 12a. The inner tapered surface 12a8 is a tapered surface that narrows from the groove 12a5 toward the caulking claw 12a3, that is, from the second step portion to the first step portion in the split bulge 12. Thereby, when the shaft 14 which will be described later enters the split mold bulge 12, each split mold 12a can be expanded toward the outside (in the diameter expansion direction).

  As shown in FIG. 1, the split bulge 12 configured in this manner is provided in the second step portion, more specifically, in the general portion 12a2 between the groove 12a4 and the groove 12a5 formed in each split mold 12a. And supported by the holder plate 13. Thereby, in the split mold bulge 12, the first step portion (that is, the caulking portion 12a1 of each assembled split mold 12a) is inserted through the through-hole 11a formed in the table 11, and the workpiece W of the table 11 is passed through. It is supported in a state of protruding from the placement surface to be placed. It should be noted that the holder plate 13 does not interfere with the operation of the split mold bulge 12 described later, that is, the outward spread of each split mold 12a. The general portion 12a2) and a predetermined clearance are secured.

  Further, as shown in FIG. 1, the caulking device 10 is provided so as to be able to advance and retreat with respect to the inner tapered surface 12 a 8 formed on each split mold 12 a of the split mold bulge 12, and enters the split mold bulge 12. Thus, a shaft 14 is provided that presses each split mold 12a toward the outside (in the diameter expansion direction). The shaft 14 includes a tapered surface 14a that matches the inner tapered surface 12a8 formed in each split mold 12a. Here, the tapered surface 14a of the shaft 14 is formed of, for example, a cemented carbide. The shaft 14 is supported by a guide plate 15 and advances and retreats in the axial direction by a driving device 16 that generates a driving force by hydraulic pressure or electric power.

  Next, the operation of the caulking apparatus 10 configured as described above will be specifically described with reference to FIGS. 1 and 3. An operator sets the workpiece W on the mounting surface of the table 11 and activates the crimping apparatus 10. At this time, as shown in FIG. 1, the operator has a first step portion of the split bulge 12 protruding from the table 11 with respect to the insertion hole F1 of the flange F in the workpiece W (that is, each assembled split mold). Insert and set the crimped portion 12a1) of 12a.

  In the caulking device 10, as shown in FIG. 3, the shaft 14 advances toward the split bulge 12 by the driving force of the driving device 16. In the split bulge 12, since the inner tapered surface 12a8 formed in each split mold 12a and the tapered surface 14a of the shaft 14 are aligned, the shaft 14 (tapered surface 14a) is advanced, The interval between the split molds 12a spreads outward (in the direction of diameter expansion), and the split molds 12a inserted into the pipe body P of the workpiece W are displaced toward the inner surface of the pipe body P.

  Meanwhile, the split bulge 12 is formed with a groove 12a4 and a groove 12a5 so as to be separated from each other, and an O-ring 12a6 and an O-ring 12a7 are attached to the grooves 12a4 and 12a5, respectively. For this reason, when each split mold 12a is displaced toward the inner surface of the pipe body P of the workpiece W, it is displaced substantially parallel to the axial direction of the split bulge 12 by the elastic force of the O-ring 12a6 and the O-ring 12a7. To come. Further, in particular, by attaching the O-ring 12a6 to the groove 12a4 formed at a position close to the caulking portion 12a1 (that is, the first step portion in the split bulge 12), the workpiece W in each caulking portion 12a1 is mounted. The displacement toward the inner surface of the tube body P can be made uniform.

  Therefore, when the tapered surface 14a of the shaft 14 advances and the caulking claw 12a3 formed on the caulking portion 12a1 of each split mold 12a contacts the inner surface of the tube P, each caulking claw 12a3 is evenly distributed on the inner surface of the tube P. Will come into contact. When the tapered surface 14a of the shaft 14 further advances in order to bulge and deform (expand) the tube body P toward the inner peripheral surface of the insertion hole F1 of the flange F, the tube body P is evenly contacted with the inner surface of the tube body P. Each caulking claw 12a3 is further displaced toward the inner surface of the tube body P by the tapered surface 14a of the shaft 14, and presses the inner surface of the tube body P so that the outer surface of the tube body P faces the inner peripheral surface of the insertion hole F1. Swells and deforms (expands). In this case, since each split mold 12a and the tapered surface 14a of the shaft 14 are both made of a material having a hardness higher than that of the tube P, the tube P is driven by the driving force of the drive device 16. Easily bulging and deforming (expanding).

  Thereby, the pipe body P is caulked with respect to the inner peripheral surface of the insertion hole F1 of the flange F, and the temporary coupling of the pipe body P and the flange F is completed. As described above, when the temporary coupling is completed, in the caulking processing device 10, the driving device 16 generates a driving force in a direction in which the shaft 14 is retracted to retract the shaft 14. As the shaft 14 moves backward, the split mold bulge 12 gathers the split molds 12a by the elastic force of the O-ring 12a6 and the O-ring 12a7. Can do. In addition, regarding the workpiece W temporarily joined in this manner, the pipe P and the flange F are then airtightly and firmly joined as a final product, for example, by brazing, as a final product. Completed.

  As can be understood from the above description, according to the present embodiment, the caulking device 10 bulges the tubular body P using the split bulge 12 in the connection between the thin tubular body P and the flange F. Deformed (expanded) can be combined. Thereby, it can couple | bond, without leaving a dent in the flange F irrespective of the dent staking which was implemented widely conventionally.

  Further, according to the caulking device 10, the split bulge 12 can be provided with O-rings 12a6 and 12a7 as elastic members separated from each other. Thereby, since each split mold 12a which comprises the split mold bulge 12 can be expanded uniformly with the approach of the shaft 14, it is used as the split mold bulge 12 (more specifically, split mold 12a) at the time of caulking. On the other hand, an excessive load partially generated can be reduced. As a result, it is possible to satisfactorily reduce the occurrence of breakage of the split bulge 12 and the caulking process failure, greatly reduce the maintenance and manufacturing costs of the equipment and the manufacturing cost, and improve the processing quality. .

  Further, according to the caulking device 10, the outer peripheral surface of the pipe body P can be swelled and deformed (expanded) substantially uniformly with respect to the inner peripheral surface of the insertion hole F1 of the flange F. Accordingly, for example, as described above, when the brazing process is finally performed, the gap between the outer peripheral surface of the tube body P and the inner peripheral surface of the insertion hole F1 of the flange F can be made extremely small. Therefore, the periphery of the molten brazing material can be improved, and the brazing quality can be improved.

  Furthermore, according to the caulking processing device 10, it is only necessary to advance and reverse the shaft 14 (more specifically, the tapered surface 14a) with caulking. For this reason, the structure of the crimping apparatus 10 can be simplified and the apparatus itself can be made extremely compact.

  In carrying out the present invention, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the object of the present invention.

  For example, in the above-described embodiment, the case where the linear tubular body P is coupled to the flange F has been described as an example. In this case, since the crimping apparatus 10 can be bulged and deformed (expanded) from the inner side to the outer side of the pipe P, for example, even if the pipe P is bent, it is linear. Caulking can be performed without changing the tube body P.

  Moreover, in the said embodiment, it implemented using O-ring 12a6, 12a7 as an elastic member with which the split-type bulge 12 is mounted | worn. In this case, as long as each split mold 12a constituting the split mold bulge 12 can be displaced uniformly, it can be used as an elastic member, and for example, a metal spring or the like can be used. It is. In the above embodiment, the split bulge 12 is mounted with the O-rings 12a6, 12a7. In this case, the number of elastic members (O-rings) to be mounted is not limited to this, and it goes without saying that three or more elastic members can be mounted on the split bulge.

  Furthermore, in the said embodiment, the split type bulge 12 was comprised and comprised from the four split type | molds 12a. However, the number of split molds constituting the split mold bulge is not limited to this, and it goes without saying that the split mold bulge can be configured from two or more split molds.

  DESCRIPTION OF SYMBOLS 10 ... Caulking apparatus, 11 ... Table, 12 ... Split type bulge, 12a ... Split type, 12a1 ... Caulking process part (1st step part), 12a2 ... General part (2nd step part), 12a3 ... Caulking claw (Convex part), 12a4 ... groove (annular groove), 12a5 ... groove (annular groove), 12a6 ... O-ring (elastic member), 12a7 ... O-ring (elastic member), 12a8 ... inner tapered surface, 13 ... holder plate, DESCRIPTION OF SYMBOLS 14 ... Shaft, 14a ... Tapered surface, 15 ... Guide plate, 16 ... Drive apparatus, P ... Tube (1st member), F ... Flange (2nd member), F1 ... Insertion hole

Claims (3)

In the caulking processing apparatus for caulking and coupling the first member and the second member to each other in a state where the first member formed of a tubular body is inserted into the insertion hole provided in the second member,
A cylindrical split bulge composed of a plurality of split molds having the same shape divided in the circumferential direction, and the first member on the outer peripheral surface of a first step portion entering the inside of the first member A split bulge formed with a plurality of annular grooves spaced apart from each other on the outer peripheral surface of the second step portion having a diameter larger than that of the first step portion.
A tapered surface formed on an inner peripheral surface side of the split bulge and matching a tapered surface narrowing from the second step portion toward the first step portion; A shaft for approaching the first step portion side from the two step portion sides and pressing each split die forming the split die bulge in the diameter increasing direction;
A caulking processing device comprising: an annular elastic member mounted in each of the plurality of annular grooves formed in the second step portion of the split bulge. In the caulking apparatus according to claim 1,
The plurality of annular grooves formed in the second step portion of the split bulge is at least:
The caulking device is formed on a side of the second step portion to which the first step portion is connected and on a side of the second step portion on which the shaft enters. In the caulking processing device according to claim 1 or 2,
The caulking apparatus is characterized in that an inner diameter of the first member made of the tubular body is approximately 4.9 mm to approximately 12 mm.

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