JP2006102752A - Laminated composite body and method for manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To secure the desired quality of coating by finishing the opening edge part of a depressed part formed by overhang caulking into a gentle shape. <P>SOLUTION: After setting a knuckle bracket 2 in a prescribed position in a forming device by laminating it on a tube 1 comprises a strut for automobiles, the overhang caulking is performed by cooperation of a die 5 arranged inside the tube 1 and a caulking punch 6 arranged outside the knuckle bracket 2. After that, the depressed part 4 where is formed by the overhang caulking is positioned in a prescribed position to a chamfering punch 7 by rotating the joined tube 1 and the knuckle bracket 2 and a gentle roundness so that the quality of later coating is not hindered is performed in the opening edge part 4a by performing chamfering to the opening edge part 4a of the depressed part 4 by the chamfering/forming part 7a of the chamfering punch 7. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  TECHNICAL FIELD The present invention relates to a polymer of a plate or a tube obtained by joining at least two plates or pipes by overhanging and a method for producing the same.

  For example, a suspension strut (hydraulic shock absorber) for an automobile has a spring seat for receiving a spring interposed between the tube (outer tube) and the vehicle body at an axially intermediate portion of the tube (outer tube), and a knuckle of the vehicle body at the lower end of the tube. The knuckle brackets connected to each other are superposed and fixed. Conventionally, welding is generally employed for joining the spring seat and knuckle bracket to the tube. In this case, however, the oxide scale generated by the heat of welding and fine dust scattered in the air during welding are used in the tube. There was a risk of remaining inside and entering the oil as foreign matter (contamination).

Therefore, conventionally, in the device described in Patent Document 1, for example, as shown in FIGS. 5 and 6, the overlapping portion of the tube 1 and the knuckle bracket 2 constituting the strut is spotted and caulked. Both of them are joined and integrated by a plurality of caulking portions 3 by overhang caulking.
Japanese Patent Laid-Open No. 2004-223612

  By the way, in the overhang caulking method described in Patent Document 1, after the die 5 is positioned and fixed to one side (knuckle bracket 2 side) of the overlapping portion of the tube 1 and the knuckle bracket 2 as shown in FIG. The punch 6 is moved in the overhang caulking direction F, and the knuckle bracket 1 and the tube 2 are locally pushed into the molding recess 5a of the die 5 by the small-diameter pushing portion 6a. In this case, the caulking portion 3 is formed with a recessed portion 4 as a trace of the punch 6, and the opening edge 4 a of the recessed portion 4 is substantially formed by plastic flow of the material that follows the pushing of the punch 6. Edge shape. However, this type of strut is finally finished by painting for rust prevention, and when the edge-shaped opening edge 4a exists, the coating of the paint on the opening edge 4a is prevented. There was a risk that this would become the starting point of rusting.

  The present invention has been made in view of the above-described technical background, and the problem is that the opening edge of the recessed portion formed by overhanging is finished into a gentle shape, thereby achieving a desired coating quality. An object of the present invention is to provide a plate or tube polymer that can be secured and a method for producing the same.

  In order to solve the above-mentioned problems, the polymer according to the present invention is characterized in that a gentle slope or roundness is added to the opening edge of the recessed portion formed by overhanging at least two plates or pipes. To do.

  In addition, a method for producing a polymer according to the present invention for solving the above-described problems includes a work setting process in which at least two plate materials or pipe materials are overlapped and set at a predetermined position in a molding apparatus, and the work setting process includes: Thereafter, an overhang caulking step in which overhang caulking is performed by the cooperation of the caulking punch and the die, and after the overhang caulking step, the chamfering punch in the molding apparatus is formed by the overhang caulking. And a chamfering step of chamfering the opening edge of the recessed portion. In this case, the chamfering process may be performed by chamfering the punching chamfer as a chamfering punch after the overhanging caulking process is finished and the joint work is moved and the recessed portion is positioned with respect to the chamfering punch. A functioning punch unit may be provided to continuously execute overhanging.

  According to the polymer of the plate or pipe according to the present invention, since the opening edge of the recessed portion formed by overhanging is gently sloped or rounded, sufficient coating can be applied to the opening edge. A film thickness can be obtained, and a stable rust prevention effect can be obtained.

  In addition, according to the joining method according to the present invention, since overhang caulking and chamfering are performed within the same molding apparatus, the opening edge of the recessed portion formed by overhang caulking is efficiently sloped or rounded. be able to. In addition, when chamfering is performed by moving the joint work and positioning the concave portion with respect to the chamfering punch, the molding pressure can be kept low by using a chamfering punch different from the overhanging punch. This reduces the burden on each punch and extends the tool life. In addition, when the caulking punch is provided with a punch portion that functions as a chamfering punch and is continuously executed by overhang caulking, it is not necessary to move the joined workpiece, so that the cycle time is shortened.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.
1 and 2 show one embodiment of a method for producing a polymer according to the present invention. In this embodiment, the tube polymer (tube material) 1 and the knuckle bracket (tube material) 2 constituting the strut shown in FIGS. 5 and 6 are joined by overhang caulking to obtain a tube polymer. A pair of dies 5 and punches 6 (same as those shown in FIG. 7) used for the overhang caulking are disposed in the molding apparatus. In the present embodiment, a pair of chamfering punches 7 each having a chamfered molding portion 7a are disposed in the same overhanging apparatus. The pair of chamfering punches 7 are axially opposed to each other around the overlapping portion of the tube 1 and the knuckle bracket 2 in the same manner as the pair of punches 6 (hereinafter referred to as caulking punches) 6. The position is shifted from the caulking punch 6 by a predetermined angle in the rotation direction. Each of the pair of caulking punches 6 and the pair of chamfering punches 7 is moved forward and backward in a direction of approaching and separating from each other by a driving unit (not shown).

  The pair of dies 5 is supported by a hollow mandrel 10 that can be inserted into the tube 1 so as to be movable back and forth in the radial direction. The support structure of this die 5 is the same as that shown in the aforementioned Japanese Patent Application Laid-Open No. 2004-223612, and each die 5 is a guide formed in the tip end portion of the hollow mandrel 10 in the axial radial direction. It is fixed to the front surface of a pair of cradle 12 slidably fitted in the hole 11. A taper rod 13 inserted into the hollow mandrel 10 and linearly moved by a driving means (not shown) is operatively connected to the back surface of each cradle 12 via a wedge engaging portion 14 that engages with a groove. Yes. That is, the pair of cradles 12 advance and retreat in the radial direction with each other according to the linear movement of the taper rod 13, and the pair of dies 5 correspond to the retracted position shown in FIG. Are arbitrarily positioned at the caulking position shown in FIG.

  In carrying out this manufacturing method, first, the tube 1 and the knuckle bracket 2 are fitted together, and both are set at predetermined positions in the molding apparatus, and then the hollow mandrel 10 is inserted into the tube 1. . Next, the taper rod 13 in the hollow mandrel 10 is moved (moved downward). Then, as shown in FIG. 2, the respective cradles 12 move radially outward from each other, and thereby the dies 5 supported by the respective cradles 12 are positioned at the caulking position where they abut against the inner surface of the tube 1. The Thereafter, the pair of caulking punches 6 are moved in a direction approaching each other by driving means (not shown). Then, as shown in FIG. 2, the overlapped portion of the knuckle bracket 2 and the tube 1 is locally pushed into the molding recess 5a of the die 5 by the small-diameter pushing portion 6a of the punch 6, whereby the tube 1 and the knuckle The bracket 2 is overhanged. At this time, since the two locations facing each other in the axial diameter direction are bulged simultaneously, the molding pressure acts efficiently on the overlapped portion, thereby reducing the molding load.

  After the overhanging, the pair of punches 6 are moved backward by the driving means (not shown) and the taper rod 13 is moved upward. Then, the pair of pedestals 12 wedged by the taper rod 13 are retracted, and the pair of dies 5 are retracted to the retracted position shown in FIG. In this embodiment, when the die 5 is retracted to the retracted position, as shown in FIG. 1, the tube 1 and the knuckle bracket 2 (joined workpiece) joined by overhang caulking are rotated in the R direction by a predetermined angle. And after rotation of this joining workpiece | work, a pair of chamfering punch 7 is moved to the direction which mutually approaches. Then, the chamfered molded portion 7a formed on each chamfering punch 7 presses the opening edge portion of the recessed portion 4 of each caulking portion 3, and thereby the opening edge portion of the recessed portion 4 contacts the chamfered molded portion 7a. Chamfered to follow the shape. At this time, since two places facing in the axial direction are chamfered at the same time, the molding pressure acts efficiently on each caulking portion 3, thereby reducing the molding load. Further, since chamfering is performed with a dedicated punch 7 independent of the caulking punch 6, the burden on the punches 6 and 7 is reduced, and the tool life is extended.

  Thereafter, the chamfering punch 7 is retracted, and the joined body is taken out from the molding apparatus. Thus, a series of joining steps is completed, whereby a polymer 15 as shown in FIG. 3 is obtained. In this polymer 15, a considerably large round (R) 4 a is attached to the opening edge of the recessed portion 4 formed in the caulking portion 3 by overhanging caulking. Thus, the large roundness 4a of R is attached to the opening edge portion 4a of the recessed portion 4, so that when the outer surface of the polymer 15 is subsequently coated, the opening edge portion 4a of the recessed portion 4 is also sufficient. The coating is applied (a sufficient coating thickness is obtained), and as a result, a stable rust prevention effect can be obtained also at the opening edge 4a. In addition, the magnitude | size of the roundness attached to the said opening edge part 4a can be made into arbitrary magnitude | sizes in the range in which desired coating-film thickness is obtained, ie, the coating quality is not inhibited. Moreover, this roundness can be replaced with a slope (C surface).

  Here, in the above-described embodiment, only the bonded work after overhanging is rotated so that the recessed portion 4 is positioned with respect to the chamfering punch 7. The workpiece may be rotated. In this case, since the die 5 is backed up, the chamfering punch can be strongly pressed against the opening edge portion 7 of the recessed portion 4, and a larger roundness can be added.

  Further, in the above embodiment, the chamfering is performed by the dedicated punch 7 independent of the caulking punch 6, but the present invention may be used for the chamfering process. . FIG. 4 shows an embodiment in this case, and a chamfered portion 20 that functions as a chamfering punch is provided in the middle of the pushing portion 6 a of the caulking punch 6. In this embodiment, at the final stage of overhang caulking, the chamfered portion 20 acts on the opening edge portion 4a of the recessed portion 4 so that the opening edge portion 4a of the recessed portion 4 follows the chamfered molded portion 7a. Chamfered in shape. In this embodiment, since it is not necessary to rotate the workpiece, the cycle time is shortened compared to the above embodiment.

  In the above embodiment, a chamfering punch is used in order to give a gentle slope or roundness. However, the present invention is not limited to this, and according to the present invention, after caulking with a caulking punch, The corner of the opening edge portion formed by the above may be gently inclined or rounded by, for example, “wet cutting (cutting while applying oil) + cleaning”. In this case, a gentle slope or rounded portion can be formed more precisely, and a more stable coating thickness can be obtained.

It is sectional drawing which shows one embodiment of the manufacturing method of the polymer which concerns on this invention. It is sectional drawing which shows the overhang | caulking caulking process in this manufacturing method. It is sectional drawing which shows the structure of the polymer obtained by this manufacturing method. It is sectional drawing which shows other embodiment of the manufacturing method of the polymer which concerns on this invention. It is a perspective view which shows the superposition | polymerization structure of the tube and knuckle bracket which comprise the strut which is one of the polymers concerning this invention. It is sectional drawing which shows the superposition | polymerization structure of the tube and knuckle bracket which were shown in FIG. It is sectional drawing which shows the conventional overhanging caulking method.

Explanation of symbols

1 Tube (tube material)
2 Knuckle bracket (pipe material)
DESCRIPTION OF SYMBOLS 3 Caulking part 4 Recessed part 4a Opening edge part of recessed part 5 Die 6 Caulking punch 7 Chamfering punch 15 Polymer 20 Punch part

Claims (4)

  A polymer obtained by joining at least two plates or pipes by overhang caulking, wherein the opening edge of the recessed portion formed by overhang caulking has a gentle slope or roundness. Coalescence. It is a manufacturing method of the polymer of Claim 1, Comprising: At least 2 board | plate materials or a pipe material are piled up, the work setting process which sets in the predetermined position in a shaping | molding apparatus, and the crimping punch after this work setting process, An overhang caulking step that performs overhang caulking in cooperation with the die, and an opening edge of the recessed portion formed by the overhang caulking by the chamfering punch in the molding apparatus after the overhang caulking step And a chamfering step for chamfering the polymer. 3. The method for producing a polymer according to claim 2, wherein after the overhang caulking is finished, the joining work is moved to position the recessed portion with respect to the chamfering punch, and chamfering is executed. 3. The method for producing a polymer according to claim 2, wherein the caulking punch is provided with a punch portion functioning as a chamfering punch, and the chamfering is continuously performed after the overhang caulking.

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