JP2784072B2 - Round caulking method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a technique for round-tightening a thin-walled cylinder, and in particular, is suitable for round-tightening a protective outer cylinder of an oxygen sensor for an automobile. About technology.

[Prior Art] Normally, as shown in FIG.
Is a hexagonal shape.

[Problems to be Solved by the Invention] As described above, when the caulking portion 901 has a hexagonal shape, a wrench is erroneously hooked on the caulking portion 901 at the time of attachment to an automobile, and the oxygen sensor 900 is damaged. The problem described above occurs.

Based on the view that such a problem would be solved if the round caulking is possible, the present inventors set the caulking pressure using the semi-circular two-part molds 902 and 903 as shown in FIG. One-ton opposing round caulking (one time) was attempted. However, as shown in FIG. 13, burrs 904 were generated at the mold joining portion, and the heat shock characteristics were poor.

An object of the present invention is to provide a round caulking method in which a crimped cylindrical body does not cause a shape defect and has excellent heat shock characteristics.

[Means for Explaining the Problem] In order to achieve the above object, the present invention employs the following constitution.

(1) The caulked cylindrical body and the caulked portion having a cross section of 1 / n (n is a natural number of 2 or more) are faced, and are arranged on the same plane perpendicular to the axis of the caulked cylindrical body. N molds
A method of performing round caulking by relatively displacing each center of an equal circle of the caulking portion so as to be simultaneously located at the center of the caulked cylindrical body, wherein the caulked cylindrical body is moved along the axis line at each caulking. It is rotated around by a predetermined angle relative to the surroundings, and is caulked with a caulking pressure larger than the previous caulking.

(2) One-sided tapered ring having a conical inner surface that becomes smaller in diameter toward the tip, a one-sided holder having a reference surface orthogonal to the axis and having the one-sided tapered ring elastically mounted, and a tip having a cross section of a quadrant at the tip A pair of one-sided dies each having a substantially frustoconical vertical shape with a caulked portion formed therein, arranged such that an outer surface of the cone is fixed to the inner surface of the cone, and a rear end surface is in contact with the reference surface and separated by a shaft. The one-sided member consisting of, and the other-side tapered ring having a conical inner surface that becomes larger in diameter toward the tip, has a substantially truncated conical vertical shape in which a cross-section is formed at the tip with a crimped section, and the conical inner surface has The one-side mold is relatively displaced toward the center of the crimped cylinder with a pair of other-side molds arranged to abut the cone outer surface and to be separated by the shaft. And the other side of the mold to make round butting This is a method of performing temporary crimping first, then rotating the cylinder to be crimped 90 degrees around the axis, and then performing final crimping with a crimping pressure approximately twice that of the temporary crimping. I do.

[Function and Effect of the Invention] <Regarding Claim 1> The caulked portion is rounded. For this reason, when mounting the crimped cylindrical body, it is possible to prevent an error such that the crimping portion is broken by a mounting tool such as a wrench.

In addition, the crimped cylindrical body is relatively rotated around the axis by a predetermined angle each time it is crimped, and the crimping is performed with a crimping pressure larger than the previous crimping, so that the mechanical strength can be improved.

 In addition, 2-8 are suitable for n.

<Regarding Claim 2> (Action) Each member is displaced axially toward the center of the caulked cylindrical body.

The one-side tapering is pushed backward by the contact of the one-side member, and the one-side mold slides on the reference surface and abuts at the axial position. The other mold is pressed by the one mold and slides backward on the inner surface of the cone to abut at the axial position.

Round caulking is performed by the respective molds simultaneously approaching the center of the caulked cylindrical body.

Round shape comes out by temporary caulking. After the completion of the temporary caulking, the caulked cylindrical body is rotated by 90 ° relative to the actual caulking to improve the thermal shock resistance.

Here, if the final caulking is performed from the beginning, the shape is likely to be defective. Further, if the relative rotation angle of the caulked cylindrical body and the caulking pressure of the main caulking deviate from the above-mentioned specifications, it is impossible to improve the heat shock resistance.

(Effects) a. Since the respective dies are simultaneously shifted toward the center of the crimped cylinder, the crimped cylinder can be crimped into an accurate round shape.

I. Since the final caulking is performed after the completion of the temporary caulking, the heat shock resistance is excellent.

C. Since it is divided into one side member and the other side member, even if the crimped cylindrical body has a large diameter portion or the like, it is possible to perform round crimping.

Next, a first embodiment of the present invention will be described with reference to FIGS.

As shown in FIG. 2, the round caulking machine K employing the configuration of the present invention is located below the uncompressed oxygen sensor C,
It comprises a lower member A fixed to 0, an upper member B located above, and a holding mechanism D for an unswaged oxygen sensor C.

The lower member A includes a lower taper ring 1, a lower holder 2, and lower dies 3, 4, as also shown in FIG.

The lower taper ring 1 has a conical inner surface 11 whose diameter decreases upward.

The lower holder 2 has a horizontal reference surface 21 perpendicular to the axis 20 and has the lower tapered ring 1 elastically mounted by a spring 22.

As shown in FIG. 3 (but abutted), the lower molds 3 and 4 have a generally frustoconical vertically split shape in which crimping portions 31 and 41 each having a quarter circle in cross section are formed at the upper end. . Also, molds 3 and 4
The outer conical surfaces 32, 42 are fixed to the inner conical surface 11 by springs 33, 43. Further, the rear end surfaces 34 and 44 are arranged so as to contact the reference surface 21 and be separated by the shaft 20.

As shown in FIG. 1, the upper member B comprises an upper taper ring 5, a pair of upper dies 6, 7, and when caulking, the hydraulic press ram 81 is pushed out and the holder 82 is pressed. Move downward toward the center of the oxygen sensor C.

The upper tapering 5 has a conical inner surface 51 whose diameter increases downward.

Upper dies 6 and 7 are crimped portions 6 with a quarter circle cross section at the lower end.
1 and 71, the truncated cone-shaped vertical split shape is formed, and the conical inner surfaces 51 are brought into contact with the conical outer surfaces 62 and 72 to form springs 63 and 73.
Are arranged so as to separate at the position of the shaft 20.

FIGS. 4 and 5 show a perspective view of the unswaged oxygen sensor C and a one-side cross-sectional view of the swaged oxygen sensor E.

In FIG. 4, 910 and 911 are the parts to be caulked,
912 is a lead wire, and 913 is a coupler part.

In FIG. 5, 914 is a stainless steel tube, 916 is a resin containing glass fiber, 917 is silicon rubber, 918 is packing,
919 is a silicone rubber, 920 is an upper round caulked portion, 921 is a lower round caulked portion, 922 is a metal shell, and 915 is a protective outer cylinder.

The holding mechanism D includes a work holder 201, a protective outer cylinder holder 202, and a work holder cylinder 203.

Next, the operation procedure and effect of the round caulking machine K will be described.

(Work Procedure) The work procedure will be described with reference to FIG.

The upper member B is moved downward on the shaft 20 toward the center of the caulking portions 910 and 911 (either one; the same applies hereinafter) of the oxygen sensor C.

The lower taper ring 1 is pushed downward by the upper taper ring 5, and the lower dies 3, 4
And abut at axis 20.

The upper dies 6 and 7 are pressed by the lower dies 3 and 4 to slide upward on the inner surface 51 of the cone and abut at the position of the shaft 20.

The round caulking is performed by the molds 3, 4, 6 and 7 simultaneously coming close to the center of the portions to be caulked 910 and 911.

A total of two rounds of temporary caulking and final caulking are performed for one part to be caulked. First, temporary crimping is performed with a pressing force of 0.5 ton to obtain a round shape. Next, the oxygen sensor C is rotated by 90 degrees, and the pressing is performed with a pressing force of 1 ton to perform the final tightening.

(Effects) a) Since the dies 3, 4, 6 and 7 are simultaneously moved toward the center of the portions 910 and 911 to be caulked of the non-caulked oxygen sensor C, the portions to be caulked 910 and 911 have an accurate round shape. Can be caulked.

B) After the completion of the 0.5 ton temporary caulking, the 1 ton full caulking is performed, so that a heating shock characteristic of 30 minutes or more can be obtained with the JISB8031 standard heating tester (amplitude: 9 mm). C) Since the lower member A and the upper member B are separated from each other, a problem that the coupler portion 913 does not enter does not occur.

Next, a second embodiment of the present invention will be described with reference to FIGS. 6 to 10 (see also FIGS. 4 and 5).

FIG. 6 shows the entire round caulking machine L employing the configuration of the present invention, 710 is a 16-section turntable capable of simultaneously performing work and operation in each process, 722 is an area sensor, 496, 497, and 4
98 and 499 are lower temporary crimping press, lower main crimping press,
The upper temporary caulking press, the upper caulking press, 500 is a rotating device for rotating the uncompressed oxygen sensor C by 90 degrees clockwise, and 600 and 690 are the turntables for the oxygen sensor E that has completed caulking, respectively.
An extraction unit and a discharge chute for discharging outside the 710.

7 to 10 show the work set section, respectively.
300, a crimping press unit 400, a rotating unit 500, and an unloading unit 600 are shown.

<Description of Work Set Unit 300> In FIG. 7, 310 is a metal shell holder, C is an unswaged oxygen sensor, 330 is a protective outer cylinder support, 340 is a guide shaft,
350 is a slide bearing and 360 is a spring.

The setting direction of the uncured oxygen sensor C is determined by turning the sensor C upside down and wrapping the metal shell 922 with the lead wire 912 down, and setting the guide shaft 340.
The protection outer cylinder support 330 set on the work piece is pushed up by a spring to determine the total length of the workpiece 60 mm.

A space is provided under the protective outer cylinder support 330 so that the coupler 913 is not damaged even if the lead wire 912 of the sensor C moves downward.

<Description of the caulking press unit 400> In FIG. 8, reference numeral 401 denotes an outer taper ring, 402 denotes an outer holder, 403 and 404 denote an outer mold, 405 denotes an inner taper ring, and 406 and 407 denote an inner metal. Type, 420 is axis, 421 is reference plane, 481
Is an inner caulking press, 482 is an inner holder, and 483 is an outer caulking press.

In this embodiment, since the sensor C is set and transported in the vertical direction, the caulking presses 481 and 483 are of a horizontal facing type.

The caulking is performed by first moving the molds 406 and 407 of the press 481 to support the sensor C, and then moving the outer caulking press 483 out. At this time, the caulking portions 910 and 911 of the sensor C are set.
And the center of the mold abutment are considered to match.

In this embodiment, the work set part 300 on the turntable 710 is pressed with indexing accuracy PCD φ1000 ± 0.2 by pressing 481, 483.
The center can be easily adjusted by making fine adjustments in the vertical and horizontal directions. Also press 481,483 from holder
The molds 406, 407, 403, and 404 can be removed together with 482 and 402, and external setup is possible.

 The operation of the caulking press unit 400 will be described.

(A) The turntable 710 rotates and the unswaged oxygen sensor C is transported.

(B) The press 483 moves forward and holds the work position.

(C) The holder 482 hits the taper ring 401, the taper ring 401 moves in the direction of the press 483, and the molds 403, 404 slide on the reference surface 421 of the holder 402, and move toward the centers of the portions 910, 911 to be caulked. Fit. At the same time, the tips of the molds 403 and 404
The dies 406 and 407 hit the 406 and 407, and move toward the center of the portions 910 and 911 to be swaged while moving inside the tapered ring 405 toward the press 408.

<Description of Rotating Unit 500> In FIG. 9, 510 is a 90-degree rotating cylinder, 520 is a slide cylinder, 530 is a parallel chuck cylinder, 540 is a chuck pawl, and 550 is a protector.

The rotary cylinder 510, the parallel chuck cylinder 530, and the chuck pawl 540 are kept on standby outside the turntable 710, and after the turntable indexing is completed, the rotary cylinder 510 and the parallel chuck cylinder 530 are moved toward the center of the unswaged oxygen sensor C. , Close the chuck jaws 540, and
Grab 50, rotate sensor C 90 degrees with cylinder 510,
After completion, the chuck 540 is opened to escape to the outside of the turntable 710.

According to such an operation principle, the sensor C can be rotated by 90 degrees while it is in the work set section 300.

<Description of Extraction Unit 600> In FIG. 10, reference numeral 610 denotes a lowering tool, and 620 denotes a lowering cylinder.

The function of the take-out unit 600 is to chuck the metal shell 922 of the sensor C contained in the work set unit 300 and discharge it onto the outer discharge chute 690 after the turntable 710 is completely indexed.

 Next, the operation procedure of the round caulking machine L will be described.

(1) The worker 720 inserts the unswaged oxygen sensor C into the metal shell holder 310 while pushing down the protective outer cylinder support 330 with the hand 721.

(2) The round caulking portion 911 is caulked with a temporary caulking press 496 at a temporary caulking pressure of 0.5 ton.

(3) The sensor C is rotated 90 degrees by the rotating device 500 (the left side in the figure).

(4) Furthermore, the round caulking portion 911 is attached to the lower caulking press 497.
At the final tightening pressure of 1 ton.

(5) The round caulking portion 910 is caulked with a temporary caulking press 498 at a temporary caulking pressure of 0.5 ton.

(6) The sensor C is rotated 90 degrees by the rotating device 500 (the right side in the figure).

(7) Furthermore, the round caulking portion 910 is attached to the temporary caulking press 499.
At the final tightening pressure of 1 ton.

(8) Pull down the protective outer cylinder support 330 and set the metal shell holder 3
The metal shell 922 in 10 is chucked and discharged to the discharge chute 690.

The round caulking machine L has the following effects in addition to the effects described for the round caulking machine K (first embodiment).

(A) Of the above work procedures, (2) to (8) can be performed automatically, so that it takes 3.9 hours to manufacture 1000 oxygen sensors E (17 hours for the round caulking machine K).

(I) Since the crimped product does not come out of the turntable 710, product management becomes easy.

(C) Poor crimping due to a work error of the worker 720 does not occur.

[Brief description of the drawings]

FIG. 1 is an enlarged view of a main part of a round caulking machine according to a first embodiment of the present invention, FIG. 2 is an overall view of the caulking machine, and FIG. It is explanatory drawing which shows a thing. FIG. 4 is an explanatory view of an unswaged oxygen sensor, and FIG. 5 is an explanatory view of a main part of the swaged oxygen sensor. FIG. 6 is an overall view of a round crimping machine according to a second embodiment of the present invention, and FIGS. 7 to 10 are explanatory views of a work setting section, a crimping press section, a rotating section, and an unloading section, respectively, of the apparatus. It is. FIG. 11 is an explanatory view of a conventional oxygen sensor having a hexagonal caulked portion. FIG. 12 is an explanatory diagram showing opposing round caulking by a half-circle two-piece mold, and FIG. 13 is an explanatory diagram showing a defect of this caulking. In the drawing, 1... Lower tapering (one-side tapering), 2... Lower holder (one-side holder), 3, 4
... lower mold (one-side mold), 5 ... upper taper ring (other-side taper ring), 6, 7 ... upper mold (other-side mold), 11, 51 ... conical inner surface, 20, 420 ... axis, 21,421
…… Reference plane, 31, 41, 61, 71 …… Crimping part, 32, 42, 62,
72: Conical outer surface, 34, 44: Rear end surface, 401: External tapering (one-side tapering), 402: External holder (one-side holder), 403, 404: External mold ( One side mold), 405 ... Inner tapering (other side tapering), 406, 407 ... Inner mold (other side mold), 482 ...
Inner holder (other side holder), A: lower member (one side member), B: upper member (other side member), C: unswaged oxygen sensor (swaged cylindrical body)

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B21D 39/04

Claims (2)

(57) [Claims] 1. A crimped cylindrical body and a crimped portion having a 1 / n cross section (n is a natural number of 2 or more) equidistant circle face each other, and are positioned on the same plane orthogonal to an axis of the crimped cylindrical body. A method of performing round caulking by displacing n molds arranged so that respective centers of equal circles of the caulking portion are simultaneously located at the center of a cylindrical body to be caulked; A round caulking method, comprising rotating the caulked cylindrical body relative to the axis line by a predetermined angle for each tightening and caulking with a caulking pressure greater than the previous caulking. 2. A one-side taper ring having a conical inner surface whose diameter decreases toward the tip, a one-side holder having a reference surface perpendicular to the axis and having the one-side taper ring elastically mounted, and a cross section at the tip at a quarter. A pair of one sides each of which has a substantially frustoconical vertical split shape having a circular caulked portion and is arranged so that an outer surface of the cone is fixed to the inner surface of the cone, and a rear end surface abuts on the reference surface and is separated by an axis. One side member made of a mold, the other side tapered ring having a conical inner surface that becomes larger in diameter toward the tip, and a substantially frustoconical vertically split shape with a crimped section with a quadrant at the tip. The other side member composed of a pair of other side molds arranged so that the outer surface of the cone abuts on the inner surface and is separated by the shaft is relatively displaced toward the center of the cylindrical body to be crimped. Perform each butting of the mold and the other mold This is a method of round caulking, in which temporary caulking is performed first, and then the cylinder to be caulked is rotated relative to the axis by 90 degrees around the axis. A round caulking method characterized in that the main caulking is performed by using.