JPH03230828A - Roundly calking method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a technique for circularly tightening a thin-walled cylinder.
In particular, the present invention relates to a tightening technique suitable for round tightening of a protective outer cylinder of an automobile oxygen sensor.

[Prior Art] Normally, as shown in FIG. 11, a caulking portion 901 of an oxygen sensor 900 has a hexagonal shape.

[Problem to be Solved by the Invention] As described above, if the crimping part 901 has a hexagonal shape, a wrench may be accidentally applied to the crimping part 901 when it is installed in an automobile, resulting in damage to the oxygen sensor 900. This problem occurs.

The inventors of the present invention believe that if round caulking is possible, this problem will be solved, and therefore, the caulking pressure is increased by using semicircular two-piece molds 902 and 903 as shown in FIG. 12. Attempted to swage 1 ton of opposing circles (once). However, as shown in FIG. 13, burrs 904 were generated in the mold mating area, and the heat shock properties were also poor, so it was not put into practical use.

An object of the present invention is to provide a round crimping method that does not cause defective shape of a cylindrical body to be crimped and also has excellent thermal shock characteristics.

[Means to solve the problem] In order to achieve the above object, the present invention employs the following configuration.

(1) The cylindrical body to be crimped and the crimped part with a cross section equally divided into circles of 1/n (n is a natural number of 2 or more) face each other, and are arranged on the same plane perpendicular to the axis of the cylindrical body to be crimped. n molds,
This is a method in which circular swaging is performed by relatively displacing the centers of equally divided circles of the swaging portion so that they are simultaneously located at the center of the cylindrical body to be swaged, and each swaging is performed by moving the cylindrical body to be swaged along the axis line. While relatively rotating it by a predetermined angle, it is crimped with a greater crimping pressure than the previous crimping.

(2) One side taper ring with a conical inner surface that becomes smaller in diameter toward the tip, one side holder with a reference direction perpendicular to the axis and elastically loaded with the above-mentioned right side taper ring, and the tip with a quadrant cross section. A pair of one side molds each having a substantially vertically divided truncated conical shape with a caulked portion formed thereon, and arranged such that the outer surface of the cone is fixed to the inner surface of the cone, the rear end surface is in contact with the reference surface, and the molds are separated by an axis. one side member, the other side tapered ring, which has a conical inner surface that becomes larger in diameter toward the tip, and has an approximately truncated conical vertically split shape with a crimped part with a quarter-circle cross section at the tip, and a conical inner surface. The other side member consisting of a pair of other side molds arranged so that their conical outer surfaces abut and are separated by an axis is relatively displaced toward the center of the cylindrical body to be swaged, and the one side mold This is a method in which circular swaging is performed by performing each abutment of the mold on the other side, and the cylindrical body to be swaged is rotated 90 degrees relative to the axis. , the final tightening is performed with a tightening pressure approximately twice that of the temporary tightening.

[Actions and Effects of the Invention] <Regarding Claim 1> The caulked area becomes rounded. For this reason, when mounting a cylindrical body that has been crimped, it is possible to prevent the mistake of placing a mounting tool such as a wrench on the crimped location and damaging the cylindrical body.

In addition, the cylindrical body to be crimped is relatively rotated by a predetermined angle around the axis each time it is crimped, and the crimping is crimped with a larger crimping pressure than the previous crimping, thereby improving mechanical strength.

Note that n is preferably 2 to 8.

Regarding Claim 2> (Operation) Each member is relatively displaced on the axis toward the center of the cylindrical body to be swaged.

The tapered ring on one side is pushed backward by the contact of the member on the one side, and the die on the one side slides on the reference surface and abuts at the axial position.

The other side mold is pressed by the one side mold and slides backward on the conical inner surface, and abuts at the axial position.

Round caulking is performed by simultaneously bringing each mold together toward the center of the cylindrical body to be caulked.

A round shape is created by temporary tightening. After the preliminary tightening is completed, the cylindrical body to be tightened is relatively rotated by 90 degrees and main tightening is performed to improve the thermal impact resistance.

Here, if the main caulking is performed from the beginning, the shape is likely to be defective.

Further, if the relative rotation angle of the cylindrical body to be crimped or the crimping pressure of the main crimping exceed the above-mentioned specifications, the thermal impact resistance cannot be improved.

(Effects) A. Since each mold simultaneously approaches the center of the cylindrical body to be crimped, the cylindrical body to be crimped can be crimped into an accurate round shape.

B. Since the final tightening is performed after the temporary tightening is completed, it has excellent thermal shock resistance.

-Since it is divided into the right side member and the other side member, round swaging can be performed even if the cylindrical body to be swaged has a large diameter portion.

[Example] Next, a first example of the present invention will be described based on FIGS. 1 to 5.

As shown in FIG. 2, the round caulking machine employing the configuration of the present invention includes a base 20 located below the uncashed oxygen sensor C,
It consists of a lower member A fixed at 0, an upper member B located above, and a holding mechanism for the unsealed oxygen sensor C.

As shown in FIG. 1 (enlarged view of main parts), the lower member A is
It consists of a lower taper ring 1, a lower holder 2, and a lower mold 3.4.

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

The lower holder 2 is perpendicular to the axis 20 and has a horizontal reference plane 21.
and a spring 22 that connects the lower tapered ring 1 with a spring 22.
It is loaded with ammunition.

The lower mold 3.4 has a substantially vertically divided truncated conical shape with a crimped part 31.41 having a quarter circular cross section formed at the upper end, as shown in FIG. . Also, mold 3.4
The spring 33 connects the conical outer surface 32.42 to the conical inner surface 11.
．． It is fixed with 43. Furthermore, the rear end surface 34.
44 is placed in contact with the reference surface 21 and separated by the shaft 20.

The upper member B, as shown in FIG. , moves downward toward the center of the oxygen sensor C.

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

The upper mold 6.7 has a caulking part 61 with a cross section of a quarter circle at the lower end.
．． It has a substantially vertically divided shape of a truncated cone 71, and the conical outer surfaces 62 and 72 are in contact with the conical inner surface 51, and the spring 6
3.73, they are arranged so as to be separated at the axis 20 position.

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

In FIG. 4, reference numerals 910 and 911 are parts to be roundly crimped, 912 is a lead wire, and 913 is a part of a coupler.

In Fig. 5, 914 is a stainless steel tube, 916
917 is a glass fiber-containing resin, 917 is a silicone rubber, 918 is a packing, 919 is a silicone rubber, 920 is an upper caulking part, 921 is a lower caulking part, 922 is a metal shell, and 915 is a protective outer cylinder.

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

Next, the working procedure and effects of the round caulking machine will be explained.

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

Upper member B is to be crimped to oxygen sensor C at 910 and 911
(either one; the same applies hereafter) towards the center of axis 2.
0 Move the top down.

The lower taper ring 1 is pushed downwards by the upper taper ring 5, and the lower mold 3.4 has a conical inner surface 11 and a reference surface 2.
1 and collide at the axis 20 position.

The upper mold 6.7 is pressed by the lower mold 3.4 and slides upward on the conical inner surface 51, and abuts at the shaft 20 position.

Round crimping is performed by simultaneously bringing the molds 3.4 and 6.7 toward the center of the portions 910 and 911 to be crimped.

For each area scheduled for tightening, complete tightening is performed twice: temporary tightening and final tightening. First, temporary caulking is performed with a press force of 15 tons to create a round shape. Next, the oxygen sensor C is rotated 90 degrees and a pressing force of 1 ton is applied to perform main caulking.

(Effect) 0 A) Since the molds 3.4 and 6.7 are brought together in the center direction of the portion 910.911 to be crimped of the unstamped oxygen sensor C at the same time, the portion 910.911 to be crimped can be shaped into an accurate round shape. It can be tightened.

b) After completing the temporary tightening of 0.5), we are conducting the final tightening of 1 ton.
mm) for 30 minutes or more. (1) Since it is divided into the lower member A and the upper member B, the problem that the coupler part 913 cannot be inserted does not occur.

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

Fig. 6 shows the entire circular crimping machine adopting the configuration of the present invention, and 710 is a 16-inch machine that can perform the work and operation of each process at the same time.
Equally divided turntable, 722 is area sensor, 496
．． 497, 498, and 499 are lower plate tightening braces, respectively.
Sewage caulking press, sewage caulking press, civil engineering caulking press, 5
00 is a rotation device for rotating the unswaged oxygen sensor C by 90 degrees to the right, and 600 and 690 are a take-out part and a discharge chute for discharging the swaged oxygen sensor E out of the turntable 710, respectively.

Further, FIGS. 7 to 10 respectively show a workpiece setting section 300, a crimping brace section 400, a rotating section 500, and a take-out section 600.

Description of Work Set Unit 300> In FIG. 7, 310 is a metal shell holder C for an uncrimped 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 unsealed oxygen sensor C is determined by turning the sensor C upside down, wrapping the main metal fitting 922 with the lead wire 912 facing downward, and then placing the sensor C in the protective position set on the guide shaft 340. The outer cylinder support 330 is pushed up by a spring to determine the total length of the workpiece of 60 mm.

A space is provided under the protective outer cylinder support 330 to prevent the coupler part 913 from being damaged even if the lead wire 912 of the sensor C is moved in a hanging state.

<Description of crimping brace part 400> In Fig. 8, 401 is an outer taper ring, 402 is an outer holder, 403 and 404 are outer molds, 405 is an inner taper ring, and 406 and 407 are inner molds. Mold, 420 is a shaft, 421 is a reference plane, 481 is an inner tightening brace, 482
483 is an inner holder, and 483 is an outer crimping press.

In this embodiment, since the sensor C is set and conveyed in the vertical direction, the crimping braces 481 and 483 are of a horizontally opposed type.

The crimping is performed by first taking out the molds 406 and 407 of the brace 481 to support the sensor C, and then taking out the outer crimping press 483. At this time, consideration is given so that the center of the caulking portions 910 and 911 of the sensor C coincides with the center of the mold abutment.

In this embodiment, the workpiece set section 300 on the turntable 710 has an indexing accuracy of P, C, D, φ1000±0.2.
This allows for fine adjustment of the brace 481 and 483 up, down, left and right, making centering easier. Also, from the brace 481.483, the holder 482.402 and the mold 406.407.403.
404 is removable, allowing external setup.

The operation of the crimping brace part 400 will be explained.

(a) The turntable 710 rotates and the unsealed oxygen sensor C is transported.

(b) The brace 483 advances to position and hold the workpiece.

(C) Holder 482 hits taper ring 401,
The tapered ring 401 moves in the direction of the press 483, the molds 403 and 404 slide on the reference surface 421 of the holder 402, and come together toward the center of the parts to be crimped 910 and 911.

At the same time, the tips of the molds 403 and 404 are connected to the molds 406 and 406.
07, mold 406.407 is taper ring 40
While moving the inside of 5 toward the press 481 side, tighten the part 9 to be tightened.
10. Get closer to the center of 911.

Description of Rotating Unit 500> In FIG. 9, 510 is a 90 degree rotating cylinder, 4520 is a slide cylinder, 530 is a parallel chuck cylinder, 540 is a chuck claw, and 550 is a protector.

A rotating cylinder 510, a parallel chuck cylinder 530, and a chuck claw 540 are kept on standby outside the turntable 710, and after indexing of the turntable is completed, the rotating cylinder 510 and parallel chuck cylinder 530 are moved toward the center of the uncrimped oxygen sensor C. , close the chuck claws 540, grasp the protector 550, rotate the sensor C by 90 degrees using the cylinder 510, and after completion, open the chuck claws 540 so that the protector 550 escapes to the outside of the turntable 710.

According to such an operating principle, the sensor C can be rotated 90 degrees while remaining in the workpiece setting section 300.

<Description of the extraction part 600> In FIG. 10, 610 is a pull-down tool, and 620 is a pull-down cylinder.

The role of the take-out part 600 is to chuck the metal shell 922 of the sensor C on the turntable 710 and discharge it onto the outer discharge chute 690.

Next, we will explain the working procedure of the round caulking machine.

(1) The worker 720 holds the protective outer cylinder support 330 with his hands 721.
While pressing down, fit and insert the unsealed oxygen sensor C into the metal shell holder 310.

(2) The round crimping scheduled portion 911 is crimped using a lower plate crimping press 496 with a temporary crimping pressure of 0.5 tons.

(3) Rotate sensor C by 90 degrees using rotation device 2500 (left side in the figure).

(4) Further, the round swaging portion 911 is swaged using a sewage swaging press 497 with a swaging pressure of 1 ton.

(5) The round crimping scheduled portion 910 is crimped with a temporary crimping pressure of 0.5 tons using a lower plate crimping press 498.

(6) Rotate the sensor C by 90 degrees using the rotation device 500 (on the right side in the figure).

(7) Furthermore, the round crimping scheduled portion 910 is crimped using a civil engineering crimping press 499 with a crimping pressure of 1 ton.

(8) Pull down the protective outer cylinder support 330, chuck the metal shell 922 in the metal shell holder 310, and discharge it to the discharge chute 690.

In addition to the effects described in the section on the circular caulking machine (first embodiment), the circular caulking machine also has the following effects.

(A) Of the above work steps, (2) to (8) can be performed automatically, so in order to manufacture 1000 oxygen sensors E, 3.
It only takes 9 hours (17 hours for round caulking machines).

(1) Product management is facilitated because the products being crimped do not come out of the turntable 710.

C) Poor tightening due to work errors by the worker 720 does not occur.

[Brief explanation of drawings]

Fig. 1 is an enlarged view of the main parts of a circular crimping machine according to the first embodiment of the present invention, Fig. 2 is an overall view of the crimping machine, and Fig. 3 shows a case where the molds used in the crimping machine collide. It is an explanatory diagram showing a thing. FIG. 4 is an explanatory diagram of an unstamped oxygen sensor, and FIG. 5 is an explanatory diagram of main parts of an oxygen sensor that has been swaged. FIG. 6 is an overall view of a round caulking machine 7 according to a second embodiment of the present invention, and FIGS. 7 to 10 are explanations of the work setting section, caulking press section, rotating section, and take-out section, respectively. It is a diagram. FIG. 11 is an explanatory diagram of a conventional oxygen sensor having a hexagonal caulking portion. FIG. 12 is an explanatory diagram showing opposing round caulking using a semicircular two-part mold, and FIG. 13 is an explanatory diagram showing defects in this caulking. In the diagram 1... Lower taper ring (one side taper ring) 2... Lower holder (-left side holder) 3.4.
...Lower mold (-left side mold) 5...Upper tapered ring (other side taper ring) 6.7...Upper mold (other side mold) 11.51...Conical inner surface 20.42
0...Axis 21.421...Reference plane 31.41.
61.71...Clinching part 32.42.62.72...
- Conical outer surface 34.44... Rear end surface 401... Outer tapered ring (one side tapered ring) 402... Outer holder (-left side holder) 403.404...
Outer mold (-left side mold) 405... Inner tapered ring (other side taper ring) 406, 8 407... Inner die (other side die) 482... Inner holder (other side side holder) A...lower member (-
Right side member) B... Upper member (other side member) C...
Unstamped oxygen sensor (cylindrical body to be swaged)

Claims (1)

[Scope of Claims] 1) A cylindrical body to be crimped and a crimped part having an equally divided circle of 1/n (n is a natural number of 2 or more) in cross section are faced to each other, and the same cylindrical body is perpendicular to the axis of the cylindrical body to be crimped. In this method, round swaging is performed by relatively displacing n molds arranged on a plane so that the centers of the equally divided circles of the swaging portion are simultaneously aligned with the center of the cylindrical body to be swaged. A circular swaging method, characterized in that each swaging, the cylindrical body to be swaged is relatively rotated by a predetermined angle around the axis, and the cylindrical body is swaged with a larger swaging pressure than the previous swaging. 2) One side taper ring having a conical inner surface that becomes smaller in diameter toward the tip, one side holder that has a reference surface perpendicular to the axis and is elastically loaded with the one side taper ring, and a cutting edge with a cross section of a quarter circle at the tip. 1, which has a substantially vertically divided shape of a truncated cone with a tightening portion formed therein, and is arranged such that the outer surface of the cone is fixed to the inner surface of the cone, the rear end surface is in contact with the reference surface, and is separated by an axis;
One side member consists of a pair of one-side molds, the other side taper ring has a conical inner surface that becomes larger in diameter toward the tip, and the tip has an approximately truncated conical vertically split shape with a crimped part with a quadrant cross section. and the other side member consisting of a pair of other side molds arranged so that the outer surface of the cone abuts the inner surface of the cone and are separated by an axis are relatively displaced toward the center of the cylindrical body to be swaged. , a method in which circular swaging is performed by abutting the one side mold and the other side dies, first temporary swaging is performed, and then the cylindrical body to be swaged is rotated 90 degrees around the axis. A round staking method characterized in that after relative rotation, main swaging is performed with a swaging pressure approximately twice that of the temporary swaging.