JPH0253128B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION As shown in FIG. 1, the present invention mainly relates to a plug 9 (referred to as a connector) for connecting one end of a tube body 1 such as a corrugated flexible tube for electrical wiring. In order to prevent the end of the pipe body 1 from coming off when connecting to the straight pipe 14 via The portion 11 can be formed into the end of the tube body 1, or the tube body 1, such as a copper tube through which a fluid such as Freon gas flows, can be connected to a coupler K via a flare nut F, as shown in FIG.
This is a tube end forming device that expands the end of the tube 1 into a conical shape in order to connect it to the tube. A screw shaft that rotates around an axis that is the same as or almost the same as the center of the pipe to be processed, and is attached to the tip of the screw shaft, and by screwing the screw shaft toward the side close to the fixed grip part. a rotating body that is connected to the tip of the screw shaft and rotates together with the screw shaft; A rotary roller that is supported by a rotating body and freely rotates while revolving around the helical axis in contact with the edge of the pipe to be processed as the rotating body rotates. Regarding processing equipment.

A device that has been generally known in the past as a device that processes and forms the end of a tube body while plastically deforming it by pressing it in the tube axis direction is a device that has a pressing part that comes into contact with the entire circumference of the end edge of the tube. There was a device that used axial movement to press the entire circumference of the end of the tube at once and plastically deform it, but this method had the disadvantage of requiring a large pressing operation force during press deformation processing. As shown in FIG. 7, the inventor of the present invention progresses the deformation while locally pressing the edge of the tube 1' with a roller 5' that freely rotates while revolving around the center of the tube 1'. They devised a tube end forming device that can plastically deform the end of the tube 1' with a small pressing operation force. They discovered that the following technical problems occur when plastic deformation is applied to the material.

That is, when the rotary roller 5', which freely rotates while revolving around the center of the tube while locally pressing the edge of the tube 1', stops when the pressure deformation of the tube 1' ends, There is a possibility that a stepped portion d remains at the end of the tube body 1' that the stopped roller 5' was in contact with.
There is a problem in the smoothness accuracy of the pressed surface which becomes the sheet surface when the tubes are connected, and there is a disadvantage that it is not possible to connect the tubes with high airtightness.

In view of the above circumstances, the present invention is a pressing deformation processing method in which a roller moves around the center of the tube to locally press the edge of the tube, but a step is created on the deformed end surface after the end of the forming process. An object of the present invention is to provide a tubular body end forming apparatus that can provide a good finish without any problems.

The characteristic configuration of the present invention, which has been made to achieve the above object, is that in the above-mentioned pipe body end forming apparatus, the helical shaft is rotated when the rotating roller is in contact with the end edge of the pipe body to be processed. An elastic body is provided that is elastically deformed as it spirals toward the side close to the fixed gripping part, and the rotating roller is pressed against the end of the to-be-processed tube by the elastic return force of the elastic body. The point is that it is configured to undergo plastic deformation.

The effects of the present invention having such a characteristic configuration are as follows.

That is, when the rotating roller is brought into contact with the edge of the tube to be processed and the screw shaft is threaded toward the side close to the fixed grip, the roller will come into contact with the edge of the tube to be processed. However, as long as the elastic restoring force of the elastic body acting on the edge of the tube via the rotating roller does not have enough pressing force to plastically deform the edge of the tube, the screw will not rotate. Despite the shaft spiraling toward the fixed gripping section, the rotating roller only moves toward the fixed gripping section by an amount corresponding to the amount of elastic deformation of the end edge of the tube, but hardly moves, and the screw of the screw shaft does not move. Only the elastic body is elastically deformed while absorbing the amount of force.

Then, as the screw shaft spirals, the elastic body is elastically deformed to a sufficiently large extent, and when an elastic return force sufficient to plastically deform the end edge of the tube acts, the rotating roller moves toward the fixed grip part. While moving, the edge of the tube is plastically deformed.

Therefore, as the screw shaft spirals, the rotating roller causes the end edge of the tube to be plastically deformed by an amount that balances the elastic return force of the elastic body, and at the same time, the edge of the tube is The elastic body is deformed so as to compensate for the accompanying decrease in the amount of elastic deformation of the elastic body, and the rotary roller rotates while continuously plastically deforming the edge of the tube due to the spiral advance of the screw shaft.

Next, the amount of plastic deformation of the edge of the tube is difficult to further plastically deform due to the return force of the elastic body that was previously acting on the edge of the tube via the rotating roller. When this amount is reached, the rotating roller rotates while pressing the end edge of the tube without moving almost toward the fixed gripping portion, and only the elastic body is further elastically deformed.

Therefore, when the amount of plastic deformation at the edge of the tube reaches a certain level, the rotating roller is sufficient to plastically deform the stepped portion of the pressed surface of the tube; Since it rotates with a pressing force that is insufficient to cause further plastic deformation around the entire circumference, the end edge of the tube is plastically deformed almost uniformly over the entire circumference, unlike conventional As a result, there is almost no step formed on the pressed surface by the rotating roller, and the surface can be processed almost flat, thereby improving the smoothness accuracy of the processed surface.

Next, embodiments of the present invention will be described based on the drawings.

As shown in FIG. 1, in order to prevent the flexible tube 1a from coming off at the connection between the flexible tube 1a for electrolytic acid ray, which is an example of the tube body 1, and the hard tube 14, a connecting plug 9 is inserted. A flexible tube crushing device, which is an example of a tube end forming device for forming a tube crushing portion 11 that enters and is locked in a groove 10 formed on the inner surface, is constructed as shown in FIG. To,
A swinging member 17 is attached to the lower part of an encircling frame 16 with a handle 15 for the worker to grasp with his/her hand, and the swinging member 17 is attached to the opposite side of the lower side member 18 of the frame 16 and the swinging member 17. Flexible tube 1a
Recesses 19, 19 for insertion are formed, and the recess 1
A pair of left and right guide grooves 24 formed on the inner surface of the frame 16 constitute a fixed grip part 2 that clamps and clamps the flexible tube 1a by operating a tightening screw 20 when inserted between the frames 16 and 19. ，
A member 30 fitted to 24 so as to be able to slide up and down
Then, the screw shaft 12 inserted through the hole 33 in the upper part of the frame 16 is screwed together so as to rotate around the same axis _P2 as the center of the flexible tube 1a,
An elastic body 31 is provided between the member 30 and the frame 16.
A spring 31a, which is an example, is provided, and the screw shaft 1 is
A rotating body 4 is integrally connected to the tip of the screw shaft 1.
A ratchet mechanism 22 is formed at the upper end of the rotor 2, and by repeatedly rocking the ratchet trench 23 fitted into the ratchet mechanism 22, the screw shaft 12 rotates and the rotating body 4 is rotated. As shown in FIG. 5... is configured to be brought into pressure contact and sequentially crushed. Reference numeral 25 in the figure is a sliding member that fits into the guide grooves 24, 24 and slides up and down together with the rotating body 4, and this sliding member 25 is brought into contact with a stopper S formed in the lower part of the frame 16. The pressing section 3 composed of the rotating body 4 and the rollers 5 is pressed against the frame 16.
It is designed so that it will not come off.

Then, when the screw shaft 12 is rotated with the rollers 5 in contact with the edge of the flexible tube 1a which is clamped and clamped by the fixed grip part 2, the rollers 5...
While rotating, the member 30 slides away from the fixed grip part 2, and when the screw shaft 12 is further rotated with the member 30 in contact with the spring 31a, the spring 31a is elastically deformed, When the elastic return force of the spring 31a becomes large enough to plastically deform the edge of the flexible tube 1a, the rotating rollers 5 plastically deform the edge.

Then, when the entire protruding edge of the flexible tube 1a from the fixed gripping part 2 is crushed and the movement of the pressing part 3 toward the fixed gripping part 2 is restricted, the rotation of the screw shaft 12 causes the spring to be released. 31a is further elastically deformed, the roller 5 moves the fixed grip part 2
The flexible tube 1a rotates without moving much to the side, and the pressed surface of the flexible tube 1a is plastically deformed almost uniformly.

Further, in order to elastically deform the elastic body 31 as the screw shaft 12 rotates, the screw shaft 1 is inserted into the screw hole 21 formed in the upper part of the frame 16, as shown in FIG.
2 are screwed together, and a rubber 3, which is an example of an elastic body 31, is inserted into a hole H formed in the longitudinal direction of the screw shaft 12.
1b and the rotating body 4 is inserted, and in this state, the pin 26 is passed through the long hole 34 formed in the rotating body 4 and extends over the screw shaft 12 and the rotating body 4. The movement of the pressing part 3 toward the fixed grip part 2 by rotating the rubber 31
It may be configured so that only the rotation of the pressing part 3 is allowed by absorbing the contraction deformation of b.

In addition, as shown in FIG.
When expanding the end of the tubular body 1 into a conical shape in order to connect it to the coupler K via the rotary body 4, as shown in FIG. In addition to forming a conical shape, the free axis P ₁ of the roller 5 is set to the rotation axis P ₂ of the rotating body 4.
It is constructed so that it is slightly inclined relative to the pipe body, and the end portion of the pipe body can be pressed and deformed into a conical shape by the rollers 5. Further, the rotating body 4 having the rollers 5 for crushing the flexible tube and the rotating body 4 having the rollers 5 for expanding the end of the tube may be configured to be interchangeable as attachments.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of the drawing]

The drawings show an embodiment of the tube end forming apparatus according to the present invention, in which FIG. 1 is a cross-sectional view showing a connecting portion of a crush-molded tube, and FIG. 2 is a partially cutaway side view showing the entire body. , FIG. 3 is a sectional view taken along the - line in FIG. 2, and FIG. 4 is a partially cutaway side view showing another embodiment.
FIG. 5 is a cross-sectional view showing a connection part of an expanded tube body, FIG. 6 is a partially cutaway side view showing another embodiment,
FIG. 7 is a partially cutaway side view showing a comparative example. 1... Tube body, 2... Fixed grip part, P ₂ ... Shaft core,
3... Pressing part, 4... Rotating body, 5... Roller, 1
2... Spiral shaft, 31... Elastic body.

Claims (1)

[Claims] 1. A fixed grip part 2 for the tube to be processed 1, and a screw shaft 12 that rotates around an axis P2 that is the same or almost the same as the center of the tube to be processed 1 gripped by the fixed grip part ₂ . , the screw shaft 1
A pressing part 3 is attached to the tip of the pipe body 2 and presses the end part of the tube to be processed 1 to plastically deform it by screwing the screw shaft 12 toward the side close to the fixed grip part 2. , the pressing part 3 is connected to the tip of the screw shaft 12 and rotates integrally with the screw shaft 12, and is supported by the rotor 4 and presses the workpiece as the rotor 4 rotates. A tubular body end forming apparatus is comprised of a rotating roller 5 that freely rotates while revolving around the axis of a screw shaft 12 while in contact with the edge of the tubular body 1, the rotating roller 5 being in contact with the edge of the tubular body 1. An elastic body 31 is provided which is elastically deformed as the screw shaft 12 spirals toward the fixed grip portion 2 while in contact with the end edge of the tubular body 1 to be processed, and the elastic body 31 A tubular body end forming apparatus characterized in that the rotary roller 5 is pressed against the end of the to-be-processed tubular body 1 and plastically deformed by an elastic return force of 31. 2 The rotating roller 5 is located at the axis of the screw shaft 12.
The tubular body end forming apparatus according to claim 1, further comprising a rotating surface that contacts the end edge of the to-be-processed tubular body 1 and plastically deforms it in an attitude perpendicular to _P2 . 3 The rotating roller 5 is located at the axis of the screw shaft 12.
The tube end forming according to claim 1, which is provided with a rotating surface that contacts the end edge of the tube to be processed 1 from the inner surface and plastically deforms it in an attitude inclined with respect to _P2 . Processing equipment. 4. The tubular body end forming apparatus according to claim 1, wherein the elastic body 31 is constituted by a spring.