KR101311691B1 - Apparatus and method for manufacturing of one body type hollow drive shaft - Google Patents

Abstract

The present invention simplifies the molding apparatus and molding method of the hollow drive shaft to reduce the weight of the drive shaft, improve the natural frequency performance, and reduce the manufacturing cost and improve the productivity of the integral hollow drive shaft molding apparatus and molding The purpose is to provide a method.
The present invention for implementing this, the cylindrical body portion, the shaft tube portion is gradually reduced outwardly from both ends of the body portion, and the extension portion extending outward from the extended end of the shaft tube portion and the spline is formed on the outer peripheral surface integrally In the shaping apparatus of the drive shaft is formed by processing a hollow cylindrical tube formed inside, the swaged groove of the shape corresponding to the body portion and the shaft tube portion and the extension portion is formed in the inward direction from the end opened to one side Swaging die for inserting and pressing both sides of the tube to swag the shape of the drive shaft; A tube guide supporting the tube such that the axis of the tube and the axis of the swaging groove coincide with each other; And pressurizing means for pressing the one end of the tube to provide a pressing force so that the other end of the tube is pressed into the swaging groove.

Description

Forming apparatus and forming method of integrated hollow drive shaft {APPARATUS AND METHOD FOR MANUFACTURING OF ONE BODY TYPE HOLLOW DRIVE SHAFT}

The present invention relates to a molding apparatus and a molding method of an integrated hollow drive shaft, and more particularly, a hollow shaft is formed inside the tube, and both sides of the tube are simplified by simplifying the molding process of the hollow drive shaft in which the shaft tube part and the extension part are integrally formed. The present invention relates to a molding apparatus and a molding method of an integrated hollow drive shaft which can improve fuel efficiency and natural frequency performance according to the weight reduction, and reduce manufacturing cost and increase productivity.

The drive shaft is a power transmission medium that transmits driving force by varying length and angle according to a change of relative position from a transmission to a wheel.

1 is a side view showing a conventional drive shaft assembly for a vehicle, FIG. 2 is a (a) front cross-sectional view and (b) partial side cross-sectional view showing a shaping device and a molding method of a drive shaft to which a conventional rotary swaging method is applied, and FIG. A perspective view of a drive shaft formed by applying a friction welding method.

Referring to FIG. 1, a conventional drive shaft assembly 1 includes a driven shaft shaft 2 connected to a transmission (not shown) side, the slidable driven shaft 2, and a hollow shaft tube 3. It consists of a drive shaft 10 coupled by a slidable propulsion shaft shaft 4 which is coupled as a medium.

The inner circumferential surface of the driven shaft shaft 2 and the propulsion shaft shaft 4 is formed with an arm spline in the longitudinal direction of the drive shaft 10, and the sliding portion 6 at the front and rear ends of the drive shaft 10 has its outer circumferential surface. The male spline is formed in the slide part and is slidably inserted into the inner circumferential surfaces of the driven shaft 2 and the propulsion shaft 4. Therefore, the drive shaft 10 serves to transmit the driving force by changing the length and angle in accordance with the change in the relative position by the power generated from the engine to the wheel.

Conventionally, since the drive shaft 10 is manufactured in a solid type, the weight of the vehicle body becomes heavy and fuel efficiency is low, as well as noise is largely generated due to resonance generated when the drive shaft 10 rotates. . In recent years, in order to suppress the generation of noise due to the weight reduction and the avoidance of resonance design, the drive shaft 10 has a tendency to manufacture a hollow type (hollow type) with an empty inside.

Such a drive shaft 10 is manufactured by plastically processing a hollow hollow tube, hereinafter, a molding apparatus and a molding method of the conventional drive shaft 10 will be described with reference to FIGS. 2 and 3.

Referring to FIG. 2, a conventional rotary swaging device includes a main shaft 20 inserted into an inner side of a hollow tube 10, which is a base material to be formed into a drive shaft, and an outer portion of the tube 10. A plurality of dies 30 arranged on the side surfaces at regular intervals, a hammer 40 in contact with an outer end of the die 30 and arranged to reciprocate in a radial direction, and reciprocating movement of the hammers 40. The roller 60 and the roller 60 disposed at regular intervals along the circumferential direction so as to contact the guide member 50, the head portion 40a of the hamber 40, and the outer end of the guide member 50. It is composed of a retainer 70 for fixing the position of the constant.

In the rotary swaging method using the rotary swaging device, the inner end of the die 30 is rotated by rotating the die 30 together with the main shaft 20 while the main shaft 20 is inserted into the tube 10. Molding is performed while repeatedly hitting the outer surface of the tube (10). That is, when the head 30 of the hammer 40 contacts the roller 60 while the die 30 and the hammer 40 on the outside thereof rotate, the die 30 is driven by the hammer 40. It is pressed in the direction toward the to hit the outer surface of the tube 10, when the head portion (40a) of the hammer 40 is between the rollers 60, the space between the rollers 60, dies by centrifugal force The play between the 30 and the tube 10 is generated, in which case the tube 10 moves in the axial direction, the die 30 is repeatedly operated in the centrifugal direction by the rotation of the main shaft 20, the main shaft By the pressing force between the head portion 20a of the 20 and the die 30, the tube 10 is shaped into the shape of the body portion 10a, the shaft tube portion 10b, and the extension portion 10c.

However, such a conventional rotary swaging device has a disadvantage in terms of manufacturing cost and productivity due to the excessive number of parts, which is complicated in structure, expensive in equipment, and requires excessive process time for forming the drive shaft. .

As another example of the prior art, the hollow drive shaft 10 shown in FIG. 3 is disclosed in Korean Patent Laid-Open Publication No. 10-2005-006343. It is manufactured by a welding step of extending the length of the long shape and joining both ends of the formed two tubes, the shaft tube portion 13 is formed between the extrusion section 11 and the drawing section 12, the drawing of each tube The friction welding part 15 is formed at the tip of the part 12, and has a structure in which a spline 14 is formed around the outer diameters of both ends of the drive shaft 10.

However, when manufacturing the drive shaft by applying the friction welding method as described above, the friction welding process is additionally required for the extrusion and drawing process, and the welding operation by welding requires a skilled technique, so there is a problem that the operation is not easy.

The present invention has been made to solve the above problems, by simplifying the molding apparatus and the molding method of the hollow drive shaft to reduce the weight of the drive shaft and improve the natural frequency performance, while reducing the manufacturing cost and improve productivity It is an object of the present invention to provide a molding apparatus and a molding method of an integral hollow drive shaft.

The molding apparatus of the integrated hollow drive shaft of the present invention for realizing the object as described above, the cylindrical body portion, the shaft tube portion is gently reduced in diameter outwardly from both ends of the body portion, and from the extended end of the shaft tube portion In the shaping device of the drive shaft is formed by processing the cylindrical tube hollow is formed inside and the extension portion extending outward, the body portion, the shaft tube portion and the swaged groove corresponding to the extension portion opening to one side A swaging die which is formed inwardly from the end thereof and for which both sides of the tube are inserted and pressed to swag the shape of the drive shaft; A tube guide supporting the tube such that the axis of the tube and the axis of the swaging groove coincide with each other; And pressing means for pressing the one end of the tube to provide a pressing force so that the other end of the tube is pressed into the inside of the swaging groove. It is characterized in that the pin is further provided to be inserted into the hollow portion of the part.

One embodiment of the forming method of the integrated hollow drive shaft of the present invention, the cylindrical body portion, the shaft tube portion is gradually reduced outwardly from both ends of the body portion, and the extension extending outward from the extended end of the shaft tube portion Claims [1] A method of shaping a drive shaft formed by processing an integrally formed cylindrical hollow tube, the method comprising: preparing a cylindrical hollow tube; Preparing a swaging die having swaged grooves corresponding to the body portion, the shaft tube portion, and the extension portion; One end of the tube is placed inside the swaging groove of the swaging die while the body of the tube is supported by the tube guide supporting the tube so that the axis of the tube and the axis of the swaging groove coincide with each other. Seating and pressing the other end of the tube to swag the one end of the tube; And withdrawing the tube from the swaging die and seating the other end of the tube inside the swaging groove of the swaging die while supporting the body of the tube by the tube guide. Comprising a step of swaging the other end of the tube by pressing, the step of the swaging, the other end of the swaging groove corresponding to the extension portion in the hollow portion of the extension during the swaging process Characterized in that it is carried out after fixing the pin is inserted into.

Another embodiment of the forming method of the integral hollow drive shaft of the present invention includes a cylindrical body portion, a shaft tube portion whose diameter is gradually reduced outwardly from both ends of the body portion, and an extension extending outward from an extended end of the shaft tube portion. Claims [1] A method of shaping a drive shaft formed by processing an integrally formed cylindrical hollow tube, the method comprising: preparing a cylindrical hollow tube; Preparing a first swaging die and a second swaging die having swaged grooves corresponding to the body portion, the shaft tube portion, and the extension portion; And the first and second sway of the both sides of the tube in a state in which the body part of the tube is supported by the tube guide supporting the tube such that the axis of the tube and the axis of the swaging groove coincide with each other. The step of seating on the inside of the swaging groove of the die die and pressurizing both ends of the tube at the same time comprising the step of swaging, the step of the swaging, the other end of the swaging groove corresponding to the extension portion It is characterized in that it is carried out after fixing the pin is inserted into the hollow portion of the extension during the swaging process.

According to the molding apparatus and molding method of the integral hollow drive shaft according to the present invention, a swaging die formed with a swaging groove corresponding to the shape of the body portion, the shaft tube portion and the extension portion of the drive shaft, and the tube to prevent the shaking of the axis of the tube The hollow cylindrical tube can be formed into an integral hollow drive shaft by a hydroforming method using a molding device of a simple configuration consisting of a pressing device that presses the side end of the tube in the other direction during the guide and swaging process. In addition to improving fuel efficiency and natural frequency performance by reducing the weight of the shaft, it is possible to improve product productivity by reducing manufacturing cost and time while maintaining high strength and processing precision.

1 is a side view showing a drive shaft assembly for a conventional vehicle;
Figure 2 is a (a) forward cross-sectional view and (b) partial side cross-sectional view showing a molding apparatus and a molding method of the drive shaft applying the conventional rotary swaging method,
3 is a perspective view of a drive shaft formed by applying a conventional friction welding method,
4 is a (a) perspective view and (b) a cross-sectional view of an integral hollow drive shaft according to the present invention;
5 to 9 are cross-sectional views showing a forming apparatus and a molding method of an integrated hollow drive shaft according to a first embodiment of the present invention;
10 and 11 are cross-sectional views showing a forming apparatus and a molding method of an integrated hollow drive shaft according to a second embodiment of the present invention;
12 to 16 are cross-sectional views showing a forming apparatus and a molding method of an integrated hollow drive shaft according to a third embodiment of the present invention;
17 and 18 are cross-sectional views showing a forming apparatus and a molding method of an integrated hollow drive shaft according to a fourth embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

4 is a (a) perspective view and (b) A-A section view of the integrated hollow drive shaft according to the present invention;

The integrated hollow drive shaft 100 according to the present invention, as shown in Figure 4 (a) is manufactured by plastic working hollow cylindrical tube, the cylindrical body portion 110 and the body portion ( Shaft tube parts 130 and 150 whose diameters are gradually reduced to the outside from both side ends of the 110, and extending from both ends of the shaft tube parts 130 and 150 to the same diameter to the outside and splines 125 and 145 formed on the outer circumferential surface thereof. The parts 120 and 140 are integrally formed.

In addition, as shown in FIG. 4 (b), the thicknesses of the cross sections of the extension parts 120 and 140 and the shaft pipe parts 130 and 150 are formed to be thicker than the cross-sectional thickness of the body part 110 so that the diameter is smaller than that of the body part 110. Consists of a structure capable of reinforcing the strength of the extension portion 120,140 and the shaft tube portion 130,150 formed.

In the present invention, by applying a hydraulic forming process (Hydraulic Forming Process) the hollow hollow cylindrical tube by the plastic working process the body portion 110, the extension portion 120 and the shaft tube portion 130 integrally formed drive shaft Processed by (100), hereinafter will be described a molding apparatus and a molding method using the integrated hollow drive shaft configured as described above.

< First Embodiment >

5 to 9 are cross-sectional views showing a molding apparatus and a molding method of the integrated hollow drive shaft according to the first embodiment of the present invention.

The molding apparatus of the integrated hollow drive shaft according to the first embodiment of the present invention, the swaging of the shape corresponding to the shape of the body portion 110, the shaft tube portion 130, 150 and the extension portion 120, 140 of the drive shaft 100 The groove 210a is formed inward from one end which is opened to one side, and both sides of the hollow cylindrical tube 100 having a hollow inside, which is the base material of the drive shaft 100, are inserted and pressed to form both sides of the tube 100. The tube 100 so that the swaging die 210 for swaging into the shape of the portion 130, 150 and the extension portion 120, 140 and the axis of the tube 100 and the axis of the swaging groove 210a coincide with each other. Pressing one end of the tube guide 220 and the tube 100 surrounding the outer surface of the body portion 110 of the pressing force so that the other end of the tube 100 is pressed into the inside of the swaging groove 210a. It is configured to include a pressing means for providing. In the present invention, the pressurizing means is composed of a hydraulic cylinder (not shown) and a punch 230 for transmitting the hydraulic pressure of the hydraulic cylinder to the tube 100, but is not limited thereto, and swaging the tube 100. If the means for providing the pressing force in the axial direction for processing may be configured by replacing the power means other than the hydraulic pressure.

The tube guide 220 is composed of an integral cylindrical shape having an inner diameter of a size corresponding to the outer diameter of the body portion 110 of the tube 220, or constant along the circumferential direction to support the outer surface of the body portion 110 It may be composed of divided arrangements at intervals.

In addition, the tube guide 220 is capable of horizontal movement along the longitudinal direction of the tube 100 so that the position for supporting the outer surface of the body portion 110 of the tube 100 is variable corresponding to the length of the tube 100 to be processed. It is preferably configured as, and may be configured to include a lifting means connected to the tube guide 220 to change the vertical position of the tube guide 220.

Hereinafter, a molding method using the molding apparatus of the drive shaft configured as described above will be described. Referring to FIG. 5, a cylindrical tube 100 having a hollow inside is prepared, and one side end (lower portion in the drawing) of the tube 100 passes through the tube guide 220 and swaging the swaging die 210. It is seated inside the groove 210a. At this time, since the tube 100 is fixed in the vertical direction by the tube guide 220, the center axis of the tube 100 and the center axis of the swaging groove 210a are positioned on the same line, Up and down movement of the tube 100 is possible, but the shaking in the horizontal direction is prevented.

After one end of the tube 100 is seated inside the swaging die 210, as shown in FIG. 6, the other end of the tube 100 (upper end portion in the drawing) is connected to a hydraulic cylinder (not shown). One side end of the tube 100 is pressed by the punch 230 for transmitting the hydraulic pressure to the space condensed downward of the swaging groove 210a to extend to one side of the body portion 110 of the tube 100. 120 and the shaft tube part 130 are shape | molded by the swaging process. At this time, the punch 230 is repeatedly pressed up and down until one side of the tube 100 reaches the lower end of the swaging groove 210a by repeatedly performing the up and down movement so that the extension part 120 and the shaft tube part 130 are molded. do.

After the extension part 120 and the shaft tube part 130 are formed on one side of the tube 100 through the above process, the tube 100 is withdrawn from the swaging die 210 as shown in FIG. 7. The other end of the tube 100 passes through the tube guide 220 and is positioned to be seated inside the swaging groove 210a of the swaging die 210.

Thereafter, one side end of the tube 100 having the extension part 120 and the shaft tube part 130 is pressed with the punch 230 and subjected to the same process as described above to obtain the other part of the tube 100 as shown in FIG. 8. An extension part 140 and a shaft tube part 150 are formed at side ends. At this time, the extension portion 120 and the shaft tube portion 130 formed at one end of the tube 110 to which the force of the punch 230 is directly transmitted are thickened in cross section while undergoing a swaging process to have sufficient strength. Therefore, even if the diameter of the extension portion 120 is concentric with the body portion 110, deformation by the pressing force of the punch 230 does not occur.

After the shaft tube portions 130 and 150 are integrally formed on both sides of the body portion 110 of the tube 100 through the above process, the tube 100 from the swaging die 210, the tube guide 220, and the punch 230 is formed. 9, and the splines 125 and 145 are formed on the outer circumferential surfaces of the extension parts 120 and 140 by using the die-for-die die 300 to complete molding of the integrated hollow drive shaft.

As described above, in the present invention, since the molding apparatus having a simple structure including a swaging die 210, a tube guide 220, and a punch 230 for transmitting hydraulic pressure and a molding method using the same, the integral hollow drive shaft may be formed, Compared to the molding apparatus and the molding method to which the rotary swaging method or the friction welding method according to the prior art are applied, there is an advantage that the number of parts and the number of processes of the device can be greatly reduced.

< Second Embodiment >

10 and 11 are cross-sectional views showing a molding apparatus and a molding method of an integrated hollow drive shaft according to a second embodiment of the present invention.

In the first embodiment described above, an embodiment of forming a drive shaft by swaging one side and the other side of the tube 100 in sequence is described, but in the second embodiment of the present invention, both side ends of the tube 100 are described. It consists of swaging simultaneously.

In this configuration, in the molding apparatus according to the present embodiment, the first swaging die 210-1 and the second swaging die 210-2 are formed in a symmetrical shape with a swaging groove 210 a formed therein. ), The first punch 230-1 and the second punch 230-axially pressing both end portions of the tube guide 220 and the tube 100 supporting the body 110 of the tube 100. 2) is configured to include.

In the molding method using the apparatus for forming a drive shaft configured as described above, as shown in FIG. 10, the body 110 of the tube 100 is supported by the tube guide 220 to prevent lateral shaking. In the state, both ends of the tube 100 are seated inside the swaging groove 210a of the first swaging die 210-1 and the second swaging die 210-2, respectively.

Next, as shown in FIG. 11, the body of the tube 100 by a swaging process of simultaneously pressing the first punch 230-1 and the second punch 230-1 in a direction facing each other using hydraulic pressure. Shaft pipe portions 130 and 150 and extension portions 120 and 140 are formed at both sides of the portion 110 at the same time.

Thereafter, as in the above description of FIG. 9, the operation of forming the splines 125 and 145 on the outer circumferential surfaces of the extension parts 120 and 140 is performed.

According to this embodiment, since the spline processing is performed at both sides of the tube 100 at the same time, the number of processes can be reduced compared to the molding method according to the first embodiment, and thus the productivity can be improved by a faster molding operation. Since the punch 230-1 and the second punch 230-2 pressurize the first swaging die 210-1 and the second swaging die 210-2, the force is directly applied to the tube 100. There is an advantage to eliminate the deformable elements of the tube 100, which may occur when delivered.

< Third Embodiment >

12 to 16 are cross-sectional views showing a molding apparatus and a molding method of an integrated hollow drive shaft according to a third embodiment of the present invention.

The third embodiment of the present invention includes all of the configurations of the above-described first embodiment as it is, and the hollow of the extension parts 120 and 140 at the other end of the swaging groove 210a corresponding to the extension parts 120 and 140. The pin 250 is inserted into the inner portion is further characterized in that it is provided.

In the present embodiment, the pin 250 is attached to the magnetic jig 240, the magnetic jig 240 is fixed toward the inside of the swaging groove 210a to be formed with the extension (120, 140) pin 250 Is attached to the swaging die 210 as much as possible. That is, the pin 250 is detachably attached to the magnetic jig 240 by the magnetic force of the magnetic jig 240, and the magnetic jig 240 is detachably attached to the swaging die 240.

Thus, in this embodiment, when the end of the tube 100 is pressed into the inside of the swaging groove 210a during the swaging process, it extends into the space between the outer surface of the pin 250 and the inner surface of the swaging groove 210a. Since the parts 120 and 140 are inserted and molded at a predetermined position, the processing precision of the extensions 120 and 140 may be improved, and as shown in FIG. 16, the splines 125 and 145 may be formed on the outer surfaces of the extensions 120 and 140. Since the pin 250 inserted into the hollow portion inside the extension parts 120 and 140 supports the compressive force by the die processing die 300 during the rolling process, there is an advantage in that the rolling accuracy may also be improved.

The process sequence according to the present embodiment is performed by the same process as the forming method of the first embodiment, except that the pin 250 is fixed to perform the swaging process.

< Fourth Embodiment >

17 and 18 are cross-sectional views showing a forming apparatus and a molding method of an integrated hollow drive shaft according to a fourth embodiment of the present invention.

The fourth embodiment of the present invention includes all the configurations of the above-described second embodiment, the hollow portion of the extension portion 120, 140 during the swaging process on the other end of the swaging groove 210a corresponding to the extension portion 120,140 It is characterized in that it further comprises a pin 250 and the magnetic jig 240 inserted into the inside.

The configuration and operation of the pin 250 and the magnetic jig 240 are the same as those described in the above-described third embodiment, and the configuration in which the swaging process is simultaneously performed on both sides of the tube 100 is described above. The configuration is the same as in the second embodiment.

According to this embodiment, since the swaging process is performed at both sides of the tube 100 at the same time, the extension part 120 and 140 by the configuration of the pin 250 and the magnetic jig 240 with the advantage of shortening the processing time. There is an advantage that can improve both the processing precision and the precision of the rolling process.

100: drive shaft (tube) 110: body
120,140: Extension 125,145: Spline
130,150: shaft portion 210: swaging die
210a: swaging groove 210-1: first swaging die
210-2: second swaging die 220: tube guide
230: Punch 230-1: First Punch
230-2: second punch 240: magnetic jig
250: pin 300: die for rolling

Claims (8)

A cylindrical body portion, a shaft tube portion whose diameter is gradually reduced outwardly from both ends of the body portion, and an extension portion extending outward from the extended end of the shaft tube portion is formed integrally, and is formed by processing a hollow cylindrical tube. In the molding apparatus of the drive shaft,
A sway for forming a swaging groove corresponding to the body portion, the shaft tube portion, and the extension portion is formed in an inward direction from an end opened to one side, and both sides of the tube are inserted and pressed to sway into the shape of the drive shaft. Gong die;
A tube guide supporting the tube such that the axis of the tube and the axis of the swaging groove coincide with each other; And
And pressurizing means for pressing the one end of the tube to provide a pressing force so that the other end of the tube is pressed into the swaging groove.
The other end of the swaging groove corresponding to the extension portion forming apparatus of the hollow hollow shaft, characterized in that the pin is further provided to be inserted into the hollow portion of the extension. The method of claim 1,
Wherein the pressing means comprises:
Molding apparatus of the integral hollow drive shaft, characterized in that consisting of a punch for transmitting the hydraulic pressure of the hydraulic cylinder to the tube. The method of claim 1,
The tube guide is a molding apparatus of the integral hollow drive shaft, characterized in that the horizontal movement along the longitudinal direction of the tube is provided so that the position for supporting the outer surface of the tube in response to the length of the tube is variable. delete The method of claim 1,
And the pin is attached to the magnetic jig, and the magnetic jig is attached to the swaging die such that the pin is fixed toward the inside of the swaging groove to be molded. A cylindrical body portion, a shaft tube portion whose diameter is gradually reduced outwardly from both ends of the body portion, and an extension portion extending outward from the extended end of the shaft tube portion is formed integrally, and is formed by processing a hollow cylindrical tube. In the shaping method of the drive shaft,
Preparing a hollow cylindrical tube;
Preparing a swaging die having swaged grooves corresponding to the body portion, the shaft tube portion, and the extension portion;
One end of the tube is placed inside the swaging groove of the swaging die while the body of the tube is supported by the tube guide supporting the tube so that the axis of the tube and the axis of the swaging groove coincide with each other. Seating and pressing the other end of the tube to swag the one end of the tube; And
Withdraw the tube from the swaging die and seat the other end of the tube inside the swaging groove of the swaging die and press one end of the tube while supporting the body of the tube by the tube guide. To swaging the other end of the tube by including;
The step of swaging, integral hollow, characterized in that the other end of the swaging groove corresponding to the extension portion is fixed after the pin is inserted into the hollow portion of the extension during the swaging process Forming method of drive shaft. A cylindrical body portion, a shaft tube portion whose diameter is gradually reduced outwardly from both ends of the body portion, and an extension portion extending outward from the extended end of the shaft tube portion is formed integrally, and is formed by processing a hollow cylindrical tube. In the shaping method of the drive shaft,
Preparing a hollow cylindrical tube;
Preparing a first swaging die and a second swaging die having swaged grooves corresponding to the body portion, the shaft tube portion, and the extension portion; And
The first swaging die and the second swaging are respectively formed at both ends of the tube while the body of the tube is supported by the tube guide supporting the tube such that the axis of the tube and the axis of the swaging groove coincide with each other. It is seated on the inside of the swaged groove of the die and the step of swaging by simultaneously pressing both ends of the tube;
The step of swaging, integral hollow, characterized in that the other end of the swaging groove corresponding to the extension portion is fixed after the pin is inserted into the hollow portion of the extension during the swaging process Forming method of drive shaft.

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