KR20070080433A - Drawing method of tapered metal tube or conducting post and its device - Google Patents

Abstract

A method and a device for drawing a conical metal pipe or a metal rod having a tapered part are provided to taper the metal pipe or the metal rod in a conical form with little power by using a drawing ball. A method for drawing a conical metal pipe or a metal rod having a tapered part comprises the steps of: fixing one end of an object(20) to a rotary fixing device(21); pushing the other end of the object into a sleeve(22) of a drawing device(23) having a tapered inside and fixing the object by a ball containing holder(232); repeatedly drawing the object in the predetermined length to taper the rotating object by pulling the ball containing holder by a first pulling device(26) with turning the object by the rotary fixing device; and separating the sleeve and the drawing device from the end of the object tapered in a conical form and separating the other end of the object from the rotary fixing device.

Description

Drawing method of tapered metal tube or conducting post and its device

1 is a front view of a steel pipe drawing device having a conventional taper.

Figure 2 (a) (b) is a front and side cross-sectional view of the drawer of the conventional steel pipe drawing apparatus having a taper.

3 is a plan view of the device of the present invention;

4 is a front view of the apparatus of the present invention.

Figure 5 (a) (b) is an enlarged cross-sectional view and side view of the main portion of the sleeve and the drawer of the device of the present invention.

Figure 6 is a side cross-sectional view of another embodiment of a sleeve of the device of the present invention.

7A to 7F are flowcharts for explaining the method of the present invention.

Fig. 8 (a) (b) is a perspective view of a workpiece (conical flag carrier) formed by drawing a conical tapered pulled work and a large diameter, a cone portion, and a small diameter integrally drawn by the present invention.

Explanation of symbols on the main parts of the drawings

20: workpiece 21: rotation fixing device

22: sleeve 23: drawing machine

24, 25: 1st and 2nd table 26, 27: 1st and 2nd traction apparatus

28: control unit 29: guider

30: body 211, 235: motor

212: chuck drive unit 213: chuck

221: ball holder insert hole 231: drawing ball

232: Ball Holder 233: Holder Case

234: hollow 261, 271: screw coupling

262, 272: screw rod 263, 264, 273, 274: idler

265, 275: first and second drive motors 221a: large diameter molded part

221b: Conical portion 221c: Small diameter portion

The present invention relates to a tapered conical metal tube or metal rod drawing method and apparatus therefor, and more particularly, to reprocess an existing steel pipe using a less power into a tapered metal tube or metal rod having different diameters on both sides. By rotating the drawer in the same direction as the workpiece, it can be machined to a very small diameter (e.g. about 3 mm) and has a uniform taper in the longitudinal direction even without highly precise control. It is invented to process.

In general, metal tubes are produced in a unit length by drawing, and they are all manufactured in the same diameter and shape.

However, telephone poles, poles of street lamps, flag poles, golf clubs, naps, folding antennas, traffic lights, etc. need to process the metal tube into a tapered conical metal tube, which is conventionally bent sequentially using a metal sheet for this purpose Tapered conical metal tubes were made.

On the other hand, domestic patent registration No. 458864 has proposed a drawing method and a drawing device of steel pipes having a variety of forms and shapes in a manner to control the pressure jig for drawing the pipe to form a taper on the outer peripheral surface of the steel pipe.

Steel pipe drawing method having such a taper inclination and the draw method of the device, the taper inclination to pull the steel pipe (10a) to draw a constant taper inclination along the longitudinal direction of the outer peripheral surface of the existing steel pipe (10a) In the steel pipe drawing method having a steel pipe fixing step of pushing and fixing by the cylinder 36 so that the tip of the steel pipe (10a) is fitted into the pipe drawer (40), and the pipe drawer (40) A traction device connection step of fixing and connecting the steel pipe 10a fixed to the traction device driving unit 50 and the clamping unit 51 by a transfer unit 52 and a belt unit connected to the belt to pull the steel pipe 10a fixed thereto; Steel pipe drawing which pulls in the longitudinal direction so that the steel pipe can pass through the inside of the pipe drawing machine 10 by using the clamp unit 51 connected to the 52. The guide groove 42a- formed in the pipe drawer 40 has a pressing jig 44 which is in close contact with the outer circumferential surface thereof in accordance with the system and the conveying speed of the steel pipe 10a passing through the pipe drawer 40. The outer peripheral surface of the steel pipe passing through the pipe drawer 40 includes a jig control step of controlling to move radially along 42n).

In addition, the drawing device for performing the above drawing method is a steel pipe drawing device in the steel pipe drawing device having a constant taper in the longitudinal direction, as shown in Figs. 1 and 2 (a) (b). Steel pipe conveying unit 35 is provided with a supply cylinder unit 36 which is located in the back portion of the steel pipe (10a) to push the steel pipe (10a) so that the tip of the steel pipe (10a) is fitted into the inside of the pipe drawer (40), Necessary shape and shape of the outer circumferential surface of the steel pipe which is in intimate contact with the outer circumferential surface of the steel pipe 10a by a plurality of pressing jigs 44a-44n assembled in the radially installed guide grooves 42a-42n. Square, hexagonal, octagonal, circular, etc.) and the pipe drawer 40 formed to form a position facing the pipe drawer 40, the steel pipe 10a to the inside of the pipe drawer 40 Steel pipe 10a to pass through The clamping unit 51 which clamps one end, the transfer unit 52 which pulls out like the steel pipe 10a clamped by the clamp unit 51, and the said transfer unit 52 connect with a belt. The steel pipe feeder 35 and the traction device on both guides 60a and 60b disposed on both sides of the traction device driver 50 and the pipe drawer 40 to guide the transfer of the steel pipe 10a. It is composed of a fixed frame 60 for supporting the drive unit 50 to be fixed, and a controller 70 for controlling the pipe drawer 40 and the traction device driver 50, respectively.

In addition, the pipe drawer 40 has a body 41 in which a large hole 411 is drilled to penetrate the inner center thereof, and a circumferential surface in communication with the hole 411 on one side of the body 41. A plurality of guide grooves (42a, 42b, 42c, ..., 42n-1, 42n) and radially formed along the guide grooves (42a-42n), respectively, to contact and press the outer peripheral surface of the steel pipe (10a) The pressing jig 44a, 44b, 44c,..., 44n-1, 44n, the face plate 47 positioned on the rear side of the body 41 and fastened by the pressing jig 44 and the bolt 443; Transfer gear 471 formed on the other end surface of the face plate 47 and the transfer gear 471 in the radial direction in order to transfer the face plate 47 to which the pressing jig 44 is attached in the radial direction The rotary plate 45 is formed with a spiral gear 451 is meshed with each other, and the pinion 45a is formed at the end of the rotary plate 45 to rotate the rotary plate 45 The pinion 45a is engaged with the drive gear 46a which is assembled to the body 41 and rotates, and the drive motor 46 provides a rotational force to the drive gear 46a, and the drive motor 46. The controller 70 is provided to control, and the controller 70 adjusts the rotational speed of the rotating plate 45 together with the driving motor 46 according to the feed rate of the steel pipe 10a passing through the pipe drawing machine 40. Each press jig 44a-44n which is linked with the rotating plate 45 by control is comprised so that it may respectively move outward or inward along the guide groove 42a-42n.

However, the conventional tapered steel drawing device having such a configuration has a complicated configuration of the pipe drawing machine itself, and applies enormous force in a linear direction while pressing the outer surface of the pipe with a pressing jig to form a taper in the pipe. Since the pipe had to be pulled out, a large amount of power was required, and the controller had to be precisely controlled according to the feed rate of the steel pipe, and in the case of insufficient control of the feed rate of the steel pipe and the pipe drawing machine, There is a problem that the taper is not constant.

In addition, the above method is to produce a metal tube for the lamppost or pole pole, if the thickness and diameter of the tube is very small, there was a problem that it is difficult to produce a tapered metal tube through the draw.

The present invention has been made in order to solve the above-mentioned conventional problems, by using a small power to produce a conical metal tube or metal rod having a uniform taper in the longitudinal direction irrespective of the diameter of the metal tube or metal rods, It is an object of the present invention to provide a conical metal tube or metal rod drawing processing method and apparatus for freely forming a taper in a metal tube or a metal rod according to a purpose such as a pole, a flag pole, a golf club, a nap, a folding antenna, a signal lamp, and the like.

The present invention for achieving the above object comprises the steps of fixing the one end of the workpiece, which is a metal rod or metal tube to the rotation fixing device; Pushing the other end of the workpiece into the sleeve of the tapered drawer and securing it with a ball holder; Rotating the workpiece through the rotation fixing device, and pulling the ball holder for the ball through the first traction device and repeating the process of drawing the outer peripheral surface of the rotating workpiece to be tapered into a cone having a desired inclination angle by a predetermined length; Separating the drawer and the sleeve from the end of the conical tapered workpiece, and separating the other end of the workpiece from the rotational fixing device.

At this time, the step of separating the workpiece from the rotation fixing device before or after the separation phase key is characterized in that the step of cutting the end locking portion of the workpiece formed during the drawing process by fixing the ball holder.

In addition, the drawing step is performed at least one to three times, the step of changing the longitudinal position of the sleeve to change the processing starting point of the workpiece in each drawing step; characterized in that it further comprises.

In addition, the final drawing step further comprises the step of moving the drawer in a straight line while rotating at a speed less than the rotational speed of the workpiece in the same direction as the rotational direction of the workpiece so that the end of the workpiece has a taper with a small diameter It is done.

And, if necessary, characterized in that it further comprises performing the drawing step divided into a large diameter drawing molding step, a conical drawing molding step and a small diameter drawing molding step.

On the other hand, the present invention device for achieving the object of the present invention comprises a rotation fixing device having a configuration consisting of a motor, a chuck drive unit and a chuck and bites one end of the workpiece, which is a metal rod or a metal tube, regardless of the size of the diameter; A sleeve in which the inner diameter of the holder for inserting the ball is tapered at a predetermined angle and fixed to the first table; A ball holder having a drawing ball installed at one end thereof is coupled to a holder case having a hollow for accommodating a workpiece. The holder case has a shape that is coupled to a shaft of a motor and is fixed to a second table to perform drawing operation. A drawer; First and second tables including screw sleeves of the second and first traction device, each of which includes the sleeve and the drawer, fixedly installed on the upper surface thereof, and both bottoms of which are movable to the left and right along the guider; Both ends of the screw rods, each of which is formed on the outer circumferential surface of the screw rod screwed to the screw engaging portion, are respectively rotatably coupled to the idle fixture, and one end of the screw rod is fixed to the first and second driving motors, respectively. First and second retractors for moving the sleeve and the drawer left and right by a desired distance through the first and second tables; And a controller for automatically controlling the driving of the first and second drive motors of the first and second traction devices, including the motor of the drawer, by a predetermined control method.

At this time, the inner diameter of the ball holder insertion hole or the inner surface of the ball holder holder insertion hole of the sleeve is characterized in that it is selected according to the diameter of the workpiece and the taper shape to be formed on the workpiece.

In addition, the inner surface of the ball holder holder insertion hole formed to be tapered on the sleeve, and the drawing ball installed in the ball holder is characterized in that the high-strength heat treatment.

In addition, the ball holder holder insertion hole of the sleeve is characterized in that formed as large diameter forming portion, conical forming portion and small diameter forming portion as necessary.

And, the diameter of the drawn ball accommodated in the ball holder for the drawer is selected according to the taper to be formed in the workpiece, characterized in that at least three or more are installed at equal intervals along the circumferential direction of the ball holder. .

In addition, the chuck of the rotation fixing device is characterized in that any one of the air chuck, hydraulic chuck, collet chuck.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 3 shows a plan view of the device of the present invention. Figure 4 shows a front view of the device of the present invention, Figure 5 (a) (b) is an enlarged cross-sectional view and side view of the main portion of the sleeve and the drawer of the device of the present invention, Figure 6 is another of the sleeve of the device of the present invention An exemplary cross-sectional side view is shown.

According to this, the apparatus of the present invention has a configuration consisting of the motor 211, the chuck drive unit 212 and the chuck 213, the rotation fixing device for rotating in the state of fixing the one end of the workpiece 20 irrespective of the size of the diameter 21;

A sleeve 22 having an inner diameter of the ball holder holder hole 221 tapered at a predetermined angle and fixed to the first table 24;

A ball holder 232 having a drawing ball 231 installed at one end thereof is coupled to a holder case 233 having a hollow 234 for accommodating the workpiece 20, and the holder case 233 is a motor ( A drawer 23 having a shape coupled to the shaft of 235 and fixed to the second table 25 to perform a drawing operation;

Screw coupling holes 271 and 261 of the second and first traction devices 27 and 26, including the sleeve 22 and the drawer 23, are respectively fixed to the upper surface and both bottoms are guiders 29 A first and a second table 24 and 25 movably moved from side to side along the side;

Both ends of the screw rods 262 and 272, each of which has a spiral portion formed on an outer circumferential surface of the screw coupling holes 261 and 271, are coupled to the idle fixtures 263, 264, 273 and 274, respectively. And a configuration fixed to the second driving motors 265 and 275, respectively, to move the sleeve 22 and the drawer 23 left and right by a desired distance through the first and second tables 24 and 25. First and second traction devices (26) (27);

The drive of the first and second drive motors 265 and 275 of the first and second traction devices 26 and 27 including the motor 235 of the drawer 23 is automatically performed by a predetermined control method. Control unit 28 to control the; characterized in that configured as.

At this time, the inner diameter of the ball holder holder hole 221 or the inner diameter of the ball holder holder hole 221 of the sleeve 22 according to the diameter of the workpiece 20 and the taper shape to be formed on the workpiece 20 Characterized in that it is selected.

In addition, the inner diameter of the ball holder holder hole 221 tapered to the sleeve 22 and the drawing ball 231 installed in the ball holder 232 is characterized in that the high-strength heat treatment.

In addition, the ball holder holder insertion hole 221 of the sleeve 22 is characterized in that formed into a large diameter forming portion 221a, a conical forming portion 221b and a small diameter forming portion 221c as necessary. do.

Then, the diameter of the drawing ball 231 accommodated in the ball holder 232 of the drawer 23 is selected according to the shape of the taper to be formed in the workpiece 20, the ball holder 232 At least three or more are installed at equal intervals along the circumferential direction.

In addition, the chuck 213 of the rotation fixing device 21 is characterized in that any one of the air chuck, hydraulic chuck, collet chuck.

On the other hand, Figures 7a to 7f shows a flow chart for explaining the method of the present invention, Figure 8 (a) (b) is a conical tapered pull-moved workpiece and a large diameter, cone portion and small diameter in accordance with the present invention It shows the perspective view of the workpiece (flank hoisting rod) formed by drawing.

According to this, the step of fixing one end of the workpiece 20 to the rotation fixing device 21;

Pushing the other end of the workpiece (20) into the sleeve (22) of the tapered drawer (23) and fixing it with a ball holder (232);

The outer peripheral surface of the workpiece 20 being rotated by rotating the workpiece 20 through the rotation fixing device 21 and pulling the ball holder 232 of the drawer 23 through the first towing device 26 is desired. Dividing the draw several times so as to taper to a conical shape having an inclination angle and repeating the same several times;

Separating the sleeve 22 and the drawer 23 from the ends of the conical tapered workpiece 20, and separating the other end of the workpiece 20 from the rotation fixing device 21; .

At this time, the step 201 of the workpiece 20 formed at the time of drawing processing by fixing the ball holder (232) after the separation step before or after separating the workpiece 20 from the rotation fixing device 21. It characterized in that the step of further cutting.

In addition, the drawing step is performed at least one to three times, in order to change the processing start point of the workpiece 20 in each drawing step by using the second traction device 27 in the longitudinal position of the sleeve 22 It is characterized in that it further comprises the step of changing.

In addition, when the drawing step is performed three times as described above, a large diameter 20a draw molding step and a cone portion 20b drawing molding step and a small diameter 20c drawing molding step are performed as necessary. It is done.

In the final drawing step, if necessary, using the motor 235 of the drawer 23, the ball holder (232) in the same direction as the rotation direction of the workpiece 20 than the rotational speed of the workpiece 20 And moving in a straight line while rotating at a small speed so that the end of the workpiece has a taper of small diameter.

At this time, the end diameter of the workpiece 20 is characterized in that formed to a minimum to 3mm.

On the other hand, the device and method of the present invention can be applied to the rod as it is, not the hollow tube as it is, the process is the same, the following method of manufacturing the metal rod will be omitted and will be described in detail mainly on the metal tube.

Referring to the operation and effect of the present invention made of such a configuration and steps as follows.

First, the apparatus of the present invention mainly includes a rotation fixing device 21, a sleeve 22, a drawer 23, first and second tables 24 and 25, and a first and second traction device 26 ( 27).

At this time, since the rotation fixing device 21 is composed of a motor 211 and the chuck driving unit 212 and the chuck 213 made of any one of the air chuck, hydraulic chuck, collet chuck, the workpiece 20 regardless of the size of the diameter. In the state where the one end of the squeeze is fixed, the metal tube or the metal rod which is the workpiece 20 bitten by the chuck 213 can be rotated with little power.

In addition, the sleeve 22 is provided with a ball holder holder insertion hole 221, the inner diameter is tapered at a predetermined angle and is fixed to the upper surface of the first table 24 to correspond to the driving direction of the second towing device 27 The guider 29 moves to the left and right and changes the starting point of the workpiece 20 in the drawing step.

At this time, the inner diameter of the ball holder holder hole 221 or the inner taper of the ball holder holder hole 221 corresponds to the diameter of the workpiece 20 and the taper shape to be formed on the workpiece 20. Is determined.

On the other hand, the sleeve 22 is basically a tapered ball holder holder insertion hole 221 is inclined at a predetermined angle as a base, but if necessary, as shown in Figure 6 large diameter molded part 221a And formed into a conical forming portion (221b) and a small diameter forming portion (221c) and when drawing the workpiece 20 having a large diameter, a middle portion having a conical shape, and an upper portion having a small diameter again, such as a flag pole Can also be used.

In addition, the drawer 23 is a hollow in which the workpiece 20 is accommodated on one side of the holder case 233 fixed to the upper surface of the second table 25 (that is, the surface opposite to the sleeve 22). 234 is provided and the ball holder 232 which the drawing ball 231 is provided in the front end side is couple | bonded with the holder case 233 as a basic structure.

In addition, the other side portion of the holder case 233 is coupled to the shaft of the motor 235 as necessary to be coupled to the holder case 233 when the workpiece 20 is drawn out and inserted into the sleeve 22. Pulling in the fixed state of the end of the workpiece 20 to rotate the ball holder (232) to draw the workpiece 20 to be tapered.

At this time, the inner diameter of the ball holder holder hole 221 tapered in the sleeve 22 and the drawing ball 231 installed in the ball holder 232 is a high-strength heat treatment to minimize the wear during drawing will be.

In addition, the diameter of the drawing ball 231 accommodated in the ball holder 232 of the drawer 23 is determined according to the shape of the taper to be formed in the workpiece 20, the circumference of the ball holder 232 It is preferable to provide at least three or more at equal intervals along the direction.

On the other hand, the first and second tables 24, 25 are respectively slidably installed on the guiders 29 provided at the bottom of both ends in parallel with each other, and the sleeve 22 and the drawer 23 are disposed at the center of the upper surface thereof. ) Is fixedly installed, and screw coupling holes 271 and 261 of the second and first towing apparatuses 27 and 26 are fixed to one side of both sides of the upper surface, respectively. In response to the drive of the devices 27, 26, the first and second tables 24, 25 are slidably moved left or right along the guider 29 and the sleeve 22 or the drawer 23 is moved. Will be able to move straight.

In addition, both ends of the first and second traction devices 26 and 27 are idle fixtures in a state in which screw rods 262 and 272 having threaded portions are coupled to the screw coupling holes 261 and 271. (263, 264) (273, 274), as well as a fixed portion of the first and second drive motors (265, 275) at one end thereof in response to the control signal of the control unit 28 in response to the first and second The driving rods 262 and 275 are rotated in the forward or reverse direction and screwed to the screw coupling holes 261 and 271 secured to the second and first tables 25 and 24, respectively. It is possible to push or pull the drawer 23 and the sleeve 22 fixed to the second and first tables 25 and 24 through left and right rotation through the forward and reverse rotation of 272. .

In addition, in the above, the idle fixtures 263, 264, 273, 274 of the rotation fixing device 21, the guider 29, and the first and second traction devices 26, 27 are fixedly installed on the upper surface of the body 30, respectively. Take form.

When forming the tapered workpiece 20, which is a metal rod or a metal tube, by using the apparatus of the present invention, one end of the workpiece 20 is first fixed to the chuck 213 of the rotation fixing device 21 as shown in FIG. The length for forming the taper on the workpiece 20 is equally divided into predetermined lengths, and a portion in which a lot of processing is performed is selected as one time of processing.

Subsequently, as shown in FIG. 7B, the free end of the workpiece 20 is pushed into the sleeve 22 until the processing time is once and fixed with a ball holder 232 to mount the workpiece 20 on the drawer 23. As shown in FIG. 7C, the drawer 23 is pulled to the right in the drawing through the first traction device 26 while driving the workpiece 20 at a constant speed by driving the rotation fixing device 21. The predetermined section of the workpiece 20 is processed once by the rotation of the drawing ball 231 installed on one side of the tip to taper.

As such, when the workpiece 20 is tapered, the workpiece 20 can be pulled to the right through the first towing device 26 while rotating the workpiece 20 at a constant speed through the rotation fixing device 21. When the workpiece 20 is tapered by the rotation of the drawing ball 231 provided at one end of the dragon holder 232, the workpiece 20 may be drawn out with a small power.

Subsequently, when the one-time taper processing in the predetermined section is completed, the operation of the rotation fixing device 21 and the first towing device 26 is stopped, and the second towing device 27 is operated to operate the first table 24. By moving the sleeve 22 to the left by a predetermined distance through the ball (231) installed in the ball holder 232 is positioned at the starting point of the processing twice as shown in Figure 7d to fix the workpiece 20 and then again By driving the rotation fixing device 21 to rotate the workpiece 20 at a constant speed while pulling the drawer 23 to the right in the drawing through the first towing device 26 one end of the ball holder (232) The predetermined section of the workpiece 20 is processed twice by the rotation of the drawing ball 231 installed in the tapering.

When the second taper processing is completed in the predetermined section as described above, the operation of the rotation fixing device 21 and the first traction device 26 is stopped again, and the second traction device 27 is operated again. By moving the sleeve 22 to the left by a predetermined distance through the first table 24 so that the drawing ball 231 installed in the ball holder 232 is positioned at the starting point of processing three times as shown in FIG. 20) and then the rotation fixing device 21 is again driven to rotate the workpiece 20 at a constant speed while pulling the drawer 23 to the right in the drawing through the first towing device 26 for the ball holder. When the predetermined section of the workpiece 20 is processed and tapered three times by the rotation of the drawing ball 231 provided at one end of the tip portion 232, the entire workpiece 20 is as shown in FIG. It is drawn conical and tapered.

5 (a) and 5 (b) show enlarged cross-sectional views and side views of the main parts of the sleeve 22 and the drawer 23 in accordance with the present invention, corresponding to the number of drawing times and the time points of drawing. The drawing ball 231 installed in the ball holder 232 has a state spaced apart from each other in response to the outer diameter of the workpiece 20 at the starting point of drawing, and is narrowed by drawing a predetermined length so that the end diameter of the workpiece 20 is also measured. It turns out that it becomes small according to upper angle.

On the other hand, in the present invention has been exemplified three times the drawing process, the number of times the drawing process through the above procedure can be changed depending on the length of the workpiece 20 and the like.

In addition, as shown in (b) of FIG. 8, the lower part has a large diameter, the middle part has a conical shape, and the upper part has a tapered ball holder inserted when drawing the workpiece 20 having a small diameter again. A sleeve 22 formed by dividing the hole 221 into a large diameter forming part 221a, a conical forming part 221b and a small diameter forming part 221c as shown in FIG. 6 is mounted on the first table 24. What is necessary is just to draw out three times in the same manner as mentioned above.

At this time, in the last drawing step, if necessary, the ball holder 232 using the motor 235 of the drawer 23 is the same as the rotation direction of the workpiece 20 rotated by the rotation fixing device 21 Direction, but in order to prevent excessive force from being applied to the workpiece 20, while rotating the drawing machine 23 to the right while rotating at a speed smaller than the rotation speed of the workpiece 20, the end diameter of the workpiece 20 It can also be tapered to this small diameter.

In this way, the rotational speed of the ball holder 232 is smaller than the rotational speed of the workpiece 20 to rotate in the same direction, and when the drawing operation of the workpiece 20 is performed, the end diameter of the workpiece 20 is at least 3 mm. It can be formed thin.

Further, after drawing the workpiece 20 in a conical shape through the drawing process or completing the drawing in a form such as a flag pole, the first and second towing devices 26 and 27 are driven. The second and first tables 24 are moved to the right as shown in FIG. 7F to separate the drawer 23 and the sleeve 22 from the ends of the workpiece 20.

Thereafter, by using a separate cutter not shown in the above state, the end engaging portion 201 of the workpiece 20 formed at the time of drawing is cut by fixing the holder 232 for ball viewing. a) (b) may be processed, the workpiece 20 is separated from the rotation fixing device 21 to move the workpiece 20 to another place, and then using a cutter of the workpiece 20 You may cut | disconnect the locking part 201 formed in the edge part.

Although the above-described embodiment has been described with respect to the most preferred embodiment of the present invention, it is not limited to the above embodiment, it will be apparent to those skilled in the art that various modifications are possible without departing from the technical spirit of the present invention.

As described above, according to the present invention, by drawing a metal rod or a metal tube in a conical shape using a drawing ball, drawing can be performed with less power, and if necessary, the workpiece is rotated in the same direction as the work piece. It is also very useful invention, such as processing the long and short diameter of the very small (for example about 3mm), and can process a conical metal tube and a metal rod with a uniform taper in the longitudinal direction without highly precise control.

Claims (16)

Fixing one end of the workpiece to the rotation fixing device; Pushing the other end of the workpiece into the sleeve of the tapered drawer and securing it with a ball holder; Rotating the workpiece through the rotation fixing device, and pulling the ball holder for the ball extractor through the first towing apparatus and repeating the drawing several times so that the outer peripheral surface of the rotating workpiece is tapered; Separating the sleeve and the drawer from the end of the conical tapered workpiece, and the other end of the workpiece from the rotation fixing device; Conical metal tube or metal rod drawing processing method comprising a. The method according to claim 1, And changing the longitudinal position of the sleeve in order to change the starting point of the workpiece in the drawing step. The method according to claim 2, After the step of separating the workpiece from the rotation fixing device or the separation step after the separation of the end of the workpiece formed during the drawing process by the fixing of the ball holder holder further comprises a step of cutting through a cutter Conical metal tube or metal rod drawing method. The method according to claim 1, The drawing step may be performed at least one to three times, wherein the lengthwise position of the sleeve is changed by using a second traction device in order to change the processing starting point of the workpiece in each drawing step. Conical metal tube or metal rod drawing processing method having a taper. The method according to claim 1, In the last drawing step, the ball holder is rotated in the same direction as the rotation direction of the workpiece by using the motor of the drawer, but moves in a straight line while rotating at a speed smaller than the rotation speed of the workpiece so that the end of the workpiece is small. A tapered conical metal tube or metal rod drawing method, further comprising tapering to have a diameter. The method according to claim 5, Conical metal tube or metal rod drawing method having a taper, characterized in that the end diameter of the workpiece is formed to a minimum of about 3mm. A rotation fixing device which rotates in a state where the one end of the workpiece is fixed; A sleeve in which the inner diameter of the holder for inserting the ball is tapered at a predetermined angle and fixed to the first table; A drawing unit having a configuration in which a ball holder having a ball drawn at one end thereof is coupled to a holder case in which a hollow for accommodating a workpiece is formed and fixedly installed at a second table to perform a drawing operation; First and second tables including screw sleeves of the second and first traction device, each of which includes the sleeve and the drawer, fixedly installed on the upper surface thereof, and both bottoms of which are movable to the left and right along the guider; First and second traction devices for moving the sleeve and the drawer from side to side through the first and second tables by a desired distance; Conical metal tube or metal rod drawing processing apparatus having a taper, characterized in that consisting of; The method according to claim 7, The rotary fixing device is a conical metal tube or metal rod drawing processing apparatus having a taper, characterized in that consisting of a motor, a chuck drive unit and a chuck. The method according to claim 8, The chuck is a conical metal tube or metal rod drawing apparatus having a taper, characterized in that any one of the air chuck, hydraulic chuck, collet chuck. The method according to claim 7, Conical metal tube or metal rod drawing processing apparatus having a taper, characterized in that the motor is attached to the holder case to rotate the ball holder as necessary. The method according to claim 7, The first and second traction apparatus has both ends of the screw rod screwed to the screw engaging portion formed on the outer circumferential surface of the first and second traction device, respectively, as well as the first and second driving motors are coupled to one end thereof, respectively. Conical metal tube or metal rod drawing processing apparatus having a taper, characterized in that having a. The method according to claim 7, Ball holder holder insertion hole of the sleeve is a conical metal tube or metal rod drawing processing apparatus having a taper, characterized in that formed by being divided into a large diameter portion, a conical portion and a small diameter portion. The method according to claim 7, Taper size of the ball holder insertion hole inner diameter of the sleeve or the ball holder holder insertion hole inner surface is selected according to the diameter of the workpiece and the taper shape to be formed on the workpiece with a tapered conical metal tube or metal rod drawing device . The method according to claim 7, An inner surface of the ball holder insert hole formed in the sleeve and tapered in the sleeve, and the drawing ball installed in the ball holder is a high strength heat treatment, characterized in that the conical metal tube or metal rod drawing processing apparatus having a taper. The method according to claim 7, The diameter of the drawing ball accommodated in the ball holder of the drawer is a conical metal tube or metal rod drawing processing apparatus having a taper, characterized in that selected according to the shape of the taper to be formed on the workpiece. The method according to claim 15, The drawing ball is a conical metal tube or metal rod drawing processing apparatus having a taper, characterized in that at least three or more installed at equal intervals along the circumferential direction of the ball holder.

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