JP2009095858A - Drawing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drawing apparatus with which tube shrinking work is performed on a tubular base stock having thin wall thickness and a tubular base stock having a large diameter without generating excessive deformation. <P>SOLUTION: In the drawing apparatus which includes a roller mounting base 13 for supporting drawing rollers R slidably in the radial direction on the top of the rotating spindle 10 and also made to perform the tube shrinkage of the top of the fixed tubular base stock by moving the drawing rollers R in the radial direction, back up rollers 20 which are situated inside the tubular base stock when performing the tube shrinkage and moved in the radial direction of the spindle 10 are arranged on the roller mounting base 13. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a drawing apparatus, and more particularly to an improvement of a drawing apparatus that performs drawing by moving a drawing roller attached to the tip of a rotating main shaft in a radial direction.

  Conventionally, as a drawing device for drawing a cylindrical member such as a pipe tip, the applicant previously proposed, and supported by a roller mounting base attached to the tip of a rotating main shaft so as to be slidable in the radial direction, There has been proposed a drawing apparatus that performs drawing on the tip of a pipe to be processed, which is a cylindrical material fixed in this way (see, for example, Patent Document 1).

12 to 14 show an example of a conventional drawing apparatus.
As shown in FIG. 12, the drawing device 3 includes a main shaft mechanism 2 and a support mechanism (not shown) that supports the pipe to be processed so as to face the main shaft mechanism 2. 11 is mounted on a guide rail 5 formed on the base 4 so as to be movable in the left-right direction in the figure by a drive motor 6 and a drive screw 7.

  The main shaft mechanism 2 is provided at the front end of the main shaft 10 and a main shaft 10 that is rotationally driven by a driving pulley P connected to an appropriate driving motor (not shown) and rotatably supported by a bearing base 11 via a bearing 12. Provided with a roller mounting base 13.

  The roller mount 13 is attached to the tip of the main shaft 10 via a flange 16 and, as shown in FIG. 13, a main mount 14 having a guide groove 14a for guiding the support member 17 of the squeeze roller R in the radial direction. It consists of and.

  The supporting member 17 of the squeezing roller R includes a main body part 17b to which the squeezing roller R is attached and a cover 17c for holding the main body part 17b in the guide groove 14a as main components.

Then, for example, as shown in FIG. 12, the main shaft 10 has a hollow structure, the cam shaft 19 with the cam plate 18 provided with the spiral groove 18a attached to the tip, the main shaft 10 with the main mount 14 attached to the tip. A guide pin 17 a that is housed in the projection roller 17 and protrudes from the support member 17 of the squeezing roller R is inserted into the spiral groove 18 a, and the main shaft 10 and the cam shaft 19 are engaged with each other via the speed change mechanism 30. The roller R is moved in the radial direction.
In this case, the squeezing roller R at the position (initial position) shown in FIG. 13 rotates the cam plate 18 relative to the main mounting base 14 (in the illustrated example, counterclockwise), and is shown in FIG. It moves radially inward to the position, and the tip of the pipe for processing is processed.

  The mandrel 40 inserted into the pipe to be processed is disposed at the tip of the shaft 41 accommodated in the cam shaft 19 and plays a role of regulating the inner diameter (outer diameter) when processing the pipe to be processed.

Japanese Patent No. 3514730

  By the way, the cylindrical material to be processed by this drawing device can be subjected to tube reduction without abnormal deformation when the outer diameter is about 150 mm and the wall thickness is about 2 mm. When the outer diameter is about 150 mm and the wall thickness is 1.5 mm or less, or when the outer diameter is 200 mm or more even if the wall thickness is 2 mm, before the tip inner diameter portion of the pipe to be processed follows the mandrel, Due to the pressing force of the squeezing roller, there is a problem that the processed part is abnormally deformed inward and normal molding cannot be performed.

  In view of the problems of the above-described conventional drawing apparatus, the present invention performs tube-reducing processing on a thin cylindrical material or a large-diameter cylindrical material without causing abnormal deformation. An object of the present invention is to provide a drawing device capable of performing the above-mentioned.

  In order to achieve the above object, the drawing apparatus of the present invention includes a roller mounting base that supports the drawing roller in a slidable manner in the radial direction at the tip of the rotating main shaft, and moves the drawing roller in the radial direction. In the drawing device that reduces the tube end of a fixed cylindrical material, the roller mounting base is positioned inside the cylindrical material and moves in the radial direction of the main shaft when the tube is reduced. A backup roller is provided.

  In this case, a cam plate having a hollow structure in the main shaft and engraved with a spiral groove into which a guide pin protruding from a support member that supports the squeezing roller is fitted at the tip of the cam shaft that is fitted concentrically with the main shaft. The squeezing roller can be moved in the radial direction by the deformed portion of the spiral groove.

  According to the drawing apparatus of the present invention, the roller mounting base is provided with a backup roller that is located inside the cylindrical material and moves in the radial direction of the main shaft during the tube contraction processing. The drawing process prevents the material from flowing abnormally inside due to the pressing of the squeezing roller, and the processed part does not deform abnormally even if it is a thin cylindrical material or a large-diameter cylindrical material. An apparatus can be provided.

  The main shaft has a hollow structure, and is provided with a cam plate in which a spiral groove into which a guide pin protruding from a support member that supports the squeezing roller is fitted is engraved at the tip of a cam shaft that is inserted concentrically with the main shaft. When the squeezing roller is moved in the radial direction by the deformed portion of the spiral groove, the squeezing roller is moved in the radial direction by rotating the cam plate relative to the main shaft. Can be controlled accurately.

  Embodiments of a drawing apparatus according to the present invention will be described below with reference to the drawings.

  1 to 7 show an embodiment of the drawing apparatus of the present invention.

  The drawing apparatus 1 includes a roller mounting base 13 that supports the drawing roller R at the tip of the main shaft 10 so as to be slidable in the radial direction, and the cylindrical roller fixed by moving the drawing roller R in the radial direction. In the drawing processing apparatus, the tip of the tube is contracted, and the roller mounting base 13 is positioned inside the cylindrical material during the contraction processing and moves in the radial direction of the main shaft 10. A roller 20 is provided.

  The roller mounting base 13 is attached to the tip of the main shaft 10 via a flange 16 and can be provided with only the squeezing roller R as in the conventional example, but the squeezed roller R and the squeezing roller R were contracted. A cutting roller C that cuts unnecessary portions at the tip of the pipe may be provided. In this embodiment, an example in which the cutting roller C is provided will be described.

  In order to move the squeezing roller R and the cutting roller C in the radial direction, the main shaft 10 has a hollow structure, and the squeezing roller R and the cutting roller C are supported at the tip of a cam shaft 19 fitted concentrically with the main shaft 10. The cam plate 18 having the spiral groove 18a into which the guide pins 17a and 54 protruding from the supporting member 17 are inserted is rotated relative to the main shaft 10.

  As shown in FIG. 8, a guide pin 17a and a guide pin 54 for shifting the cutting roller C, which will be described later, are fitted in a spiral groove 18a, and the spiral groove 18a is approximately 270 degrees, and the entire circumference is arranged. Dividing into four equal parts to α, β, γ, and δ, the parts with angles β and δ are the concentric circles, the parts with angles α and γ are the deformed parts, and the guide pins 17a and 54 are deformed. When passing through the portions α and γ, the guide pins 17 a and 54 move in the radial direction of the cam plate 18.

Then, as shown in FIGS. 9 to 10, the support member 17 on which the cutting roller C is arranged is configured so that the moving direction of the guide slider 51 and the moving direction of the roller slider 52 are reversed by the reverse mechanism 50. ing.
The reverse mechanism 50 includes a rack 51a engraved on the upper surface of the guide slider 51 on which the guide pins 54 are disposed, a rack 52a engraved on the bottom surface of the roller slider 52 on which the cutting roller C is disposed, and both the racks 51a, The pinion 53 is rotatably arranged between the 52a.

  The guide slider 51 is slidably attached to the guide groove 14a from the bottom surface of the main mounting base 14 by holding plates 55, 55, and a guide pin 54 to be inserted into the spiral groove 18a of the cam plate 18 is disposed on the lower surface. The rack 51a is engraved on the upper surface.

  The pinion 53 is rotatably disposed on the intermediate bearing 56 disposed in the main mount 14 so as to mesh with the rack 51a of the guide slider 51.

  The roller slider 52 on which the cutting roller C is disposed on the upper surface is slidably disposed in the guide groove 14a so as to be sandwiched between the intermediate bearing 56 and the cover 17c, and a rack 52a carved on the lower surface thereof. Is engaged with the pinion 53.

As a result, the cutting roller C moves in the direction opposite to the direction in which the guide pin 54 that enters the spiral groove 18a of the cam plate 18 passes through the deformed portions α and γ.
The retrograde mechanism 50 may be disposed on the support member 17 provided with the squeezing roller R without being provided on the support member 17 provided with the cutting roller C.

In order to make a relative speed difference between the main shaft 10 and the camshaft 19, a speed change mechanism 30 is used.
As the speed change mechanism 30, for example, a flexure engagement type drive transmission device is used. As shown in FIGS. 1 and 11, the outline of the speed change mechanism 30 is a pair of outer rings 31 engaged with the main shaft 10 and the cam shaft 19, respectively. 32, a flexible tooth wheel 33 that meshes with a tooth groove formed on the inner surface of each outer ring (both have the same number of teeth) and has tooth shapes with different numbers of teeth, and the tooth wheel 33 is elliptical. And a wave forming ring 34 that is supported so as to be pivotable and meshes at two positions opposite to the tooth gap.

In this speed change mechanism 30, when the wave forming wheel 34 is fixed and one outer ring 31 is driven, the toothed wheel 33 follows and rotates. Accordingly, the other outer ring 32 is also rotated via the tooth wheel 33. At this time, the number of teeth of both the outer rings 31 and 32 is the same, and therefore, the outer rings 31 and 32 are rotated at the same number of rotations. On the other hand, the number of teeth of the tooth wheel 33 is usually smaller than that of the outer rings 31 and 32 (for example, two fewer).
Next, the outer ring 31 is fixed, and the wave forming ring 34 is rotated. Reference numeral 35 denotes a drive reduction motor. At this time, the tooth wheel 33 has a difference in the number of teeth from the outer ring 31, and is rotated by this, and the other outer ring 32 is rotated by this.
Therefore, by rotating the wave forming ring 34 while rotating the outer ring 31, the relative rotational speed of the other outer ring 32 relative to the outer ring 31 varies. The variable rotational speed is proportional to the rotational speed of the wave forming wheel 34. In this way, the differential is performed by the flexibly meshing drive transmission device.

In FIG. 1, 36 is a support gear for the outer ring 31, 37 is a support gear for the outer ring 32, 38 is a drive gear that is attached to the main shaft 10 and meshes with the support gear 36, and 39 is a driven gear that meshes with the support gear 37.
Thereby, the relative speed difference (differential) of the outer ring 32 with respect to the outer ring 31 can rotate the cam plate 18 via the cam shaft 19 to move the squeezing roller R and the cutting roller C in the radial direction.

  Further, the mandrel 40 that regulates the inner diameter (outer diameter) when processing the pipe to be processed does not need to be disposed when the roller portion 21 of the backup roller 20 substitutes for its role.

  The number of the squeezing rollers R and the cutting rollers C is not particularly limited, but in this embodiment, as shown in FIG. 2, two squeezing rollers R and two cutting rollers C are provided at positions facing each other. As shown in the figure, backup rollers 20 are arranged between the squeezing roller R and the cutting roller C, which are arranged so that the intervals between the adjacent squeezing rollers R and the cutting rollers C are different from each other. Is arranged.

  The guide pins 17a and 54 of the upper drawing roller R and right cutting roller C are inserted into the same spiral groove 18a, and the lower drawing roller R and left cutting roller C guide pins are shown. 17a and 54 are inserted into a spiral groove 18a different from the spiral groove 18a.

  Accordingly, when the guide pins 17a and 54 of the squeezing roller R and the cutting roller C pass through the deformed portions α and γ, that is, from the initial position of FIG. By rotating, the guide pins 17 a and 54 move in the radial direction of the cam plate 18.

As shown in FIG. 3, the backup roller 20 has a roller portion 21, a roller portion 21 attached to the tip, a rod portion 22 that moves in a direction perpendicular to the main shaft 10, and a rod portion 22 that is slidably held. A case portion 24 fixed inside the roller mount 13 and a piston rod 25 which is inserted into a pressure chamber 23 formed in the rod portion 22 and forms a piston 25c dividing the pressure chamber 23 into two chambers. .
The fluid coupling 27 disposed at the end of the camshaft 19 is connected to the camshaft 19, the main shaft 10, and the fluid passages 26a and 26b formed in the flange 16 through the fluid passages 25a and 25b formed in the piston rod 25. A fluid is supplied into pressure chambers 23 a and 23 b formed in the rod portion 22 to control the movement of the rod portion 22.

  Although the shape of the roller portion 21 is not particularly limited, the roller portion 21 is preferably formed in a cylindrical shape so that the inner surface of the end portion of the tubular material to be contracted can be held. In addition to the shape, a large number of rotating bodies such as bearings may be connected.

  The rod portion 22 preferably has a polygonal cross section or an elliptical shape so that the roller portion 21 disposed at the tip does not oscillate. The cross section can also be made circular by applying.

  The piston rod 25 is fixed to the end portion of the case portion 24, forms fluid passages 25a and 25b connected to the fluid passages 26a and 26b inside, and communicates with the pressure chambers 23a and 23b, respectively.

  As a result, a fluid (for example, pressure oil) flows from the fluid supply source 28 into the fluid passage 26a, and the pressure chamber 23a is boosted via the fluid passage 25a of the piston rod 25, thereby the rod portion provided with the roller portion 21. 22 moves in the direction approaching the center of the main shaft 10 (lower side in the figure), and moves in the reverse direction by flowing fluid from the fluid supply source 28 into the fluid path 26b.

  The tube-reducing process of the cylindrical material is usually performed in multiple steps. In the drawing apparatus 1 of the present invention, the diameter (the diameter at which the drawing roller R reduces the end of the material in one step ( In the first step, the position where the roller portion 21 comes into contact with the inner peripheral surface of the end portion of the cylindrical material than the contracted tube inner diameter D1 shown in FIG. 4 (in the first step, the backup outer diameter d1 shown in FIG. 4). ) Is set to a slightly larger position, and the pressure of the fluid holding the backup roller 20 (for example, oil pressure) is the same as that when the squeezing roller R contracts the cylindrical material. By setting the pressure smaller than the pressing force and withstanding the deformation of the cylindrical material, the roller portion 21 moves in a direction approaching the center of the main shaft 10 with the pressing force of the squeezing roller R. ing.

  In the above-described configuration, the procedure for reducing the end of the cylindrical material having the inner diameter D to the inner diameter D3 in the third step without arranging the mandrel 40 in FIGS. 4 to 6 will be described.

First, when the inner diameter of the end portion of the material is reduced to D1 by the squeezing roller R in the first step, the roller portion 21 is moved to a position where the backup outer diameter is d1 (d1> D1), and the reduction tube processing is started. To do.
At this time, in the case of a thin cylindrical material or a large-diameter cylindrical material, abnormal deformation tends to occur inward at the initial stage immediately after the start of the tube contraction, as shown in FIG. As shown, before the squeezing roller R abuts on the outer peripheral surface of the material, it is preferable that the roller portion 21 abuts on the inner peripheral surface of the material (d1 = D).

  When the tube portion is contracted by the squeezing roller R, the roller portion 21 moves in the direction approaching the center of the main shaft 10 with the pressing force of the squeezing roller R, and the inner diameter of the end portion of the material becomes D1. The first step ends (see FIG. 4B).

As shown in FIG. 4 (c), the backup outer diameter d1 ′ is set slightly smaller than the inner diameter D of the cylindrical material (d1 ′ <D), and the inner circumference of the end portion of the material is immediately after the start of the tube shrinking process. You may make it a surface contact | abut to the roller part 21. FIG.
In this case, when the end portion of the material is contracted by the pressing force of the squeezing roller R and the inner diameter of the material becomes d1 ′, the inner peripheral surface of the material contacts the roller portion 21 and abnormally deforms inside. The inner peripheral surface is regulated by the roller portion 21 without any problem.
Then, the contraction processing is further continued by the squeezing roller R from the state in which the inner diameter of the end portion of the material becomes the backup outer diameter d1 ′, and the roller unit 21 moves the center of the main shaft 10 in accordance with the pressing force of the squeezing roller R. When the inner diameter of the end of the material reaches D1, the first step is completed.

  Next, in the second step, the inner diameter of the end portion of the material is reduced to D2 by the squeezing roller R, and the roller portion 21 is moved to a position where the backup outer diameter is d2 (d2> D2) (FIG. 5). (Refer to FIG. 5B to FIG. 5C).

In the third step, which is the final step, the inner diameter of the end of the material that is the final shape is reduced to D3, and the roller portion 21 is moved to a position where the backup outer diameter is d3 (d3> D3) ( In the same manner as in the first step and the second step, the tube shrinking process is performed on the end portion of the material (see FIG. 6B).
Then, when the inner diameter of the end portion of the material reaches the processing target D3, the stoppers S arranged at the end portions of the opposing rod portion 22 come into contact with each other, and further transition of the roller portion 21 is prevented, The roller portion 21 that functions as a single unit functions as a mandrel (see FIG. 6C), the tube contraction processing is completed, unnecessary portions at the ends are cut by the cutting roller C, and the processing ends.

  In addition, as shown in FIG. 7, without using the opposing roller part 21 as a mandrel, the spindle 10 is stopped immediately before entering the third step or when the inner diameter of the material becomes d3 in the third step, The squeezing roller R is once separated from the material, the roller portion 21 of the backup roller 20 is moved to a retracted position away from the center of the main shaft 10, the mandrel 40 is advanced (right side in the figure), and the tube contracting process is completed. It doesn't matter.

  The drawing apparatus of the present invention has been described based on the embodiments. However, the present invention is not limited to the configurations described in the above embodiments, and the configurations are appropriately changed without departing from the spirit of the present invention. It is something that can be done.

  The drawing apparatus of the present invention has a characteristic that even a cylindrical material that is likely to be deformed abnormally can be contracted without causing abnormal deformation. It can be suitably used for the application of a drawing apparatus that performs a tube shrinking process on a material or a cylindrical material having a large diameter.

1 is an overall view showing a drawing apparatus of the present invention. It is a top view which shows the roller mounting base of the drawing apparatus of this invention. It is XX sectional drawing in FIG. 2 explaining a backup roller. It is sectional drawing of a part notch explaining the 1st cycle of a processing procedure, (a) is an initial state, (b) is the state where the internal diameter of the edge part of material became D1, (c) Backup outer diameter A state in which d1 ′ is set slightly smaller than the inner diameter D of the cylindrical material is shown. It is sectional drawing of a part notch explaining the 2nd cycle of a process sequence, (a) is an initial state, (b) is the state in the middle of a process, (c) is the internal diameter of the edge part of a raw material to D2. Indicates the state. It is sectional drawing of a part notch explaining the 3rd cycle of a processing procedure, (a) is an initial state, (b) is in the middle of processing, (c) is the inner diameter of the edge of a material as D3, The state which the roller part is functioning as a mandrel is shown. It is sectional drawing of a part notch explaining another procedure of the 3rd cycle of a processing procedure, (a) is an initial state, (b) is a state in the middle of processing, (c) is a mandrel inserted, This shows a state in which the inner diameter of the end portion is D3. It is a top view which shows a cam board. It is YY sectional drawing in FIG. It is ZZ sectional drawing in FIG. BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing of a transmission mechanism, (a) is a front view of a transmission mechanism, X1-X1 sectional view taken on the line in (b), (b) is Y1-Y1 sectional drawing in (a), (c) is description of a transmission action. FIG. It is a general view which shows the conventional drawing apparatus. It is a top view which shows the initial state of a roller mounting base. It is a top view which shows the movement state of the aperture roller of a roller mounting base.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Drawing apparatus 2 Main shaft mechanism 10 Main shaft 13 Roller mounting base 17 Support member 17a Guide pin 18 Cam plate 18a Spiral groove 19 Cam shaft 20 Backup roller 21 Roller portion 22 Rod portion R Squeeze roller

Claims (2)

  At the tip of the rotating spindle, it is equipped with a roller mounting base that supports the squeeze roller in a slidable manner in the radial direction, and the squeeze roller is moved in the radial direction so that the tip of the fixed cylindrical material is reduced. In the drawing apparatus, the roller mounting base is provided with a backup roller that is located inside the cylindrical material and moves in the radial direction of the main shaft when the tube is reduced. .   The main shaft has a hollow structure, and is provided with a cam plate in which a spiral groove into which a guide pin protruding from a support member that supports the squeezing roller is fitted is formed at the tip of a cam shaft that is fitted concentrically with the main shaft. 2. The drawing apparatus according to claim 1, wherein the drawing roller is moved in the radial direction by the deformed portion of the groove.

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