JP2006110714A - Cutting method of pipe and cutting device of pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cutting method of a pipe capable of cutting the pipe so as to eliminate growth of an outward burr on a cutting part and remainder of outward shearing inside stress. <P>SOLUTION: Shearing work to deliver a piece of shearing blade 13 in a direction from an outer peripheral surface to an inner peripheral surface of the pipe concerning each part in the peripheral direction of the pipe 1 is carried out on the overall periphery of the pipe 1. It is desirable that this shearing work is carried out by using a plural number of the shearing blades 13 arranged side by side in the peripheral direction of the pipe 1 on the outside of the pipe 1 or by using a piece of the shearing blade 13 arranged on the outside of the pipe 1. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for cutting a pipe used for various purposes including a photosensitive drum base, a pipe cut by the cutting method, a pipe straightening method, a pipe cutting device, a pipe manufacturing method, and a pipe manufacturing device.

  For example, a photosensitive drum substrate that supports a photoconductive photosensitive layer such as selenium or an organic photosensitive member in a photosensitive drum of an electronic copying machine, a laser printer, or the like is, for example, a pipe made of a drawing material drawn by a draw bench or the like. Formed from. This type of pipe is required to have high dimensional accuracy (eg, straightness) and high surface (outer peripheral surface) accuracy in order to obtain high image quality.

  In such a precision pipe, conventionally, the pipe has been cut not by cutting but by shearing in order to prevent generation of chips. That is, a pipe is cut by supporting a pipe with a die and feeding a single shearing blade linearly so that the cutting edge (cutting edge) passes through the entire outer diameter region of the pipe. (For example, refer to Patent Document 1 or 2).

Moreover, as a shearing blade used for cutting a pipe, for example, a flat plate-shaped parting blade having a cutting edge (cutting edge) formed at an end is known (for example, see Patent Document 3).
Japanese Patent Laid-Open No. 3-184623 (2nd page, Fig. 1 (c)) JP 2002-46094 A (Claim 3) JP 2001-179526 A (Claim 1, FIG. 1)

  Thus, the conventional method for cutting pipes has the following problems.

  That is, when a pipe is cut by a conventional pipe cutting method, a portion where the shearing blade (detailedly, the cutting edge of the shearing blade) is cut from the outer peripheral surface of the pipe to the inner peripheral surface at the cutting portion of the pipe. Inwardly, as the shearing blade advances, inward burrs are generated and inward shearing internal stress remains, but the shearing blade advances from the inner peripheral surface of the pipe to the outer peripheral surface at the cutting portion of the pipe. In the sheared part, outward burrs are generated as the shearing blade advances, and outward shearing internal stress remains.

  If outward burrs are generated in the pipe cutting part in this way, if the pipe is subjected to roll correction processing for bending correction, the outward burrs are scraped off by the correction roll during the correction processing. The burr is caught between the straightening roll and the pipe surface (outer peripheral surface), and as a result, the pipe surface may be damaged.

  In particular, when the pipe is a pipe that requires strict surface (outer peripheral surface) accuracy, such as that used for the photosensitive drum substrate, scratches on the surface of the pipe are fatal surface defects. The problem is that the yield of the product decreases.

  Further, when outward shearing internal stress remains in the pipe cut portion, the straightness of the pipe may be lowered. Further, when the pipe is used for the photosensitive drum base, for example, it is difficult to stably assemble the flange to the end portion of the photosensitive drum (that is, the cut portion of the pipe) due to the residual residual shearing internal stress. The problem occurs.

  The present invention has been made in view of the above-described technical background, and an object of the present invention is to cut a pipe that can be cut so that outward burrs are not generated in the cutting portion and no outward shearing internal stress remains. , Pipes with no outward burrs in the cut part and no outward shearing internal stress remaining, pipe straightening method that can prevent the pipe surface from being damaged by burrs during straightening, The object is to provide a pipe cutting device used in the cutting method, a pipe manufacturing method using the cutting method, and a pipe manufacturing device using the cutting device.

  The present invention provides the following means.

  [1] A method for cutting a pipe, characterized in that a shearing process is performed on the entire circumference of the pipe to send the shearing blade in the direction of advancing from the outer circumferential surface to the inner circumferential surface of each pipe in the circumferential direction.

  [2] The method for cutting a pipe according to item 1 above, wherein shearing is performed using a plurality of shearing blades arranged side by side in the circumferential direction of the pipe.

  [3] The pipe cutting method according to item 2, wherein shearing is sequentially performed using the plurality of shearing blades.

  [4] The pipe cutting method according to item 2, wherein shearing is simultaneously performed using the plurality of shearing blades.

  [5] The method for cutting a pipe according to item 1, wherein one shearing blade is used to rotate at least one of the shearing blade and the pipe in the circumferential direction of the pipe, and shearing is sequentially performed at each rotational position.

[6] Using a constraining die having a constraining hole for constraining a pipe,
Any of the preceding items 1 to 5 in which the pipe is constrained in a deformation-prevented state by bringing the peripheral surface of the constraining hole into contact with the peripheral surface of the pipe disposed in the constraining hole of the constraining die, and shearing is performed in this state. The pipe cutting method according to claim 1.

  [7] The pipe cutting method according to [6], wherein the constraining die is divided from a plurality of constraining die components.

  [8] The pipe cutting method according to item 6 or 7, wherein the constraining die is provided with a passage hole that extends in a feeding direction of the shearing blade and through which the shearing blade passes.

  [9] The constraining die is provided with a passage hole that extends in the feed direction of the shearing blade and through which the shearing blade passes, and the constraining die is divided into a plurality of constraining die constituent pieces and is constrained. 7. The pipe cutting method according to item 6 above, wherein a die dividing surface cuts through the passage hole.

  [10] The method for cutting a pipe according to 7 or 9 above, wherein a gap between the divided portions of the restraint hole is set to 0.1 mm or less in a state where the pipe is restrained by the restraining die, and shearing is performed in this state.

  [11] The pipe cutting method according to any one of items 1 to 10, wherein the cutting edge angle of the shearing blade is set to an acute angle.

  [12] The pipe is made of a drawing material having a mouth part at one end, and the shearing process is performed on the entire circumference in the vicinity of the mouth part of the pipe, thereby removing the mouth part of the pipe and / or performing the shearing process on the pipe. The pipe cutting method according to any one of 1 to 11 above, wherein the vicinity of the other end portion of the pipe is removed by performing the entire circumference of the other end portion.

  [13] The pipe cutting method according to any one of items 1 to 12, wherein the pipe is subjected to roll correction processing after cutting.

  [14] The pipe cutting method according to any one of items 1 to 13, wherein the pipe is for a photosensitive drum substrate.

  [15] A pipe cut by the pipe cutting method according to any one of 1 to 14 above.

  [16] A pipe straightening method characterized by performing roll straightening on the pipe cut by the pipe cutting method according to any one of the above items 1 to 14.

[17] A plurality of shearing blades arranged side by side in the circumferential direction of the pipe on the outside of the pipe to be cut, a feeding device that sends each shearing blade in a direction to advance from the outer peripheral surface of the pipe to the inner peripheral surface,
A pipe cutting device characterized by comprising:

  [18] One shearing blade disposed outside the pipe to be cut, a feeding device that feeds the shearing blade in a direction to advance from the outer peripheral surface of the pipe to the inner peripheral surface, and at least one of the shearing blade and the pipe And a rotating device for rotating the pipe in the circumferential direction of the pipe.

  [19] Furthermore, a restraint die having restraint holes for restraining the pipe is provided, and the restraint die is configured to bring the pipe into contact with the peripheral surface of the pipe disposed in the restraint hole. 19. The pipe cutting device according to 17 or 18 above, which is constrained to a deformation-prevented state.

  [20] The pipe cutting device according to [19], wherein the constraining die is divided from a plurality of constraining die components.

  [21] The pipe cutting device according to [19] or [20], wherein the constraining die is provided with a passage hole that extends in a feeding direction of the shearing blade and through which the shearing blade passes.

  [22] The constraining die is provided with a passage hole that extends in the feed direction of the shearing blade and through which the shearing blade passes, and the constraining die is divided into a plurality of constraining die constituent pieces and is constrained. 20. The pipe cutting device as described in 19 above, wherein a die dividing surface cuts through the passage hole.

  [23] The pipe cutting device according to [20] or [22], wherein the constraining die is configured such that a clearance between the split portions of the constraining holes is set to 0.1 mm or less in a state where the pipe is constrained.

  [24] The pipe cutting device according to any one of items 17 to 23, wherein the cutting edge angle of the shearing blade is set to an acute angle.

  [25] The pipe cutting device according to any one of the above items 17 to 24, which is used for cutting and removing the mouthpiece and / or the other end of a pipe made of a drawing material having a mouthpiece at one end.

  [26] The pipe cutting device according to any one of [17] to [25], wherein the pipe is subjected to roll correction processing after cutting.

  [27] The pipe cutting device according to any one of items 17 to 26, wherein the pipe is for a photosensitive drum substrate.

  [28] Manufacture of a pipe obtained by drawing, and after cutting and removing the mouthpiece part and / or the other end part of the raw pipe made of a drawing material having a mouthpiece part at one end part, the raw pipe is subjected to roll correction processing. A method for producing a pipe, characterized in that the mouthpiece portion and / or the other end portion of the element pipe are cut and removed by the pipe cutting method according to any one of the preceding items 1 to 14.

  [29] A cutting / removing device for an end portion of the raw tube, which cuts and removes the mouthpiece portion and / or the other end portion of the raw tube made of a drawing material having a mouthpiece portion at one end portion obtained by drawing, and the cutting A pipe manufacturing apparatus comprising: a roll straightening apparatus that performs roll straightening on an element pipe from which an end portion has been removed by a removing apparatus; The pipe according to any one of the preceding items 17 to 27, as the cutting and removing apparatus. An apparatus for producing a pipe, characterized in that a cutting device is used.

  The present invention has the following effects.

  In the invention of [1], cutting is performed in this cutting direction by performing shearing processing for sending the shearing blade in the direction in which the circumferential direction of the pipe advances from the outer peripheral surface of the pipe to the inner peripheral surface for the entire circumference of the pipe. In the cut portion of the pipe, no outward burrs are generated over the entire circumference, and no outward shearing internal stress remains. Therefore, it is possible to prevent the straightness of the pipe from being lowered due to the residual residual shearing internal stress, and if the pipe cut by this cutting method is subjected to roll straightening, it is caused by burr winding. Damage to the pipe surface (outer peripheral surface) can be prevented. In particular, when the pipe is for a photosensitive drum substrate, the yield of the product can be improved at the time of manufacturing the photosensitive drum, and the flange can be stably assembled to the end of the photosensitive drum.

  In the invention of [2], the pipe can be cut efficiently by performing shearing using a plurality of shearing blades arranged side by side in the circumferential direction of the pipe.

  In the invention of [3], a plurality of shearing blades arranged side by side in the circumferential direction of the pipe are used to sequentially perform the shearing process, thereby preventing a plurality of shearing blades from interfering with each other when the pipe is cut. So that the pipe can be cut reliably.

  In the invention of [4], by simultaneously performing shearing using a plurality of shearing blades arranged side by side in the circumferential direction of the pipe, the pipe cutting operation can be reliably and efficiently performed.

  In the invention of [5], the pipe can be cut using one shear blade. Therefore, the structure of the pipe cutting device can be simplified.

  In the invention of [6], the peripheral surface of the constraining hole is brought into contact with the peripheral surface of the pipe disposed in the constraining hole of the constraining die, so that the pipe receives a shearing force from the shearing blade during the shearing process and becomes flat. The pipe can be constrained to the deformation-prevented state so as not to be deformed. Therefore, it is possible to prevent deformation of the pipe that may occur during shearing.

  In the invention of [7], since the constraining die is divided from a plurality of constraining die constituent pieces, the pipe can be reliably and easily constrained.

  In the invention of [8], since the constraining die is provided with a passage hole extending in the feed direction of the shearing blade and through which the shearing blade passes, the periphery of the cutting scheduled portion of the peripheral surface of the pipe is constrained by the constraining die. Therefore, it is possible to reliably prevent the deformation of the pipe that may occur during the shearing process.

  In the invention of [9], the constraining die is provided with a passage hole through which the shearing blade extends in the feed direction of the shearing blade, so that the periphery of the cutting scheduled portion of the peripheral surface of the pipe is constrained by the constraining die. Therefore, it is possible to reliably prevent the deformation of the pipe that occurs during the shearing process. In addition, since the constraining die is divided from a plurality of constraining die components, the pipe can be constrained reliably and easily. Furthermore, since the dividing surface of the constraining die cuts the passage hole vertically, the passage hole is opened by disassembling the constraining die into a plurality of constituent pieces when replacing the shearing blade or cleaning the passage hole. Therefore, replacement of the shearing blade, cleaning of the passage hole, and the like can be easily performed.

  In the invention of [10], in the state where the pipe is constrained by the constraining die, the clearance between the divided portions of the constraining holes is set to 0.1 mm or less, and in this state, shearing is performed so that the cut portion of the pipe faces outward. Therefore, it is possible to reliably prevent the occurrence of defects.

  In the invention [11], since the cutting edge angle of the shearing blade is set to an acute angle, generation of chips during the shearing process can be reliably prevented. Therefore, if the pipe cut by this cutting method is subjected to roll straightening, not only can the surface of the pipe be damaged due to burrs, but also the surface of the pipe can be damaged due to chips. Can be prevented.

  In the invention of [12], the pipe cut portion obtained by cutting and removing the mouthpiece portion and the other end portion of the pipe has no outward burrs over its entire circumference, and the outward shearing interior There is no residual stress. Therefore, it is possible to prevent the straightness of the pipe from being lowered due to the residual residual shearing internal stress, and if the pipe cut by this cutting method is subjected to roll straightening, it is caused by burr winding. It is possible to prevent the pipe surface from being damaged. In particular, when the pipe is for a photosensitive drum substrate, the yield of the product can be improved at the time of manufacturing the photosensitive drum, and the flange can be stably assembled to the end of the photosensitive drum.

  In the invention of [13], even when roll correction processing is performed on the pipe after cutting the pipe, it is possible to prevent the pipe surface from being damaged by burr winding during the roll correction processing.

  In the invention of [14], by using the pipe cut by the pipe cutting method of the present invention for the photosensitive drum base, it is possible to improve the yield of the product at the time of manufacturing the photosensitive drum, and the end of the photosensitive drum. The flange can be assembled to the part stably.

  According to the invention of [15], it is possible to provide a pipe in which no outward burrs are generated in the cut portion and no outward shearing internal stress remains.

  In the invention of [16], it is possible to prevent the pipe surface from being damaged by burrs during roll correction processing. Therefore, a pipe having high surface accuracy can be provided.

  In the inventions [17] to [27], a pipe cutting device that can be suitably used in the pipe cutting method of the present invention can be provided.

  [28] In the invention of [28], by cutting and removing the mouthpiece portion and the other end portion of the raw tube by the pipe cutting method of the present invention, outward burrs are generated around the entire circumference of the cut portion of the raw tube. A defect can be prevented, and a defect in which an outward shearing internal stress remains can be prevented. Therefore, it is possible to prevent the straightness of the raw pipe from being lowered due to the residual residual shear internal stress. Then, by performing roll correction processing on the element tube, it is possible to prevent the surface of the element tube from being damaged by burr winding. Therefore, a pipe having high surface accuracy and high straightness can be obtained. Therefore, this pipe can be suitably used for a precision pipe that requires high surface accuracy and high straightness, such as a photosensitive drum base, a lens barrel of an optical device, and the like.

  In the invention [29], a pipe manufacturing apparatus that can be suitably used in the pipe manufacturing method of the present invention can be provided.

  Next, several embodiments of the present invention will be described below with reference to the drawings.

  1-5 is a figure for demonstrating the cutting method and correction method of the pipe which concern on 1st Embodiment of this invention.

  In this embodiment, the pipe obtained by sequentially passing through the pipe cutting method and the straightening method, i.e., the pipe obtained by the pipe manufacturing method, is used for precision pipes that require high surface accuracy and high straightness, More specifically, it is used for a substrate of a photosensitive drum such as an electronic copying machine or a laser printer.

  The pipe (1) shown in FIG. 1 is, for example, a base pipe of a pipe for a photosensitive drum base. This pipe (1) (element tube) is a round pipe (with a circular cross section), and is a long, non-cutting drawing made of aluminum (including an alloy thereof) drawn by a draw bench or the like. Made of material. A mouthpiece (2) is formed at one end (tip) of the pipe (1). In order to pass the end of the pipe (1) through the forming hole of the drawing die (not shown), the end of the pipe (1) is reduced in diameter (for example, swaging). ).

  In the present embodiment, the opening (2) (one end) of the pipe (1) (element tube) is cut and removed by the pipe cutting device (10A) shown in FIG. The other end of the base tube is also cut and removed by the pipe cutting device (10A) shown in FIG. Next, the pipe (1) is subjected to roll straightening by the roll straightening apparatus (30) shown in FIG. 5 to obtain a desired pipe, for example, a photosensitive drum base pipe. Therefore, the pipe cutting device (10A) shown in FIG. 1 also functions as a cutting and removing device for the end of the pipe (1) (element tube) in, for example, a photosensitive drum substrate pipe manufacturing apparatus.

  In the present invention, the pipe (1) (element tube) is not limited to the one made of aluminum, but may be made of another metal or other material. . The pipe (1) is not limited to a round pipe, and may be a square pipe or another cross-sectional shape.

  First, the configuration of the pipe cutting device (10A) will be described below with reference to the drawings.

  This pipe cutting device (10A) is a pipe press cutting device in detail. As shown in FIG. 1, a restraining die (11) for restraining the pipe (1) and two shearing blades (13). (13) and two feeding devices (15) and (15) for applying a driving force in the feeding direction to each shear blade (13).

  The constraining die (11) has a constraining hole (12) having a substantially circular cross section, and is divided into two upper and lower parts. That is, the constraining die (11) is composed of an upper constraining die component piece (11a) and a lower constraining die component piece (11b) as shown in FIGS. And this constraining die (11) inserts and arranges the pipe (1) in the constraining hole (12), and then combines the upper and lower constituent pieces (11a) and (11b) together to constrain the peripheral surface of the pipe (1). By pressing the entire circumference of the peripheral surface of the hole (12) in contact with the surface, the pipe (1) is not deformed into a flat shape due to the shearing force from the shearing blade (13) during shearing. The pipe (1) is constrained in a deformation-prevented state.

  The constraining die (11) is preferably configured as follows. That is, as shown in FIG. 4, in the state where the pipe (1) is restrained by the restraining die (11), the gap t between the divided portions (12S) of the restraining hole (12) is set to 0.1 mm or less. (That is, 0 mm ≦ t ≦ 0.1 mm) is desirable. In particular, the gap t is preferably set to 0 mm (that is, t = 0 mm). By setting the gap t in this way, it is possible to reliably prevent an outward burr from being generated at the cut portion of the pipe (1). In addition, when the outer diameter of the pipe (1) is in the range of 24 to 47 mm and the thickness of the pipe (1) is in the range of 0.7 to 1.0 mm, the gap t can be set in this way. Particularly desirable. In FIG. 4, the gap t is exaggerated for convenience of explanation.

  Moreover, as shown in FIG. 1, the upper restraint die component piece (11a) of the restraint die (11) is attached to the lifting device (17), and the upper restraint die (17) is operated to operate the upper restraint die (17). The die component piece (11a) moves up and down, so that the pipe (1) disposed in the restraint hole (12) can be restrained or the restrained pipe (1) can be released. Further, by raising the upper restraint die constituent piece (11a), the restraint die (11) is disassembled into an upper restraint die constituent piece (11a) and a lower restraint die constituent piece (11b).

  The two shearing blades (13) and (13) have the same shape, and are arranged at equal intervals in the circumferential direction of the pipe (1) outside the pipe (1) constrained by the constraining die (11). And are arranged so as to be movable in the feed direction. In this embodiment, the two shearing blades (13) and (13) are a pair of left and right disposed on the left and right sides of the pipe (1). That is, the two shearing blades (13) and (13) are composed of a left shearing blade disposed on the left side of the pipe (1) and a right shearing blade disposed on the right side of the pipe (1). The left shearing blade (13) cuts the left half circumference of the pipe (1), and the right shearing blade (13) cuts the right half circumference of the pipe (1).

  That is, the entire circumference of the pipe (1) is virtually divided into a plurality of cutting scheduled portions in the circumferential direction. In the present embodiment, the entire circumference of the pipe (1) is virtually divided into two scheduled cutting sections (a left half circumference part and a right half circumference part). Then, the left half periphery is cut by the left shearing blade (13) for the left half periphery which is one of the planned cutting portions of the pipe (1), and the other cutting schedule of the pipe (1) is also performed. The right half circumference is cut by performing a shearing process with the right shear blade (13) on the right half circumference which is a part.

  As shown in FIG. 2, each shearing blade (13) is a flat plate-shaped parting blade, and has a cutting edge (14) (cutting edge) only at one end. This blade edge (14) is composed of a single blade having a blade surface (14a) (rake face) formed only on one surface thereof. The cutting edge angle θ of the shearing blade (13) is set to an acute angle (that is, 0 ° <θ <90 °). In particular, the cutting edge angle θ is desirably set in a range of 40 to 50 °. If θ is less than 40 °, the life of the cutting edge (14) of the shearing blade (13) may be shortened. Thus, by setting the blade edge angle θ, it is possible to reliably prevent generation of chips during shearing. If chips are generated during shearing, the chips adhere to the surface (outer peripheral surface) of the pipe (1), and when the pipe (1) is subjected to roll correction processing, As a result of the powder being caught between the straightening roll and the pipe surface (outer peripheral surface), there arises a problem that the surface of the pipe (1) is damaged. Therefore, it is desirable not to generate chips as much as possible so that such problems do not occur.

  The shearing blade (13) has the cutting edge (14) (cutting edge) only at one end as described above, and the cutting edge is not formed over the entire circumference. Further, the shearing blade (13) is not rotated at the time of shearing, that is, it is not rotated but moved (sent) in the feeding direction and sheared.

  Examples of the material of the shearing blade (13) include tool steel, cemented carbide tool steel, ceramic and diamond.

  The feeding device (15) feeds each shearing blade (13) (more specifically, the cutting edge (14) of each shearing blade (13)) in a direction to advance from the outer peripheral surface of the pipe (1) to the inner peripheral surface. As a drive source for applying a driving force in the feed direction to the shear blade (13), a fluid pressure cylinder such as a hydraulic cylinder or a gas cylinder is provided. In this embodiment, the fluid pressure cylinder is a gas cylinder. This gas cylinder has a cylinder main body (15a) and a rod (15b) that is removably loaded into the cylinder main body (15a). A shearing blade (13) is fixedly attached to the tip of the rod (15b) via a fixture (16). The feeding device (15) is configured such that when the rod (15b) advances from the cylinder body (15a), the shearing blade (13) is linearly moved in the feeding direction, while the rod (15b) is moved to the cylinder body. By retreating into (15a), the shear blade (13) is linearly moved in the direction opposite to the feed direction.

  As shown in FIG. 4, the constraining die (11) is provided with a passage hole (18) extending in the feeding direction of the shearing blade (13) by the feeding device (15) and passing through the shearing blade (13). ing. The outlet of the passage hole (18) is provided facing the restricting hole (12), that is, provided in the axially intermediate portion of the peripheral surface of the restricting hole (12). Further, the dividing surface (11L) of the constraining die (11) extends to the constraining hole (12) through the passage hole (18).

  The configuration of the passage hole (18) will be described in detail below. As shown in FIG. 3A, the split surface (11L) of the upper restraint die component piece (11a) and the split surface (11L) of the lower restraint die component piece (11b) are included in the restraint die (11). The channel hole forming grooves (18a) and (18b) are provided so as to extend in the feeding direction of the shearing blade (13). Then, by combining the upper and lower component pieces (11a) and (11b) with each other, both the passage hole forming grooves (18a) and (18b) are matched with each other, and thereby the passage hole ( 18) is formed. On the other hand, by disassembling the constraining die (11) into upper and lower component pieces (11a) (11b), the passage hole (18) is divided into upper and lower passage hole forming grooves (18a) (18b). ) In the dividing surface (11L).

  In this pipe cutting device (10A), after the pipe (1) is restrained by the restraining die (11), one of the feeding devices (15) and (15) is operated to respond. By moving the shearing blade (13) in the feeding direction, the shearing blade (13) is located on the outer periphery of the pipe (1) in one of the two half-circumferential parts (two scheduled cutting parts) of the pipe (1). It is sent in a straight line in the direction of travel from the surface to the inner peripheral surface, whereby the half peripheral portion of the pipe (1) is cut. Next, the sent shearing blade (13) is extracted from the pipe (1). Next, by operating the other feeding device (15) and moving the corresponding shearing blade (13) in the feeding direction, the remaining half-circumferential part (remaining scheduled cutting part) of the pipe (1) is sheared ( 13) is sent linearly in the direction of traveling from the outer peripheral surface of the pipe (1) to the inner peripheral surface, whereby the remaining half-periphery of the pipe (1) is cut. Thus, the shearing process is sequentially performed on the entire circumference of the pipe (1), and the entire circumference of the pipe (1) is cut. Removed from 1). In addition, even when the cutting and removal planned portion of the pipe (1) is not the fitting portion (2) but the other end portion of the pipe (1), the other end portion is cut and removed by the same cutting method. .

  Next, the configuration of the pipe straightening device (30) will be described with reference to FIG.

  This roll straightening apparatus (30) is a so-called inclined roll type straightening apparatus conventionally used. That is, as a basic configuration of the roll straightening apparatus (30), the apparatus (30) includes straight rolls (31) arranged in a plurality of slanted states such as a zigzag or a drum shape. In this roll straightening apparatus (30), the pipe (1) is drawn between the plurality of straightening rolls (31) from one end thereof, and the pipe (1) is drawn by the action of the straightening roll (31). 1) A straightening device that straightens and straightens the pipe (1) while applying driven rotation.

  Next, a method for sequentially cutting and straightening the pipe (1) using the pipe cutting device (10A) and the roll straightening device (30) will be described below.

  First, as the pipe (1) (element tube), as described above, one made of a long uncut drawing material made of aluminum is prepared. At one end of the pipe (1), a mouthpiece (2) is formed.

  Next, as shown in FIGS. 3A and 3B, in order to remove the mouthpiece (2) of the pipe (1) from the pipe (1), the vicinity of the mouthpiece (2) of the pipe (1) is removed. It is inserted into the restraint hole (12) of the restraint die (11) of the pipe cutting device (10A). Then, the lifting device (17) is lowered, and the upper restraining die component piece (11a) and the lower restraining die component piece (11b) are combined with each other on the peripheral surface of the pipe (1) near the mouthpiece (2). The entire circumference of the restraining hole (12) of the restraining die (11) is pressed against the surface contact state, thereby restraining the pipe (1) to the deformation preventing state. In the present invention, in the state where the pipe (1) is constrained by the constraining die (11), the gap t (see FIG. 4) of each divided portion (12S) of the constraining hole (12) of the constraining die (11) is described above. Thus, it is desirable to set it to 0.1 mm or less (preferably 0 mm).

  Next, as shown in FIG. 3C, in a state where the pipe (1) is constrained, either one of the feeding devices (15) and (15) is operated to corresponding shear blade (13). Is moved in the feed direction. In the present embodiment, the left feeding device (15) of both feeding devices (15) and (15) is operated. By the operation of the left feed device (15), the left shearing blade (13) passes through the corresponding passage hole (18) of the restraining die (11), and the cutting edge (14) of the left shearing blade (13) is passed through the passage hole (18 ) Protrudes into the restraint hole (12). As a result, the left shear blade (13) (specifically, the blade tip (14) of the left shear blade (13)) advances from the outer peripheral surface of the pipe (1) to the inner peripheral surface of the left half periphery of the pipe (1). In this direction, the pipe (1) is fed linearly toward the axis of the pipe (1). As the left shear blade (13) is fed, the left half circumference of the pipe (1) is moved to the edge of the left shear blade (13) ( 14) It will be cut off. Then, when the entire left half of the pipe (1) is cut, the feeding of the left shearing blade (13) is stopped.

  Here, in the shearing process by the left shearing blade (13), the left shearing blade (13) is sent in the direction of traveling from the outer peripheral surface to the inner peripheral surface of the pipe (1), and thus is cut by the shearing process. As shown in FIG. 3-4 (c), an inward burr (3) is generated in the left half circumference of the pipe (1) as the left shearing blade (13) advances. It does not occur. Furthermore, although an inward shearing internal stress remains in the left half of the cut pipe (1), no outward shearing internal stress remains.

  Next, as shown in FIG. 3-4, the left shearing blade (13) is moved in the direction opposite to the feeding direction by the left feeding device (15), and the left shearing blade (13) is extracted from the pipe (1). To do.

  Next, as shown in FIG. 3-5, the right feeding device (15) is operated to move the right shearing blade (13) in the feeding direction. As a result, the right shear blade (13) passes through the corresponding passage hole (18) of the restraining die (11) and the cutting edge (14) of the right shear blade (13) passes from the outlet of the passage hole (18) to the restraining hole (12 ) Protrudes in. As a result, the right shear blade (13) (specifically, the cutting edge (14) of the right shear blade (13)) advances from the outer peripheral surface of the pipe (1) to the inner peripheral surface of the right half periphery of the pipe (1). In this direction, the pipe is fed linearly toward the axis of the pipe (1), and with the feeding of the right shearing blade (13), the right half circumference of the pipe (1) is moved to the cutting edge of the right shearing blade (13) ( 14) It will be cut off. Then, when the entire right half of the pipe (1) is cut, the feeding of the right shear blade (13) is stopped.

  Here, in the shearing process by the right shearing blade (13), the right shearing blade (13) advances from the outer peripheral surface of the pipe (1) to the inner peripheral surface in the same manner as the shearing process by the left shearing blade (13). As shown in FIG. 3-6 (c), the pipe (1) cut by the shearing process is inwardly moved along with the progress of the right shearing blade (13). Burr (3) occurs, but no outward burr occurs. Furthermore, inward shear internal stress remains in the right half of the cut pipe (1), but outward shear internal stress does not remain.

  As described above, by sequentially performing shearing using the two shearing blades (13) and (13) on the entire circumference of the pipe (1) in the vicinity of the mouthpiece (2), the mouthpiece (1) of the pipe (1) ( 2) Cut the entire circumference in the vicinity. By this cutting, the mouthpiece (2) of the pipe is removed.

  In the present invention, the cut portion of the pipe (1) cut by the left shear blade (13) (that is, the left half circumference portion) and the cut portion of the pipe (1) cut by the right shear blade (13) (that is, the right portion) The semi-circumferential part) may slightly overlap each other.

  Next, as shown in FIG. 3-6, the right shearing blade (13) is moved in the direction opposite to the feeding direction by the right feeding device (15), and the right shearing blade (13) is extracted from the pipe (1). To do.

  Next, by raising the lifting device (17) and raising the upper restraint die component piece (11a), restraint of the pipe (1) by the restraint die (11) is released, and thus the pipe (1) is restrained by the restraint die. (11) can be taken out.

  Next, the other end of the pipe (1) is cut and removed by the same cutting method as described above using the pipe cutting device (10A).

  In the cut portion of the pipe (1) cut in this way, no outward burrs are generated over the entire circumference, and no outward shearing internal stress remains. Therefore, it is possible to prevent the straightness of the pipe (1) from being lowered due to the residual residual shear internal stress.

  Next, the pipe (1) is straightened by correcting the bending by the roll straightening device (30). This correction method will be described below.

  That is, as shown in FIG. 5, by passing the pipe (1) from one end portion between the plurality of straightening rolls (31) of the roll straightening processing device (30), the pipe (1) is operated by the straightening roll (31). ) And straightening the pipe (1) while applying the driven rotation of the pipe (1). The straightened pipe (1) is sent forward. In this way, the roll straightening process is performed over the entire length of the pipe (1).

  At the time of this straightening process, since no outward burrs are generated around the entire circumference of the cut portion of the pipe (1) as described above, burrs are wound around the surface (outer peripheral surface) of the pipe (1). Will not be damaged. Therefore, the pipe (1) having high surface accuracy can be obtained. Furthermore, as described above, since the decrease in straightness of the pipe (1) due to the residual residual shearing internal stress is prevented, the pipe (1) having high straightness can be obtained.

  Therefore, by using the pipe (1) obtained by the correction processing in this way for the photosensitive drum base, it is possible to improve the yield of the product at the time of manufacturing the photosensitive drum. Further, as described above, no outward shearing internal stress remains in the cut portion of the pipe (1) over the entire circumference, so that the flange is stabilized at the end of the photosensitive drum when the photosensitive drum is manufactured. Can be assembled well.

  Note that an inward burr (3) is generated at the cut portion of the pipe (1), but the burr (3) is not in direct contact with the straightening roll (31). ) Is not scraped off by the straightening roll (31). Therefore, in the inward burrs (3), the pipe (1) surface is hardly damaged by the wrapping of the burrs (3).

  Thus, the pipe cutting device (10A) has the following advantages.

  That is, the pipe cutting device (10A) includes a pair of left and right shearing blades (13) and (13) arranged outside the pipe (1), so that the pipe (1) can be cut efficiently. be able to.

  Furthermore, since this pipe cutting device (10A) is designed to sequentially perform shearing with each shearing blade (13), the two shearing blades (13) and (13) are connected to each other when cutting the pipe (1). Will not interfere. Therefore, the pipe (1) can be cut reliably.

  Moreover, since this pipe cutting device (10A) includes a restraining die (11) for restraining the pipe (1), the pipe (1) receives a shearing force from the shearing blade (13) during the shearing process. The pipe (1) can be restrained by the restraining die (11) in a deformation preventing state so as not to be deformed into a flat shape. Therefore, deformation of the pipe (1) that may occur during shearing can be prevented.

  Further, since the constraining die (11) is divided into two constraining die constituent pieces (11a) and (11b), the pipe (1) can be constrained reliably and easily.

  Further, the constraining die (11) is provided with a passage hole (18) extending in the feeding direction of the shearing blade (13) and passing through the shearing blade (13) during the shearing process. The periphery of the cut portion of the peripheral surface can be restrained by the restraining die (11). Therefore, it is possible to reliably prevent the pipe (1) from being deformed during the shearing process.

  Furthermore, in this constraining die (11), the split surface (11L) cuts through the passage hole (18), so the constraining die (11) is disassembled when replacing the shearing blade (13) or cleaning the passage hole (18). By doing so, the passage hole (18) opens in the dividing surface (11L). Therefore, replacement of the shearing blade (13), cleaning of the passage hole (18), and the like can be easily performed.

  FIG. 6 is a diagram for explaining a pipe cutting method according to the second embodiment of the present invention.

  The pipe cutting device (10B) used in this pipe cutting method is arranged outside the pipe (1) restrained by the restraining die (11) and arranged at equal intervals in the circumferential direction of the pipe (1). And three shearing blades (13), (13) and (13). The three shear blades (13), (13) and (13) have the same shape. The three shear blades (13), (13), and (13) each cut the 1/3 circumference of the pipe (1). The restraining die (11) is divided into an upper restraining die constituent piece (11a) and a lower restraining die constituent piece (11b). In this pipe cutting device (10B), the dividing surface (11L) of the constraining die (11) does not extend so as to cut through the passage hole (18) through which the shearing blade (13) passes. Other configurations of the pipe cutting device (10B) are the same as those of the first embodiment.

  In the present embodiment, the entire circumference of the pipe (1) is virtually divided into three scheduled cutting portions in the circumferential direction, and the three shearing blades (13) (13) of the pipe cutting device (10C) shown in FIG. ), The entire circumference of the pipe (1) is cut and kissed by sequentially performing shearing with the corresponding shearing blade (13) on each 1/3 circumference (scheduled cutting part) of the pipe (1). Part (2) is removed.

  FIGS. 7-1 and FIGS. 7-2 are figures for demonstrating the cutting method of the pipe which concerns on 3rd Embodiment of this invention.

  As shown in FIG. 7A, the pipe cutting device (10C) used in this pipe cutting method is arranged outside the pipe (1) restrained by the restraining die (11) in the circumferential direction of the pipe (1). A pair of left and right shearing blades (13) and (13) arranged side by side are provided. The two shearing blades (13) and (13) have the same shape as the pipe cutting device (10A) of the first embodiment, and are respectively arranged on the left side of the pipe (1). It consists of a shear blade and a right shear blade arranged on the right side of the pipe (1). Each shearing blade (13) has a flat plate shape and has a cutting edge (14) (cutting edge) extending perpendicularly to the feeding direction at one end thereof. Further, in this pipe cutting device (10C), the dividing surface (11L) of the constraining die (11) extends longitudinally through the passage hole (18) through which the shearing blade (13) passes to the constraining hole (12). . Other configurations of the pipe cutting device (10C) are the same as those of the first embodiment.

  In the present embodiment, using the pair of left and right shearing blades (13) and (13) of the pipe cutting device (10C) shown in FIG. Are simultaneously performed to cut the pipe (1). This cutting method will be described below.

  That is, the pipe (1) is restrained by the restraining die (11). Next, the left shearing blade (13) and the right shearing blade (13) are simultaneously moved in the feed direction at the same speed. Due to the movement of both shear blades (13) and (13) in the feed direction, the left shear blade (13) and the right shear blade (13) pass through the corresponding passage holes (18) of the restraining die (1), respectively. Both cutting edges (14) project simultaneously from the outlet of the passage hole (18) into the restraining hole (12). As a result, the shaft of the pipe (1) is moved in the direction in which the left shearing blade (13) and the right shearing blade (13) (specifically, the blade tip (14)) advance from the outer peripheral surface to the inner peripheral surface of the pipe (1). They are sent straight to the heart at the same time. Then, as shown in FIG. 7-2, the entire left half circumference of the pipe (1) is cut by the left cutting blade (13), and the entire right half circumference of the pipe (1) is cut by the right shearing blade (13). Both shears when cut, i.e. when the cutting edges (14), (14) of both shear blades (13), (13) abut each other at the axial center of the pipe (1) or slightly overlap. Stop feeding blades (13) and (13). As a result, the entire circumference of the pipe (1) is cut, so that the mouthpiece (2) of the pipe (1) is removed.

  In this embodiment, since the shearing process is simultaneously performed using the two shearing blades (13) and (13) arranged outside the pipe (1), the cutting operation of the pipe (1) is performed more efficiently. be able to.

  FIGS. 8-1 to FIGS. 8-6 are views for explaining a pipe cutting method according to the fourth embodiment of the present invention.

  The pipe cutting device (10D) used in this pipe cutting method includes a restraining die for restraining the pipe (1). This constraining die has the same configuration as the constraining die (11) of the pipe cutting device (10A) of the first embodiment, and is not shown.

  Furthermore, this pipe cutting device (10D) includes one shear blade (13) disposed outside the pipe (1) restrained by the restraining die, and the pipe (1) and the shear blade (13). As a rotating device for rotating at least one of the pipes (1) in the circumferential direction, a pipe rotating device (19) for intermittently rotating the pipe (1) on its own axis is provided. This pipe rotating device (19) has a known rotating mechanism.

  The shearing blade (13) is a flat plate-shaped parting blade, and is arranged on the upper side of the pipe (1) with the cutting edge (14) of the shearing blade (13) facing downward. This shear blade (13) cuts the upper half circumference of the pipe (1).

  In this embodiment, one shearing blade (13) of the pipe cutting device (10D) shown in the figure is used to shear the upper half circumference of the pipe (1) once by the shearing blade (13). By doing so, the upper half of the pipe (1) is cut. Then, after the end of the first shearing process, the pipe (1) is rotated about its own axis by the pipe rotating device (19), whereby the lower half-circumferential portion which is the uncut portion in the circumferential direction of the pipe (1) is sheared (13 ). Next, the shearing process by the shearing blade (13) is performed once more at the rotational angle position of the pipe, and the upper half circumference portion which is an uncut portion of the pipe (1) is cut. By this two cutting operations, the entire circumference of the pipe (1) is cut. This cutting method will be described below.

  That is, as shown in FIG. 8A, the pipe rotating device (19) is mounted on the pipe (1), and the pipe (1) is restrained by the restraining die. Next, the shearing blade (13) is moved in the feeding direction (downward) by a feeding device (not shown). By the movement of the shearing blade (13), the shearing blade (13) (specifically, the cutting edge (14) of the shearing blade (13)) is moved from the outer peripheral surface of the pipe (1) to the upper half circumference of the pipe (1). It is sent linearly toward the axis of the pipe (1) in the direction of traveling to the peripheral surface. Then, as shown in FIG. 8-2, when the entire upper half of the pipe (1) is cut by the shearing blade (13), the feeding of the shearing blade (13) is stopped.

  Next, as shown in FIG. 8-3, the shearing blade (13) is moved in the direction opposite to the feeding direction, and the shearing blade (13) is extracted from the pipe (1). By this extraction operation, the shearing of the upper half portion of the pipe (1) by the shearing blade (13) is completed. In this shearing process, the lower half portion of the pipe (1) is naturally not cut yet, that is, an uncut portion.

  Next, the pipe (1) is rotated 180 ° (half rotation) about its own axis by the pipe rotating device (19). By rotating this pipe, as shown in FIG. 8-4, the uncut portion of the pipe (1) is positioned in the upper half circumference of the pipe (1) which is the cutting position by the shearing blade (13).

  Next, the shearing blade (13) is moved once more by the feeding device in the feeding direction (downward). By this movement of the shearing blade (13), the shearing blade (13) (specifically, the cutting edge (14) of the shearing blade (13)) is moved from the pipe (1) to the upper half-circumferential portion of the pipe (1). Is sent linearly toward the axial center of the pipe (1) in the direction of traveling from the outer peripheral surface to the inner peripheral surface. Then, as shown in FIG. 8-5, when the entire upper half of the pipe (1) is cut by the shearing blade (13), the feeding of the shearing blade (13) is stopped.

  Next, as shown in FIG. 8-6, the shearing blade (13) is moved in the direction opposite to the feeding direction, and the shearing blade (13) is extracted from the pipe (1).

  By the above two shearing processes, the entire circumference of the pipe (1) is cut, and thus the mouthpiece (2) of the pipe (1) is removed.

  In the cut portion of the pipe (1) cut in this way, no outward burrs are generated over the entire circumference, and no outward shearing internal stress remains.

  According to the pipe cutting device (10D) of the present embodiment, the pipe (1) can be cut by using one shear blade (13). Therefore, the structure of the cutting device (10D) can be simplified.

  In the pipe cutting device (10D), the pipe (1) is rotated on its own axis as a rotating device that rotates at least one of the pipe (1) and the shearing blade (13) in the circumferential direction of the pipe (1). Although the pipe rotating device (19) is provided, the present invention includes a shearing blade rotating device (not shown) that intermittently rotates the shearing blade (13) in the circumferential direction of the pipe (1) as the rotating device. May be. In this case, the upper half circumference of the pipe (1) is sheared by the shear blade (13), and then the shear blade (13) is rotated 180 ° in the circumferential direction of the pipe (1) by the shear blade rotating device. Then, the shearing process is performed on the lower half of the pipe (1) at the rotational position of the shearing blade. As a result, the entire circumference of the pipe (1) is cut, so that the mouthpiece (2) is removed.

  As mentioned above, although several embodiment of this invention was described, this invention is not limited to what was shown to the said embodiment, A setting change is variously possible.

  For example, in the pipe cutting device according to the present invention, the shearing blades (13) may be arranged on both upper and lower sides of the pipe (1). Further, the number of shear blades (13) arranged outside the pipe (1) in the circumferential direction of the pipe may be two, three, or four or more. There may be. Further, the number of divisions of the constraining die (11) may be two, three, or four or more.

  Next, specific examples of the present invention are shown below.

  A large number of round pipes (1) made of a drawn material having a mouthed part (2) at the end were prepared. These pipes (1) are all made of aluminum. Moreover, the outer diameter of these pipes (1) is set in the range of 24-47 mm, and the wall thickness is set in the range of 0.7-1.0 mm.

  Next, using the pipe cutting device (10A) of the first embodiment, the pipe (1) is restrained by the restraining die (11), and in this restrained state, the dividing portion (12S) of the restraining hole (12) is restrained. Various changes were made to the gap t (see FIG. 4), and the pipe (1) was cut according to the pipe cutting method of the first embodiment to remove the mouthpiece (2). And the cut part of each pipe (1) was observed with the naked eye. As a result, it was possible to prevent outward burrs from occurring at the cut portion of the pipe (1). In particular, when the gap t is 0.1 mm or less, generation of outward burrs can be reliably prevented. Furthermore, when the gap t was 0 mm, the generation of outward burrs could be prevented more reliably.

  Further, as the shearing blade (13) of the pipe cutting device (10A) of the first embodiment, those having an acute angle θ and a right angle (that is, θ = 90 °) were prepared. Subsequently, using each shear blade (13), the pipe (1) was cut | disconnected according to the cutting method of the pipe of the said 1st Embodiment, and the splicing part (2) was removed. And generation | occurrence | production of the chip at the time of this shearing process was investigated. As a result, when the cutting edge angle θ of the shearing blade (13) was an acute angle, no chips were generated during the shearing process. On the other hand, when the cutting edge angle θ is a right angle, a slight amount of spiral or thread-like chips may be generated during shearing. Therefore, it was confirmed that the generation of chips can be surely prevented by cutting the pipe using the shear blade (13) having an acute edge angle θ.

  In Table 1, in Examples 1 to 8, the pipe cutting device (10A) of the first embodiment is used, and the gap t of the divided portion (12S) of the restraining hole (12) of the restraining die (11) is set. While changing variously, cutting edge angle (theta) of the shear blade (13) was changed variously, and the pipe (1) was cut | disconnected according to the cutting method of the pipe of the said 1st Embodiment.

  On the other hand, in Comparative Example 1, the pipe was cut by a conventional cutting method. That is, the pipe was cut by supporting the pipe with a die and feeding a single shearing blade linearly so that the cutting edge passes through the entire outer diameter region of the pipe.

  Next, the cut portion of each pipe (1) was observed with the naked eye, and the occurrence of outward burrs was examined. In addition, the generation of chips was examined. The results are shown in Table 1.

  In Table 1, the meanings of the symbols in the “outward burrs” and “chip” columns are as follows.

[Outward burrs] column A: No burrs are generated.
○: Burr hardly occurs.
Δ: Small burrs occasionally occurred.
X: Large burrs frequently occurred.

[Chip] column A: There is no generation of chips.
○: Slightly generated chips.
X: A large amount of chips was generated.

  As shown in Table 1, when the gap t and the blade edge angle θ are set within a predetermined range, it is confirmed that outward burrs can be reliably prevented and chips can be reliably prevented. It was possible.

  The present invention relates to a method of cutting a pipe, a pipe correcting method, a pipe cutting device, a pipe manufacturing method, and a pipe manufacturing used in various applications including a photosensitive drum base, a lens barrel of an optical device (eg, camera). Available to the device.

1 is a perspective view of a pipe cutting device according to a first embodiment of the present invention. (A) is a top view of the shearing blade of the cutting device, and (b) is a front view of the shearing blade. (A) is the perspective view of the principal part of the cutting device which shows the state before restraining a pipe with the restraint die of the cutting device, (b) is the top view of the shearing blade in the cutting device of the state of (a) (C) is a front view of the shearing blade in the same cutting device of the state of (a). (A) is the perspective view of the principal part of the cutting device which shows the state which restricted the pipe with the restriction die of the cutting device, (b) is the top view of the shearing blade in the cutting device of the state of (a), ( c) is a sectional view taken along the line cc in FIG. (A) is the perspective view of the principal part of the cutting device which shows the state which cut | disconnected the left half periphery of the pipe with the left shearing blade of the cutting device, (b) is the shearing blade in the cutting device of the state of (a) (C) is the cc sectional view taken on the line in (b). (A) is the perspective view of the principal part of the cutting device which shows the state which extracted the left shearing blade of the cutting device from the pipe, (b) is the top view of the shearing blade in the cutting device of the state of (a), (C) is the cc sectional view taken on the line in (b). (A) is the perspective view of the principal part of the cutting device which shows the state which cut | disconnected the right half circumference part of the pipe with the right shearing blade of the cutting device, (b) is the shearing blade in the cutting device of the state of (a) (C) is the cc sectional view taken on the line in (b). (A) is the perspective view of the principal part of the cutting device which shows the state which extracted the right shearing blade of the cutting device from the pipe, (b) is the top view of the shearing blade in the cutting device of the state of (a), (C) is the cc sectional view taken on the line in (b). It is a front view of the principal part of the cutting device which shows the state where the pipe was restrained with the restriction die of the cutting device. It is a side view of a state in the middle of straightening a pipe using the pipe roll straightening apparatus according to the first embodiment of the present invention. It is a front view of the principal part of the cutting device showing the state where the pipe was restrained with the restraining die of the pipe cutting device concerning a 2nd embodiment of the present invention. It is a front view of the principal part of the cutting device which shows the state where the pipe was restrained with the restraining die of the pipe cutting device concerning a 3rd embodiment of the present invention. It is a front view of the principal part of the cutting device which shows the state where the pipe was sheared with the shearing blade of the cutting device. (A) The side view of the principal part of the cutting device which shows the state which attached the pipe to the cutting device of the pipe which concerns on 4th Embodiment of this invention, (b) is the bb sectional view taken on the line in (a). FIG. (A) is the side view of the principal part of the cutting device which shows the state which cut | disconnected the upper half circumference part of the pipe with the shearing blade of the cutting device, (b) is the bb sectional view taken on the line in (a). . (A) is the side view of the principal part of the cutting device which shows the state which extracted the shearing blade of the cutting device from the pipe, (b) is the bb sectional view taken on the line in (a). (A) is the side view of the principal part of the cutting device which shows the state which rotated the pipe with the pipe rotation apparatus of the cutting device, (b) is the bb sectional view taken on the line in (a). (A) is the side view of the principal part of the cutting apparatus which shows the state which cut | disconnected the upper half peripheral part (uncut part) of the pipe with the shearing blade of the cutting apparatus, (b) is bb in (a). It is line sectional drawing. (A) is the side view of the principal part of the cutting device which shows the state which extracted the shearing blade of the cutting device from the pipe, (b) is the bb sectional view taken on the line in (a).

Explanation of symbols

1 ... pipe
2 ... Mouth part 3 ... Inward burr
10A, 10B, 10C, 10D ... Pipe cutting device (cutting and removing device at the end of the raw tube)
11 ... Restraint die
11a… Upper restraint die component
11b ... Lower restraint die component
11L: Split surface
12 ... Restraining hole
12S: Dividing part
13 ... Shear blade
14 ... Blade
15 ... Feeding device
17 ... Lifting device
18 ... Passage hole
19 ... Pipe rotating device
30 ... Pipe roll straightening equipment
31 ... Straightening roll θ ... Cutting edge angle t ... Clearance

Claims (29)

  A method for cutting a pipe, characterized in that a shearing process is performed for each part in the circumferential direction of the pipe in a direction in which a shearing blade is advanced from the outer peripheral surface to the inner peripheral surface of the pipe.   The pipe cutting method according to claim 1, wherein shearing is performed using a plurality of shearing blades arranged side by side in the circumferential direction of the pipe.   The pipe cutting method according to claim 2, wherein shearing is sequentially performed using the plurality of shearing blades.   The pipe cutting method according to claim 2, wherein shearing is simultaneously performed using the plurality of shearing blades.   The pipe cutting method according to claim 1, wherein one shearing blade is used to rotate at least one of the shearing blade and the pipe in the circumferential direction of the pipe, and shearing is sequentially performed at each rotational position. Using a restraint die with restraint holes to restrain the pipe,
By bringing the peripheral surface of the restraint hole into contact with the peripheral surface of the pipe disposed in the restraint hole of the restraint die, the pipe is restrained in a deformation preventing state,
The pipe cutting method according to any one of claims 1 to 5, wherein shearing is performed in this state.   The pipe cutting method according to claim 6, wherein the constraining die is divided from a plurality of constraining die constituent pieces.   The pipe cutting method according to claim 6 or 7, wherein the constraining die is provided with a passage hole extending in a feeding direction of the shearing blade and through which the shearing blade passes. The constraining die is provided with a passage hole extending in the feeding direction of the shearing blade and through which the shearing blade passes,
The pipe cutting method according to claim 6, wherein the constraining die is divided from a plurality of constraining die constituent pieces, and a split surface of the constraining die vertically cuts the passage hole. In a state where the pipe is constrained by the constraining die, the gap of the constraining hole divided portion is set to 0.1 mm or less,
The pipe cutting method according to claim 7 or 9, wherein shearing is performed in this state.   The cutting method of the pipe according to any one of claims 1 to 10, wherein a cutting edge angle of the shearing blade is set to an acute angle. The pipe is made of a drawn material having a spout at one end,
The other end portion of the pipe is removed by removing the mouth portion of the pipe by performing shearing on the entire circumference in the vicinity of the mouth portion of the pipe, and / or by performing the shearing process on the entire circumference in the vicinity of the other end portion of the pipe. The pipe cutting method according to claim 1, wherein the pipe is removed.   The pipe cutting method according to any one of claims 1 to 12, wherein the pipe is subjected to roll straightening after cutting.   The pipe cutting method according to any one of claims 1 to 13, wherein the pipe is for a photosensitive drum substrate.   The pipe cut | disconnected by the cutting method of the pipe of any one of Claims 1-14.   The pipe straightening method characterized by performing roll correction | amendment processing about the pipe cut | disconnected by the cutting method of the pipe of any one of Claims 1-14. A plurality of shearing blades arranged side by side in the circumferential direction of the pipe outside the pipe to be cut;
A feeding device that sends each shear blade in a direction to advance from the outer peripheral surface of the pipe to the inner peripheral surface;
A pipe cutting device characterized by comprising: One shear blade arranged outside the pipe to be cut;
A feeding device that sends the shearing blade in a direction to advance from the outer peripheral surface of the pipe to the inner peripheral surface;
A rotating device that rotates at least one of the shearing blade and the pipe in the circumferential direction of the pipe;
A pipe cutting device characterized by comprising: Furthermore, a restraint die having restraint holes for restraining the pipe is provided,
The pipe cutting according to claim 17 or 18, wherein the restraining die restrains the pipe in a deformation-preventing state by bringing the circumferential surface of the restraining hole into contact with the circumferential surface of the pipe disposed in the restraining hole. apparatus.   The pipe cutting device according to claim 19, wherein the constraining die is divided from a plurality of constraining die constituent pieces.   The pipe cutting device according to claim 19 or 20, wherein the constraining die is provided with a passage hole extending in a feeding direction of the shearing blade and through which the shearing blade passes. The constraining die is provided with a passage hole extending in the feeding direction of the shearing blade and through which the shearing blade passes,
The pipe cutting device according to claim 19, wherein the constraining die is divided from a plurality of constraining die constituent pieces, and a split surface of the constraining die vertically cuts the passage hole.   23. The pipe cutting device according to claim 20 or 22, wherein the constraining die is configured such that a clearance between the split portions of the constraining holes is set to 0.1 mm or less in a state in which the pipe is constrained.   The pipe cutting device according to any one of claims 17 to 23, wherein a cutting edge angle of the shearing blade is set to an acute angle.   The pipe cutting device according to any one of claims 17 to 24, which is used for cutting and removing the splicing part and / or the other end part of a pipe made of a drawing material having a spigot part at one end part.   The pipe cutting device according to any one of claims 17 to 25, wherein the pipe is subjected to roll straightening after cutting.   The pipe cutting device according to any one of claims 17 to 26, wherein the pipe is for a photosensitive drum substrate. In the manufacturing method of a pipe obtained by cutting and removing the mouthpiece part and / or the other end part of the raw pipe made of a drawing material having a mouthpiece part at one end obtained by drawing, and then subjecting the raw pipe to roll correction processing,
The pipe manufacturing method according to any one of claims 1 to 14, wherein the opening portion and / or the other end portion of the raw pipe are cut and removed by the pipe cutting method according to any one of claims 1 to 14. An apparatus for cutting and removing the end portion of the raw tube, which is obtained by drawing and cuts and removes the mouthpiece portion and / or the other end portion of the raw tube made of a drawing material having a mouthpiece portion at one end portion;
A roll straightening device that performs a roll straightening process on the element tube from which the end has been removed by the cutting and removing device;
In a pipe manufacturing apparatus comprising:
The pipe cutting apparatus according to any one of claims 17 to 27, wherein the pipe cutting apparatus according to any one of claims 17 to 27 is used.

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