JP5362345B2 - Method for producing aluminum tube for photosensitive drum substrate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of facilitating production of aluminum tube for photoreceptor drum substrate which is superior in surface quality, with very few protrusive defects. <P>SOLUTION: In the method of producing aluminum tube for photoreceptor drum substrate, the aluminum tube for photoreceptor drum substrate is produced by drawing an extruded stock tube P1. As a pretreatment for drawing processing, the extruded stock tube is relatively moved in the axial direction, relative to a rotatably supported drum-like roller 2; the circumferential surface of the drum-like roller 2 is linearly brought into sliding contact with the outer circumferential surface of the extruded stock tube P1, in an oblique direction with respect to the axial line O of the extruded stock tube P1; and thereby, the protrusive defects on the outer circumferential surface of the extruded stock tube P1 are removed. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a method for producing an aluminum tube for a photosensitive drum substrate used for an OPC photosensitive drum substrate of an electrophotographic apparatus such as a copying machine, a printer, a facsimile machine or the like.

  In this specification and claims, the term “aluminum” is used to include aluminum and its alloys.

  Aluminum tubes used as the base of photosensitive drums in electrophotographic devices such as copiers, printers, and facsimile machines need to have a uniform OPC (organic photoconductor) coating on the surface, so the surface condition is close to a mirror surface. It is required to be.

  Conventionally, mirror finishing was performed by cutting an aluminum tube, but there was a problem that adjustment and management of cutting tools were not easy and skill was required for work, so it was not suitable for mass production. .

  In recent years, therefore, non-cutting pipes such as DI pipes made by squeezing aluminum rolled sheets, EI pipes made by squeezing aluminum extruded base pipes, and ED pipes made by drawing aluminum extruded base pipes are often used as substrates for photosensitive drums. It is getting to be. Above all, ED pipes, unlike other non-cut pipes, are suitable for mass production because 10 or more pipes can be produced in one process (two drawing processes), corresponding to the mass consumption associated with market expansion. It is attracting attention as something to gain.

  In general, an ED pipe is obtained by extruding an aluminum billet to obtain an aluminum extruded element pipe, then cutting the extruded element pipe into a predetermined length and drawing it to obtain an outer diameter, an inner diameter, and a wall thickness of the pipe wall. An aluminum tube having a predetermined thickness is obtained, then cut, chamfered at the end, and washed in order, and further manufactured through inspection of dimensions and appearance.

  The photosensitive drum substrate comprising the ED tube is required to have a high degree of surface smoothness and dimensional accuracy. However, since it is a non-cutting process, a minute amount adhered to the surface (detailed outer peripheral surface). It has fine surface defects such as flaky surface defects caused by flattening of aluminum strips, streak defects caused by extrusion die lines, and oil pits caused by pushing of lubricating oil during drawing. Yes.

  In particular, the scaly surface defects were easily raised due to the influence of heat during ultrasonic cleaning or OPC coating, and were easily converted into a crust-like convex defect. If such a ridge-like convex defect exists on the outer peripheral surface of the photosensitive drum substrate, there is a problem that when the photosensitive drum is configured and uniformly charged, it becomes a starting point of leakage (leakage) and the image is likely to deteriorate. It was.

  As a technique for preventing the occurrence of such a crust-like convex defect, by defining the roughness of the bearing portion of the extrusion die, adhesion of a minute aluminum piece on the surface of the extruded element tube causing the crust-like convex defect ( A method for suppressing the occurrence) is known (see Patent Document 1).

  In addition, there is a method for preventing the occurrence of crust-like convex defects by scraping and removing minute aluminum pieces adhering to the surface of the extruded aluminum tube with a soft rubbing member before drawing. It is known (see Patent Document 2). Further, a method is known in which the surface of the ED tube is wiped with a cloth, paper, sponge or polishing tape to break off and remove the crust-like convex defects on the surface of the ED tube (see Patent Document 3).

On the other hand, as a method for removing scratches, oxide films, foreign matters and the like on the surface of a bar or wire, a method of cutting the surface with a peeling die is also known (see Patent Documents 4 to 6).
JP-A-8-267122 JP 2006-159288 A JP-A-8-82939 Japanese Patent Laid-Open No. 9-155634 Japanese Patent Laid-Open No. 11-10444 JP 2002-219614 A

  However, according to the method described in the above-mentioned Patent Document 1, it is possible to suppress the occurrence of the crust-like convex defect on the surface of the ED tube, but it is possible to reliably prevent the occurrence of the crust-like convex defect. Not in. Further, in the methods described in Patent Document 2 and Patent Document 3, it is easy to remove aluminum pieces and foreign matters attached to the outer peripheral surface of the extruded element tube and the photosensitive drum base after drawing, but the aluminum piece is a tube material. It was difficult to remove the product integrated with the.

  In Patent Document 3, it is said that the crust-like convex defect is caused by inhomogeneous part, crystallized substance, and unevenly distributed substance, so that it easily breaks. However, according to the cross-sectional observation of the root part of the cassava, In particular, it has been found that many convex defects are generated even from a normal part, and the convex part rises further due to catching when such a convex defect is wiped off with cloth or paper, resulting in a larger defect. In addition, when polishing is performed using a polishing tape, scaly surface defects can be removed, but burr-like protrusion defects are newly generated by rubbing abrasive grains, which causes leakage (leakage).

  Furthermore, the method of cutting the surface with a skinning die as in Patent Documents 4 to 6 is difficult to apply to an extruded element tube for a photosensitive drum substrate that requires both dimensional accuracy and surface smoothness. That is, in these methods, the surface layer is removed and a new surface is exposed. Therefore, when applied to an extruded element tube, the reduction in the wall thickness impairs the uniformity of drawing reduction, leading to a reduction in dimensional accuracy. Since the chips produced by cutting are caught between the drawing dies and seized, the surface after drawing becomes rough.

  The present invention has been made in view of such a technical background, and an object of the present invention is to provide a method for easily producing an aluminum tube for a photosensitive drum substrate having excellent surface quality with very few sacrificial convex defects. To do.

  The present invention provides the following means.

[1] A method for producing an aluminum tube for a photosensitive drum substrate by drawing an extruded tube,
As a pretreatment of the drawing process, the extruded element pipe is moved in the axial direction of the element pipe relative to the drum-shaped roll supported so as to be able to rotate, and the peripheral surface of the roll is placed on the outer peripheral surface of the extruded element pipe. A method for producing an aluminum tube for a photosensitive drum substrate, wherein convex defects on the outer peripheral surface of the extruded element tube are removed by sliding in a line in an oblique direction with respect to the axis of the tube.

  [2] The photosensitive drum substrate according to item 1 above, wherein the convex defect is removed by the roll at a position before the extruded element pipe enters the drawing die with respect to the extruded element pipe that moves in the axial direction along with the drawing process. Of manufacturing aluminum pipes for use.

[3] A blade portion continuous in the axial direction of the roll is formed on the peripheral surface of the roll,
3. The photosensitive material according to item 1 or 2 above, wherein the convex portion is scraped with the blade portion by sliding the blade portion of the roll linearly in an oblique direction with respect to the axis of the extruded raw tube on the outer peripheral surface of the extruded raw tube. A method for producing an aluminum tube for a drum base.

[4] The peripheral surface of the roll is provided with a convex strip or a concave strip continuous in the axial direction of the roll,
4. The method for producing an aluminum tube for a photosensitive drum substrate according to item 3 above, wherein the blade edge of the blade portion is formed from a side edge of the convex or concave portion of the roll.

  [5] The method for producing an aluminum tube for a photosensitive drum substrate according to item 3 or 4, wherein a rake angle of the blade portion of the roll with respect to the outer peripheral surface of the extruded element tube is set in a range of −45 ° to 0 °.

  [6] The roll according to any one of the preceding items 1 to 5, wherein the roll is driven to rotate so that a portion of the peripheral surface facing the extrusion element pipe moves in a direction opposite to the movement direction of the extrusion element pipe. A method for producing an aluminum tube for a photosensitive drum substrate as described in 1 above.

  [7] The aluminum for a photosensitive drum substrate according to any one of [1] to [6], wherein the roll is driven to revolve around the extruded element tube relative to the extruded element tube around the extruded element tube. A method of manufacturing a tube.

  [8] The method for producing an aluminum tube for a photosensitive drum substrate according to any one of the above items 1 to 7, wherein a plurality of the rolls are arranged around the extruded element tube.

  [9] The method for producing an aluminum tube for a photosensitive drum substrate according to the above item 8, wherein each of the rolls is replaceable.

  [10] The preceding item 1 in which the scraps are removed from the outer peripheral surface of the extruded element tube by bringing a brush-like material or a porous soft material into sliding contact with the outer peripheral surface of the extruded element tube after removal of the convex defects by the roll. The manufacturing method of the aluminum tube for photosensitive drum base | substrates of any one of -9.

  [11] In any one of the preceding items 1 to 10, the removal waste is removed from the outer peripheral surface of the extruded element pipe by pouring a drawing oil on the outer peripheral surface of the extruded element pipe after the removal of the convex defect by the roll. The manufacturing method of the aluminum tube for photosensitive drum base | substrate of description.

[12] An apparatus for producing an aluminum tube for a photosensitive drum substrate, which produces an aluminum tube for a photosensitive drum substrate by drawing an extruded element tube,
Equipped with a drum-shaped roll for pretreatment of drawing,
The roll is supported so as to be capable of rotating, and the peripheral surface of the roll is lined in an oblique direction with respect to the axis of the extruded raw pipe on the outer peripheral face of the extruded raw pipe that moves in the axial direction relative to the roll. An apparatus for producing an aluminum tube for a photosensitive drum substrate, characterized by removing convex defects on the outer peripheral surface of the extruded element tube by sliding in contact with each other.

  [13] The roll is disposed at a position before the extruded raw tube enters the drawing die, and removes convex defects from the extruded raw tube that moves in the axial direction along with the drawing process. 13. An apparatus for producing an aluminum tube for a photosensitive drum substrate according to item 12 above.

[14] A blade portion continuous in the axial direction of the roll is formed on the circumferential surface of the roll,
The roll according to the preceding item 12, in which a convex defect is scraped off at the blade portion by causing the blade portion of the roll to slide in a line in an oblique direction with respect to the axis of the extrusion tube on the outer peripheral surface of the extruded tube. Or an apparatus for producing an aluminum tube for a photosensitive drum substrate according to 13.

[15] A first removal waste removing device disposed between the roll and the drawing die in the movement direction of the extruded element tube,
The first removal waste removing device has a brush-like material or a porous soft material, and the brush-like material or the porous soft material is placed on the outer peripheral surface of the extruded element tube after the removal of the convex defects by the roll. 15. The apparatus for producing an aluminum tube for a photosensitive drum substrate according to any one of 12 to 14 above, wherein the removal waste is removed from the outer peripheral surface of the extruded element tube by sliding contact.

[16] comprising a second removal waste removing device disposed between the roll and the drawing die in the moving direction of the extruded element tube,
The second removal waste removal device has a drawing oil pouring device, and is removed by pouring the drawing oil by the drawing oil pouring device onto the outer peripheral surface of the extruded element tube after the removal of the convex defects by the roll. 16. The apparatus for producing an aluminum tube for a photosensitive drum substrate according to any one of 12 to 15 above, wherein the scrap is excluded from the outer peripheral surface of the extruded element tube.

  The present invention has the following effects.

  In the invention of [1], since the peripheral surface of the drum-shaped roll is brought into sliding contact with the outer peripheral surface of the extruded raw tube that moves in the axial direction relative to the drum-shaped roll as a pretreatment of the drawing process, The surface layer of the outer peripheral surface is not cut and removed like skinning, but removes convex defects protruding from the outer peripheral surface such as protrusions and burrs integrated with the tube material, and deposits such as chips and metal flaws. be able to.

  Furthermore, since the circumferential surface of the roll is linearly slidably contacted with the outer circumferential surface of the extruded element tube in a line obliquely with respect to the axis of the extruded elementary pipe, It can be brought into contact with the outer peripheral surface of the extruded element tube, and furthermore, the force for rubbing the outer peripheral surface of the extruded element tube is applied to the convex defect in an oblique direction with respect to the axis of the extruded element tube. It is possible to scrape (i.e., remove) from the outer peripheral surface of the raw tube.

  Therefore, the extruded tube after this pretreatment has a very smooth outer peripheral surface while maintaining the original thickness. Therefore, by performing drawing, a photosensitive material with excellent dimensional accuracy and surface smoothness is obtained. An aluminum tube for a drum substrate can be manufactured. And, such an aluminum tube is constituted by using this as a base material because, for example, generation of a rust-like convex defect is prevented even if ultrasonic irradiation for cleaning or heating during OPC coating is performed. Leakage is less likely to occur when the photosensitive drum is uniformly charged.

  In the invention of [2], the convex defect is removed by the roll just before the extruded element tube being drawn enters the drawing die, so it is consistently inline from the pretreatment by the roll to the drawing process by the drawing die. This can be carried out continuously, and the production efficiency of the aluminum tube for the photosensitive drum substrate is increased, and the space efficiency in the production plant is improved (equipment space can be reduced).

  In the invention of [3], the convex defect is scraped off by the blade portion by sliding the blade portion of the roll linearly in an oblique direction with respect to the axis of the extrusion tube on the outer peripheral surface of the extruded raw tube. The convex defect can be reliably removed.

  In invention of [4], a blade part can be easily formed in the surrounding surface of a roll.

  In the invention of [5], since the rake angle of the roll blade portion with respect to the outer peripheral surface of the extruded raw tube is set in a range of −45 ° to 0 °, the blade portion of the roll seems to bite into the outer peripheral surface of the extruded raw tube. Therefore, it is possible to reliably prevent the surface layer on the outer peripheral surface of the extruded element tube from being removed by cutting.

  In the invention of [6], the roll is driven to rotate so that the portion of the peripheral surface facing the extruded element tube moves in the opposite direction to the moving direction of the extruded element tube. It can be removed reliably.

  In the invention of [7], the roll is driven to revolve around the extruded element tube relative to the extruded element pipe around the extruded element tube. It can be removed over the circumference.

  In the invention of [8], since a plurality of rolls are arranged around the extruded raw tube, the time required for removing the convex defects can be shortened.

  In the invention of [9], since each roll can be exchanged, the roll can be exchanged for one corresponding to the diameter of the extruded tube, and the roll can be used when the peripheral surface of the roll is worn or damaged. Can be replaced with a new one.

  In the invention of [10], since the brush-like product or the porous soft material is brought into sliding contact with the outer peripheral surface of the extruded element tube after the removal of the convex defects by the roll, the strips and powder particles removed by the roll Such removal waste can be easily removed from the outer peripheral surface of the extruded element tube, and the removal waste can be prevented from entering between the extrusion element tube and the drawing die to cause seizure.

  In the invention of [11], the removal oil such as fine particles and powder particles removed by the roll is drawn by pouring the drawing oil onto the outer peripheral surface of the extruded element tube after the removal of the convex defects by the roll. It can be easily removed from the outer peripheral surface of the extruded element tube, and the removal waste can be prevented from entering between the extruded element tube and the drawing die and causing seizure.

  In the inventions [12] to [16], the photosensitive drum substrate suitably used in the method for producing an aluminum tube for a photosensitive drum substrate according to the inventions [1] to [3], [10] and [11], respectively. An apparatus for manufacturing an aluminum tube can be provided.

  A method for producing an aluminum tube for a photosensitive drum substrate according to an embodiment of the present invention will be specifically described with reference to the drawings.

  FIG. 1 is a plan view showing a drawing process and a pretreatment process in the method for producing an aluminum tube for a photosensitive drum substrate according to this embodiment. In FIG. 1, K is an apparatus for manufacturing an aluminum tube for a photosensitive drum substrate used in the manufacturing method of this embodiment. The apparatus K includes a removal device 1, a first removal waste removal device 10, a second removal waste removal device 15, a die box 20, and the like. P1 is an extruded element tube made of aluminum. In addition, although the removal apparatus 1, the 1st removal waste removal apparatus 10, the 2nd removal waste removal apparatus 15, and the dice box 20 are installed and fixed via the installation bolt on the mount which abbreviate | omitted illustration, in FIG. The illustration of each fixing portion is also omitted.

  As shown in FIG. 1, the extruded pipe P1 has an annular cross section, and is drawn by passing through a drawing die 21 in the die box 20 in the direction of the arrow a to reduce the diameter and reduce the thickness. Although it becomes the pipe P2, before entering the drawing die 21, it is pre-processed inline through the removal device 1, the second removal waste removal device 15, and the first removal waste removal device 10 in order. That is, the extrusion element pipe P1 enters the drawing die 21 through the removal device 1, the second removal waste removal device 15, and the first removal waste removal device 10 in this order, whereby the photosensitive drum base aluminum composed of the removal tube P2. A tube is manufactured. In addition, the arrow a is the drawing | extracting direction (movement direction) of the extrusion element pipe P1, and this direction a corresponds with the axial direction of the extrusion element pipe P1.

  The diameter of the extruded tube is, for example, in the range of 15 to 50 mm, and the thickness thereof is, for example, in the range of 1.0 to 2.0 mm.

  As shown in FIGS. 1 to 3, the removing device 1 is arranged to be separated from the drawing die 21 in the die box 20 on the upstream side in the drawing direction a, and is used as a pretreatment for drawing processing. A plurality of drum-shaped rolls 2 for removing convex defects (not shown) on the outer peripheral surface of the raw tube P1 are provided. Each roll 2 is formed by integrating protrusion defects such as protrusions and burrs formed integrally with the pipe material on the outer peripheral surface of the extruded raw pipe P1, and deposits such as chips and metal flaws on the outer circumference of the extruded raw pipe P1. It is scraped off from the surface.

  As shown in FIG. 2, the plurality of rolls 2 are arranged so as to surround the extruded element pipe P1 around the extruded element pipe P1 and are spaced apart in the circumferential direction of the extruded element pipe P1. In the present embodiment, the number of rolls 2 is two. Accordingly, the two rolls 2 and 2 are arranged on both sides of the extrusion element pipe P1 around the extrusion element pipe P1. The arrangement positions of both rolls 2 and 2 are fixed. Both rolls 2 and 2 have the same configuration.

  The roll 2 has a drum shape. More specifically, the roll 2 has a shape in which the diameter of the roll 2 gradually increases from the center to both ends of the roll 2, and is a so-called reverse crown roll. is there.

  The diameter of the central part of the roll 2 is set in a range of 30 to 50 mm, for example. The diameter of each end of the roll 2 is set in a range of 50 to 80 mm, for example.

  As shown in FIG. 3, the axis of the roll 2 is arranged at a twisted position with respect to the axis O of the extruded element tube P1, and more specifically, the axis of the roll 2 is relative to the axis O of the extruded element tube P1. It is arranged in an oblique direction. Further, as shown in FIGS. 2 and 3, the region from the central portion of the peripheral surface of the roll 2 to the vicinity of both end portions is formed in a substantially elliptical cross section, whereby the region of the peripheral surface of the roll 2 is The outer peripheral surface of the extruded element tube P1 is linearly contacted in an oblique direction with respect to the axis O of the extruded element tube P1. In FIG. 3, 6 is a contact portion (that is, a sliding contact portion) between the peripheral surface of the roll 2 and the outer peripheral surface of the extruded element pipe P1. The contact portion 6 is linearly continuous in an oblique direction with respect to the axis O of the extruded element pipe P1 on the outer peripheral surface of the extruded element pipe P1. On the other hand, as shown in FIG. 2, both end portions on the peripheral surface of the roll 2 are not in contact with the outer peripheral surface of the extruded element pipe P <b> 1. The outer peripheral surface of the extruded element pipe P1 is prevented from being damaged by contacting the outer peripheral surface of the extruded element pipe P1.

  Further, as shown in FIG. 3, the axes of the two rolls 2 and 2 are inclined in opposite directions, that is, are arranged at twisted positions.

  On the peripheral surface of the roll 2, a plurality of ridges 3 that are continuous in the axial direction of the roll 2 are integrally formed at regular intervals in the circumferential direction of the roll 2. The number of ridges 3 is, for example, 6 to 16. In this embodiment, if it explains in full detail, the protruding item | line part 3 is following along the intersection line of the plane containing the axis line of the roll 2, and the surrounding surface of the roll 2. As shown in FIG. Moreover, the cross-sectional shape of the protruding item | line part 3 is a substantially trapezoid shape. The protruding height of the ridge portion 3 is set in a range of 0.5 to 3.0 mm, for example. The width | variety of the protruding item | line part 3 is set to the range of 2-5 mm, for example. The ridge portion 3 is a portion for forming the blade portion 5 on the peripheral surface of the roll 2.

  Furthermore, one side edge of the both side edges of each convex strip 3 of the roll 2 is formed so as to function as the cutting edge 5a of the blade 5 that scrapes off the convex defect on the outer peripheral surface of the extruded material P1. Therefore, the blade edge 5a of the blade portion 5 is formed from the side edge of each ridge portion 3, and is integrally formed continuously on the peripheral surface of the roll 2 in the axial direction of the roll 2. When the part 5 is in sliding contact with the outer peripheral surface of the extruded material P1, the convex defects are scraped off to remove the convex defects from the outer peripheral surface of the extruded material. Note that the side edge of the ridge portion 3 is a side edge between the top surface of the ridge portion 3 and the side surface of the ridge portion 3 in detail.

  As shown in FIG. 4, the roll 2 is attached to a rotation driving device 8 that rotates the roll 2 around its axis. That is, the roll 2 is supported by the rotation support shaft 8a of the rotation driving device 8 arranged along the axis so as to be driven to rotate. As a result, the roll 2 is driven to rotate about its axis by the driving force from the rotation support shaft 8a, that is, to rotate. The rotation support shaft 8a is connected to a drive motor (not shown) that drives the rotation support shaft 8a to rotate. An arrow e is the direction of rotation of the roll 2.

  As shown in FIG. 1, the rotation direction e of the roll 2 is such that the portion of the peripheral surface of the roll 2 facing the extrusion element pipe P1 side moves in the opposite direction to the movement direction of the extrusion element pipe P1 (drawing direction a). Direction.

  Furthermore, the roll 2 is attached to a revolving drive device (not shown) that drives the roll 2 to revolve around the extruded raw pipe P1 around the extruded raw pipe P1 (specifically, its axis O). Then, as shown in FIG. 2, the roll 2 is an extruded element pipe centering on the extruded element pipe p <b> 1 with its peripheral surface kept in sliding contact with the outer peripheral surface of the extruded element pipe P <b> 1. Revolving around P1. In FIG. 2, the arrow c is the revolution direction of the roll 2.

  In the present invention, the roll 2 may be driven to rotate around the axis O instead of the roll 2 being driven to revolve.

  Further, as shown in FIG. 4, a pair of holding rods 8b and 8b for rotatably holding the rotary spindle 8a are attached to both ends of the rotary spindle 8a. Each holding rod 8b is attached with an elastic member 8c made of a compression coil spring. The elastic member 8c is for pressing the peripheral surface of the roll 2 against the outer peripheral surface of the extruded element pipe P1 by its elastic restoring force. The peripheral surface of the roll 2 is always pressed against the outer peripheral surface of the extruded element pipe P1 by the elastic restoring force of the elastic member 8c.

  The degree of pressing of the peripheral surface of the roll 2 with respect to the outer peripheral surface of the extruded element pipe P1 can be set freely by adjusting the spring pressure of the elastic member 8c. In the present invention, the elastic member 8c may be made of a gas spring, rubber or the like in addition to the compression coil spring.

  The roll 2 is detachably attached to the rotation driving device 8 and the revolution driving device. Therefore, when the peripheral surface of the roll 2 (the blade portion in detail) is worn or damaged, the roll 2 is removed from the rotation driving device 8 and the revolution driving device, and the roll 2 can be easily replaced with a new one. Can do. Furthermore, the roll 2 can be replaced with one corresponding to the diameter of the extruded raw pipe P1.

  The roll 2 preferably has a Hv hardness of 70 or more on the peripheral surface of the roll 2 in order to reliably remove the convex defects integrated with the aluminum tube material. As the extruded element pipe P1, an Al-Mn alloy, an Al-Mg alloy, an Al-Mg-Si alloy, pure Al, or the like is preferably used.

  When removing the convex defect on the outer peripheral surface of the extruded element pipe P1 by the removing device 1, the extruded element pipe P1 is drawn by the drawing die 21 so that the extruded element pipe P1 is in its axial direction (that is, the drawing direction). Move to a) at a predetermined speed. Extrusion is performed in a state where the peripheral surface of the roll 2 that is driven to rotate on the outer peripheral surface of the extruded raw pipe P1 is linearly slid in an oblique direction with respect to the axis O of the extruded raw pipe P1. The periphery of the extruded material P1 is driven to revolve around the material P1. Thereby, the convex defect of the outer peripheral surface of the extrusion element pipe P1 can be scraped off with the peripheral surface of the roll 2, and a convex defect can be removed from the outer peripheral surface of the extrusion element tube P1.

  In this removal method, the circumferential surface of the roll 2 can be brought into contact with the outer circumferential surface of the extruded element tube P1 in a long circumferential region on the outer circumferential surface of the extruded element tube P1, and the outer circumferential surface of the extruded element tube is rubbed. Since the force is applied to the convex defect in an oblique direction with respect to the axis O of the extruded element tube P1, the convex defect can be effectively removed.

  Further, a blade portion 5 that is continuous in the axial direction is formed on the peripheral surface of the roll 2. Therefore, the convex defect is shaved with the blade portion 5 by bringing the blade portion 5 of the roll 2 into linear contact with the outer peripheral surface of the extruded raw tube P1 in a line obliquely with respect to the axial direction O of the extruded raw tube P1. Therefore, the convex defect can be surely removed.

  Furthermore, since the blade edge 5 a of the blade portion 5 of the roll 2 is formed from the side edge of the convex strip portion 3 continuous in the axial direction of the roll 2, the blade portion 5 can be easily formed on the peripheral surface of the roll 2. Can do.

  Further, the roll 2 is driven to rotate so that a portion of the peripheral surface facing the extrusion element pipe P1 moves in the opposite direction to the movement direction of the extrusion element pipe P1 (the drawing direction a). It is possible to reliably remove the defects.

  Furthermore, since the roll 2 revolves around the extrusion element pipe P1 around the extrusion element pipe P1, convex defects can be removed over the entire circumference of the outer peripheral surface of the extrusion element pipe P1.

  Furthermore, since the two rolls 2 and 2 are arranged around the extruded element pipe P1 so as to surround the extruded element pipe, the time required for removing the convex defects can be shortened.

  Therefore, the extruded element pipe P1 from which the convex defects have been removed by the removing device 1 has a very smooth outer peripheral surface. Therefore, by performing a drawing process, the photosensitive element having excellent dimensional accuracy and surface smoothness is obtained. An aluminum tube for a drum substrate can be manufactured. And, such an aluminum tube is constituted by using this as a base material because, for example, generation of a rust-like convex defect is prevented even if ultrasonic irradiation for cleaning or heating during OPC coating is performed. Leakage is less likely to occur when the photosensitive drum is uniformly charged.

  In the present embodiment, the moving speed (drawing speed) of the extruded element pipe P1 is set in a range of 10 to 60 m / min, for example. The rotation speed of the roll 2 is set in the range of 1 to 10 m / s, for example. The revolution speed of the roll 2 is set in a range of 50 to 300 rpm, for example.

  As shown in FIG. 5, the first and second removal waste removing devices 10 and 15 both remove the removal waste 31 adhering to the outer peripheral surface of the extrusion raw tube P <b> 1 after the removal of the convex defect by the roll 2. It is for removing from the outer peripheral surface of P1, and as shown in FIG. 1, it is arranged between the roll 2 and the drawing die 21 in the moving direction (drawing direction a) of the extrusion element pipe P1. In addition, the removal waste 31 is a strip, powdery particle, or the like removed by the roll 2. In FIG. 5, the size of the removal waste 31 is exaggerated in order to facilitate understanding of the present invention.

  The 2nd removal waste removal apparatus 15 has the drawing oil pouring apparatus 16 (drawing oil flowing-down apparatus). The drawing oil pouring device 16 has a short tubular pouring head 17 (outflow head) disposed substantially parallel to the diameter direction of the extruding element pipe p1 above the extruding element pipe P1, and an oil supply pipe 18 connected thereto. The outer peripheral surface of the extruded element pipe P1 immediately after passing through the removing device 1 by letting the drawing oil 19 supplied from the oil supply pipe 18 flow out from the plurality of pouring holes 17a (outflow holes) on the lower surface side of the pouring head 17 The drawing oil 19 is poured into the tank. Thus, the removal scraps 31 such as the fine pieces and powder particles removed by the roll 2 are attached to the outer peripheral surface of the extruded raw pipe P1 immediately after passing through the removal device 1. Will be washed away by the poured drawing oil 19 and removed from the outer peripheral surface of the extruded element pipe P1.

  The 1st removal waste removal apparatus 10 is arrange | positioned between the 2nd removal waste removal apparatus 15 and the extraction die | dye 21 in the moving direction (drawing direction a) of the extrusion element pipe P1. The first removal waste removing device 10 has a brush 12 as a brush-like material held inside the ring-shaped holding frame 11 in a mode in which the hair tips are directed from the entire circumference to the center, and the removal device 1 and the first Immediately before the extruding element pipe P1 that has sequentially passed through the 2 removal waste removing device 15 enters the drawing die 21, it is configured to pass through the central portion of the holding frame 11. Thus, even if the removal waste 31 still adheres and remains on the outer peripheral surface of the extruded raw tube P1, when the extruded raw tube P1 passes through the central portion of the holding frame 11 of the first removed waste removal device 10, The entire outer peripheral surface of the extruding element pipe P1 is rubbed with the brush 12, and the removal waste 31 is removed from the outer peripheral surface. That is, when the extruded element pipe P1 passes through the central portion of the holding frame 11, the brush 12 is brought into sliding contact with the entire outer peripheral surface of the extruded element pipe P1, thereby removing the removal waste 31 from the outer peripheral surface of the extruded element pipe P1. The

  In the present invention, the first removal waste removing device 10 is a donut shape made of a porous soft material such as a synthetic resin sponge, instead of the brush 12 (brush-like material) shown in the figure, inside the holding frame 11. You may use what attached the molding. Even in this case, by passing the extruded raw pipe P1 that has passed through the removing device 1 through the center hole of the doughnut-shaped molded product and rubbing the outer peripheral surface with a porous soft material, the attached debris 31 is removed from the outer peripheral surface. Can be excluded.

  Next, the examination result is demonstrated below regarding the suitable structure of the blade part 5 in the removal apparatus 1. FIG.

  First, FIG. 6 shows the rake angle and clearance angle in a general cutting blade 40. As shown in the figure, when the work material is the pipe body P and the relative traveling direction of the cutting blade body 40 is the arrow c direction, the cutting edge 40a of the cutting blade body 40 and the pipe body P from the center O of the pipe body P The angle α formed by the traveling direction front surface 40b of the cutting blade 40 with respect to the radius extension line r passing through the contact position is a rake angle, and when the traveling direction front surface 40b is in front of the radius extension line r, a negative rake is obtained. Angle (−α). In addition, an angle β formed by the rear surface 40c of the cutting blade 40 in the traveling direction with respect to the tangent s of the tube P at the contact position is a clearance angle.

  In the blade portion 5 of the roll 2, as shown in FIG. 7, it is recommended that the rake angle is in a negative range (−α), particularly in a range of −45 ° to 0 °. That is, when the rake angle is in the positive range (α), the cutting edge 5a becomes sharp and easily bites into the outer peripheral surface of the extruded element pipe P1, and the extruding element pipe P1 covers the surface layer of the outer peripheral surface by this biting. The removal scrap 31 which was cut out in a stripped form and thinned, and the uniformity of the drawing reduction was impaired due to the reduction in the thickness, resulting in a reduction in dimensional accuracy and a large amount of chips. Is caught between the extrusion element pipe P1 and the drawing die 21 and seized, and the outer peripheral surface after drawing becomes rough. On the other hand, when the rake angle is in the negative range (−α), the sharpness of the blade edge 5a is lost, and the blade edge 5a does not bite into the outer peripheral surface of the extruded element tube P1, and the blade portion 5 comes into sliding contact with the outer peripheral surface. Only the protruding convex defect and deposits are caught by the blade edge 5a and scraped off.

  On the other hand, the clearance angle β of the blade portion 5 is preferably set to be less than 3 °, so that the blade edge angle of the blade portion 5 itself changes from an acute angle close to a right angle to an obtuse angle in relation to the rake angle. Therefore, the blade portion 5 is less likely to have the cutting edge 5a, and the durability is improved accordingly.

  Further, as shown in FIG. 3, the blade edge 5a of the blade portion 5 is in an inclined state having an angle (contact angle θ) of 30 to 60 ° with respect to the axis O of the extruded raw tube P1, and the outer periphery of the extruded raw tube P1. It is better to contact the surface linearly. Thus, if the cutting edge 5a comes into linear contact with the axis O of the extruded element pipe P1 in an inclined state, the vibration of the element pipe P1 is suppressed, thereby effectively preventing chatter at the contact portion 6. In addition to scraping off the convex defects and deposits, the scraps 31 such as the strips and powder particles that have been scraped off can be released sideways along the inclination of the blade edge 5a. There is an advantage that it is possible to avoid the occurrence of scratches by biting between the outer peripheral surface of the extruded element pipe P1.

  Although one embodiment of the present invention has been described above, the present invention is not limited to that shown in the above embodiment, and various modifications can be made.

  Several modifications of the roll will be described below.

  FIG. 8 shows a modification of the roll. This roll 2 is formed by forming a plurality of concave strips 4 continuous in the axial direction of the roll 2 on its peripheral surface instead of the plurality of convex strips, and the cutting edge 5a of the blade portion 5 is the roll 2. Are formed from one side edge of each of the concave portions 4. In this modification, the concave strip 4 is continuous along the intersecting line between the plane including the axis of the roll 2 and the peripheral surface of the roll 2. The cross-sectional shape of the concave stripe part 4 is substantially trapezoidal. The depth of the concave stripe part 4 is set in a range of 1 to 3 mm, for example. The width of the recess 4 is set to a range of 2 to 5 mm, for example. In addition, if it explains in full detail, the side edge of the groove part 4 is a side edge between the surrounding surface of the roll 2 and one side surface of the groove part 4. FIG.

  FIG. 9 shows another modification of the roll. The roll 2 has a plurality of ridges 3 continuous in the axial direction of the roll 2 formed in a spiral shape (spiral) around the axis of the roll 2 on the circumferential surface of the roll 2. The blade edge 5a is formed from one side edge of the ridge portion 3 of each roll 2.

  FIG. 10 shows still another modification of the roll. The roll 2 has a plurality of concave strips 4 continuous in the axial direction of the roll 2 formed on the peripheral surface thereof in a spiral shape (spiral shape) with the axis of the roll 2 as the center. The blade edge 5a is formed from one side edge of each recess 4 of the roll 2.

  Further, in the present invention, the number of the rolls 2 of the removing device 1 is not limited to two, but may be one, three or more, particularly a plurality. It is desirable to be.

  Further, in the present invention, it is desirable that the roll is supported so as to be able to rotate as in the present embodiment in order to be able to reliably remove the convex defect, but it is simply supported so as to be capable of rotating without rotating. May be.

  The present invention can be used in a method and an apparatus for manufacturing an aluminum tube for a photosensitive drum substrate.

FIG. 1 is a plan view showing a drawing process and a pretreatment process in a method for producing a photosensitive drum substrate aluminum tube according to an embodiment of the present invention. FIG. 2 is a plan view of the removing device used in the pretreatment process. FIG. 3 is a partially cutaway side view of the removing device. FIG. 4 is a perspective view showing a drum-shaped roll of the removing device. FIG. 5 is a perspective view showing first and second removal waste removing devices used in the pretreatment process. FIG. 6 is a schematic cross-sectional view showing the relationship between the rake angle and the relief angle in tube cutting with a general cutting blade. FIG. 7 is a schematic cross-sectional view showing the relationship between the rake angle and clearance angle at the blade portion of the roll. FIG. 8 is a perspective view showing a modification of the roll. FIG. 9 is a perspective view showing another modification of the roll. FIG. 10 is a perspective view showing still another modified example of the roll.

Explanation of symbols

1: removal device 2: drum-shaped roll 3: convex strip portion 4: concave strip portion 5: blade portion 5a: blade edge 8: rotation drive device 8c: elastic member 10: first removal waste removal device 11: brush (brush-like material )
15: 2nd removal waste removal device 16: Drawing oil pouring device 19: Drawing oil 21: Drawing die 31: Removal waste P1: Extrusion tube P2: Drawing tube (aluminum tube for photosensitive drum base)
K: Aluminum pipe manufacturing apparatus for photosensitive drum substrate

Claims (14)

A method for producing an aluminum tube for a photosensitive drum base by drawing an extruded element tube,
As a pretreatment of the drawing processing, a relatively extruded raw pipe is moved in the axial direction of the mother tube with respect to drum-shaped roll blade portion continuous in the axial direction is formed on Rutotomoni peripheral surface are rotatably supports, The blade part of the roll is slidably contacted with the outer peripheral surface of the extruded element pipe linearly in an oblique direction with respect to the axis of the extruded element pipe, thereby removing the convex defects on the outer peripheral surface of the extruded element pipe with the blade part. A method for producing an aluminum tube for a photosensitive drum substrate, wherein the aluminum tube is removed. While the circumferential surface of the roll is provided with a ridge or a groove continuous in the axial direction of the roll,
The cutting edge of the blade portion, a manufacturing method of a photoconductor drum substrate for an aluminum tube according to claim 1 which is formed from a side edge of the convex portion or the concave portion of the roll. The method for producing an aluminum tube for a photosensitive drum substrate according to claim 1 or 2 , wherein a rake angle of the blade portion of the roll with respect to the outer peripheral surface of the extruded element tube is set in a range of -45 ° to 0 °. To extruded raw pipe to move axially with the drawing process, in any one of claims 1 to 3, extruded raw pipe is to remove the convex defect by the roll at a position before entering the drawing die The manufacturing method of the aluminum tube for photosensitive drum base | substrate of description. The roll is according to any one of the rotation driving and claims 1-4 so as to move in the opposite direction with respect to the extruded raw pipe side-facing portion in the peripheral surface movement direction of the extruded raw pipe Of producing an aluminum tube for a photosensitive drum substrate. The aluminum tube for a photosensitive drum base according to any one of claims 1 to 5 , wherein the roll is driven to revolve around the extruded element tube relative to the extruded element tube around the extruded element tube. Production method. The manufacturing method of the aluminum pipe | tube for photosensitive drum base | substrates of any one of Claims 1-6 by which the said some roll is arrange | positioned around the extrusion element pipe | tube. The method for producing an aluminum tube for a photosensitive drum substrate according to claim 7 , wherein each of the rolls is replaceable. The outer peripheral surface of the extrusion element tube after removal of the convex defects due to the roll, according to claim 1-8 by sliding a brush-like material or a porous soft material, to eliminate the removed debris from the outer peripheral surface of the extruded raw pipe The method for producing an aluminum tube for a photosensitive drum substrate according to any one of the above. The outer peripheral surface of the extrusion element tube after removal of the convex defects due to the roll, by pouring the drawing oil, according to any one of claims 1 to 9, to eliminate the removed debris from the outer peripheral surface of the extruded raw pipe A method for producing an aluminum tube for a photosensitive drum substrate. An apparatus for producing an aluminum tube for a photosensitive drum substrate, which produces an aluminum tube for a photosensitive drum substrate by drawing an extruded element tube,
Equipped with a drum-shaped roll for pretreatment of drawing,
The roll is supported so as to be capable of rotating , and further, a blade portion continuous in the axial direction of the roll is formed on the peripheral surface , and the extruded element tube moves in the axial direction relative to the roll. by sliding linearly in an oblique direction with respect to the outer circumferential surface on the roll of the blade portion of the extruded raw pipe axis, is to remove taking shaved convex defects of the outer peripheral surface of the extruded raw pipe in the cutting portion An apparatus for producing an aluminum tube for a photosensitive drum substrate. The roll is disposed at a position before the extruded element tube enters the drawing die, and removes convex defects from the extruded element tube that moves in the axial direction along with the drawing process. 11. An apparatus for producing an aluminum tube for a photosensitive drum substrate according to 11 . A first removal waste removing device disposed between the roll and the drawing die in the moving direction of the extruded element tube;
The first removal waste removing device has a brush-like material or a porous soft material, and the brush-like material or the porous soft material is placed on the outer peripheral surface of the extruded element tube after the removal of the convex defects by the roll. The apparatus for producing an aluminum tube for a photosensitive drum base according to claim 11 or 12 , wherein the scrap is removed from the outer peripheral surface of the extruded element tube by sliding contact. A second removal waste removing device disposed between the roll and the drawing die in the moving direction of the extruded element tube;
The second removal waste removal device has a drawing oil pouring device, and is removed by pouring the drawing oil by the drawing oil pouring device onto the outer peripheral surface of the extruded element tube after the removal of the convex defects by the roll. The apparatus for producing an aluminum tube for a photosensitive drum substrate according to any one of claims 11 to 13 , wherein the scrap is excluded from the outer peripheral surface of the extruded element tube.

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