JP5230215B2 - Method for producing aluminum tube for photosensitive drum substrate - Google Patents

Description

  The present invention relates to a method of manufacturing an aluminum tube for a photosensitive drum substrate used for a substrate of a photosensitive drum mounted in a copying machine, a laser printer, a facsimile machine, and the like, and an apparatus for manufacturing the same.

  In the present specification and claims, the term “aluminum” is used to include both pure aluminum and aluminum alloys unless otherwise specified. Further, “upstream side” and “downstream side” mean an upstream side and a downstream side in the drawing direction of the raw pipe, respectively.

  Aluminum tubes used for the base of a photosensitive drum mounted in an electrophotographic apparatus such as a copying machine, a laser printer, and a facsimile machine are coated with a uniform OPC (organic photoconductor) film on the outer peripheral surface thereof. Therefore, it is desirable that the surface state of the outer peripheral surface of the tube is relatively close to a mirror surface. Conventionally, the outer peripheral surface of a pipe has been finished to a mirror surface by cutting, but this method is not suitable for mass production of pipes because it is not easy to adjust and manage cutting tools and requires skill in cutting. Met.

  In recent years, therefore, there are non-cutting pipes such as DI pipes produced by ironing rolled aluminum sheets, EI pipes produced by ironing aluminum extruded element pipes, and ED pipes produced by drawing aluminum extruded element pipes. However, it is increasingly used as an aluminum tube for a photosensitive drum substrate. Above all, ED pipes are suitable for mass production because, unlike other non-cutting pipes, 10 or more product pipes can be manufactured in one process.

  A method for manufacturing the photosensitive drum substrate ED tube will be briefly described as follows. First, an aluminum billet is extruded to produce an aluminum extruded element tube. Next, the aluminum extruded element tube is cut into a predetermined length and then drawn to produce an aluminum tube having a predetermined shape (outer diameter, inner diameter, wall thickness). Next, the tube is cut into a predetermined length, and the cut end portion is chamfered, and then cleaning, dimensional inspection, and appearance inspection are sequentially performed to manufacture an aluminum tube for a photosensitive drum base.

As a conventional method for producing an aluminum tube for a photosensitive drum substrate, for example, methods disclosed in Japanese Patent Laid-Open Nos. 63-188422 and 9-99314 are known (Patent Documents 1 and 2). reference). The former (Japanese Patent Laid-Open No. 63-188422) discloses an aluminum tube having high surface smoothness by defining the approach angle and the bearing length of each of a drawing die and a plug for drawing an aluminum tube. Is disclosed. The latter (Japanese Patent Laid-Open No. 9-99314) has high surface smoothness by defining the viscosity of the lubricating oil for drawing, the outer diameter reduction rate and the cross-sectional area reduction rate from the blank tube to the drawing tube, respectively. A method of making an aluminum tube is disclosed.
JP-A 63-188422 JP-A-9-99314

  By the way, in recent years, the image quality required for the output image of the electrophotographic apparatus has become higher with the increasing use of figures and photographs. Therefore, not only the dimensional accuracy of the tube for the photosensitive drum base but also the surface of the outer peripheral surface of the tube As for the quality, a very high quality has been demanded. For example, a more uniform quality close to a mirror surface has been demanded.

  However, in the above-described conventional manufacturing method, since the raw tube is manufactured by extrusion, there are many variations in billet components, outer diameter, thickness, hardness, surface roughness, surface contamination, etc. Therefore, it has been difficult to satisfy such a high demand for the surface quality of the outer peripheral surface of the pipe even in the conventional manufacturing method described above.

  Further, in recent years, the cost of the photosensitive drum substrate has been reduced with the price reduction of the electrophotographic apparatus. Therefore, in order to cope with the reduction in the cost of the photosensitive drum base by efficiently manufacturing the pipe for the photosensitive drum base, it is necessary to increase the drawing speed of the raw tube. However, when the drawing speed of the raw pipe is increased, the kinematic viscosity of the lubricating oil is reduced by the processing heat, so that the outer peripheral surface of the raw pipe is likely to run out of oil and seizure may occur. In order to prevent the occurrence of seizure, it is generally known that a lubricant having a high kinematic viscosity may be used.

  However, as shown in FIG. 16, when a high kinematic viscosity lubricating oil 108 is used, a large number of large oil pits 122 are generated on the outer peripheral surface of the pipe 121 obtained by drawing the raw pipe 120. There arises a problem that the outer peripheral surface becomes rough like a pear. Thus, when the outer peripheral surface of the pipe 121 is rough, a high-quality image cannot be obtained. In FIG. 16, reference numeral 102 denotes a drawing die, 103 denotes a die holder holding the die 102, and 107a denotes a lubricating oil jet nozzle.

  On the other hand, as shown in FIG. 17, when the lubricating oil 108 having a low kinematic viscosity is used, the oil pit can be made fine, and the pipe 121 having high surface smoothness can be obtained. However, in this case, since the oil film strength is reduced, the outer peripheral surface of the base tube 120 is likely to run out of oil, and as a result, there is a problem that seizure occurs. In FIG. 17, reference numeral 124 denotes an oil shortage portion generated on the outer peripheral surface of the raw pipe 120, and reference numeral 123 denotes a linear scratch generated due to seizure on the outer peripheral surface of the pipe 121.

  The present invention has been made in view of the above-described technical background, and can reduce the oil pit, and can prevent the occurrence of seizure due to poor lubrication at the time of drawing the base tube. And a manufacturing apparatus for an aluminum tube for a photosensitive drum substrate that is preferably used in the method.

  The present invention provides the following means.

[1] A method for producing an aluminum tube for a photosensitive drum base by drawing an aluminum tube,
The scraper disposed on the upstream side of the drawing die is used to scrape the drawing lubricating oil adhering to the outer peripheral surface of the raw pipe and spread the lubricating oil on the outer peripheral surface of the raw pipe in the circumferential direction. A method for producing an aluminum tube for a photosensitive drum substrate, comprising drawing the tube.

  [2] The method for producing an aluminum tube for a photosensitive drum substrate as recited in the aforementioned Item 1, wherein the drawing speed is set to 10 m / min or more.

[3] The method for producing an aluminum tube for a photosensitive drum substrate according to item 1 or 2, wherein the kinematic viscosity of the lubricating oil is set to 400 mm ² / s or less.

  [4] Production of an aluminum tube for a photosensitive drum substrate according to any one of items 1 to 3, wherein at least the cutting edge portion of the scraper is made of a soft material having a hardness Hs measured by a spring type hardness meter A of 90 or less. Method.

  [5] The photosensitive drum substrate according to any one of the above items 1 to 4, wherein the scraper is provided with an insertion hole through which the raw tube is inserted, and a blade edge portion of the scraper is formed from an outer peripheral edge portion of the insertion hole. A method for manufacturing an aluminum tube.

  [6] The method for producing an aluminum tube for a photosensitive drum base as described in 5 above, wherein the diameter of the insertion hole of the scraper is set in the range of −5% to 0% with respect to the outer diameter of the raw tube.

  [7] The preceding item 5 or 6, wherein a catching groove for catching the lubricating oil scraped off from the outer peripheral surface of the raw tube is provided on the side surface on the upstream side of the blade tip portion of the scraper extending in the circumferential direction of the blade tip portion. A method for producing an aluminum tube for a photosensitive drum substrate.

  [8] Manufacture of an aluminum tube for a photosensitive drum base according to any one of items 5 to 7, wherein a cutting edge extending radially outward of the insertion hole from the inner peripheral surface of the insertion hole is provided in the blade edge portion of the scraper. Method.

  [9] The method for producing an aluminum tube for a photosensitive drum substrate according to any one of the above items 5 to 8, wherein the scraper is divided into a plurality of elements in the circumferential direction around the insertion hole.

  [10] The method for producing an aluminum tube for a photosensitive drum substrate according to any one of the aforementioned Items 1 to 9, wherein the scraper is permanently installed at a position where the lubricating oil is scraped upstream of the die.

  [11] The method for producing an aluminum tube for a photosensitive drum base as recited in the aforementioned Item 10, wherein the scraper is detachably fixed to the upstream end surface of the die or the upstream end surface of the die holder holding the die.

  [12] The scraper is attached to the upstream end surface of the die or the upstream end surface of the die holder holding the die so as to be removable and movable along the end surface. A method for producing an aluminum tube for a photosensitive drum substrate.

  [13] The photosensitive drum substrate according to any one of the aforementioned Items 1 to 10, wherein the scraper is arranged on the upstream side of the die so as to be movable in the drawing direction of the raw tube, in the opposite direction and in the direction perpendicular to the drawing direction. Of manufacturing aluminum pipes for use.

  [14] The preceding item 13 is configured such that the scraper can be moved in the drawing direction of the raw tube, in the opposite direction, and in the direction perpendicular to the drawing direction by being suspended by elastically stretchable strips. The manufacturing method of the aluminum tube for photosensitive drum base | substrate of description.

[15] The scraper is disposed at a position different from the lubricating oil scraping position on the upstream side of the die when the blank pipe is not drawn.
10. The method for producing an aluminum tube for a photosensitive drum substrate according to any one of the preceding items 1 to 9, wherein a scraper is disposed at a lubricating oil scraping position on the upstream side of the die when drawing of the raw tube is started.

  [16] The method for producing an aluminum tube for a photosensitive drum substrate according to any one of the above items 1 to 15, wherein the material of the raw tube is Al-Mn, Al-Mg, Al-Mg-Si, or pure aluminum .

[17] 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 aluminum tube,
A drawing die,
A tube driving means for moving the aluminum tube in the drawing direction;
Lubricating oil adhering means for adhering the drawing lubricating oil to the outer peripheral surface of the base tube,
A scraper disposed upstream of the die, and
The scraper scrapes off the lubricating oil adhering to the outer peripheral surface of the raw pipe being moved in the drawing direction by the raw pipe driving means, and spreads the lubricating oil on the outer peripheral surface of the raw pipe in the circumferential direction. An apparatus for producing an aluminum tube for a photosensitive drum substrate.

  [18] The apparatus for producing an aluminum tube for a photosensitive drum substrate as recited in the aforementioned Item 17, wherein the tube driving means moves the tube in the drawing direction so that the drawing speed is 10 m / min or more.

[19] The apparatus for producing an aluminum tube for a photosensitive drum substrate according to the above item 17 or 18, wherein the kinematic viscosity of the lubricating oil adhered to the outer peripheral surface of the raw tube by the lubricating oil adhering means is set to 400 mm ² / s or less.

  [20] Production of an aluminum tube for a photosensitive drum substrate according to any one of items 17 to 19 above, wherein at least the cutting edge portion of the scraper is made of a soft material having a hardness Hs of 90 or less as measured by a spring type hardness tester A type. apparatus.

  [21] The photosensitive drum substrate according to any one of [17] to [20], wherein the scraper is provided with an insertion hole through which the raw tube is inserted, and a blade edge portion of the scraper is formed from an outer peripheral edge portion of the insertion hole. Aluminum pipe manufacturing equipment.

  [22] The apparatus for producing an aluminum tube for a photosensitive drum substrate as recited in the aforementioned Item 21, wherein the diameter of the insertion hole of the scraper is set in the range of −5% to 0% with respect to the outer diameter of the raw tube.

  [23] The preceding item 21 or 22, wherein a catching groove for catching the lubricating oil scraped from the outer peripheral surface of the raw pipe is provided on the upstream side surface of the scraper blade tip portion extending in the circumferential direction of the blade tip portion. An apparatus for producing an aluminum tube for a photosensitive drum substrate.

  [24] The manufacturing of the aluminum tube for a photosensitive drum base according to any one of the above items 21 to 23, wherein the scraper blade edge is provided with a cut extending radially outward of the insertion hole from the inner peripheral surface of the insertion hole. apparatus.

  [25] The apparatus for producing an aluminum tube for a photosensitive drum substrate according to any one of the above items 21 to 24, wherein the scraper is divided into a plurality of elements in the circumferential direction around the insertion hole.

  [26] The apparatus for producing an aluminum tube for a photosensitive drum substrate according to any one of [17] to [25], wherein the scraper is permanently installed at a lubricating oil scraping position on the upstream side of the die.

  [27] The apparatus for producing an aluminum tube for a photosensitive drum substrate according to [26], wherein the scraper is detachably fixed to the upstream end face of the die or the upstream end face of the die holder holding the die.

  [28] The scraper according to any one of items 17 to 26, wherein the scraper is detachably attached to the upstream end surface of the die or the upstream end surface of the die holder holding the die and is movably attached along the end surface. An apparatus for producing an aluminum tube for a photosensitive drum substrate.

  [29] The photosensitive drum substrate according to any one of items 17 to 26, wherein the scraper is arranged on the upstream side of the die so as to be movable in a drawing direction of the raw tube, a direction opposite thereto, and a direction perpendicular to the drawing direction. Aluminum tube manufacturing equipment.

  [30] The above item 29, wherein the scraper is suspended by an elastically expandable and contractible member so as to be movable in the drawing direction of the raw tube, in the opposite direction, and in the direction perpendicular to the drawing direction. The manufacturing apparatus of the aluminum tube for photosensitive drum base | substrate of description.

[31] A scraper moving means for moving the scraper to a position at which the lubricant is scraped upstream of the die and a position different from the position at which the lubricant is scraped is provided.
The scraper moving means moves the scraper to a position different from the lubricant scraping position on the upstream side of the die when the blank pipe is not drawn, and the scraper is moved to the die when the blank pipe is drawn. 26. An apparatus for producing an aluminum tube for a photosensitive drum substrate according to any one of items 17 to 25 above, which is moved to a lubricating oil scraping position on the upstream side of the photosensitive drum substrate.

  The present invention has the following effects.

  In the method for producing an aluminum tube for a photosensitive drum substrate according to the invention of [1], the drawing process is performed in which the scraper disposed on the upstream side of the drawing die is attached to the outer peripheral surface of the blank when the blank is drawn. By scraping the lubricating oil for use and spreading the lubricating oil on the outer peripheral surface of the base tube in the circumferential direction, it is possible to prevent seizure due to poor lubrication even when a lubricating oil having a low kinematic viscosity is used. As a result, the oil pit can be reduced, and the surface smoothness of the outer peripheral surface of the pipe can be increased.

  In the invention of [2], by setting the drawing speed to a predetermined speed or higher, the pipe can be manufactured efficiently, and the manufacturing cost of the pipe can be reduced. Moreover, even when the drawing speed is set to a high speed as described above, the occurrence of oil pits can be suppressed.

  In the invention of [3], by using a lubricating oil having a kinematic viscosity of a predetermined value or less, the oil pit can be reliably reduced, and the surface smoothness of the outer peripheral surface of the pipe can be reliably increased. it can.

  In the invention of [4], the scraper can be made suitable for scraping and spreading the lubricating oil, so that the lubricating oil can be surely scraped and spread reliably. Furthermore, the scraper can be reliably prevented from being damaged by the scraper coming into contact with the outer peripheral surface of the raw pipe when the lubricating oil is scraped off.

  In the invention of [5], the scraper can surely scrape the lubricating oil from the outer peripheral surface of the base tube, and the lubricant can be reliably spread on the outer peripheral surface of the base tube in the circumferential direction.

  In the invention of [6], by setting the diameter of the insertion hole of the scraper within a predetermined range with respect to the outer diameter of the raw tube, the scraping amount of the lubricating oil by the scraper can be set to an appropriate amount, and the lubrication Oil can be reliably spread thinly on the outer peripheral surface of the base tube.

  In the invention of [7], the lubricating oil scraped off from the outer peripheral surface of the raw tube can be captured in the capture groove of the scraper blade edge. Therefore, the lubricating oil necessary for spreading on the outer peripheral surface of the raw tube can be stably supplied from the catching groove to the outer peripheral surface of the raw tube.

  In the invention of [8], since the cutting edge portion of the scraper is provided with a cut, even if the cutting edge portion of the scraper is worn and the diameter of the insertion hole is increased, the scraper blade edge portion is not applied to the outer peripheral surface of the raw tube. Contact pressure does not change much. Therefore, the scraper can be used for a long time.

  In the invention of [9], the plurality of elements of the scraper can be brought into contact with the outer peripheral surface of the raw tube from multiple directions, and the operation of inserting the raw tube into the insertion hole can be easily performed.

  In the invention of [10], the configuration of the scraper can be simplified as compared with a configuration in which the scraper is movable to a lubricating oil scraping position and a position different from the scraping position.

  In the invention of [11], since the scraper is fixed to the upstream end face of the die or the upstream end face of the die holder, the scraper can be reliably disposed at the lubricating oil scraping position. Furthermore, since the scraper is detachably fixed, the scraper can be removed when the bearing portion of the die is visually inspected, whereby the bearing portion can be reliably inspected.

  In the invention of [12], since the scraper is adhered to the upstream end face of the die or the upstream end face of the die holder, the scraper can be reliably disposed at the lubricating oil scraping position. Furthermore, since the scraper is detachably attached, the scraper can be removed when the bearing portion of the die is visually inspected, whereby the bearing portion can be reliably inspected.

  In addition, since the scraper is movably attached along the upstream end face of the die or the upstream end face of the die holder, the scraper is positioned at the scraping position when the scraper is placed at the lubricating oil scraping position. There is an advantage that it is not necessary to strictly carry out.

  In the invention of [13], since the scraper is arranged so as to be movable in the drawing direction of the raw tube, in the opposite direction and in the direction perpendicular to the drawing direction, the scraper is used when visually inspecting the bearing portion of the die. The scraper can be arranged at a position that does not hinder the inspection of the bearing portion by moving the tube in a direction opposite to the drawing direction of the blank tube or moving in a direction perpendicular to the drawing direction. Thereby, an inspection of a bearing part can be performed easily.

  In the invention of [14], the scraper can be moved in a predetermined direction (that is, the drawing direction, the opposite direction, and the direction perpendicular to the drawing direction) with a simple configuration.

  Furthermore, when inspecting the bearing portion of the die, for example, by grasping the scraper by hand, the scraper is moved in a direction opposite to the drawing direction of the raw tube, or the scraper is moved in a direction perpendicular to the drawing direction. The scraper can be easily arranged at a position that does not hinder the inspection of the bearing portion. Then, when the inspection of the bearing portion is completed, when the hand is released from the scraper, the scraper is moved to the original position by the elastic restoring force of the strip, so that the scraper can be reliably and easily returned to the original position. .

  Moreover, since the scraper is suspended by elastically stretchable strips, there is no need to strictly position the scraper at the scraping position when the scraper is placed at the lubricating oil scraping position. There is.

  In the invention of [15], the scraper is disposed at a position different from the lubricating oil scraping position on the upstream side of the die when the blank pipe is not drawn, so that the bearing portion of the die is inspected. The bearing portion is prevented from being covered with a scraper. Thereby, an inspection of a bearing part can be performed easily.

  In the invention of [16], an aluminum tube having high surface smoothness can be reliably obtained.

  The apparatus for producing an aluminum tube for a photosensitive drum substrate according to the inventions [17] to [31] exhibits the same effects as the effects of the inventions [1] to [15], respectively.

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

  FIGS. 1-6 is a figure explaining the manufacturing method and apparatus of the aluminum tube for photosensitive drum bases which concern on one Embodiment of this invention. Reference numeral 1 denotes an apparatus for manufacturing an aluminum tube for a photosensitive drum substrate according to the present embodiment.

  As shown in FIG. 1, this apparatus 1 is for producing an aluminum tube 21 for a photosensitive drum substrate by drawing an aluminum base tube 20. The apparatus 1 includes a drawing die 2, a lubricant adhering means 7, a raw tube driving means 9, a scraper 5 and the like as main components.

  The aluminum raw tube 20 is an aluminum extruded raw tube obtained by extruding an aluminum billet, and its cross-sectional shape is circular.

  The outer diameter D (see FIG. 3) of the raw tube 20 is, for example, 20 to 50 mm, and the thickness of the raw tube 20 is, for example, 1 to 3 mm. However, the present invention is not limited to the outer diameter D and the wall thickness of the raw tube 20 being in the above ranges, respectively.

  The material of the element tube 20 is not particularly limited, but is preferably Al—Mn, Al—Mg, Al—Mg—Si, or pure aluminum. On the other hand, when the material of the raw tube 20 is, for example, Al—Cu, Al—Si, or Al—Zn—Mg, the outer peripheral surface of the raw tube 20 is hard, so that the outer peripheral surface of the raw tube 20 is smoothed. Difficult to do. Accordingly, the material of the raw tube 20 is preferably Al—Mn, Al—Mg, Al—Mg—Si, or pure aluminum, and by using the raw tube 20 of such a material, high surface smoothness is achieved. It is possible to reliably obtain the aluminum tube 21 having the properties.

  The outer diameter of the photosensitive drum base aluminum tube 21 (ie, aluminum ED tube) obtained by drawing the base tube 20 is, for example, 20 to 30 mm, and the thickness of the tube 21 is, for example, 0.5 to 2 mm. It is. However, the present invention is not limited to the outer diameter and the wall thickness of the tube 21 being in the above ranges, respectively.

  As shown in FIGS. 2 and 3, the die 2 is used for drawing the raw tube 20. As shown in FIG. 4, the dice 2 are accommodated in a dice holding recess 3 b provided at the center of the dice holder 3, whereby the dice 2 are held in a fixed state by the dice holder 3. Reference numeral 2b denotes a die hole of the die 2, and 2c denotes a bearing portion of the die 2.

  The upstream end surface 2 a of the die 2 and the upstream end surface 3 a of the die holder 3 are both formed perpendicular to the drawing direction X of the raw tube 20 and flat. Further, the upstream end surface 3 a of the die holder 3 is disposed on the upstream side of the upstream end surface 2 a of the die 2.

  The bearing length L1 of the die 2 is set to 5 to 30 mm, for example, and the approach angle θ1 of the die 2 is set to 20 to 70 °, for example. However, the present invention is not limited to the bearing length L1 and the approach angle θ1 being in the above ranges, respectively.

  As shown in FIG. 2, a drawing plug 4 is disposed in the hollow portion of the raw tube 20. In the plug 4 shown in FIG. 5, 4 a is a bearing portion of the plug 4. The bearing length L2 of the plug 4 is set to 0.5 to 3 mm, for example, and the approach angle θ2 of the plug 4 is set to 5 to 30 °, for example. However, the present invention is not limited to the bearing length L2 and the approach angle θ2 being in the above ranges, respectively. Reference numeral 4b denotes a support bar that supports the plug 4.

  As shown in FIG. 1, the raw tube driving means 9 moves the raw tube 20 in the drawing direction X, and has a chuck means 9a and a hydraulic cylinder 9b as a drive source.

  The chuck means 9 a chucks a small diameter mouthpiece 20 a formed at the tip of the raw tube 20.

  The hydraulic cylinder 9b moves the chuck means 9a that chucks the mouthpiece 20a of the raw tube 20 in the drawing direction X, thereby moving the raw tube 20 in the drawing direction X. 2 and 3, the raw tube driving means 9 (chuck means 9a, hydraulic cylinder 9b) is not shown.

  The lubricating oil adhering means 7 adheres the drawing lubricating oil 8 to the outer peripheral surface of the raw pipe 20 from the upper side of the raw pipe 20 and has a lubricating oil jet nozzle 7a. The nozzle 7a is disposed on the upstream side of the die 2 and the die holder 3 (more specifically, on the upstream side of the scraper 5 to be described later) with the jet port directed toward the outer peripheral surface of the elementary tube 20 (ie, on the lower side). Is arranged). The lubricating oil 8 ejected from the nozzle 7a is for reducing the frictional resistance between the outer peripheral surface of the raw tube 20 and the bearing portion 2c of the die 2 and preventing the raw tube 20 from seizing.

  Lubricating oil 8 is not particularly limited, and commercially available oil for drawing is used. The trade name “Dafney Master Draw” manufactured by Idemitsu Kosan Co., Ltd., manufactured by Sugimura Chemical Co., Ltd. The product name “Sandrow”, the product name “Strol” manufactured by Kyoei Yuka Co., Ltd., etc. are used.

Further, it is desirable to use an oil having a low kinematic viscosity as the lubricating oil 8, and in particular, it is desirable to use an oil having a kinematic viscosity of 400 mm ² / s (ie, 400 cSt) or less because the oil pit can be reliably reduced. . Furthermore, the desirable kinematic viscosity of the lubricating oil 8 is 200 mm ² / s (ie, 200 cSt) or less. In the present invention, the lower limit value of the kinematic viscosity of the lubricating oil 8 is not limited, but may be, for example, 50 mm ² / s (ie, 50 cSt). The kinematic viscosity value of the lubricating oil 8 is a value at 40 ° C.

  The scraper 5 scrapes off the lubricating oil 8 attached by the lubricating oil adhering means 7 on the outer peripheral surface of the raw pipe 20 that has been moved in the drawing direction X by the raw pipe driving means 9, and removes the lubricating oil 8 from the raw pipe 20. The outer peripheral surface is thinly spread in the circumferential direction.

  As shown in FIGS. 2 and 3, the scraper 5 is disposed at a position spaced from the upstream end faces 2 a and 3 a of the die 2 and the die holder 3 on the upstream side of the die 2 and the die holder 3. The arrangement position of the scraper 5 is a position where the lubricating oil 8 can be appropriately scraped from the outer peripheral surface of the raw tube 20, that is, a lubricating oil scraping position. Further, the scraper 5 is supported by a support member (not shown) so that the arrangement position of the scraper 5 is fixed. In this way, the scraper 5 is permanently installed at the lubricating oil scraping position on the upstream side of the die 2 and the die holder 3. However, the present invention is not limited to the scraper 5 being permanently installed at the lubricating oil scraping position, and the scraper 5 has a lubricating oil scraping position and the scraping position as shown in an example shown in FIG. It may be configured to be movable to a different position.

  The distance between the arrangement position of the scraper 5 and the inlet position of the die hole 2b of the die 2 is set to 0 to 50 mm, for example. However, the present invention is not limited to the above range.

  Further, the lubricating oil jet nozzle 7 a is arranged on the upstream side of the scraper 5. The distance between the arrangement position of the nozzle 7a and the arrangement position of the scraper 5 is set to 5 to 100 mm, for example. However, the present invention is not limited to the above range.

  As shown in FIG. 6, the scraper 5 is plate-shaped (specifically, disk-shaped). Further, an insertion hole 5 b through which the raw tube 20 is inserted is formed at the center of the scraper 5. It is provided penetrating in the thickness direction. The cross-sectional shape of the insertion hole 5b is a shape corresponding to the cross-sectional shape of the raw tube 20, that is, a circular shape. The blade edge portion 5a of the scraper 5 is formed from the outer peripheral edge portion of the insertion hole 5b, and the lubricating oil 8 is scraped off from the outer peripheral surface of the raw tube 20 inserted into the insertion hole 5b by the blade edge portion 5a. In addition, the lubricating oil 8 is applied to the outer peripheral surface of the base tube 20 in the circumferential direction. Thus, the lubricant oil 8 is spread on the outer peripheral surface of the raw tube 20 by the scraper 5, whereby a uniform thin oil film is formed on the outer peripheral surface of the raw tube 20 over the entire circumference in the circumferential direction.

  Further, at least the cutting edge portion 5a of the scraper 5 is made of a soft material such as rubber or soft resin. In particular, Hs measured by a spring type hardness meter A type defined by JIS (Japanese Industrial Standard) K6301 is 90. The following soft materials are desirable. In the present invention, the lower limit value of the hardness Hs is not particularly limited, but is preferably 40, for example. In the present invention, the scraper 5 may be made of a porous soft material such as polyurethane foam, polystyrene foam, or sponge. In the present embodiment, the entire scraper 5 is made of the desired soft material. In the present invention, only the cutting edge portion 5a of the scraper 5 may be made of the above-mentioned desirable soft material.

  The thickness T of the scraper 5 (more specifically, the thickness T of the cutting edge portion 5a of the scraper 5) is set to 1 to 5 mm, for example. Further, the diameter E of the insertion hole 5b of the scraper 5 is set in a range of −5% to 0% (particularly desirably −4% to −1%) with respect to the outer diameter D of the raw tube 20.

  Next, a method for manufacturing the photosensitive drum base aluminum tube 21 using the apparatus 1 will be described below.

  As the raw tube 20, an aluminum extruded raw tube obtained by extruding an aluminum billet is prepared. The mouthpiece 20a is formed at the tip of the raw tube 20 by swaging.

  As shown in FIGS. 1 to 3, the mouthpiece 20 a of the blank tube 20 is sequentially inserted into the insertion hole 5 b of the scraper 5 and the die hole 2 b of the die 2, and then the mouthpiece 20 a is inserted into the blank tube driving means. 9 chucking means 9a. Further, the plug 4 is disposed in the hollow portion of the raw tube 20.

  In a state where the raw tube 20 is inserted into the insertion hole 5 b of the scraper 5, the cutting edge portion 5 a of the scraper 5 is in close contact with the outer peripheral surface of the raw tube 20 over the entire circumference thereof. Here, when the diameter E of the insertion hole 5b of the scraper 5 is set to be smaller than the outer diameter D of the raw tube 20 (that is, when E <D), the cutting edge portion 5a of the scraper 5 is The outer peripheral surface is in pressure contact with the entire circumference in the circumferential direction.

  Next, the lubricating oil 8 is ejected from the lubricating oil ejection nozzle 7a toward the outer peripheral surface of the base tube 20, and thereby the lubricating oil 8 is supplied and adhered to the outer peripheral surface of the raw tube 20 as much as possible over the entire circumference. . The ejection amount of the lubricating oil 8 ejected from the nozzle 7a is set to 1 to 5 L / min, for example. However, the present invention is not limited to the amount of the lubricant 8 ejected within the above range. That is, the ejection amount of the lubricating oil 8 is set according to the size of the outer diameter D of the raw tube 20 and the drawing speed of the raw tube 20.

  Thus, the hydraulic cylinder 9 b of the raw tube driving means 9 is operated while the lubricating oil 8 is ejected from the nozzle 7 a toward the outer peripheral surface of the raw tube 20 and the lubricating oil 8 is adhered to the outer peripheral surface of the raw tube 20. As a result, the scraper 5 (specifically, the cutting edge portion 5a of the scraper 5) scrapes off the lubricating oil 8 (excessive lubricating oil 8 in detail) adhering to the outer peripheral surface of the raw tube 20 and removes the lubricating oil 8 from the raw material. The thin tube 20 is moved in the drawing direction X so that the drawing speed is 10 m / min or more while thinly spreading the outer circumference of the tube 20 over the entire circumference in the circumferential direction. By moving the raw tube 20 in this way, the raw tube 20 is reduced in diameter by the die hole 2b of the die 2 and drawn.

  In this drawing process, as described above, the drawing speed of the tube 21 is set to 10 m / min or more. By doing so, the tube 21 can be efficiently manufactured, and the manufacturing cost of the tube 21 can be reduced. In the present invention, the upper limit value of the drawing speed is not limited, but is preferably 100 m / min, for example.

  The long tube 21 obtained by this drawing process is cut into a predetermined length, and after the cut end portion is chamfered, cleaning, dimension inspection, and appearance inspection are sequentially performed. Then, it is sent to another process necessary for manufacturing the photosensitive drum.

  The manufacturing method of the photosensitive drum base aluminum tube 21 according to the embodiment has the following advantages.

  By scraping the lubricating oil 8 adhering to the outer peripheral surface of the raw pipe 20 by the scraper 5 and drawing the lubricating oil 8 on the outer peripheral face of the raw pipe 20 in the circumferential direction when the raw pipe 20 is drawn. Even if the lubricating oil 8 having a low kinematic viscosity is used, the occurrence of seizure due to poor lubrication can be prevented. Thereby, an oil pit (refer FIG. 15, 122) can be made small, and the surface smoothness of the outer peripheral surface of the pipe | tube 21 can be made high.

  Furthermore, by moving the raw tube 20 in the drawing direction X so that the drawing speed is 10 m / min or more, the tube 21 can be efficiently manufactured, and thus the manufacturing cost of the tube 21 can be reduced. Moreover, even when the drawing speed is set to a high speed of 10 m / min or higher, the occurrence of oil pits can be suppressed.

Furthermore, by using the lubricating oil 8 having a kinematic viscosity of 400 mm ² / s or less, the oil pit can be reliably reduced, and the surface smoothness of the outer peripheral surface of the tube 21 can be reliably increased.

  Further, at least the cutting edge portion 5a of the scraper 5 is made of a soft material having a hardness Hs measured by a spring type hardness meter A of 90 or less, so that the scraper 5 can be used for scraping and spreading the lubricating oil 8. Therefore, the lubricating oil 8 can be surely scraped off and reliably spread. Furthermore, when the lubricating oil 8 is scraped off, it is possible to reliably prevent the outer peripheral surface of the raw tube 20 from being scratched by the cutting edge portion 5 a of the scraper 5 coming into contact with the outer peripheral surface of the raw tube 20.

  Furthermore, the scraping amount of the lubricating oil 8 by the scraper 5 is set to an appropriate amount by setting the diameter E of the insertion hole 5b of the scraper 5 within a range of -5% to 0% with respect to the outer diameter D of the base tube 20. The lubricating oil 8 can be surely spread thinly and uniformly on the outer peripheral surface of the base tube 20.

  Furthermore, since the scraper 5 is permanently installed on the upstream side of the die 2, the scraper 5 is compared with a scraper 5 that is configured to be movable between a lubricating oil scraping position and a position different from the scraping position. The configuration of 5 can be simplified.

  Further, the photosensitive drum substrate aluminum tube manufacturing apparatus 1 according to the above embodiment has the same effect as described above when the photosensitive drum substrate aluminum tube 21 is manufactured (that is, when the blank tube 20 is drawn). .

  Thus, in the present invention, the configuration of the scraper 5 in the apparatus 1 of the above embodiment can be variously changed. Some modifications thereof will be described below.

  7A and 7B are diagrams illustrating a first modification of the scraper 5 in the device 1 of the above embodiment.

  In the scraper 5, an annular catch groove 5c that catches the lubricating oil 8 scraped from the outer peripheral surface of the raw tube 20 is formed on the upstream side surface of the cutting edge portion 5a of the scraper 5 in the circumferential direction of the cutting edge portion 5a. It extends over the circumference. The capture groove 5c is arranged concentrically with the insertion hole 5b.

  The cross-sectional shape of the capture groove 5c is an arc shape. However, the present invention is not limited to the cross-sectional shape of the capture groove 5c being an arc shape, and may be a V shape, a U shape, a U shape, or the like.

  The width of the capture groove 5c is set to 1 to 5 mm, for example, and the depth of the capture groove 5c is set to 0.5 to 3 mm, for example. However, the present invention is not limited to the width and depth of the capture groove 5c being in the above ranges, respectively. In the present invention, the number of the capture grooves 5c may be one or plural. When the number of the capture grooves 5c is plural, the capture grooves 5c are arranged, for example, concentrically with the insertion hole 5b and spaced in the radial direction of the insertion hole 5b.

  According to the scraper 5, the lubricating oil 8 scraped from the outer peripheral surface of the raw tube 20 can be captured in the capturing groove 5 c of the cutting edge portion 5 a of the scraper 5. Therefore, the lubricating oil 8 necessary for spreading on the outer peripheral surface of the raw tube 20 can be stably supplied from the catching groove 5 c to the outer peripheral surface of the raw tube 20. Thereby, a uniform oil film can be reliably formed on the outer peripheral surface of the raw tube 20.

  FIG. 8 is a diagram illustrating a second modification of the scraper 5 in the apparatus 1 of the above embodiment.

  In the scraper 5, a plurality of cuts 5d extending radially outward of the insertion hole 5b from the inner peripheral surface of the insertion hole 5b are spaced apart from each other in the circumferential direction of the blade edge part 5a. It is arranged. In this example, eight cuts 5d are arranged at equal intervals in the circumferential direction of the blade edge portion 5a. The length of the cut 5d is preferably set to 1 to 5 mm, for example. However, the present invention is not limited to the length of the cut 5d being in the above range.

  According to this scraper 5, since the notch 5d is provided in the cutting edge portion 5a of the scraper 5, even if the cutting edge portion 5a of the scraper 5 is worn and the diameter E of the insertion hole 5b is enlarged, the cutting edge portion of the scraper 5 is provided. The abutting pressure on the outer peripheral surface of 5a does not change much. Therefore, the scraper 5 can be used for a long time.

  FIG. 9 is a diagram illustrating a third modification of the scraper 5 in the apparatus 1 of the above embodiment.

  The scraper 5 is equally divided into three elements 5f in the circumferential direction around the insertion hole 5b.

  According to this scraper 5, the cutting edge 5a of the three elements 5f of the scraper 5 can be brought into contact with the outer peripheral surface of the raw tube 20 from three directions, and the insertion work of the raw tube 20 into the insertion hole 5b can be performed. It can be done easily.

  FIG. 10 is a diagram illustrating a fourth modification of the scraper 5 in the device 1 of the above embodiment.

  The scraper 5 is equally divided into four elements 5f in the circumferential direction around the insertion hole 5b.

  According to this scraper 5, the cutting edge 5a of the four elements 5f of the scraper 5 can be brought into contact with the outer peripheral surface of the element tube 20 from four directions, and the insertion operation of the element tube 20 into the insertion hole 5b can be performed. It can be done easily.

  Here, in the third modification and the fourth modification described above, the number of divisions of the scraper 5 is 3 and 4, respectively, but in the present invention, the number of divisions of the scraper 5 is, for example, two. Or four or more.

  Moreover, in this invention, the cross-sectional shape of the blade edge | tip part 5a of the scraper 5 is not limited to the shape shown to FIG. 7B, It can change variously, The some modification is shown in FIG. . Further, in the present invention, a capture groove (5c, see FIG. 7B) may be provided on the upstream side surface of each cutting edge portion 5a having the cross-sectional shape shown in FIG.

  Thus, in the present invention, the arrangement configuration of the scraper 5 in the apparatus 1 of the above embodiment can be variously changed. Some modifications thereof will be described below.

  FIG. 12 is a diagram illustrating a first modification of the arrangement configuration of the scraper 5 in the apparatus 1 of the above embodiment.

  In this first modification, the scraper 5 is fixed to the upstream end surface 3a of the soybean holder 3 by a plurality of fixing screws 5g so as to be removable. Thereby, the scraper 5 is permanently installed at the lubricating oil scraping position on the upstream side of the die 2 and the die holder 3. Moreover, the scraper 5 is removed from the end surface 3a of the soybean holder 3 by removing the fixing screw 5g.

  According to the arrangement configuration of the scraper 5, since the scraper 5 is fixed to the end surface 3a of the soybean holder 3, the scraper 5 can be reliably arranged at the lubricating oil scraping position. Further, since the scraper 5 is detachably fixed, the scraper 5 can be removed when the bearing portion 2c of the die 2 is visually inspected, whereby the bearing portion 2c can be reliably inspected. .

  Here, in the first modified example, the scraper 5 is fixed to the end face 3a on the upstream side of the die holder 3, but in the present invention, the scraper 5 is also fixed to the end face 2a on the upstream side of the die 2. May be.

  13 and 14 are diagrams illustrating a second modification of the arrangement configuration of the scraper 5 in the apparatus 1 of the above embodiment.

  In the second modification, the scraper 5 is disposed at a position away from the end surfaces 2 a and 3 a on the upstream side of the die 2 and the die holder 3 on the upstream side of the die 2 and the die holder 3. Further, the scraper 5 is held by the scraper holding means 10 that holds the scraper 5 so as to be movable in the drawing direction X of the raw tube 20, the opposite direction, and the direction perpendicular to the drawing direction X.

  The configuration of the scraper holding means 10 is as follows. That is, the scraper 5 is suspended by a strip 5e that can elastically extend and contract in the length direction, and the scraper 5 is moved downward by two strips 5e and 5e that can elastically extend and contract in the length direction. The suspended position of the scraper 5 is maintained by being pulled. As each strip 5e, a rubber string, a tension coil spring, or the like is used. By arranging the scraper 5 in this way, the scraper 5 can move in the drawing direction X of the raw tube 20, the opposite direction, and the direction perpendicular to the drawing direction X.

  In the drawing process, as shown in FIG. 14, the scraper 5 is moved in the drawing direction X together with the blank 20 by moving the blank 20 in the drawing direction X. As the scraper 5 moves, each strip 5e is elastically extended. Then, the scraper 5 comes into contact with the upstream end faces 2a and 3a of the die 2 or the die holder 3 and is attached to the end faces 2a and 3a. In the figure, the scraper 5 is affixed not to the end surface 2 a of the die 2 but to the end surface 3 a of the die holder 3. In this pasted state, the scraper 5 is disposed so as to be movable along the end surface 3a of the die holder 3 (that is, in a direction orthogonal to the drawing direction X).

  When the raw tube 20 is drawn over its entire length region and the raw tube 20 is extracted from the insertion hole 5b of the scraper 5, the scraper 5 is moved to the end face of the die holder 3 by the elastic restoring force of each strip 5e. It is peeled off from 3a (that is, removed from the end face 3a) and returned to its original position.

  According to the arrangement configuration of the scraper 5, the scraper 5 is arranged so as to be movable in the drawing direction X of the raw tube 20, the opposite direction thereof, and the direction perpendicular to the drawing direction X. When visually inspecting, the scraper 5 is grasped with a hand or the like, and the scraper 5 is moved in a direction opposite to the drawing direction X of the raw tube 20 or the scraper 5 is moved in a direction perpendicular to the drawing direction X. The scraper 5 can be disposed at a position that does not hinder the inspection of the bearing portion 2c. Thereby, the bearing part 2c can be inspected easily.

  Further, the scraper 5 is suspended by an elastically expandable and contractible strip 5e, so that the scraper 5 can move in the drawing direction X of the raw tube 20, the opposite direction, and the direction perpendicular to the drawing direction X. Therefore, the scraper 5 can be configured to be movable in a predetermined direction (that is, the drawing direction X, the opposite direction, and the direction perpendicular to the drawing direction X) with a simple configuration.

  Further, when the inspection of the bearing portion 2c of the die 2 is completed, when the hand is released from the scraper 5, the scraper 5 is moved to the original position by the elastic restoring force of the strip 5e, so that the scraper 5 is surely returned to the original position. And can be easily returned.

  Moreover, since the scraper 5 is suspended by the elastically extendable strip 5e, it is necessary to strictly position the scraper 5 at the scraping position when the scraper 5 is disposed at the lubricating oil scraping position. There is an advantage that there is no.

  FIG. 15 is a diagram illustrating a third modification of the arrangement configuration of the scraper 5 in the apparatus 1 of the above embodiment.

  In this third modification, the scraper 5 is not permanently installed but is movable. That is, the apparatus 1 according to the third modification includes a scraper moving means 6 that moves the scraper 5 to a position where the lubricating oil is scraped upstream of the die 2 and the die holder 3 and a position different from the lubricating oil scraping position. I have.

  The scraper moving means 6 has a support plate 6 a as a support member that supports the scraper 5. A through hole (not shown) larger than the diameter D of the raw tube 20 is provided at the center of the support plate 6a. The scraper 5 is supported on the support plate 6a by fixing the scraper 5 to the outer periphery of the support plate 6a with a plurality of fixing screws 5g. Further, the support plate 6a is connected to the telescopic rod 6b of a fluid pressure cylinder (eg, hydraulic cylinder, gas cylinder). Then, by extending the rod 6b of the fluid pressure cylinder, the scraper 5 fixed to the support plate 6a is moved to the lubricating oil scraping position, and the rod 6b of the fluid pressure cylinder is shortened and supported. The scraper 5 fixed to the plate 6a is moved in a direction perpendicular to the drawing direction X and is arranged at a position different from the lubricating oil scraping position.

  When the blank tube 20 is not drawn, the scraper 5 is arranged at a position different from the lubricating oil scraping position. This prevents the bearing portion 2c from being covered with the scraper 5 when the bearing portion 2c of the die 2 is inspected. Therefore, the bearing part 2c can be easily inspected.

  When starting the drawing process of the raw tube 20, first, the scraper 5 is disposed at the lubricating oil scraping position by extending the rod 6b of the fluid pressure cylinder. Next, the blank tube 20 is drawn according to the drawing procedure described above.

  Although the embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment and a plurality of modified examples, and various modifications can be made.

  In addition, the manufacturing method and apparatus according to the present invention may be configured by combining two or more of the technical ideas applied to the embodiment and the plurality of modified examples.

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

[Examples 1 to 16]
As the aluminum base tube 20, an aluminum extruded base tube having a circular cross section obtained by extruding an aluminum billet was prepared. Aluminum billet is Mn: 1.12 mass%, Si: 0.11 mass%, Fe: 0.39 mass%, Cu: 0.16 mass%, Zn: 0.01 mass%, Mg: 0.02 mass% %, The balance being aluminum and inevitable impurities. The extrusion temperature is 520 ° C., and the extrusion speed is 5 m / min. Further, the outer diameter of the raw tube 20 is 32 mm, and the wall thickness is 1.5 mm.

  The raw pipe 20 is drawn by changing the drawing speed and the kinematic viscosity of the lubricating oil 8 by using the apparatus 1 of the above-described embodiment shown in FIGS. 21 was produced. The aluminum tube 21 has an outer diameter D of 24 mm and a wall thickness of 1 mm.

  In the apparatus 1 used for this drawing process, the approach angle θ1 of the die 2 is 60 °, and the bearing length L1 is 18 mm. Further, the plug 4 has an approach angle θ2 of 19 ° and a bearing length L2 of 1.2 mm. The scraper 5 is made of soft urethane rubber, and its hardness Hs is 70. Hs is a value measured with a spring type hardness meter A defined by JIS K6301. Further, the diameter E of the insertion hole 5b of the scraper 5 is set to −3% with respect to the outer diameter D of the raw tube 20, and the thickness T of the cutting edge portion 5a of the scraper 5 is 3 mm. The lubricating oil 8 used for the drawing process is of polybutene type. Further, the amount of the lubricating oil 8 ejected from the nozzle 7a is set to 3 L / min.

  And about the outer peripheral surface of the aluminum pipe 21 obtained by this drawing process, while examining the generation | occurrence | production state of an oil pit visually, surface roughness Ry was measured based on JISB0601. The results are shown in Table 1.

[Comparative Examples 1 to 16]
The blank tube 20 was drawn under the same drawing conditions as those of Examples 1 to 16 except that the scraper 5 was not used during the drawing process.

  And about the outer peripheral surface of the aluminum tube 21 obtained by this drawing process, the generation | occurrence | production state of the oil pit was investigated similarly to the said Examples 1-16, and surface roughness Ry was measured. The results are shown in Table 1.

  In the “oil pit” column in Table 1, the symbols ◎, ○, Δ, and × are written in order of increasing oil pits. In the “evaluation” column, symbols ◎, ○, and X are written in the order of good surface smoothness of the outer peripheral surface of the tube 21.

  The meanings of the symbols written in the “Remarks” column are as follows.

  * 1: Since the drawing speed is slow, the production efficiency of the pipe is poor, and therefore the production cost is high.

  * 2: Seizure occurred on the outer peripheral surface of the pipe.

  As shown in Table 1, it was confirmed that the surface smoothness of the outer peripheral surface of the pipe 21 can be improved by drawing the raw pipe 20 using the scraper 5.

  Furthermore, by setting the drawing speed to 10 m / min or more, the pipe 21 can be manufactured efficiently, and even when the drawing speed is set to a high speed in this way, the occurrence of oil pits is suppressed. It turns out that it can be.

Furthermore, by using the lubricating oil 8 having a kinematic viscosity of 400 mm ² / s or less (particularly desirably 200 mm ² / s or less), the oil pit can be reliably reduced, and the surface smoothness of the outer peripheral surface of the pipe 21 can be achieved. It was found that the property can be improved with certainty.

  INDUSTRIAL APPLICABILITY The present invention can be used for a method for manufacturing an aluminum tube for a photosensitive drum substrate used for a substrate of a photosensitive drum mounted on a copying machine, a laser printer, a facsimile machine, and the like and an apparatus for manufacturing the same.

FIG. 1 is a schematic overall view of an apparatus for producing an aluminum tube for a photosensitive drum substrate according to an embodiment of the present invention. FIG. 2 is a sectional view of the apparatus. FIG. 3 is a perspective view of the apparatus. FIG. 4 is a sectional view of a drawing die and a die holder of the apparatus. FIG. 5 is a side view of the drawing plug of the apparatus. FIG. 6 is a perspective view of a scraper of the apparatus. FIG. 7A is a perspective view showing a first modification of the scraper of the apparatus. FIG. 7B is a cross-sectional view of the scraper shown in FIG. 7A. FIG. 8 is a perspective view showing a second modification of the scraper of the apparatus. FIG. 9 is a perspective view showing a third modification of the scraper of the apparatus. FIG. 10 is a perspective view showing a fourth modification of the scraper of the apparatus. FIG. 11 is an enlarged cross-sectional view showing several modified examples of the cross-sectional shape of the blade edge portion of the scraper of the same device. FIG. 12 is a perspective view showing a first modification of the arrangement configuration of the scraper of the apparatus. FIG. 13 is a perspective view showing a second modification of the arrangement configuration of the scraper of the apparatus. FIG. 14 is a perspective view showing a state in the middle of the drawing process in the example shown in FIG. FIG. 15 is a perspective view showing a third modification of the arrangement configuration of the scraper of the apparatus. FIG. 16 is a perspective view showing a state in the middle of drawing an aluminum base tube using a high kinematic viscosity lubricating oil by a conventional method. FIG. 17 is a perspective view showing a state in the middle of drawing an aluminum base tube using a low kinematic viscosity lubricating oil by a conventional method.

Explanation of symbols

1: Photosensitive drum base aluminum tube manufacturing apparatus 2: Drawing die 2a: Upstream end face 2b: Die hole 2c: Bearing part 3: Die holder 3a: Upstream end face 5: Scraper 5a: Cutting edge part 5b: Insertion Hole 5c: Capture groove 5d: Cut 5e: Elastically expandable and contractible strip 5f: Scraper element 6: Scraper moving means 7: Lubricating oil adhering means 7a: Lubricating oil jet nozzle 8: Lubricating oil 9: Elementary tube driving means 10: scraper holding means 20 aluminum base tube 21: aluminum tube X: drawing direction

Claims (19)

While scraping the lubricating oil attached to the outer peripheral surface of the aluminum base pipe by the scraper disposed on the upstream side of the drawing die and spreading the lubricating oil on the outer peripheral surface of the base pipe in the circumferential direction, A method of manufacturing an aluminum tube for a photosensitive drum base body by drawing a base tube,
The scraper is provided with an insertion hole through which the raw tube is inserted, and the cutting edge of the scraper is formed from the outer peripheral edge of the insertion hole,
For the photosensitive drum base, characterized in that a catching groove for catching the lubricating oil scraped from the outer peripheral surface of the raw tube is provided on the side surface on the upstream side of the scraper blade tip portion, extending in the circumferential direction of the blade tip portion. A method for manufacturing an aluminum tube. Further, the scraper method of manufacturing a photoconductor drum substrate for an aluminum tube according to claim 1, wherein is divided around the insertion hole into a plurality of elements in the circumferential direction. The scraper is arranged at a position different from the lubricating oil scraping position on the upstream side of the die when the blank pipe is not drawn.
The method for producing an aluminum tube for a photosensitive drum substrate according to claim 1 or 2, wherein a scraper is disposed at a lubricating oil scraping position on the upstream side of the die when drawing of the raw tube is started. Scan scraper is permanent in the lubricating oil scraping position on the upstream side of the die,
3. The method for producing an aluminum tube for a photosensitive drum substrate according to claim 1 , wherein the scraper is detachably fixed to the upstream end surface of the die or the upstream end surface of the die holder holding the die. Scan scraper is aluminum for photoconductor drum substrate according to claim 1 or 2, wherein stuck to the moveable along the upstream end surface or removably and the end surface on the end surface of the upstream side of the die holder holding the dies of the die A method of manufacturing a tube. Scan scraper is on the upstream side of the die, the production of a photoconductor drum substrate for an aluminum tube according to claim 1 or 2, wherein is movably disposed and a direction perpendicular to the opposite direction and the drawing direction drawing direction of the mother tube Method.   The scraper is configured to be movable in a pulling direction of the raw tube, an opposite direction thereof, and a direction perpendicular to the pulling direction by being suspended by elastically stretchable strips. A method for producing an aluminum tube for a photosensitive drum substrate. The method for producing an aluminum tube for a photosensitive drum base according to any one of claims 1 to 7, wherein the diameter of the insertion hole of the scraper is set in a range of -5% to 0% with respect to the outer diameter of the raw tube. The method for producing an aluminum tube for a photosensitive drum base according to any one of claims 1 to 8 , wherein at least the cutting edge portion of the scraper is made of a soft material having a hardness Hs of 90 or less as measured by a spring type hardness tester A type. The method for producing an aluminum tube for a photosensitive drum substrate according to any one of claims 1 to 9 , wherein the material of the base tube is Al-Mn, Al-Mg, Al-Mg-Si, or pure aluminum. 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 aluminum base tube,
A drawing die,
A tube driving means for moving the aluminum tube in the drawing direction;
Lubricating oil adhering means for adhering drawing lubricating oil to the outer peripheral surface of the raw tube
A scraper disposed upstream of the die, and
The scraper scrapes off the lubricating oil adhering to the outer peripheral surface of the raw pipe that is moved in the drawing direction by the raw pipe driving means and spreads the lubricating oil on the outer peripheral surface of the raw pipe in the circumferential direction.
The scraper is provided with an insertion hole through which the raw tube is inserted, and the blade tip of the scraper is formed from the outer peripheral edge of the insertion hole,
For the photosensitive drum base, characterized in that a catching groove for catching the lubricating oil scraped from the outer peripheral surface of the raw tube is provided on the side surface on the upstream side of the scraper blade tip portion, extending in the circumferential direction of the blade tip portion. Aluminum pipe manufacturing equipment. Further, the scraper photoconductor drum substrate for an aluminum tube manufacturing apparatus according to claim 11, characterized in that circumferentially divided into a plurality of elements around the insertion hole. Scraper moving means for moving the scraper to the lubricating oil scraping position on the upstream side of the die and the position different from the lubricating oil scraping position,
The scraper moving means moves the scraper to a position different from the lubricating oil scraping position on the upstream side of the die when the blank pipe is not drawn, and the scraper moves to the die when starting the blank pipe drawing process. The apparatus for producing an aluminum tube for a photosensitive drum substrate according to claim 11 or 12 , wherein the apparatus is moved to a position for scraping the lubricating oil upstream of the photosensitive drum substrate. Scan scraper is permanent in the lubricating oil scraping position on the upstream side of the die,
13. The apparatus for producing an aluminum tube for a photosensitive drum substrate according to claim 11 or 12 , wherein the scraper is detachably fixed to the upstream end face of the die or the upstream end face of the die holder holding the die. Scan scraper is aluminum for photoconductor drum substrate according to claim 11 or 12, wherein stuck to the moveable along the upstream end surface or removably and the end surface on the end surface of the upstream side of the die holder holding the dies of the die Pipe manufacturing equipment. Scan scraper is for spread the lubricant with scrape lubricant adhering to the outer peripheral surface of the blank tube that is moved in the drawing direction by base pipe drive means in the circumferential direction on the outer peripheral surface of the blank tube,
13. The aluminum tube for a photosensitive drum substrate according to claim 11 or 12 , wherein the scraper is arranged on the upstream side of the die so as to be movable in the drawing direction of the tube, in the opposite direction and in the direction perpendicular to the drawing direction. Manufacturing equipment. Scraper, by being suspended by elastically stretchable strip member according to claim 16 has been made as to be movable in the drawing direction of the mother tube and the opposite direction is the direction perpendicular to the drawing direction An apparatus for producing an aluminum tube for a photosensitive drum substrate. 18. The apparatus for producing an aluminum tube for a photosensitive drum substrate according to claim 11, wherein the diameter of the insertion hole of the scraper is set in a range of −5% to 0% with respect to the outer diameter of the raw tube. The apparatus for producing an aluminum tube for a photosensitive drum base according to any one of claims 11 to 18 , wherein at least the cutting edge portion of the scraper is made of a soft material having a hardness Hs of 90 or less as measured by a spring type hardness tester A type.

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