JP2008183662A - Cylinder machining device and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cylinder machining device with high surface accuracy and its machining method not leaving uneven cutting marks comprising a plurality of cycles after the cylinder surface is cut, or not forming images including periodic marks after the cylinder is manufactured as a photosensitive drum. <P>SOLUTION: This cylinder machining device has a cylinder holding means for holding a cylinder to be machined, a cutting member positioning and turning means for positioning a cutting member into contact with a surface of the cylinder and turning it around the axis of the cylinder, a cutting member moving and holding means for holding the cutting member movably in an axial direction of the cylinder, a cutting member moving means for moving the cutting member, and a connection means for connecting the cutting member moving and holding means with the cutting member moving means. The connection means restrains the mutual positions of the cutting positioning and turning means and the cutting member moving means in the axial direction of the cylinder using fluid pressure, and connects the cutting member positioning and turning means with the cutting member moving means so that their mutual positions can freely move on a cross section perpendicular to the axis of the cylinder. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a cylindrical body processing apparatus and a processing method thereof. More specifically, the present invention relates to an apparatus for processing a cylindrical body used as an electrophotographic photosensitive drum and a developing sleeve in an image forming apparatus such as an electrophotographic copying machine, a laser beam printer, a facsimile machine, and a printing machine, and a processing method thereof. About.

  Conventionally, a cylindrical body finished with a predetermined surface accuracy and dimensional accuracy has been used as an electrophotographic photosensitive drum and a developing sleeve in an image forming apparatus such as an electrophotographic copying machine, a laser beam printer, a facsimile machine, and a printing machine. Yes. An electrophotographic photosensitive drum is manufactured by applying a photosensitive film to the surface of such a cylindrical body (drum base). However, if the surface accuracy or dimensional accuracy of the cylindrical body is low, the photosensitive film has irregularities, which causes image formation. Defects occur in the image formed by the device. Therefore, in order to obtain a highly accurate image, it is required that the surface of the cylindrical body be processed to a predetermined surface roughness. In addition, extremely high accuracy is required for dimensional accuracy such as straightness and roundness.

  In general, as a cylindrical material processed into an electrophotographic photosensitive drum, a developing sleeve, or the like, a Cu—Al alloy containing 99.5% or more purity Al or 0.05 to 0.20% Cu is used. . Moreover, Cu-Mn-Al alloy containing 0.05-0.20% Cu and 1.0-1.5% Mn, 0.20-0.60% Si and 0.45-0. A Si—Mg—Al alloy containing 90% Mg is also used. As a processing method of such a cylindrical body, generally, a tube material with high surface accuracy and dimensional accuracy is first manufactured by performing extrusion, drawing and bending correction, etc., and cutting it into a desired length. In addition, there is a method of chamfering both ends.

  As a general method for processing a cylindrical body to finish a cylindrical surface having a predetermined surface roughness, there is the following method. First, a tubular body manufactured by extrusion molding or pultrusion molding is cut into a desired length to manufacture a cylindrical body. Next, the edge portions are formed by cutting both end portions in the circumferential direction on both end surfaces with reference to the center of the inner diameter or the outer diameter of the cylinder. A holder having a taper-shaped clamp surface is inserted into this and held in the axial direction of the cylinder to hold the cylinder, or a holding member such as an open clamp is inserted and held inside the cylinder. Then, a cutting member such as a cutting tool is brought into contact with the outer peripheral surface of the cylindrical body, and then the cylindrical body is rotated to perform cutting. In addition, for the purpose of increasing the cutting efficiency of the outer peripheral surface, a shallow groove continuous in the axial direction is provided on the surface of the cylindrical body, and the surface of the cylindrical body is cut by turning the cutting member around the central axis of the cylinder at high speed. A method (see Patent Document 1) has also been developed.

  In such a method of cutting the outer peripheral surface of the cylindrical body with a cutting member to finish the cylindrical body surface with a predetermined surface roughness, there are not a few cutting traces. The depth of this cutting trace basically follows the curvature and cutting pitch of the cutting member tip shape, but this cutting pitch is the width of the cutting trace, the speed at which the cutting member advances in the axial direction of the cylinder, and the rotation of the cylinder It is determined by the speed or the turning speed of the cutting member. Therefore, when it is required to process with the surface roughness of the cutting trace kept low, processing is performed by increasing the curvature of the cutting member tip shape or setting the cutting pitch short. In particular, when it is desired to maximize the curvature of the cutting member tip shape, a cutting member having a curvature shape at the tip, commonly called a flat tool, is often used.

  In setting the cutting speed, that is, the rotational speed of the cylindrical body or the turning speed of the cutting member, the following can be said. That is, because there are individual differences in the shape and rotational balance of the cylindrical body, cutting is performed by turning the cutting member around the axis of the cylindrical body by providing a cutting member in the turning mechanism rather than rotating the cylindrical body for cutting. It is possible to adjust the turning balance better. This makes it possible to swivel at a very high rotational speed and thus to obtain a high cutting speed. Therefore, it is possible to further reduce the processing cost by the method of turning the cutting member around the axis of the cylindrical body for cutting. Further, in order to process the surface of the cylindrical body over the entire circumference, the following is also required in the method of rotating the cylindrical body around the axis or the method of rotating the cutting member around the axis of the cylindrical body. . That is, in both cases, it is required to change the positional relationship between the cylindrical body and the means for positioning the cutting member so as to contact the surface of the cylindrical body (hereinafter referred to as cutting member holding means) in parallel to the central axis of the cylindrical body. It is done. In other words, either one or both of the cylindrical body holding means and the cutting member holding means is required to be positioned with a slide mechanism in a direction parallel to the axis of the cylindrical body. Further, when both the cylindrical body holding means and the cutting member holding means are slid, they are mounted on a common slide mechanism or provided with different slide mechanisms so that their movement trajectories are parallel to each other. It is common to have.

  Further, as a method of moving the cylindrical body whose position is regulated by the guide rail or the guide shaft or the cutting member holding means, there are the following methods. That is, it is a method of moving a ball screw provided with a helical thread groove by rotating it with an electric motor, an air motor, a vibration motor or the like. In addition, a method of moving a pneumatic power such as a rod air cylinder or a rodless air cylinder by directly acting in a moving direction is also common. In the method of moving the cylindrical body or the cutting member holding means using the slide mechanism, particularly the guide rail or the ball screw, the positional change between the cylindrical body and the cutting member holding means in the cylindrical body axial direction is on a completely straight line. It is preferably done by movement. Specifically, it is desirable to have the following mechanism. That is, a highly accurate track such as a guide rail or a guide shaft is prepared. It is called a slider that joins cylindrical body holding means or cutting member holding means so that it can freely move on the guide rail or guide shaft through a bearing or the like built in so that it can circulate a plurality of balls and rollers. Fix to the sliding member. In general, it is possible to procure guide rails and guide shafts having very high smoothness. However, when the guide rail or guide shaft and the slider slide in the linear direction, there is a small operating gap due to the dimensional difference between the individual balls or rollers incorporated in the bearing as described above. Resulting in.

  On the other hand, in the case of the above-described ball screw, there is a slight flare included in the processing of the helical thread groove, and an operation gap similar to the bearing portion of the slider exists also in the bearing portion. Accordingly, there is a considerable amount of flutter due to the rotation operation, and in particular, when the ball screw is rotated at a high rotation speed or rotated at a specific rotation speed, stronger vibration due to resonance or the like may be generated. Such vibration is transmitted to the cylindrical body holding means or the cutting member holding means regardless of the magnitude of the amplitude, and the components acting in the direction perpendicular to the axis of the cylindrical body are the cutting member and the cylindrical body. This affects the contact depth and changes the machining depth. The vibration period is synchronized with the rotation of the ball screw because the cause of the vibration is the rotation of the ball screw. However, under general cutting conditions, the rotational speed of the cylindrical body or the turning speed of the cutting member is very high compared to the moving speed of the cylindrical body and the cutting member holding mechanism in the axial direction of the cylindrical body. As a result, the pitch at which the machining depth changes due to the vibration and the pitch of the original cutting trace are not synchronized, and non-uniformity is generated in the final machining trace.

  In recent electrophotographic photosensitive drums, there is a demand for a thinner coating film for the purpose of higher image quality formation, particularly high resolution and ghost resistance, or cost reduction. Therefore, not only the surface roughness of the drum base surface is kept low, but also higher uniformity of the cutting trace is important. On the other hand, the non-uniform cutting marks cause image unevenness and are not preferable in terms of visual appearance as a product.

As a method for avoiding such influences, generally, a method of reducing vibration by using a resin coupling or the like for a ball screw positioning part or a connection part with a motor and making it difficult to transmit the vibration to other connection devices. Is used. In addition, a method of absorbing vibration by connecting a ball screw and the cylindrical body holding means or cutting member holding means through a bearing structure using a spherical member has been proposed (see Patent Document 2).
Japanese Patent Laid-Open No. 06-328303 JP 2000-107971 A

  However, the above-described method for mitigating vibration using a resin coupling or the like for the ball screw positioning part or the motor connection part has the following problems. That is, it is possible to mitigate the vibration caused by the ball screw's vibration, but as described above, the vibration component generated by the minute operation gap existing in the bearing portion of the slider is not significantly relieved.

  Further, the method for absorbing vibration by the bearing structure using a spherical member at the time of connection also has the following problems. In other words, in the actual mechanism, it is required to secure and hold the spherical member in a predetermined position, that is, in a state with an extra space that is always movable in the direction of vibration. In order to do so, the position of the sphere must be regulated by providing a depression in the contact portion of the sphere or by applying a bush or the like. Therefore, although this method can be expected to absorb vibration as a bearing structure by the rotation of a basic sphere, since the spherical member cannot be rotated completely without load, significant vibration relaxation cannot be expected.

  Here, the influence of the vibration caused by the ball screw operation on the contact depth of the cutting member due to the component acting in the direction perpendicular to the axis of the cylindrical body is different in each of the two types of cutting methods described above. The degree to which it affects is different. That is, with the method of cutting by rotating the cylindrical body after bringing the cutting member into contact with the outer peripheral surface, and the method of cutting the surface of the cylindrical body by rotating the cutting member around the central axis of the cylinder, The impact is different.

  First, the case where the method of cutting by rotating a cylindrical body is used is demonstrated. In this case, since the position of the cutting member and the cutting depth direction to be cut are fixed with respect to the generated vibration, if the cutting member is arranged so that the above-described vibration direction and the machining depth direction are orthogonal, the vibration When the cutting member comes into contact with the surface of the cylindrical body, the effect of is exerted in the tangential direction. Therefore, the change to the processing depth can be continuously reduced. Therefore, it is not required to completely eliminate the vibration of the ball screw. Therefore, for example, when the ball screw and the cylindrical body holding means or the cutting member holding means are connected, a certain effect can be obtained by using a method of absorbing vibration through a bearing structure using a spherical member. You can expect.

  On the other hand, in the method of cutting the surface of the cylindrical body by rotating the cutting member around the central axis of the cylinder, the cutting member is always swiveled during processing. Therefore, the vibration direction and the machining depth direction of the cutting member are repeated when they are orthogonal to and parallel with the rotation of the cutting member, which is continuous like a method of cutting by rotating the cylindrical body. Cannot be reduced. Therefore, in order to obtain the substrate surface required for the recent electrophotographic photosensitive drum as described above, a more reliable vibration absorbing mechanism is required.

  The present invention has been made in view of the above problems. It is an object of the present invention to maintain surface accuracy without leaving a non-uniform cutting trace having a plurality of cycles after cutting a cylindrical body surface or forming an image including a periodic trace after being produced as a photosensitive drum. An object of the present invention is to provide a high cylindrical body processing apparatus and a processing method thereof.

  The present invention provides a cylindrical body holding means for holding a cylindrical body to be processed, a cutting member positioning and turning means for positioning the cutting member so as to contact the surface of the cylindrical body and turning around the axis of the cylindrical body, and the cutting Cutting member moving and holding means for holding the member movably in the axial direction of the cylindrical body, cutting member moving means for moving the cutting member, and connection for connecting the cutting member moving and holding means and the cutting member moving means A cylindrical body processing apparatus, wherein the connection means restrains the positions of the cutting member positioning swiveling means and the cutting member moving means in the axial direction of the cylindrical body using fluid pressure. And a means for connecting the cutting member positioning swiveling means and the cutting member moving means so that they can move freely on a cross section perpendicular to the axis of the cylindrical body. .

  Further, the present invention provides a cylindrical body holding means for holding a cylindrical body to be processed, a cutting member positioning and turning means for positioning the cutting member so as to contact the surface of the cylindrical body and turning around the axis of the cylindrical body, A cylindrical body movement holding means for holding the cylindrical body movably in the axial direction of the cylindrical body, a cylindrical body movement means for moving the cylindrical body, and the cylindrical body movement holding means and the cylindrical body movement means are connected. A cylindrical body processing apparatus having at least a connecting means, wherein the connecting means uses fluid pressure to position the cylindrical body moving holding means and the cylindrical body moving means in the axial direction of the cylindrical body. It is a means for restraining and connecting the cylinder body movement holding means and the cylinder body movement means so that the mutual positions of the cylinder body movement means and the cylinder body movement means can be freely moved on a cross section orthogonal to the axis of the cylinder body.

  Further, the present invention is characterized in that a gas is used as the fluid.

  Further, according to the present invention, the connecting means includes a fluid supply port into which a fluid is injected and at least two static pressure pads provided with holes for allowing the injected fluid to pass therethrough. The pads are arranged to face each other so as to sandwich at least a part of the cylindrical body movement holding means. Alternatively, the connection means includes a fluid supply port through which fluid is injected and at least two static pressure pads provided with holes for allowing the injected fluid to pass therethrough, the static pressure pad being the cylinder. It is arranged to face each other so as to sandwich at least a part of the arm fixed to the body movement holding means.

  The inner diameter cross-sectional area of the hole of the static pressure pad is 0.5% or more and 15% or less with respect to the area of the cross section perpendicular to the hole of the static pressure pad. Further, the inner diameter and the length of the hole of the static pressure pad are in a relationship in which the length is in the range of 1 to 50 times the inner diameter. The hydrostatic pad is a porous member made of a porous mineral or a foamed resin.

  Furthermore, the present invention relates to a cylindrical body machining method for performing machining by moving the cutting member in the axial direction of the cylindrical body while turning the cutting member around the axis of the cylindrical body. A processing apparatus that moves along a cylindrical body is used for processing the cylindrical body.

  Furthermore, the present invention is a processing method of a cylindrical body that performs processing by moving the cylindrical body relative to the cutting member in the axial direction of the cylindrical body while turning the cutting member around the axis of the cylindrical body. A processing apparatus in which the cylindrical body moves along the axis of the cylindrical body is used for processing the cylindrical body.

  In addition, this invention is a cylindrical body processed by the said processing method. A photosensitive drum is manufactured using the cylindrical body as a base.

  According to the present invention, the surface accuracy without leaving non-uniform cutting traces having a plurality of different cycles after cutting the cylindrical surface or forming an image including periodic traces after being produced as a photosensitive drum. High cylindrical body can be produced.

  The best mode for carrying out the present invention will be described below in detail with reference to the drawings, but the present invention is not limited thereto.

  FIG. 1 shows one embodiment of a cylindrical body processing apparatus according to the present invention. It is a processing apparatus that performs processing by moving the cutting member in the axial direction of the cylindrical body while turning the cutting member around the axis of the cylindrical body. On the pedestal 7, a cylindrical body holding means (holding tool 1) that holds the cylindrical body 8 that is a workpiece in a predetermined position, and a ball screw rotating unit 11 are fixed. The ball screw rotating unit 11 is a member that holds and rotates the cutting member moving means (ball screw 6) that moves the cutting member so as to be parallel to the cylindrical central axis of the cylindrical body 8. Further, the guide rail 4 is fixed to the base 7 so that the sliding track is parallel to the cylindrical central axis of the cylindrical body 8 held by the holder 1. In addition, a cutting member moving and holding means (cutting unit base 12) for holding the cutting member movably in the axial direction of the cylindrical body 8 via the slider 10 slides on the guide rail 4 in a direction parallel to the central axis of the cylinder. Connected as possible.

  FIG. 2 shows a cross section orthogonal to the cylindrical central axis of the cylindrical body 8 of the processing apparatus of FIG. In this case, the cutting unit base 12 holds the cutting member 9 so as to come into contact with the outer surface of the cylindrical body 8, and the cutting member positioning and turning means (cutting member rotation) rotates the cutting member 9 about the cylindrical central axis of the cylindrical body 8. Built-in unit 3). The cutting member 9 is composed of one rough bit and one finishing bit, and the rough bit and the finishing bit are each attached to the opposite side of the cutting member rotating unit 3 around the cylindrical central axis of the cylindrical body 8. Therefore, by performing the cutting process stepwise, the cutting load can be dispersed and the machining can be performed smoothly.

  At the same time, the lower end portion of the cutting unit base 12 is constrained to the ball screw 6 via the connecting means (connecting member 5). Then, the cutting unit base 12 moves on the track of the guide rail 4 by the ball screw 6 subjected to the rotating action of the ball screw rotating unit 11.

  As shown in FIG. 3 illustrating the connecting member 5 in detail, the connecting member 5 is provided with a fluid supply port 5a into which a high-pressure fluid is injected. The means for supplying fluid to the fluid supply port 5a is not shown in the figure, but is not particularly limited as long as a predetermined supply pressure can be obtained, such as a liquid feed pump, an air compressor, or a gas cylinder.

  Here, the fluid injected from the fluid supply port 5a may be a liquid such as water, a volatile solvent, or oil, or may be a gas such as air or nitrogen gas. Compared to the case of using a liquid, there is no need for a mechanism for collecting the liquid with a receiving pan or the like. Furthermore, it is preferable to select and use air as the gas because the equipment can be operated cheaply and safely as compared with the case of using other gases. Accordingly, in the following description, air will be described as an example for the fluid.

  Moreover, you may provide the static pressure pads 5a and 5c which have a hole in opposition so that the said cutting member movement holding means (cutting unit base 12) may be pinched | interposed. In this case, the injected air is discharged toward the cutting unit base 12 through the static pressure pads 5b and 5c. The cutting unit base 12 is constrained by the connecting member 5 in a direction parallel to the cylindrical central axis of the cylindrical body 8 by being sandwiched between the high-pressure air. Here, in the supply of fluid such as air, the higher the pressure, the higher the restraint force, that is, the accuracy of position regulation. In particular, when the pressure is 0.1 MPa or more, the drive of the ball screw 6 moves the cutting unit base 12 very accurately. The effect on the cutting result is small.

  The static pressure pads 5b and 5c are respectively a surface through which air flows and a surface through which the air flows from the fluid supply port 5a through which high-pressure air is injected toward the cutting unit base 12 as described above. And a block of a predetermined size provided with holes that connect the both surfaces, or pores that are substantially equally spaced at equal intervals and that are opened in parallel to each other, and air is supplied to the cutting unit base 12. Disperse uniformly toward the surface and release. The material of the static pressure pads 5b and 5c is not particularly limited as long as pore processing such as metal, resin, or mineral is possible. The function of the pores is to generate an appropriate pressure loss when the supplied air passes through the static pressure pad, and to uniformly disperse the air when it is discharged toward the cutting unit base 12. In the pore processing, the ratio of the inner diameter cross-sectional area of the pore to the area of the cross section perpendicular to the pore of the static pressure pad is particularly important. That is, the inner diameter sectional area of the pores is preferably 0.5% or more and 15% or less with respect to the sectional area of the static pressure pad. Also, if the inner diameter cross-sectional area of the pore is 15% or less with respect to the cross-sectional area of the static pressure pad, the pressure loss necessary for uniform dispersion can be obtained when the supplied air passes through the static pressure pad. In addition, when the inner diameter cross-sectional area of the pores is less than 0.5% with respect to the cross-sectional area of the static pressure pad, the pressure loss when the supplied air passes through the static pressure pad Is unnecessarily capital investment, and there is no choice but to select an excessive supply capacity of the air supply device, and an unnecessary capital investment such as providing a pressure-resistant mechanism corresponding to the air supply path from the air supply device to the static pressure pad. Will increase. In addition, when a fluid such as air passes through a hole having a length, a predetermined pressure loss is caused depending on the inner diameter and length of the fluid. This is an important factor in securing the appropriate pressure loss. That is, the length of the hole is preferably in the range of 1 to 50 times the inner diameter. Since the pressure loss of the fluid passing through the hole increases in proportion to the length of the hole, in the configuration of the present invention, if the length of the hole is 50 times or less than the inner diameter, the pressure loss is excessive. It can be kept in an appropriate range. In addition, it is preferable that the length of the hole is 1 time or more with respect to the inner diameter in order to secure the strength of the static pressure pad itself as a housing.

  Therefore, when the connecting member 5 receives the rotational action of the ball screw rotating unit 11 and moves the cutting unit base 12, the cutting unit base 12 is only in the direction parallel to the guide rail 4 and the cylindrical central axis of the cylindrical body 8. Move according to position restrictions. However, since the cutting unit base 12 is restrained by the connecting member 5 through the high-pressure air as described above, the direction perpendicular to the cylindrical central axis of the cylindrical body 8 is only in accordance with the regulation of the guide rail 4. The position will be determined. As shown in FIG. 2, the connecting member 5 is connected to an anti-rotation guide shaft 5 k fixed in parallel to the guide rail 4, so that it does not rotate with the rotation of the ball screw 6. In addition, a minute gap is provided in the connecting portion between the connecting member 5 and the rotation prevention guide shaft 5k so that the connecting member 5 and the rotation preventing guide shaft 5k can slide with each other. In some cases, vibration in a direction perpendicular to the axis of the cylindrical body 8 may be generated. However, this vibration also causes the operation of the cutting unit base 12 to move in the direction perpendicular to the cylindrical central axis of the cylindrical body 8 by the mechanism in which the connecting member 5 restrains the cutting unit base 12 through the high-pressure air. There is no.

  Further, as the static pressure pads 5b and 5c, porous static pressure pads shown as 5d and 5e in FIG. 4, that is, a porous member such as porous mineral or foamed resin processed into a predetermined shape is used. May be. Since such a porous member originally has pores arranged substantially evenly, it has an effect close to that of the static pressure pad as described above, that is, the one that disperses the air passing through the pores by processing. And can be procured relatively inexpensively.

  Next, another embodiment of the present invention will be described. As shown in FIG. 5, it is a processing apparatus for processing by moving the cylindrical body relative to the cutting member in the axial direction of the cylindrical body while turning the cutting member around the axis of the cylindrical body. In the processing apparatus shown in FIG. 5, the cylinder body 8 is held in a predetermined position by the cylinder body movement holding means (the cylinder body holding base 2) that holds the cylinder body 8 so as to be movable in the axial direction of the cylinder body 8. The body holding means (holding tool 1) is fixed. The guide rail 4 is fixed on the pedestal 7 and connected to the guide rail 4 via the slider 10 so that the cylindrical body holding base 2 can slide in a direction parallel to the cylindrical central axis of the cylindrical body 8. Has been. Similarly, a ball screw rotating unit 11 for holding and rotating a cylindrical body moving means (ball screw 6) for moving the cylindrical body on the base 7 so as to be parallel to the cylindrical central axis of the cylindrical body 8, and a cutting unit base 12 , Has been fixed.

  Further, the cutting unit base 12 positions the cutting member 9 so as to contact the outer surface of the cylindrical body 8, and includes a cutting member holding and turning means (cutting member rotating unit 3) for turning around the central axis of the cylindrical body 8. Built-in. At the same time, the cylindrical body holding base 2 is connected to the ball screw 6 via the connecting means (connecting member 5), which moves on the track of the guide rail 4 according to the rotating action of the ball screw rotating unit 11. The connection member 5 employs the same mechanism as that of the embodiment shown in FIGS. 2, 3, and 4. Similarly, the static pressure pads 5b and 5c facing each other so as to sandwich the arm 13 fixed to the cylindrical body movement holding means (cylindrical body holding base 2) by the static pressure pads 5b and 5c. It is restrained by the connection member 5 by the air of high air pressure. Thereby, the above-described effects can be obtained even in this embodiment.

  The cylindrical body processed by the processing apparatus of the present invention can be used for various applications. For example, it can be used as a substrate for a photosensitive drum of an electrophotographic copying machine, laser beam printer, facsimile, or printing apparatus. When used as a photosensitive drum, a charge generation layer or the like may be formed on the cylindrical body by a dip coating method or the like.

  Examples of the present invention will be described below, but the present invention is not limited to these examples. Further, the cutting member will be referred to as a cutting tool.

(Example 1)
In this example, a photosensitive drum was manufactured according to the present invention.

  First, as a cylindrical body, an aluminum drawn cylindrical body (material A6063) having an outer diameter of φ30.10 mm and an inner diameter of φ28.50 mm is cut into a cylindrical body length of 260 mm, and the inner surface in the vicinity of both ends is cut to a taper of 45 °. Surface was given. Then, four shallow grooves having a depth of 0.02 mm to 0.04 mm were evenly arranged at a pitch of about 90 ° using a cutter in the generatrix direction of the outer surface of the cylindrical body.

  Subsequently, with the cutting apparatus shown in FIG. 1, a static pressure pad was built in the connection member 5 and surface processing was performed under the following conditions. In the processing of the static pressure pad, a square plate block having a thickness of 6 mm and a front and back surfaces of 20 mm × 20 mm was prepared using iron (S45C), and φ0.2 mm in the thickness direction thereof. The fine holes were penetrated at a pitch of 0.7 mm in length and width. The air supplied to this static pressure pad was 0.8 MPa. The cutting margin of each cutting tool was aimed at the cutting depth of the cutting tool on the basis of the cylindrical body surface before cutting.

Roughing tool Material: Sintered diamond Tip R: 0.2mm
Rough cutting bite removal: 40μm

Finishing tool Material: Single crystal diamond Tip R: 8.0mm
Finish bite removal: 10μm

Distance between roughing tool and finishing tool: 1.5mm
Rotational speed: 14,000 rpm
Ball screw pitch: 1.0 mm
Ball screw rotation speed: 985 rpm
Cutting feed rate: 0.07mm / reV
Cutting oil: White kerosene 0.025cc / sec

  The roughness of the cylindrical surface after the cutting process was measured using a surface roughness measuring machine (Surfcoder SE-3300 manufactured by Kosaka Laboratory), measuring speed 0.5 mm / second, measuring length 2.5 mm, cut-off. When measured at 0.8 mm, Ry was 0.20 μm.

  Next, 10 parts of polyamide resin (trade name: Amilan CM8000, manufactured by Toray Industries, Inc.) and 12 parts of methoxymethylated 6 nylon resin (trade name: Toresin EF-30T, manufactured by Teikoku Chemical Co., Ltd.) were prepared. A coating material in which these resins are dissolved in a mixed solvent of 300 parts of methanol and 250 parts of n-butanol is applied to the cylindrical body by a dip coating method and dried with hot air at 95 ° C. for 15 minutes, whereby the film thickness is 0.5 μm. An undercoat layer was formed.

  Next, a solution comprising 7 parts of chlorogallium phthalocyanine, 3 parts of polyvinyl butyral resin (trade name: BX-1, manufactured by Sekisui Chemical Co., Ltd.) and 60 parts of cyclohexanone was prepared. The chlorogallium phthalocyanine has strong peaks at 7.4 °, 16.6 °, 25.5 ° and 28.2 ° in the Bragg angle (2θ ± 0.2 °) in the characteristic X-ray diffraction of CuKα. ing. The solution was dispersed in a sand mill using 1 mmφ glass beads for 8 hours, and then 100 parts of ethyl acetate was added to prepare a dispersion for a charge generation layer.

  This dispersion was applied on the intermediate layer by a dip coating method, and dried by heating at 95 ° C. for 10 minutes to form a charge generation layer. The film thickness of the charge generation layer was 0.18 μm.

  Next, 8 parts of an amine compound of the following structural formula,

  2.5 parts of an amine compound of the following structural formula,

And 10 parts of bisphenol Z-type polycarbonate resin (trade name: Iupilon Z-200, manufactured by Mitsubishi Gas Chemical Company) were dissolved in a mixed solvent of 80 parts of monochlorobenzene and 20 parts of dimethoxymethane. This paint was applied by a dip coating method and dried at 125 ° C. for 1 hour to form a charge transport layer having a film thickness of 11 μm, thereby forming a photosensitive drum.

  The same process as described above was repeated to produce 20 photosensitive drums.

(Example 2)
5 was processed in the same manner as in Example 1 except that the connecting member 5 shown in FIG. 3 was used to process the photosensitive drum. When the roughness of the cylindrical body surface after the cutting process was measured with the same surface roughness meter as in Example 1, Ry was 0.19 μm.

  The same steps as in Example 1 were repeated to prepare 20 photosensitive drums.

(Comparative Example 1)
1 was processed in the same manner as in Example 1 except that the cutting apparatus shown in FIG. 1 used the bearing mechanism using the spherical member shown in FIG. 6 as the connecting member 5 in FIG. A photosensitive drum was prepared. In addition, when the roughness of the cylindrical body surface after the end of cutting was measured with the same surface roughness meter as in Example 1, Ry was 0.26 μm. The same steps as in Example 1 were repeated to prepare 20 photosensitive drums.

  At this time, in the bearing mechanism shown in FIG. 6, hard balls having a spherical diameter of 9 mm made of high carbon chrome steel (SUJ2, hardness HrC62) are used as rolling elements 5g and 5h as spherical members, and these are used as brass bushes 5i and 5j. It was built in the connection member 5 via Further, the bush 5i behind the cutting feed on the left side of FIG. 6 is closed to hold the rolling elements 5g. The bush 5j in front of the cutting feed on the right side in the drawing incorporates a disc spring 5f. By the disc spring 5f, the rolling element 5h always presses the cutting unit base 12 and the rolling element 5g, so that the rolling elements 5g and 5f can stably come into contact with the cutting unit base 12. The pressurizing force of the disc spring 5f was 125 kgf.

(Comparative Example 2)
At the time of cutting, everything was processed in the same manner as in Example 1 except that a bearing mechanism using a spherical member similar to Comparative Example 1 was used for the connecting member 5 in FIG. A photosensitive drum was created. When the roughness of the cylindrical body surface after the cutting process was measured with the same surface roughness meter as in Example 1, Ry was 0.25 μm. The same steps as in Example 1 were repeated to prepare 20 photosensitive drums.

(Evaluation)
When the surface state was inspected by observing the appearance of the photosensitive drum prepared as described above, only the cutting pitch was recognized for the photosensitive drums of Examples 1 and 2, and other periodic traces were not found. It was. On the other hand, in the photosensitive drums of Comparative Examples 1 and 2, in addition to the cutting pitch, a stripe pattern having the same interval as the ball screw pitch (almost regularly 1.0 mm interval) was partially confirmed.

  Next, all the produced photosensitive drums were mounted on a printer Laser Jet 4000 manufactured by Hewlett-Packard Co., and a black image and a halftone image were output and image evaluation was performed. In the halftone image, one black line and two white lines are alternately continued. These black lines and white lines are perpendicular to the cylindrical central axis of the photosensitive drum, and are orthogonal to each other. What was scanned in the horizontal direction which is the direction was used. The numbers in the table indicate the number of individuals in the image in which periodic streaks with an interval of approximately 1.0 mm were observed in the direction perpendicular to the cylindrical central axis of the photosensitive drum. The results are shown in Table 1.

  As shown in the table, the photosensitive drum using the cylindrical body processed by the processing apparatus and the processing method according to the present invention as a substrate has a periodicity in both the first and second embodiments in all image tests. No streak was found. On the other hand, in the prior art employing the bearing mechanism using the spherical member shown in FIG. 6 as the connecting member, both the vertical halftone image and the horizontal halftone image in both Comparative Example 1 and Comparative Example 2. Individuals with periodic streaks were observed.

1 is a side elevational view of one embodiment of a cylindrical body processing apparatus in accordance with the present invention. It is a cross-sectional view of the cylindrical body processing apparatus of FIG. It is a figure which shows the detail of the connection member of this invention using a static pressure pad. It is a figure which shows the detail of the connection member of this invention using the static pressure pad which consists of a porous member. It is a figure which shows another embodiment of the cylindrical body processing apparatus according to this invention. It is a figure which shows the detail of the connection member using the rolling element of a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Holder 2 Cylindrical body holding base 3 Cutting member rotation unit 4 Guide rail 5 Connection member 5a Fluid supply port 5b, 5c Static pressure pad 5d, 5e Porous static pressure pad 5f Belleville spring 5g, 5h Rolling element 5i, 5j Bush 5k Anti-rotation guide shaft 6 Ball screw 7 Base 8 Cylindrical body 9 Cutting member 10 Slider 11 Ball screw rotating unit 12 Cutting unit base 13 Arm

Claims (12)

A cylindrical body holding means for holding a cylindrical body to be processed; a cutting member positioning and turning means for positioning the cutting member so as to contact the surface of the cylindrical body and turning about the axis of the cylindrical body; and the cutting member for the cylinder A cutting member moving and holding means for holding the cutting member so as to be movable in the axial direction of the body, a cutting member moving means for moving the cutting member, and a connecting means for connecting the cutting member moving and holding means and the cutting member moving means. A cylindrical processing apparatus having at least
The connecting means restrains the positions of the cutting member positioning swiveling means and the cutting member moving means in the axial direction of the cylindrical body using fluid pressure, and the cutting member positioning swiveling means and the cutting member moving means An apparatus for processing a cylindrical body, characterized in that it is means for connecting the positions so that they can move freely on a cross section perpendicular to the axis of the cylindrical body. A cylindrical body holding means for holding a cylindrical body to be processed; a cutting member positioning turning means for positioning the cutting member so as to contact the surface of the cylindrical body and turning about the axis of the cylindrical body; and the cylindrical body as the cylinder At least a cylindrical body movement holding means that holds the cylinder body so as to be movable, a cylindrical body movement means that moves the cylindrical body, and a connection means that connects the cylindrical body movement holding means and the cylindrical body movement means. A cylindrical body processing apparatus comprising:
The connecting means restrains the positions of the cylindrical body movement holding means and the cylindrical body movement means in the axial direction of the cylindrical body using fluid pressure, and the cylindrical body movement holding means and the cylindrical body movement means An apparatus for processing a cylindrical body, characterized in that it is means for connecting the positions so that they can move freely on a cross section perpendicular to the axis of the cylindrical body.   The cylindrical body processing apparatus according to claim 1, wherein a gas is used as the fluid.   The connection means includes a fluid supply port through which fluid is injected and at least two static pressure pads provided with holes for allowing the injected fluid to pass through, the static pressure pad moving the cutting member The cylindrical body processing apparatus according to claim 1 or 3, wherein the cylindrical body processing apparatus is disposed so as to face at least a part of the holding means.   The connecting means includes a fluid supply port through which fluid is injected and at least two static pressure pads provided with holes for allowing the injected fluid to pass through, the static pressure pad moving the cylindrical body 4. The cylindrical body processing apparatus according to claim 2, wherein the cylindrical body processing apparatus is disposed so as to face at least a part of the arm fixed to the holding means.   The inner diameter cross-sectional area of the hole of the static pressure pad is 0.5% or more and 15% or less with respect to the area of the cross section orthogonal to the hole of the static pressure pad. Cylindrical body processing equipment.   7. The cylinder according to claim 4, wherein the inner diameter and the length of the hole of the static pressure pad are in a range of 1 to 50 times the length of the inner diameter. Body processing equipment.   6. The cylindrical body processing apparatus according to claim 4, wherein the static pressure pad is a porous member made of a porous mineral or a foamed resin. A cylindrical body processing method for performing processing by moving the cutting member in the axial direction of the cylindrical body while turning the cutting member around the axis of the cylindrical body,
A processing method for a cylindrical body, wherein the processing apparatus according to any one of claims 1, 3, 4, 6 to 8 is used for processing the cylindrical body. A cylindrical body processing method for performing processing by moving the cylindrical body in the axial direction of the cylindrical body while turning the cutting member around the axis of the cylindrical body,
A processing method for a cylindrical body, wherein the processing apparatus according to any one of claims 2, 3, 5 to 8 is used for processing the cylindrical body.   A cylindrical body processed by the processing method according to claim 9 or 10.   A photosensitive drum manufactured using the cylindrical body according to claim 11 as a substrate.