JP2004154852A - Multilayered cylinder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multilayered cylinder having little unevenness of diameter and large (L/D) ratio. <P>SOLUTION: A bottomed cup body is formed by performing drawing and redrawing working to a multilayered plate material, and the side wall thickness of the bottomed cup body is worked under reducing thickness with an ironing or the diameter and the side wall thickness of the bottomed cup body are worked under reduced thickness with the drawing or the ironing to form a thin bottomed cylinder. The above thin bottomed cylinder is drawn in order to form the drawn bottomed cylinder and the both ends of the drawn bottomed cylinder are trimmed in order to form the multilayered cylinder. This working under reduced thickness can be performed at one or more times with the ironings or the drawings. <P>COPYRIGHT: (C)2004,JPO

Description

【００２６】
【表２】
（多層円筒体各層の厚み）

【００２７】
【表３】

【００２８】
【発明の効果】
本発明は、上記のように構成されているので、形状及び寸法において高い精度を要求される多層円筒体とすることができる。
特に、高い真円度が要求されるプリンタやコピー機等の感光ドラム基体等に提供できる。
【図面の簡単な説明】
【図１】本発明の多層円筒体の製造方法を示す一実施形態にかかり、ブランク材を絞り再絞りする工程を示す説明図である。
【図２】有底カップ体の側壁を薄肉化するためのしごき加工（Ｉｒｏｎｉｎｇ）の説明図である。
【図３】しごき加工装置を示す概略説明図である。
【図４】１工程で３回のしごきを行なう場合のしごき加工装置を示す概略説明図である。
【図５】引抜きダイス及び引抜きプラグからなる引抜き装置により引抜き有底円筒体を成形する概略説明図である。
【図６】引抜き有底円筒体の両端部をトリミングする工程の説明図である。
【図７】両端部をトリミングした後の多層円筒体の縦断面を示す説明図である。
【符号の説明】
１１：円板（ブランク材）
１２：有底円筒状の有底カップ体
２１：多層有底円筒体
３１：パンチ
３２：貫通孔
３３，３３ａ，３３ｂ，３３ｃ：しごきダイス
４１：ストリッパ機構
５１：引抜きダイス
５２：引抜きプラグ
５３：引抜き有底円筒体
６１：チャック
６２：スピンドル
６３：外カッタ
６３ａ：内カッタ
７０：多層円筒体[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a thin-walled seamless tube having a large length with respect to a diameter. The present invention relates to a multilayer cylindrical body, such as various rolls such as rolls, a belt, a sleeve, and a pipe, which have a large length with respect to the diameter and which require high precision.
[0002]
[Prior art]
2. Description of the Related Art In recent years, cartridges of components have been developed in printers and copiers, and photosensitive drums and developing rolls have adopted a form in which the cartridges are replaced with new ones as consumables. Therefore, reduction and weight reduction are required in consideration of convenience at the time of disposal. On the other hand, from the viewpoint of energy saving, it is desirable to eliminate the preheating mode of the copying machine or the like and to heat the copier to a predetermined temperature at the time of use. Therefore, a method of reducing the heat capacity by reducing the thickness of the fixing roll and the like and increasing the temperature to a predetermined temperature in a short time has been studied.
In this way, various types of rolls such as photosensitive drum bases, developing rolls, fixing rolls, transfer rolls, paper feed rolls, and charging rolls for printers and copiers, belts, sleeves, pipes, etc. Are required to reduce weight and weight and to reduce heat capacity.
By the way, in order to improve the thermal efficiency, there has been proposed a fixing roller having a configuration in which a ferromagnetic layer serving as a heating unit and then a high heat conductive layer are provided on the side facing the magnetic flux generating unit (see Patent Document 1).
Examples of the roller having such a layer configuration include a single-layer cylinder formed by extrusion-drawing and forming a layer by surface treatment such as plating and thermal spraying, and a multilayer composite billet by extrusion-drawing. A multi-layer cylindrical body is known.
Further, a multilayer plate is known in which a multi-layer plate material is rounded and ends thereof are butt-welded to form a multilayer cylinder.
Further, when a thin-walled belt is used, it is known that a nickel electroformed tube is subjected to a surface treatment to form a multilayer belt.
[0003]
On the other hand, these cylinders are used so as to rotate around a central axis. For example, the photosensitive drum substrate and the developing roll should have as small an outer diameter "vibration" as possible, in order to ensure the transfer of toner particles. It is required that the circularity and cylindricity be made highly accurate. In addition, in the case of using a cylindrical body as a belt by inserting and driving two rotating shafts inside the cylindrical body, for example, in the case of a fixing belt, "uniformity in diameter" is required to prevent meandering.
In recent years, as the quality of images and the printing speed have been increased, the demands for higher accuracy of "runout" and "uniformity of diameter" have been increasing in order to accurately overlap colors. These requirements are exactly the same for multilayer cylinders.
[0004]
In the multilayer cylindrical body manufactured by the above-described method, for example, a photosensitive drum is coated with a photosensitive paint by a dipping method and dried to form a predetermined photosensitive layer (see Patent Document 2). An organic film is formed as a layer.
[Patent Document 1]
JP 2001-230064 A [Patent Document 2]
Japanese Patent Publication No. 2-501501
[Problems to be solved by the invention]
However, there has been a problem that the conventional multilayer cylindrical body cannot sufficiently meet the above-mentioned various requirements. That is, in the case of forming a multilayer by surface treatment, the method of Patent Document 1 employs a method of applying an electric nickel plating to an aluminum inner surface formed in a pipe shape in advance, but a nickel plating is applied to an inner surface of a pipe having a large L / D. However, there is a problem that it is considerably difficult to perform the process uniformly.
In addition, in a multilayer cylindrical body formed by extrusion-drawing a multilayer composite billet, the entire side wall cannot be reduced in thickness, and the uneven thickness is 10 μm or more. Nothing is uniform in the circumferential direction.
Furthermore, in the case of a multi-layer plate material, the thickness of each layer can be made uniform, but the multi-layer cylindrical body obtained by rounding the plate material and welding the end portion is liable to be a defect due to the presence of a butt weld.
Next, the electroformed tube is excellent in thinning and accuracy, but has a problem that the yield is low, the productivity is low because of low productivity, and defects such as nests are easily generated.
Furthermore, conventionally, when coating the surface of the cylindrical body with a paint or the like, unevenness of the coating film thickness due to dripping of the paint or uneven drying, orange peel, etc. are likely to occur, and the cylindrical body is pulled up after dipping. There is a problem that productivity is poor because a paint pool is formed at the lower end of the film, and is treated or chucked one by one and immersed at a low speed.
The present invention has been made in view of the above problems, and has as its object to provide a multilayer cylinder having a large L / D ratio, which satisfies high precision “roundness” and “uniformity of diameter”. .
[0006]
[Means for Solving the Problems]
After the multilayer cylindrical body of the present invention is formed into a bottomed cup body by molding a multilayer plate material,
The thickness of the side wall of the bottomed cup body is reduced so that the thickness of each layer of the side wall after the thickness reduction is reduced at substantially the same reduction rate as the thickness of each layer in the plate material,
Forming a bottomed cylindrical body with thinner side walls,
It is characterized in that both ends of the cylindrical body with a thinner side wall are trimmed.
In such a multilayer cylindrical body, it is preferable that the thickness reducing processing is one or more times of ironing, or one or more times of ironing and drawing.
In the case where the drawing process is performed, it is preferable to perform the drawing process at the end of the thickness reducing process.
Furthermore, in the multilayer cylindrical body of the present invention, the relationship between the outer diameter D and the length L of the multilayer cylindrical body is L / D> 5.
In the multilayer cylindrical body of the present invention, the multilayer plate material for forming the multilayer cylindrical body is a clad material, the hardness of the innermost layer of the clad material is higher than the hardness of the outermost layer, and the clad material is It is preferable to adopt three layers, and that the hardness of the intermediate layer is higher than the hardness of the innermost layer and the hardness of the outermost layer.
Further, in the multilayer cylindrical body of the present invention, it is also preferable that the multilayer plate is a resin-coated metal material.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the multilayer cylindrical body of the present invention will be described with reference to the drawings.
The multilayer cylindrical body of the present invention forms a bottomed cup body in the steps of multilayer plate material → blank material punching → drawing (including redrawing), and then performs the following ironing and / or drawing to form the bottomed cup. The side wall is reduced in thickness so that the thickness of each side wall layer is reduced at substantially the same reduction rate with respect to the thickness of each layer in the plate material, to form a side wall thinned bottomed cylinder.
Then, the upper and lower ends in the longitudinal direction of the cylindrical body with a thinner side wall are trimmed to finally obtain a multilayer cylinder without a bottom.
Therefore, if the thickness of each layer of the final multilayer cylindrical body after trimming is determined and the reduction rate in the thickness reduction processing is determined, the thickness of the multilayer plate material to be used is inevitably determined. Since the thickness of each layer constituting the multilayer board can be made with high precision, the thickness of each layer of the multilayer cylindrical body can be made with high precision as a result.
The thickness reducing process may be performed once or twice or more, or may be performed by combining one or more times of ironing and drawing. Which of these processing methods is used at which stage is appropriately determined depending on the type of a multilayer plate material to be described later and how much the side wall of the bottomed cup body is thinned.
[0008]
FIG. 1 is an explanatory view showing a step of drawing and redrawing a blank material punched out of a two-layered multilayer plate material according to an embodiment showing an example of a method for manufacturing a multilayer cylindrical body of the present invention.
In FIG. 1, a bottomed cylindrical cup body 12 is formed by drawing a circular plate (blank material 11) (FIG. 1A) obtained by press punching from a multilayer plate material through a punch with a drawing die (FIG. 1A). 1 (b)) and formed by redrawing (FIG. 1 (c)).
Here, the outer diameter D ₀ and the height H of the final bottomed cup body 12 after the drawing and re-drawing step in the present invention are described. If the redrawing shown in FIG. 1 (c) is repeated, the height can be increased as the diameter decreases, and there is an advantage that the thickness reduction for obtaining a predetermined length of the cylindrical body can be reduced. The height of the bottomed cup body in the circumferential direction becomes uneven due to the effect of anisotropy, so-called “ears” become noticeable, and wrinkles easily occur on the side walls. Ears become an obstacle in performing stable thickness reduction processing such as causing stripping defects after ironing, and wrinkles must be avoided as much as possible in order to obtain a side wall having a uniform layer structure which is the object of the present invention. It is better not to increase the H / D ₀ of the bottom cup body indefinitely, and it is desirable that the H / D ₀ is 6 or less depending on the material. On the other hand, if H / D ₀ is too small, it is necessary to increase the side wall thickness reduction rate to obtain a predetermined side wall height. However, if the thickness reduction processing is repeated, the surface layer is easily damaged or peeled, A good cylindrical body cannot be obtained because the cylindrical body becomes brittle due to work hardening. Although the limit value of the side wall reduction rate depends on the material used, it is usually desirable that H / D ₀ is 1 or more. In FIG. 1, the number of times of re-drawing is one, but the number of times of re-drawing can be increased by selecting H / D ₀ .
[0009]
(Multilayer board material)
As a multilayer board,
Examples include those obtained by laminating two or more kinds of metals, and those formed by laminating metals and plastics or ceramics.
Aluminum (including aluminum alloy; the same applies hereinafter) -iron (including steel and stainless steel; the same applies hereinafter), aluminum-iron-aluminum,
Aluminum-nickel, aluminum-nickel-aluminum,
Nickel-iron, nickel-iron-nickel,
Titanium (including titanium alloy; the same applies hereinafter) -aluminum, aluminum-titanium-aluminum,
Copper (including a copper alloy; the same applies hereinafter) -nickel (including a nickel alloy; the same applies hereinafter),
Copper-iron, copper-iron-nickel,
And the like, and a clad plate in which two or three metal plates are laminated, but a metal plate with four or more layers may be used.
Moreover, the same type of metal having a different alloy composition such as aluminum and aluminum may be clad.
Further, the clad plate may be formed by plating a metal plate serving as a substrate. For example, a steel plate whose surface is nickel-plated can be used.
By using the clad material, it is possible to obtain a material having the characteristics of each material. For example, a combination of materials can be selected depending on the purpose, such as thermal conductivity, corrosion resistance, elasticity, and conductivity.
As a method for producing the clad material, a hot rolling method, an explosion bonding method, a cladding method, a casting method, a diffusion bonding method, a cold rolling method in a vacuum atmosphere, and the like are appropriately adopted.
[0010]
(Resin coating material)
Further, as the multilayer plate material, a resin-coated metal material having a resin film on a single-layer or multilayer metal material is also preferably used. When the multilayer cylindrical body of the present invention is used as a substrate such as a photosensitive drum or a fixing belt, a photosensitive paint and a release layer are applied to the surface of the substrate, respectively, so that a final product is obtained. Is used in advance as a resin film, and a material coated on a metal material is used as a blank material, whereby a resin-coated cylindrical body free from unevenness in film thickness and surface defects can be obtained.
Further, since the coating resin functions as a solid lubricating film, it also prevents surface flaws during processing of the multilayer cylindrical body.
Furthermore, the resin film also has a role as a photosensitive layer in the case of a photosensitive drum, and as a release layer in the case of a fixing belt.
As the resin film, a thermoplastic resin film such as a thermoplastic polyester or polyolefin, or an epoxy-based or vinyl-based coating film is preferably used. When coating the resin film, an adhesive may or may not be used depending on the type of the resin film. In order to obtain the function of each layer, pigments, powders, compounds, and the like can be dispersed and compatible in the resin film.
[0011]
The resin film is coated at least on the surface of the metal material, but may be one or more layers, or may be a multilayer according to the layer configuration. Since the resin-coated metal plate covers the resin film in a state where the metal plate is cut or unwound from a coiled state, the thickness of the film can be relatively easily made uniform. . Therefore, in the resin-coated metal plate, the thickness of each of the metal plate and the resin film is uniform, and the thickness of the resin-coated metal plate itself is also uniform.
[0012]
When the resin film is based on a thermoplastic resin, it is coated by any method such as an extrusion laminating method, a non-stretched cast film laminating method, or a method of laminating a biaxially stretched film. . In particular, non-stretched and amorphous thermoplastic resin films should be able to follow the elongation and shrinkage deformation associated with thinning of metal plates without causing damage such as peeling or cracking even during severe ironing. It is preferable to use it for a resin-coated metal plate because it functions as a lubricant.
[0013]
Next, as shown in FIGS. 2A, 2B and 2C, ironing is performed to reduce the thickness of the side wall of the bottomed cup body. The ironing can be performed, for example, by a processing device shown in FIG.
In FIG. 3, a through hole 32 is provided in an ironing die 33, a cooling lubricating liquid is applied to the surface of the bottomed cup body 12, and pressing is performed by a punch 31 in the arrow direction shown in FIG. Done.
After being drawn, the bottomed cup body 12 is formed into a bottomed cylindrical shape (see FIG. 1) whose bottom thickness and side thickness are both equal at t0, and when the bottomed cup body 12 passes through the ironing die 33. Then, the side wall is thinned and the entire length is extended to form a thinned bottomed cylindrical body 21 as shown in FIG.
By limiting the ironing rate at this time to the range of 5% to 50%, preferably 10% to 40%, the thickness of each layer on the side wall after thickness reduction is almost the same as the thickness of each layer in the plate material. And thinned.
By performing such ironing in several steps, the side wall thicknesses t1a and t1b (FIG. 2A) of each layer of the side wall formed by the first ironing as shown in the example of the two layers in FIG. The thickness is reduced to t2a and t2b by the second ironing process, and further reduced to t3a and t3b by the third ironing process, and the thickness of each side wall layer is reduced at a substantially equal ratio. A bottomed cylinder is formed.
In this case, it is important to limit the ironing rate at each stage to a range of 5 to 50%.
When the ironing rate exceeds 50%, the thickness of each layer is not equally reduced due to the breakage of the side wall or the local peeling of the surface layer, and the ironing rate of less than 5% results in low thickness reduction efficiency and workability. bad.
Also, in order to smoothly reduce the thickness, it is important to pay attention to the shape and surface roughness of the through hole 32 of the ironing die 33. The surface roughness is desirably a mirror surface. Further, the surface roughness of the punch 31 is preferably a mirror surface.
Since the resin tends to soften at a high temperature, when the surface is coated with the resin, it is necessary to control the temperature of the cooling lubricating liquid (coolant) to stabilize the molding behavior of the resin layer. desirable. When the inner and outer surfaces are coated with resin, the lubrication of the resin does not necessarily require the use of a cooling lubricant, but stabilizes the molding behavior of the resin layer by adjusting the temperature of the punch and ironing die. It is desirable to do.
In addition, in order to increase the efficiency of the ironing, for example, as shown in FIG. 4, three ironing dies 33a, 33b, and 33c can be arranged in tandem and three-step ironing can be performed in one process.
Ironing is a simple method of forming a thinned bottomed cylinder, and by employing continuous ironing as shown in FIG. 4, productivity can be further increased.
Then, the thinned bottomed cylindrical body 21 formed as described above is detached from the punch 31 via the stripper mechanism 41.
[0014]
(Drawing process)
Next, as shown in FIG. 5A, FIG. 5B, and FIG. 5C as time elapses, the detached thinned bottomed cylindrical body 21 is removed by a drawing device including a drawing die 51 and a drawing plug 52. A drawn bottomed cylindrical body 53 is formed. The number of drawing passes is preferably one for simplification of the process, and the radial reduction (outer diameter shrinkage ratio) at the time of drawing is preferably 0.5 to 10%.
The reason is that if it is less than 0.5% or more than 10%, the roundness in the longitudinal direction of the drawn bottomed cylindrical body 53 cannot be improved and the diameter thereof cannot be made uniform. A particularly preferred radial reduction is 1 to 7%.
Further, it is preferable that the thickness reduction rate (thickness reduction rate) in the thickness direction during the drawing process is 1 to 40%.
The reason is that if it is less than 1%, the roundness in the longitudinal direction of the drawn bottomed cylindrical body 53 cannot be improved and the diameter cannot be made uniform, and if the wall thickness reduction rate exceeds 40%, the soft surface layer is locally formed. This is because a difference in the thickness reduction rate of each layer tends to occur due to a reduction in the thickness, and the likelihood of breakage is increased, resulting in reduced productivity. A particularly preferred rolling reduction in the thickness direction is 5 to 30%.
The drawing process in the present invention is preferably provided at least in the final process of the thickness reducing process as a finishing process for making the diameter of the cylindrical body uniform, but may be performed in the middle of the drawing process and the ironing process. .
Further, as described above, the plate material is drawn or drawn and redrawn to form the bottomed cup body, and the diameter and / or thickness of the bottomed cup body is reduced by ironing or drawing / ironing. Although the description has been given of the case where the thinned bottomed cylindrical body is formed, the thinned bottomed cylindrical body may be formed only by the drawing process without using the drawing or the ironing process.
[0015]
(Trimming at both ends)
Next, as shown in FIG. 6, it is inserted and fixed to a spindle 62 via a chuck 61 which expands outward by hydraulic pressure or the like, and the rotation of the spindle 62 causes the outer cutters 63, 63 and the inner cutters 63a, 63a to rotate. At the position indicated by the one-dot chain line in FIG. 6, both ends of the drawn bottomed cylindrical body 53 are trimmed (cut). The multilayer cylindrical body 70 having both ends trimmed (see the example of two layers in FIG. 7) is used as, for example, a photosensitive drum base for electrophotography.
As described above, the multilayered cylindrical body 70 obtained by the drawing process has a high cylindrical accuracy and a high surface accuracy regarding the uniformity of the thickness, roundness, and diameter.
In addition, by performing ironing in a process prior to the drawing process, the thickness of the cylindrical body can be reduced with extremely high productivity, so that the weight of the multilayer cylindrical body 70 can be reduced.
[0016]
(L / D> 5)
As described above, the heat capacity of the photosensitive drum substrate, developing roll, fixing roll, transfer roll, paper feed roll, charging roll, and other various rolls, belts, sleeves, and pipes of printers and copiers is reduced by making them thinner and smaller in diameter. In order to reduce the temperature and raise the temperature to a predetermined temperature in a short time, the L / D of the cylindrical body is preferably large.
On the other hand, the length (L) is determined in consideration of the device in which the cylinder is incorporated, and the thickness and outer diameter of the cylinder are determined in consideration of the strength, heat conduction, and the like of the cylinder.
When the L / D ratio is 5 or less, the heat capacity increases due to an increase in the outer diameter of the cylindrical body with respect to the photosensitive drum base or the like that requires a length of 260 mm or more, and the temperature rises to a predetermined temperature. It is not preferable because it takes time.
Therefore, in the present invention, (length L of multilayer cylindrical body) / (outer diameter D of cylindrical body)> 5 excluding trimming allowance.
[0017]
When a multilayer cylindrical body is to be formed using a hard material that is difficult to process, it is preferable to use a multilayer plate material such that a hard material is disposed inside the multilayer cylindrical body and a soft material is disposed outside the multilayer cylindrical body. For example, a clad material having a combination of aluminum (soft) -titanium (hard) is used.
In this case, the soft material disposed outside the multilayer cylinder plays a role as a lubricant during processing, and it can prevent drawing, ironing, cracking of the material during drawing, etc. of a hard material. A long multilayer cylinder can be formed.
Also, a hard material can be made into a sandwich with a soft material.
For example, the clad material is a combination of aluminum (soft) -titanium (hard) -aluminum (soft).
Further, a material having excellent thermal conductivity (for example, copper) is clad on both sides with a material having excellent corrosion resistance (for example, titanium) and a soft material (for example, aluminum) which is easy to form. A cylindrical body can be formed.
[0018]
When using a resin film material, when drawing, ironing, or drawing, the cylindrical body being processed does not directly contact a processing jig such as an ironing die, and the resin film intervenes between the two. There is no risk of surface defects due to wear of the jig. Further, when the inner and outer surfaces are coated with a resin, there is no need to use a cooling lubricating liquid (coolant), so that there is no possibility that a surface defect due to running out of oil, entrapment of foreign matter, or the like will occur.
[0019]
【Example】
(Example 1)
As a multilayer plate material, a 0.525 mm thick aluminum alloy plate (JIS H4000 alloy number 3004H12) (first layer) coated with a 0.025 mm thick resin film (unstretched PET film) (second layer), diameter Using a blank material having a thickness of 152 mm and a thickness of 0.55 mm, a cup with a bottom having an inner diameter of 31.1 mm was manufactured by drawing and redrawing so that the resin film was on the outer surface. The redrawing was performed in six steps, and the H / D ₀ of the bottomed cup body was 5.5. The bottomed cup body was ironed to a thickness of 0.38 mm using an ironing punch having an outer diameter of 31.05 to form a thinned bottomed cylindrical body. The outer diameter of the thinned bottomed cylinder after ironing was 31.8 mm.
The ironing speed was 0.5 m / sec, and J602A manufactured by Nippon Quaker Chemical Co., Ltd. diluted to 3% with water was used as a cooling lubricant.
Next, the thinned bottomed cylindrical body was subjected to a drawing process.
The drawing process was performed such that the drawing speed was set to 0.2 m / sec, the outer diameter after drawing was 30.0 mm, the thickness was 0.30 mm, and the height was 350 mm. The same cooling lubrication liquid as used in the ironing was used.
Both ends of the drawn bottomed cylinder obtained by the above-mentioned drawing were trimmed and cut off to obtain a multilayer cylinder having a length of 300 mm, an outer diameter of 30.0 mm and a thickness of 0.30 mm, respectively.
Table 1 shows the manufacturing conditions for the thin-walled bottomed cylinder at this time, and Table 2 shows the thickness of each layer when the multilayer cylinder was completed.
Table 3 shows the roundness and the uniformity of the diameter of the multilayer cylindrical body. The value of the roundness in the table is the largest (bad) value of the roundness at each position of every 20 mm from the end of the multilayer cylindrical body. The uniformity of the diameter is the difference between the maximum value and the minimum value of the outer diameter at each position every 20 mm.
[0020]
(Example 2)
As a multilayer plate material, a 0.05 mm-thick aluminum plate (second layer) and a 0.25 mm-thick steel plate (JIS G3303) (first method) were formed by a surface activated bonding method (cold rolling method in a vacuum atmosphere). A blank material obtained by punching out a 0.30 mm thick clad material having a thickness of .phi. The micro Vickers hardness of the clad material was Hv26 for the aluminum plate and Hv178 for the steel plate. This blank material was drawn and redrawn so that the steel plate was on the inner surface side of the bottomed cup to produce a bottomed cup body having an inner diameter of 31.1 mm. Redrawing was performed in 5 steps, and the H / D ₀ of the bottomed body was 3.1. The bottomed cup body was sequentially thinned by ironing three times, and was ironed to a thickness of 0.12 mm to form a thin bottomed cylindrical body. The outer diameter of the thin-walled cylindrical body after ironing was 31.14 mm. The ironing speed and the cooling lubricant used are the same as in Example 1.
The drawing process was performed such that the drawing speed was set to 0.2 m / sec, the outer diameter after drawing was 30.0 mm, the thickness was 0.10 mm, and the height was 310 mm. The same cooling lubricant as that used for ironing was used.
Both ends of the drawn bottomed cylinder obtained after the above-mentioned drawing were trimmed to obtain a multilayer cylinder having a length of 260 mm, an outer diameter of 30.0 mm and a thickness of 0.10 mm, respectively. Table 1 shows the manufacturing conditions for the thin-walled bottomed cylinder at this time.
Table 2 shows the thickness of each layer when the multilayer cylindrical body was completed.
Table 3 shows the roundness and the uniformity of the diameter of the multilayer cylindrical body.
[0021]
(Example 3)
Oxygen-free copper (third layer) having a thickness of 0.03 mm and nickel having a thickness of 0.02 mm (first layer) were provided on both sides of a steel plate (JIS G3303) (second layer) having a thickness of 0.25 mm as a multilayer plate material. The joined clad material having a thickness of 0.30 mm was used. The micro Vickers hardness of the clad material was Hv50 for the copper plate, Hv178 for the steel plate, and Hv149 for the nickel plate. Nickel was provided on the inner surface side. Except for this, the same procedure as in Example 2 was performed to obtain a multilayer cylindrical body having a length of 260 mm, an outer diameter of 30 mm, and a thickness of 0.10 mm.
Table 1 shows the manufacturing conditions for the thin-walled bottomed cylinder at this time, and Table 2 shows the thickness of each layer when the multilayer cylinder was completed.
Table 3 shows the roundness and the uniformity of the diameter of the multilayer cylindrical body.
[0022]
(Example 4)
0.27 mm thick stainless steel (second layer) with both sides joined to 0.03 mm oxygen-free copper (third layer) and 0.02 mm (first layer) nickel as a multilayer board A blank material obtained by punching a 0.32 mm clad material to a diameter of 109 mm was used. The micro Vickers hardness of the clad material was Hv50 for the copper plate, Hv175 for the stainless steel, and Hv149 for the nickel plate. A bottomed cup body having an inner diameter of 31.1 mm was manufactured by drawing and redrawing so that the nickel side was on the inner surface side of the bottomed cup. Redrawing the H / _{D 0} of 5 steps, bottom cup body was 2.7. Thinning was performed sequentially by ironing five times, and ironing was performed to a thickness of 0.08 mm to form a thin-walled bottomed cylinder. The outer diameter of the thin-walled bottomed cylinder after ironing was 30.96 mm. The ironing speed and the cooling lubricant used are the same as in Example 1.
The drawing process was performed such that the drawing speed was set to 0.2 m / sec, the outer diameter after drawing was 30.0 mm, the thickness was 0.07 mm, and the height was 420 mm. The same cooling lubricant as that used for ironing was used.
Both end surfaces of the drawn bottomed cylindrical body obtained after the above drawing were trimmed to obtain a multilayer cylindrical body having a length of 370 mm, an outer diameter of 30.0 mm and a thickness of 0.07 mm, respectively.
Table 1 shows the manufacturing conditions for the thin-walled bottomed cylinder at this time, and Table 2 shows the thickness of each layer when the multilayer cylinder was completed. Table 3 shows the roundness and the uniformity of the diameter of the multilayer cylindrical body.
[0023]
(Comparative Example 1)
As a multilayer plate material, a 0.45 mm thick aluminum alloy plate (JIS H4000 alloy number 3004H12) (first layer) is coated with a 0.025 mm thick resin film (if it is better to specify the type, "unstretched PET film" Use a blank material with a thickness of 0.455 mm and a diameter of 167 mm coated with the (second layer). A bottom cup body was manufactured. Redrawing 7 steps, H / _{D 0} of the bottom cup body was 6.8. Although vertical drawing wrinkles occurred in the opening of the bottomed cup body, ironing and drawing were performed under the same conditions as in Comparative Example 1. In the cylindrical body after the drawing, it was observed that the resin film of the wrinkled portion was partially thinned and the metal surface was exposed.
Table 1 shows the manufacturing conditions for the thin-walled bottomed cylinder at this time, and Table 2 shows the thickness of each layer when the multilayer cylinder was completed. Table 3 shows the roundness and the uniformity of the diameter of the multilayer cylindrical body.
[0024]
(Comparative Example 2)
As a multilayer board material, 0.08 mm thick oxygen-free copper (third layer) and 0.07 mm thick (first layer) nickel were placed on both sides of a 0.85 mm thick steel sheet (JIS G3303) (second layer). A blank material obtained by punching a joined clad material having a thickness of 1.0 mm into a diameter of 67.5 mm was used. The micro Vickers hardness of the clad material was Hv50 for the copper plate, Hv165 for the steel plate, and Hv149 for the nickel plate.
A bottomed cup body having an inner diameter of 31.1 mm was manufactured by drawing and redrawing so that the nickel side was on the inner surface side of the bottomed cup. The redrawing was performed in two steps, and the H / D ₀ of the bottomed cup body was 0.9. Thinning was performed sequentially by ironing five times, and ironing was performed to a thickness of 0.12 mm to form a thin bottomed cylindrical body. The outer diameter of the thin-walled cylindrical body after ironing was 31.04 mm. The ironing speed and the cooling lubricant used were the same as in Example 1.
The inner and outer surfaces after ironing had a partial slight peeling, but were subjected to a drawing process under the same conditions as in Example 2 and trimmed on both end surfaces of the obtained drawn bottomed cylindrical body to have a length of 260 mm. A multilayer cylindrical body having an outer diameter and a thickness of 30.0 mm and 0.10 mm, respectively, was obtained.
Table 1 shows the manufacturing conditions for the thin-walled bottomed cylinder at this time, and Table 2 shows the thickness of each layer when the multilayer cylinder was completed. Table 3 shows the roundness and the uniformity of the diameter of the multilayer cylindrical body.
As shown in Tables 2 and 3, in the multilayer cylindrical body of the example of the present invention, the thickness of each layer was reduced at a uniform ratio, and the roundness and the uniformity of the diameter were also excellent. . On the other hand, the multilayer cylindrical body of the comparative example was wrinkled and delaminated during the processing, and was not practical.
[0025]
[Table 1]
(Manufacturing conditions for thin-walled bottomed cylinder)

[0026]
[Table 2]
(Thickness of each layer of multilayer cylinder)

[0027]
[Table 3]

[0028]
【The invention's effect】
Since the present invention is configured as described above, it is possible to provide a multilayer cylindrical body that requires high precision in shape and dimensions.
In particular, the present invention can be applied to a photosensitive drum substrate of a printer, a copying machine, or the like that requires a high roundness.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing a step of drawing and redrawing a blank material according to an embodiment showing a method of manufacturing a multilayer cylindrical body of the present invention.
FIG. 2 is an explanatory view of an ironing process (Ironing) for thinning a side wall of a cup body with a bottom;
FIG. 3 is a schematic explanatory view showing an ironing device.
FIG. 4 is a schematic explanatory view showing an ironing apparatus when ironing is performed three times in one step.
FIG. 5 is a schematic explanatory view of forming a drawn bottomed cylindrical body by a drawing device including a drawing die and a drawing plug.
FIG. 6 is an explanatory diagram of a step of trimming both ends of a drawn bottomed cylindrical body.
FIG. 7 is an explanatory view showing a vertical cross section of the multilayer cylindrical body after trimming both ends.
[Explanation of symbols]
11: disk (blank material)
12: bottomed cylindrical cup body 21: multilayer bottomed cylindrical body 31: punch 32: through holes 33, 33a, 33b, 33c: ironing die 41: stripper mechanism 51: drawing die 52: drawing plug 53: drawing. Bottomed cylinder 61: chuck 62: spindle 63: outer cutter 63a: inner cutter 70: multilayer cylinder

Claims (9)

After forming the multi-layer plate material into a bottomed cup body by molding processing,
The thickness of the side wall of the bottomed cup body is reduced so that the thickness of each layer of the side wall after the thickness reduction is reduced at substantially the same reduction rate as the thickness of each layer in the plate material,
Forming a bottomed cylindrical body with thinner side walls,
A multilayer cylindrical body characterized by trimming both ends of the side wall thinned bottomed cylindrical body. The multilayer cylindrical body according to claim 1, wherein the thickness reduction is performed once or twice. 2. The multilayer cylindrical body according to claim 1, wherein the reduction processing is one or more times of ironing and drawing. 3. The multilayer cylindrical body according to claim 3, wherein a drawing process is performed at the end of the thickness reducing process. The multilayer cylinder according to any one of claims 1 to 4, wherein the relationship between the outer diameter D and the length L of the multilayer cylinder is L / D> 5. The multilayer cylindrical body according to any one of claims 1 to 5, wherein the multilayer board is a clad material. The multilayer cylindrical body according to claim 6, wherein the hardness of the innermost layer of the clad material is higher than the hardness of the outermost layer. The multilayer cylindrical body according to claim 6, wherein the clad material is composed of three layers, and the hardness of the intermediate layer is higher than the hardness of the innermost layer and the hardness of the outermost layer. The multilayer cylindrical body according to any one of claims 1 to 8, wherein the multilayer board is a resin-coated metal material.

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