JPH031805B2 - - Google Patents
Info
- Publication number
- JPH031805B2 JPH031805B2 JP25129183A JP25129183A JPH031805B2 JP H031805 B2 JPH031805 B2 JP H031805B2 JP 25129183 A JP25129183 A JP 25129183A JP 25129183 A JP25129183 A JP 25129183A JP H031805 B2 JPH031805 B2 JP H031805B2
- Authority
- JP
- Japan
- Prior art keywords
- sleeve
- stainless steel
- magnetic
- magnet
- hardness
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 14
- 238000010622 cold drawing Methods 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 9
- 229910000859 α-Fe Inorganic materials 0.000 claims description 8
- 229910052759 nickel Inorganic materials 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 229910000963 austenitic stainless steel Inorganic materials 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 15
- 239000010935 stainless steel Substances 0.000 description 15
- 230000005389 magnetism Effects 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 108091008695 photoreceptors Proteins 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000005482 strain hardening Methods 0.000 description 2
- 230000002542 deteriorative effect Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/02—Permanent magnets [PM]
- H01F7/0231—Magnetic circuits with PM for power or force generation
- H01F7/0252—PM holding devices
- H01F7/0268—Magnetic cylinders
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、電子写真複写機やフアクシミリ受信
機に利用される磁気ブラシ現像用磁石ロールに関
するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a magnet roll for magnetic brush development used in electrophotographic copying machines and facsimile receivers.
従来例の構成とその問題点
一般に磁気ブラシ現像用磁石ロールは第１図に
示すように、シヤフト１の回りにロール状に加工
した磁石２を配置し、非磁性の円筒形スリーブ３
内に回転可能な状態に組込んで構成されており、
この磁石ロールのスリーブ３とロール状磁石２を
相対的に回転させることにより、スリーブ３の表
面に吸着したトナー４を搬送し、感光体ドラムの
表面に形成した静電潜像にこのトナー４を移行さ
せ顕像化するという磁気ブラシ現像法に利用され
ている。Conventional Structure and Problems Generally, as shown in FIG. 1, a magnet roll for magnetic brush development has a magnet 2 processed into a roll shape arranged around a shaft 1, and a non-magnetic cylindrical sleeve 3.
It is configured so that it can be rotated inside the
By relatively rotating the sleeve 3 of the magnet roll and the rolled magnet 2, the toner 4 adsorbed on the surface of the sleeve 3 is conveyed, and the toner 4 is transferred to the electrostatic latent image formed on the surface of the photoreceptor drum. It is used in the magnetic brush development method, which involves transferring and visualizing the image.
この時の円筒形スリーブ３はロール状磁石２の
磁力を有効にトナー４に伝えるため、0.5〜0.2mm
の薄肉材料が使用されており、材質としては、ロ
ール状磁石２の磁気特性に影響を及ぼさないよう
に、非磁性のアルミニウムと、ステンレス鋼が一
般に使用されている。但し、アルミニウムスリー
ブは、加工性は良いが、機械的強度が低く、かつ
スリーブ３とロール状磁石２の相対的回転数が
200rpm以上になると、ロール状磁石２からの磁
束がスリーブ３内を交差することにより発熱し、
トナー４を熱劣化させるという欠点があるため小
型・高速回転の磁石ロールには、アルミニウムス
リーブの上記欠点を除去したステンレススリーブ
が採用されている。またスリーブ３の表面加工と
して、トナー４の搬送力を増すためにスリーブ３
の表面に種々の処理を施してトナー４との摩擦を
増すことはよく知られているところであり、最近
トナー４が数μ〜数10μと微細化されるに伴いよ
り緻密な凹凸を形成したものが使用されている。
この時従来のステンレススリーブをもつてして
も、なおかつ耐摩耗性が不足し長期使用途上にお
いて緻密な凹凸が、トナー４の搬送に伴なう摩擦
によつて削られてなくなつてしまい、複写機とし
ての保証コピー枚数の現像を維持することができ
ないという欠点があつた。この従来のステンレス
スリーブに使用するステンレス鋼管の製造方法の
概要は、製鋼→圧延→製管→熱処理→
冷間引抜→熱処理→曲り直しとなつており、
その鋼管の仕上寸法精度を向上させるために、
冷間引抜、熱処理、曲り直し、を繰り返して
製造する場合もあるが、この最後の熱処理を実施
することにより、冷間引抜による組成の変化を
矯正してオーステナイト系ステンレス鋼の非磁性
を確保している。以上の製造方法にて生産した汎
用のステンレス鋼の特性は、SUS304で、ビツカ
ース硬度180〜190、フエライト含有率0.5％以下、
SUS316で、ビツカース硬度150〜160、フエライ
ト含有率0.3％以下となつていた。 At this time, the cylindrical sleeve 3 is 0.5 to 0.2 mm in order to effectively transmit the magnetic force of the rolled magnet 2 to the toner 4.
A thin material is used, and non-magnetic aluminum and stainless steel are generally used so as not to affect the magnetic properties of the rolled magnet 2. However, although the aluminum sleeve has good workability, its mechanical strength is low, and the relative rotation speed between the sleeve 3 and the rolled magnet 2 is low.
When the speed exceeds 200 rpm, the magnetic flux from the rolled magnet 2 crosses inside the sleeve 3, generating heat.
Since it has the disadvantage of thermally deteriorating the toner 4, a stainless steel sleeve that eliminates the above-mentioned disadvantage of the aluminum sleeve is used for small-sized, high-speed rotating magnet rolls. In addition, as a surface treatment of the sleeve 3, the sleeve 3 is
It is well known that various treatments are applied to the surface of toner 4 to increase the friction with toner 4, and recently as toner 4 has been miniaturized from several micrometers to several tens of micrometers, more dense irregularities have been formed. is used.
At this time, even if a conventional stainless steel sleeve is used, it still lacks wear resistance, and during long-term use, the fine unevenness will be removed by the friction caused by the conveyance of the toner 4, resulting in copying problems. The machine had the disadvantage of not being able to maintain the guaranteed number of copies. The outline of the manufacturing method of stainless steel pipe used for this conventional stainless steel sleeve is as follows: Steel manufacturing → Rolling → Pipe manufacturing → Heat treatment →
The process is cold drawing → heat treatment → bending.
In order to improve the finished dimensional accuracy of the steel pipe,
In some cases, manufacturing involves repeating cold drawing, heat treatment, and bending, but this final heat treatment corrects the compositional changes caused by cold drawing and ensures the nonmagnetic properties of austenitic stainless steel. ing. The general-purpose stainless steel produced using the above manufacturing method has the following characteristics: SUS304, Bitkers hardness of 180 to 190, ferrite content of 0.5% or less,
It was made of SUS316, with a Bitkers hardness of 150-160 and a ferrite content of 0.3% or less.
発明の目的
本発明は、上記欠点に鑑み、非磁性でありなが
ら、より硬度を高くして耐摩耗性を向上させたス
テンレススリーブを使用した磁気ブラシ現像用磁
石ロールを提供することを目的とするものであ
る。Purpose of the Invention In view of the above drawbacks, an object of the present invention is to provide a magnet roll for magnetic brush development using a stainless steel sleeve that is non-magnetic but has higher hardness and improved wear resistance. It is something.
発明の構成
本発明の磁気ブラシ現像用磁石ロールは、円筒
形のスリーブに、最終冷間引抜における加工硬化
を利用し、表面のビツカース硬度を220以上に向
上させ、その引抜絞り率を５〜25％の範囲内に規
制することにより、冷間引抜後の熱処理を廃止し
ても、フエライト含有率0.5％以上の非磁性を確
保したオーステナイト系ステンレス鋼鋼管を使用
したものであり、このステンレススリーブのニツ
ケル成分率を10〜15％に規制することにより、よ
り確実な非磁性を確保することができるようにし
たものである。Structure of the Invention The magnetic brush developing magnet roll of the present invention utilizes work hardening in the final cold drawing of the cylindrical sleeve to improve the Vickers hardness of the surface to 220 or more, and has a drawing reduction rate of 5 to 25. %, even if heat treatment after cold drawing is abolished, this stainless steel pipe uses austenitic stainless steel pipe with a ferrite content of 0.5% or more, ensuring non-magnetic properties. By regulating the nickel content to 10-15%, more reliable non-magnetism can be ensured.
実施例の説明
以下本発明の一実施例について、図面を参照し
ながら説明する。DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.
本発明は、ステンレス鋼鋼管の最終の熱処理を
廃止しても磁気ブラシ現像用磁石ロールのスリー
ブとして最低必要な非磁性を確保するためのもの
で、非磁性を確保するためのニツケル成分率と、
最終冷間引抜の加工応力の作用する絞り率が相対
的に関係してくる。この関係を第２図により説明
すると、例えばニツケル成分率８％のSUS304を
採用した場合は、絞り率を10％以下に規制しても
非磁性の目安となるフエライト含有率は0.5％以
上になり、磁石ロールとしては使用できない。ま
たニツケル成分率12％SUS316を採用した場合
は、絞り率を25％まで増加しても、フエライト含
有率は0.3％になり十分非磁性の範中に収めるこ
とができる。但し、磁性をおさえるために、絞り
率を５％以下にした場合は、冷間引抜としての加
工応力が足りなくなり、鋼管として必要な寸法精
度を得ることができなくなるため実用上採用でき
ない。次に磁石ロールとして、フエライト含有率
0.5％以上の磁性を持つたスリーブを使用した現
像状態を黒ベタ画像の第３図により説明すると、
特に溶接ステンレス鋼管の溶接部に特に磁性がお
きやすく、スリーブ表面のトナーがスリーブの磁
性により、より強くスリーブに吸着し、感光体ド
ラムの静電力と、磁石の磁力により保たれていた
現像バランスがくずれて、スリーブから移行しな
いために、磁性部分の現像が不可能になり、白ム
ラ６のある画像となる。 The present invention is intended to ensure the minimum required non-magnetism as a sleeve of a magnet roll for magnetic brush development even if the final heat treatment of the stainless steel pipe is abolished.
The drawing ratio on which the processing stress of final cold drawing acts is relatively related. To explain this relationship using Figure 2, for example, if SUS304 with a nickel content of 8% is used, even if the drawing ratio is regulated to 10% or less, the ferrite content, which is a guideline for non-magnetism, will be 0.5% or more. , cannot be used as a magnetic roll. Furthermore, when SUS316 with a nickel content of 12% is used, even if the drawing ratio is increased to 25%, the ferrite content remains at 0.3%, which is well within the non-magnetic range. However, if the reduction ratio is set to 5% or less in order to suppress magnetism, the processing stress for cold drawing will not be sufficient and the dimensional accuracy required for the steel pipe will not be obtained, so it cannot be used in practice. Next, as a magnet roll, the ferrite content
The development state using a sleeve with magnetic properties of 0.5% or more is explained using Figure 3, which is a solid black image.
In particular, magnetism tends to occur in the welded parts of welded stainless steel pipes, and the toner on the sleeve surface is more strongly attracted to the sleeve due to the sleeve's magnetism, causing the development balance that was maintained by the electrostatic force of the photoreceptor drum and the magnetic force of the magnet to deteriorate. Since it collapses and does not transfer from the sleeve, it becomes impossible to develop the magnetic portion, resulting in an image with white unevenness 6.
また上記構成のものを採用して得るスリーブの
硬度は、最終冷間引抜による加工硬化によつて向
上し、その絞り率と硬度の関係は第４図に示すよ
うに、絞り率が大きくなる程硬度は向上し最終熱
処理した場合の硬度の約２倍まで可能となる。そ
のため、スリーブの硬度が向上するトナーとの摩
擦による耐摩耗性が向上し、表面粗度を１〜2μ
に荒したスリーブの場合の耐久コピー枚数も第５
図に示すように、ビツカース硬度220で熱処理品
の1.5倍、ビツカース硬度300で２倍となつてい
る。但し、ニツケル成分率を15％以上にして、上
記製造方法を導入しても、ニツケル成分が多くな
る程、硬度が低くなることと、ステンレス鋼とし
ての材料費が高価になるため、効果は期待できな
い。 Furthermore, the hardness of the sleeve obtained by adopting the above structure is improved by work hardening during final cold drawing, and the relationship between the drawing ratio and hardness is as shown in Figure 4, as the drawing ratio becomes larger. The hardness is improved and can be approximately twice as hard as the final heat treatment. Therefore, the hardness of the sleeve is improved, the wear resistance due to friction with the toner is improved, and the surface roughness is reduced by 1 to 2 μm.
The number of durable copies made with rough sleeves is also 5th.
As shown in the figure, a Vickers hardness of 220 is 1.5 times that of a heat-treated product, and a Vickers hardness of 300 is twice that of a heat-treated product. However, even if the above manufacturing method is introduced with a nickel content of 15% or more, the effect is not expected because the higher the nickel content, the lower the hardness and the higher the material cost for stainless steel. Can not.
発明の効果
以上のように本発明は、ステンレス鋼管のニツ
ケル成分率と、最終冷間引抜の絞り率を規制する
ことにより、耐久性が優れ、かつ汎用のステンレ
ス鋼でありながら、最終熱処理が不用なため安価
な磁気ブラシ現像用磁石ロールを供給することが
可能であり工業的価値の大なるものである。Effects of the Invention As described above, the present invention achieves excellent durability by regulating the nickel content of the stainless steel pipe and the reduction rate in the final cold drawing, and eliminates the need for final heat treatment even though it is a general-purpose stainless steel. Therefore, it is possible to supply an inexpensive magnetic brush developing magnet roll, which is of great industrial value.
第１図は磁気ブラシ現像用磁石ロールの使用状
態を示す説明図、第２図は本発明の一実施例にお
けるステンレススリーブのフエライト含有率特性
図、第３図は磁性スリーブを使用した黒ベタ画像
の状態図、第４図は本発明のステンレススリーブ
の硬度特性図、第５図は本発明の磁石ロール耐久
特性図である。
１……シヤフト、２……ロール状磁石、３……
スリーブ、４……トナー、５……感光体ドラム、
６……白ムラ画像。
Fig. 1 is an explanatory diagram showing how a magnetic roll for magnetic brush development is used, Fig. 2 is a ferrite content characteristic diagram of a stainless steel sleeve in an embodiment of the present invention, and Fig. 3 is a black solid image using a magnetic sleeve. FIG. 4 is a hardness characteristic diagram of the stainless steel sleeve of the present invention, and FIG. 5 is a durability characteristic diagram of the magnet roll of the present invention. 1... Shaft, 2... Roll magnet, 3...
sleeve, 4...toner, 5...photosensitive drum,
6...White uneven image.
Claims (1)
〜15％に規制した非磁性オーステナイト系ステン
レス鋼鋼管を使用し最終冷間引抜加工における引
抜絞り率を５〜25％範囲内に規制し冷間引抜後の
熱処理を廃止した表面硬度がビツカース硬度220
以上でフエライト含有率0.5％以下の円筒形のス
リーブ内部に回転可能な状態でロール状磁石を組
み込んだ磁気ブラシ現像用磁石ロール。1 As a cylindrical sleeve, the nickel content ratio is 10
Using a non-magnetic austenitic stainless steel pipe regulated to ~15%, the drawing area ratio in the final cold drawing process is regulated within the range of 5 to 25%, and heat treatment after cold drawing is eliminated.The surface hardness is 220 Bitkers hardness.
The above is a magnet roll for magnetic brush development in which a rolled magnet is rotatably incorporated inside a cylindrical sleeve with a ferrite content of 0.5% or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25129183A JPS60143605A (en) | 1983-12-29 | 1983-12-29 | Magnet roll for magnetic brush development |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25129183A JPS60143605A (en) | 1983-12-29 | 1983-12-29 | Magnet roll for magnetic brush development |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60143605A JPS60143605A (en) | 1985-07-29 |
| JPH031805B2 true JPH031805B2 (en) | 1991-01-11 |
Family
ID=17220617
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25129183A Granted JPS60143605A (en) | 1983-12-29 | 1983-12-29 | Magnet roll for magnetic brush development |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60143605A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2614084B2 (en) * | 1988-08-18 | 1997-05-28 | キヤノン株式会社 | Image forming device |
| CN101241340A (en) | 2003-10-09 | 2008-08-13 | 富士电机电子技术株式会社 | Electrophotograph developing roller and image forming device using the same |
-
1983
- 1983-12-29 JP JP25129183A patent/JPS60143605A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60143605A (en) | 1985-07-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |