JP2006312219A - Processing method of water-soluble cutting oil - Google Patents
Processing method of water-soluble cutting oil Download PDFInfo
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- JP2006312219A JP2006312219A JP2005136132A JP2005136132A JP2006312219A JP 2006312219 A JP2006312219 A JP 2006312219A JP 2005136132 A JP2005136132 A JP 2005136132A JP 2005136132 A JP2005136132 A JP 2005136132A JP 2006312219 A JP2006312219 A JP 2006312219A
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- cutting oil
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- 239000010730 cutting oil Substances 0.000 title claims abstract description 63
- 238000003672 processing method Methods 0.000 title abstract 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 31
- 239000005332 obsidian Substances 0.000 claims abstract description 7
- 239000003921 oil Substances 0.000 claims abstract description 5
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 23
- 239000011941 photocatalyst Substances 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 6
- 230000001699 photocatalysis Effects 0.000 claims description 6
- 239000000843 powder Substances 0.000 abstract description 9
- 241000894006 Bacteria Species 0.000 abstract description 6
- 239000004408 titanium dioxide Substances 0.000 abstract description 5
- 230000003197 catalytic effect Effects 0.000 abstract 1
- 238000004821 distillation Methods 0.000 description 5
- 238000011084 recovery Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000010685 fatty oil Substances 0.000 description 4
- 239000010687 lubricating oil Substances 0.000 description 4
- 239000002480 mineral oil Substances 0.000 description 4
- 235000010446 mineral oil Nutrition 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000004094 surface-active agent Substances 0.000 description 4
- 239000003463 adsorbent Substances 0.000 description 2
- 230000002421 anti-septic effect Effects 0.000 description 2
- 229940064004 antiseptic throat preparations Drugs 0.000 description 2
- 229910000389 calcium phosphate Inorganic materials 0.000 description 2
- 239000001506 calcium phosphate Substances 0.000 description 2
- 235000011010 calcium phosphates Nutrition 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000001747 exhibiting effect Effects 0.000 description 2
- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical class [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 150000002978 peroxides Chemical class 0.000 description 2
- 239000003755 preservative agent Substances 0.000 description 2
- 230000002335 preservative effect Effects 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000001172 regenerating effect Effects 0.000 description 2
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 2
- 241001148471 unidentified anaerobic bacterium Species 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 108010022355 Fibroins Proteins 0.000 description 1
- 108010013296 Sericins Proteins 0.000 description 1
- 230000000844 anti-bacterial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 108091005899 fibrous proteins Proteins 0.000 description 1
- 102000034240 fibrous proteins Human genes 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
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- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Catalysts (AREA)
- Auxiliary Devices For Machine Tools (AREA)
Abstract
Description
本発明は、水溶性切削油の腐敗などを防止するための水溶性切削油の処理方法に関するものである。 The present invention relates to a method for treating a water-soluble cutting oil for preventing the water-soluble cutting oil from decaying.
旋盤、フライス盤、研磨盤等の工作機械では、切削工具の冷却や切削性、被切削物、機械の温度の上昇防止などの目的で切削油が使用されている。しかしながら、水溶性切削油の場合には、バクテリア等の細菌が発生して悪臭が生じやすい。かといって、数ヶ月単位で新しい切削油に交換すると、多大なコストがかかる。また、防腐剤を添加する方法もあるが、防腐剤は手が荒れやすく、かつ、高価であるがその効果は短期間しか維持できない。 In machine tools such as a lathe, a milling machine, and a polishing machine, cutting oil is used for the purpose of cooling and cutting performance of a cutting tool, work piece, and prevention of temperature rise of the machine. However, in the case of water-soluble cutting oil, bacteria such as bacteria are generated and bad odor is easily generated. However, if it is replaced with new cutting oil every several months, it costs a lot of money. There is also a method of adding a preservative, but the preservative tends to be rough and expensive, but its effect can only be maintained for a short period of time.
そこで、蒸留回収装置を用いて切削油を再生するなどの方法が提案されている（例えば、特許文献１参照）。
しかしながら、特許文献１に記載の方法では、設備の導入に多大な費用がかかるとともに、工作機械の周りに蒸留回収装置を設置するためのスペースを必要とするという問題点がある。 However, the method described in Patent Document 1 has a problem that it takes a lot of money to install equipment and requires a space for installing a distillation recovery device around the machine tool.
以上の問題点に鑑みて、本発明の課題は、腐敗などに起因する悪臭の発生を防止するときでも、多大な費用やスペースを必要としない水溶性切削油の処理方法を提供することにある。 In view of the above problems, an object of the present invention is to provide a method for treating water-soluble cutting oil that does not require a large amount of cost and space even when the generation of malodor caused by decay or the like is prevented. .
上記課題を解決するために、本発明に係る水溶性切削油の処理方法では、使用済みの水溶性切削油と光触媒とを接触させることを特徴とする。本発明において、使用済みの水溶性切削油と光触媒とを接触させるとは、使用済みの水溶性切削油を光触媒に接触させる形態の他、新規の水溶性切削油に光触媒を添加しておく形態も含む意味である。また、本発明において、「水溶性切削油」とは、「鉱油や脂肪油などの水に溶けない成分と界面活性剤とを含むもの」「界面活性剤などの水に溶ける成分のみからなるもの」の双方を含む意味であり、鉱油や脂肪油などが配合されていないものも含む意味である。 In order to solve the above-described problems, the water-soluble cutting oil treatment method according to the present invention is characterized in that a used water-soluble cutting oil and a photocatalyst are brought into contact with each other. In the present invention, the contact of the used water-soluble cutting oil with the photocatalyst means a form in which the photocatalyst is added to a novel water-soluble cutting oil in addition to the form in which the used water-soluble cutting oil is brought into contact with the photocatalyst. It also includes the meaning. Further, in the present invention, the “water-soluble cutting oil” is “consisting of a water-insoluble component such as mineral oil or fatty oil and a surfactant” or “water-soluble component such as a surfactant”. ”And also includes those not containing mineral oil or fatty oil.
本発明では、酸化チタンなど光触媒を利用して水溶性切削油を処理するため、水溶性切削油の腐敗などを防止でき、水溶性切削油からの悪臭成分の発生を防止することができる。 In the present invention, since the water-soluble cutting oil is treated using a photocatalyst such as titanium oxide, it is possible to prevent the water-soluble cutting oil from decaying and to prevent the generation of malodorous components from the water-soluble cutting oil.
本発明において、前記水溶性切削油と前記光触媒とを接触させるにあたっては、例えば、工作機械で使用されている前記水溶性切削油に対して光触媒を投入すればよい。 In the present invention, when bringing the water-soluble cutting oil into contact with the photocatalyst, for example, the photocatalyst may be added to the water-soluble cutting oil used in a machine tool.
本発明において、前記光触媒は、例えば、酸化チタンである。ここで、前記光触媒は、可視光、あるいは紫外光および可視光の双方により光触媒作用を発揮することが好ましい。 In the present invention, the photocatalyst is, for example, titanium oxide. Here, it is preferable that the photocatalyst exhibits a photocatalytic action by visible light or both ultraviolet light and visible light.
本発明において、前記水溶性切削油の液面上に浮上している浮上油については、黒曜石で吸着することが好ましい。 In the present invention, the floating oil floating on the liquid surface of the water-soluble cutting oil is preferably adsorbed by obsidian.
本発明では、光触媒作用を利用して水溶性切削油を処理するため、例えば、工作機械の切削油タンクなどに酸化チタンなどの光触媒を添加するだけで、水溶性切削油の腐敗などを防止でき、水溶性切削油からの悪臭成分の発生を防止することができる。また、酸化チタンなどの光触媒は、防腐剤と違って、手を荒らすことがなく、かつ、その効果は長期間にわたって維持する。さらに、蒸留回収装置と違って、多大な設備費用や設置スペースを必要としない。 In the present invention, since water-soluble cutting oil is processed using photocatalytic action, for example, the addition of a photocatalyst such as titanium oxide to a cutting oil tank of a machine tool can prevent the water-soluble cutting oil from decaying. Generation of malodorous components from the water-soluble cutting oil can be prevented. Further, unlike antiseptics, photocatalysts such as titanium oxide do not disturb the hands and maintain their effects over a long period of time. Furthermore, unlike the distillation recovery apparatus, it does not require a large facility cost and installation space.
本発明の処理対象となる水溶性切削油は、鉱油や脂肪油などの水に溶けない成分と界面活性剤とを含むもの、あるいは界面活性剤などの水に溶ける成分のみからなる切削油であり、かかる切削油は、工作機械において、工具の潤滑を向上させ、摩擦による過熱などの防止に使用される。 The water-soluble cutting oil to be treated in the present invention is a cutting oil comprising a component that is insoluble in water, such as mineral oil or fatty oil, and a surfactant, or a cutting oil consisting only of a component that is soluble in water, such as a surfactant. Such cutting oil is used in machine tools to improve tool lubrication and prevent overheating due to friction.
このような水溶性切削油は、例えば、工作機械において切削油タンクに貯留されており、切削油タンクに貯留されていた水溶性切削油は、ワークへの工具の加工点に向けて吐出される。また、噴射された水溶性切削油は、回収されて切削油タンクに戻され、再び、ワークへの工具の加工点に向けて吐出される。 For example, such a water-soluble cutting oil is stored in a cutting oil tank in a machine tool, and the water-soluble cutting oil stored in the cutting oil tank is discharged toward a processing point of the tool on the workpiece. . The injected water-soluble cutting oil is collected and returned to the cutting oil tank, and is again discharged toward the machining point of the tool on the workpiece.
このような工作機械において、水溶性切削油は、水分を含んでいるため、その初期から鉱油や脂肪油などが配合されている場合、あるいはその使用途中において油などの汚れが混入した場合のいずれの場合においても、使用していくうちにバクテリアなどが発生して腐敗し、悪臭が発生する。 In such machine tools, water-soluble cutting oil contains moisture, so either when mineral oil or fatty oil is blended from the beginning, or when dirt such as oil enters during use Even in this case, bacteria and the like are generated and decayed with use, and a bad odor is generated.
そこで、本形態では、切削油タンクに対して、光触媒として酸化チタンを投入し、使用済みの水溶性切削油を酸化チタンに接触させる。その際、酸化チタンは、粉体のまま、あるいは通液性を備えた袋や容器に収納された状態で切削油タンクに投入される。酸化チタンを粉体のまま投入した場合でも、酸化チタンはタンク底に沈むので、水溶性切削油の吐出などに支障はない。 Therefore, in this embodiment, titanium oxide is introduced as a photocatalyst into the cutting oil tank, and the used water-soluble cutting oil is brought into contact with titanium oxide. At that time, the titanium oxide is put into the cutting oil tank as powder or in a state of being stored in a bag or container having liquid permeability. Even when titanium oxide is charged in powder form, titanium oxide sinks to the bottom of the tank, so there is no problem in discharging water-soluble cutting oil.
ここで、酸化チタン(二酸化チタン)は、紫外光を受けて有機物の分解や酸化作用を発揮して、水溶性潤滑油の腐敗を防止する。従って、この場合、ＵＶランプにより、酸化チタンに紫外線を照射することが好ましい。 Here, titanium oxide (titanium dioxide) receives ultraviolet light and exhibits the decomposition and oxidation action of organic substances to prevent the water-soluble lubricating oil from decaying. Therefore, in this case, it is preferable to irradiate the titanium oxide with ultraviolet rays by a UV lamp.
また、酸化チタンのうち、二酸化チタンと過酸化物との複合材料や、過酸化物などで表面を処理した酸化チタンは、紫外光だけでなく可視光によっても光触媒作用を発揮して有機物を分解し、水溶性潤滑油の腐敗を防止する。従って、この場合、可視光を受ける条件が整っておればＵＶランプなどを用いる必要はない。ここで、可視光によっても光触媒作用を発揮する光触媒は、以下の方法でも製造できる。すなわち、酸化チタンの粉体を処理液と接触させて酸化チタンの粉体の表面を多孔性リン酸カルシウムで被覆して光触媒を製造する際、処理液中に、絹からセリシンを除去して得たフィブロインなどの繊維状蛋白質を含ませておく。このような光触媒では、酸化チタンが多孔性リン酸カルシウムで被覆されているとともに、酸化チタンが一部露出した状態にある。ここで、酸化チタンの結晶化度を高めておけば、紫外光だけでなく可視光によっても光触媒作用を発揮して有機物を分解し、水溶性潤滑油の腐敗を防止する。 In addition, among titanium oxides, titanium dioxide and peroxide composite materials and titanium oxides whose surfaces are treated with peroxides, etc., decompose organic substances by exhibiting photocatalytic action not only with ultraviolet light but also with visible light. And prevent the water-soluble lubricating oil from decaying. Therefore, in this case, it is not necessary to use a UV lamp or the like if conditions for receiving visible light are in place. Here, the photocatalyst exhibiting the photocatalytic action even by visible light can be produced by the following method. That is, when producing a photocatalyst by contacting the titanium oxide powder with the treatment liquid and coating the surface of the titanium oxide powder with porous calcium phosphate, the fibroin obtained by removing sericin from the silk in the treatment liquid Add fibrous protein such as In such a photocatalyst, titanium oxide is covered with porous calcium phosphate, and titanium oxide is partially exposed. Here, if the crystallinity of titanium oxide is increased, the photocatalytic action is exhibited not only by ultraviolet light but also by visible light to decompose organic substances and prevent the water-soluble lubricating oil from decaying.
このような酸化チタンによる腐敗の防止は、例えば、一般細菌や嫌気性細菌などの微生物を殺菌することによる効果と考えられる。また、嫌気性細菌のうち、悪臭原因物質の発生を促進する硫酸還元菌に対して特に優れた殺菌効果を発揮するためと考えられる。さらに、悪臭の原因となる硫化水素を酸化させてその発生を防止しているとも考えられる。 Such prevention of corruption by titanium oxide is considered to be an effect of sterilizing microorganisms such as general bacteria and anaerobic bacteria. Further, it is considered that among anaerobic bacteria, a particularly excellent bactericidal effect is exhibited against sulfate-reducing bacteria that promote the generation of malodor-causing substances. Furthermore, it is thought that the generation | occurrence | production is prevented by oxidizing the hydrogen sulfide which causes a malodor.
このように本形態では、水溶性切削油に微量の酸化チタンを投入するだけで水溶性切削油の腐敗、およびそれに起因する悪臭の発生などを確実に防止できる。このため、本形態によれば、工作機械の切削油タンク内に酸化チタンを定期的に混入するだけで、水溶性切削油を長期間にわたって使用でき、水溶性切削油を定期的に交換する必要がないので、コストダウンを図ることができる。また、酸化チタンなどの光触媒は、防腐剤と違って、手を荒らすことがなく、かつ、その効果は長期間にわたって維持する。 As described above, in this embodiment, it is possible to reliably prevent the water-soluble cutting oil from being spoiled and the generation of bad odor due to it by simply adding a small amount of titanium oxide to the water-soluble cutting oil. For this reason, according to this embodiment, the water-soluble cutting oil can be used for a long period of time only by periodically mixing titanium oxide into the cutting oil tank of the machine tool, and the water-soluble cutting oil needs to be periodically replaced. Because there is no, cost can be reduced. Further, unlike antiseptics, photocatalysts such as titanium oxide do not disturb the hands and maintain their effects over a long period of time.
さらに、本形態によれば、水溶性切削油を再生するための蒸留回収設備などが不要であるため、多大な設備投資が不要であり、かつ、工作機械の周りに蒸留回収装置などを配置するスペースを確保する必要もない。 Furthermore, according to the present embodiment, a distillation recovery facility for regenerating the water-soluble cutting oil is unnecessary, so that a large capital investment is unnecessary, and a distillation recovery device is disposed around the machine tool. There is no need to secure space.
なお、水溶性切削油を使用していくと、工作機械の摺動面に用いられていた潤滑油や、ワークに付着していた油が水溶性切削油の表面上に浮上油として浮いてくる。このような場合には、切削油タンクに吸着材を投入する。このような吸着材としては、黒曜石の粉体が好ましい。その場合、黒曜石は、粉体のまま、あるいは通液性を備えた袋や容器に収納された状態で切削油タンクに投入される。黒曜石を粉体のまま投入した場合でも、黒曜石の粉体はタンク底に沈むので、水溶性切削油の吐出などに支障はない。 If water-soluble cutting oil is used, the lubricating oil used on the sliding surface of the machine tool and the oil adhering to the workpiece will float on the surface of the water-soluble cutting oil. . In such a case, the adsorbent is put into the cutting oil tank. Such an adsorbent is preferably obsidian powder. In that case, obsidian is put into the cutting oil tank as powder or in a state of being stored in a bag or container having liquid permeability. Even if obsidian is charged as powder, obsidian powder sinks to the bottom of the tank, so there is no problem in discharging water-soluble cutting oil.
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