About cutting oil

What is cutting oil

Cutting oil is a type of “processing oil” that is used to cut or cut metal. The reason why oil is needed when cutting metal is that there are the following two advantages.

  • Prevents the cutting edge of the tool from becoming hot and high pressure and seizing

  • Maintains excellent tool sharpness

 

Type of cutting oil

Cutting oils are broadly divided into “water-insoluble cutting oils” and “water-soluble cutting oils”.

(Water-insoluble cutting oil is also called oil-based cutting oil or water-insoluble cutting oil)

Both are cutting oils, but they have different performance and must be selected according to the purpose.

water-insoluble cutting oils

water-insoluble cutting oils

 

Cutting oil performance

The following six points are important in comparing the performance of water-insoluble and oil-soluble cutting oils.

①Lubricity

Reduce friction, reduce machine friction and cutting force. Helps extend tool life and improve surface quality.

②Coolability

Reduces the temperature of the cutting tool and reduces machine friction. Helps extend tool life. In addition, reducing the temperature of the tool reduces thermal expansion and helps maintain machining accuracy.

③Rust prevention performance

Protects the cutting surface and suppresses rust.

④Durability

It affects the life of the cutting oil itself and the cost and effort of replacement.

⑤Workability

It is related to ease of handling.

⑥Fire Services Act

Danger of ignition, and about storage

 

 

Difference between water-soluble cutting oil and water-insoluble cutting oil

①Lubricity

water-soluble cutting oil

<

water-insoluble cutting oil

The oil type is superior in terms of lubricity. If lubrication is required for water-soluble cutting oil, emulsion type is recommended. When using other water-soluble cutting oils, sufficient care must be taken to maintain and maintain the lubricity of the machine.

 

 

②Coolability

water-soluble cutting oil

>

water-insoluble cutting oil

Cooling is best with water-soluble cutting oil. It is overwhelming compared to oil type. Water has a thermal conductivity about five times that of oil, indicating that water has a higher cooling effect than oil.

 

 

③Rust prevention performance

water-soluble cutting oil

<

water-insoluble cutting oil

Water-insoluble cutting oil has better rust prevention performance. Since water-soluble cutting oil is diluted with water and used, there is an overwhelming difference in the effects. Care must be taken because the emulsion type is the least effective in preventing rust among water-soluble cutting oils.

 

 

④Durability

water-soluble cutting oil

<

water-insoluble cutting oil

Cutting oil tends to be deteriorated by foreign substances. In addition, care must be taken with water-soluble cutting oils to prevent decay by bacteria.

 

 

⑤Workability

water-soluble cutting oil

>

water-insoluble cutting oil

Considering that there is no risk of smoke or ignition, and that the floor and work clothes are not easily contaminated, it seems that water-soluble is easier to work. However, care must be taken because water-soluble cutting oils generally have a greater effect on the skin.

 

 

⑥Fire Services Act

water-soluble cutting oil

>

water-insoluble cutting oil

Since water-soluble cutting oil is diluted with water and used, it is a “non-dangerous substance” that is not subject to the Fire Service Law when used. It is relatively easy to handle because it is not subject to fire concerns or regulated quantity of storage. However, some emulsions and undiluted solutions have a flash point, so care must be taken during storage.

 

 

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Comments for this article

  • 多田庄司 より:

    現在油性切削油を使っています。
    消防法の観点で水溶性切削油に切り替えを考えています。
    水溶性切削油を洗浄するにはどのようなものがあるのでしょうか?

    毒性が高いものは使用したくありません。

    • sankyo管理者 より:

      >>多田庄司様

      コメントありがとうございます。
      水溶性切削油を洗浄するには、基本的には水性の洗浄剤かお湯を使います(水よりもお湯のほうが落ちるため)。

      金属を洗浄する際はそのままだと錆びてしまうので、水切り剤を別途使用します。
      弊社でも水切り剤は製造していまして、メタルクリーナーW-19というものがございます。

      たまにアルコール系や炭化水素系でも洗浄をしている場合もありますが、ごくまれです。

  • 山田信晃 より:

    水溶性切削油の洗浄についてお伺いします。

    他のコメントの中に、水溶性切削油を洗浄するには、基本的には水性の洗浄剤かお湯を使用し、別途水切り剤を使用すると書いてありまが、私としては、会社にある溶剤(シンナー,アルコール、ホワイトガソリン)のいずれかにて対応したいと考えています。
    この3つの中でどれが水溶性切削液の洗浄に有効なのでしょうか。

    • sankyo管理者 より:

      >>山田信晃様

      コメントありがとうございます。
      3つ挙げていただいた、シンナー、アルコール、ホワイトガソリンの中では
      アルコールは水に混ざる性質を持ちますので、水溶性切削油も洗浄できるかと思いますが、完璧に落とされたい場合には専用の洗浄剤のご検討をお勧め致します。
      シンナーとホワイトガソリンは水に混ざりませんので、落とすことができません。

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