What are the properties of cutting fluids?

The desirable properties of cutting fluids in general are (Boston, 1952) 1) High thermal conductivity for cooling 2) Good lubricating qualities 3) High flash point, should not entail a fire hazard 4) Must not produce a gummy or solid precipitate at ordinary working temperatures 5) Be stable against oxidation.

What are cutting fluids and its uses?

Cutting fluid is a fluid that is mainly used to remove the heat produced during the metal cutting and other machining processes. It is also used as a lubricant in some cases. They are also used for improving the cutting condition and also the tool life.

What is cutting fluid?

: a fluid used especially for cooling, lubrication, rust prevention, or chip flushing in a machine metal-cutting operation or for other special effects in other metal working operations.

What is the major benefit of cutting fluids that contain water?

soluble, emulsifiable, or water-miscible oils. What is the major benefit of cutting fluids that contain water? The cooling rate of soluble oil is much higher than straight oil.

What are the four types of cutting fluids?

There are various kinds of cutting fluids, which include oils, oil-water emulsions, pastes, gels, aerosols (mists), and air or other gases.

What are the functions of cutting fluids in metal cutting practice?

Commonly, the use of cutting fluid can decrease cutting temperature, reduce the friction between tool and workpiece, extend tool life, and improve machining efficiency and surface quality.

What are the classification of cutting fluids?

fluids can be classified into three main categories, namely oil-based, aqueous-based, and gas-based, as shown in Fig. 1. Oil-based cutting fluids are preferable when a good lubricating property is required, whereas aqueous-based cutting fluids are desirable where cooling and lubricating properties are essential.

What are the principal lubricating mechanisms by which cutting fluids work?

There are two lubricating mechanisms that are believed to be effective in metal cutting: (1) boundary lubrication, which involves the formation of a thin fluid film to help separate and protect the contacting surfaces, and (2) extreme pressure lubrication, in which a thin solid layer of a salt such as iron sulfide is …

What is the primary reason for using cutting lubricant?

The main purpose of using cutting fluid is to decrease cutting temperature, reduce friction between tool and workpiece, extend tool life, and improve machining efficiency and surface quality.

What are the factors that determine selection of cutting fluid?

The selection of suitable cutting fluid is affected by mainly three factors in machining operations. These are the types of machining process, workpiece materials and cutting tool materials. The combination of these three influential factors would provide basic information for selecting the suitable cutting fluid.

What are the 5 main functions of coolant in machining?

The critical functions of coolant in the machining process include:

  • Reducing and removing the heat build-up in the cutting zone and workpiece.
  • Provides lubrication to reduce friction between the tool and removal of the chips.
  • Flushes away chips and small abrasive particles from the work area.
  • Protects against corrosion.

Which of the following properties should a cutting fluid possess Mcq?

It should have high viscosity. It should have a non-foaming tendency. It should be stable at low temperature.

Which of the following are the properties of lubricants?

A good lubricant generally possesses the following characteristics:

  • A high boiling point and low freezing point (in order to stay liquid within a wide range of temperature)
  • A high viscosity index.
  • Thermal stability.
  • Hydraulic stability.
  • Demulsibility.
  • Corrosion prevention.
  • A high resistance to oxidation.

What are the functions served by cutting fluid give broad classification of cutting fluid and explain each in detail?

Classification of Cutting Fluids:

Their purpose is to decrease the friction between chip and tool. The solid cutting fluids are in the form of free machining metals additives to the work material, surface treatment to tool faces or finely ground solid lubricants deposited on a tool from a liquid or a gaseous stream.

What is the Colour of cutting fluid?


A transparent, green tinted cutting oil used on ferrous and non-ferrous metals. Protects against staining and corrosion of machine tool components and the metalworking operation.

What are the methods by which cutting fluids are applied in a machining operation?

Drilling, broaching, milling, threading with high speed steel tools are typical examples of these operations where the use of cutting fluids is essential. Another important application of cutting fluid is in operations where low surface roughness and/or tight dimensional tolerances are required.

What are the factors that affect how a cutting tool performs?

Nature of Cutting.

  • Factor # 1. Cutting Speed:
  • Factor # 2. Physical Properties of Work Piece:
  • Factor # 3. Area of Cut:
  • Factor # 4. Ratio of Feed to Depth of Cut (f/d):
  • Factor # 5. Shape and Angles of Tools:
  • Factor # 6. Effect of Lubricant:
  • Factor # 7. Nature of Cutting:

What metal cutting issues are caused by a lack of lubrication?

This opposing force, in the absence of lubrication, generates a considerable amount of heat between the tool and the workpiece [1] . The tool’s surface will wear and lose its strength in addition to the reduced workpiece precision and uniformity. …

What is working principle of lathe machine?

Lathe machine is one of the most important machine tools which is used in the metalworking industry. It operates on the principle of a rotating work piece and a fixed cutting tool. The cutting tool is feed into the work piece which rotates about its own axis causing the workpiece to form the desired shape.

What do you mean by machine tool?

machine tool, any stationary power-driven machine that is used to shape or form parts made of metal or other materials.

What are the important characteristics of materials used for cutting tools?

Cutting tool material

  • hardness, hot hardness and pressure resistance.
  • bending strength and toughness.
  • inner bonding strength.
  • wear resistance. oxidation resistance. small prosperity to diffusion and adhesion. abrasion resistance. edge strength.

What is the most commonly used cutting fluid for metals?

Cutting Fluids for Turning, Milling, Drilling and Tapping

Material to be Cut Turning
Alloy Steelsb Soluble Oil
Brass Soluble Oil (75 to 90 Percent Water) (or) 30 Percent Lard Oil with 70 Percent Mineral Oil
Tool Steels and Low-carbon Steels Soluble Oil
Copper Soluble Oil

What is the function of cutting fluid Mcq?

The functions of cutting fluids are: To cool the tool as well as the workpiece. To reduce the friction between the chip and the tool face by providing lubrication.

Which is the not type of cutting fluid?

In machining cast iron, no cutting fluid is required. … Explanation: Water miscible fluids form mixtures ranging from emulsions to solutions, which due to their high specific heat, high thermal conductivity, and high heat of vaporisation, are used on about 90% of all metal cutting and grinding operations.

What are the desirable properties of a coolant Mcq?

The desirable properties of an ideal refrigerant are:

  • Low boiling point.
  • Low freezing point.
  • High critical temperature.
  • High latent heat of vaporization.
  • Low specific heat of liquid.
  • Low specific volume of vapour.
  • Noncorrosive metal.
  • High heat-transfer coefficient.

What are the types of lubricants and their properties?

Lubricants are classified into four types: oil, grease, penetrating lubricants, and dry lubricants. The two most common lubricants you’ll encounter on a daily basis are oil and grease, but your facility will still use dry and penetrating lubricants.

What are the physical properties of lube oil?

Important Lube Oil Properties to be Considered While Choosing Marine Lube Oil for Your Ship

  • Important Properties of Lube Oil. …
  • Alkalinity. …
  • Oxidation resistant. …
  • Load carrying capacity. …
  • Thermal conductivity. …
  • Detergency. …
  • Disperency. …
  • High Flash Point.

Which of the following is not the properties of lubricants?

Explanation: None. 4. Viscosity varies with the temperature and hence if a surface to be lubricated is normally at high temperature it should be supplied with oil of higher viscosity. Explanation: None.

How are cutting fluids maintained to prevent rancidity?

Cleanliness, proper concentration, and aeration of a water- based metalworking fluid mix help to maintain its rancidity control properties during use.

How does a lubricant and cutting fluid differ from each other?

The key difference between cutting fluid and lubricant is that cutting fluids can lubricate the interface between the cutting tool’s cutting edge and the chip, whereas lubricant can lubricate between hard materials by reducing the friction between the objects.

What function should a lubricant perform in manufacturing process?

The main function of most lubricants is to reduce friction and wear between moving surfaces and to abstract heat. They also have to remove debris from the contact area (e.g., combustion products in an engine cylinder) or swarf in metal-cutting operations (e.g., in metal-working fluids).

What are soluble cutting fluids?

For water-based cutting oils, there are two types you should know. They are soluble cutting oil and semi-synthetic cutting oil. Soluble cutting oils contain 50% to 80% mineral oils which form a milky white emulsion when mixed water. … It can effectively reduce oil mist and oil smoke during CNC machining.

Is cutting oil water soluble?

Water-soluble cutting oils are supplied as concentrates and the user must prepare the oil emulsion by mixing the concentrate with water. When using oil emulsions, the lubricating and corrosion protecting properties of the oil are combined with the cooling property of water.

How do you use cutting fluids?

Metalcutting Fluids – YouTube