Lubrication Oil & Grease Portal of India

There have been great strides in machine tool design and cutting tool materials due to new industrial materials developed higher production demands and the ever-smaller tolerances to which components have to be machined. This has led to corresponding advances in cutting fluid technology. Cutting fluids play an important role in speeding up production by enabling increased rates of metal removal to be used, and by reducing or even eliminating problems associated with severe and hazardous machining operations.HPC has developed a number of cutting fluids, each grade selectively formulated to give optimum performance on a wide range of metals.

HPC cutting fluids have the following characteristics. These cause no rusting or corrosion of machine, work piece or tool.

• These cause no discoloration or staining.
• These do not smoke or fog in use.
• These do not have objectionable odour.
• These do not decompose chemically in use.
• These retain their physical property in use.
• These do not contain ingredients harmful to the operator.

WATER – MIX CUTTING FLUIDS: These products are Emulsifiable in water and are a blend of refined mineral oil base stocks, emulsifiers, additives and suitable bactericides.

Note: Soluble cutting oils are not recommended to be used for machining of magnesium and its alloys.

METAL CUTTING FLUIDS:

Preparation of soluble oil emulsion: In preparing the emulsion of soluble oils with water, the product is always added to the water and not vice versa to prevent inversion of the emulsion. The requisite quantity of product is added to two or three parts of water to form a concentrated emulsion, which is subsequently diluted with the requisite quantity of water. The emulsion is applied copiously to flood the work and the tool at the machining area. This ensures satisfactory performance.

Checking oil concentration: The oil concentration in an emulsion with hydrochloric acid or saturated salt solution such as epsom salt. By noting the oil quantity that has separated the volume of oil or water to be added in emulsion can be determined.

Control of offensive odour in soluble oil emulsion: Offensive odour sometimes develops during the use of soluble oils. In some instances, this has been accompanied by a change of the colour of the emulsion. These conditions are developed in most cases due to the presence of bacteria in water /emulsions. The source of these organisms are many such as sweeping from the shop floors, the source of water and its quality, and unhygienic practices in the shop such as spitting.

The under mentioned preventive measures are helpful for control of offensive odour

• Pre-treatment of water used in preparing emulsion
• Avoiding oil blanket on the surface of emulsion in the sump
• Aeration of emulsion
• Frequent removal of chips and fines from the sump
• Periodic cleaning of the coolant reservoir and system

Water hardness
Hardness in water is expressed as grains of calcium carbonate per gallon or parts of calcium carbonate per million parts of water.

Better emulsification soluble oils with hard water are obtained by softening the water prior to its use.

SELECTION OF CUTTING FLUIDS