In the field of metal processing, the selection of lubricating and cooling media directly affects the processing quality and efficiency. Many practitioners often confuse grinding fluid with cutting fluid and even use them interchangeably, not realizing that there are essential differences between the two in terms of composition and function. This article will use the most concise language to help you quickly grasp the core differences between the two.
1. Component Differences: Additives determine the upper limit of functionality
Base liquid: water-soluble (emulsified type accounts for 70% of the market share), oil-soluble
Core additives: Extreme pressure agent (to cope with high cutting force), anti-adhesion agent (to reduce built-up edge), highly penetrating rust inhibitor
Typical formula: mineral oil + sulfide fatty acid ester + amine borate
Grinding fluid
Base liquid: 90% water-based (low-foam formula)
Special additives: Nano-scale lubricating particles (reduce grinding wheel clogging), compound bactericide (extend the anti-corrosion period by 3 times), pH stabilizer
Industry Trend: Biostable formula (COD value reduced by 40%)
2. Function Comparison: The Game of Cooling vs. Lubrication
Cutting fluid places more emphasis on:
Tool protection: Reduce the temperature of the rake face through extreme pressure lubricating film (up to 800℃→200℃)
Chip removal control: The viscosity is controlled at 5-15 CST to ensure smooth chip removal
Core tasks of grinding fluid:
Instantaneous cooling: The thermal conductivity coefficient needs to be > 0.5W/m·K (1.8 times that of the cutting fluid)
Surface integrity: Prevent grinding burn (white layer thickness control < 2μm)
3. Application Red Line: These scenarios must not be mixed
Scenarios where cutting fluid must be used:
Titanium alloy turning (cutting temperature over 1000℃)
Deep hole drilling (requiring high-pressure jet lubrication)
Scenarios where grinding fluid must be used:
Precision bearing raceway grinding (Ra < 0.2μm)
CBN grinding wheel processing (prone to glass transition reaction)
4. Misuse Cost: Warning from Measured Data
A case of mixed use in a certain transmission gear factory:
After replacing grinding fluid with cutting fluid:
The grinding wheel life is reduced by 60%
The roundness error of the workpiece exceeds 3 times
Cost per piece increased by 22%
