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SECRETS TO CHOOSING CNC MACHINING OIL TO EXTEND TOOL LIFE AND OPTIMIZE PRODUCTION COSTS

In the era of precision mechanical processing, CNC machines play the role of the backbone of every production workshop. However, a reality that any business owner must face is the extremely high cost of replacing cutting tools (milling, turning, drilling). How to extend tool life while ensuring the surface finish of the part? The answer lies in choosing the right metalworking oil.

Below are in-depth tips from the technical team at Chang Tai (TP Oil) to help you optimize your operation process.

1. Understand the interaction between workpiece material and cutting oil

Each type of metal has different mechanical and physical properties, thus requiring completely different lubrication and cooling needs:

• For Carbon steel and iron: These are common materials. You should choose oil lines such as TP-68. This type of oil has good adhesion, reducing friction at the contact point between the tool tip and the workpiece.

• For Stainless Steel (Inox): Stainless steel has hard properties and generates extreme heat during machining, easily causing drill tip burning or tool chipping. In this case, specialized oil lines such as TP-INOX from Chang Tai are a mandatory choice thanks to their high extreme pressure (EP) additive content, helping to protect the tool tip even under harsh temperature conditions.

2. Balancing between “Cooling” and “Lubrication” capabilities”

Operators need to clearly distinguish between two main types of oil:

• Neat Cutting Oil: The biggest advantage is its excellent lubricating ability, helping achieve an extremely high surface finish on parts. This oil line is commonly used for heavy-duty, low-speed machining processes.

• Soluble Oil: Used when cutting speeds are high, prioritizing cooling to prevent thermal deformation of tools. However, when using soluble oil, controlling the mixing ratio (usually from 5% to 10%) is crucial to ensure no rusting occurs on the machine table and workpiece.

3. Importance of Extreme Pressure (EP) Additives

During the cutting process, pressure at the tool tip can reach thousands of kg/cm2. Without EP additives, the oil film will break, leading to direct metal-to-metal contact and rapid tool wear. Our products TP Oil are always enhanced with advanced EP additive systems, creating an ultra-thin yet extremely durable protective film that prevents “built-up edge” (workpiece material sticking to the cutting edge) – a leading cause of CNC tool failure.

4. Control of bacteria and odor – An indirect factor in protecting the machine

With soluble oil lines, oil spoilage (due to bacterial growth) not only causes unpleasant odors but also alters the solution's pH. When pH drops, anti-rust and lubricating properties are lost, leading to chemical corrosion of tools. Using machining oil from Chang Tai gives you greater peace of mind thanks to superior antibacterial technology, extending solution life and thereby protecting the oil supply system and tools more durably.

5. Maintenance tips to extend tool life

• Regular chip filtration: Small metal chips suspended in the oil can return to “attack” the cutting edge during the next cut. Ensure your CNC machine's filtration system is always functioning well.

• Check oil concentration: Use a refractometer to check oil concentration daily. Too low a concentration causes rust and tool wear, while too high a concentration leads to waste and skin irritation for machinists.

Conclusion

Choosing the right machining oil is not just a cost, but a smart investment. With our product line TP Oil from Chang Tai Co., Ltd., we are committed to providing the optimal solution for each specific material, helping businesses reduce 20% – 30% of annual tool replacement costs.

Are you facing issues with surface finish or excessively short tool life? Contact Chang Tai immediately for expert consultation and free sample testing!

• Hotline: 0902 903 720

• Address: 140 Phan Anh, Tan Phu District, Ho Chi Minh City

• Website: https://www.changtai.com.vn/