In every manual for thread cutting, there's always a clear recommendation to use cooling lubricants for screw taps. This advice is not to be taken lightly! The process of thread cutting generates friction, which leads to increased heat, tool wear, and rough surfaces on the threads. Without proper cooling lubrication, you risk damaging both the tap and the workpiece.
When it comes to tap lubrication, there are numerous products available, each with unique features tailored for different applications. These range from varying consistencies to specific additives that offer benefits such as corrosion protection or improved lubrication performance. With so many options, it can be confusing. We’ll break down the differences and help you choose the right cooling lubricant for your needs.
Cooling lubricants for screw taps serve multiple purposes. Their main functions are cooling and lubricating, but these are not equally important in all situations. Depending on the machining process, one function may take precedence over the other. For example, higher cutting speeds require more emphasis on lubrication rather than cooling. Additionally, these lubricants assist in chip removal, ensuring that the material being cut is efficiently transported away.
The key roles of cooling lubricants for screw taps include:
- Cooling effect
- Lubricating effect
- Chip removal
Cooling lubricants are standardized according to DIN 51385, which categorizes them into water-miscible and non-water-miscible types. Water-miscible coolants are mixed with water and are particularly effective at dissipating heat. They often contain emulsifiers, antioxidants, and EP additives. Non-water-miscible coolants, typically based on mineral oils, focus more on lubrication and include additives like corrosion inhibitors and foam suppressants.
The choice of coolant depends on the material being machined. For steel, water-mixed coolants are commonly used, while harder alloys like INCONEL may require non-water-miscible options. Special care must be taken when working with magnesium or titanium, as certain coolants can cause dangerous reactions. For instance, using water-miscible coolants on magnesium can lead to the formation of hydrogen, which poses an explosion risk. In such cases, a high-pH coolant is recommended.
In industrial settings, a continuous and even supply of coolant is essential. Coolants can be delivered internally through the tool or externally via nozzles. For home or workshop use, applying the lubricant manually is sufficient, and reapplication is needed as required.
Choosing the right cooling lubricant involves considering factors like cutting conditions, the type of tap, and the material being worked on. While this is more critical in large-scale production, hobbyists can usually rely on universal products that are safe and effective for various applications. Always ensure the product is specifically designed for screw taps and purchased from a reliable source.
If you're looking for a high-quality cooling lubricant for screw taps, consider checking out the cutting paste from BAER, a trusted manufacturer of screw taps. It’s suitable for a wide range of materials, easy to use, and free from harmful substances like petroleum, chlorine, and sulfur. For more information or assistance, our customer service team is always here to help.
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