Hey there! I’m a supplier of external turning cutters, and I’ve been in this game for quite a while. One of the most common questions I get from customers is how to develop cutting strategies for external turning cutters. Well, I’m here to share some insights based on my experience. External Turning Cutters
First off, let’s understand what external turning is. It’s a machining process where we use a cutting tool to remove material from the outer surface of a rotating workpiece. The goal is to achieve the desired shape, size, and surface finish. And the key to a successful external turning operation lies in having a well – thought – out cutting strategy.
Understanding the Workpiece Material
The first step in developing a cutting strategy is to know your workpiece material inside out. Different materials have different properties, and these properties greatly affect how we cut them.
For example, if you’re dealing with a soft material like aluminum, it’s relatively easy to cut. Aluminum has good machinability, which means we can use higher cutting speeds and feed rates. We can also get away with using a sharper cutting edge because the material doesn’t put too much stress on the tool.
On the other hand, when working with hard materials like stainless steel or titanium, things get a bit trickier. These materials have high strength and hardness, so we need to use lower cutting speeds to avoid excessive tool wear. We also might need to use a tougher cutting edge and apply more coolant to keep the temperature down during the cutting process.
Another factor to consider is the material’s microstructure. Some materials have a more homogeneous microstructure, which makes them easier to machine. Others may have inclusions or a non – uniform structure, which can cause problems during cutting, like uneven tool wear or poor surface finish.
Selecting the Right Cutting Tool
Once you understand the workpiece material, the next step is to choose the right external turning cutter. There are several types of cutting tools available, and each has its own advantages and disadvantages.
Carbide tools are very popular because they’re hard and can withstand high cutting temperatures. They’re great for cutting a wide range of materials, from aluminum to steel. We offer different grades of carbide tools, depending on the specific application. For example, if you’re cutting hard materials, you might want a grade with more cobalt content, which gives it better toughness.
Ceramic tools are another option. They’re extremely hard and can handle very high cutting speeds. However, they’re also brittle, so they’re more suitable for finishing operations on hard materials.
High – speed steel (HSS) tools are still used in some cases, especially for small – scale operations or when you need a tool that can be easily resharpened. They’re not as hard as carbide or ceramic, but they’re more flexible and can be a cost – effective choice for certain applications.
When selecting a cutter, you also need to consider the tool geometry. The rake angle, clearance angle, and nose radius all play important roles in the cutting process. A positive rake angle makes the cutting process easier and reduces cutting forces, but it may also make the cutting edge weaker. A negative rake angle increases the strength of the cutting edge but requires more cutting force. The nose radius affects the surface finish of the workpiece. A larger nose radius generally gives a better surface finish but may also increase the cutting forces.
Determining Cutting Parameters
Now that we’ve got the workpiece material and the cutting tool sorted out, it’s time to determine the cutting parameters. These include the cutting speed, feed rate, and depth of cut.
The cutting speed is the speed at which the cutting edge of the tool moves relative to the workpiece. It’s usually measured in surface feet per minute (SFM) or meters per minute (m/min). The cutting speed depends on the workpiece material and the cutting tool. As I mentioned earlier, for soft materials like aluminum, we can use higher cutting speeds, while for hard materials, lower speeds are required.
The feed rate is the distance the tool advances along the workpiece in one revolution. It’s measured in inches per revolution (IPR) or millimeters per revolution (mm/r). A higher feed rate means more material is removed in a shorter time, but it can also lead to a poorer surface finish and more tool wear.
The depth of cut is the thickness of the material removed in one pass. It’s measured in inches or millimeters. A larger depth of cut means more material can be removed quickly, but it also requires more cutting force and can cause more tool wear.
To determine the optimal cutting parameters, it’s a good idea to start with the manufacturer’s recommendations. Our company provides detailed cutting parameter charts for our external turning cutters. But these are just starting points. You may need to make some adjustments based on your specific machining conditions, such as the machine tool’s power and rigidity, the coolant used, and the desired surface finish.
Coolant and Lubrication
Coolant and lubrication are often overlooked but are crucial for a successful external turning operation. Coolant helps to reduce the temperature at the cutting edge, which can extend the tool life and improve the surface finish of the workpiece. It also helps to flush away the chips generated during cutting, preventing them from clogging the cutting area.
There are different types of coolants available, such as water – based coolants and oil – based coolants. Water – based coolants are more commonly used because they’re cost – effective and have good cooling properties. They also tend to be less messy than oil – based coolants. Oil – based coolants, on the other hand, provide better lubrication, which can be beneficial when cutting tough materials.
In addition to coolant, we can also use lubricants in the form of cutting oils or dry lubricants. Lubricants help to reduce friction between the tool and the workpiece, which can lower the cutting forces and improve the surface finish.
Monitoring and Adjusting
Once you’ve set up the cutting operation, it’s important to monitor the process closely. Keep an eye on the tool wear, the surface finish of the workpiece, and the cutting forces. If you notice any signs of excessive tool wear, like a chipped or worn – out cutting edge, or if the surface finish is not up to par, you may need to make some adjustments.
You can adjust the cutting parameters, such as reducing the cutting speed or feed rate, or you can change the cutting tool. Sometimes, a simple adjustment to the coolant or lubricant can also make a big difference.
Conclusion
Developing cutting strategies for external turning cutters is a complex but rewarding process. By understanding the workpiece material, selecting the right cutting tool, determining the optimal cutting parameters, using the right coolant and lubrication, and monitoring and adjusting the process, you can achieve better results in your external turning operations.
Grooving Inserts If you’re looking for high – quality external turning cutters and need more advice on cutting strategies, don’t hesitate to get in touch with me. I’m more than happy to help you with your machining needs and work together to develop the best solutions for your projects.
References
- "Machining Handbook" by Peter Beamonte
- "Cutting Tool Technology" by John Black
Small Craftsman (Shandong) Machine & Tools Co., Ltd.
Small Craftsman (Shandong) Machine & Tools Co., Ltd. is one of the most experienced external turning cutters manufacturers and suppliers in China, also supports customized service with low price. Please feel free to buy bulk high quality external turning cutters in stock here from our factory. Contact us for pricelist.
Address: No.9 Quanxin Rd., Sishui Economic Developing Zone, Jining, Shandong, China.
E-mail: 6196@ocutchina.com
WebSite: https://www.ocutooling.com/
