Hey there! As a supplier of CNC Turning, I've been dealing with all sorts of aspects related to this field. One crucial part of CNC turning is chip removal. It might not sound like a big deal at first, but it can actually have a huge impact on the quality of the machining process and the final product. In this blog, I'm gonna share some methods of chip removal in CNC turning that I've learned and used over the years.
1. Using Cutting Fluids
Cutting fluids are like the unsung heroes in the world of CNC turning. They do a lot more than just keep things cool. One of their main jobs is to help with chip removal. When we use cutting fluids, they create a sort of lubricating layer between the cutting tool and the workpiece. This reduces friction, which in turn makes it easier for the chips to break away from the workpiece.
There are different types of cutting fluids, like water-based and oil-based ones. Water-based cutting fluids are great because they're cost - effective and have good cooling properties. They can quickly carry away the heat generated during the cutting process, preventing the chips from welding back to the workpiece. Oil - based cutting fluids, on the other hand, offer better lubrication. They can reduce the wear and tear on the cutting tool and make the chip removal process smoother.
For example, when we're turning a piece of aluminum, a water - based cutting fluid might be a good choice. Aluminum chips are relatively soft and can be easily carried away by the fluid. But if we're working with a tougher material like stainless steel, an oil - based cutting fluid could be more suitable as it provides better lubrication to deal with the high cutting forces. You can learn more about the overall CNC turning process on our CNC Turning page.
2. Chip Breakers
Chip breakers are an essential tool in chip removal. They're designed to break the long, continuous chips into smaller, more manageable pieces. When the cutting tool has a chip breaker, it disrupts the flow of the chips as they're being formed. This causes the chips to curl and break at regular intervals.
There are different designs of chip breakers. Some are built directly into the cutting tool, while others can be added as an attachment. For instance, a grooved chip breaker has a series of grooves on the cutting edge of the tool. As the chips pass over these grooves, they're forced to bend and break. Another type is the step - type chip breaker, which creates a step in the chip flow path, causing the chips to break.
The advantage of using chip breakers is that they prevent the long chips from getting tangled around the cutting tool or the workpiece. This can improve the surface finish of the workpiece and also reduce the risk of damage to the tool. If you're interested in high - precision machining processes like those where chip breakers are crucial, check out our Multi - spindle Machining services.
3. Proper Tool Geometry
The geometry of the cutting tool plays a significant role in chip removal. The rake angle, clearance angle, and cutting edge radius all affect how the chips are formed and removed.
The rake angle is the angle between the face of the cutting tool and a reference plane. A positive rake angle makes the cutting process easier as it reduces the cutting force. This can lead to smaller, more easily manageable chips. However, a very large positive rake angle can also make the cutting edge weaker. On the other hand, a negative rake angle increases the strength of the cutting edge but may result in larger chips.
The clearance angle is the angle between the flank of the cutting tool and the workpiece. A proper clearance angle ensures that the tool doesn't rub against the workpiece, which can cause heat generation and poor chip removal.
The cutting edge radius also matters. A sharp cutting edge with a small radius can produce thinner chips, which are easier to remove. But a very sharp edge can wear out quickly, especially when cutting tough materials. So, we need to find the right balance in tool geometry for efficient chip removal.
4. High - Pressure Coolant Systems
High - pressure coolant systems are becoming more and more popular in CNC turning. These systems deliver the cutting fluid at a high pressure directly to the cutting zone. The high - pressure coolant can not only cool the cutting tool and the workpiece but also help in chip removal.
The force of the high - pressure coolant can push the chips away from the cutting area. It can break up large chips and carry them out of the machining zone more effectively. For example, in deep - hole turning operations, where chips can easily get stuck in the hole, a high - pressure coolant system can be a lifesaver. It can ensure that the chips are removed from the hole, preventing tool breakage and improving the quality of the hole.
We've found that using high - pressure coolant systems can significantly increase the productivity of our CNC turning operations. If you're looking for advanced machining solutions like this, you might be interested in our Automatic Bar Machining services.
5. Chip Conveyors
Once the chips are removed from the cutting zone, we need a way to collect and dispose of them. That's where chip conveyors come in. There are different types of chip conveyors, such as belt conveyors, chain conveyors, and screw conveyors.
Belt conveyors are simple and cost - effective. They use a moving belt to carry the chips from the machining area to a collection bin. Chain conveyors are more robust and can handle heavier chips. They use chains to move the chips along. Screw conveyors are great for removing chips from narrow spaces. They use a rotating screw to push the chips forward.
Having a good chip conveyor system in place can keep the machining area clean and organized. It can also prevent the chips from accumulating and causing problems in the CNC turning machine.
Conclusion
In conclusion, chip removal is a vital part of the CNC turning process. By using methods like cutting fluids, chip breakers, proper tool geometry, high - pressure coolant systems, and chip conveyors, we can ensure a smooth and efficient machining operation. Each method has its own advantages, and in many cases, we need to use a combination of these methods to achieve the best results.
If you're in the market for high - quality CNC turning services and want to learn more about how we handle chip removal and other aspects of the machining process, don't hesitate to get in touch with us. We're always ready to have a chat and discuss how we can meet your specific needs.
References
- "CNC Machining Handbook"
- "Cutting Tool Technology and Applications"