Is CNC Lathe Good For Ferrous Metal
Ferrous metals are important in product development. They are durable, have high strength, and do not break under stress. Furthermore, their magnetic properties make them stand out. Ferrous metals are strongly attracted to magnetic fields which improves part performance in many applications. However, the hardness and tensile strength of ferrous metals limits how easy one can machine them. This shortcoming makes many wonder how effective CNC lathes can cut through ferrous metals.
While it is possible to work on ferrous metals using CNC lathes, you should be aware of the benefits and limitations of this operation. This article will explain the reasons CNC lathes are ideal for ferrous metals, CNC lathing considerations to get the best results, and applications of CNC lathes on ferrous metals.
What is a CNC Lathe
A CNC lathe is an advanced machine used to create accurate and high-quality components. This machine is made up of a spindle, tool turret, control panel, and chuck as the major components. CNC lathes work by mounting the material stock on a rotating spindle. The workpiece rotates over the stationary tool that engages and disengages which results in a cutting action. The final products are repeatable and with no defects.
Furthermore, there are many operations you can perform with a CNC lathe. The most common are turning, drilling, grooving, threading, and reaming.
Turning: Turning is the most popular CNC lathing operation. Here, the tool moves parallel to the workpiece to remove material from its outer or inner diameter. Based on the shape of the surface, turning can be straight, taper, or contour.
Drilling: In CNC drilling, what you do is create large holes. The holes have different depths and diameters depending on the size of the drill bit one is using. These drilled holes are usually used with bolts and nuts during part assembly.
Grooving: You can also refer to grooving as recessing. Grooving describes when holes with boundaries are made on a cylindrical piece. The grooving operation can occur on the face, along the outer diameter, or within a hole.
Threading: The threading process uses a tap and die to cut threads into a workpiece. The threads serve as a joining mechanism as they allow fasteners to fit into them. Note that the threads can be made internally or externally.
Reaming: With CNC reaming, you do not create a hole from scratch. What you do is to enlarge an existing one using a reamer. This will ensure the holes are of precise diameter and give them a smoother finish.
What is Ferrous Metal
Ferrous metals are a group of engineering materials that contain iron as the major element. Depending on the particular type, ferrous metals have varying quantities of other components including carbon, manganese, chromium, molybdenum, and nickel. These additional elements help to improve the physical and mechanical properties of ferrous metals. Because of the high iron content, most ferrous metals have remarkable magnetic properties. Additionally, they are strong and durable.
The major types of ferrous metals used in part manufacturing include stainless steel, carbon steel, cast iron, and wrought iron.
Stainless Steel: The different forms of stainless steel contain iron with chromium and nickel as the major alloying elements. They are corrosion-resistant and have an attractive appearance.
Carbon Steel: As the name implies, the major alloying element is carbon. Based on the carbon content, you can classify this metal as low, medium, or high-carbon steel. They are strong and easy to machine.
Cast Iron: Cast iron contains approximately 4% carbon and 2% silicon with the rest being iron. It comes in various forms including gray, white, malleable, and ductile. The various cast iron types are strong and impact-resistant.
Wrought Iron: Wrought iron has a very high iron content and can be up to 99%. Though soft, wrought iron is strong with a high tensile strength. The good thing about wrought iron is that it gets stronger the more you work on it.
Is a CNC Lathe Good for Ferrous Metal?
Ferrous metals are good candidates for the different CNC lathing operations. The machine accurately cuts through these metals to produce parts with intricate shapes. There are many reasons why CNC lathes are ideal for ferrous metals. The machine can handle their hardness and work on even the most complex features and designs.
Furthermore, CNC lathes are automated and require little to no human intervention. Hence, they are efficient for both small and large-volume production. Another reason you should go for CNC lathes when performing operations on ferrous metals is the stability of the cutting tools. These rigid tools prevent marks on the workpiece and result in a high-quality finish.
Considerations for Machining Ferrous Metals on CNC Lathes
While machining ferrous metals using CNC lathes is straightforward, there are certain considerations you should know to get the best results. Let’s look at some of these tips and best practices
Cutting Tool Geometry and Material
The properties of the cutting tool you use will determine your CNC lathing result. Because of the hardness level of most ferrous metals, tools with a positive rake angle are the ideal ones. Furthermore, you should consider the tool material. Consider going for high-carbide tools and those made with cubic boron nitride or high-speed steel.
Machining Parameters
When working on ferrous metals with CNC lathes, always optimize important machining parameters such as spindle speed, feed rate, and depth of cut. However, the spindle speed you use for ferrous metals should be relatively low to prevent overheating and thermal damage. Additionally, use higher fee rates and multiple passes at moderate depths to avoid defects.
Coolant and Lubrication
When compared to nonferrous metals, the ferrous types have a higher tendency to generate heat during CNC machining. For this reason, you must prioritize the use of coolants and lubricants. There are different types of CNC coolants available and they can be water or oil-based. You either apply the coolants continuously or as a mist.
Chip Control
Using ferrous metals on CNC lathes will inevitably produce chips. You need a proper chip control system for both the continuous and discontinuous types. These may entail using a chip breaker to reduce the size of the chips which aids ease of removal. Furthermore, a good coolant system can help flush out chips from the work area.
Applications of CNC Lathe on Ferrous Metal
Many manufacturing industries use CNC lathes when processing ferrous metals. Let’s look at some of these industries
Automotive Industry
The automotive industry uses ferrous metals a lot because of their hardness and impact resistance. The components from these metals must be accurately produced to ensure the safety of the passengers. CNC lathing makes repeatable and consistent parts such as engine components, axles, and brake systems.
Aerospace Industry
The use of CNC lathes to shape ferrous metals in the aerospace sector is nothing new. The result is complex shaped parts with exceptional strength. CNC lathing is accurate and can meet the strict tolerance requirements in the aerospace industry. Some examples of ferrous metal components include turbine discs, shafts, structural fasteners, and bushings.
Tool and Die Making
Ferrous metals are the material of choice when making tools, molds, and dies. When manufacturing these components, it is important to use an accurate and consistent method. CNC lathing meets all these requirements because of the precise cavity creation. Additionally, the top-notch surface finishes the machine gives molds and dies make it possible to produce high-quality parts.
Medical and Healthcare
CNC lathes are the mainstay machines when producing medical equipment that are cylindrical or conical. These machines manufacture the parts exactly to specifications because programming languages control the movement of the cutting tools. Examples of medical components made of stainless steel and other nonferrous metals include scalpels, forceps, bone marrow implants, and clamps.
Conclusion
Ferrous metals such as stainless steel, carbon steel, and cast iron are difficult to machine especially for beginners. However, you can still use CNC lathes on them and get high-quality results. When working with CNC lathes to process ferrous metals, make sure you use the right tool geometry and material. Furthermore, you should also optimize the machining parameters and prioritize coolants and lubricants to avoid defects and dimensional inaccuracies. Do you have further questions and clarifications? Reach to a reputable CNC machining service provider today.
