CNC machining is one of the most commonly used manufacturing processes that exists today. From automotive parts to aerospace systems, CNC is extremely important for creating all sorts of components with accuracy.
Although the concept for CNC machining (Computer Numerical Control) is not new, the application of it certainly is. Automation, digitalisation, and more accurate engineering mean that CNC machining is becoming a smarter and more scalable production method.
This article covers what CNC machining is and where it’s used, and how it’s being adopted in modern manufacturing.
What Is CNC Machining?
CNC machining is a type of subtractive manufacturing where a computer directs the movement of material-removing tools to create the desired end shape, size, and finish.
Typical CNC machining includes:
- Milling
- Turning
- Drilling
- Grinding
The major benefit of CNC machining is its capability of allowing the production of complex parts to close tolerances and repeatable accuracy.
Key Advantages of CNC Machining
CNC machining comes with a number of benefits over other production methods:
- High Precision. Many modern CNC machines can operate with tolerances within microns, allowing use in mission-critical applications.
- Repeatability. Once a program is optimized, precisely that same part can be produced thousands of times with little variation.
- Range of Materials Processed. Metals processed include aluminum, stainless steel, titanium, and brass of various grades, and some plastics.
- Complex Geometry Possible. Multi-axis machines can produce complicated shapes that may be hard or impossible to create manually.
In use cases, let’s take a look at an example of precision CNC-machined components used in the real world to see how much these advantages come into play.
Applications of CNC Machining
CNC machining services are beneficial in a wide range of industries. These include:
- Automotive Industry. CNC machining is widely used in the automotive industry for the making of engine parts, transmission pieces, and structural elements.
- Aerospace Industry. CNC machining is vital in aerospace for the making of turbine blades, housings, and tight-tolerance assemblies.
- Medical Industry. CNC machining is used for surgical instruments, implants, and other equipment.
- Electronics Industry. Further along in the process, CNC machining is used to make connectors and other small electronic components and precision parts.
The Role of CNC Machining in Modern Manufacturing Systems
In the old days, CNC machining was seen as a standalone process. Today it’s part of a larger, integrated manufacturing system.
Modern production operations combine:
- CNC machining
- Automated material handling
- Inspection and quality control systems
- Digital data monitoring
The result is more efficient production with a reduced chance of errors.
For instance, many companies now use “lights-out manufacturing,” where machines run unattended to boost productivity and, more importantly, maintain product quality.
Engineering Challenges in CNC Machining
Even with its many advantages, CNC machining has a number of engineering problems that require management. These include:
- Tool wear. Cutting tools inevitably wear out, and tool wear can be one of the causes of part accuracy problems and degraded surface finish.
- Thermal effects. The heat generated by the machining process can cause such phenomena as changes in part dimensions due to vaporization or expansion of the material.
- Fixturing. Problems such as vibration arise when a part is poorly fixtured on its mounting.
- Programming complexity. Parts with advanced geometries require sufficiently sophisticated toolpath generation strategies; otherwise, it may not be possible to avoid collisions, or optimal machining efficiency may not be attained.
Emerging Trends in CNC Machining
CNC machining is changing at an equally rapid pace, under the influence of technology and the marketplace. Some CNC machining process trends you can expect to see include:
- Automation and robotics. Robotic systems for loading and unloading parts keep the production going around the clock.
- Digital twin technology. Machining digital models prior to production eliminates errors and makes processes more reliable
- Smart manufacturing. Connecting machines with “checks and balances” through sensors allows performance to be tracked and more data to be available on a real-time basis.
- Multi-axis machining. Getting up to a 5-axis or similar multi-axis machine gives more complex tool geometries and machine setups. These trends will be creating the “future of manufacturing” as we know it, making for ever more efficient, flexible, and reliable processes!
From Machining Suppliers to Engineering Partners
Another major change in the industry is how companies work with machining providers.
An increasing number of businesses, rather than just farm out the work, are looking for partners who can help with design optimization or process improvement.
Collaborating with an established team like that at Falcon CNC Swiss, which has solid roots in precision machining and production support, enables engineers to raise issues earlier in the design process.
This can help lower costs, increase manufacturability, and guarantee quality in the volume production run.
Conclusion
CNC machining is transforming. It’s not just about cutting material anymore; it’s about using computational power to design and manufacture parts in a new way.
With all of the new digital technology and automation coming to the floor, CNC machining is becoming smarter.
For engineers and manufacturers, it’s important to try to stay on top of all of this.