CNC milling is one of the most common machining methods in the machining industry. This article has conducted a comprehensive analysis of the process. I believe that after reading it, you will definitely gain a lot and better understand what CNC milling is.
What is CNC Milling?
First of all, everyone will ask, what is milling? In fact, CNC milling is a kind of machining technology that uses computer-controlled. It controls the movement of the milling machine through pre-written programs and can process various materials with high precision, including metal, plastic and wood. The main characteristics of CNC milling are high degree of automation, high machining accuracy and good repeatability, so this process is very suitable for the manufacturing of complex shapes.
Types of CNC Milling
There are many types of CNC milling, and not all milling methods are suitable for you. By reading my next introduction, I believe you will know which one to choose.
1. Vertical CNC Milling
The tool is perpendicular to the workbench and is suitable for processing small parts. Vertical CNC Milling often used to manufacture parts of precision-processed and complex shapes.
2. Horizontal CNC Milling
The tool is placed horizontally and is very suitable for processing large-sized workpieces. This milling process is usually reserved for high-efficiency heavy-duty processing.
3. Three-Axis CNC Milling
The tool moves on three axes (X, Y, Z). Three-axis milling can generally be used to manufacture and process most conventional parts, and it can be said that the most common milling method is.
4. Five-Axis CNC Milling
The tool can be moved on five different axes. Five-axis milling can process complex three-dimensional shapes, and this process is widely used in the manufacturing of high-precision parts in the aerospace, automobile and other industries.
5. High-Speed CNC Milling
The process uses high-speed tools and fast feed speeds to improve processing efficiency, which is very suitable for mass production and high-efficiency processing.
6. Electrical Discharge CNC Milling
This process uses the principle of EDM for milling, which is more suitable for processing hard materials. Therefore, it is also commonly used in mold manufacturing and precision parts processing.
7. Composite CNC Milling
Composite CNC milling refers to equipment that combines milling with other machining technologies (such as turning and grinding). Therefore, this processing method is also used on parts with comprehensive processing requirements.
8. Multi-Axis CNC Milling
Since there are five-axis CNC milling, are there any more axes? Of course, it is multi-axis CNC milling. This process has CNC milling machines with more than five axes,allowing for more complex machining and is commonly used on parts that require extreme precision and complex shapes.
What Are The Steps In CNC Milling?
After talking about the types of CNC milling, you must be curious about the entire workflow of milling, and I will explain it in detail to you.
1. Design And Conversion
First, you need to use CAD software to create a 3D model of the parts to ensure that all sizes, shapes and tolerances are accurate. During this period, the CAD model must be imported into the CAM software to define the processing technology, including the required tools, cutting paths and processing parameters.
2. Generation And Loading Of G-codes
The CAM software converts the machining plan into G-code, which is the instruction set that controls the CNC machine tool, including motion, speed and tool replacement information. After that, the generated G code must be transferred to the CNC machine tool, usually via USB or network connection.
3. Setting And Simulation
In this step, you need to fix the workpiece on the machine table, pay attention to the correct position, and install the appropriate milling cutter. At the same time, simulation operations must be carried out in the software to systematically check various potential problems that occur during the processing process, such as tool collisions or path errors.
4. Performing Milling
Now you can start the CNC machine and follow the G code to cut. During this period, you should also pay attention to monitoring the machine tool status to ensure the smooth cutting process. Once any abnormal situation occurs, you can also deal with it in time.
5. Post-Processing And Inspection
Once the milling machining is complete, you can remove the workpiece and perform the necessary finishes, such as deburring, sanding, or polishing, to improve the surface quality. At the same time, quality inspection is required. You need to use measurement tools ( such as calipers and micrometers ) to check the dimensions and tolerances of the finished product to ensure that it meets the design requirements.
6. Document Recording And Feedback
Personal suggestion, this step cannot be ignored. You need to record the entire machining process, including the problems encountered during the process and the corresponding solutions, so that you can provide feedback and improve the machining process in the future.
Applications of CNC Milling
Next, let’s discuss what industries are there? I guess these also include your industry.
1. Manufacturing
The manufacturing industry is the most commonly used sector for CNC milling. This machining technology is often used to produce various mechanical parts, such as gears, shafts, brackets, etc., featuring high precision and consistency. At the same time, it can also be used to make injection molds, stamping molds, etc., meeting the demands for complex shapes and high precision.
2. Aerospace
The aerospace industry’s component products have high precision requirements, and CNC milling just meet this need. It can manufacture structural parts and components of aircraft, such as wings, fuselage, and engine components, ensuring strength and lightweight. It can even be used to manufacture precision parts for spacecraft, which require extremely high reliability and precision.
3. Automobile Industry
In the automotive industry, CNC milling is often used for machining key engine components, such as cylinder heads, shaft supports and pistons. It can also manufacture the frames and shells of automobiles, placing great emphasis on their safety and durability.
4. Electronics Industry
CNC milling can be used to manufacture printed circuit boards (PCBs), ensuring the precise layout of circuits. Of course, enclosures and brackets for electronic devices can also be manufactured.
5. Medical Devices
As we all know, components in the medical industry also have high requirements for precision, and CNC milling also serves the medical industry. It can manufacture high-precision surgical instruments, such as knives and forceps, with both safety and effectiveness. The process is also used to manufacture medical implants, such as joint replacements, dental implants, etc., which require biocompatibility and durability.
Advantages Of CNC Milling
Since so much has been said, you must be very interested in what advantages CNC milling has, and I’m here to answer that for you.
1. High Precision
It is well known that the operational precision and accuracy of CNC milling are extremely high, which is also why it can meet the production demands of industries such as aerospace and healthcare. After all, these fields have very strict requirements for the details and tolerances of parts. During this process, program-controlled machine tools eliminate potential human errors and autonomously machining various high-precision part products.
2. Consistency
It is precisely because the program is self-controlled that the product can maintain consistency according to the parameter settings. And once the main design file is created, an unlimited number of copies can be made based on it, and the quality of these copies is completely the same.
3. Automation And Efficiency
Automation can be said to be one of the most typical features of CNC milling. During this process, the machine tool can automatically perform processing tasks, and the movement speed of the cutting tool is not limited by humans, which greatly improves production efficiency and allows for more work to be completed in a short amount of time.
4. Flexibility
CNC milling can machining various materials, including metals, plastics, and wood, to meet different production needs. During the process, you only need to quickly switch to different products or parts by changing the program.
5.Machining Capabilities For Complex Shapes
Many parts actually have quite complex shapes, making them very difficult to machining, but CNC milling can complete the processing well, including products with various curves and angles.
6. Reduced Material Waste
Since CNC milling is precisely controlled by programs, it minimizes material waste. By optimizing material utilization, the overall production cost can be reduced.
7. Safety
Safety is certainly something you care about, but don’t worry, the safety of CNC milling is quite reliable. The automation of the machine reduces the risk of workers directly contacting cutting tools and high-speed rotating parts, enhancing operational safety.
8. Reduced Labor
The automation level of CNC milling machines is high, and most operations are completed autonomously by the machines, so the number of monitoring and operating personnel required is reduced, which increases efficiency and reduces labor costs.
CNC Milling Machines
Lastly, let’s talk about the CNC milling machines you might be interested in. After all, the use of CNC milling machines is indispensable throughout the entire milling process.
1. CNC Milling Machine Components
（1）Machine Tool Body
- Base: The basic part of the machine tool that provides stability and support, usually made of cast iron or steel.
- Column: Supports the vertical structure of the machine tool, connecting the base and other components.
（2）Workbench
- Workbench: It is used to fix the surface of the workpiece, usually equipped with a T-slot, which facilitates the installation of clamps or fixture systems.
- Movement mechanism: The workbench can be moved in the X, Y, and Z directions, and can process in different positions on the workpiece.
（3）Spindle
- Spiral shaft: Drive the milling cutter equipped with a high-speed motor to rotate. The accuracy and rigidity of the spindle directly affect the machining
- Tool clamping system: You need to pay attention to fixing the milling cutter device to ensure that the tool is stable during the machining
（4）Feed system
- Servo motor: It will control the movement of the workbench and spindle to ensure accurate feed speed and position.
- Ball screw: This component is a mechanical component that transmits movement, which can ensure high accuracy and low friction.
（5）Control System
- CNC controller: The computer is responsible for receiving and interpreting G codes, controlling the movement and processing of the machine tool.
- User interface: The interface for the operator to interact with the machine tool, usually including a display screen and control buttons.
（6）Cooling System
- Coolant pump: transports the coolant to the processing area to prevent the tool from overheating, thereby extending the tool life.
- Nozzle: Coolant needs to be sprayed onto the processing surface to reduce friction and heat.
（7）Safety Device
- Emergency Stop Button: In case of emergency, you can stop the machine by pressing the emergency stop button to ensure production safety.
- Protective cover: This is to protect the operator from being damaged by chips and splashing liquid.
（8）Tool
- Milling cutter: It is a tool used for cutting, there are many types (such as flat mills, end mills, etc.), and you can choose the most suitable one according to your machining needs.
（9）Sensor And Feedback System
- Position sensor: This instrument is used to monitor the position of various parts of the machine tool, so as to ensure accurate motion control.
- Temperature sensor: This tool mainly monitors the temperature of the spindle and motor to prevent overheating during the machining process.
Conclusion
Throughout this article, it can be said that CNC milling is one of the best machining methods in machining. It can efficiently produce high-precision parts for you, and it can also meet your requirements for making parts with different complex shapes. Correspondingly, DSR company with 14 years of experience has such machining capabilities, and we look forward to your cooperation with us if you have any service needs!
FAQ
Q1: Is CNC milling expensive?
A: The cost of CNC milling is affected by several factors, including material type, processing complexity, production batches, equipment specifications, and programming and setup requirements. Often, better materials and more complex operational difficulties will increase costs, while mass production will reduce the cost per piece. In short, when you choose a service, you can get multiple quotes to compare.
Q2: What materials does CNC milling use?
A: CNC milling is capable of machining a wide range of materials, including metals, plastics, composites and wood. Common metals include aluminum, steel, stainless steel and copper, while plastics include polyformaldehyde, polycarbonate and polyethylene. The composite materials are mainly carbon fiber and glass fiber composite materials.
Q3: How to Choose CNC Milling Services?
A: If you want to choose a suitable milling service, please note the following points.
First of all, consider the supplier’s experience and professionalism and understand whether his technical level can meet your requirements.
Second, determine whether the supplier has advanced CNC equipment to meet machining needs, including precision and material handling capabilities.
Third, you need to pay attention to obtaining multiple quotes to compare.
Fourth, the delivery time of the goods is also a key factor
Fifth, understand the supplier’s quality inspection process to ensure that the final product can meets the standards.
