Aluminum Alloy Precision Electronic Accessory Shell
As an electronic accessory shell, it is suitable for USB flash drives, mobile hard drives, small device interface protective covers, etc. It uses the lightweight, beautiful and corrosion-resistant properties of aluminum alloy to improve product protection and visual quality.
classification：
CNC Machining Parts
Keywords:
Jiesen
Product Details
Principles of CNC Machining Technology:
CNC (Computer Numerical Control) machining technology is a technique that uses computer programs to control machine tools (such as milling machines, lathes, grinding machines, etc.) to perform high-precision cutting, milling, drilling, and boring operations on metal or non-metallic materials. Its core characteristics are high degree of automation, stable precision, and suitability for processing complex parts. It is widely used in high-end manufacturing fields such as aerospace, automotive manufacturing, mold development, medical devices, and 3C electronics.
Types and Characteristics of CNC Machining:
| Main CNC Machining Processes | Process Description | Applications | Features | ||||||||
| CNC Milling | Cutting the workpiece using a rotating tool; suitable for machining complex shapes. | Manufacturing molds, mechanical parts, aerospace components, etc. | High precision, suitable for complex geometric shapes. | ||||||||
| CNC Turning | Cutting is performed by rotating the workpiece and using a fixed cutting tool, suitable for machining cylindrical workpieces. | Used for manufacturing shafts, bearings, threaded parts, etc. | High efficiency, suitable for machining symmetrical shapes. | ||||||||
| CNC Drilling | Drilling holes in a workpiece using a rotating drill bit; suitable for hole machining. | Used in the manufacturing of mechanical parts, electronic components, etc. | High precision, suitable for mass production. | ||||||||
| CNC Grinding | Precision grinding of workpieces using a rotating grinding wheel, suitable for high-precision surface machining. | Used in the manufacturing of cutting tools, molds, precision parts, etc. | High precision, high surface quality. | ||||||||
| CNC Wire Cutting | Cuts workpieces using electrical discharge machining, suitable for processing complex shapes and hard materials. | Used for manufacturing molds, precision parts, etc. | Suitable for hard materials and complex shapes. | ||||||||
| CNC Laser Cutting | Cuts workpieces using a laser beam; suitable for processing thin sheets and complex shapes. | Used in the manufacturing of metal sheets, plastic parts, etc. | High precision, non-contact processing. | ||||||||
| CNC Plasma Cutting | Uses a plasma arc to cut workpieces; suitable for processing thick plates and conductive materials. | Used in the manufacturing of metal sheets, structural components, etc. | High efficiency, suitable for thick plates. | ||||||||
A wide variety of materials can be machined, primarily including the following categories:
| Material | Material Description | Machining Performance | Applications | ||||||||
| Alloy Steel | A type of steel that is based on carbon steel with the addition of one or more appropriate alloying elements to improve its properties, such as chromium steel, nickel steel, and molybdenum steel. | The addition of alloying elements improves the strength, toughness, and wear resistance of the steel, but the machinability of different alloy steels varies considerably. Generally, alloy steels with higher alloy element content and higher hardness are more difficult to machine. | Widely used in aerospace, automotive, and machinery manufacturing industries, such as aircraft engine blades and automobile half-shafts. | ||||||||
| Aluminum Alloy | An alloy based on aluminum with a certain amount of other alloying elements added; it is one of the light metal materials. | It has low density, high specific strength, good thermal and electrical conductivity, low cutting force during machining, slow tool wear, and good surface quality after processing. | Widely used in aerospace, automotive, electronics and other industries, such as aircraft wings, automobile engine blocks, and mobile phone casings. | ||||||||
| Copper Alloys | Alloys composed of pure copper as the base metal with the addition of one or more other elements, such as brass (copper-zinc alloy) and bronze (copper-tin alloy, etc.). | They possess good electrical and thermal conductivity and corrosion resistance, and have good machinability. However, the hardness of different copper alloys varies, affecting the difficulty of processing. | Commonly used in electrical equipment, ship parts, and decorative materials, such as wires and cables, ship propellers, and handicrafts. | ||||||||
| Polyamide (PA, commonly known as nylon) | A synthetic resin with excellent overall properties, including mechanical properties, heat resistance, and wear resistance. | It is easily hygroscopic, and moisture absorption affects its dimensional stability and processing performance. However, it has good machinability in a dry state and can be processed using various methods. | Widely used in automotive, electronics, and machinery industries, such as automotive engine components, electronic connectors, and mechanical gears. | ||||||||
| Polycarbonate (PC) | A colorless, transparent, heat-resistant, impact-resistant, and flame-retardant polymer. | It has high hardness and good toughness. Appropriate cutting tools and parameters must be selected during machining to prevent chipping and cracking. | Commonly used in the manufacture of optical lenses, automotive headlight covers, and electronic and electrical appliance housings. | ||||||||
| Glass Fiber Reinforced Plastic (FRP) | A composite material made of glass fibers and their products (glass cloth, tape, mat, yarn, etc.) as reinforcing materials, with synthetic resin as the matrix material. | It has high strength and rigidity, but is relatively brittle. Cutting can easily cause delamination and tearing, requiring the use of appropriate tools and processing techniques. | It is widely used in aerospace, automotive, marine, and construction fields, such as aircraft radomes, automotive body parts, and boat hulls. | ||||||||
CNC machining core process:
1. Process Preparation Phase
Part Analysis and Process Planning
Analyze part structure (e.g., presence of deep cavities, thin walls, undercuts), and material characteristics (hardness, machinability);
Determine machining sequence (e.g., rough machining followed by finish machining), clamping method (vise, chuck, special fixture), and tool path (to avoid interference).
CNC Programming
Manual programming: suitable for simple parts (e.g., straight lines, arcs);
Automatic programming: for complex parts, CAM software is used to generate tool paths and automatically optimize cutting parameters (feed rate, spindle speed, cutting depth).
Tool and Fixture Selection
Select tools based on machining features (e.g., end mill for flat surfaces, ball-end mill for curved surfaces);
Fixtures must ensure positioning accuracy (e.g., repeatability error ≤0.01mm) and clamping rigidity.
2. Machining Execution Phase
Tool Setting and Workpiece Clamping
Use a tool setter to determine the relative position of the tool and workpiece, and set the workpiece coordinate system (G54-G59).
Rough Machining
Rapidly remove most of the blank material, using a large feed rate and cutting depth, leaving 0.5-2mm for finish machining.
Semi-finish Machining and Finish Machining
Semi-finish machining corrects rough machining errors, and finish machining ensures dimensional accuracy (IT6-IT7 grade) and surface roughness (Ra0.8-3.2μm).
Tool Change and Multi-process Machining
Complex parts require automatic tool changing (ATC system) to complete integrated multi-process operations such as milling, drilling, and tapping.
3. Inspection and Post-processing
Online inspection: Real-time measurement of dimensions using a machine tool's built-in probe to correct machining deviations;
Offline inspection: Coordinate measuring machine (CMM) inspection of geometric tolerances (e.g., flatness, perpendicularity);
Post-processing: Deburring, surface polishing, heat treatment (e.g., quenching to increase hardness).
CNC machining plays a significant role in modern industrial and technological development, primarily in the following aspects:
1. Increased Production Efficiency
Automation: CNC machining, controlled by computers, reduces manual intervention and significantly improves production efficiency.
Continuous Operation: Capable of 24/7 operation, suitable for large-scale production.
2. Improved Machining Accuracy
High Precision: CNC machine tools can achieve micron-level or even nanometer-level machining accuracy, meeting the needs of high-precision parts.
Consistency: In mass production, the size and shape of each part are highly consistent, reducing human error.
3. Machining of Complex Parts
Complex Geometric Shapes: Capable of machining complex geometric shapes and surfaces that are difficult to achieve with traditional methods.
Multi-axis Machining: Multi-axis CNC machine tools can perform machining in multiple directions simultaneously, improving the machining capabilities of complex parts.
4. Flexibility and Adaptability
Rapid Changeover: By changing programs and tools, CNC machine tools can quickly adapt to the processing needs of different products.
Small Batch Production: Suitable for small-batch, multi-variety production models, meeting personalized customization needs.
5. Reduced Costs
Reduced Waste: High-precision machining reduces material waste, lowering costs.
Reduced Labor: Automated production reduces reliance on skilled workers, lowering labor costs.
6. Driving Technological Innovation
New Material Processing: Capable of processing high-strength, high-hardness new materials, promoting the development of new material technologies.
Advanced Manufacturing Technology: Combined with advanced manufacturing technologies such as 3D printing and laser processing, it promotes the innovative development of the manufacturing industry.
7. Improved Product Quality
Stability: The CNC machining process is stable, reducing the impact of human factors on product quality.
Traceability: Processing data can be recorded and traced, facilitating quality control and problem analysis.
8. Promoting Industry 4.0 and Intelligent Manufacturing
Data Integration: CNC machining equipment can be integrated with other intelligent manufacturing systems to achieve data sharing and collaborative work.
Intelligent Monitoring: Through sensors and IoT technology, the machining process is monitored in real time, improving the intelligence level of production management.
9. Environmentally Friendly
Energy Saving and Emission Reduction: CNC machining equipment usually has a higher energy efficiency ratio, reducing energy consumption and emissions.
Green Manufacturing: By optimizing processing techniques and reducing waste, it promotes the development of green manufacturing. CNC machining has not only improved production efficiency and product quality, but also promoted the development of new materials, new processes, and intelligent manufacturing technologies, having a profound impact on modern industry and technological development.
Development trends of Jiesen CNC machining
1. High Speed and High Precision
Spindle speeds are increased to 20,000-40,000 r/min, and rapid traverse speeds reach 60-120 m/min. Combined with thermal error compensation technology, this enables micron-level machining (such as optical lens molds).
2. Five-Axis Linkage and Composite Machining
Five-axis machine tools (3 axes + 2 rotary axes) allow for five-sided machining in a single setup, while composite machine tools integrate multiple functions such as turning, milling, grinding, and laser processing, reducing workpiece handling errors.
3. Intelligence and Digitalization
AI-assisted programming: Machine learning optimizes tool paths and cutting parameters, reducing programming time;
Industrial Internet of Things (IIoT): Real-time monitoring of machine tool status (e.g., tool wear, spindle temperature), and predictive maintenance reduces downtime.
4. Green Machining Technology
Dry cutting (no cutting fluid) and minimum quantity lubrication (MQL) reduce pollution, and chip recycling systems improve material utilization.
5. Integration with Additive Manufacturing
Subtractive + additive hybrid processes (e.g., metal 3D printing + CNC precision machining) enable "rapid prototyping + precision correction" of complex structures. Typical example: complex aerospace components.
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