In the field of CNC Machining, the selection of metal materials directly determines machining efficiency, product precision, functional performance, and manufacturing costs; it serves as the fundamental prerequisite for achieving precision machining and ensuring product reliability. Different metal materials exhibit significant variations in their mechanical properties and machining characteristics, necessitating correspondingly distinct machining processes, tool selections, and application scenarios.
| Material | Features | Application |
|---|---|---|
| Aluminum Alloy | It features low density (2.7 g/cm³), excellent specific strength, ease of machining, and strong surface treatability. Common grades include 6061, 6063, 5052, and 7075; it combines good plasticity with toughness, and certain grades are capable of age hardening. | Electronic device enclosures, structural components for automation equipment, heat sinks, fixtures and jigs, and automotive parts—suitable for the electronics, automation, medical device, and general machinery industries. |
| Copper | It possesses high purity (commonly used grades: T1, T2), excellent electrical and thermal conductivity, and good plasticity, but relatively low strength. | Electrodes, conductive terminals, heat dissipation components, and electromagnetic shielding covers—suitable for the electronics, electrical engineering, mold manufacturing, and new energy industries. |
| Brass | Copper-zinc alloys—commonly used grades include H59, H62, and H65—exhibit excellent machinability, lower cost than pure copper, good plasticity, and moderate corrosion resistance. | Valves, fittings, nuts, bushings, and decorative components—suitable for the plumbing, hydraulic, pneumatic, and hardware industries. |
| Bronze | Alloys of copper with elements such as tin and aluminum—commonly tin bronze and aluminum bronze—exhibit high wear resistance, low friction, and corrosion resistance, and possess a strength superior to that of pure copper and brass. | Bearings, worm gears, gears, pump bodies, and seals—suitable for applications in construction machinery, marine equipment, molds, and heavy-duty transmission industries. |
| Steel | An iron-carbon alloy characterized by high strength, excellent rigidity, and susceptibility to heat treatment for strengthening. Commonly used grades include #45 steel, S50C (carbon steel), P20, 718, and NAK80 (mold steel). It has a density of approximately 7.85 g/cm³ and offers high cost-effectiveness; certain grades can be polished to a mirror-like finish. | Carbon steel is utilized for shafts, gears, structural components, and fixtures; mold steel is employed for mold cavities, mold bases, and precision fixtures. These materials are well-suited for use in the mold manufacturing, automation, machine tool, and general machinery industries. |
| Stainless Steel | Contains chromium and nickel elements; offers rust resistance, corrosion resistance, hygiene, environmental friendliness, and high strength. Common grades include 303, 304, 316, 416, and 420; some grades are free-machining. Grade 316 exhibits superior corrosion resistance compared to 304, while Grade 420 can be hardened through quenching. | Components for medical and food-processing equipment, fluid valve bodies, flanges, outdoor structural components, and precision shafts. Suitable for use in the medical, food, chemical, marine, and semiconductor industries. |
| Magnesium Alloy | The lightest structural metal commonly used in industry (density of approximately 1.8 g/cm³); characterized by high specific strength and excellent vibration-damping properties. Common grades include AZ31B, AZ61, and AZ91D. It exhibits good ductility but possesses relatively poor corrosion resistance and is flammable. | Aerospace components, drone parts, handheld device enclosures, and automotive lightweighting components; suitable for use in the aerospace, consumer electronics, automotive, and robotics industries. |
| Titanium Alloy | A high-performance alloy with a density of approximately 4.5 g/cm³. It exhibits high strength, corrosion resistance, high-temperature resistance, and excellent biocompatibility. The commonly used grade is TC4. While offering top-tier comprehensive performance, it is characterized by high material costs and significant processing difficulty. | Aerospace components, medical implants, precision parts for high-end equipment, and military components; suitable for use in the aerospace, medical, high-end manufacturing, and defense industries. |
Yumei specializes in the custom manufacturing of high-quality hardware components, offering a comprehensive range of services including CNC turning, milling, turn-milling, Swiss-style turning, automatic lathe machining, cold forging, and sheet metal fabrication. Backed by a technical team with 20 years of industry experience, we provide complimentary technical support and accept orders ranging from single prototypes to large-scale production runs—always prioritizing our customers and ensuring rapid response times.
Triple Certification, Guaranteed Quality
Certified by ISO 9001:2015, ISO 14001:2015, and IATF 16949:2016, ensuring standardized management throughout the entire process and laying a solid foundation for quality.
Measurable Materials, Traceable Performance
Material reports are provided, supporting testing of material composition, tensile strength, etc. Raw materials are traceable, and performance is verifiable, meeting high-end and export requirements.
Strict Quality Control, High Precision Standards
Strict quality control throughout the entire process, including comprehensive appearance inspection; dimensional and mechanical inspections follow GB/T 2828.1-2012 standards, ensuring 100% compliance, stable precision, and low rework rate.
Sufficient Equipment, Guaranteed Delivery Time
Equipped with over 150 CNC machining machines, large-scale production capacity is efficiently scheduled, ensuring timely delivery for both urgent and large orders, guaranteeing project progress.
A: The primary metal materials commonly used in CNC machining include aluminum alloys, stainless steel, carbon steel, copper and copper alloys, and titanium alloys. Among these, aluminum alloys—primarily grades 6061, 6063, and 7075—are easy to machine and offer lightweight properties. Stainless steel—commonly grades 303, 304, and 316—exhibits outstanding corrosion resistance. Carbon steel offers lower costs and reliable structural strength. Copper materials possess excellent electrical and thermal conductivity, making them suitable for electrical components requiring heat dissipation. Finally, titanium alloys feature high strength combined with low weight, and are frequently utilized in high-end, precision-critical applications.
A: Material selection primarily depends on the product's intended application, mechanical stress requirements, operating environment, aesthetic considerations, and cost constraints. For applications involving moderate stress where lightweight design and cost-effectiveness are priorities, aluminum alloys are the preferred choice. If resistance to rust, acids, alkalis, or high temperatures is required, 304 or 316 stainless steel should be selected. For cost-sensitive projects with modest structural strength requirements, carbon steel is a viable option. If electrical conductivity, thermal conductivity, and ease of machinability are essential, brass is the appropriate choice. Finally, for aerospace applications or situations demanding both high strength and lightweight properties, titanium alloys are the material of choice.
A: Standard CNC metal machining precision can be controlled within ±0.05 mm; for precision parts, through the application of finishing operations, fixture positioning, and measurement compensation, a tolerance of ±0.01 to ±0.02 mm can be achieved. Actual precision is influenced by factors such as part geometry, material properties, dimensions, machine tool condition, and machining processes; consequently, the precision of complex thin-walled parts or parts with long cantilevered sections may exhibit slight variations.
A: Common surface treatments for CNC metal parts include anodizing, sandblasting and anodizing, brushing, polishing, electroplating, blackening, phosphating, and painting. Anodizing is most frequently applied to aluminum alloys to enhance both aesthetics and wear resistance; stainless steel parts can undergo pickling, passivation, or electroplating; carbon steel is typically treated with blackening or zinc plating for rust prevention; and copper parts may be nickel-plated or gold-plated to improve conductivity and corrosion resistance. The specific treatment chosen depends on the intended operating environment and aesthetic requirements.
A: Materials such as stainless steel, titanium alloys, and high-temperature alloys are classified as difficult-to-machine materials. These materials possess high hardness, high viscosity, and poor thermal conductivity; consequently, during machining, they are prone to causing tool adhesion, vibration, and excessive tool wear. This not only results in low machining efficiency but also frequently leads to dimensional deviations and surface finish defects (tool marks). Therefore, machining parameters, tool selection, and cooling methods must be specifically optimized for these materials, which also results in relatively higher production costs.
A: Metal parts may undergo deformation during CNC machining—particularly thin sheets, large flat panels, long cantilevered sections, and thin-walled structures. Internal material stresses, cutting heat, clamping forces, and cutting forces can all contribute to such deformation. However, the extent of deformation can be effectively minimized—thereby ensuring dimensional stability—through measures such as leaving adequate machining allowances, employing multi-stage machining processes, performing stress-relief treatments, optimizing fixtures and tooling, and carefully controlling cutting parameters.
A: The stricter the drawing tolerances, the higher the demands placed on machine tools, cutting tools, fixtures, and inspection equipment; consequently, machining difficulty and scrap rates rise significantly, directly leading to a exponential increase in costs and extended lead times. Furthermore, metal materials inherently undergo thermal expansion and contraction, as well as minute deformations, making it difficult to consistently guarantee overly strict tolerances in actual production. Generally, it is recommended to adopt reasonable tolerances that are sufficient to fulfill the intended functional requirements.
A: CNC machining costs are primarily determined by factors such as material type and price, part size and weight, structural complexity, dimensional tolerances, surface finish requirements, machining time, and production volume. The greater the structural complexity, the tighter the tolerances, and the more demanding the surface finish requirements, the higher the cost. Unit prices also differ significantly between small-batch prototyping and large-scale mass production, and surface treatments incur additional charges. Whether you require a single part or a batch of over 100, we are fully equipped to meet your specific needs.
A: Yes, machining can be performed even without 3D drawings. You may provide a physical sample, which our specialists will digitize, measure, and draft into technical drawings before proceeding with machining. Alternatively, you may provide hand-drawn sketches, key dimensions, structural specifications, and requirements for materials and surface finishes; our engineers will then convert these inputs into standard 2D engineering drawings or 3D models to arrange production, ensuring that all dimensions and requirements are accurate and precise.
A: Quality assurance is primarily achieved by focusing on machine tool precision, process planning, process control, and inspection procedures. We utilize high-precision CNC machine tools and employ a process that separates rough machining from finish machining. Furthermore, we carefully select cutting tools and parameters, and utilize stable fixtures and tooling. Following machining, dimensional inspections are conducted using equipment such as calipers, micrometers, height gauges, 2D vision measuring systems, and CMMs. Inspection reports can be provided upon request to ensure that all parts fully comply with the specifications outlined in the technical drawings.
