Dongguan Yexin Intelligent Technology Co., Ltd.
Precision in Every Part, Excellence in Every Detail
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CNC Machining Precision Medical CNC Turning Aluminum Parts Anodized
White Aluminium Spare Parts Providers
CNC, short for computer numerical control, defines a machining process driven by computer
commands.
This technology enables faster, more accurate, and intricate part production compared to manual
methods.
CNC machining reduces reliance on manual labor while enhancing precision and complexity.
Although humans are vital for programming and machine operation, the physical machining tasks
are automated.
This synergy between human expertise and computer-driven automation ensures seamless and
efficient operations.
Product Details
Materials Used in CNC Machining
CNC machining is a versatile process employed across a wide range of materials, each with its
own ideal machining parameters, including speeds and feeds.
Here are some of the most common materials used:
1. Metals
Metals are the most frequently machined materials, ranging from easily workable brass to robust
nickel superalloys like Inconel.
CNC machining in metal finds application in various industries, including the production of injection
molds, shafts, and gears.
2. Plastics
While injection molding is the primary method for plastic part production, CNC machining is utilized
for specific plastic components.
Common plastic materials include ABS (acrylonitrile butadiene styrene), nylon, and polycarbonate.
Plastic CNC machining is suitable for valve bodies, bushings, and prototypes to assess part
functionality before investing in costly molds.
3. Wood
CNC routers are commonly employed for wood cutting, offering a cost-effective alternative to
metal-cutting CNC machines. Wood CNC machining is often used for decorative purposes, such as
crafting furniture, window frames, and ornamental panels.
4. Foam
Polyurethane foam, both closed-cell and open-cell varieties, is frequently used in CNC machining
applications. CNC routers can shape foam blocks to create custom packaging for high-value items,
such as toolboxes designed to securely transport tools.
5. Composites
CNC machines play a crucial role in processing composite materials like aramid, fiberglass, and
carbon fiber. These abrasive materials require precise machining to add fastener holes and trim
components in industries like aerospace and marine manufacturing.
| Common Materials for CNC Machining | |
| Material | Properties |
| Aluminum | 2024: Good fatigue resistance and strength; excellent toughness at moderate to high strength levels; improved fracture toughness |
| 6061: Excellent machinability, low cost, and versatility | |
| 7075: High strength, hardness, low weight, and heat tolerance | |
| Brass | Versatile and highly attractive copper/zinc alloy with warm yellow color accommodates severe forming/drawing |
| Copper | High ductility and high electrical and thermal conductivity; develops attractive blue-green surface patina over time |
| Stainless Steel | Excellent machinability and outstanding uniformity; good workability and weldability, high ductility and formability |
| Steel Alloy | Mix of chromium, molybdenum, and manganese yields toughness, good torsional and fatigue strength |
| Steel Mild Low Carbon | High machinability and weldability, high stiffness; good mechanical properties, machinability, and weldability at low cost |
| Titanium | Excellent strength to weight ratio, used in aerospace, automotive, and medical industries |
| ABS | Excellent impact resistance, good mechanical properties, susceptible to solvents |
| Nylon | Excellent mechanical properties, high toughness, poor moisture resistance |
| POM | High stiffness, excellent thermal & electrical properties, relatively brittle |
Post-processing and surface finishes for CNC machining
CNC-machined parts as they emerge from the machine often exhibit visible tool marks, a feature
that may not align with your specific part requirements.
Fortunately, there exists a multitude of post-processing techniques aimed at enhancing the surface
appearance and elevating attributes such as wear resistance, corrosion resistance, and chemical
resistance.
Methods like anodizing, bead blasting, and powder coating present viable options for refining the
final presentation of your custom parts, allowing you to achieve the desired surface quality and
performance characteristics.
| Surface Finishes | ||
| Name | Applicable to | Machining marks |
| As machined | Metals, Plastics | Visible, light surface scratches |
| Smooth machining | ||
| Fine machining | Metals | Slightly visible |
| Polishing | Metals | Removed on primary surfaces |
| Bead blasting | Metals | Removed for non-cosmetic, removed on primary surfaces for cosmetic |
| Brushing | Metals | |
| Anodizing Type II | Aluminum | |
| Anodizing Type III | Aluminum | Visible under anodizing |
| Black oxide | Copper, Stainless steel, Alloy steel, Tool steel, Mild steel | Visible |
| Powder coating | Metals | Removed |
| Brushed + electropolishing | Stainless steel | Removed on Primary surfaces |
Specialist Industries
CNC machining stands as a prevalent subtractive manufacturing method, with a vast array of
industries relying heavily on its capabilities.
Prominent sectors that extensively employ CNC machining encompass aerospace, automotive,
aviation, transportation, and various critical domains.
For instance, the aerospace industry demands the utmost precision in crafting airplane
components to guarantee flawless functionality and adherence to design specifications.
Company Profile
FAQ's
1. What tolerances can be achieved?
Tolerances are not standardized across all processes and materials.
The final tolerances on your part depend on various factors, such as part size, design complexity,
the number and size of features, materials used, surface finish, and the manufacturing process
employed.
Once your order is confirmed, we conduct a Design for Manufacturing review to identify areas
that may need modification for better manufacturability.
It's helpful if you can specify which areas in your design have critical tolerances that must be
met and which can be adjusted, if necessary, to optimize production time and cost.
Here are some general tolerance guidelines:
General tolerances for CNC machining in metal and plastic.
Tolerances for plastic injection molding.
Reference charts for CNC machining of metals and plastic injection molding materials.
General tolerance for metal 3D printing is +/- 0.5mm.
A shrinkage rate of +/- 0.15% can be expected for vacuum casting.
All manufacturing and technical specifications must be clearly defined in the 2D drawings to be
followed accurately.
2. What is the typical delivery time and quotation process?
Delivery time is determined based on the complexity of the parts.
For low-complexity parts, the lead time is typically 2-3 days. As the complexity of the parts
increases, the lead time can range from 2-5 days.
High-complexity parts may require a lead time of 5-15 days.
Similarly, the quotation process varies depending on the complexity of your design.
Quotes can be provided in as little as 1 business day, or it may take 3 or more business days
for more intricate designs.
If you have a design that you would like our team to assess and provide a quote for, please
don't hesitate to contact us.
3. What if I am not fully satisfied with the received parts?
We stand by the quality of our materials and workmanship, adhering to the terms outlined in
the original order and the information provided by you.
If there are any disputes arising from subjective judgments, we encourage you to bring them
to our management's attention.
We are committed to working in good faith to ensure your complete satisfaction.
Our ongoing success is dependent on earning your trust in our ability to meet and even surpass
your reasonable expectations.