In the realm of manufacturing, the CNC machining process, denoted by computer numerical control
machining, is a subtractive method that integrates computerized controls and machine tools.
Its fundamental principle involves the removal of layers from a solid material block.
The programming specifies the desired cuts in the metal, coordinating with the corresponding tools
and machinery to execute the machining task in an automated manner.
Product Details
CNC machining encompasses a wide variety of materials, each requiring specific machining
parameters for optimal performance. The most common materials include:
1. Metal:
Metal is the predominant material in CNC machining, with the ability to cut various types, from
brass to nickel superalloys like Inconel. Applications range from injection molds to shafts and gears.
2. Plastic:
While injection molding is common for plastic parts, CNC machining is used for specific components
like ABS, nylon, and polycarbonate. Applications include valve bodies, bushings, and injection
molding prototypes.
3. Wood:
CNC routers are frequently employed for wood cutting, especially for decorative purposes like
furniture, window frames, and ornamental panels.
4. Foam:
Polyurethane foam, both closed and open-cell, finds application in CNC machining for creating
secure packaging, such as foam used in toolboxes for tool transportation.
5. Composites:
CNC machines are essential for processing abrasive composite materials like aramid, fiberglass,
and carbon fiber, commonly used in aerospace and marine components.
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 Finishing Options for CNC Machining | ||
Name | Applicable Materials | Can be Applied with |
Alodine | Aluminum | Media Blasting, Tumbling, Type II Anodizing* Type III Anodizing*, Type III Anodizing with PTFE* |
Anodizing | Aluminum | Media Blasting, Tumbling, Alodine* |
Black Oxide | Steel, Stainless Steel | Media Blasting, Tumbling, Passivation |
Electroless Nickel Plating | Aluminum, Steel, Stainless Steel | Media Blasting, Tumbling |
Electropolishing | Steel, Stainless Steel | — |
Hand Polishing | Acrylic | Enhanced cosmetic appearance |
Media Blasting | Aluminum, Steel, Stainless Steel, Brass, Bronze, Copper | All post processes except Electropolish and Powdercoat |
Nickel Plating | Aluminum, Steel, Stainless Steel | Media Blasting, Tumbling |
Passivation | Steel, Stainless Steel | Black Oxide, Electroless Nickel Plating, Zinc Plating, Tumbling, Media Blasting |
Powder Coating | Aluminum, Steel, Stainless Steel | — |
Tumbling | Aluminum, Steel, Stainless Steel, Brass, Bronze, Copper | All post processes except Electropolish and Powdercoat |
Vapor Polishing | CNC Polycarbonate (Clear, Black) | Enhanced cosmetic appearance, near optically clear applications |
Zinc Plating | Steel, Stainless Steel | Media Blasting, Tumbling, Passivation |
Applications of CNC Machining
CNC machining stands as a cornerstone in subtractive manufacturing, playing a pivotal role in
numerous industries. Some of the most prominent sectors leveraging CNC machining include:
1. Aerospace: Precision and reliability are non-negotiable in aerospace applications.
CNC machining is crucial for producing intricate and accurate components for aircraft and spacecraft,
meeting the demanding standards of the industry.
2. Automotive: The automotive sector relies heavily on CNC machining for the fabrication of precision
parts, contributing to the efficiency, performance, and safety of vehicles.
3. Aviation: Similar to aerospace, the aviation industry benefits from CNC machining's precision in
crafting components that adhere to strict quality and safety regulations for optimal aircraft performance.
4. Transportation: Beyond air and land, the transportation industry, encompassing rail and maritime
sectors, integrates CNC machining for the production of robust and precise components that endure
challenging operational conditions.
These industries showcase the versatility of CNC machining, where its capabilities are harnessed to
meet the stringent demands of manufacturing in sectors where precision, durability, and quality are
of utmost importance.
Company Profile
FAQ's
1. Do you offer other services, like finishing, assembly, packaging, and logistical support?
Our range of services extends seamlessly from finishing operations to logistical support, providing
a comprehensive solution for the swift and cost-effective production of your parts.
With capabilities covering anodizing, plating, grinding, finishing, assembly, warehousing, packaging,
and just-in-time delivery, we aim to deliver a hassle-free, one-stop production process.
This approach allows you to channel your efforts into your business priorities while enjoying time
and cost savings.
2. How do I request a quote?
Initiating a quote request with us is a straightforward and hassle-free process.
Visit our "Contact Us" page and fill out the brief web form. We'll prompt you for key details like
turnaround time, required quantity, and offer a space for a brief project description.
For added convenience, you can easily upload your drawing file. Should you favor communication
through email, fax, or phone, our contact page provides all the pertinent information.
3. How can I ensure my design is confidential?
We prioritize the confidentiality of your design, and to reinforce this commitment, we are willing
to enter into a Non-disclosure Agreement (NDA) with our customers.
This agreement can be established prior to the quoting phase or when placing an order, ensuring
a secure environment for your proprietary information.
4. How does compare to other suppliers on price?
Making direct comparisons may be complex, but as a rule of thumb, We's prices are usually 25-45%
more economical for plastic injection mold tools and CNC machined/turned parts in comparison to
suppliers in North America and Europe.