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Types

Aluminum Polishing Techniques in CNC Processing
While all methods aim to achieve smooth, high-quality surfaces, distinct CNC polishing techniques yield different aluminum finishes:

Mechanical Polishing
Method: High-speed rotation of abrasive pads, belts, or wheels against aluminum surfaces.
Applications: Most common method for smooth/shiny finishes in decorative pieces and low-friction functional parts.

Electrolytic Polishing (Electropolishing)
Method: Immersion in an electrolytic solution under electric current.
Outcome: Removes surface irregularities for smooth/bright finishes.
Applications: Critical for medical devices requiring hygienic, ultra-smooth surfaces.

Vibratory Polishing
Method: Vibration-induced movement with abrasive media in containers.
Outcome: Constant rubbing action polishes surfaces uniformly.
Applications: Ideal for small parts and mass production with rapid processing.

Buffing
Method: Final-stage polishing using polishing compound-impregnated soft cotton wheels.
Outcome: Delivers high-gloss finishes.
Applications: Aesthetically critical components (aluminum trim, automotive parts, kitchen appliances).

Challenges

CNC (Computer Numerical Control) machining is a computer-guided manufacturing process where programmed instructions direct machine tools to remove material from workpieces, creating precise parts. These versatile machines perform operations like milling, drilling, and turning with exceptional precision.

Digital programming enables fine control over cutting toolpaths, particularly beneficial for materials like stainless steel requiring exact cutting, shaping, and finishing to achieve desired properties.

Machine capabilities vary significantly: precision levels and complex geometry handling depend on operational axes. 5-axis CNC machining surpasses traditional 3-axis systems by delivering greater flexibility, precision, and efficiency for high-precision part production.

Technical Parameters

Advantage

Advantages of Our CNC Turning & Milling Services:

Dedicated Support Teams: Professional pre-sales and after-sales support

Expanded Production Facility: 3,000-square-meter manufacturing facility primarily dedicated to CNC machining

Quality Assurance: ISO-certified with third-party verification support

Technical Expertise: Engineering support services provided

Principle

Aluminum Polishing Methods
Different post-CNC polishing techniques achieve specific results:

Mechanical Polishing
Uses abrasive tools (wheels, belts, pads) to physically smooth surfaces. Effective for:

Removing machining marks

Creating uniform grain/mirror finishes

Preparing surfaces for anodizing/coating

Chemical Polishing
Applies chemical solutions to etch and smooth surfaces. Suitable for:

Intricate/delicate parts are incompatible with mechanical polishing

Achieving uniform finishes on complex geometries

Electropolishing
Electrochemical process removing microscopic surface layers. Benefits:

Superior smoothness and cleanliness

Enhanced corrosion resistance

Ideal for medical, aerospace, and cleanroom applications

Vibratory/Tumbling Polishing
Vibrates/rotates parts with abrasive media. Best for:

Batch processing small components

Edge deburring and smoothing

Creating satin/matte finishes

FAQ

• Q: How does Crida ensure the quality of my parts?
• A: Once your order is confirmed, we will perform a full Design for Manufacturing (DFM) review to point out any issues that our engineers feel may affect the quality of your parts. Each batch of goods must have first article assurance(FAA), and then IPQC inspections for many times, Final inspection reports before shipment

• Q: How to get a quote?
• A: Detailed drawings (PDF/STEP/IGS/DWG...), including quality, delivery date, materials, quality, quantity, surface treatment and other information.

• Q: What tolerances can Crida achieve?
• A: There is no given set of tolerances that fits all processes and materials. In every case, the final tolerances on your part will depend on a number of factors, including but not limited to: Part size Design Geometry The number, type, and size of features Material(s) Surface finish Manufacturing Process Once your order is confirmed, we will review your design and provide a design for manufacturing review, pointing out any areas where we may not be able to achieve your desired tolerances. It’s helpful if you can specify which areas in your design have critical tolerances that must be met and which can be slightly modified if needed to reduce the time and costs involved.

• Q: What’s your MOQ?
• A: We have no MOQ for our new customers; we are accepting small orders to support your trial order, new design, and marketing development.

• Q: Can you provide samples before mass production?
• A: Of course, the sample fee is necessary. If possible, it will be returned during mass production.

Shenzhen Crida Model Co., Ltd. is a leading provider specializing in rapid prototyping and rapid tooling manufacturing technology. We offer comprehensive one-stop solutions – encompassing production, sales, and service – to streamline your product development journey from concept to low-volume manufacturing.

Core Capabilities & Services:

Advanced Prototyping:

CNC Machining Prototypes (Metal & Plastic): Utilizing 3-axis, 4-axis, 5-axis milling, 3-axis turning, and turn-mill compound machining.

Sheet Metal Prototypes

Silicone Molding & Vacuum Casting Prototypes

3D Printing Prototypes (SLA & SLS)

Low-Volume Production: Efficiently scaling prototypes into functional end-use parts.

Rapid Tooling: Accelerating mold production for faster part iteration.

Complementary Processes: Laser cutting and sheet metal bending for integrated fabrication.

Engineering Excellence & Quality Commitment:

Crida boasts a team of experts with decades of industry experience, dedicated to exceeding your expectations. Backed by over 100 sets of advanced manufacturing equipment and thousands of precision measurement instruments, we guarantee exceptional quality and on-time delivery. Our capabilities include:

Multi-Axis CNC Machining Centers (3/4/5-axis milling, 3-axis turning, turn-mill compound)

Industrial 3D Printers (SLA & SLS)

Vacuum Casting Machines

Laser Cutting Systems

Sheet Metal Bending Equipment

This robust infrastructure enables us to manufacture high-precision components with tolerances as tight as ±0.01 mm (standard) and ±0.002 mm in critical areas. All outputs adhere to stringent quality standards.

Core Values & Philosophy:

Crida's foundation rests on "Service," "Quality," and "Efficiency" as our vital principles, driven by a "Continuous Innovation" business philosophy. Leveraging cutting-edge equipment and a seasoned workforce, we significantly reduce your product development cycle time, cost, and risk, making your projects easier, faster, and more successful. We take pride in our robust management system and exceptional customer retention rate.

Mission:

We pursue innovations critical to our customers and their businesses, facilitating their rapid and efficient realization.

Industries Served & Global Reach:

Crida excels in manufacturing high-end precision components for demanding sectors, including:

Aerospace

Military/Defense

Robotics

New Energy (including EV Components)

Medical Devices

Automotive

Our high-quality products serve clients worldwide, with exports reaching Spain, Malaysia, Thailand, Israel, France, Germany, the UK, Italy, Sudan, the USA, and Canada.

As a leading on-demand manufacturing partner in China, Shenzhen Crida Model Co., Ltd. empowers you to transform innovative concepts into premium-quality products with unmatched speed and reliability.