Finishing Services

From Machining to Post surface finishes

What Finishing services Shanghai Elue Offer?

Surface finishing is one more step after CNC machining, at Shanghai Elue, whether it’s a prototype or mass production order, we can help to perfect the parts by applying various treatments to improve the appearance, strength and resistance, adjust electrical conductivity, and much more.
Services Offered By our Qualified Vendors
pay2-icon1.png Plating
pay2-icon1.png Anodizing
pay2-icon1.png Powder coating
pay2-icon1.png Pad and Silk Screen Printing
pay2-icon1.png Sand blasting
pay2-icon1.png Polishing
pay2-icon1.png Heat treating
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Standard Finish

As soon as cnc manufacturing process is complete, it will produce a machined finish or you can say “standard finish”, and the part will have some visible machining marks and the surface roughness is around Ra1.6-3.2 μm. Their roughness and lack of protective coating renders them susceptible to nicking, scuffing, or scratching.

Machined finish

Machined finish

Machined finish

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Anodizing

Anodizing is an electrochemical process that allows the natural oxide layer to form a protective layer on the aluminium CNC machine parts, making it thicker, less conductive and more durable. During the anodizing processing, the parts will be immersed in an acidic electrolyte to act as an anode. Once the cathode is placed in an anodic oxidation tank, an electric current passes through the acid, and oxygen ions from the electrolyte and atoms from the alloy bond to the surface of the part.
There are two different types of anodizing: Type II and Type III. Type II is known as “decorative anodizing” while Type III is known as “hard anodizing”and is more wear resistant. depending on the desired application of the material,we can create different layer thickness.
In conclusion, Anodising brings decorative value where aluminium can take on various colours,also it creates a hard, wear-resistant layer that properly protects aluminium.

BEAD BLASTING

Beadblasting is widely used in cnc machine aluminium parts. This finishing technique is used to clean part’s surface and refine the overall appearance that creates a homogeneous surface with a rough or dull texture. Bead blasting is a type of shot blasting that involves shooting high-pressure materials (glass or steel) beads at parts surface.

If you’re worried about dimensional changes, the critical features like holes can be masked before blasting. And beat blasting is mainly used for visual purposes and it is a manual process meaning that the results may differ depending on the skills of the operator.

The pros of blasting are a uniform and textured finish and it is a relatively low cost surface finish. The cons are that it’s a manual process and it can influence dimensional tolerances and surface roughness. To conclude, bead blasting is used to create a matte uniform finish when dimensional tolerances are not a key concern.

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POWDER COATING

Powder coating is such a finishing method in which dry, free-flowing, thermoplastic, or thermoset powder material is applied (electrostatically) to a surface and then cured under heat or with ultraviolet light. It helps to achieve great product finishes in respect of functionality and appearance.

Unlike anodizing, a powder-coated finish is compatible with all metals, less brittle, and offers greater impact resistance. This finish is suitable for many functional applications but may be particularly well-suited for military applications.

Polishing

Polishing is done to achieve a smooth and shiny surface. Surface is rubbed or applied with a chemical treatment that yields a clean surface with a significant specular reflection. It can also reduce diffuse reflection of some materials to minimum.

Polishing technology is mainly used in precision machinery and optical industries. The surface of the polished CNC workpiece is smooth and has a good reflection effect.

There are 3 types of polishing Process, one is mechanical polishing which is mainly done by manual operations, and the surface roughness can reach 0.82μm through this way; the other process is Chemical polishing, Chemical polishing is a method that relies on the chemical leaching effect of chemical reagents on the uneven area of selective dissolution to eliminate abrasion marks, leaching and leveling. This type polishing equipment is simple, capable of handling thin tubes, with deep holes and complex-shaped parts, high productivity.

The last one often used is Electropolishing. It is used to remove unwanted micro-peaks from metals surface. It is an electrochemical process used to level tiny peaks on the surface and ameliorates surface roughness.

In the industrial production of stainless steel machining, aluminum machining, non-ferrous metals and ferrous metals precision machining, electropolishing has become one of the indispensable surface finishing methods. and the surface roughness of 0.3μm can be achieved.

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Plating

Plating means applying a thin coating of metal. In this method a metal is deposited on a conductive surface. Electroplating helps to improve the strength, durability and life span of metallic parts. There most often used ones include nickel plating/ chrome plating/ tin plating/ silver plating.

Plating can be used for a range of metal materials, like cnc steel machining, spring steel cnc machining, cnc machining stainless, etc.

Surface Finishing Video | Shanghai Elue

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Aluminum anodizing parts

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Aluminum black and red anodizing

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Cnc Small Parts

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Contact us today - If you want to learn more about our CNC machining service or injection molding, write us an email today and we make sure all your rfqs will be replied within 12hours.
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