Our Parts Finishing Capabilities
Whether it is CNC machined, urethane cast or 3D printed parts, to gain an accurate appearance of your final product, the prototype must undergo a rigorous post finishing process, which describes the final steps required before a product can be truly brought to life.
DADESIN provides an integrated parts finishing service to meet your diverse needs. With our experienced in-house skills and advanced facilities, we try our best to ensure the color, texture, gloss, and surface finish of parts and exceed your expectations.
DADESIN in-house prototype processing is capable of providing the best post finishing, including hand-finishing, sanding, blasting, polishing, painting, and printing. We also offer a wide array of specialty surface finishing, including laser etching, anodizing, powder coating, metal plating, vacuum metalizing, chromate, chemical finishing, passivation, heat treatments, etc.
CNC Machined Finish
Machined parts will have marks that follow the path of the cutting tool. The machined finish is that a smooth surface, created by a machine without polishing work, only needs a little handwork to clear the bur, the part could be finished and delivered quickly soon after off the machine.
The standard machined surface roughness is Ra 3.2-1.6 μm;
The smooth machined surface roughness is Ra 1.6-0.8 μm;
The super-finished surface roughness is Ra 0.8-0.2 μm.
The finishing will increase the cost of producing a part, as extra machining steps and tighter quality control are required.
Bead blasting adds a uniform matte surface finish on a machined part, removing the marks of tool and sandpaper. It is the operation of forcibly propelling a stream of abrasive material against a surface under high pressure to smooth a rough surface, roughen a smooth surface, or remove surface contaminants. The size of the air pressure and the size of the glass beads are the main process parameters. Glass beads come in different sizes from #80 to #220.
Anodizing helps to resist corrosion, increase surface hardness, improve resistance to wear. This process serves both functional and cosmetic purposes. There are two main types of anodizing:
Type II anodizing is mainly used to produce parts with a uniform, aesthetically pleasing surface and provides good corrosion and limited wear resistance, and has a wide variety of color dye options. The typical coating thickness: 12-18 μm for black, 8-12 μm for clear, 4-8 μm for color.
Type III anodizing also known as hard anodizing, provides excellent corrosion and wear resistance, suitable for functional applications, but is more limited in color—often clear or black only. The typical thickness 30-125 μm.
Powder coating adds a thin layer of protective polymer on the surface of the part. It uses corona discharge phenomenon to make powder coating adsorbed on the workpiece, which is a strong, wear-resistant finish. The typical thickness varies from approximately 50 μm up to 150 μm.
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