Sandblasting is a commonly used surface treatment technology in the casting process. It impacts the surface of the casting by high-speed jetting abrasive to achieve the purpose of cleaning, strengthening or modification.
Die Casting
The usual functions of sandblasting are:
Clean the surface of the casting to remove impurities such as surface oxide scale, sticky sand, and residual molding sand. Used for pre-treatment of casting coating/plating to increase surface roughness and facilitate the adhesion of subsequent coatings (such as painting and electroplating). Modify the appearance of the casting surface to obtain a uniform surface texture or matte effect. Weld and defect repair. Clean the weld area to facilitate the detection of cracks or pores; remove surface impurities before repair.
Used for cleaning thin-walled parts or complex structural parts of precision castings (such as silica sol casting) to avoid mechanical damage.
Shot Blasting
Die Casting
Shot blasting is a commonly used surface cleaning and strengthening process in post-casting treatment. It impacts the surface of castings with metal abrasives (such as steel shot, steel sand, etc.) at high speed to achieve the purpose of cleaning, strengthening or improving surface properties. Shot blasting is usually used for:
Die Casting
Casting cleaning, removal of molding sand and oxide scale. After the casting is demolded, the sand, binder or oxide layer remaining on the surface can be quickly removed by shot blasting. And cleaning burrs and residual parts after cutting. Surface strengthening (shot peening strengthening). Improve the fatigue life of parts, enhance the resistance to stress corrosion, and prevent fatigue cracks. Pre-treatment of casting coating/plating. Increase surface roughness (Ra value) and improve the adhesion of paint, electroplating or thermal spraying. Weld and defect repair. Clean the weld area to facilitate the detection of cracks or pores; remove surface impurities before repair. Eliminate residual stress in castings and reduce the risk of deformation in subsequent processing.
Vibration Grinding
Die Casting
Vibratory grinding involves placing a workpiece and abrasive (ceramic blocks, resin particles) in a vibrating chamber. High-frequency vibrations create friction between the abrasive and workpiece, resulting in surface polishing or deburring.
Plastic Spraying
Die Casting
Electrostatic powder coating is a metal surface treatment technique that uses electrostatic attraction to evenly apply powder coating to the workpiece surface, then cures at high temperatures to form a protective coating. Electrostatic powder coating process:
Die Casting
Pretreatment Degreasing: Soak in an alkaline solution for 5-15 minutes to remove oil stains. Rust removal: Acid pickling or mechanical sandblasting to remove the oxide layer. Phosphating: Produces a gray phosphate film to enhance adhesion and corrosion resistance. Electrostatic Spraying Using a dedicated spray gun, the powder is charged in an electrostatic field and evenly adsorbed to the workpiece. High-Temperature Curing The workpiece is heated in a curing oven at 185-200°C for 15-20 minutes to melt and level the powder, forming a dense coating. Post-Treatment After cooling, optional decorative finishes may be applied.
Electrophoresis
Die Casting
The electrophoretic coating process uses an electric field to drive the directional migration and deposition of charged particles onto the workpiece surface. Based on electrochemical principles, the electrophoretic process uses an applied electric field to cause charged particles (such as resins and pigments) suspended in an electrophoretic fluid to migrate and deposit onto the electrode surface.
Die Casting
Electrophoretic Process Flowchart: Pretreatment: Degreasing, rust removal, phosphating, etc. to ensure a clean workpiece surface. Electrophoretic Deposition: The workpiece is immersed in an electrophoretic tank and a DC Voltage (typically 0-400V) is applied for coating Final Rinse: The tank fluid is recovered using an ultrafiltration system to control conductivity. Curing: Pre-baking (70-80°C) followed by high-temperature curing (170-180°C/30 minutes). High-Temperature Curing The workpiece is heated in a curing oven at 185-200°C for 15-20 minutes to melt and level the powder, forming a dense coating. Post-Treatment After cooling, optional decorative finishes may be applied.
Anodizing
Die Casting
To overcome the surface hardness and wear resistance deficiencies of aluminum alloys, expand their applications, and extend their service life, surface treatment technology has become an indispensable component of aluminum alloy use. Anodizing is the most widely used and successful technology. Anodizing aluminum and its alloys form an oxide film on the aluminum product (the anode) under the action of an applied current in a suitable electrolyte and specific process conditions.
Die Casting
Anodizing Process Route: Pretreatment: Degreasing, alkaline etching (removal of the oxide layer), neutralization, and polishing. Anodizing: The aluminum part serves as the anode, is placed in an electrolyte (such as sulfuric acid solution), and current (DC, 12-20V) is applied to form a porous oxide film. Sealing: Hot water sealing or cold sealing agents seal micropores and improve corrosion resistance. Coloring: Electrolytic coloring (metal salt penetration) or dye adsorption. Anodizing can produce oxide films (5-25μm thick) in transparent, black, or gold colors, preserving the metallic texture of the part and allowing for matte or glossy finishes. At the same time, properties such as hardness, wear resistance, high temperature resistance, insulation and corrosion resistance have been significantly improved.
Detailed drawings of parts (three-view engineering drawings, 3D drawings), procurement quantity, material grade requirements, and surface treatment requirements.
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Squeeze casting is suitable for producing parts with high requirements for precision, mechanical properties, and strength. Compared with traditional casting processes, parts produced by our squeeze casting process have denser internal microstructures, higher part density, higher dimensional accuracy, and higher strength.
We can customize the raw materials according to customer requirements. Aluminum alloys include: ADC12, A356, A380, ZL101, ZL102, etc.; zinc alloys include ZAMAK3, ZAMAK5, etc.
