An alternating magnetic field generated at the bottom of the equipment drives stainless steel needles in the tank to move disorderly and at high speed. The flowing needles scour workpiece surfaces, gaps and inner holes. With the lubrication and cooling of polishing fluid, micro burrs, tool marks and oxide layers are efficiently removed. Workpieces can be placed freely or fixed with simple tooling. The entire process involves no hard impact and causes negligible dimensional loss.
Dry burnishing cannot handle micro holes and deep holes, while magnetic polishing is the most mature process for such workpieces.
3C precision connectors, charging terminals, camera bushings, sensor sleeves; Hydraulic and pneumatic small valve bodies, valve cores, micro tubing joints; Screws, nuts, precision threaded parts, threaded die-cast small components; Medical micro intubation parts, dental orthodontic hardware, puncture auxiliary parts.
Tiny parts are prone to collision damage and require strict dimensional tolerance control with zero edge wear allowed.
MIM micro stainless steel components, mobile phone decorative rings, micro key shrapnels; Clock movement accessories, glasses nose pad micro brackets, jewelry spacers; Humanoid robot dexterous hand micro connectors, micro conductive terminals.
Such parts feature narrow gaps and numerous dead corners inaccessible to ordinary abrasives, while ultra-fine steel needles can penetrate tiny slits for thorough finishing.
Micro heat dissipation fins, multi-layer stamping shrapnels, porous filter hardware; Hollow jewelry ring holders, multi-layer carved crafts, precision lock cylinder small parts.
Zinc alloy, aluminum alloy, copper, silver and TC4 titanium alloy produce no magnetic attraction, so steel needles will not adhere or jam, ensuring stable polishing quality. These materials are easily damaged by collision in drum dry burnishing, while magnetic soft polishing perfectly protects their appearance integrity.
Zinc alloy small jewelry, aluminum precision housings, brass conductive accessories; Silver ornaments, K-gold small parts, TC4 titanium alloy medical auxiliary implants.
The process only removes micro burrs and surface impurities without changing the original workpiece contour, ensuring uniform plating layers without pinholes in subsequent surface treatment.
Ferromagnetic workpieces (Iron, Carbon Steel): Strong magnetic force adsorbs steel needles, causing needle jamming in holes and gaps. Residual needles lead to workpiece blackening, assembly jamming and poor surface treatment.
Workpieces requiring large outer surface leveling: No strong cutting capability to remove thick parting lines and deep CNC tool marks.
Large heavy workpieces and long profiles: Extremely low single-batch loading capacity results in low efficiency and high processing cost.
Large appearance parts requiring uniform matte or mirror finishes: Limited brightening effect cannot achieve uniform and high-quality surface texture.
Ultra-fine steel needles penetrate micro holes as small as 0.1mm, blind holes and thread roots to remove internal burrs that dry burnishing cannot eliminate, solving assembly jamming, wire scratching and plating leakage problems.
Processing relies on flexible friction of flowing steel needles without hard abrasive impact. Thin-walled parts and precision micro components maintain complete edges and stable micron-level dimensional tolerance after processing.
Applicable to zinc, aluminum, copper, silver and titanium alloy. Low-intensity flexible grinding avoids deep scratches on soft metal surfaces, making it ideal for precious metal parts and thin die-cast components.
Most small parts can be bulk-processed directly in the tank without single-piece clamping required by drag or vertical burnishing machines. Model replacement and sample debugging are efficient and convenient.
The polishing fluid integrates lubrication, decontamination and anti-rust functions. Workpieces are thoroughly cleaned after processing, with micro dust and metal debris completely removed, leaving no residual deposits in gaps.
Only micro surface burrs are removed without destroying the original flatness and sealing datum of workpieces, suitable for precision matching parts in transmission and hydraulic systems.
It can only remove fine micro burrs. Workpieces with obvious parting lines, deep tool marks and thick oxide layers must be pre-processed by robotic sanding or dry burnishing coarse polishing. Single use of magnetic polishing cannot meet appearance standards.
Carbon steel and iron parts adsorb steel needles firmly. Residual needles in holes cause assembly failure and defective electroplating, forming a hard material adaptation blind spot.
The whole process requires water and polishing fluid. Wet workpieces require additional ultrasonic cleaning and drying procedures after processing. Waste liquid treatment and chemical procurement bring extra costs, failing to meet water-free and environmentally friendly production requirements.
Limited tank volume is only suitable for small-batch precision micro parts. Mass processing of large hardware such as luggage and bathroom accessories leads to sharply increased working hours and labor costs.
Long-term friction causes steel needle bending, fracture and refinement, requiring regular screening, supplement and full replacement. Broken micro needles easily jam in workpiece micro holes, consuming extra sorting labor.
Insufficient brightening capacity easily causes uneven light and shade on outer surfaces. High-end uniform matte or mirror textures must be achieved via secondary dry burnishing finishing.
Magnetic polishing is a professional auxiliary process dedicated to precision inner hole, micro hole and thread deburring, covering the internal dead-angle blind areas of dry burnishing.
Optimal mass production process combination: Robotic sanding for coarse surface leveling → Magnetic polishing for internal hole and gap deburring → Dry burnishing for outer surface matte/mirror brightening.
Factories focusing on precision porous micro parts, medical and 3C components shall adopt magnetic polishing for internal micro burr cleaning. Factories focusing on large-batch appearance parts, long profiles and ferromagnetic iron/carbon steel parts shall prioritize dry burnishing equipment.
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