Dry Polishing Machine

Dongguan Xindingsheng Intelligent Grinding Technology Co., Ltd. is one of the leading manufacturers and suppliers of dry polishing machine in China, featured by quality products and good price. Please rest assured to wholesale bulk customized dry polishing machine from our factory. For quotation, contact us now.

This machine is a specialized centrifugal finishing machine for precision mirror polishing, designed exclusively for ultra-high precision surface grinding. Driven by a 7.5KW precision variable-speed motor, it features a speed adjustment range of 0–120 RPM with extreme low-speed grinding stability, achieving a grinding precision of Ra0.02μm to realize mirror-finish polishing on workpiece surfaces.
It is equipped with 4 sets of precision hexagonal barrels; the inner barrel is made of imported soft polyurethane with a smooth, particle-free surface, eliminating secondary scratches on workpieces during grinding. The barrel drive adopts a high-precision grinding gear set with a transmission clearance ≤0.01mm, ensuring shake-free and deflection-free operation for uniform grinding.
The fully enclosed barrel assembly adopts a dust-proof and leak-proof design, preventing grinding media and fluid from escaping, fully compliant with clean workshop requirements. It is also fitted with a precision grinding fluid circulation & filtration system to maintain fluid cleanliness and enhance mirror polishing effects. All workpiece-contacting parts are treated with anti-scratch finishing to avoid workpiece damage. The whole machine adopts a precision speed control system with a minimum adjustment unit of 0.5 RPM, enabling micro-speed grinding to perfectly meet the ultra-high precision grinding demands of aerospace, precision instruments and other high-end industries.

(1) Overall Structure

Adopting a precision dust-free design, the machine consists of a precision cold-rolled steel upper cover, shockproof precision base, precision barrel turntable assembly, dust-proof electrical cabinet and precision receiving tank. All components are precision-machined and anti-scratch treated, suitable for clean workshops and precision processing workshops.

• Upper Cover: Made of thin high-strength precision cold-rolled steel with mirror spray coating (anti-scratch and easy to clean). The front protective sliding door is transparent acrylic (dust-proof type) for real-time process monitoring, equipped with a high-precision travel switch (power cut-off when opened). The double-end ventilation louvers adopt dust-proof fine-pore filters to block dust and grinding media.
• Base: Welded with precision channel steel, fitted with precision shock-absorbing air cushion feet to absorb micro-vibration and ensure grinding accuracy. The motor fixing plate adopts a precision micro-screw adjustment structure for micron-level belt tension adjustment to reduce transmission vibration. The inner base is equipped with a small precision liquid collection tank and filtration circulation port connected to the grinding fluid system.
• Barrel Turntable Assembly: The large turntable is die-cast from aluminum alloy and precision-ground with a flatness error ≤0.02mm. Each barrel has a 22L precision design with a precision spin-on locking cover and imported food-grade silicone sealing ring for excellent sealing. The inner PU barrel is clip-mounted for easy replacement. The turnover mechanism uses a precision micro-worm reducer for slow, high-precision turnover and collision-free unloading.
• Dust-Proof Electrical Cabinet: IP55 dustproof and waterproof grade, built-in dehumidifier and dust filter to protect electrical components from moisture and dust. Equipped with a touch control panel for precise operation without mechanical key wear.
• Grinding Fluid Circulation System: Composed of a micro water pump, precision filter and infusion pipe, realizing filtered grinding fluid recycling.

(2) Working Principle

Adopting the "Ultra-Low Speed Precision Revolution + Micro-Speed Uniform Rotation" mirror grinding principle: the 7.5KW precision variable-speed motor drives the aluminum alloy precision turntable for ultra-low speed revolution via a precision pulley. Driven by the high-precision gear set, 4 barrels rotate uniformly at micro-speed, generating extremely gentle and uniform dual centrifugal force.

Precision workpieces and mirror polishing media form an ultra-low-density uniform grinding zone under centrifugal force. The media polishes the workpiece surface with micro-force, full coverage and scratch-free friction. Long-term low-speed grinding gradually removes micro-scratches and roughness, finally achieving a mirror finish without deviating from workpiece dimensional accuracy.

Equipped with an imported precision variable-speed inverter + touch control panel, with a speed adjustment accuracy of ±0.5 RPM, supporting micro-speed grinding (3–10 RPM) specially designed for mirror polishing. The panel can store 5 sets of commonly used mirror polishing process parameters for one-key recall, reducing manual debugging time and ensuring process consistency.
Full-range precision safety protection: dual travel switch interlock, barrel cover unclosed protection, grinding fluid low-level alarm and micro-vibration alarm. The machine cannot start if the barrel cover is not tightened, alarms automatically when fluid is insufficient, and shuts down immediately if vibration exceeds the standard, guaranteeing grinding accuracy and equipment safety. The electrical system adopts low-voltage dust-free control for safer operation, static electricity prevention, complying with clean workshop electrical safety standards.

(1) Installation Requirements
1.Place the machine on a level epoxy floor in a clean workshop, install precision shock-absorbing air cushion feet, and adjust to a flatness error ≤0.05mm with a precision level gauge (no shaking).
2.Test the motor winding insulation resistance with a 500V megohmmeter (resistance ≥0.5 MΩ) to ensure good insulation and static prevention.
3.Connect to 380V three-phase industrial power (voltage stability: 380±5V), equip an independent dust-proof power switch, and connect grounding and anti-static grounding wires (grounding resistance ≤3Ω).
4.Connect the grinding fluid circulation system, check for leaks, then run idle for 15 minutes to verify smooth operation, no micro-vibration and accurate touch screen display before formal use.

(2) Later Adjustment
1.Every 400 operating hours, check motor belt tension and adjust via the micro-screw structure (belt deflection: 0.5–1cm under pressure); replace with dust-free anti-static belts.
2.Check barrel turnover chain tension and fine-tune with a micro tensioner to avoid vibration affecting precision.
3.Regularly inspect the precision filter of the circulation system and replace clogged filter elements to maintain grinding fluid cleanliness.

(1) Operation Steps
1.Turn on the power and grinding fluid circulation system, unlock the touch panel, select preset mirror polishing parameters or manually set speed and grinding time.
2.Jog the switch to adjust the barrel to 5° forward tilt, then unscrew the precision spin-on cover.
3.After ultra-clean degreasing, anti-static and scratch-free treatment, put workpieces and mirror polishing media into the barrel at a ratio of 1:4 (loading capacity: 50%–60% of barrel volume), add special mirror polishing agent and deionized water, and activate the circulation system.
4.Start the machine for ultra-low speed operation; stop for 10 minutes of ventilation cooling every 120 minutes of continuous grinding to prevent inner barrel aging.
5.After grinding, stop the machine and close the circulation system, jog the barrel to slowly turn to the unloading position, pour workpieces and media into the precision receiving tank, and immediately perform ultra-clean cleaning and dust-free storage of workpieces.

(2) Daily Maintenance
1.After 300 operating hours, apply dust-free anti-static precision bearing grease to all bearings and clean bearing parts with a dust-free cloth to block dust and grinding media.
2.After daily operation, clean the barrel interior, receiving tank and circulation system with deionized water, dry with a dust-free cloth, and perform anti-scratch and anti-static treatment on all workpiece-contacting parts.
3.Weekly: Open the dust-proof electrical cabinet, clean internal dust with a dust-free air blower, check the dehumidifier and filter, and tighten loose wiring terminals.
4.Monthly: Calibrate parameters of the touch panel and inverter, and precisely detect the flatness and coaxiality of the turntable and barrels to ensure grinding accuracy.
5.Daily dust cleaning of the machine surface in clean workshops, and regular inspection of anti-static performance to meet clean workshop standards.

Suitable for mirror polishing and ultra-precision deburring of ultra-high precision parts in aerospace, precision instruments, optical equipment, high-end watches and other industries, including titanium alloy precision parts, stainless steel mirror parts, copper precision parts and aluminum alloy high-gloss parts. Fully meets the ultra-high precision grinding requirements of clean workshops and precision processing workshops.

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