Manual polishing and dry-ice blasting cannot reach inside fine injection mold gas vents, ejector pin clearances, or cooling water channels—and abrasive scrubbing rounds off critical parting-line edges. An electrolytic ultrasonic cleaning machine combines cathodic hydrogen micro-bubble generation with 28/40 kHz acoustic cavitation to strip baked-on polymer outgassing residues (POM, PVC, flame-retardant PA66), mold release agents, and sulfide scale without removing base tool steel.
1. How Cathodic Electrolysis + 28/40 kHz Cavitation Works on Tool Steel
When an injection mold core is immersed in an alkaline electrolyte inside our JTM-4036DJ Mold Electrolytic Ultrasonic Cleaning & Drying Machine or JTM-6084FD Electrolytic Ultrasonic Cleaning Machine, pulsed DC current generates dense hydrogen micro-bubbles directly at the metal-contaminant interface while 28/40 kHz transducers collapse cavitation bubbles across deep cavities. This dual action lifts carbonized resin and rust inhibitor grease while preserving tool steel geometry on H13, S136, or NAK80 mirror surfaces.
2. Jietai Electrolytic Mold & Heavy Hoist Ultrasonic Equipment Matrix
| Model | Equipment Configuration | Frequency / Ultrasonic Power | Tank / System Architecture | Target Tooling & Molds |
|---|---|---|---|---|
| JTM-4036DJ | Mold Electrolytic Ultrasonic Cleaning & Drying Machine | 28 / 40 kHz / 1,800 W + DC electrolysis | 4-tank: electrolytic ultrasonic cleaning + manual air blowing + rust prevention + hot air drying | Medical & optical injection mold cores, gas vents, runner plates |
| JTM-80120AD | Fully Automatic Ultrasonic Cleaning Machine | 28 / 40 kHz / 6,000 W automatic line | Multi-stage PLC automated mold cleaning & drying | High-cavitation multi-cavity automotive & connector molds |
| JTM-6084FD | Electrolytic Ultrasonic Cleaning Machine | 40 kHz ultrasonic + electrolysis | 6-tank electrolytic ultrasonic cleaning system | Semiconductor stainless steel valve body parts & precision hardware |
| JTM-40480FD | Ultrasonic Cleaning Machine with Electric Hoist Lifting | 28 kHz / 24,000 W heavy-duty | 4-tank system with overhead electric hoist lifting | Heavy die-casting molds, engine blocks, large bolster plates |
3. Multi-Stage Rinse, Rust-Preventive Passivation & Hoist Handling
- 4-Tank to 8-Tank Automated Mold Lines: Compare the JTM-4036DJ 4-Tank Mold Electrolytic Cleaner, the fully automated JTM-80120AD Injection Mold Ultrasonic Cleaning Line, and the JTM-6084FD Electrolytic Ultrasonic Cleaning Machine.
- Heavy Die Handling & Consumables: For bolsters exceeding 100 kg, our JTM-40480FD Ultrasonic Cleaning Machine with Electric Hoist Lifting provides motorized overhead crane loading, paired with Cleaning Sheet formulations.
4. SUS304 / SUS316L Tank Construction, Transducer Bonding & Acoustic Power Sizing
In industrial production environments, the structural integrity of an ultrasonic cleaning tank directly governs cavitation uniformity and service life. Guangdong Jietai fabricates standard benchtop baths (0.8 L to 30 L across the JPS series) with stamped SUS304 stainless steel inner tanks, while floor-standing single-tank (JTS series) and multi-tank (JTM, JT, JTV, and JTW series) industrial lines utilize heavy-gauge argon-arc welded SUS304 or optional SUS316L stainless steel plates. The radiating surface where piezoelectric transducers are mounted undergoes precision surface preparation, stud welding, and high-strength epoxy bonding so acoustic energy transfers into the liquid bath without delamination under continuous thermal cycling between room temperature and 80 °C.
When sizing ultrasonic power for industrial tanks, relying on a fixed watts-per-liter rule across all tank volumes causes under-powering in small tanks and excessive surface cavitation in deep tanks. Benchtop chambers between 2 L and 30 L typically operate at higher volumetric density (20 W/L to 40 W/L) because the liquid depth is shallow (100 mm to 200 mm). As industrial tank volumes scale from 38 L up to 500 L or 1,000 L in multi-tank gantry lines, acoustic design shifts from bottom-only transducer mounting to combined bottom-and-sidewall transducer arrays or drop-in immersible ultrasonic vibration plates (JTP-1008S through JTP-1048S). Positioning transducers along vertical sidewalls ensures that tall workpieces—such as hydraulic barrels, injection mold cores, or stacked wafer cassettes—receive uniform cavitation across their entire vertical profile rather than only near the tank floor.
Each transducer bank is driven by independent external digital ultrasonic generators (JTF series, 900 W to 2,400 W per module) housed in ventilated electrical cabinets separated from the wet chemical zone. Separating the generator electronics from humid acid, alkaline, or hydrocarbon vapor atmospheres prevents circuit board corrosion and allows maintenance technicians to adjust current output and frequency sweep parameters directly from the front control panel.
5. Workpiece Basket Loading, Degassing & Recirculation Filtration Operating Protocol
Even a properly sized multi-tank ultrasonic cleaning line will produce inconsistent cleanliness if parts are stacked directly on the tank bottom or if dissolved air and floating oils are not managed during production shifts. Workpieces must always be suspended inside perforated or wire-mesh SUS304 stainless steel baskets (or dedicated fixture racks for optical lenses, silicon wafers, and fuel injectors) maintained at least 30 mm to 50 mm above the bottom radiating plate. Placing heavy steel molds or hydraulic cylinders directly onto the tank floor dampens transducer vibration, reflects acoustic standing waves back into the piezoelectric crystals, and accelerates cavitation erosion on the stainless steel weld seams.
Whenever a tank is filled with fresh tap water, deionized water, aqueous alkaline detergent, or hydrocarbon solvent, dissolved gases must be evacuated before precision parts are loaded. Running the ultrasonic bath (or engaging the degas mode on JPS multifunctional units and vacuum chambers on hydrocarbon systems) for 10 to 20 minutes coalesces dissolved micro-bubbles so they rise and vent from the liquid. Without degassing, dissolved air cushions the implosion of cavitation bubbles and leaves air pockets trapped inside blind tapped holes, ejector pin bores, and capillary channels.
During continuous degreasing of stamped hardware, machined castings, or automotive components, emulsified cutting fluids and tramp oils accumulate at the liquid surface. If parts are lifted straight up through a floating oil film, the oil re-deposits onto the freshly cleaned metal surfaces before rinsing. Integrating a weir overflow skimming trough, an oil-water separator, and a pump-driven recirculation filtration canister (using replaceable polypropylene filter cotton cores) continuously sweeps floating oils and suspended particulates out of the primary wash tank. In multi-tank JTM-FRD and JTM-FRSD configurations, pairing a filtered wash stage with counter-current overflow rinsing and turbine hot-air drying ensures that detergent surfactants and mineral ions are completely flushed prior to thermal dehydration.
6. Pre-Order Engineering Specification & Sample Verification Checklist
To configure either a standard catalog model or a non-standard customized multi-tank ultrasonic line at our Dongguan manufacturing facility, engineering and procurement teams should define five core process parameters before requesting a formal layout drawing and quotation:
- Workpiece Geometry, Material & Batch Weight: Provide the maximum external dimensions (length × width × height in millimeters), wall thickness, alloy or substrate type (carbon steel, aluminum alloy, brass, tool steel, optical glass, or silicon wafer), and the target weight or piece count per basket load.
- Contaminant Composition & Upstream Process: Specify whether parts carry neat mineral stamping oil, water-soluble CNC coolant, cerium oxide polishing slurry, rosin solder flux, polymer outgassing carbon, or lapping paste, as this dictates whether an aqueous alkaline line, an electrolytic mold cleaner, or a closed-loop hydrocarbon/vapor-phase system is appropriate.
- Blind Holes, Internal Channels & Surface Sensitivity: Indicate the smallest internal bore diameter or slot width and whether polished or coated surfaces require dual-frequency switching (28/40 kHz), high-frequency optical rinsing (80/120 kHz), or 950 kHz megasonic acoustic streaming.
- Drying & Rust-Prevention Requirements: Confirm whether downstream assembly or coating requires ambient air blow-off, rust-preventive passivation immersion, high-velocity air knives, hot-air circulation tunnel drying, rotary centrifugal spin drying, or vacuum drying.
- Plant Utilities & Footprint Constraints: Note available factory floor length, ceiling clearance for overhead electric hoists or PLC gantry cranes, three-phase electrical supply specifications, and whether auxiliary pure water (RO+EDI), recirculating water chillers, or industrial wastewater treatment modules should be integrated into the turnkey line.
Frequently Asked Questions (FAQ)
Does electrolytic ultrasonic cleaning etch or pit mirror-polished S136 mold cavities?
No. Because the mold acts as the cathode in an alkaline electrolyte, metal dissolution does not occur; hydrogen evolution and 28/40 kHz cavitation strip only organic polymer deposits, sulfides, and oxidation films.
Why does the JTM-4036DJ use 4 tanks instead of a single tank?
The 4-tank JTM-4036DJ configuration integrates (1) electrolytic ultrasonic cleaning, (2) manual air blowing, (3) rust-prevention immersion, and (4) hot-air drying so clean mold inserts never re-contact floating carbon scum.
What frequency is best for cleaning fine injection mold gas vents?
28 kHz provides high-energy cavitation for heavy parting-line grease, while 40 kHz penetrates 0.02–0.05 mm gas vents and micro-ribs.