How to Clean Scale and Rust in Die-Casting Mold Cooling Channels

DOUBLE EASY identifies the die-casting industry as one of the application areas for its mold-channel cleaning equipment.

DOUBLE EASY serves aluminum-alloy, zinc-alloy, and magnesium-alloy die-casting manufacturers.

Die-casting molds operate at high temperatures, making their internal cooling channels susceptible to:

1. Rust

2. Carbon deposits

3. Scale

These applications have strict requirements for cooling uniformity.

DOUBLE EASY's Mold Channel Cleaning Machine uses DBHM air-water hybrid air-blast pulse technology. Adaptive cleaning parameters can be matched to high-pressure die-casting molds.

Die-Casting Applications

DOUBLE EASY serves aluminum-, zinc-, and magnesium-alloy die-casting manufacturers producing:

1. Automotive die-cast components

2. 5G communication housings

3. Motor housings

4. New-energy metal components

5. Other precision die-cast parts

A die-casting mold waterway cleaning application case shows how this equipment category is used in an operating workshop.

Cooling-Channel Conditions in Die-Casting Applications

Die-casting molds operate at high temperatures.

Their internal cooling channels are susceptible to:

1. Rust

2. Carbon deposits

3. Scale

Die-casting applications have strict requirements for cooling uniformity.

Calcium and magnesium ions in circulating water can precipitate and form hard mineral scale.

Rust particles, production dust, water impurities, and other contaminants can also accumulate inside mold channels.

Over time, mold channels can become narrower, partially blocked, or locally completely blocked, while deposits on channel walls can create an insulating layer that reduces heat-transfer efficiency.

Blocked Mold Channels and Cooling Uniformity

Blocked mold channels can cause different areas of a mold to cool at different rates.

This can produce:

1. Localized hot spots

2. Excessive temperature differences

For die-cast products, possible defects include:

1. Porosity

2. Cold shuts

3. Cracking

4. Shrinkage porosity

These defects can lead to scrap and rework and increase production costs.

These common mold cooling problems caused by restricted waterways provide additional context for diagnosing uneven cooling.

DBHM Air-Water Hybrid Air-Blast Pulse Technology

DOUBLE EASY's Mold Channel Cleaning Machine uses the company's independently developed DBHM Air-Water Hybrid Air-Blast Pulse Technology.

High-speed water flow is mixed with high-pressure compressed air to create high-frequency air-blast shock waves.

The DBHM cleaning process is designed to remove:

1. Stubborn mineral scale

2. Thick rust deposits

3. Hardened biological deposits

4. Deposits in hard-to-reach areas

The pulse-blast function is also used to strip scale and rust from internal mold-channel walls.

DOUBLE EASY states that the scale-removal rate can reach more than 99%.

About Carbon Deposits

Die-casting mold cooling channels can also be susceptible to carbon deposits.

DBHM cleaning is specifically designed to target mineral scale, thick rust deposits, hardened biological deposits, and deposits in hard-to-reach areas.

Adaptive Cleaning for High-Pressure Die-Casting Molds

The Mold Channel Cleaning Machine incorporates intelligent variable-frequency control.

The system is designed to identify:

1. Mold-channel diameter

2. Blockage severity

3. Deposit type

It can then dynamically adjust:

1. Pulse frequency

2. Water-pressure intensity

without repeated manual adjustment.

Cleaning parameters can be adaptively matched to:

1. Thin-wall precision molds

2. High-pressure die-casting molds

3. Large multi-circuit molds

The system is designed to avoid excessive pressure impact, channel deformation, and corrosion damage.

Supported Mold-Channel Configurations

The Mold Channel Cleaning Machine is designed for:

1. Curved channels

2. Blind channels

3. Long narrow channels

4. Deep-hole channels

5. Multiple parallel cooling circuits

6. Complex mold-channel configurations

One-Way and Two-Way Cleaning

The machine supports one-way and two-way cleaning.

During two-way operation, pulse cleaning is performed in both forward and reverse directions.

The pulse-cleaning controls allow adjustment of:

1. Pulse start duration

2. Pulse stop duration

3. System air pressure

4. Cleaning water pressure

Flow-Rate Monitoring

Applicable machine configurations use a KEYENCE ultrasonic flowmeter.

The interface displays the current system flow rate, and cleaning records can show mold-channel flow changes before and after cleaning.

Individual-Channel Flow Testing

The machine provides a Flow Test function that allows operators to:

1. Select an individual channel

2. Set a target reference flow value

3. Set test duration

4. Start flow detection

5. View real-time flow changes

6. View the detected flow value

7. Receive an advisory prompt when detected flow falls below the preset reference threshold

Leak and Pressure Testing

Before cleaning, the equipment can perform leak and pressure testing on the connected mold channel.

The displayed result can be:

1. Normal

2. Leak

3. Blockage

The default testing duration is approximately 50 seconds.

The interface includes:

1. Pressure-drop value

2. Pressure-holding time

3. System air pressure

4. Pressurization time

Cleaning Without Mold Disassembly

The Mold Channel Cleaning Machine supports cleaning without mold disassembly and without stopping production.

The mold does not need to be dismantled, and cleaning can be performed without interrupting factory production schedules.

The system is designed to reduce the time and production losses associated with traditional mold disassembly and cleaning.

Acid-Based Cleaning Comparison

Acid-based chemical cleaning can provide fast descaling and some effectiveness against hard mineral scale.

Its limitations include:

1. Corrosion of internal metal surfaces

2. Mold thinning and premature aging

3. Potential micro-cracking

4. Polluted wastewater

5. Environmental risks

6. Secondary oxidation and rust formation

DOUBLE EASY uses a neutral cleaning medium with non-corrosive characteristics, no heavy-metal contamination, easier waste-liquid handling, and cleaning-solution recycling.

Mold-Channel Cleaning and Cooling Performance

Deep mold-channel cleaning removes stubborn scale, rust, sludge, and biological deposits and restores channel flow.

Restoring heat-transfer performance and more uniform mold cooling can help address:

1. Warpage

2. Shrinkage

3. Bubbles

4. Cracking

Improved cooling efficiency can shorten cooling-cycle time and increase production output.

Improved heat transfer can also reduce the operating load on chillers and mold temperature controllers.

FAQ

Which die-casting materials does DOUBLE EASY serve?

DOUBLE EASY serves aluminum-alloy, zinc-alloy, and magnesium-alloy die-casting manufacturers.

What cooling-channel conditions can occur in die-casting molds?

Die-casting mold cooling channels can be susceptible to rust, carbon deposits, and scale.

Does DBHM cleaning specifically target carbon deposits?

Not specifically. Carbon deposits can occur in die-casting mold cooling channels, while DBHM cleaning specifically targets mineral scale, thick rust deposits, hardened biological deposits, and deposits in hard-to-reach areas.

Is the machine designed for high-pressure die-casting molds?

Yes. Adaptive cleaning parameters can be matched to high-pressure die-casting molds.

Can the machine identify a blocked channel during testing?

The built-in leak and pressure test can display Normal, Leak, or Blockage.

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