The composition and application of the heat sink shot blasting machine
The abrasive blasting machine for heat sinks is a crucial process in the production line of heat sinks, mainly used to remove surface oxide scales, welding slag, and rust, providing better adhesion for the subsequent spraying process.
For heat sinks, the mainstream abrasive blasting machines have three main technical routes, and their composition and application characteristics are as follows:
1. Main equipment types and system composition
Although the structures of different equipment vary, a complete heat sink abrasive blasting machine usually includes the following core systems:
Workpiece conveying system: Responsible for sending heat sinks into and out of the equipment. Common types include roller conveyor and suspended type (hook/suspension chain).
Abrasive blasting chamber: The enclosed space for abrasive blasting operations. Inside, there are high-manganese 13 protective plates to protect the chamber from being damaged by the abrasive.
Abrasive blasters: The core components of the equipment. Through the high-speed rotating impeller, the abrasive is accelerated and ejected onto the surface of the workpiece. To cover the complex structure of the heat sink, multiple abrasive blasters are usually arranged, and the cleaning is carried out from multiple angles such as top, bottom, and both sides.
Abrasive pellet circulation system: Automatically recovers used abrasive pellets. Through spiral conveyors, bucket elevators, and abrasive sand separators, the intact abrasive pellets are separated from debris, dust, and other impurities, allowing for recycling.
Dust collection system: Used to collect dust generated during the cleaning process. Usually, a two-stage bag filter is adopted to ensure compliance with environmental protection standards.
Electrical control system: Generally controlled by PLC (Programmable Logic Controller), it can achieve one-click operation, fault alarm, and interlock protection between the abrasive blasters and the pellet supply valve to ensure safety.
2. Comparison of three mainstream models' applications
For different production volumes and types of heat sinks, the following types of equipment can be selected:
Horizontal/through-type abrasive blasting machine
Composed of an upper feeding roller conveyor, abrasive blasting chamber, and lower feeding roller conveyor, the heat sinks are placed horizontally on the roller conveyor, and the heat sinks lie flat and pass through the abrasive blasting chamber. Abrasive blasters are arranged on top and bottom and from both sides to clean the upper and lower surfaces simultaneously.
Suitable for batch production of specific shapes such as transformer heat sinks. The advantage is high automation and suitability for assembly line operations.
Hanging hook-type abrasive blasting machine: Equipped with a single rail or circular track, and one or more electric hoists/hooks, the heat sinks are hung on the hooks and sent into the abrasive blasting chamber. After passing through the abrasive blasting chamber, the hooks rotate to allow the workpiece to receive comprehensive blasting.
Suitable for the production of multiple varieties and small batches of heat sinks, or heat sinks with complex shapes. It is highly flexible, but requires manual hanging.
Chain suspension-type abrasive blasting machine: Uses a continuous running circular chain. The chain is hung with multiple hooks. The workpiece moves uniformly through the abrasive blasting chamber and the dust removal chamber to achieve continuous operation in a flow pattern.
Suitable for large-scale, uniform heat sinks or heat sinks. The efficiency is the highest, but the equipment has a large floor area.
3. Application value and process key points
Core function: Abrasive blasting not only can completely remove the oxide scales and rust on the surface of the heat sink, but also can form a uniform roughness on the surface, which is crucial for improving the adhesion of the subsequent primer and the corrosion resistance, and completely replaces the traditional highly polluting acid washing process.
Post-treatment time: The surface after abrasive blasting is very active and prone to re-oxidation. Generally, it is recommended to complete the primer spraying within 4 to 12 hours after cleaning. If the air humidity is high (≥85%), the interval time should be shortened to within 4 hours.
Process details: The angle of the abrasive blaster, the size of the abrasive (usually 0.3-0.8mm steel balls), and the cleaning speed need to be adjusted according to the specifications of the heat sink to avoid missed blasting or damage to thin-walled heat sinks.