In the automotive industry, hanger shot blasting is an automated surface-preparation method that cleans large, heavy or geometrically complex metal parts — such as engine blocks, cylinder heads, transmission housings and chassis brackets — of rust, mill scale, foundry sand and oxide before painting, coating or assembly. Parts are loaded onto a hanger (hook) system, rotated inside an enclosed cabin, and cleaned evenly on every surface by steel shot thrown at high velocity from turbines.
What Is Hanger Shot Blasting?
Hanger shot blasting machine is a blasting method in which workpieces are suspended on hooks and cleaned with steel abrasive inside an enclosed cabin. Because each part rotates on its own axis, the abrasive reaches the whole surface without blind spots, removing the inconsistency of manual methods.
Hanger shot blasting machine typically removes:
- Foundry sand and casting burrs
- Rust and corrosion products
- Mill scale (oxide layer) formed after heat treatment
- Weld slag and fabrication residue
- Old coatings before repainting
Which Automotive Parts Are Cleaned by Hanger Shot Blasting?
In automotive work, hanger shot blasting is chosen for parts that are too large, heavy or delicate to be tumbled. The following groups are the most common.
Castings
It removes sand residue and burrs from cast parts such as engine blocks, cylinder heads, transmission housings, turbo housings and exhaust manifolds. The hanger system reaches every point of these thick-walled, internally complex parts.
Heat-Treated and Forged Parts
Hanger shot blasting machine is applied to strip the oxide layer (scale) from heat-treated or forged parts such as crankshafts, connecting rods, gears and axles, leaving a clean surface for the next step.
Chassis and Body Components
Structural items such as brackets, cross-members and subframe parts are prepared with hanger shot blasting before painting or cataphoretic (e-coat) treatment. A clean surface lets the coating lock onto the metal and improves corrosion resistance.
How Does Hanger Shot Blasting Improve Coating Adhesion?
A clean, profiled surface lets the paint interlock mechanically with the metal, which extends corrosion resistance and coating life. Surface preparation is one of the most decisive steps for coating performance.
The cleanliness target before coating is often stated as Sa 2½. A key technical distinction matters here: Sa 2½ is a cleanliness grade, defined in ISO 8501-1, describing how thoroughly rust, scale and dirt are removed. Surface roughness (anchor profile) is a separate property, measured under ISO 8503. The two are frequently confused, but the distinction matters for specifications.
For a visual comparison of preparation grades, independent references such as the SteelConstruction.info surface preparation guide are useful.
| Engineering Note Hanger shot blasting is not the same as shot peening. Shot blasting cleans the surface and prepares it for coating; shot peening induces controlled compressive residual stress to raise the fatigue life of parts such as springs, gears and crankshafts.In automotive manufacturing these are two different processes on different equipment. For a cleaning application, a hanger shot blasting machine is the right tool. |
Hanger Shot Blasting vs. Tumble Shot Blasting
Part size and fragility decide the choice: hanger shot blasting suits large, heavy parts, while tumble shot blasting suits small cast parts.
| Criterion | Hanger Shot Blasting | Tumble Shot Blasting |
|---|---|---|
| Part size | Large / heavy | Small / medium, bulk |
| Loading | Suspended on hooks | In bulk |
| Part contact | Parts never touch | Parts tumble together |
| Typical auto part | Engine block, transmission housing | Bolts, nuts, small brackets |
| Delicate-surface risk | Low (controlled hanging) | Deformation risk on thin edges/threads |
In short: hanger shot blasting for complex, individual, high-value parts; tumble shot blasting for high-volume, small, robust parts.
Strong Makine Hanger Shot Blasting Machine (AK Series)
Strong Makine hanger shot blasting machines are built in a range of capacities, from the AK-0 model (900 mm basket diameter) to the AK-5 model (2250 mm basket diameter), offering roughly 0.5 to 7.5 tonnes of hanger capacity. The team was founded in 2023, combining around 20 years of sector experience.
Features that stand out for automotive lines:
- Manganese steel liners: wear-resistant cabin interior that extends machine life.
- High-performance turbines: throw abrasive efficiently for homogeneous cleaning.
- Automatic abrasive recovery: a closed-loop system that reduces abrasive consumption.
- Jet-Pulse dust collection: a clean working environment and environmental compliance.
- “Y” or “I” type monorail hangers: easy integration into an existing production line.
Frequently Asked Questions – FAQ
What is hanger shot blasting used for in automotive?
In automotive, hanger shot blasting cleans cast and heat-treated parts of rust, scale and foundry sand before painting or coating. The goal is a clean surface the coating can adhere to firmly.
What contaminants does hanger shot blasting remove?
It removes rust, corrosion, foundry sand, burrs, heat-treatment scale and weld residue, leaving the surface ready for paint or coating.
What is the difference between hanger and tumble shot blasting?
In hanger shot blasting parts hang on hooks and are cleaned without touching each other, which suits large, delicate parts. In tumble shot blasting small parts are processed in bulk as they tumble together.
Does hanger shot blasting achieve Sa 2½ before painting?
With the right abrasive, turbine setting and cycle time, a Sa 2½ cleanliness grade can be targeted. Sa 2½ is a cleanliness grade (ISO 8501-1); surface profile is assessed separately under ISO 8503.
What capacities does the Strong Makine hanger shot blasting machine come in?
The AK series spans six models, from a 900 mm to a 2250 mm basket diameter, offering roughly 0.5–7.5 tonnes of hanger capacity. The model is chosen to match part size and line throughput.
People Also Ask – PAA
How does a hanger shot blasting machine work?
Parts are loaded onto a hook-type hanger, taken into an enclosed cabin and rotated on their axis. Turbines throw steel shot at the surface; the abrasive is collected, cleaned and reused through a recovery system.
What determines hanger shot blasting machine price?
Price is driven by basket diameter and hanger capacity, the number and power of turbines, the level of automation, the filter and recovery equipment, and line-integration requirements. Accurate costing follows once the parts and throughput target are defined.
What is an automatic hanger shot blasting machine?
It is a machine where abrasive feeding, collection, separation and recovery run without operator intervention. The operator usually only loads and unloads parts.
What is a Y-type hanger shot blasting machine?
A “Y” type monorail hanger system moves parts continuously between loading and unloading stations. This layout speeds up workflow in serial production.
Author / Source: Prepared by the STR Strong Makine engineering team from field experience in industrial surface preparation. Reference: ISO 8501-1 (surface cleanliness grades).
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