How to choose the right sandblasting machine for products with different materials?

Here is a practical guide for you to choose sandblasting machines according to materials, which can be used directly in the workshop. Without talking about theory, just give a conclusion, and you will choose them at first glance.

First, the core principles (remember these three sentences first)

Small batch → roller sandblasting machine

Fear of collision, precision → manual box/crawler type

The material determines the sand+pressure, and the model depends on the output.

Second, according to the material directly choose sandblasting machine (the most practical)

1. Carbon steel/iron parts (screws, nuts, stamping parts, hardware)

Features: high hardness, not afraid of collision, rust removal and scale removal.

Recommended model

Small pieces and batches: drum sandblasting machine

Large quantity: crawler automatic sandblasting machine

Sand material

Rust removal: brown corundum 46 # ~ 60 #

Pretreatment (electroplating/spraying): white corundum 80#

Pressure: 0.4 ~ 0.6 MPa

Key points: efficiency is preferred and can be rolled.

2. Stainless steel parts (decorative parts, valves, bathrooms, buckles)

Features: matte, uniform, free from impurities and rust.

Recommended model

Small pieces: roller sandblasting machine

Precision/appearance parts: manual box sandblasting machine

Sand material

Standard: glass beads 100 # ~ 150 #

High requirements: ceramic beads

Pressure: 0.3 ~ 0.5 MPa (small, anti-blooming)

Important: Do not use iron-bearing sand, otherwise it will rust.

3. Aluminum alloy/zinc alloy (die-casting small parts, locks, decorative parts)

Features: soft, easy to deform, easy to scratch, high appearance requirements.

Recommended model

Batch: crawler sandblasting machine (no bump)

Precision: manual box type

Sand material

Plastic sand, resin sand, fine glass beads

Pressure: 0.2 ~ 0.4 MPa (low pressure)

Important point: Never use high hardness sand such as emery.

4. Copper/Brass/Bronze (valve, bathroom, electrical terminal)

Features: soft, glossy and even matte.

Recommended model: manual box/small drum

Sand: glass beads 120 # ~ 150 #

Pressure: 0.2 ~ 0.4 MPa

Key points: tap, keep size and appearance.

5. Cast iron/castings (agricultural machinery, pump valves, tool housings)

Features: thick, thick oxide scale, required strength.

Recommended model: drum type/high pressure box type

Sand material: brown corundum, iron sand and steel shot.

Pressure: 0.5 ~ 0.7 MPa

Key points: To remove the scale forcefully.

6. Acrylic, plastic and bakelite (deburring and matte)

Features: extremely soft, easy to touch.

Recommended model: manual box type

Sand: walnut sand and plastic sand.

Pressure: 0.1 ~ 0.3 MPa (ultra-low pressure)

Key points: only light blowing, not hard spraying.

Third, according to the output & shape, choose the model one second.

1. Small pieces, not afraid of collision → roller sandblasting machine

Screws, nuts, gaskets, small iron parts, small stainless steel parts.

2. Appearance parts, fear of bumping → crawler sandblasting machine

Aluminum parts, zinc alloy, bathroom, decorative hardware.

3. Precision, special-shaped, single → manual box sandblasting machine

Moulds, medical instruments, precision parts, samples

4. Oversize parts and plates → High-pressure open/trolley type

Rack, box, large equipment (hardware is generally not needed)

Fourth, the four pits that are most likely to make mistakes

Brown corundum for aluminum parts → direct scrap, deformation and rough surface.

Iron sand for stainless steel → surface iron infiltration, which will rust in the future.

Manual spraying for small parts → high cost, uneven and low efficiency.

The greater the pressure, the better → small parts are deformed, the size is out of tolerance, and the appearance is scrapped

Five, minimalist summary (direct back)

Iron/carbon steel: roller+brown corundum

Stainless steel: roller/box+glass beads

Aluminum/zinc alloy: crawler/box+plastic sand/fine glass beads

Copper parts: box+fine glass beads

Plastic: box+walnut sand/plastic sand