How to choose suitable sandblasting machinery in hardware factory?

The hardware factory selects the sandblasting machine, and the core determines the direction according to the workpiece size/material, batch size, accuracy/environmental protection and productivity goals, and then matches the abrasive and the air compressor, so that the right one can be selected at one time.

Four-step method for core selection (directly applied)

Determine the equipment type first

Small batch/multi-variety/special-shaped parts (such as screws, molds and hardware): manual suction sandblasting machine (low cost and flexible).

Mass/standard parts (such as hardware fittings and stamping parts): automatic conveyor/rotary disc sandblasting machine (high efficiency and labor saving) is selected.

Heavy/large parts (such as large hardware): choose pressurized sandblasting machine/sandblasting room (strong impact and continuous operation).

Indoor environmental protection strict tube/precision parts: wet sand blasting machine (dust-free, no secondary pollution)

Then adjust the parameters according to the material and target.

Soft (aluminum, copper, precision parts): low pressure 0.3-0.5MPa, with glass beads/fine ceramic sand (120-240 mesh), Ra 0.8-3.2μm, scratch-proof.

Hardness (steel, castings): high pressure 0.6–1.0 MPa, steel sand/brown corundum (20–80 mesh), Ra 3.2–12.5 μ m, fast rust removal.

Surface target: Ra 1.6–3.2 μ m for coating and Ra 0.8–1.6 μ m for electroplating.

Confirm environmental protection and site

Indoor: priority wet type/dry type with high-efficiency dust removal, with dust emission ≤ 10 mg/m.

Outdoor/extensive: dry and open, with mobile dust collector.

Small site: choose desktop/small box type (covering an area of ≤ 2m2).

Matching and budget

Air compressor: suction type with 7.5-11kW (pressure ≥ 0.6mpa); Pressurized type with 15–37kW (pressure ≥0.8MPa)

Budget: about 10,000-30,000 manually; Automatic about 50-150 thousand; The sandblasting room is about 200-1 million.

Recommended Common Configuration of Hardware Factory

form

Core parameter budget of scenario recommendation equipment

Precision hardware/mold manual suction+wet 0.3–0.5 MPa, 120–240 mesh glass beads 10–30,000.

Automatic conveying 0.6-0.8 MPa for mass stamping parts, 50,000-100,000 steel grit of 40-80 mesh.

Heavy hardware pressure sandblasting machine 0.8–1.0 MPa, 20–40 mesh steel grit 80–150,000.

Indoor environmental protection requires 0.4-0.6 MPa high-humidity sandblasting machine and 30,000-60,000 fine ceramic sand.

Key points of pit avoidance

Don't mix abrasives: coarse sand for soft materials is easy to deform, and fine sand for hard materials is inefficient.

Nozzle wear to the original diameter **+25%** must be replaced (affecting uniformity)

Before painting, it should reach Sa2.5 level, and the surface residue should be ≤5 pieces/cm.

Sum up in one sentence

Hardware factory selects sand blasting machinery: small batch manual, large batch automatic, soft material low-pressure fine sand, hard material high-pressure coarse sand, indoor wet selection/dust removal, and then matches the appropriate air compressor, taking into account the effect and cost.