Automatic Powder Coating Line for DC Motor Housings, 300 parts/hour – Tay Mo Mechanical Co., Ltd.

KIEUAN designed, fabricated, installed and commissioned an automatic electrostatic powder coating line for DC electric motor housings at Tay Mo Mechanical Co., Ltd. (Công ty TNHH Cơ khí Tây Mỗ). Built around a spindle floor conveyor, the line coats up to 300 parts per hour (about 2,250 per shift) with a two-coat system targeting 1,000-hour salt-spray resistance.

Project information

Client	Tay Mo Mechanical Co., Ltd.
Product	DC electric motor housings (Ø 75 mm, 135 mm long)
KIEUAN scope	Design, fabrication, installation, commissioning, technology transfer
Capacity	Up to 300 parts/hour · ~2,250 per shift
Footprint	14 × 4 m
Timeline	2024

Requirements and design approach

Motor housings are small cylindrical parts produced in volume; they need an even coat all round and strong corrosion resistance. KIEUAN proposed a compact layout on a 14 × 4 m footprint:

A 58 m floor conveyor with 290 rotating spindles (200 mm pitch): each housing spins as it passes the booth for full 360° coverage. 1 m/min, adjustable 0.5 – 3 m/min.
An automatic powder booth in 304 stainless steel with 2 automatic guns, two-stage cartridge recovery at 95% efficiency and a powder sieve for reuse.
A 5 m electric curing oven at 180 – 220°C, 36 kW dry heaters and 100 mm rock wool insulation.

Layout of the motor housing powder line
Line layout: 14 × 4 m, 1 m/min, 300 parts/hour

Fabrication and installation

The stainless frames, booth, filter unit and oven were built at KIEUAN's own factory in April – May 2024, then fully assembled and test-run before leaving the fabrication shop. The spindle conveyor is an imported specialist unit.

Line pre-assembled at KIEUAN workshop
Full line pre-assembled at the KIEUAN workshop

Stainless spindle floor conveyor
58 m floor conveyor with 290 rotating spindles

Powder booth and cartridge recovery unit
Booth and cartridge filters, 95% powder recovery

Full-line trial run

In late May 2024 KIEUAN ran the full line: probes on sample parts profiled the oven temperature, conveyor and gun settings were tuned, and coating thickness was measured. Process: loading → spraying → curing → cooling → inspection → unloading. Two coats: primer 40 – 60 µm, topcoat 60 – 80 µm.

Automatic powder guns coating motor housings
2 automatic powder guns

Electric powder curing oven
5 m electric oven, 180 – 220°C

Oven temperature profiling with probes
Temperature profiling with probes on sample parts

Powder-coated motor housings
Coated housings on the conveyor

Coating thickness check on motor housing
Coating thickness check after curing

Handover and production

The line was installed at Tay Mo's factory; KIEUAN trained the operators and transferred the process so the team runs it independently.

Results

Up to 300 parts per hour with just 3 operators per shift.
Even 360° coverage from rotating spindles; 95% overspray recovery.
Estimated two-coat cost of about VND 4,500 per part (powder, power, labour, consumables).