Professional Zinc Alloy Surface Finishing Solutions

Barrel Polishing

In the specific field of zinc alloy zipper sliders and luggage accessories, pre-plating treatment through Mass Finishing is crucial. If this step is not done properly, subsequent electroplating (whether barrel plating of gold, silver, or rack plating of gunmetal, nickel-free white) will encounter fatal issues such as blistering, pitting, exposure of the base material, and uneven color.

1. Core Overview

1.1 Key Characteristics of Barrel Polishing

• Efficient batch processing for small workpieces • Uniform surface polishing without dead angles • Low cost, high adaptability to soft zinc alloy • Synchronizes degreasing/oxide removal pretreatment

1.2 Application Value

Removes burrs/oxide/die-casting marks, ensures surface roughness (Ra≤0.8μm for pre-plating), improves coating adhesion and reduces electroplating defects.

2. Equipment Selection

2.1 Barrel Polishing Machine (Batch General Use)

• Core Parameters: Polyurethane/rubber barrel; speed 40-50r/min; loading 50%-70% of barrel volume • Application: Batch deburring/brightening of zipper sliders (3-10cm) and small luggage fasteners

2.2 Vibratory Type Polishing Machine (Fine Polishing)

• Core Parameters: Frequency 35-45Hz; amplitude 1-1.5mm; polyurethane/nylon disc • Application: Fine polishing (brightening/edge rounding) of precision parts (Ra≤0.4μm)

3. Key Materials & Ratios

3.1 Polishing Media (Polishing Stones)

• Rough Polishing: Alumina stones (3-8mm), media-to-workpiece ratio 5:1 • Medium Polishing: Ceramic stones (2-5mm), ratio 3:1 • Fine Polishing: Nylon/plastic stones (2-3mm), ratio 3:1

3.2 Auxiliary Materials

• Degreasing Cleaner: Alkaline (pH10-12), dilution 1:20-30, 5%-8% of tank volume • Polishing Additives: Neutral brightener (1:50-80), corrosion inhibitor (1:100-150)

4. Standard Operation Process

5-Step

1.Pretreatment: Sort workpieces, remove large burrs, pre-clean with water 2.Rough Polishing: Barrel machine (45-50r/min), 120-180mins, remove burrs/oxide 3.Medium Polishing: 40-45r/min (barrel) or 35-40Hz (vibratory), 45-90mins, refine surface 4.Fine Polishing: Vibratory machine (40-45Hz), 30-60mins, mirror gloss (Ra≤0.4μm), dry (60-80℃) 5.Post-treatment: Inspect (gloss/flatness/dimension), store in dry sealed container

5. Key Notes

• Safety: Wear gloves/goggles; no operation during equipment running • Material Care: Separate media by type; dilute additives strictly; avoid mixing different workpieces • Effect Guarantee: Control polishing time (avoid over/under polishing); protect soft zinc alloy from high hardness media/high speed

6. Common Problems & Solutions

Uneven polishing/burr residue

Sort workpieces, adjust loading (60%), extend rough polishing

Surface scratches

Replace damaged media, reduce speed/frequency, trim sharp edges

Gray surface/no luster

Reduce degreaser concentration, add brightener, dry timely

Workpiece deformation

Lower speed/frequency, reduce loading (50%), adjust media ratio to 3:1

7. Expert Tips

Adopt multi-barrel parallel operation for batch production to improve efficiency

Regularly clean/screen polishing media; use special-shaped media for complex gaps

Fine-tune additive ratios based on workpiece condition (within recommended range)

Sales products

We maintain the highest quality and standards. Our machines feature high intelligence, innovation and labor-saving performance, and are equipped with cutting-edge technology.

Barrel Type Polishing Machine

Vibrating Type Polishing Machine

Derlin Coniform Shape Fine Polishing Stone

Sound experience

Exquisite design, selected materials

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