ALUMINUM ALLOY HUB SURFACE TREATMENT PROCESS

Abstract

Disclosed is an aluminum alloy hub surface treatment process. The specific process flow comprises: providing an aluminum alloy hub blank, sanding, polishing, pre-treating, spraying electroplating silver paint, flash-drying, spraying celluloid paint, curing and discharging. The process not only has the mirror effect of electroplated products, but also has many advantages of simplicity, low cost, no heavy metal pollution and the like.

Claims

1. An aluminum alloy hub surface treatment process, comprising: sanding a surface of an aluminum alloy hub using 400-grit, 800-grit, and 1000-grit sand papers sequentially to produce a sanded surface of the aluminum alloy hub, wherein the sanded surface has a roughness between 0.20 m and 0.23 m, manually polishing the sanded surface of the aluminum alloy hub to produce a polished surface having a roughness RA between 0.16 m and 0.17 m, pre-treating the polished surface of the aluminum alloy hub to produce a pre-treated surface of the aluminum alloy hub, spraying (A), using one or more air guns, silver colored paint onto the pre-treated surface of the aluminum alloy hub, wherein the spraying (A) is done under following conditions: the silver colored paint has a viscosity of 14-15 centistokes as measured by a Din-4 cup, a paint throughput of 80-150 CC, an atomization pressure of 2.0-3.5 bar, a sector pressure of 2.0-3.5 bar, and a gun distance of 180-250 mm, curing the surface of the aluminum alloy hub sprayed with the silver colored paint by keeping temperature of the aluminum alloy hub at 150 C. for 10-15 minutes, flash-drying the surface of the aluminum alloy hub sprayed with the silver colored paint, spraying (B), using one or more air guns, celluloid paint onto the flash-dried surface of the aluminum alloy hub, wherein the spraying (B) is done under following conditions: the celluloid paint has a viscosity of 20-21 centistokes as measured by a Din-4 cup, a paint throughput of 80-150 CC, an atomization pressure of 2.0-3.5 bar, a sector pressure of 2.0-3.5 bar, and a gun distance of 180-250 mm, and curing the celluloid paint sprayed onto the flash-dried surface of the aluminum alloy hub by keeping temperature of the aluminum alloy hub at 150 C. for 10-15 minutes.

Description

DETAILED DESCRIPTION OF THE EMBODIMENTS

Embodiment 1

[0012] An aluminum alloy hub surface treatment process comprises the procedures of providing an aluminum alloy hub blank, sanding, polishing, pre-treating, spraying electroplating silver, flash-drying, spraying celluloid paint, and curing.

[0013] The metallic matrix is sanded by adopting 400#, 800# and 1000# sand paper in sequence to guarantee the positive roughness RA at 0.20 m.

[0014] A manual polishing machine is matched with polishing paste for polishing to guarantee the roughness RA at 0.16 m.

[0015] The operation parameters for spraying electroplating silver comprise: 15 (Din-4), paint throughput 100 CC, atomization pressure 3.0 bar, sector pressure 2.5 bar, and gun distance 200 mm; and the flash-drying time is 15 min.

[0016] The operation parameters for spraying celluloid paint comprise: operation viscosity 20 (Din-4 cup), paint throughput 150 CC, atomization pressure 2.8 bar, sector pressure 3.0 bar, and gun distance 200 mm.

[0017] The curing condition comprises: keeping the temperature of the workpiece at 150 C. for 13 min.

Embodiment 2

[0018] An aluminum alloy hub surface treatment process comprises the procedures of providing an aluminum alloy hub blank, sanding, polishing, pre-treating, spraying electroplating silver, flash-drying, spraying celluloid paint, and curing.

[0019] The metallic matrix is sanded by adopting 400#, 800# and 1000# sand paper in sequence to guarantee the positive roughness RA at 0.21 m.

[0020] A manual polishing machine is matched with polishing paste for polishing to guarantee the roughness RA at 0.17 m.

[0021] The operation parameters for spraying electroplating silver comprise: 15 (Din-4), paint throughput 90 CC, atomization pressure 2.8 bar, sector pressure 2.5 bar, and gun distance 200 mm; and the flash-drying time is 15 min.

[0022] The operation parameters for spraying celluloid paint comprise: operation viscosity 20 (Din-4 cup), paint throughput 150 CC, atomization pressure 2.5 bar, sector pressure 2.8 bar, and gun distance 200 mm.

[0023] The curing condition includes: keeping the temperature of the workpiece at 150 C. for 13 min.

Embodiment 3

[0024] An aluminum alloy hub surface treatment process comprises the procedures of providing an aluminum alloy hub blank, sanding, polishing, pre-treating, spraying electroplating silver, flash-drying, spraying celluloid paint, and curing.

[0025] The metallic matrix is sanded by adopting 400#, 800# and 1000# sand paper in sequence to guarantee the positive roughness RA at 0.21 m.

[0026] A manual polishing machine is matched with polishing paste for polishing to guarantee the roughness RA at 0.16 m.

[0027] The operation parameters for spraying electroplating silver comprise: 15 (Din-4), paint throughput 120 CC, atomization pressure 3.0 bar, sector pressure 3.0 bar, and gun distance 200 mm; and the flash-drying time is 15 min.

[0028] The operation parameters for spraying celluloid paint comprise: operation viscosity 20 (Din-4 cup), paint throughput 160 CC, atomization pressure 3.0 bar, sector pressure 3.2 bar, and gun distance 200 mm.