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Contactless powder coating method for small metal workpiece

A metal workpiece, non-contact technology, applied to the surface coating liquid device, coating, etc., can solve the problems of affecting the anti-corrosion and insulation performance of the workpiece, the low production efficiency of manual coating, and the inability to meet mass production. Achieve the effect of reducing coating cost, high production efficiency and improving coating efficiency

Inactive Publication Date: 2003-12-10
杭州五源科技实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In order to make the surface of small metal workpieces have anti-corrosion and insulation properties, the workpiece needs to be coated. Usually, the workpiece is hung on a hanger, or artificially turned over for coating. The defects are: 1) Due to the existence of the hanger, the workpiece hangs Coating cannot be formed at the point, which affects the anti-corrosion and insulation performance of the workpiece; 2) The production efficiency of manual coating is low, it cannot meet the requirements of mass production, and the production cost is also high; 3) The uniformity of coating thickness is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0006] A bra clasp is a metal trim that has a thermoplastic nylon coating applied to it.

[0007] Workpiece material: galvanized sheet stamping parts, sheet thickness 0.6mm.

[0008] Workpiece specifications: 8-shaped, with a daily output of 500,000 pieces.

[0009] The workpiece size is 200×100×100mm.

[0010] The workpiece weight was 300 mg.

[0011] Powder material: Nylon 11, melting point is 183-191°C, particle size is 200 mesh, color is white (can be dyed).

[0012] 1. Phosphating treatment before painting

[0013] The bra buckle is made of hot-dip galvanized stamping parts, which are automatically lifted and arranged to the stainless steel corrugated track conveyor production line for phosphating treatment before painting.

[0014] 1) Degreasing: Neutral degreasing agent 30g / l, degreasing temperature is 45°C, time is 2 minutes;

[0015] 2) Hot water washing: the temperature is 45°C, and the time is 1 minute;

[0016] 3) Washing: Treat for 1 minute at room temperatu...

Embodiment 2

[0031] Ferrite core non-contact powder coating (thermosetting insulating coating)

[0032] Workpiece: Ferrite core.

[0033] Workpiece specifications: the outer diameter of the ring is 10mm, and the daily output is 600,000 pieces.

[0034] Workpiece weight: 60 grams.

[0035] Powder material: modified epoxy resin powder, particle size is 180 mesh, color is light gray;

[0036] Coating thickness requirement: 100 microns.

[0037] 1. The phosphating treatment before painting is the same as in Example 1.

[0038] 2. The workpiece is automatically lifted and arranged, which is the same as that in Embodiment 1.

[0039] 3. Preheat before painting

[0040] The working temperature of high infrared preheating furnace is 200℃, and the conveying speed is 0.8m / min;

[0041] 4. The workpiece is coated with non-contact powder, the powder is modified epoxy resin powder, and the process is the same as that of Example 1.

[0042] 5. Cold belt conveying high infrared radiation curing

...

Embodiment 3

[0046] Chemical fastener non-contact powder coating (polytetrafluoroethylene anti-corrosion coating)

[0047] Workpiece: Hex head nut.

[0048] Workpiece specification: M6, with a daily output of 500,000 pieces.

[0049] Workpiece weight: 1.9 grams.

[0050] Powder material: low molecular weight polytetrafluoroethylene powder coating, particle size 5 microns, color is white;

[0051] Coating thickness requirement: 100 microns.

[0052] 1. The phosphating treatment before painting is the same as in Example 1.

[0053] 2. The workpiece is automatically lifted and arranged, which is the same as that in Embodiment 1.

[0054] 3. Preheat before painting

[0055] The working temperature of high infrared preheating furnace is 550℃, and the conveying speed is 0.8m / min;

[0056] 4. The workpiece is non-contact powder coating, the powder is low molecular weight polytetrafluoroethylene powder coating, and its process is the same as that of embodiment 1.

[0057] 5. Cold belt conve...

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PUM

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Abstract

The present invention relates to a contact-free powder coating mathod for small metal workpiece. The workpiece coating process is implemented in vibration-type fluidized bed, the fluidized layer is made of high-molecular powder material whose grain size is less than 80 meshes, in the course of that the preheated workpiece is passed through the fluidized layer from top to bottom a high-molecular coating laeyr can be formed on the surface of the workpiece, and the thickness of said coating layer is 100-300 micrometers. Said invention can adopt coloured powder material to implement two-colour coating and obtain colour mark function.

Description

technical field [0001] The invention relates to a heating method for coating organic powder, in particular to a non-contact powder coating method for small metal workpieces. Background technique [0002] In order to make the surface of small metal workpieces have anti-corrosion and insulation properties, the workpiece needs to be coated. Usually, the workpiece is hung on a hanger, or artificially turned over for coating. The defects are: 1) Due to the existence of the hanger, the workpiece hangs 2) The production efficiency of manual coating is low, which cannot meet the requirements of mass production, and the production cost is also high; 3) The uniformity of coating thickness is poor. Contents of the invention [0003] A non-contact powder coating method for small metal workpieces, including workpiece pretreatment, lifting arrangement, workpiece preheating, and coating, characterized in that: workpiece coating is carried out in a vibrating fluidized bed, and the height ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D1/24
Inventor 谢金贵周宏宇王一建张娇霞章意坚林云权
Owner 杭州五源科技实业有限公司
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