subject: Antirust Coating Technology Of Machinery [print this page] As everyone knows, engineering machinery is an outdoor working machinery, prolonged exposure to outdoor air ( including marine atmosphere, industrial atmosphere, city atmosphere and rural atmosphere ) and different water ( sea water, river water ) and other harsh environment, all under different geographical and environmental corroded in varying degrees, resulting in the mechanical engineering" chronic disease" and" multiple". Engineering machinery coating engineering machinery products manufacturing process is an important link in. Antirust, anticorrosive painting product quality is one of the most important aspects of a comprehensive quality. The appearance quality of products not only reflects the product protection, decoration performance, but also constitutes the product value the important factors.
The 1coating process
The 1.1 surface treatment
The effective removal of the workpiece on the rust, welding slag, oxide skin, eliminating welding stress, increasing the coating and the metal substrate binding force, thus greatly improving the quality of engineering machinery parts rust-proof. Mechanical cleaning standard requirements to ISO8501- 1to 1988Sa2.5. Surface roughness to achieve anti-rust coating thickness of 1 /3. Spray, shot by shot to meet GB6484 requirements. Sheet metal stamping surface treatment known generally by chemical surface treatment. Process for:
The skim, skim, hot water washing, cold washing, acid pickling, water washing to neutralization to cold water and surface adjustment, phosphating, cold water, hot water washing, water washing and drying
The process can also be based on sheet metal stamping oil, rust to make appropriate adjustments, or without pickling process, or without pre degreasing process. While the degreasing and phosphating chemical treatment technology of key procedure, the two processes directly affect the workpiece quality chemical processing and anti-rust coating quality. The process parameters and related auxiliary equipment is also affects the surface quality _ _ factor can not be ignored.
The 1.2coating process
Due to a wide range of engineering machinery, many specifications, the heavy, parts, generally using spraying method for coating. Spraying technology with air spray gun, high pressure airless spray gun, air assisted spray gun and portable electrostatic spray gun. Air spraying efficiency is low ( around 30%), high-pressure airless waste paint, both common features of environmental pollution is more serious, so have been and are being air assisted spray gun and a portable electrostatic spray gun replaced.
2main coating equipment
2.1through type shot blasting chamber
Through type shot blasting chamber by a cleaning chamber body, shot blasting, shot the circulatory system, ventilation dust removal system, bottom base and an electric control system. According to different specifications of the workpiece size ranging from non-standard design, also can choose the shaping equipment.
2.2water rotary spray chamber
Water rotary spray chamber is also called hydraulic spinning type spray painting room. The chamber adopts a laminar gas suppression means to prevent paint mist diffusion, fluid spinning tube filter paint mist, is technically more complete spray chamber.
2.3hot air drying chamber
Drying method for hot air circulation convection, the biggest advantage of uniform baking, especially for large thermal capacity of engineering machinery parts. The heat with steam, electric, light diesel oil, natural gas, liquefied petroleum gas. In the condition permission situation, the priority choice of liquefied petroleum gas. This is a kind of clean and efficient energy, the biggest advantage is that production cost is only35% - 40% of the cost of electricity.
The 2.4 conveyor system
For engineering machinery parts ( structure), using its own electric hoist is a kind of effective choice.
The 3coating material
Engineering machinery coating should have the following characteristics:
In water, oxygen and corrosive medium permeability is minimal; II and substrate adhesion is strong and lasting; and has good rust, decorative performance; it has special properties, such as dielectric, conductive, heat insulation; and has the appropriate coating system. With industrial energy saving and environmental protection needs, in ensuring the performance conditions, paint should also have low temperature fast, environmental protection and energy saving performance of the coating, and is especially suitable for small batch production of construction machinery spare parts and the whole of the painting. At present the domestic engineering machinery used for epoxy ester primer coating, polyurethane topcoat. The former antirust performance is good, the latter has good decorative performance.
4 environmental protection and labor safety and health
