Electrostatic spraying production technology of vehicular steel plate spring paint

Abstract

The invention discloses an electrostatic spraying production technology of vehicular steel plate spring paint. The technology comprises the steps that the paint and a diluent are mixed at a specific weight ratio of 3:1; the prepared paint is sprayed to the surface of a steel plate spring by an electrostatic spraying method, wherein a spraying distance, namely a distance from an injection port of a spray gun to the surface of a steel plate spring piece, is 30-32mm, the spraying speed is 2-2.2m / minute, and an spraying angle between the spray gun and a sprayed spring surface is 45 degrees; and then the sprayed steel plate spring piece is dried, wherein the drying temperature is 25-30 DEG C, and the surface drying time is 4.5-5h. With the adoption of the technology, the film thickness of the automobile steel plate spring after electrostatic spraying and an effect of a salt spray test can meet requirements of an automobile manufacturer, and the salt spray test time reaches above 150h.

Description

technical field [0001] The invention relates to the technical field of paint spraying production technology on the surface of leaf springs for vehicles. Background technique [0002] Leaf springs are the most commonly used and most important elastic components in automobile suspensions. The surface paint spraying of the existing leaf springs for automobiles basically adopts two methods: manual spraying and electrostatic spraying. Due to the presence of concave and convex holes on the surface of the leaf spring after shot blasting, some of which have a diameter of 25 μm, no matter which method is used, even if the thickness of the paint film is measured to be 50 μm after spraying, the actual thickness of the paint film is only 25 μm. Salt spray test Time also can not reach more than 150 hours, does not reach the requirement of 150 hours of salt spray test of automobile factory. The manual spraying method is to dry naturally, although this method has certain advantages in ter...

AI Technical Summary

Problems solved by technology

Due to the presence of concave and convex holes on the surface of the leaf spring after shot blasting, some of which have a diameter of 25 μm, no matter which method is used, even if the thickness of the paint film is measured to be 50 μm after spraying, the actual thickness of the paint film is only 25 μm. Salt spray test The time cannot reach more than 150 hours, which cannot meet the requirements of the 150-hour salt spray test of the automobile factory

The manual spraying method is to dry naturally, although this method has certain advantages in terms of energy consumption (no gas heating and drying) and paint consumption (the cost of manual spraying paint consumption is 75 yuan / ton, and the cost of electrostatic spraying paint 95 yuan / ton), but the natural drying effect is not ideal, and the disadvantages are obvious. First, the spraying is uneven, the surface smoothness is not good, and there are obvious unevenness. Second, the natural drying time of the paint is long, and the production Low efficiency (the production efficiency of electrostatic spraying is 2 to 2.5 times that of manual spraying)

At present, the electrostatic spraying method commonly used by domestic leaf spring manufacturers, because there is no mature production process in the paint spraying production process, the paint salt spray test of the leaf spring products of various enterprises cannot meet the requirements of automobile manufacturers in mass production (generally only samples can meet the requirements of the salt spray test), and individual enterprises even if some products meet the requirements in batches, it is realized on the basis of sacrificing the cost of paint, and the gain outweighs the gain