CN106881299A - A kind of cleaning method of metallic article - Google Patents

Abstract

The invention provides a cleaning method for metal products, which is characterized in that the method comprises the steps: (1) washing step, using pure water to spray and clean, and the water temperature is 10°C-55°C; (2) blowing water step, Use compressed air to spray, the air pressure is 0.1MPa-0.3MPa, spray continuously; (3) Drying step, the temperature is 100-120°C. The present invention reduces the amount of water carried by the wheel hub into the front surface of the oven by introducing water blowing equipment, widens the operating window for water washing after pretreatment, reduces the frequency of water washing and water changes, and at the same time reduces the oven baking temperature, shortens the baking time, and reduces energy consumption. Consumption and reduce the workshop floor space.

Description

Method for cleaning metal products

technical field

The invention relates to the field of wheel hub manufacturing, in particular to an aluminum alloy wheel hub coating pretreatment process.

Background technique

The pretreatment process of aluminum alloy wheels is an important part of the painting production process. Its purpose is to remove the oil and scale on the surface of the hub and provide a film layer with good adhesion to the powder. Generally, it needs to go through several processes such as pre-cleaning→degreasing→pickling→passivation→sealing. After the hub is cleaned with liquid medicine and water, it will go through a drying process to make the surface of the hub free of pollutants, so as to ensure excellent adhesion and corrosion resistance between the paint and the aluminum substrate. Drying not only directly affects the coating effect but also consumes a lot of energy. It is of great significance if a new type of drying process can be developed so that it can not only have excellent pretreatment cleaning effect but also save energy.

Contents of the invention

Therefore, the object of the present invention is to provide a fast, low-energy consumption method for drying the surface of aluminum alloy workpieces.

In one aspect of the present invention, there is provided a cleaning method for metal products, characterized in that the method comprises steps: (1) washing step, using pure water to spray and clean, and the water temperature is 10°C-55°C; ( 2) Water blowing step, spraying with compressed air, the air pressure is 0.1MPa-0.3MPa, continuous spraying; (3) Drying step, the temperature is 100-120°C, and the drying time is 2-12 minutes.

In a preferred aspect of the present invention, in step (1), the water temperature of the spray cleaning is 25°C.

In a preferred aspect of the present invention, in step (2), the air pressure is 0.2MPa.

In a preferred aspect of the present invention, in step (2), the water blowing nozzle is made of plastic or stainless steel.

In a preferred aspect of the present invention, in step (3), the drying temperature is 110° C., and the drying time is 4 minutes.

In a preferred aspect of the present invention, said metal product is an aluminum alloy product.

In a preferred aspect of the present invention, said metal product is an aluminum alloy wheel hub.

In other aspects of the present invention, there is also provided a rapid drying process for hub coating pretreatment, which is realized through the following technical solutions: pretreatment→water washing→water blowing→drying. The water washing process is sprayed with pure water at a temperature of 10°C-55°C. The water blowing section is sprayed with compressed air, the air pressure is 0.1MPa-0.3MPa, and sprayed continuously. The water blowing nozzle is preferably made of plastic or stainless steel.

The present invention reduces the amount of water carried by the wheel hub into the front surface of the oven by introducing water blowing equipment, widens the operating window for water washing after pretreatment, reduces the frequency of water washing and water changes, and at the same time can reduce the baking temperature of the oven, shorten the baking time, and reduce energy consumption. Consumption and reduce the workshop floor space.

Description of drawings

Below, describe embodiment of the present invention in detail in conjunction with accompanying drawing, wherein:

Figure 1: Schematic process flow diagram of Embodiment 1-3 of the present invention.

In the figure: 1-washing step; 2-blowing step; 3-drying step.

detailed description

Example 1:

A rapid drying process for wheel hub coating pretreatment, which is realized through the following technical scheme: pretreatment→water washing→water blowing→drying. The water washing process is sprayed with pure water at a temperature of 10°C. The water blowing section is sprayed with compressed air, the air pressure is 0.1MPa, and sprayed continuously. The water blowing nozzle is made of plastic material. The drying temperature is 120°C, which can realize the complete drying of aluminum alloy wheels.

Example 2:

A rapid drying process for wheel hub coating pretreatment, which is realized through the following technical scheme: pretreatment→water washing→water blowing→drying. The water washing process is sprayed with pure water at a temperature of 25°C. The water blowing section is sprayed with compressed air, the air pressure is 0.2MPa, and sprayed continuously. The water blowing nozzle is made of plastic material. The drying temperature is 110°C, which can realize the complete drying of aluminum alloy wheels.

Example 3:

A rapid drying process for wheel hub coating pretreatment, which is realized through the following technical scheme: pretreatment→water washing→water blowing→drying. The water washing process is sprayed with pure water at a temperature of 55°C. The water blowing section is sprayed with compressed air, the air pressure is 0.3MPa, and sprayed continuously. The water blowing nozzle is made of stainless steel. The drying temperature is 100°C, which can realize the complete drying of aluminum alloy wheels.

Claims (7)

1. a kind of cleaning method of metallic article, it is characterised in that described method includes step：(1) water-washing step, using pure Water spray is cleaned, and water temperature is 10 DEG C -55 DEG C；(2) water step is blown, is sprayed using compressed air, air pressure is 0.1MPa- 0.3MPa, continuous spray；(3) baking step, temperature is 100-120 DEG C, and drying time is 2-12 minutes.

2. method according to claim 1, it is characterised in that in step (1), the water temperature of described cleaning showers is 25 ℃。

3. method according to claim 1, it is characterised in that in step (2), described air pressure is 0.2MPa.

4. method according to claim 1, it is characterised in that in step (2), it is described blow sprinkler head for plastics or Stainless steel.

5. method according to claim 1, it is characterised in that in step (3), described drying temperature is 110 DEG C, dries The dry time is 4 minutes.

6. the method according to any one of claim 1-5, it is characterised in that described metallic article is aluminium alloy system Product.

7. method according to claim 6, it is characterised in that described metallic article is aluminium alloy wheel hub.