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Vacuum defoaming method for surface of workpiece

A vacuum defoaming technology on the surface of a workpiece, which is applied to the device and coating of the surface coating liquid, can solve the problems of difficult air bubbles, thick potting thickness, and large surface tension, so as to improve the surface quality of the product, Guarantee the sealing effect and improve the effect of product quality

Inactive Publication Date: 2015-11-04
ANHUI RIZHENG XINYUAN ELECTRICAL TECH
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Problems solved by technology

The use of traditional vacuum defoaming process has limitations. For workpieces filled with epoxy resin, the viscosity of the resin is relatively high, the surface tension is high, the thickness of the potting is thick, and the air bubbles are not easy to discharge. Not easy to break, gather on the surface of the colloid, that is, gather on the surface of the workpiece, affecting the surface quality and sealing effect of the workpiece

Method used

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  • Vacuum defoaming method for surface of workpiece

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Embodiment Construction

[0022] The specific implementation manner of the present invention will be described in further detail below by describing the best embodiment with reference to the accompanying drawings.

[0023] refer to figure 1 , the workpiece surface vacuum defoaming method, the specific steps are:

[0024] (1) The workpiece 3 is placed in the vacuum chamber 2, and the vacuum chamber 2 is connected with the vacuum pump 4 and the high-pressure air injection nozzle 1;

[0025] (2) Turn on the vacuum pump 4 to vacuumize, and after the vacuum pump 4 reaches the set time, close the vacuum pump 4;

[0026] (3) Open the high-pressure air injection nozzle 1, the high-pressure air quickly enters the vacuum chamber 2, and the bubbles on the surface of the workpiece 3 are broken due to the rapid change of the internal and external pressure difference, and at the same time, the pressure of the rapidly injected high-pressure gas acts on the surface of the bubbles so that the bubbles are blown;

[00...

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Abstract

The invention discloses a vacuum defoaming method for the surface of a workpiece. The vacuum defoaming method includes the specific steps that 1, the workpiece is placed in a vacuum cavity, and the vacuum cavity is connected with a vacuum pump and a high-pressure air injection spray nozzle; 2, the vacuum pump is started to conduct vacuuming, and the vacuum pump is closed after the vacuum pump conducts vacuuming for a set time; 3, the high-pressure air injection spray nozzle is started, and high-pressure air enters the vacuum pump rapidly; bubbles on the surface of the workpiece are broken due to quick changes of the internal and external pressure difference, and meanwhile the pressure of the fast-injected high-pressure air acts on the surfaces of the bubbles so that the bubbles are broken in a blowing manner; and the high-pressure air injection spray nozzle is closed after the air-intake time of the high-pressure air injection spray nozzle reaches the set value; and 4, the step 2 and step 3 are repeated till the bubbles on the surface colloid of the workpiece are removed, and vacuum defoaming of the workpiece is achieved. By means of the vacuum defoaming method, product surface quality can be improved, and the sealing effect of the workpiece is guaranteed.

Description

technical field [0001] The invention relates to a technology for defoaming the surface of a workpiece by colloidal vacuum potting, in particular to a vacuum defoaming method for the surface of the workpiece. Background technique [0002] For electronic devices that need to ensure internal vacuum, the surface of the electronic device is processed by colloidal vacuum potting. Since air bubbles are easy to remain on the surface of the workpiece, it is necessary to remove the air bubbles on the surface of the workpiece. The use of traditional vacuum defoaming process has limitations. For workpieces filled with epoxy resin, the viscosity of the resin is relatively high, the surface tension is high, the thickness of the potting is thick, and the air bubbles are not easy to discharge. It is not easy to break, and gathers on the surface of the colloid, that is, gathers on the surface of the workpiece, affecting the surface quality and sealing effect of the workpiece. Contents of t...

Claims

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Application Information

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IPC IPC(8): B05C11/10
Inventor 张琦
Owner ANHUI RIZHENG XINYUAN ELECTRICAL TECH
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