A vacuum defoaming method for workpiece surface
A vacuum defoaming technology on the surface of the workpiece, applied in the direction of foam dispersion/prevention, can solve the problems of difficult air bubbles, large surface tension, thick potting thickness, etc., to improve product surface quality, improve product quality, and ensure sealing effect of effect
Active Publication Date: 2017-06-23
ANHUI RIZEN AUTO PARTS
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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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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 evacuate, and when the vacuum degree in the vacuum chamber 2 reaches the closing set value, turn off 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 ...
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The invention discloses a workpiece surface vacuum defoaming method which comprises the specific steps: (1) putting a workpiece in a vacuum chamber, and connecting the vacuum chamber with a vacuum pump and a high-pressure air injection spray head; (2) opening the vacuum pump to vacuumize, and closing the vacuum pump when the vacuum degree in the vacuum chamber reaches the closing set value; (3) opening the high-pressure air inject spray head to enable high-pressure air to enter the vacuum chamber quickly, breaking bubbles on the surface of the workpiece due to quick change of internal and external pressure difference, meanwhile, enabling the pressure of quickly injected high-pressure air to act on the surfaces of the bubbles to blow the bubbles broken, and closing the high-pressure air injecting spray head when the vacuum degree in the vacuum chamber reaches the opening set value; (4) repeating the step (2) and the step (3) till the bubbles on a colloid on the surface of the workpiece are removed to achieve the vacuum defoaming of the workpiece. The method has the advantages that the product surface quality is improved, and the workpiece sealing effect is ensured.
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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IPC IPC(8): B01D19/02
Inventor 张琦
Owner ANHUI RIZEN AUTO PARTS