Method for connecting plastic and metal heterostructure
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A technology of heterogeneous structure and connection method, applied in metal processing equipment, welding equipment, laser welding equipment, etc., can solve the problem of difficult to meet the strength and air tightness of plastic/metal heterogeneous sealing structure, and avoid poor interface bonding. , high reliability, increased controllability and flexibility
Inactive Publication Date: 2017-02-15
SHANGHAI AEROSPACE EQUIP MFG GENERAL FACTORY
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[0006] In summary, the traditional cold-pressed viscose and mechanical sandblasting + hot-pressing methods are difficult to meet the strength and airtightness of plastic / metal heterogeneous sealing structures
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Embodiment 1
[0024] Embodiment 1: as figure 1 The shown plastic / metal heterogeneous sealing structure is composed of a metal part 1 and a plastic part 2. The present invention provides a laser-assisted thermocompression joining method for a plastic / metal heterogeneous sealing structure, which includes the following steps:
[0025] S1, such as figure 2 As shown, the laser roughening treatment is carried out on the surface of the metal part 1, and the pulsed laser 3 is used, and under the action of the auxiliary gas 5 ejected from the nozzle 4, the desired part of the metal surface is generated. image 3 Local protrusions and depressions required in 6;
[0026] S2. Laser connection of plastic part 2 and metal part 1, such as Figure 4 As shown, the defocused laser beam 3 penetrates the plastic and reaches the plastic / metal interface, the laser energy is absorbed by the metal at the interface, generates heat, and is conducted from the metal to the plastic through the interface, resulting i...
Embodiment 2
[0030] Embodiment 2: For the plastic / metal heterogeneous sealing structure described in Embodiment 1, the same surface morphology and airtightness testing methods as in Embodiment 1 are used. The base material is aluminum alloy, fiber laser is used, the focus spot diameter is 0.6mm, the laser power is 1500W-3000W, the scanning speed is in the range of 2.4m / m-36m / min, the pulse frequency is 100Hz-1000Hz, and the duty cycle is in the Between 50% and 75%, the auxiliary gas is Ar, the side blowing angle is 20% to 30%, the air flow is 10 to 15L / min, and the number of laser scans is a single time. It can be adjusted between 5μm and 30μm, and the oxide film thickness is 0~10μm. Preferably, the height difference between the bumps and depressions on the metal surface is not less than 15 μm, and the density is not less than 1 / mm 2 .
[0031] For plastic / aluminum alloy laser connection, the plastic substrate is PA, PET and PA6, the fiber laser is used, the focus spot diameter is 0.6mm, t...
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Abstract
The invention provides a method for connecting plastic and a metal heterostructure. The method comprises the following steps that S1, laser roughening treatment is conducted on the surface of a to-be-connected metal part, and local protrusions and dents are generated on the surface of the metal part, so that a metallic oxide layer is formed; S2, the metal part subjected to laser roughening treatment and a to-be-connected plastic part are hot-pressed, so that the metal part and the plastic part are bonded together; and S3, out-of-focus laser beams are adopted to penetrate through the plastic part so as to reach the interface between the plastic part and the metal part, and the portion, at the interface, of the plastic part is partially melted. According to the method for connecting the plastic and the metal heterostructure, operation is easy, the mechanical engaging and chemical bonding degree of the plastic and metal is increased through the required local protrusions and dents formed on the surface of the metal part and partial heating and temperature control of the interface, tight bonding of the plastic and the metal at the interface is facilitated, and the interface bonding strength and airtightness of the plastic and the metal heterostructure are improved accordingly.
Description
technical field [0001] The invention relates to the field of connecting heterogeneous structures, in particular to a method for connecting plastic and metal heterogeneous structures. Background technique [0002] The plastic / metal heterogeneous sealing structure can give full play to the characteristics of plastic and metal, and meet the requirements of strength and sealing. It has been widely used in the valve core sealing structure, fluid Sensor seals, etc. [0003] There are generally two ways to connect plastic and metal parts in the plastic / metal heterogeneous sealing structure: cold pressing adhesive method and hot pressing method. Among them, when the cold-press bonding method is used, the glue needs to be cured at room temperature or high temperature after the glue is completed, and the production efficiency is low. Moreover, the currently available bonding performance is poor, and the glue is prone to breakage during service, so the sealing performance of the pr...
Claims
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Application Information
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