Processing method of local laser blackening for coating metalwork

A processing method and technology for metal parts, applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc., to achieve the effect of suppressing the influence of stray light, accurate laser control, and clear black border

Inactive Publication Date: 2011-11-16
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a processing method for partial laser blackening of coated metal parts, which has simple processing process,

Method used

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  • Processing method of local laser blackening for coating metalwork
  • Processing method of local laser blackening for coating metalwork
  • Processing method of local laser blackening for coating metalwork

Examples

Experimental program
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Example Embodiment

[0019] Example one:

[0020] A processing method for partial laser blackening of a coating cover plate. The processing process is carried out as follows:

[0021] (1) The base material is selected from iron-based Kovar alloy, and the cover plate 1-1 with a length of 15mm and a thickness of 1.5mm with a central opening 2-1 is machined first, such as figure 1 , figure 2 , And then finish turning the welding side 1-4 to 0.2mm;

[0022] (2) The whole cover plate is gold-plated, and the thickness of the gold-plated layer is about 0.8μm;

[0023] (3) Fix the cover plate on the laser processing workbench, and align the area 2-2 that needs to be partially blackened to the laser; use CAD software to draw the shape of the area that needs to be blackened, and choose a wavelength of 1064nm and a spot diameter of 0.05mm Infrared laser, and set other laser parameters, scan twice, the first parameters are: laser energy is 5.2W, scanning line spacing is 0.05mm, defocus is 3mm, laser scanning speed i...

Example Embodiment

[0027] Example two

[0028] The processing steps of this example are roughly the same as the previous examples. The difference is that the base material is stainless steel plate, nickel-plated and polished, and a blackening treatment is used. The parameters during the blackening process are: laser energy 5W, scanning line spacing 0.05 mm, the defocus is 5mm, the laser scanning speed is 20mm / s, the laser frequency is 40000Hz, and the pulse width is 15μs.

[0029] Figure 4 It is the comparison of the reflectivity of the blackened and non-blackened coated steel sheets at different wavelengths.

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Abstract

The invention discloses a processing method of coating metalwork which undergoes local laser blackening processing in the packaging of optical assembly. The method is sequentially carried out by the following steps: coating metalwork preparation--laser processing--cleaning.By means of special physical metallurgy and chemical metallurgy effects formed by high energy laser in a molten pool, a black oxide or intermetallic compound cover layer is directly generated in the molten pool in the presence of air, and the cover layer can be generated by the quenching and phase transition of a base material or by the oxidation of the base material and the coating. The processing method can be utilized to arrange blackening areas according to the internal structure of the assembly. The processing areas are controlled by a computer and the geometric shape is formed at random. The blackening areas can be accurately controlled and normal coating areas are not influenced; in addition, the processing method is easy and flexible to operate, and different reflectivities of different areas on the same part can be controlled.

Description

technical field [0001] The invention relates to a blackening treatment technology on the surface of metal parts, in particular to a processing method for partial laser blackening of coated metal parts, which is especially suitable for the occasions where different parts have different reflectivity requirements for different parts during packaging of optical components. Background technique [0002] With the continuous improvement of the responsivity and detection rate requirements of infrared detectors, the structural design and packaging of the detector components are becoming more and more important. Among them, the design of suppressing stray light is an important link. Stray light is other non-imaging light that diffuses on the image surface in addition to imaging light in the optical system. It includes non-imaging light energy from radiation sources external to the system and internal radiation sources as well as scattering surfaces. The hazard of stray light causes a...

Claims

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Application Information

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IPC IPC(8): C23C8/04C23C8/10
Inventor 莫德锋刘大福
Owner SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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