A laser color marking method

Abstract

The application discloses a laser color marking method based on a jig for a laser color marking machine, which comprises a jig base, an upper cover and a light path assembly, the jig base is internally provided with a marking cavity with an upper opening, a plurality of air inlets in communication with the marking cavity are arranged on the peripheral wall of the jig base, the plurality of air inlets are respectively connected to different air sources through air nozzles, an air pressure regulator in communication with the marking cavity is arranged on one side of the jig base, the upper cover is arranged on the jig base, a laser inlet hole is arranged on the upper cover, and the light path assembly is located above the upper cover. The application is mainly used for laser color marking of stainless steel, different colors can be marked in laser processing, the jig simplifies the processing mode and production time of laser color marking of stainless steel, and simultaneously realizes an intelligent process of automatically adjusting the color of laser marking, so that the labor cost is reduced, and the production efficiency is significantly improved.

Description

Technical Field

[0001] This invention relates to the field of laser processing technology, and specifically to a laser color marking method. Background Technology

[0002] Laser marking is a technique that uses the thermal effect of a laser to ablate the surface material of an object, leaving a permanent mark. Laser color marking utilizes the heat of a laser source to produce colored oxides or a colorless, transparent oxide film on the surface of stainless steel. Due to the thin-film interference effect of light, various colors are produced. Compared with ink deposition technology and colored powder film technology, laser color marking technology has significant advantages: 1) it offers durable and indelible color; 2) it is simple and convenient to operate, can mark any pattern, shape, text, etc., and is environmentally friendly and pollution-free.

[0003] Currently, most domestic enterprises achieve different colors by changing the parameters of the laser marking software or adjusting the laser marking focal length when performing laser color marking on stainless steel. The drawback of these two methods is that for each color laser marking on the same piece of stainless steel, the software parameters or laser marking focal length need to be readjusted, resulting in long operation times, high labor costs, and low production efficiency. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a laser color marking method mainly used for laser color marking of stainless steel. Different colors can be marked during laser processing. This fixture simplifies the processing method and production time of laser color marking of stainless steel, and also realizes an intelligent process of automatically adjusting the laser marking color. This not only reduces labor costs, but also significantly improves production efficiency.

[0005] The technical solution of the present invention is as follows:

[0006] A laser color marking method is disclosed, which is based on a fixture for a laser color marking machine. The fixture includes a fixture base, a top cover, and an optical path assembly. The fixture base has a marking chamber with an upper opening. The peripheral wall of the fixture base has several air inlets communicating with the marking chamber. The air inlets are connected to different air sources through air nozzles. An air pressure regulator communicating with the marking chamber is provided on one side of the fixture base. The top cover is placed on the fixture base and has a laser inlet hole. The optical path assembly is located above the top cover. The top cover is provided with a first photoelectric sensor for detecting the presence or absence of material in the marking chamber and a second photoelectric sensor for detecting the gas concentration in the marking chamber.

[0007] The laser color marking method includes the following steps:

[0008] The stainless steel sheet is manually fed into the marking chamber and positioned. The top cover is then closed. The first photoelectric sensor detects that there is material in the marking chamber and sends a signal. The air nozzle releases gas according to the pre-set color to be marked.

[0009] Once the gas reaches a certain concentration, the second photoelectric sensor detects the gas concentration value and determines whether the concentration needs to be increased or decreased.

[0010] If an increase is needed, the air nozzle continues to release gas; if a decrease is needed, the air regulator draws gas from inside the fixture to bring the internal gas concentration to the range required for the marking color.

[0011] Once the gas concentration inside the fixture is detected as OK, the second photoelectric sensor sends a signal again, and the optical path assembly automatically performs laser marking on the stainless steel sheet.

[0012] Furthermore, the top cover is a glass cover.

[0013] Furthermore, a smoking device is provided between the optical path assembly and the top cover.

[0014] Furthermore, the optical path assembly consists of an optical path shaping component, a galvanometer, and a focusing lens.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] (1) The fixture used in the laser color marking machine of the present invention is a closed cavity structure. Various single gases or mixed gases are input through several air inlets. The laser color marking of stainless steel is achieved by changing the gas concentration. The processing method is simple and the production efficiency is high.

[0017] (2) The present invention can automatically detect the presence or absence of material in the fixture. If material is detected in the fixture, a signal is sent, and the required gas is input according to the marking color preset in each gas nozzle, and then laser marking is performed.

[0018] (3) The present invention can automatically detect the gas concentration inside the fixture and provide feedback on the detection value. Based on the gas concentration range required for the set marking color, it can determine whether the gas concentration needs to be increased or decreased, thereby realizing the automatic adjustment of the gas concentration inside the fixture.

[0019] (4) This invention can automatically collect and remove dust, without causing environmental pollution, and achieves green environmental protection. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This invention provides a structural schematic diagram of a fixture for a laser color marking machine;

[0022] Figure 2 This is a schematic diagram of the structure of the fixture base described in this invention. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0024] To illustrate the technical solution described in this invention, specific embodiments are described below. Example

[0025] Please see Figure 1 , Figure 2This embodiment provides a laser color marking method, mainly used for laser color marking of stainless steel. It is based on a laser color marking machine fixture, which includes a fixture base 1, a top cover 2, and an optical path assembly 3. The fixture base 1 has a marking chamber with an upper opening, which can hold stainless steel sheets and positioning stainless steel sheets 20. The peripheral wall of the fixture base 1 has several air inlets communicating with the marking chamber. In this embodiment, the peripheral wall of the fixture base 1 has a first air inlet, a second air inlet, and a third air inlet. The first air inlet is connected to an oxygen source through a first nozzle 4, responsible for releasing oxygen; the second air inlet is connected to a nitrogen source through a second nozzle 5, responsible for releasing nitrogen; the third air inlet is connected to a rare gas source through a third nozzle 6, responsible for releasing some rare gases. An air pressure regulator 7 communicating with the marking chamber is provided on one side of the fixture base 1. The gas pressure regulator 7 is used to evacuate the marking chamber and is responsible for adjusting the vacuum level of the marking chamber. The upper cover 2 is placed on the fixture base 1. In this embodiment, it is a glass cover to facilitate observation of the color change process of the stainless steel sheet 20 during the marking process. The upper cover 2 has a laser inlet hole 21 in the middle, which is conducive to the laser entering the marking chamber. The optical path assembly 3 is located above the upper cover 2. It uses a fiber laser and is mainly responsible for laser marking of the stainless steel sheet. The optical path assembly 3 consists of an optical path shaping component 31, a galvanometer 32, and a focusing lens 33. The laser is shaped by the optical path shaping component 31, which increases the diameter of the laser spot from a small divergence angle to a parallel laser beam (or a laser beam with a small divergence angle), which is conducive to laser transmission. The galvanometer control card controls the rotation of the lens inside the galvanometer 32 to change the direction of laser beam transmission. The laser beam is focused by the focusing lens 33 to complete the laser processing.

[0026] Preferably, a first photoelectric sensor 8 is provided on the upper cover 2 to detect whether there is material in the marking chamber. It can automatically detect whether there is material in the fixture. If material is detected in the fixture, a signal is sent, and the required gas is input according to the marking color preset in each air nozzle, and then laser marking is performed.

[0027] Preferably, a second photoelectric sensor 9 is provided on the upper cover 2 for detecting the gas concentration in the marking chamber. It can automatically detect the gas concentration inside the fixture and provide feedback on the detection value. Based on the gas concentration range required for the set marking color, it can determine whether the gas concentration needs to be increased or decreased, thereby realizing automatic adjustment of the gas concentration inside the fixture.

[0028] Preferably, a smoke extraction device 10 is provided between the optical path component 3 and the upper cover 2, which can automatically extract and remove dust, without environmental pollution, and achieve green environmental protection.

[0029] Working process: The stainless steel sheet 20 is manually fed into the marking chamber and positioned. The top cover 2 is then closed. The first photoelectric sensor 8 detects the presence of material in the marking chamber and sends a signal. The air nozzle releases gas according to the pre-set color to be marked. When the gas reaches a certain concentration, the second photoelectric sensor 9 detects the gas concentration value and determines whether the concentration needs to be increased or decreased. If it needs to be increased, the air nozzle continues to release gas. If it needs to be decreased, the air pressure regulator 7 draws gas from inside the fixture to bring the internal gas concentration to the range required for the marking color. When the gas concentration inside the fixture is OK, the second photoelectric sensor 9 sends a signal again, and the optical path assembly 3 automatically performs laser marking on the stainless steel sheet 20.

[0030] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method of laser color marking, characterized by: The laser color marking method is based on a jig for a laser color marking machine, which comprises a jig base, an upper cover and a light path assembly, the jig base is internally provided with a marking chamber with an upper opening, the peripheral wall of the jig base is provided with a plurality of gas inlets communicated with the marking chamber, the plurality of gas inlets are respectively connected with different gas sources through gas nozzles, one side of the jig base is provided with an air pressure regulator communicated with the marking chamber, the upper cover is arranged on the jig base, the upper cover is provided with a laser inlet hole, the light path assembly is located above the upper cover, the upper cover is provided with a first photoelectric sensor for detecting whether there is material in the marking chamber, and the upper cover is provided with a second photoelectric sensor for detecting the gas concentration in the marking chamber; The laser color marking method comprises the following steps: Manually load the stainless steel sheet into the marking chamber, cover the upper cover, the first photoelectric sensor detects that there is material in the marking chamber, sends a signal, and the gas nozzle releases gas according to the pre-set color to be marked; When the gas reaches a certain concentration, the second photoelectric sensor detects the gas concentration value and determines whether the concentration needs to be increased or decreased; If it needs to be increased, the gas nozzle continues to release gas, and if it needs to be reduced, the air pressure regulator sucks the inside of the jig to make the internal gas concentration reach the required concentration value range of the marking color; When the gas concentration in the jig is detected to be OK, the second photoelectric sensor sends a signal again, and the light path assembly automatically performs laser marking on the stainless steel sheet.

2. A method of laser color marking according to claim 1, characterized in that: The upper cover is a glass cover.

3. A method of laser color marking according to claim 1, wherein: A smoke suction device is arranged between the light path assembly and the upper cover.

4. The method of laser color marking according to claim 1, wherein: The light path assembly is composed of a light path shaping component, a galvanometer and a focusing lens.

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