Optical metal surface extinction blackening treatment method

Abstract

The invention discloses an optical metal surface extinction blackening treatment method which comprises the following steps: (1) firstly, performing thermal degreasing on a treated workpiece for 1-10 minutes, and cleaning for 2-5 times; (2) the treated workpiece is placed in a blackening pool for blackening treatment, the blackening temperature ranges from 50 DEG C to 200 DEG C, the blackening time ranges from 5 min to 20 min, and the workpiece is cleaned 2-5 times and dried at the temperature of 120 DEG C for 30 min to 90 min; (3) the blackened workpieces are tidily placed on a material disc manually or through a vibration disc or through a mechanical arm; (4) mixing graphene, purified water and silicon dioxide according to the weight ratio of 5: 60: 0.2, grinding in a nano grinder, and filtering by using a filter of 3 microns or less for later use; according to the technical scheme, compared with a comparison file, discoloration and chromatic aberration are thoroughly eliminated; and the outdoor and vehicle specification technical specifications are reached or exceeded.

Description

Technical Field

[0001] The invention relates to the technical field of metal surface matt blackening treatment methods, and in particular to an optical metal surface matt blackening treatment method. Background Art

[0002] Stray light is other non-imaging light that diffuses on the image plane in addition to the imaging light in the optical system. It includes radiation sources from outside the system, internal radiation sources, and non-imaging light energy from the scattering surface. Stray light in the optical system is an important factor affecting the accuracy of the imaging observation of the system. In order to improve the quality of imaging detection, it is necessary to perform surface blackening treatment on some components in the optical path system to suppress the interference of stray light. Blackening the inside of the component is an effective way to eliminate stray light.

[0003] The application number is CN201010524396.1, which discloses a method for treating the surface of optical stainless steel to make it matte and black. The method comprises: treating the workpiece with high-temperature degreasing powder under heating conditions and then rinsing it with water; treating the workpiece in an acid solution containing a corrosion inhibitor at room temperature and then fully rinsing it with water; treating the workpiece in an oxidizing solution under heating conditions and then fully rinsing it with water; treating the workpiece in an acid solution containing a corrosion inhibitor at room temperature until the surface of the workpiece turns light gray and then fully rinsing it with water.

[0004] The above solution can only solve the problem of visible light stray light, but the above technical solution has many technical problems such as color difference, discoloration, inability to resist high-temperature cooking, and inability to meet the technical requirements of laser radar.

[0005] In order to solve the above technical problems, it is urgent to disclose a method for matte blackening treatment of optical metal surfaces. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides a technical solution: a method for treating an optical metal surface by matting and blackening, comprising the following steps:

[0007] (1) Thermally degrease the workpiece for 1-10 minutes and clean it 2-5 times;

[0008] (2) The workpiece is subjected to blackening treatment at a temperature of 50-200 degrees for 5-20 minutes, washed 2-5 times, and dried at a temperature of 120 degrees for 30-90 minutes;

[0009] (3) Place the blackened workpieces neatly on the tray;

[0010] (4) mixing graphene, pure water and silicon dioxide in a weight ratio of (5-6): (60-65): (0.2-0.3) and grinding the mixture in a nano grinder, and filtering the mixture with a filter having a filter diameter of 1-3 μm before use;

[0011] (5) After grinding the ingredients and adding them into the material cup or syringe, use a propeller to feed the materials;

[0012] (6) Printing: Place the arranged workpiece on a printing device with a bottom heating device for preheating at a temperature of 50-150 degrees for 2-20 minutes;

[0013] (7) performing printing;

[0014] (8) Place the printed product in an oven for drying and aging at a temperature of 80-230 degrees for 30-90 minutes;

[0015] (9) Perform visual inspection on the processed workpiece.

[0016] Further, the processed workpiece is thermally degreased for 2-8 minutes and washed with tap water 3-4 times.

[0017] Furthermore, the treated workpiece is placed in a blackening pool for blackening treatment, the blackening temperature of the treated workpiece is 50-150 degrees, the time is 5-15 minutes, it is washed with tap water 2-4 times, and dried at a temperature of 120 degrees for 30-60 minutes.

[0018] Furthermore, in the step (3), the blackened workpieces are neatly placed on a material tray manually or by a vibration plate, or by a robot.

[0019] The advantages of the invention compared with the prior art are:

[0020] Compared with the comparative documents, the present invention adopts the above technical solution to solve the problems of discoloration and color difference, and reaches or exceeds the outdoor and automotive technical specifications.

[0021] The present invention adds graphene, pure water and silicon dioxide to the ingredients, which can make the color difference reach the plastic SOMA standard. However, the mechanical properties and temperature resistance of the product far exceed those of plastic products. The highest temperature resistance can reach 550 degrees Celsius. The application scope is not limited to mobile phone lenses, but can also adapt to laser ranging, automotive lenses, and laser radar operating lenses in special environments with high temperatures.

[0022] The present invention adopts the above technical solution to not only solve the problem of visible light stray light, but also solve various problems existing in the original process such as color difference, discoloration, and inability to resist high-temperature cooking, and has better performance.

[0023] This process can meet the optical performance requirements of different bands. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a comparison chart of process color difference data under visible light conditions. DETAILED DESCRIPTION

[0025] The present invention is described in further detail below.

[0026] The present invention provides a method for treating a metal surface for optical purposes by matting and blackening, comprising the following steps:

[0027] (1) Thermally degrease the workpiece for 1-10 minutes and clean it 2-5 times;

[0028] (2) The workpiece is subjected to blackening treatment at a temperature of 50-200 degrees for 5-20 minutes, washed 2-5 times, and dried at a temperature of 120 degrees for 30-90 minutes;

[0029] (3) Place the blackened workpieces neatly on the tray;

[0030] (4) mixing graphene, pure water and silicon dioxide in a weight ratio of (5-6): (60-65): (0.2-0.3) and grinding the mixture in a nano grinder, and filtering the mixture with a filter having a filter diameter of 1-3 μm before use;

[0031] (5) After grinding the ingredients and adding them into the material cup or syringe, use a propeller to feed the materials;

[0032] (6) Printing: Place the arranged workpiece on a printing device with a bottom heating device for preheating at a temperature of 50-150 degrees for 2-20 minutes;

[0033] (7) performing printing;

[0034] (8) Place the printed product in an oven for drying and aging at a temperature of 80-230 degrees for 30-90 minutes;

[0035] (9) Perform visual inspection on the processed workpiece.

[0036] Embodiment 1:

[0037] (1) Prepare the workpiece to be processed and place it in the degreasing tank for degreasing. The degreasing time is 5 minutes. In order to increase the uniformity of degreasing, shake it evenly every 4 minutes.

[0038] (2) The workpiece to be processed is placed in a blackening tank for blackening treatment. The blackening temperature is 100 degrees and the time is 15 minutes. In order to increase the uniformity of the blackening of the workpiece to be processed, the workpiece to be processed is evenly shaken during the blackening process. During the process, the color of the workpiece will change from white to blue, from blue to gray, from gray to black or completely black. The workpiece to be processed is taken out, washed with tap water for 3 times, and dried at a temperature of 120 degrees for 50 minutes;

[0039] (3) Place the blackened workpieces neatly on the tray using manual labor, a vibrating plate, or a robot;

[0040] (4) Graphene, pure water, and silicon dioxide are mixed in a weight ratio of 5:60:0.2 and ground in a nano-grinder, and filtered with a filter having a filter diameter of 1 μm before use. The above-mentioned raw materials such as graphene and silicon dioxide can increase the high temperature resistance of the processed workpiece, and the maximum temperature resistance can reach 550 degrees Celsius;

[0041] (5) After adding the ground ingredients into the material cup or syringe, use a precision pusher to feed the ingredients;

[0042] (6) Printing: Place the arranged workpiece on a printing device with a bottom heating device for preheating at 100 degrees for 10 minutes;

[0043] (7) Printing is performed using a 100K ultrasonic spraying device at a speed of 2 cm per minute;

[0044] (8) Place the printed product in an oven for drying and aging at a temperature of 150 degrees for 60 minutes;

[0045] (9) The processed workpiece can be subjected to appearance inspection, which includes color difference inspection, VOC volatilization test, hundred-grid test, reflectivity test, gloss test, double 85 high temperature and high humidity test and steam shock test.

[0046] Embodiment 2:

[0047] (1) Prepare the workpiece to be processed and place it in the degreasing tank for degreasing. The degreasing time is 6 minutes. In order to increase the uniformity of degreasing, shake it evenly every 6 minutes.

[0048] (2) The workpiece to be processed is placed in a blackening tank for blackening treatment. The blackening temperature is 110 degrees and the time is 16 minutes. In order to increase the uniformity of the blackening of the workpiece to be processed, the workpiece to be processed is evenly shaken during the blackening process. During the process, the color of the workpiece will change from white to blue, from blue to gray, from gray to black or completely black. The workpiece to be processed is taken out, washed with tap water for 4 times, and dried at a temperature of 120 degrees for 50 minutes;

[0049] (3) Place the blackened workpieces neatly on the tray using manual labor, a vibrating plate, or a robot;

[0050] (4) Graphene, pure water, and silicon dioxide are mixed in a weight ratio of 5:60:0.2 and ground in a nano-grinder, and filtered with a filter having a filter diameter of 1 μm before use. The above-mentioned raw materials such as graphene and silicon dioxide can increase the high temperature resistance of the processed workpiece, and the maximum temperature resistance can reach 550 degrees Celsius;

[0051] (5) After adding the ground ingredients into the material cup or syringe, use a precision pusher to feed the ingredients;

[0052] (6) Printing: Place the arranged workpiece on a printing device with a bottom heating device for preheating at 120 degrees for 10 minutes;

[0053] (7) Printing is performed using a 100K ultrasonic spraying device at a speed of 2 cm per minute;

[0054] (8) Place the printed product in an oven for drying and aging at a temperature of 150 degrees for 60 minutes;

[0055] (9) The processed workpiece can be subjected to appearance inspection, which includes color difference inspection, VOC volatilization test, hundred-grid test, reflectivity test, gloss test, double 85 high temperature and high humidity test and steam shock test.

[0056] Embodiment three:

[0057] (1) Prepare the workpiece to be processed and place it in the degreasing tank for degreasing. The degreasing time is 7 minutes. In order to increase the uniformity of degreasing, shake it evenly every 5 minutes.

[0058] (2) The workpiece to be processed is placed in a blackening tank for blackening treatment. The blackening temperature is 120 degrees and the time is 18 minutes. In order to increase the uniformity of the blackening of the workpiece to be processed, the workpiece to be processed is evenly shaken during the blackening process. During the process, the color of the workpiece will change from white to blue, from blue to gray, from gray to black or completely black. The workpiece to be processed is taken out, washed with tap water for 5 times, and dried at a temperature of 120 degrees for 50 minutes;

[0059] (3) Place the blackened workpieces neatly on the tray using manual labor, a vibrating plate, or a robot;

[0060] (4) Graphene, pure water, and silicon dioxide are mixed in a weight ratio of 5:60:0.2 and ground in a nano-grinder, and filtered with a filter having a filter diameter of 3 before use. The above-mentioned raw materials such as graphene and silicon dioxide can increase the high temperature resistance of the processed workpiece, and the maximum temperature resistance can reach 550 degrees Celsius;

[0061] (5) After adding the ground ingredients into the material cup or syringe, use a precision pusher to feed the ingredients;

[0062] (6) Printing: Place the arranged workpiece on a printing device with a bottom heating device for preheating at 120 degrees for 10 minutes;

[0063] (7) Printing is performed using a 100K ultrasonic spraying device at a speed of 5 cm per minute;

[0064] (8) Place the printed product in an oven for drying and aging at a temperature of 200 degrees for 90 minutes;

[0065] (9) The processed workpiece can be subjected to appearance inspection, which includes color difference inspection, VOC volatilization test, hundred-grid test, reflectivity test, gloss test, double 85 high temperature and high humidity test and steam shock test.

[0066] The present invention adopts the above technical solution to not only solve the problem of visible light stray light, but also solve various problems existing in the original process such as color difference, discoloration, and inability to resist high-temperature cooking, and has better performance.

[0067] As a further elaboration of the present invention, in step (1), the workpiece to be processed is subjected to thermal degreasing for 2-8 minutes and washed with tap water for 3-4 times.

[0068] As a further elaboration of the present invention, in step (2), the blackening temperature of the treated workpiece is 50-150 degrees, the time is 5-15 minutes, it is washed 2-4 times, and dried at a temperature of 120 degrees for 30-60 minutes.

[0069] As a further elaboration of the present invention, the preheating temperature during the printing process in step (6) is 50-120 degrees and the time is 10-20 minutes.

[0070] As a further explanation of the present invention, in step (8), the drying temperature in the oven is 80-200 degrees and the drying time is 60-90 minutes.

[0071] Embodiment 4:

[0072] The printing equipment is a 100K ultrasonic spraying equipment.

[0073] In the specific printing process, the printing equipment uses 100K ultrasonic spray equipment, which steps at a speed of 10cm per minute. The ultrasonic spray equipment has high uniformity when printing raw materials. It atomizes liquid through ultrasonic oscillation, does not require high-pressure air, reduces liquid rebound and splashing, and the raw material utilization rate is more than 4 times that of ordinary air spraying. At the same time, it can achieve high-precision control of the spray flow rate. Compared with traditional spray equipment, it can reduce the waste of spray materials, reduce the cost of raw material use, and ensure the stability of spray quality.

[0074] As a further explanation of the present invention, in step (4), the weight ratio of graphene, pure water and silicon dioxide is 5:60:0.2.

[0075] 1. Comparison table of process color difference data under non-visible light conditions:

[0076] The process color difference data of the processed parts are measured by a colorimeter under non-visible light conditions. The measurement results are shown in the following table:

[0077]

[0078] Among them, L in the L process color difference data comparison table represents the brightness of the color, ranging from 0 to 100, where 0 represents black and 100 represents white.

[0079] a: represents the color difference on the red and green axis, positive values ​​represent red, negative values ​​represent green, and 0 represents neutral color 1.

[0080] b: represents the color difference on the yellow-blue axis. Positive values ​​represent yellow, negative values ​​represent blue, and 0 also represents neutral color.

[0081] From the above table, we can know that when L is 22.89, a is 0.26, and b is -0.15 in the colorimeter, the high temperature resistance can reach 600 degrees Celsius.

[0082] 2. Process color difference data comparison chart under visible light conditions:

[0083] Under visible light conditions, the high temperature resistance performance test of the processed parts with process color difference is carried out.

[0084] The color difference in the table under the above visible light conditions is obtained by visual observation, such as Figure 1 As shown, the high temperature resistance of the black product below can reach 600 degrees Celsius.

[0085] The present invention and its implementation methods are described above, and such description is not restrictive. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design structures and embodiments similar to the technical solution without creativity, which should all fall within the protection scope of the present invention.

Claims

1. A method for treating a metal surface for optical use by blackening the surface, characterized in that: The method comprises the following steps: (1) Thermally degrease the workpiece for 1-10 minutes and clean it 2-5 times; (2) The workpiece is subjected to blackening treatment at a temperature of 50-200 degrees for 5-20 minutes, washed 2-5 times, and dried at a temperature of 120 degrees for 30-90 minutes; (3) Place the blackened workpieces neatly on the tray; (4) mixing graphene, pure water and silicon dioxide in a weight ratio of (5-6): (60-65): (0.2-0.3) and grinding the mixture in a nano grinder, and filtering the mixture with a filter having a filter diameter of 1-3 μm before use; (5) After grinding the ingredients and adding them into the material cup or syringe, use a propeller to feed the materials; (6) Printing: Place the arranged workpiece on a printing device with a bottom heating device for preheating at a temperature of 50-150 degrees for 2-20 minutes; (7) performing printing; (8) Place the printed product in an oven for drying and aging at a temperature of 80-230 degrees for 30-90 minutes; (9) Perform visual inspection on the processed workpiece.

2. The method for treating optical metal surfaces to darken the surfaces according to claim 1, characterized in that: In the step (1), the workpiece is thermally degreased for 2-8 minutes and washed with tap water 3-4 times.

3. The method for treating optical metal surfaces for matte blackening according to claim 1, characterized in that: In the step (2), the workpiece to be treated is placed in a blackening tank for blackening treatment. The blackening temperature of the workpiece to be treated is 50-150 degrees, the time is 5-15 minutes, and the workpiece is washed with tap water 2-4 times and dried at a temperature of 120 degrees for 30-60 minutes.

4. The method for treating optical metal surfaces to darken the surface according to claim 1, characterized in that: In the step (3), the blackened workpieces are neatly placed on a material tray manually, on a vibration plate, or by a robot.

5. The method for treating optical metal surfaces to darken the surface according to claim 1, characterized in that: During the printing process in step (6), the preheating temperature is 50-120 degrees and the time is 10-20 minutes.

6. The method for treating optical metal surfaces to darken the surface according to claim 1, characterized in that: In step (8), the drying temperature in the oven is 80-200 degrees and the drying time is 60-90 minutes.

7. The method for treating optical metal surfaces to darken the surface according to claim 1, characterized in that: The appearance inspection includes color difference inspection, VOC volatility test, hundred grid test, reflectivity test, gloss test, double 85 high temperature and high humidity test and steam shock test.

8. The method for treating optical metal surfaces to darken the surface according to claim 1, characterized in that: In the step (7), the printing device is a 100K ultrasonic spray device, and the printing is carried out at a speed of 1-10 cm per minute using the 100K ultrasonic spray device.

9. The method for treating optical metal surfaces to darken the surface according to claim 1, characterized in that: In the step (4), the weight ratio of graphene, pure water and silicon dioxide is 5:60:0.2.

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