Improved instrument shell machining method

Abstract

The invention discloses an improved instrument shell processing method, which belongs to the technical field of instrument processing treatment and comprises the following steps of (1) cleaning treatment, (2) shot blasting treatment, (3) irradiation treatment, (4) passivation treatment, (5) cleaning treatment and (6) drying treatment. The whole steps of the treatment process are simple, application and popularization are easy, and the treated instrument shell is good in surface comprehensive characteristic and high in corrosion resistance and abrasion resistance.

Description

Technical Field

[0001] The invention belongs to the technical field of instrument processing, and in particular relates to an improved instrument housing processing method. Background Art

[0002] Instrument housings are widely used in the fields of industry, scientific research, and medical treatment. For example, in industrial production, instrument housings are used to protect key equipment such as sensors and measuring instruments to ensure their stable operation; in the field of scientific research, instrument housings are used to protect precision instruments to prevent them from being disturbed and damaged by the external environment; in the medical field, instrument housings are used to protect medical equipment to ensure their accuracy and safety. In order to make the instrument housing have a longer service life and stability, it is necessary to improve the surface properties of the instrument housing, such as corrosion resistance and wear resistance, so as to further enhance the market competitiveness of the instrument housing. The above problems also exist for instrument housings of other products. Summary of the invention

[0003] The purpose of the present invention is to provide an improved instrument housing processing method in view of the existing problems.

[0004] The present invention is achieved through the following technical solutions: An improved instrument housing processing method comprises the following steps: (1) Cleaning: Put the instrument housing into the degreasing liquid and soak it for 10-15 minutes, then take it out, rinse it with deionized water and dry it for later use; (2) Shot peening: The instrument housing treated in step (1) is placed in a shot peening machine for shot peening. After the treatment, the impurities generated by shot peening on the instrument housing are blown away with compressed air and then used for later use. (3) Irradiation treatment: Irradiate the instrument housing after treatment in step (2) and take it out after 35-40 minutes for later use; (4) Passivation treatment: Immerse the instrument housing treated in step (3) in the passivation solution and take it out after passivation treatment for 55 to 70 minutes for later use; (5) Cleaning: Place the instrument housing treated in step (4) into a 2-4% sodium bicarbonate solution for immersion for 2-4 minutes, take it out and rinse it with deionized water before use; (6) Drying treatment: Place the instrument housing treated in step (5) in a drying room, control the temperature in the drying room to 70-80°C, and the relative humidity to 40-45%, and take it out after drying for 3-6 hours.

[0005] Furthermore, the degreasing liquid in step (1) is acetone.

[0006] Furthermore, the shot peening medium used in the shot peening treatment in step (2) is corundum, the particle size of which is 150 mesh, the air flow pressure during sand blasting is 0.55-0.60 MPa, the distance between the nozzle and the workpiece is 90-100 mm, and the sand blasting angle is 90°.

[0007] Furthermore, the irradiation treatment in step (3) is ultraviolet irradiation treatment, during which the irradiation power is controlled to be 1400~1500W.

[0008] Furthermore, the components and their corresponding concentrations in the passivation solution described in step (4) are: nano titanium nitride 25-30 g / L, phytic acid 15-20 g / L, zinc stearate 10-15 g / L, cerium nitrate 5-8 g / L, lanthanum nitrate 2-4 g / L, boric acid 5-9 g / L, nitric acid 3-6 g / L, nonylphenol polyoxyethylene ether 0.6-0.9 g / L, nanocellulose 3-7 g / L, and the balance is water.

[0009] Furthermore, the components and corresponding concentrations in the passivation solution are: 28 g / L nano-titanium nitride, 17 g / L phytic acid, 13 g / L zinc stearate, 7 g / L cerium nitrate, 3 g / L lanthanum nitrate, 8 g / L boric acid, 5 g / L nitric acid, 0.8 g / L nonylphenol polyoxyethylene ether, 6 g / L nanocellulose, and the balance is water.

[0010] Furthermore, during the passivation treatment in step (4), ultrasonic treatment is continuously performed, and the ultrasonic frequency used is 280-350 kHz.

[0011] Compared with the prior art, the present invention has the following advantages: The present invention performs special processing on the instrument housing, effectively realizing the enhancement of the surface performance of the instrument housing, wherein the instrument housing is subjected to surface shot peening treatment, which strengthens its surface tissue strength and improves its machinability, and then is subjected to irradiation treatment, and ultraviolet irradiation is used to enhance the activity of surface groups, which is beneficial to subsequent processing, and then is subjected to passivation treatment, and the nano-titanium nitride added in the passivation solution can effectively fill the micropores of the passivation layer, enhance the overall density, and cooperate with the cross-linking of nano-cellulose to enhance the density and anti-seepage performance of the passivation layer, and at the same time, based on the above-mentioned treatment, the cross-linking fixing strength between the passivation film layer and the housing matrix is ​​greatly improved, thereby enhancing the surface characteristics of the instrument housing. The overall steps of the treatment process of the present invention are simple, and it is easy to promote and apply, and the surface comprehensive characteristics of the treated instrument housing are good, and the corrosion resistance and wear resistance are strong, which is of great value for promotion and application. DETAILED DESCRIPTION Example 1

[0012] An improved instrument housing processing method comprises the following steps: (1) Cleaning: Put the instrument housing into the degreasing liquid and soak it for 10 minutes, then take it out, rinse it with deionized water and dry it for later use; (2) Shot peening: The instrument housing treated in step (1) is placed in a shot peening machine for shot peening. After the treatment, the impurities generated by shot peening on the instrument housing are blown away with compressed air and then used for later use. (3) Irradiation treatment: Irradiate the instrument housing after the treatment in step (2) and take it out after 35 minutes for use; (4) Passivation treatment: Immerse the instrument housing treated in step (3) in the passivation solution and take it out after passivation treatment for 55 minutes for later use; (5) Cleaning: The instrument housing treated in step (4) is placed in a 2% sodium bicarbonate solution and soaked for 2 minutes, then taken out and rinsed with deionized water for later use; (6) Drying treatment: Place the instrument housing treated in step (5) in a drying room, control the temperature in the drying room to 70°C and the relative humidity to 40%, and take it out after drying for 3 hours.

[0013] The degreasing liquid described in step (1) is acetone.

[0014] The shot peening medium used in the shot peening treatment described in step (2) is corundum, and its particle size is 150 mesh. The air flow pressure during the blasting is 0.55 MPa, the distance between the nozzle and the workpiece is 90 mm, and the blasting angle is 90°.

[0015] The irradiation treatment in step (3) is ultraviolet irradiation treatment, during which the irradiation power is controlled to be 1400W.

[0016] The components and their corresponding concentrations in the passivation solution described in step (4) are: 25 g / L nano-titanium nitride, 15 g / L phytic acid, 10 g / L zinc stearate, 5 g / L cerium nitrate, 2 g / L lanthanum nitrate, 5 g / L boric acid, 3 g / L nitric acid, 0.6 g / L nonylphenol polyoxyethylene ether, 3 g / L nanocellulose, and the balance is water.

[0017] During the passivation treatment in step (4), ultrasonic treatment was continuously performed, and the ultrasonic frequency used was 280 kHz. Example 2

[0018] An improved instrument housing processing method comprises the following steps: (1) Cleaning: Put the instrument housing into the degreasing liquid and soak it for 13 minutes, then take it out, rinse it with deionized water and dry it for later use; (2) Shot peening: The instrument housing treated in step (1) is placed in a shot peening machine for shot peening. After the treatment, the impurities generated by shot peening on the instrument housing are blown away with compressed air and then used for later use. (3) Irradiation treatment: Irradiate the instrument housing after treatment in step (2) and take it out after 38 minutes for use; (4) Passivation treatment: Immerse the instrument housing treated in step (3) in the passivation solution and take it out after passivation treatment for 65 minutes for later use; (5) Cleaning: The instrument housing treated in step (4) is placed in a 3% sodium bicarbonate solution and soaked for 3 minutes, then taken out and rinsed with deionized water for later use; (6) Drying treatment: Place the instrument housing treated in step (5) in a drying room, control the temperature in the drying room to 75°C, and the relative humidity to 42%, and take it out after drying for 5 hours.

[0019] The degreasing liquid described in step (1) is acetone.

[0020] The shot peening medium used in the shot peening treatment described in step (2) is corundum, and its particle size is 150 mesh. The air flow pressure during the blasting is 0.58 MPa, the distance between the nozzle and the workpiece is 95 mm, and the blasting angle is 90°.

[0021] The irradiation treatment in step (3) is ultraviolet irradiation treatment, during which the irradiation power is controlled to be 1450W.

[0022] The components and their corresponding concentrations in the passivation solution described in step (4) are: 28 g / L nano-titanium nitride, 17 g / L phytic acid, 13 g / L zinc stearate, 7 g / L cerium nitrate, 3 g / L lanthanum nitrate, 8 g / L boric acid, 5 g / L nitric acid, 0.8 g / L nonylphenol polyoxyethylene ether, 6 g / L nanocellulose, and the balance is water.

[0023] During the passivation treatment in step (4), ultrasonic treatment was continuously performed, and the ultrasonic frequency used was 330 kHz. Example 3

[0024] An improved instrument housing processing method comprises the following steps: (1) Cleaning: Put the instrument housing into the degreasing liquid and soak it for 15 minutes, then take it out, rinse it with deionized water and dry it for later use; (2) Shot peening: The instrument housing treated in step (1) is placed in a shot peening machine for shot peening. After the treatment, the impurities generated by shot peening on the instrument housing are blown away with compressed air and then used for later use. (3) Irradiation treatment: Irradiate the instrument housing after treatment in step (2) and take it out after 40 minutes for later use; (4) Passivation treatment: Immerse the instrument housing treated in step (3) in the passivation solution and take it out for use after passivation treatment for 70 minutes; (5) Cleaning: The instrument housing treated in step (4) is placed in a 4% sodium bicarbonate solution and soaked for 4 minutes, then taken out and rinsed with deionized water for later use; (6) Drying treatment: Place the instrument housing treated in step (5) in a drying room, control the temperature in the drying room to 80°C, and the relative humidity to 45%, and take it out after drying for 6 hours.

[0025] The degreasing liquid described in step (1) is acetone.

[0026] The shot peening medium used in the shot peening treatment described in step (2) is corundum, and its particle size is 150 mesh. The air flow pressure during the blasting is 0.60 MPa, the distance between the nozzle and the workpiece is 100 mm, and the blasting angle is 90°.

[0027] The irradiation treatment in step (3) is ultraviolet irradiation treatment, during which the irradiation power is controlled to be 1500W.

[0028] The components and their corresponding concentrations in the passivation solution described in step (4) are: 30 g / L nano-titanium nitride, 20 g / L phytic acid, 15 g / L zinc stearate, 8 g / L cerium nitrate, 4 g / L lanthanum nitrate, 9 g / L boric acid, 6 g / L nitric acid, 0.9 g / L nonylphenol polyoxyethylene ether, 7 g / L nanocellulose, and the balance is water.

[0029] During the passivation treatment in step (4), ultrasonic treatment was continuously performed, and the ultrasonic frequency used was 350 kHz.

[0030] Comparative Example 1 Compared with Example 2, the comparative example 1 omits the irradiation treatment operation in step (3), and the other method steps are the same.

[0031] Comparative Example 2 Compared with Example 2, the nanocellulose component in the passivation solution is omitted in Comparative Example 2, and other method steps are the same.

[0032] Control group Do not perform any treatment on the instrument housing.

[0033] In order to compare the effects of the present invention, the same batch of instrument housings made of 304 stainless steel were selected as experimental objects, and were treated by the corresponding methods of the above-mentioned embodiment 2, comparative embodiment 1, comparative embodiment 2, and control group, and then the performance of the treated instrument housings was tested. The specific comparative data are shown in Table 1 below: Table 1

[0034] Note: The stress corrosion resistance duration described in Table 1 above is tested in accordance with GB / T17898-1999.

[0035] It can be seen from Table 1 above that the treatment method of the present invention can effectively and significantly improve the comprehensive use characteristics of the surface of the instrument housing, extend its service life and stability, and has great promotion and application value.

Claims

1. An improved instrument housing processing method, characterized in that: The steps include: (1) Cleaning: Put the instrument housing into the degreasing liquid and soak it for 10-15 minutes, then take it out, rinse it with deionized water and dry it for later use; (2) Shot peening: The instrument housing treated in step (1) is placed in a shot peening machine for shot peening. After the treatment, the impurities generated by shot peening on the instrument housing are blown away with compressed air and then used for later use. (3) Irradiation treatment: Irradiate the instrument housing after treatment in step (2) and take it out after 35-40 minutes for later use; (4) Passivation treatment: Immerse the instrument housing treated in step (3) in the passivation solution and take it out after passivation treatment for 55 to 70 minutes for later use; (5) Cleaning: The instrument housing treated in step (4) is placed in a sodium bicarbonate solution with a mass fraction of 2-4% and soaked for 2-4 minutes. After being taken out, it is rinsed with deionized water and then used for later use. (6) Drying treatment: Place the instrument housing treated in step (5) in a drying room, control the temperature in the drying room to 70-80°C, and the relative humidity to 40-45%, and take it out after drying for 3-6 hours.

2. The improved instrument housing processing method according to claim 1 is characterized in that: The degreasing liquid described in step (1) is acetone.

3. The improved instrument housing processing method according to claim 1 is characterized in that: The shot peening medium used in the shot peening treatment described in step (2) is corundum, the particle size of which is 150 mesh, the air flow pressure during sand blasting is 0.55~0.60MPa, the distance between the nozzle and the workpiece is 90~100mm, and the sand blasting angle is 90°.

4. The improved instrument housing processing method according to claim 1 is characterized in that: The irradiation treatment in step (3) is ultraviolet irradiation treatment, during which the irradiation power is controlled to be 1400~1500W.

5. The improved instrument housing processing method according to claim 1, characterized in that: The components and their corresponding concentrations in the passivation solution described in step (4) are: nano titanium nitride 25-30 g / L, phytic acid 15-20 g / L, zinc stearate 10-15 g / L, cerium nitrate 5-8 g / L, lanthanum nitrate 2-4 g / L, boric acid 5-9 g / L, nitric acid 3-6 g / L, nonylphenol polyoxyethylene ether 0.6-0.9 g / L, nanocellulose 3-7 g / L, and the balance is water.

6. The improved instrument housing processing method according to claim 5, characterized in that: The components and corresponding concentrations in the passivation solution are: 28 g / L nano titanium nitride, 17 g / L phytic acid, 13 g / L zinc stearate, 7 g / L cerium nitrate, 3 g / L lanthanum nitrate, 8 g / L boric acid, 5 g / L nitric acid, 0.8 g / L nonylphenol polyoxyethylene ether, 6 g / L nano cellulose, and the balance is water.

7. The improved instrument housing processing method according to claim 1 is characterized in that: During the passivation treatment in step (4), ultrasonic treatment is also continuously performed, and the ultrasonic frequency used is 280~350kHz.

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