Fluorescent penetration detection method for titanium alloy casting

Abstract

The invention relates to a fluorescent penetrant detection method for a titanium alloy casting. The fluorescent penetrant detection method comprises the following steps: step 1, cleaning the titanium alloy casting; 2, the titanium alloy casting cleaned in the step 1 is dried; 3, the titanium alloy casting dried in the step 2 is immersed in fluorescent penetrating fluid and permeates the fluorescent penetrating fluid for a first preset time; (4) the titanium alloy casting permeated in the step (3) is taken out of the fluorescent penetrating fluid and dripped above the penetrating groove of the fluorescent penetrating fluid for a second preset time, and the first preset time is shorter than the second preset time; step 5, removing redundant penetrating fluid from the titanium alloy casting after dripping in the step 4 through water with preset temperature and certain pressure, and then immersing the titanium alloy casting into emulsion for emulsification; and 6, after the titanium alloy casting emulsified in the step 5 is dried, developing detection is conducted. The problem of low detection result accuracy caused by excessive permeation is avoided.

Description

Technical Field

[0001] This application relates to the field of photovoltaic titanium alloy casting production technology, and in particular to a method for fluorescence penetrant detection of titanium alloy castings. Background Technology

[0002] Defects on the surface of investment castings can reduce their service reliability. To ensure that the surface quality of castings meets technical standards, fluorescent penetrant testing is usually used to inspect castings. In fluorescent testing, the fluorescent penetrant is enriched at the defect to achieve visualization. However, traditional testing has problems such as poor consistency of multiple inspections and low detection rate of casting defects.

[0003] Chinese patent CN105717134A discloses a penetrant testing process. The basic procedure includes pre-cleaning; applying penetrant; cleaning excess penetrant; applying developer; and observation and evaluation. The process specifies a temperature range of 15–50°C, a penetration time of at least 10 minutes, and then wiping with a clean, lint-free cloth or paper sprayed with cleaning agent to remove excess penetrant from the surface of the workpiece. However, this process can lead to over-penetration and disruption of the uniformity of the penetrant on the casting surface during wiping, resulting in deviations in the final test results. Therefore, there is an urgent need for a novel fluorescent penetrant testing method for titanium alloy castings to address the problems of poor consistency in fluorescent detection and low detection rate of casting defects in existing technologies. Summary of the Invention

[0004] The purpose of this application is to provide a fluorescent penetrant testing method for titanium alloy castings, which can solve the problem of low accuracy in the current testing of titanium alloy castings.

[0005] The technical solution of this invention is that this application provides a method for fluorescence penetrant testing of titanium alloy castings, comprising the following steps: Step 1: Clean the titanium alloy casting; Step 2: Dry the titanium alloy castings that have been cleaned in Step 1; Step 3: Immerse the dried titanium alloy casting from Step 2 into the fluorescent penetrant and allow it to penetrate for a first preset time. ; Step 4: Remove the titanium alloy casting from the fluorescent penetrant after step 3, and drip it above the penetrant tank for a second preset time. The first preset time Less than the second preset time ; Step 5: Immerse the titanium alloy casting, which has been dripped in Step 4, into the emulsion for emulsification; Step 6: After the titanium alloy casting that has completed emulsification in Step 5 is dried, it is subjected to development and inspection.

[0006] Preferably, the first preset time and the second preset time The ratio is 1-2 : 3-4.

[0007] Preferably, the first preset time and the second preset time The ratio is 2:3.

[0008] Preferably, the first preset time The second preset time is 8 minutes. It takes 12 minutes.

[0009] Preferably, the emulsification in step 5 includes a first emulsification stage and a second emulsification stage. In the first emulsification stage, the titanium alloy casting is completely immersed in the emulsion and immersed in the emulsion for a third preset time. In the second emulsification stage, the titanium alloy casting is subjected to a fourth preset time. The third preset time is used to gradually and completely detach the device from the emulsion after it has been fully immersed in it. Less than the fourth preset time .

[0010] Preferably, the third preset time and the fourth preset time The ratio is 1:6.

[0011] Preferably, the third preset time The fourth preset time is 15 seconds. It lasts for 90 seconds.

[0012] Preferably, at the fourth preset time Within a certain time period, the titanium alloy casting gradually detaches from the emulsion at a uniform speed.

[0013] Preferably, before immersing the titanium alloy casting in the emulsion after dripping, excess permeate is removed in a liquid at a preset temperature and pressure.

[0014] Compared with the prior art, the advantages of this application are: (1) In this application, the penetration time and the dripping time are matched to ensure the required penetration time and improve the uniformity of the fluorescent liquid on the surface of the casting. At the same time, the optimal penetration and dripping time are obtained through a large number of experiments, which reduces the situation where the true state of the workpiece cannot be accurately judged due to excessive penetration.

[0015] (2) In this application, the emulsification stage is set as a first emulsification stage and a second emulsification stage. Through a large number of experiments, the required duration of the first emulsification stage and the second emulsification stage is determined to ensure that the surface of the workpiece after emulsification can not only remove excess fluorescent penetrant, but also not affect the detection of fluorescent penetrant in the workpiece. Attached Figure Description

[0016] The present application will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the fluorescence penetrant testing method for titanium alloy castings according to this application; Figure 2 This is a schematic diagram of the test sample in Embodiment 2 of this application. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings. Obviously, the described embodiments are merely one embodiment of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0018] The term "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of this application. In the description of the embodiments of this application, it should be understood that the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," and "third," etc., may explicitly or implicitly include one or more of that feature. Furthermore, the terms "first," "second," and "third," etc., are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Moreover, the terms "comprising" and "being," and any variations thereof, are intended to cover non-exclusive inclusion.

[0019] Example 1: like Figure 1 As shown, this embodiment provides a fluorescent penetrant testing method for titanium alloy castings. This method is implemented using an integrated penetrant testing device, which typically includes a cleaning tank, a penetrant tank, a dripping tank, an emulsification tank, a liquid imaging tank, an observation chamber, a black light lamp, etc. In this embodiment, all steps of the process are completed in the integrated penetrant testing device.

[0020] The fluorescence penetrant testing method for titanium alloy castings includes the following steps: Step 1: Clean the titanium alloy casting; Specifically, the titanium alloy casting is placed in an ultrasonic cleaning machine to clean the workpiece. In some embodiments, the ultrasonic cleaning tank has a power of 6KW, a tank temperature of 50℃, an ultrasonic frequency of 25KHz, and a cleaning time of 30min.

[0021] Step 2: Dry the titanium alloy castings that have been cleaned in Step 1; During the cleaning process, the surface of the titanium alloy casting needs to be dried to remove the attached moisture in order to allow for penetration in the next step. Drying can be done naturally or by using a drying device. In this embodiment, a drying device is used to quickly dry the titanium alloy casting so that it is no longer attached with moisture. In some implementations, the drying temperature can be controlled at 80-150°C and the drying time can be controlled at 10-20 minutes.

[0022] Step 3: Immerse the dried titanium alloy casting from Step 2 into the fluorescent penetrant and allow it to penetrate for a first preset time. ; Fluorescent liquid can penetrate into defective areas inside a workpiece, but the entire titanium alloy casting needs to be immersed in the penetration tank containing the fluorescent liquid. Therefore, in this embodiment, the entire titanium alloy casting is immersed in the penetration tank and soaked in the penetration tank for a first preset time. Penetration is an important process in fluorescent penetrant testing, and the duration of penetration often determines the accuracy of the entire test. However, in existing technologies, there is often over-penetration. For example, if the titanium alloy casting is soaked for too long, too much fluorescent liquid is absorbed, resulting in excessive adsorption in some narrow cavities. During the subsequent cleaning process, there is reverse pressure, causing the capillary absorption to expand and penetrate outwards indefinitely. This leads to the inability to accurately determine the true state of the workpiece in subsequent testing processes. Therefore, the penetration time has a significant impact on the accuracy of the test.

[0023] Step 4: Remove the titanium alloy casting from the fluorescent penetrant after step 3, and drip it above the penetrant tank for a second preset time. The first preset time Less than the second preset time ; Specifically, in this embodiment, a dripping process was performed after the penetration was completed. In the prior art, some processes directly emulsify or test the workpiece after penetration in order to improve the detection speed. During this process, the workpiece surface may have different areas with different penetration uniformity, and excess penetrating liquid may also affect the detection results.

[0024] In this embodiment, a drip station is provided in the space above the permeation tank. The titanium alloy casting after permeation is placed at the drip station to allow excess permeation liquid to drip from the surface of the titanium alloy casting into the permeation tank, thereby achieving uniform distribution of the permeation liquid on the surface of the titanium alloy casting.

[0025] To improve detection accuracy, in this embodiment, before immersing the titanium alloy casting in the emulsion after dripping, excess penetrating liquid is removed in a liquid at a preset temperature and pressure. For example, the workpiece is immersed in water at a certain pressure and temperature, and the excess penetrating liquid inside the workpiece can be removed by gradually increasing the pressure in the water.

[0026] To ensure more uniform dispersion of the permeate, this embodiment precisely controls the dripping time and permeation duration. With drip duration There is a corresponding relationship, and after the applicant's long-term experiments, usually... : =1-2:3-4.

[0027] Step 5: Immerse the titanium alloy casting, which has been dripped in Step 4, into the emulsion for emulsification; Specifically, after the penetration and dripping processes are completed, the titanium alloy casting is placed in an emulsification tank containing an emulsifier. The titanium alloy casting, along with the tooling, is immersed in the emulsifier for emulsification. At the same time, an automatic timing device is activated. After the emulsification time is completed, the workpiece is quickly immersed in a stop emulsification tank to separate the excess emulsifier from the workpiece surface, ensuring that the fluorescent liquid in the workpiece defects is not emulsified. The inner and outer surfaces are immersed in the emulsifier solution.

[0028] Further research by the applicant revealed that the emulsification process was divided into two stages. In the first emulsification stage, the titanium alloy casting was completely immersed in the emulsion, and then immersed in the emulsion for a third preset time. In the second emulsification stage, the titanium alloy casting is subjected to a fourth preset time. Gradually detach completely from the emulsion after being fully immersed in it.

[0029] In order to achieve a better emulsification effect, the applicant found that the first emulsification stage took the third preset time. The fourth preset time, which is less than the time required for the second emulsification stage. Afterwards, the effect is better in the development and detection process.

[0030] Step 6: After the titanium alloy casting that has completed emulsification in Step 5 is dried, it is subjected to development and inspection.

[0031] The developing process involves an electrostatic spraying device that sprays developing powder onto the workpiece and an exhaust system with a filter screen. Excess developing powder is adsorbed onto the filter screen. The developing powder is sprayed onto all surfaces of the workpiece using an electrostatic spraying method, with the inner surface sprayed using double 90° nozzles. Simultaneously, excess developing powder dispersed in the air is adsorbed onto the filter screen of the exhaust system by the airflow. The developing time is 10-120 minutes.

[0032] Using the scheme in Example 1, the test results of the fluorescent penetrant testing sensitivity test block show that cracks with a crack length of 0.38mm-0.81mm can be accurately detected.

[0033] Example 2:

[0034] This embodiment provides a method for fluorescence penetrant testing of titanium alloy castings, which includes the following steps: Step 1: Clean the titanium alloy casting; Step 2: Dry the titanium alloy castings that have been cleaned in Step 1; Step 3: Immerse the dried titanium alloy casting from Step 2 into the fluorescent penetrant and allow it to penetrate for a first preset time. , In this embodiment, the applicant has concluded through extensive practice that setting the penetration time to 8 minutes is the optimal penetration duration.

[0035] Step 4: Remove the titanium alloy casting from the fluorescent penetrant after step 3, and drip it above the penetrant tank for a second preset time. The first preset time Less than the second preset time ; In this embodiment, the penetration time With drip duration The ratio is set to 2:3. In some preferred embodiments, the penetration time is 8 minutes and the dripping time is 12 minutes. By precisely controlling the penetration and dripping time within 20 minutes, the fluorescent liquid on the surface of the titanium alloy casting can be more evenly distributed, and in areas where the defects are within reasonable tolerance, there will be no misjudgment caused by over-development.

[0036] Step 5: Immerse the titanium alloy casting, which has been dripped in Step 4, into the emulsion for emulsification; In this embodiment, the emulsification time of 60 seconds is divided into two emulsification stages. In the first emulsification stage, the titanium alloy casting is completely immersed in the emulsion. In the second emulsification stage, the titanium alloy casting gradually detaches from the emulsion after being completely immersed. In this embodiment, a third preset time... Set to 15 seconds, fourth preset time. Set it to 90 seconds.

[0037] Step 6: After the titanium alloy casting that has completed emulsification in Step 5 is dried, it is subjected to development and inspection.

[0038] Using the scheme of this embodiment, and employing TA15 titanium alloy castings from the same batch (containing 20 artificial crack defects of 0.1~0.3mm), the results are shown in the table below:

[0039] After development and testing in the darkroom, the results showed: Defect detection rate: 95% (19 / 20); Background noise level: 18 LU; Repeatability consistency: σ = 0.5% (detection rate of 94% / 95% / 96% in 3 experiments), the test results are attached. Figure 2 As shown.

[0040] Example 3: This embodiment provides a method for fluorescence penetrant testing of titanium alloy castings, which includes the following steps: Step 1: Clean the titanium alloy casting; Step 2: Dry the titanium alloy castings that have been cleaned in Step 1; Step 3: Immerse the dried titanium alloy casting from Step 2 into the fluorescent penetrant and allow it to penetrate for a first preset time. , Step 4: Remove the titanium alloy casting from the fluorescent penetrant after step 3, and drip it above the penetrant tank for a second preset time. The first preset time Less than the second preset time ; In this embodiment, the infiltration time is 10 minutes and the dripping time is 10 minutes.

[0041] Step 5: Immerse the titanium alloy casting, which has been dripped in Step 4, into the emulsion for emulsification; In this embodiment, during the first emulsification stage, a third preset time... Set to 15 seconds, in the second emulsification stage, the fourth preset time. Set it to 90 seconds.

[0042] Step 6: After the titanium alloy casting that has completed emulsification in Step 5 is dried, it is subjected to development and inspection.

[0043] Using the scheme of this embodiment, and employing TA15 titanium alloy castings from the same batch (containing 20 artificial crack defects of 0.1~0.3mm), the results are shown in the table below:

[0044] After development and testing in the darkroom, the results showed: Defect detection rate: 80% (17 / 20); Background noise level: 15 LU (over-emulsification); Repeatability consistency: σ = 6.2% (detection rates of 75% / 82% / 83% in 3 experiments); Problem Analysis: Equal dripping time leads to excessive loss of surface permeate, and micro-defects show discontinuities.

[0045] Example 4: This embodiment provides a method for fluorescence penetrant testing of titanium alloy castings, which includes the following steps: Step 1: Clean the titanium alloy casting; Step 2: Dry the titanium alloy castings that have been cleaned in Step 1; Step 3: Immerse the dried titanium alloy casting from Step 2 into the fluorescent penetrant and allow it to penetrate for a first preset time. , Step 4: Remove the titanium alloy casting from the fluorescent penetrant after step 3, and drip it above the penetrant tank for a second preset time. The first preset time Less than the second preset time ; In this embodiment, the infiltration time is 8 minutes and the dripping time is 12 minutes.

[0046] Step 5: Immerse the titanium alloy casting, which has been dripped in Step 4, into the emulsion for emulsification; In this embodiment, the emulsification time is set to 60 seconds.

[0047] Step 6: After the titanium alloy casting that has completed emulsification in Step 5 is dried, it is subjected to development and inspection.

[0048] Using the scheme of this embodiment, and employing TA15 titanium alloy castings from the same batch (containing 20 artificial crack defects of 0.1~0.3mm), the results are shown in the table below:

[0049] After development and testing in the darkroom, the results showed: Defect detection rate: 85% (17 / 20); Background noise level: 35 LU (surface fluorescence accumulation); Problem analysis: Over-emulsification causes low background fluorescence.

[0050] Example 5: This embodiment provides a method for fluorescence penetrant testing of titanium alloy castings, which includes the following steps: Step 1: Clean the titanium alloy casting; Step 2: Dry the titanium alloy castings that have been cleaned in Step 1; Step 3: Immerse the dried titanium alloy casting from Step 2 into the fluorescent penetrant and allow it to penetrate for a first preset time. , Step 4: Remove the titanium alloy casting from the fluorescent penetrant after step 3, and drip it above the penetrant tank for a second preset time. The first preset time Less than the second preset time ; In this embodiment, the infiltration time is 15 minutes and the dripping time is 5 minutes.

[0051] Step 5: Immerse the titanium alloy casting, which has been dripped in Step 4, into the emulsion for emulsification; In this embodiment, during the first emulsification stage, a third preset time... Set to 15 seconds, in the second emulsification stage, the fourth preset time. Set it to 90 seconds.

[0052] Step 6: After the titanium alloy casting that has completed emulsification in Step 5 is dried, it is subjected to development and inspection.

[0053] Using the scheme of this embodiment, and employing TA15 titanium alloy castings from the same batch (containing 20 artificial crack defects of 0.1~0.3mm), the results are shown in the table below:

[0054] After development and testing in the darkroom, the results showed: Defect detection rate: 70% (14 / 20); Background noise level: 50 LU; Repeatability consistency: σ = 12.1% (detection rate of 65% / 70% / 75% in 3 experiments).

[0055] Problem analysis: Long penetration combined with short dripping leads to excessive penetration of defects.

[0056] The above embodiments are merely illustrative of the technical concept and features of this application, intended to enable those skilled in the art to understand the content of this application and implement it accordingly, and should not be construed as limiting the scope of protection of this application. It is obvious to those skilled in the art that this application is not limited to the details of the above exemplary embodiments, and that this application can be implemented in other specific forms without departing from the spirit or essential characteristics of this application. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this application is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of the equivalents of the claims are intended to be included within this application.

Claims

1. A method for detecting fluorescence penetrant in titanium alloy castings, characterized in that, Includes the following steps: Step 1: Clean the titanium alloy casting; Step 2: Dry the titanium alloy castings that have been cleaned in Step 1; Step 3: Immerse the dried titanium alloy casting from Step 2 into the fluorescent penetrant and allow it to penetrate for a first preset time. ; Step 4: Remove the titanium alloy casting from the fluorescent penetrant after step 3, and drip it above the penetrant tank for a second preset time. The first preset time Less than the second preset time ; Step 5: Immerse the titanium alloy casting, which has been dripped in Step 4, into the emulsion for emulsification; Step 6: After the titanium alloy casting that has completed emulsification in Step 5 is dried, it is subjected to development and inspection.

2. The method for fluorescent penetrant testing of titanium alloy castings according to claim 1, characterized in that, First preset time and the second preset time The ratio is 1-2:3-4.

3. The method for fluorescent penetrant testing of titanium alloy castings according to claim 2, characterized in that, First preset time and the second preset time The ratio is 2:

3.

4. The method for fluorescent penetrant testing of titanium alloy castings according to claim 3, characterized in that, First preset time The second preset time is 8 minutes. It takes 12 minutes.

5. The method for fluorescent penetrant testing of titanium alloy castings according to claim 1, characterized in that, The emulsification in step 5 includes a first emulsification stage and a second emulsification stage. In the first emulsification stage, the titanium alloy casting is completely immersed in the emulsion and immersed in the emulsion for a third preset time. In the second emulsification stage, the titanium alloy casting is subjected to a fourth preset time. The third preset time is used to gradually and completely detach the device from the emulsion after it has been fully immersed in it. Less than the fourth preset time .

6. The method for fluorescent penetrant testing of titanium alloy castings according to claim 5, characterized in that, The third preset time and the fourth preset time The ratio is 1:

6.

7. The method for fluorescent penetrant testing of titanium alloy castings according to claim 6, characterized in that, The third preset time The fourth preset time is 15 seconds. It lasts for 90 seconds.

8. The method for fluorescent penetrant testing of titanium alloy castings according to claim 7, characterized in that, At the fourth preset time Within a certain time period, the titanium alloy casting gradually detaches from the emulsion at a uniform speed.

9. The method for fluorescence penetrant testing of titanium alloy castings according to claim 5, characterized in that, Before immersing the titanium alloy casting into the emulsion after dripping, excess permeate is removed in a liquid at a preset temperature and pressure.

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