Manufacturing method of metal sheet detection sample

Abstract

The invention discloses a manufacturing method of a metal sheet detection sample, which comprises the following specific steps: S101, sampling; s102, leveling is carried out; s103, cleaning is carried out; s104, cold inlaying is carried out; s105, polishing the detection sample wafer on the bottom surface of the blank body to obtain a qualified detection sample; and S106, placing the detection sample on a spectrograph for detection to obtain chemical components. And the cold inlaying adopts self-setting denture base powder and self-setting of denture base resin. According to the method, the metal sheet is thickened through the blank body in a cold inlaying mode, and then grinding and polishing are conducted. Particularly, the denture base resin is adopted to perform cold inlaying on a metal sheet sample, so that the problem that a non-ferrous metal sheet needs to be turned and polished on a lathe is further solved. Meanwhile, the thickness of the blank body is increased, so that a spectrograph can clamp a detection sample more conveniently, and chemical components of the sample are detected by using a photoelectric direct-reading spectrograph.

Description

Technical Field

[0001] The invention relates to the technical field of tooling manufacturing, and more specifically to a method for manufacturing a metal sheet testing sample. Background Art

[0002] Direct reading spectrometer has the advantages of simultaneous analysis of multiple elements, fast, accurate, and simplified analysis process, and is widely used in the chemical composition analysis of metal materials. When using a direct reading spectrometer for spark analysis, sample processing is crucial to spectral analysis, which directly affects the accuracy and precision of the measured analysis results. According to the standards such as HB / Z206 "Sampling Specifications for Spectral Analysis of Steel and High-temperature Alloys" and HB / Z208 "Sampling Specifications for Spectral Analysis of Nonferrous Metal Materials", the sample surface must be prepared before the instrument is analyzed to remove surface defects such as pits, oxide layers, and pollutants that affect the test, so as to achieve flat, clean and suitable roughness test conditions. The analysis surface of ferrous metal (steel) samples is usually manually polished with a special grinding wheel or sandpaper for the spectrometer. The analysis surface of nonferrous metal materials (copper alloys, aluminum alloys, titanium alloys, etc.) samples and their standard samples need to be turned or milled to meet the test conditions.

[0003] The metal thickness of the spectrometer analysis sample recommended by the standard is greater than 3mm. For sheet materials below 3mm, the content of each element can generally only be detected one by one by conventional chemical analysis methods. Conventional chemical analysis methods require many spare reagents, long test cycles, and low detection efficiency. Therefore, more and more users hope to use spectral analysis methods to quickly and accurately analyze the elements of 0.5-3mm metal sheets or strips, especially the demand for rapid component analysis of stainless steel sheets is particularly significant.

[0004] Most of the solutions for preparing chemical samples of thin plate materials that have been made public so far are to design mechanical clamping devices to achieve fixation and clamping during preparation. However, due to the thinness of the sample, the friction during grinding, the metal sparks and grinding heat generated during grinding, the clamping is difficult, the operation is poor, and it is difficult to prepare a flat surface that meets the excitation requirements. At the same time, there are also unsafe factors such as the sample being knocked away and causing mechanical damage during the preparation process. Summary of the invention

[0005] In view of this, the present invention provides a method for preparing a metal thin plate detection sample, which solves the problem that metal thin plates with a thickness of 0.5 to 3 mm cannot be effectively detected using spectral analysis. While ensuring that the sample thickness is increased, it is convenient to perform photometric processing on the metal thin plate detection surface, thereby improving the detection efficiency of the metal thin plate and the effectiveness of the detection results.

[0006] A method for preparing a metal sheet test sample, characterized in that the specific steps are as follows:

[0007] S101, sampling: cutting the metal sheet to be tested to obtain a blank of a size suitable for the spectrometer to detect;

[0008] S102, leveling: using a press to flatten the uneven surface of the blank to obtain a sample to be tested;

[0009] S103, cleaning: cleaning and drying the sample to be tested;

[0010] S104, cold mounting: placing the test sample into a mold for cold mounting, placing the test sample flat on the bottom of the mold, filling the mold with a solidifiable resin material, and demolding after the resin material solidifies to obtain an embryonic body with the test sample mounted on the bottom;

[0011] S105, polishing the test sample on the bottom surface of the embryo to obtain a qualified test sample;

[0012] S106, placing the test sample on a spectrometer for testing to obtain the chemical composition.

[0013] Furthermore, the cold mounting in S104 uses self-curing denture base resin powder and self-curing denture base water in a ratio of 10g:5ml, which are fully stirred, degassed, and blended into a paste, and left to stand at room temperature for natural curing for about 8-15 minutes to obtain an embryo.

[0014] Furthermore, in S105, the inspection sample on the bottom surface of the embryo body is polished by turning or milling on a lathe.

[0015] Furthermore, the luminosity of the sample detected in S105 is not less than 1.6 μm.

[0016] Furthermore, the mold used for cold mounting in S104 includes a forming mold with a cylindrical structure, the top of the forming mold is open, and the bottom is flat; the metal sheet is placed flat on the bottom of the forming mold; and the resin material is filled in the forming mold.

[0017] The beneficial effect of the present invention is that the metal sheet is thickened through the embryo by cold embedding, and then polished. In particular, the metal sheet sample is cold embedded by using denture base resin, which further solves the problem that the non-ferrous metal sheet needs to be turned and polished on a lathe. At the same time, the extended embryo thickness makes it easier for the spectrometer to clamp the test sample, and the photoelectric direct reading spectrometer is used to detect its chemical composition. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is the state of the blank of common inlay material during turning process;

[0019] Figure 2This is the state of the denture base resin embryo during turning;

[0020] Figure 3 It is the state of the surface of the metal sheet after turning of the blank body of the common inlay material;

[0021] Figure 4 The state of the surface of the metal sheet after turning of the denture base resin embryo;

[0022] Figure 5 Schematic diagram of the mold structure used for cold mounting;

[0023] Figure 6 It is a schematic diagram of the structure of the test sample formed in the mold;

[0024] Figure 7 A bottom view of the test sample;

[0025] Figure 8 for Figure 7 Structural cross-sectional view of

[0026] Fig. 9 Schematic diagram of placing the mold on a table for batch production of samples;

[0027] Fig.10 Schematic diagram of the detection status of the sample on the spectrometer.

[0028] In the figure: 1. mold assembly; 101. forming mold; 102. placement area; 2. metal sheet; 3. embryo; 4. table; 5. spectrometer clamping mechanism; 6. spectrometer detection table. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0030] Embodiment 1:

[0031] The present invention provides a method for preparing a metal sheet detection sample, and the specific steps are as follows:

[0032] S101, sampling: cutting the metal sheet to be tested to obtain a blank of a size suitable for the spectrometer to detect.

[0033] The shearing tool can be a shearing machine or scissors. The shearing size is sampled according to the size required for spectrometer detection. Generally speaking, the shearing area of ​​the metal sheet is not less than 30x30mm, and each batch is not less than 3 pieces. Remove sharp corners and burrs while shearing.

[0034] S102, leveling: Use a press to flatten the uneven surface of the blank to obtain the sample to be tested.

[0035] Since the metal sheet itself is thin in thickness, after being flattened, it is convenient for subsequent cold mounting and surface grinding operations.

[0036] S103, cleaning: cleaning and drying the sample to be tested.

[0037] The purpose is to remove possible contaminants on the surface, which is beneficial to the accuracy of subsequent testing.

[0038] S104, cold mounting: placing the test sample into a mold for cold mounting, placing the test sample flat on the bottom of the mold, filling the mold with a solidifiable resin material, and demolding after the resin material solidifies to obtain an embryonic body with the test sample mounted on the bottom.

[0039] The mold is a cylindrical part, and the bottom of the mold is horizontal. The size of the test sample is smaller than the size of the bottom of the mold, and the thickness of the embryo is 15-25mm.

[0040] S105, polishing the test sample on the bottom surface of the embryo to obtain a qualified test sample: performing photometric processing on the surface of the test sample located on the bottom surface of the embryo until the test surface of the test sample reaches the photometric required by the spectrometer, and finally obtaining a test sample that can be clamped and tested by the spectrometer.

[0041] Specifically, after the cold mounting in S104, the test sample is located on the bottom surface of the embryo. At this time, the test sample does not have a test surface, and the test sample needs to be polished until the light intensity required by the spectrometer. When the polishing is completed, a qualified test sample with a embryo having a thickness and a test surface that meets the light intensity requirements can be obtained.

[0042] The test sample on the bottom surface of the embryo sample is ground and polished, and the test surface with a light intensity of not less than 1.6μm can be obtained by holding the embryo or lathe processing.

[0043] S106, testing the test sample; placing the test surface downward on a spectrometer to perform spectral analysis to obtain chemical composition.

[0044] Specifically, the test sample is placed on the spectrometer, and the clamping mechanism of the spectrometer presses the test sample down onto the upper surface of the embryo body, so that the lower surface of the test sample, i.e., the test surface of the test sample, fits with the table of the spectrometer, ultimately achieving the purpose of obtaining the chemical composition of the metal sheet through spectrometer analysis.

[0045] The technical solutions in the above embodiments have at least the following technical effects or advantages:

[0046] Since the test sample cut from the metal sheet is inlaid on the lower surface of the resin condensed embryo by cold inlay, and then polished to obtain the test sample that meets the test requirements, the thick test sample is finally clamped on the spectrometer. On the one hand, the test sample obtained by cold inlay is convenient for polishing, avoiding the problem that the metal sheet is too thin to be polished, and on the other hand, it avoids the bending of the metal sheet caused by mechanical clamping. On the basis of the above, the embryo obtained by cold inlay also enables the spectrometer to perform direct spectral analysis on the metal sheet.

[0047] Embodiment 2: Based on Embodiment 1;

[0048] There are two types of resin materials used for cold mounting in S104: one is epoxy resin, which is used to mount black metal thin plate materials. The detection surface of this type of material can obtain the detection light through manual grinding with a grinding wheel or sandpaper. The other is denture base resin, which is used to mount non-ferrous metal thin plate materials. This type of material needs to be turned or milled to obtain the required light for detection.

[0049] It should be noted that for metal sheets made of ferrous metal, epoxy resin can be used as the embryo material, because the ferrous metal sheets can reach the luminosity required for spectrometer detection by manual polishing. However, for metal sheets made of non-ferrous metal, the HB / Z 208 standard stipulates that the preparation of non-ferrous metal material spectral samples requires mechanical processing. Therefore, we conducted a comparative test on the mechanical processing performance of samples inlaid with different cold mounting materials, and selected the denture base resin (also called denture base powder) with better mechanical processing performance and higher safety for the human body as the cold mounting raw material.

[0050] Use self-curing denture base resin powder and self-curing denture base water in a ratio of 10g:5ml, fully stir and exhaust, mix into a paste, let stand at room temperature to naturally solidify for about 8-15 minutes, and finally obtain an embryo with excellent processing performance.

[0051] The technical solutions in the above embodiments have at least the following technical effects or advantages:

[0052] Denture base resin is used as a cold mounting material because of its good machining properties, which is very conducive to the mechanical processing of non-ferrous metal thin plates by turning or milling on a lathe, thereby obtaining samples with qualified surface brightness for inspection.

[0053] Embodiment 3: Based on the embodiment 2, self-curing denture base resin powder and self-curing denture base water are used as the embryo material;

[0054] The test sample of the bottom surface of the S105 embryo body is polished and turned or milled with a clean white steel tool to achieve a polished finish.

[0055] In other words, only when denture base resin is used as a cold mounting material, can the test sample be placed on a lathe for further turning or milling. A comparative test of the processing performance of the test samples obtained with ordinary mounting materials and denture base resin as mounting materials found that: 1. Ordinary mounting materials take a long time to solidify into a blank, about 30 minutes, while denture base resin only takes 12-15 minutes. 2. The blank obtained with ordinary mounting materials is relatively soft and elastic, and it is not easy to tighten the lathe, and there is a risk of it flying off during processing. The blank obtained with denture base resin has moderate hardness and can be tightened securely. 3. Figure 1 and Figure 2 As shown, during turning, the test samples obtained from common inlay materials have continuous and tangled chips. However, during turning, the test samples obtained from denture base resin inlays have broken chips and good processing performance. 4. Common inlay materials are sticky to the tool during turning, and the inlay material is easily attached to the metal sample to contaminate the test surface. Some samples also have local tear defects during processing. During turning, the test samples obtained from denture base resin inlays can keep a clean, flat and pollution-free surface. 5. Figure 3 and Figure 4 As shown, the processing roughness of the specimens inlaid with ordinary inlay materials is slightly higher than that of the specimens inlaid with denture base resin.

[0056] Embodiment 4, based on embodiment 1:

[0057] like Figure 5 As shown, the mold 1 used for cold mounting in S104 includes a forming mold 101, which is a cylindrical structure. The top of the forming mold 101 is open, and the bottom is a plane. The inside of the bottom plane is provided with a placement area 102 for a metal sheet. The metal sheet 2 for detection is placed in the placement area 102.

[0058] like Figure 6 As shown, the material for cold embedding is filled into the forming mold 101 with the metal sheet 2 placed therein, and after solidification to form the embryo 3, the model with the metal sheet 2 is taken out from the forming mold 101 to obtain a test sample with the metal sheet 2 embedded at the lower end of the embryo 3, as shown in FIG. Figure 7 and Figure 8 shown.

[0059] It should be noted that the molding mold 101 is a silicone soft mold, which is not easy to adhere to most materials, so it is more convenient to demold the test sample.

[0060] When in use, the staff first places the metal sheet 2 flat in the placement area 102, then pours the epoxy resin or denture base resin solution into the forming mold 101, and leaves it to stand at room temperature to naturally solidify to form the embryo 3. The metal sheet 2 and the embryo 3 solidify to form the test sample, and finally the test sample is demolded. The present invention uses the mold 1 to assist the cold embedding material to form the embryo 3 to cold embed the metal sheet 2, and can obtain a regular block test sample with moderate thickness and convenient preparation. The embedded test sample is easy to grind manually or machined, so that the metal sheet has a light intensity that meets the test.

[0061] like Fig. 9 As shown, in order to improve the efficiency of making test samples, multiple molds 1 can be placed on the table 4 to simultaneously perform cold embedding of the metal sheet 2.

[0062] like Fig.10 As shown, during the test, the metal sheet 2 at the lower end of the embryo 3 is placed on the spectrometer detection table 6, and then the upper end of the embryo 3 is pressed by the spectrometer clamping mechanism 5, so that the metal sheet 2 can fit the spectrometer detection table 8 while maintaining a state of not being deformed, thereby ensuring the validity of the test results.

[0063] The present invention uses a cold embedding method to thicken the metal sheet through the embryo, and then grinds and polishes it. In particular, the metal sheet sample is cold embedded using denture base resin, which further solves the problem that the non-ferrous metal sheet needs to be turned and polished on a lathe. At the same time, the extended embryo thickness is more convenient for the spectrometer to clamp the test sample, and the photoelectric direct reading spectrometer is used to detect its chemical composition. Taking two metal sheets, 1Cr18Ni9Ti stainless steel sheet and QSn6.5-0.1 copper strip, as examples, as shown in Tables 1 and 2, the test results meet the material standard requirements.

[0064] Table 1 Analysis results of 1Cr18Ni9Ti stainless steel sheet

[0065]

[0066] Table 2 Analysis results of QSn6.5-0.1 copper strip

[0067]

[0068] Note: The laboratory uncertainty is calculated as 5%. En≤1, the comparison result is satisfactory; En>1, the comparison result is unsatisfactory.

Claims

1. A method for preparing a metal sheet test sample, characterized in that: The specific steps are as follows: S101, sampling: cutting the metal sheet to be tested to obtain a blank of a size suitable for the spectrometer to detect; S102, leveling: using a press to flatten the uneven surface of the blank to obtain a sample to be tested; S103, cleaning: cleaning and drying the sample to be tested; S104, cold mounting: placing the test sample into a mold for cold mounting, placing the test sample flat on the bottom of the mold, filling the mold with a solidifiable resin material, and demolding after the resin material solidifies to obtain an embryonic body with the test sample mounted on the bottom; S105, polishing the test sample on the bottom surface of the embryo to obtain a qualified test sample; S106, placing the test sample on a spectrometer for testing to obtain the chemical composition.

2. The method for preparing a metal sheet test sample according to claim 1, characterized in that: In the S104, the cold mounting uses self-curing denture base resin powder and self-curing denture base water in a ratio of 10g:5ml, which are fully stirred, exhausted, and blended into a paste, and left to stand at room temperature for natural curing for about 8-15 minutes to obtain an embryo.

3. The method for preparing a metal sheet test sample according to claim 2, characterized in that: The inspection sample of the bottom surface of the embryo in S105 is polished by turning or milling on a lathe.

4. The method for preparing a metal sheet test sample according to claim 1, characterized in that: The luminosity of the sample detected in S105 is not less than 1.6 μm.

5. The method for preparing a metal sheet test sample according to claim 1, characterized in that: The mold used for cold mounting in S104 includes a cylindrical molding mold with an open top and a flat bottom. The metal sheet is placed flat on the bottom of the molding mold. The resin material is filled in the molding mold.

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