Sample preparation method for titanium alloy phase transition point testing

Abstract

The sample preparation method for titanium alloy phase transition point test of the present application uses a grinding and polishing machine to process the sample, the grinding and polishing machine includes a clamp, a plurality of mounting holes are arranged on the clamp at intervals, the distance of all the mounting holes from the center of the clamp is equal, and the method comprises: rough machining of a blank sample to form a sample to be processed; preparation of a clamp assembly, wherein an ER chuck suitable for the model of the sample to be processed is selected, the ER chuck is embedded in a fixing piece and then fastened, and the fixing piece is used to load the ER chuck; the sample to be processed is partially embedded in the ER chuck, and the processed length of the sample to be processed is exposed, the fixing piece is installed in the mounting hole; the grinding and polishing machine is started to process the processed length to form a finished product; and the finished product is cleaned and then dried. The efficiency of sample processing is improved.

Description

Technical Field

[0001] This invention belongs to the field of sample processing methods, and particularly relates to a sample preparation method for testing the phase transformation point of titanium alloys. Background Technology

[0002] In the field of physical and chemical testing, it is often necessary to detect the β phase transformation point of titanium alloys. Differential thermal analysis (DTA) is a method that can quickly determine the temperature range of the phase transformation point of titanium alloys and is often used in actual production. However, the accuracy of DTA is affected by the sample preparation effect. In particular, the flatness of the surface of the test sample has a significant impact on the test results. If the flatness of the sample is good, the measured result will be closer to the true value. If the flatness is poor, the measured value will deviate from the true value, thus losing the meaning of the test.

[0003] Due to the limitations of differential thermal analysis equipment, the sample size is usually around φ3mm×2.5mm. Traditional methods make it difficult to grind the test surface of the sample flat. The usual methods are to grind it manually on sandpaper or to use a small clamp to hold the sample and then grind it manually on sandpaper. Because the sample size is small, the samples prepared in this way usually have a certain degree of edge chamfer, which will affect the accuracy of the test results and reduce the sample processing efficiency.

[0004] In view of this, the present invention is hereby proposed. Summary of the Invention

[0005] The purpose of this invention is to provide a sample preparation method for testing the phase transformation point of titanium alloys, at least solving the technical problem of low efficiency in sample processing methods in the prior art. The technical solution of this invention has many beneficial effects, as described below:

[0006] A sample preparation method for testing the phase transformation point of titanium alloys is provided. The sample is processed using a polishing machine, which includes a fixture with a plurality of mounting holes spaced apart. All mounting holes are equidistant from the center of the fixture. The method includes:

[0007] The initial processing of the blank sample forms the sample to be processed;

[0008] The preparation of the clamp assembly includes selecting an ER chuck that matches the model of the sample to be processed, embedding the ER chuck into a fixing member and then fastening it, wherein the fixing member is used to load the ER chuck;

[0009] The sample to be processed is partially embedded in the ER chuck, with the length of the sample to be processed protruding, and the fastener is installed in the mounting hole;

[0010] The grinding and polishing machine is started to process the length to be processed to form a finished product;

[0011] After cleaning the finished product, it is dried.

[0012] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0013] This solution features excellent sample preparation results, high flatness, operability, good repeatability, and cost savings, giving it a significant advantage in China. It can also be widely applied in fields such as aviation, new energy, petroleum, and natural gas, where a large number of refined sample preparation and testing applications are required. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, 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.

[0015] Figure 1 Assembly diagram of the ER clamp of the present invention;

[0016] Figure 2 This is a schematic diagram of the ER chuck of the present invention;

[0017] Figure 3 This is a structural schematic diagram of the fastener;

[0018] Figure 4 This is a top view of the assembly and fixing components in the fixture;

[0019] 1. Fixture; 11. Groove; 2. ER chuck; 3. Fastening rod; 31. Fastener; 4. Bolt; 5. Clamp; 51. Mounting hole. Detailed Implementation

[0020] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0021] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this invention, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0022] The sample preparation method of the present invention for testing the phase transformation point of titanium alloys uses a grinding and polishing machine for sample processing. See [link to relevant documentation]. Figures 1 to 4 The polishing machine includes a clamp 5, on which a plurality of mounting holes 51 are spaced apart, and all mounting holes 51 are equidistant from the center of the clamp 5. The method includes:

[0023] S1: Preliminary processing of the blank sample to form the sample to be processed, specifically:

[0024] Select blank samples according to the technical specifications. The dimensions of the blank samples are φ5mm×40mm.

[0025] The blank sample is machined to φ3mm×10mm on a lathe and cut into samples to be processed with a size of φ3mm×2.5mm. Other sizes can also be cut, φ3mm×10mm, where φ3mm represents the cross-sectional size and 10mm represents the length.

[0026] S2: Preparation of fixture component 5, wherein an ERER chuck 2 compatible with the model of the sample to be processed is selected, and the ERER chuck 2 is embedded into the fixing component 1 and then tightened. The fixing component 1 is used to load the ERER chuck 2. Specifically:

[0027] The fastener 1 is designed with a variable cross-section structure that is open at both ends and gradually expands from the bottom to the top. The inner wall of the fastener 1 is threaded. The ERER chuck 2 is installed in the fastener 1 to ensure that the bottom surface of the ERER chuck 2 is relatively parallel or flat with the bottom surface of the fastener 1.

[0028] The assembled ERER chuck 2 is secured using the fastening rod 3. One end of the fastening rod 3 has a variable cross-section and external threads. Rotating the other end of the fastening rod 3 secures the ERER chuck 2 within the fixing member 1. Figure 2 As shown, the ERER chuck 2 is a product of existing technology and will not be described in detail here.

[0029] like Figure 3As shown, after tightening, the fastening rod 3 is cut at the same height as the top surface of the fastener 1. The fastening rod used to tighten the ERER chuck 2 after cutting is defined as the fastener 31. The end of the fastener 31 is at most flush with the top surface of the fastener 1.

[0030] Furthermore, to avoid material waste, a rotating rod is provided on fastener 31 for easy reuse. Specifically,

[0031] A polygonal groove is formed in the central area of ​​the end face of the fastener 31. One end of a rotating rod of a preset length is fitted with the polygonal groove in an interference fit. The rotating rod drives the fastener 31 to fasten or release the ERER chuck 2 within the fixing member 1.

[0032] The steps described above also include installing the fastener 1 into the mounting hole 51, specifically:

[0033] Select a fastener 1 with a polygonal structure smaller than the mounting hole 51, for example, a nut with a hexagonal variable cross-section structure;

[0034] like Figure 4 As shown, a groove 11 is provided on each side of the fastener 1. The groove 11 extends from the bottom surface of the fastener 1 to a position near the top surface of the fastener 1. The clamp 5 is provided with a fixing hole in the circumferential and radial directions. The fixing hole communicates with the mounting hole 51 and is provided with an internal thread.

[0035] After placing the fastener 1 in the mounting hole 51, select the appropriate bolt 4 and screw it into the fixing hole, and press one end of the bolt 4 against the surface of the groove 11 to fix the fastener 1 in the mounting hole 51, so as to prevent the fastener 1 from shaking or falling off during the polishing process.

[0036] S3: The part of the sample to be processed is embedded in the ERER chuck 2, with the length of the sample to be processed protruding, and the fastener 1 is installed in the mounting hole 51;

[0037] S4: Start the polishing machine to process the length to be processed into a finished product. Specifically:

[0038] Referring to Table 1, six types of sandpaper with progressively increasing precision were used for initial polishing of the sample to be processed. Water was selected as the coolant and lubricant for the polishing machine, and the polishing machine rotated in a forward direction. The parameters of the polishing machine corresponding to each type of sandpaper were preset.

[0039] Polishing of the sample to be processed involves selecting a pre-selected polishing cloth for polishing, and using a polishing machine to mix water and hydrogen peroxide in a pre-selected ratio as the polishing liquid. The purpose of the hydrogen peroxide is to oxidize the surface of the sample to be processed. During the oxidation process, the polishing cloth is continuously used for polishing, thereby improving the polishing degree of the sample to be processed through a chemical reaction.

[0040] The grinding and polishing machine rotates in reverse, and preset parameters are set for the grinding and polishing machine.

[0041]

[0042] Table 1

[0043] The φ3mm×2.5mm sample is carefully held with tweezers and placed into the fixture invented in this method, and then placed into the fixture of the automatic grinding and polishing machine. The fixture is then placed on the automatic grinding and polishing machine and ground and polished according to the titanium alloy sample preparation procedure, as shown in Figure 1.

[0044] S5: After cleaning the finished product, dry it. Specifically, wash the polished sample with clean water before processing.

[0045] Clean the surface of the sample with alcohol and dry it with hot air using a hair dryer.

[0046] The product provided by this invention has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the embodiments above are merely for the purpose of helping to understand the core ideas of this invention. It should be noted that those skilled in the art can make various improvements and modifications to the invention without departing from the principles of the invention, and these improvements and modifications also fall within the protection scope of the invention claims.

Claims

1. A sample preparation method for titanium alloy phase transition point testing, using a grinding and polishing machine to process the sample, the grinding and polishing machine comprising a clamp, characterized in that, The fixture has multiple mounting holes spaced apart, and the center of all the mounting holes is equidistant from the center of the fixture. The method includes: The initial processing of the blank sample forms the sample to be processed; The preparation of the clamp assembly includes selecting an ER chuck that matches the model of the sample to be processed, embedding the ER chuck into a fixing member and then fastening it, wherein the fixing member is used to load the ER chuck; The sample to be processed is partially embedded in the ER chuck, with the length of the sample to be processed protruding, and the fastener is installed in the mounting hole; The grinding and polishing machine is started to process the length to be processed to form a finished product; After cleaning the finished product, it is dried, wherein... The preparation of the clamp assembly includes: the fixing member is configured with a variable cross-section structure that is open at both ends and gradually expands from the bottom surface to the top surface, and the inner wall surface of the fixing member is provided with internal threads; the ER chuck is installed in the fixing member, ensuring that the bottom surface of the ER chuck is relatively parallel or flat with the bottom surface of the fixing member; the assembled ER chuck is fastened with a fastening rod, the first length of one end of the fastening rod is configured with a variable cross-section structure and is provided with external threads, and the other end of the fastening rod is rotated in the fixing member to fasten the ER chuck; after fastening, the fastening rod is cut at the same height as the top surface of the fixing member, and the fixed rod used to fasten the ER chuck after cutting is defined as a fastener, and the end of the fastener is at most flush with the top surface of the fixing member; Installing the fastener in the mounting hole includes: selecting a fastener with a polygonal structure smaller than the mounting hole; creating a groove on each side of the fastener, the groove extending from the bottom surface of the fastener to a position adjacent to the top surface of the fastener; providing a fixing hole in the circumferential and radial directions of the clamp, the fixing hole communicating with the mounting hole and having an internal thread; placing the fastener in the mounting hole, selecting a suitable bolt and screwing it into the fixing hole, and pressing one end of the bolt against the surface of the groove to complete the fixing of the fastener in the mounting hole; The polishing machine is started to process the length to be processed to form a finished product. This includes initial polishing of the sample using sandpaper of six progressively increasing precision grades. Water is used as both a coolant and lubricant in the polishing machine, which rotates in a forward direction. The parameters of the polishing machine corresponding to each precision grade of sandpaper are preset. Polishing of the sample involves selecting a preset polishing cloth and using a preset ratio of water and hydrogen peroxide as the polishing fluid. The polishing machine rotates in a reverse direction, and preset parameters are set for the polishing machine.

2. The production method according to claim 1, characterized by, The initial processing of the blank sample to form the sample to be processed includes: Select blank samples according to the technical specifications. The dimensions of the blank samples are φ5mm×40mm. The blank sample is machined to φ3mm×10mm by a lathe and then cut into samples to be processed with a size of φ3mm×2.5mm.

3. The preparation method according to claim 1, characterized in that, This also includes methods for setting rotating rods on fasteners: A polygonal groove is formed in the central area of ​​the end face of the fastener. One end of a rotating rod of a preset length is interference-fitted with the polygonal groove. Rotating the rotating rod drives the fastener to tighten or release the ER clamp within the fixing member.

4. The method of claim 1, wherein, The process of drying the finished product after cleaning includes: Clean the polished sample with water; Clean the surface of the sample with alcohol and dry it with hot air using a hair dryer.

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