Auxiliary tool for observing metallographic phase of aluminum alloy oxidation film

Abstract

An auxiliary tool for observing the metallographic phase of an aluminum alloy oxidation film comprises an upper clamping plate and a lower clamping plate which are used for clamping an aluminum alloy sample block, and a fastening mechanism which is used for fixing the upper clamping plate and the lower clamping plate in a state of clamping the aluminum alloy sample block, the upper clamping plate and the lower clamping plate are used for clamping the aluminum alloy sample block, the corresponding end faces of the aluminum alloy sample block, the upper clamping plate and the lower clamping plate are flush with each other, and the aluminum alloy sample block is provided with an oxidation film on the aluminum alloy base body. The upper clamping plate and the lower clamping plate are made of high-carbon steel. Therefore, in the grinding process on the abrasive paper or the automatic grinding disc, only after the high-carbon steel on the two sides is ground by a thin layer, the thin layer of the aluminum alloy base body and the thin layer of the oxidation film can be synchronously ground off, and the single-time oxidation film is extremely small in stress. And finally, the oxidation film of the aluminum alloy and the base body of the aluminum alloy are completely stored together for metallographic observation in cooperation with a wet grinding mode.

Description

Technical Field

[0001] The utility model relates to the field of metallographic tooling, in particular to an auxiliary tooling for observing the metallographic phase of an aluminum alloy oxide film. Background Art

[0002] The oxide film of aluminum alloy can effectively protect the aluminum alloy matrix. The oxide film has the characteristics of anti-oxidation, anti-wear, and anti-corrosion, and is often needed to be studied. When making a metallographic sample of the oxide film of aluminum alloy, it is necessary to grind it on sandpaper. Due to the large difference in the properties of the aluminum alloy matrix and the oxide film of aluminum alloy, the oxide film of aluminum alloy is easy to peel off the aluminum alloy matrix, making it difficult to make a perfect metallographic sample. Utility Model Content

[0003] In order to solve the above problems, the purpose of the utility model is to provide an auxiliary tooling for observing the metallographic phase of aluminum alloy oxide film.

[0004] According to the utility model, there is provided an auxiliary tooling for observing the metallographic structure of an aluminum alloy oxide film, comprising: an upper clamping plate and a lower clamping plate for clamping an aluminum alloy sample block, a fastening mechanism for fixing the upper clamping plate and the lower clamping plate in a state of clamping the aluminum alloy sample block, and a cold-mounted substrate for maintaining the upper clamping plate and the lower clamping plate clamping the aluminum alloy sample block so that the corresponding end faces of the aluminum alloy sample, the upper clamping plate and the lower clamping plate are flush, wherein the aluminum alloy sample block is constructed with an oxide film on the aluminum alloy substrate.

[0005] Preferably, the upper clamping plate and the lower clamping plate are made of high carbon steel.

[0006] Preferably, the fastening mechanism comprises: light holes formed in the upper clamping plate and the lower clamping plate, and bolts and nuts corresponding to the light holes.

[0007] Preferably, a light hole is drilled on the upper clamping plate and the lower clamping plate at a predetermined distance from the two side edges, and is tightened using the corresponding left bolt, left nut, and right bolt, right nut.

[0008] Preferably, the aluminum alloy sample is fastened in a manner that it is centered on one side of the upper clamping plate and the lower clamping plate.

[0009] The beneficial effects of the utility model are as follows: the use of auxiliary tooling ensures that during the grinding process on sandpaper or automatic grinding disc, only after a thin layer of high carbon steel is ground on both sides, the aluminum alloy matrix and oxide film will be ground off in a synchronous manner, and the single oxide film is subjected to extremely small stress. Combined with the wet grinding method, the aluminum alloy oxide film and the aluminum alloy matrix are finally completely preserved together for metallographic observation.

[0010] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a top view schematic diagram of the use state of an auxiliary tooling for observing the metallographic structure of an aluminum alloy oxide film.

[0012] Explanation of reference numerals: 1 - aluminum alloy substrate; 2 - oxide film; 3 - upper clamping plate; 4 - lower clamping plate; 5 - right bolt; 6 - right nut; 7 - left bolt; 8 - left nut; 9 - cold inlay substrate; 10 - light hole. Specific embodiments

[0013] The exemplary embodiments of the present utility model will be described in detail below with reference to the accompanying drawings. The exemplary embodiments described below and shown in the drawings are intended to teach the principles of the present utility model, enabling those skilled in the art to implement and use the present utility model in several different environments and for several different applications. Therefore, the protection scope of the present utility model is defined by the appended claims, and the exemplary embodiments are not intended to, and should not be considered as, a restrictive description of the protection scope of the present utility model. Moreover, for ease of description, the dimensions of the various parts shown in the drawings are not necessarily drawn according to the actual proportional relationship. Regarding the orientation description, such as the longitudinal direction corresponding to the longitudinal length of the main body, and the orientation or positional relationship indicated by up, down, left, right, top, bottom, etc., are all based on the orientation or positional relationship shown in the drawings, only for the purpose of facilitating the description of the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present utility model. Unless otherwise specifically stated, the order of the components and the assembly steps and the numerical values set forth in the embodiments do not limit the scope of the present utility model. Moreover, any numerical range stated herein is intended to include all sub - ranges contained therein. The numerical range expressed as "numerical value A~numerical value B" refers to the range including the endpoint numerical values A and B. Those skilled in the art can understand that the terms "first", "second", "step", etc. in the present utility model are only used to distinguish different steps, devices or modules, etc., and neither represent any specific technical meaning nor indicate an inevitable logical sequence between them. For example, step two and step three can be swapped or run in parallel.

[0014] In view of the fact that when grinding a metallographic sample with the aluminum alloy substrate 1 and the oxide film 2 together as an aluminum alloy sample block, the two are prone to peeling from each other. According to the present utility model, an auxiliary tooling is provided. The upper clamping plate 3 and the lower clamping plate 4 are used to clamp the two, so that the surfaces to be ground of the two are flush with the corresponding surfaces of the upper clamping plate 3 and the lower clamping plate 4, and are fixed by the cold inlay substrate, so that the surfaces to be ground can be directly operated on, and the desired metallographic sample can be obtained for observing the metallographic structure of the aluminum alloy oxide film, effectively avoiding the above - mentioned peeling problem.

[0015] More specifically, the auxiliary tooling includes: an upper clamping plate 3 and a lower clamping plate 4 for clamping the aluminum alloy sample, a fastening mechanism for fixing the upper clamping plate 3 and the lower clamping plate 4 in a state of clamping the aluminum alloy sample, and a cold mounting base for maintaining the upper clamping plate 3 and the lower clamping plate 4 clamping the aluminum alloy sample into a state in which the corresponding end faces of the aluminum alloy sample, the upper clamping plate 3 and the lower clamping plate 4 are flush.

[0016] In one embodiment, the method for using the auxiliary tooling includes the following steps.

[0017] Sample preparation: Prepare the aluminum alloy sample with an oxide film 2 on the aluminum alloy substrate 1 to be observed by sawing or wire cutting. The size is generally 10 (±1) mm*10 (±1) mm, which is more suitable for use.

[0018] The upper clamping plate 3 and the lower clamping plate 4 are made of high carbon steel, which has high strength and wear resistance, and the high carbon characteristic has a good self-lubricating effect during friction. The utility model uses commercially available 1070 model high carbon steel. Cut into a 6 (± 1) mm thick plate of 25 (± 1) mm*25 (± 1) mm. Drill a light hole at a predetermined distance of, for example, 5 mm from each of the two edges, and the diameter can be 3-5 mm. Corresponding to the light hole, the bolt and nut are of M3 specification.

[0019] Place the aluminum alloy sample between the upper clamping plate 3 and the lower clamping plate 4, with the metallographic surface to be observed of the aluminum alloy sample aligned with one side of the upper clamping plate 3 and the lower clamping plate 4, and the entire aluminum alloy sample is centered as much as possible on one side of the upper clamping plate 3 and the lower clamping plate 4 (i.e., the side where the metallographic surface to be observed is to be ground).

[0020] Insert the bolts (corresponding to the left bolt 7 and the right bolt 5) into the light hole 10, pre-tighten the nuts (corresponding to the left nut 8 and the right nut 6), and use a torque wrench for formal tightening, with the torque controlled at 250-300N. This is because the bolts have requirements for the tightening force of the upper clamping plate 3 and the lower clamping plate 4. If they are too loose, the clamping force will not be tight, and the aluminum alloy sample with the oxide film 2 will easily move, and pits or scratches will easily appear on the metallographic surface; if they are too tight, the oxide film 2 will easily break directly.

[0021] That is, the combination of the light hole 10, the bolt and the nut is used as the fastening mechanism here, but it is not limited to this, as long as the upper clamping plate 3 and the lower clamping plate 4 can be appropriately fixed in a state of sandwiching the aluminum alloy sample to form a tooling body.

[0022] The aluminum alloy sample and the tooling body are cold mounted together, so as to be retained in the cold mounting base 9, so that the corresponding end faces of the aluminum alloy sample, the upper clamping plate 3 and the lower clamping plate 4 are exposed flush or about to be exposed with a thin layer of thickness, and subsequent grinding, polishing and etching can be performed to form the desired metallographic surface to be observed, and then metallographic observation can be performed. Cold mounting is a conventional material science method and will not be described in detail.

[0023] Preferably, the grinding process is preferably wet grinding. By reducing friction and increasing the grinding time, the damage of the frictional force to the oxide film is further reduced. During the grinding stage, when grinding on artificial sandpaper, after a thin layer of the two-sided high-carbon steel is ground, a thin layer of the aluminum alloy matrix 1 and the oxide film 2 will be ground off synchronously, and the force is very uniform. At the same time, control the small force for grinding (it is difficult for manual operation to judge the specific force value, and it can be practiced according to the feeling and the final result during actual operation), appropriately extend the grinding time (generally, the grinding stage requires 30-60 minutes), and keep the water volume sufficient on the grinding sandpaper without dryness. If an automatic grinding and polishing machine is used for grinding, a small downward pressure must be selected (generally 20-30 N is more appropriate), and the grinding time is appropriately extended (extended by 2-3 times the normal time), and the water flow rate needs to be adjusted to more than 80 ml / s.

[0024] In the description of the present application, the meaning of "a plurality of" is two or more unless otherwise specifically defined. Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances. Although the present invention has been described with reference to various specific embodiments, it should be understood that modifications can be made within the spirit and scope of the described inventive concept. Therefore, it is intended that the present invention is not limited to the described embodiments, but will have the full scope defined by the language of the appended claims.

Claims

1. An auxiliary tool for observing the metallographic structure of aluminum alloy oxide film, characterized in that: include: An upper clamping plate (3) and a lower clamping plate (4) for clamping an aluminum alloy sample block, a fastening mechanism for fixing the upper clamping plate (3) and the lower clamping plate (4) in a state of clamping the aluminum alloy sample, and a cold-mounted substrate for maintaining the upper clamping plate (3) and the lower clamping plate (4) clamping the aluminum alloy sample so that the corresponding end faces of the aluminum alloy sample, the upper clamping plate (3) and the lower clamping plate (4) are flush, wherein the aluminum alloy sample is configured to have an oxide film (2) on the aluminum alloy substrate (1).

2. The auxiliary tooling for observing the metallographic structure of aluminum alloy oxide film according to claim 1, characterized in that: The upper clamping plate (3) and the lower clamping plate (4) are made of high carbon steel.

3. The auxiliary tooling for observing the metallographic structure of aluminum alloy oxide film according to claim 1, characterized in that: The fastening mechanism comprises: light holes formed on the upper clamping plate (3) and the lower clamping plate (4), and bolts and nuts corresponding to the light holes.

4. The auxiliary tooling for observing the metallographic structure of aluminum alloy oxide film according to claim 3, characterized in that: A light hole (10) is drilled on the upper clamping plate (3) and the lower clamping plate (4) at a predetermined distance from the two side edges, and is tightened using the corresponding left bolt (7), left nut (8), and right bolt (5), right nut (6).

5. The auxiliary tooling for observing the metallographic structure of aluminum alloy oxide film according to claim 1, characterized in that: The aluminum alloy sample is fastened in a manner that it is centered on one side of the upper clamping plate (3) and the lower clamping plate (4).

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