Handling tool

Abstract

To provide a technique for reducing the whole process time and cost in a process using a handling tool for handling molten nonferrous metal or dross.SOLUTION: The handling tool (1) for handling the handling object which is the molten metal or dross of the nonferrous metal has a protective layer (3) formed for suppressing the adhesion of the handling object and the reaction with the handling object on the outermost layer coming into contact with the handling object. The protective layer is composed of a passive state formed on the outermost layer of the base material 2. For example, the base material is made of an iron-based material containing chromium, and the protective layer is made of chromium oxide. The protection layer has a thickness greater than the side 2nm. A surface (31) of the protective layer has an uneven shape. The uneven shape is formed so that a contact angle of an object to be handled is 90 degrees or more.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a handling tool for handling molten metal or dross of non-ferrous metals. [Background technology]

[0002] It is necessary to prevent adhesion of molten metal to tools used for handling molten metal. If molten metal cools while still attached to the tools, solidified materials such as metals and metal oxides will adhere to the tools, causing various workability problems. In addition, molten metals of light metals are generally highly reducing and may corrode the tools.

[0003] In this regard, for example, Patent Document 1 discloses a casting tool having a boron nitride coating layer formed on at least the portion that comes into contact with molten aluminum or aluminum alloy. The boron nitride layer can be formed by, for example, coating or immersion. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 56-6772 Summary of the Invention [Problem to be solved by the invention]

[0005] Patent Document 1 discloses, as a specific example, a dispersion of boron nitride in a colloidal state in water, which is applied to an iron-based base material, left to dry in the air at room temperature for one hour, and then heated and dried. As such, when using this type of coating technology, it takes time to dry the coating material, which increases the overall process time and cost.

[0006] The present disclosure has been made in consideration of the circumstances exemplified above, etc. That is, the present disclosure provides a technique for reducing the overall process time and cost in a process using handling tools for handling molten metal or dross of a non-ferrous metal, for example. [Means for solving the problem]

[0007] The handling tool (1) for handling an object that is a molten metal or dross of a non-ferrous metal according to claim 1 is a protective layer (3) formed on the outermost surface that comes into contact with the object to be handled, for preventing adhesion of the object to be handled and reaction with the object to be handled; The protective layer is a passivation layer formed on the outermost surface of the base material (2).

[0008] In addition, in each section of the application documents, each element may be assigned a reference symbol in parentheses. In this case, the reference symbol merely indicates an example of the correspondence between the element and the specific configuration described in the embodiment described below. Therefore, the present disclosure is not limited in any way by the description of the reference symbol. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is an enlarged cross-sectional view showing a schematic configuration of a handling tool according to an embodiment of the present disclosure. [Figure 2] 2 is an enlarged cross-sectional view showing an example of the uneven surface shape of the handling tool shown in FIG. 1. FIG. [Figure 3] 1. FIG. 4 is an enlarged cross-sectional view showing another example of the uneven surface shape of the handling tool shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] (Embodiment) Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. The following embodiments, their modifications, and the accompanying drawings are schematic or simplified for the purpose of concisely explaining the contents of the present disclosure, and are not intended to limit the contents of the present disclosure in any way. Therefore, it goes without saying that the descriptions in the drawings do not necessarily correspond to the specific device configurations actually manufactured, sold, or used. In other words, unless expressly limited by the applicant in the prosecution history of this application, it goes without saying that the present disclosure should not be interpreted as being limited by the descriptions in the drawings and the corresponding descriptions of the configurations, functions, or operations described below.

[0011] (composition) 1 and 2, a schematic configuration of a handling tool 1 according to an embodiment of the present disclosure will be described. The handling tool 1 is a tool or implement for handling a high-temperature fluid, such as molten metal or dross of a non-ferrous metal, as a handling object M, and has a structure in which a metal base material 2 is coated with a protective layer 3 at least in a portion that may come into contact with the handling object M.

[0012] The handling tool 1 according to this embodiment can be realized as a tool used by workers to scoop out molten metal or remove oxides in a factory for die-cast products made of metal aluminum or its alloys. Specifically, the handling tool 1 can be used as a derelict for removing oxides, a ladle for scooping up molten metal, etc. The material of the part of the handling tool 1 that does not come into contact with the object M to be handled (for example, the rod-shaped part that is gripped and operated by the worker) is not particularly limited as long as it is fire-resistant.

[0013] The base material 2 is made of a transition metal and is formed into a predetermined shape. Specifically, the base material 2 is made of an iron-based material containing chromium, more specifically, a steel material. In this embodiment, the base material 2 is stainless steel, and preferably contains 13% by weight or more (more preferably 20% by weight or more) of chromium. Furthermore, the base material 2 preferably contains 6% by weight or more of nickel and 4% by weight or less of molybdenum as metal elements that are added to improve the adhesion and heat resistance strength of the protective layer 3.

[0014] The protective layer 3 is a coating layer formed on the outermost layer of the handling tool 1 that comes into contact with the object M to be handled, in order to suppress adhesion of the object M to be handled and reaction with the object M. In this embodiment, the protective layer 3 is made of a passivation layer formed on the outermost layer of the base material 2. Specifically, the protective layer 3 is a passivation coating made of elements that constitute the transition metals that are components of the base material 2, and is typically made of chromium oxide, i.e., Cr2O3.

[0015] The protective layer 3 has a thickness exceeding 2 nm, which is the thickness of the passive film naturally formed on stainless steel, and is preferably 10 nm or more, and more preferably 20 nm or more. Specifically, the protective layer 3 can be made stronger than the passive film naturally formed on stainless steel, for example, by doping the surface layer of the base material 2 with oxygen, heating in an oxygen atmosphere, or using an oxidizing acid (e.g., hydrogen peroxide or dilute nitric acid). There is no particular upper limit to the thickness of the protective layer 3, as long as the desired effect can be achieved by forming and maintaining a good protective layer 3.

[0016] By including 13% by weight or more of chromium in the base material 2, it is possible to improve the heat resistance of the protective layer 3, which is a passive film. Furthermore, as the handling tool 1 is heated and cooled during use, part of the protective layer 3 made of Cr2O3 is destroyed, and oxidation progresses, producing FeCr2O4 and other compounds, which may reduce the effect of suppressing adhesion of and reaction with the object M handled. In this regard, by increasing the chromium concentration in the base material 2, it is possible to ensure the self-repairing properties of the Cr2O3 film that constitutes the protective layer 3.

[0017] Therefore, in this embodiment, it is preferable to use a high-chromium stainless steel material such as SUS310S as the base material 2. SUS310S contains 24 to 26 wt% of chromium. By increasing the chromium concentration in the base material 2, it is possible to stabilize the Cr2O3 film, which effectively suppresses the reaction with molten aluminum. Furthermore, by setting the carbon concentration to 0.1 wt% or less, it is possible to stabilize the Cr 23 It is possible to effectively suppress the decrease in chromium concentration due to the generation of C6.

[0018] As shown in Fig. 2, by roughening the surface 31 of the protective layer 3 that comes into contact with the object M to be handled by forming an uneven shape and setting the contact angle θ of the object M to 90 degrees or more, it is possible to effectively suppress adhesion of the object M to be handled and reaction with the object M to be handled. In addition, by adjusting the depth of the recesses 32 in the uneven shape, i.e., the height of the protrusions 33, and the contact area with the object M to be handled, it is possible to suppress heat transfer to the base material 2 (specifically, to reduce the heat transfer coefficient to 1 / 2 or less). Any known method can be used for roughening the surface, such as fine particle shot blasting, laser processing, or chemical treatment including etching.

[0019] 2 shows the wet state of the object M based on the Wenzel model, which assumes that the entire surfaces of the recesses 32 and protrusions 33 in the uneven shape of the surface 31 are wet. The uneven shape of the surface 31 that realizes such a wet state can be realized, for example, by forming the recesses 32 into a mortar-like or dimple-like shape. Such an uneven shape can be easily formed, for example, by roughening the surface by shot blasting.

[0020] On the other hand, the example in FIG. 3 shows the wet state of the object M based on the Cassie-Baxter model, which assumes that the recesses 32 in the uneven shape of the surface 31 are in contact with the trapped air without getting wet. In such a wet state, the contact angle θ can be made larger, and the effect of suppressing heat transfer to the base material 2 is also enhanced. Such a wet state can be achieved by forming the recesses 32 in the shape of pores, as shown in FIG. 3. Such an uneven shape can be easily formed, for example, by laser processing.

[0021] There are no particular limitations on the sizes of the recesses 32 and protrusions 33 in the uneven surface 31 as long as the desired contact angle θ is formed, but the optimal value may vary depending on the fluid properties (e.g., viscosity) of the molten metal or dross. Specifically, for example, when using a handling tool 1 having a surface 31 with a dimpled shape with a depth of about 20 to 50 μm, recesses 32 with a width of about 100 to 150 μm, and protrusions 33 with a top surface width of about 20 to 50 μm, a good non-wetting effect with respect to molten aluminum was obtained. As for the surface roughness, for example, Ra is preferably about 10 μm and Rz is about 50 to 70 μm.

[0022] As described above in detail, in this embodiment, in order to suppress adhesion or reaction of the object M to be handled in the handling tool 1, instead of providing a coating that requires drying or baking on the surface layer of the base material 2, a protective layer 3 is formed as a passive film. In other words, this embodiment makes it possible to eliminate the need for a coating in the handling tool 1. Therefore, this embodiment makes it possible to provide a technology that reduces the overall process time and cost in a process using the handling tool 1 that handles molten metal or dross of non-ferrous metals.

[0023] (Variation) The present disclosure is not limited to the above-described embodiment. Therefore, the above-described embodiment can be modified as appropriate. Representative modifications will be described below. In the following description of the modifications, differences from the above-described embodiment will be mainly described. Furthermore, the same reference numerals are used for parts that are identical or equivalent to each other in the above-described embodiment and the modifications. Therefore, in the following description of the modifications, the description of the above-described embodiment can be used as appropriate for components that have the same reference numerals as the above-described embodiment, unless there is a technical contradiction or special additional explanation.

[0024] The present disclosure is not limited to the specific configurations or structures described in the above embodiments and examples. That is, for example, there are no particular limitations on the use of the handling tool 1 or the shape, structure, material, etc. of the base material 2. Specifically, for example, the molten metal as the object M to be handled by the handling tool 1 is not limited to aluminum or its alloys, but may be magnesium or its alloys.

[0025] It goes without saying that the elements constituting the above-described embodiments are not necessarily essential unless expressly stated as essential or clearly considered essential in principle. Furthermore, when numerical values ​​such as the number, amount, and range of components are mentioned, the present disclosure is not limited to those specific numerical values ​​unless expressly stated as essential or clearly limited to specific numerical values ​​in principle. Similarly, when the shape, direction, positional relationship, etc. of components are mentioned, the present disclosure is not limited to those shapes, directions, positional relationships, etc., unless expressly stated as essential or clearly limited to specific shapes, directions, positional relationships, etc. in principle.

[0026] (Disclosure perspective) As is clear from the above description of the embodiments and modifications, this specification discloses at least the following matters. [First viewpoint] A handling tool (1) for handling objects that are non-ferrous metal molten metal or dross, a protective layer (3) formed on the outermost surface that comes into contact with the object to be handled, for preventing adhesion of the object to be handled and reaction with the object to be handled; The protective layer is a passivation layer formed on the outermost surface of the base material (2). Handling equipment. [Second perspective] the base material is made of a transition metal, The protective layer is formed of a passivation layer of elements constituting the transition metal. 10. The handling tool according to the first aspect. [Third Perspective] the base material is made of an iron-based material containing chromium, The protective layer is made of chromium oxide. Handling equipment according to the second aspect. [Fourth viewpoint] The base material contains 13% by weight or more of chromium. A handling tool according to the third aspect. [Fifth viewpoint] The base material is made of a steel material having a carbon concentration of 0.1% by weight or less. A handling tool according to the third or fourth aspect. [Sixth viewpoint] the base material contains a metal element as an additive component for improving the adhesion and heat resistance strength of the protective layer; The handling tool according to any one of the third to fifth aspects. [Seventh viewpoint] The base material contains, as the metal elements, nickel in an amount of 6% by weight or more and molybdenum in an amount of 4% by weight or less. A handling tool according to a sixth aspect. [Eighth viewpoint] The protective layer has a thickness of more than 2 nm. A handling tool according to any one of the first to seventh aspects. [Ninth viewpoint] The surface (31) of the protective layer has an uneven shape. A handling tool according to any one of the first to eighth aspects. [10th viewpoint] The uneven shape is formed so that the contact angle of the object to be handled is 90 degrees or more. A handling tool according to a ninth aspect. [11th viewpoint] The uneven shape is formed so as to suppress heat transfer to the base material. A handling tool according to the ninth or tenth aspect. [Explanation of symbols]

[0027] 1. Handling equipment 2 Base material 3 protective layer 31 Surface 32 recess 33 Convex part M Handling target θ contact angle

Claims

1. A handling tool (1) for handling objects that are molten or dross of non-ferrous metals, a protective layer (3) formed on the outermost surface that comes into contact with the object to be handled, for suppressing adhesion of the object to be handled and reaction with the object to be handled; The protective layer is a passivation layer formed on the outermost surface of the base material (2). Handling equipment.

2. the base material is made of a transition metal, The protective layer is formed of a passivation layer of elements constituting the transition metal. The handling tool according to claim 1.

3. the base material is made of an iron-based material containing chromium, The protective layer is made of chromium oxide. The handling tool according to claim 2.

4. The base material contains 13% by weight or more of chromium. The handling tool according to claim 3.

5. The base material is made of a steel material having a carbon concentration of 0.1 wt% or less.

5. The handling tool according to claim 4.

6. the base material contains a metal element as an additive component for improving the adhesion and heat resistance strength of the protective layer; The handling tool according to claim 3.

7. The base material contains, as the metal elements, nickel in an amount of 6% by weight or more and molybdenum in an amount of 4% by weight or less.

7. The handling tool according to claim 6.

8. The protective layer has a thickness of more than 2 nm. The handling tool according to claim 1.

9. The surface (31) of the protective layer has an uneven shape. The handling tool according to claim 1.

10. The uneven shape is formed so that the contact angle of the object to be handled is 90 degrees or more.

10. The handling tool according to claim 9.

11. The uneven shape is formed so as to suppress heat transfer to the base material.

10. The handling tool according to claim 9.

Images