An alloy cutting tool

Abstract

This invention provides an alloy cutting tool, which uses additive manufacturing technology to bond and deposit alloy powder layer by layer to form a multi-layered buffer layer with gradient changes. Each layer of the buffer layer is sprayed with a liquid phase inhibitor of different concentrations. The use of liquid phase inhibitors effectively solves the problem of small gradient depth in traditional atmosphere sintering, thereby forming a softer hard alloy layer on the surface, which can improve the toughness of the tool substrate and enhance the adhesion between the substrate and the coating. The micro-protrusions on the surface can effectively improve the anti-adhesion performance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cutting tools, in particular to an alloy tool. BACKGROUND

[0002] With the continuous emergence of various new difficult-to-machine materials, the machining difficulty of product parts is increased, and the performance of machining tools is also required to be higher, especially the impact resistance and anti-bonding performance of the tool.

[0003] At present, high-hardness materials are usually selected to prepare machining tools to improve their impact resistance, and coatings are coated on the surface of the tool or the smoothness of the rake face of the tool is improved to improve their anti-bonding performance. However, high-hardness coated tools have the disadvantages of being more prone to damage under impact, especially under micro high-frequency impact, causing early failure of the tool and uncontrollable failure process. SUMMARY

[0004] Therefore, the purpose of the present application is to provide an alloy tool to solve the above problems.

[0005] The present application adopts the following scheme:

[0006] The present application provides an alloy tool, which is formed by layer-by-layer bonding, accumulation and sintering of alloy powder by additive manufacturing technology, and includes a base layer and a plurality of buffer layers with gradient change in composition; each layer of the buffer layer is sprayed with a liquid phase inhibitor, and the concentration of the liquid phase inhibitor in each layer is different, and after sintering, the buffer layer with gradient change in alloy composition is formed; the outer surface of the buffer layer is coated with a coating layer.

[0007] Further, the alloy powder is a mixed powder of tungsten carbide powder and cobalt powder.

[0008] Further, a plurality of micro convex bodies are provided on the buffer layer, and the outer surface of the micro convex body is coated with a coating layer.

[0009] Further, the liquid phase inhibitor is coated on the upper surface of the buffer layer at appropriate intervals, and the micro convex body is formed after sintering.

[0010] Further, the size of the micro convex body provided on the upper surface of the buffer layer can be adjusted according to the coating of the liquid phase inhibitor.

[0011] Further, the micro convex body is in the shape of a spherical cap.

[0012] By adopting the above technical scheme, the present application can achieve the following technical effects:

[0013] The alloy cutter is formed by layer-by-layer bonding and sintering of alloy powder by using additive manufacturing technology, and a plurality of buffer layers are formed to form a plurality of buffer layers with gradient change; each layer of the buffer layers is sprayed with liquid phase inhibitors with different concentrations; the use of the liquid phase inhibitors effectively solves the problem of small gradient depth in traditional atmosphere sintering, and further forms a softer hard alloy layer on the surface, so that the toughness of the cutter substrate is improved, and the bonding force between the substrate and the coating is enhanced; and the micro convex body on the surface can effectively improve the anti-bonding performance. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0015] Figure 1 is a schematic diagram of an alloy cutter structure according to an embodiment of the present application;

[0016] Figure 2 is a schematic diagram of a cross-sectional structure of a micro convex body of an alloy cutter according to an embodiment of the present application;

[0017] Figure legend: substrate layer 1, buffer layer 2, micro convex body 3, crystal grain 4. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0019] EMBODIMENT

[0020] COMBINATION Figure 1 AND Figure 2As shown, the embodiment provides an alloy cutter, which is formed by additive manufacturing technology to bond and sinter alloy powder layer by layer, including a substrate layer 1 and a buffer layer 2 with gradient change in composition; each layer of the buffer layer 2 is sprayed with a liquid phase inhibitor, and the concentration of the liquid phase inhibitor of each layer is different, and after sintering, the buffer layer with gradient change in alloy composition is formed; the outer surface of the buffer layer is coated with a coating layer.

[0021] In the embodiment, the alloy powder is a mixed powder of tungsten carbide powder and cobalt powder. By using the liquid phase inhibitor and adjusting the concentration of each layer, the metallurgical reaction between tungsten carbide particles in the sintering process is inhibited to control the tungsten carbide grain size, and then the surface forms a hard alloy layer with gradient distribution of tungsten carbide particle size, which can improve the toughness of the cutter substrate and enhance the bonding force between the substrate and the coating.

[0022] As known, in the process of metal cutting, the toughness and hardness of the cutter are inversely proportional, the higher the hardness, the worse the toughness, so different cutting processes have different requirements for the thickness and gradient of the buffer layer 2, and the traditional atmosphere sintering control gradient method has great limitations, while the invention uses additive manufacturing technology (3DP) to spray different concentrations of liquid phase inhibitors on each layer of alloy powder in the buffer layer 2, and then forms a larger gradient depth by controlling the tungsten carbide particle size; that is, under the action of different concentrations of the liquid phase inhibitor, the metallurgical reaction between tungsten carbide particles in the sintering process is inhibited to control the tungsten carbide grain size, and then a gradient buffer layer 2 is formed. This method is simple and efficient, and the thickness and gradient of the buffer layer 2 can be adjusted according to actual needs.

[0023] In the embodiment, a plurality of spherical cap-shaped micro protrusions 3 are arranged on the buffer layer 2, which can effectively reduce the actual contact area in the machining process and thus reduce the adhesive wear and improve the anti-adhesion performance of the cutter. The spherical cap-shaped micro protrusions 3 can effectively reduce stress concentration and prevent the micro protrusions 3 from falling off. The micro protrusions 3 are formed by coating the liquid phase inhibitor on the upper surface of the buffer layer 2 at appropriate intervals. The interval between the micro protrusions 3 can be controlled by a program code to control the movement of the liquid phase vibration dispersion system, so as to avoid the interval between the micro protrusions 3 being too large, which causes the grains 4 in the metal material to easily embed into the gap between the micro protrusions 3, so that the micro protrusions 3 lose the anti-adhesion effect; also to avoid the interval between the micro protrusions 3 being too small, which increases the manufacturing difficulty.

[0024] It should be noted that the essence of the metal bonding process is the deformation of the metal internal grains 4, the sliding process of the grain boundary and the process of the grains 4 embedding the grinding surface. The optimal shape and spacing of the micro-convex body 3 depend on the grain size of the metal material, so the optimal shape and spacing of the micro-convex body 3 of different materials are different. The size of the micro-convex body 3 can be adjusted according to the liquid phase inhibitor, for example, different concentrations of the liquid phase inhibitor are applied on the same or different spacing of the buffer layer 2, so as to realize the preparation of the micro-convex body 3 with different sizes and spacing on the surface.

[0025] Of course, the outer surface of the micro-convex body 3 is coated with a coating layer, which further improves the anti-bonding performance of the tool.

[0026] The following describes the forming steps of the tool:

[0027] Step 1: Prepare the mixed powder of tungsten carbide powder and cobalt powder, and prepare the binder and different concentrations of the liquid phase inhibitor at the same time;

[0028] Step 2: Layer-by-layer powder laying printing is performed by the 3DP printing equipment, wherein after laying each layer of the mixed powder of tungsten carbide powder and cobalt powder, the binder is sprayed, and then the next layer of the mixed powder of tungsten carbide powder and cobalt powder is laid, and the process is repeated until the powder laying and bonding of the base layer 1 are completed according to the geometric shape of the tool.

[0029] Step 3: Start the powder laying and bonding of the buffer layer 2; after laying each layer of the mixed powder of tungsten carbide powder and cobalt powder, the 3DP printing equipment sprays the binder and the liquid phase inhibitor; until the powder laying and bonding of the buffer layer 2 are completed; wherein the concentration of the liquid phase inhibitor of each layer is different, and changes in a gradient manner.

[0030] Step 4: Process the microstructure on the surface of the buffer layer 2; specifically, different concentrations of the liquid phase inhibitor are applied on the same or different spacing of the buffer layer 2.

[0031] Step 5: Sinter the formed tool base to form the buffer layer 2 with a gradient and the surface micro-convex body 3.

[0032] Step 6: Apply a coating layer on the sintered formed tool.

[0033] The tool above adopts additive manufacturing technology to bond and accumulate alloy powder layer by layer to form a buffer layer 2 with gradient change in composition; each layer of the buffer layer 2 is sprayed with a liquid phase inhibitor with different concentrations; and the metallurgical reaction between tungsten carbide particles in the sintering process is inhibited to control the tungsten carbide grain size, thereby solving the problem of small gradient depth, and the surface forms a relatively soft hard alloy layer, which can improve the toughness of the tool substrate and enhance the bonding force between the substrate and the coating; and the convex surface and the coating layer on the surface can effectively improve the anti-bonding performance.

[0034] The above is only a preferred embodiment of the present application, and the protection scope of the present application is not limited to the above-mentioned embodiments, and any technical solution falling within the concept of the present application belongs to the protection scope of the present application.

[0035] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship shown in the drawings, and are only used for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0036] In addition, the terms "first", "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0037] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0038] In the present application, unless specifically stated and limited otherwise, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "over" the second feature includes that the first feature is directly above and obliquely above the second feature, or only means that the first feature is horizontally higher than the second feature. The first feature "under", "below" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or only means that the first feature is horizontally lower than the second feature.

Claims

1. An alloyed tool made by additive manufacturing technique by layer by layer bonding and sintering of alloyed powder, characterized in that, The alloy powder is a mixed powder of tungsten carbide powder and cobalt powder.

2. The alloy tool according to claim 1, characterized in that, The size of the micro-protrusions provided on the upper surface of the buffer layer can be regulated according to the coating of the liquid phase inhibitor.

3. The alloy tool of claim 1 wherein, The micro-protrusions are in the shape of a spherical cap.

4. The alloy tool of claim 1 wherein, The micro-protrusions are in the shape of a spherical cap.

Images