Alloy cutter

Abstract

The invention provides an alloy cutter which is characterized in that alloy powder is bonded, stacked and sintered layer by layer by adopting an additive manufacturing technology to form a plurality of buffer layers with gradient changes; liquid phase inhibitors with different concentrations are sprayed on all the buffer layers; the problem that the gradient depth is small in traditional atmosphere sintering is effectively solved through use of the liquid phase inhibitor, then a soft hard alloy layer is formed on the surface, and the effects of improving the toughness of a cutter base body and enhancing the binding force of the base body and a coating can be achieved; and the micro-bulges on the surface can effectively improve the anti-bonding performance.

Description

Technical Field

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

[0002] With the continuous emergence of various new difficult-to-process materials, the processing difficulty of product parts has increased, and correspondingly, higher requirements have been placed on the performance of processing tools, especially the impact resistance and anti-adhesion performance of the tools.

[0003] At present, high-hardness materials are usually used to prepare machining tools to improve their impact resistance, and coatings are applied to the tool surface, or the smoothness of the tool rake face is improved to improve its anti-adhesion performance. However, high-hardness coated tools have the disadvantages of being more easily damaged by impact, especially microscopic high-frequency impact, resulting in early failure of the tool and uncontrollable failure process. Summary of the invention

[0004] In view of this, an object of the present invention is to provide an alloy cutting tool to solve the above-mentioned problem.

[0005] The present invention adopts the following scheme:

[0006] The present application provides an alloy cutting tool, which adopts additive manufacturing technology to bond, stack and sinter alloy powder layer by layer, including a base layer and a plurality of buffer layers with gradient composition changes; 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 alloy composition changes is formed; the outer surface of the buffer layer is coated with a coating layer.

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

[0008] Furthermore, a plurality of micro-protrusions are arranged on the buffer layer, and the outer surfaces of the micro-protrusions are coated with a coating layer.

[0009] Furthermore, the liquid phase inhibitor is coated on the upper surface of the buffer layer at an appropriate interval and then sintered to form the micro-protrusions.

[0010] Furthermore, the size of the micro-protrusions disposed on the upper surface of the buffer layer can be controlled according to the coating of the liquid phase inhibitor.

[0011] Furthermore, the micro-convex body is in the shape of a spherical crown.

[0012] By adopting the above technical solution, the present invention can achieve the following technical effects:

[0013] The present invention provides an alloy cutting tool, which adopts additive manufacturing technology to bond, stack and sinter alloy powder layer by layer, and forms a plurality of buffer layers with gradient changes; each layer of the buffer layer is sprayed with a liquid phase inhibitor with different concentrations; the use of the liquid phase inhibitor effectively solves the problem of small gradient depth in traditional atmosphere sintering, thereby forming a softer cemented carbide layer on the surface, which can improve the toughness of the tool substrate and enhance the bonding strength between the substrate and the coating; and the micro-convex bodies of the coating layer on the surface can effectively improve the anti-adhesion performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 This is a schematic diagram of the structure of an alloy tool according to an embodiment of the present invention;

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

[0017] Icon: base layer 1, buffer layer 2, micro-protrusions 3, and grains 4. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0019] Example

[0020] Combination Figure 1 and Figure 2As shown, this embodiment provides an alloy tool, which adopts additive manufacturing technology to bond, stack and sinter alloy powder layer by layer, including a base layer 1, and a buffer layer 2 with a gradient composition; each layer of the buffer layer 2 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 a gradient alloy composition is formed; the outer surface of the buffer layer is coated with a coating layer.

[0021] In this embodiment, the alloy powder is a mixed powder of tungsten carbide powder and cobalt powder. By using a liquid phase inhibitor and adjusting the different concentrations of each layer, the metallurgical reaction between tungsten carbide particles during sintering is inhibited to control the size of tungsten carbide grains, and then a cemented carbide layer with a gradient distribution of tungsten carbide particle sizes is formed on the surface, which can improve the toughness of the tool substrate and enhance the bonding strength between the substrate and the coating.

[0022] As is known to all, in the process of metal cutting, the toughness of the tool and the hardness of the tool are inversely related. The higher the hardness, the worse the toughness. Therefore, different cutting processes have different requirements for the thickness and gradient of the buffer layer 2. The traditional atmosphere sintering controlled gradient method has great limitations. 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, thereby forming a larger gradient depth in a way of controlling the particle size of tungsten carbide particles; that is, under the action of different concentrations of the liquid phase inhibitor, the metallurgical reaction between tungsten carbide particles during the sintering process is suppressed to control the size of tungsten carbide grains, thereby forming a gradient buffer layer 2. This method is simple and efficient, and the thickness and gradient of the buffer layer 2 can be adjusted and prepared according to actual needs.

[0023] In this embodiment, a plurality of spherical crown-shaped micro-convex bodies 3 are provided on the buffer layer 2, which can effectively reduce the actual contact area of ​​the processing process, thereby reducing bonding wear and improving the anti-bonding performance of the tool. The spherical crown-shaped micro-convex bodies 3 can effectively reduce stress concentration and prevent the micro-convex bodies 3 from falling off. The micro-convex bodies 3 are formed by coating the liquid phase inhibitor at appropriate intervals on the upper surface of the buffer layer 2 and sintering. It can control the movement of the liquid phase vibration dispersion system to control the spacing between the micro-convex bodies 3 through program code to avoid the spacing between the micro-convex bodies 3 being too large, causing the grains 4 in the metal material to be easily embedded in the gaps between the micro-convex bodies 3, so that the micro-convex bodies 3 lose their anti-bonding effect; it also avoids the situation where the spacing between the micro-convex bodies 3 is too small, which increases the difficulty of manufacturing.

[0024] It should be noted that the essence of the metal bonding process is the deformation of the crystal grains 4 inside the metal, the sliding process of the grain boundaries and the process of the crystal grains 4 being embedded in the grinding surface. The optimal shape and spacing of the micro-protrusions 3 depend on the size of the crystal grains 4 of the metal material. Therefore, the optimal shape and spacing of the micro-protrusions 3 of different materials are different. The size of the micro-protrusions 3 of the present invention can be regulated according to the liquid phase inhibitor. For example, different concentrations of the liquid phase inhibitor are dotted on the buffer layer 2 at the same or different spacings, so as to realize the preparation of the surface micro-protrusions 3 of different sizes and spacings.

[0025] Of course, the outer surface of the micro-protrusions 3 is coated with a coating layer to further improve the anti-adhesion performance of the tool.

[0026] The forming steps of the tool are described in detail below:

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

[0028] Step 2: Perform powder printing layer by layer through a 3DP printing device, wherein each time a layer of mixed powder of tungsten carbide powder and cobalt powder is laid, a binder is sprayed, and then the next layer of mixed powder of tungsten carbide powder and cobalt powder is laid, and this is repeated to complete the powder laying and bonding of the base layer 1 according to the geometric shape of the tool;

[0029] Step 3: Start to spread powder and bond the buffer layer 2; after each layer of mixed powder of tungsten carbide powder and cobalt powder is laid, the 3DP printing device sprays out the binder and liquid phase inhibitor until the powder bonding of the buffer layer 2 is completed; wherein, the concentration of the liquid phase inhibitor in each layer is different and changes in a gradient;

[0030] Step 4: processing a microstructure on the surface of the buffer layer 2; specifically, applying different concentrations of the liquid phase inhibitor at the same or different intervals on the buffer layer 2;

[0031] Step 5: Sintering the formed tool substrate to form a gradient buffer layer 2 and surface micro-convex bodies 3;

[0032] Step 6: Apply coating to the tool after sintering.

[0033] The above-mentioned tool adopts additive manufacturing technology to bond and stack alloy powder layer by layer and sinter to form a buffer layer 2 with a gradient composition; each layer in the buffer layer 2 is sprayed with a liquid phase inhibitor with different concentrations; thereby, the metallurgical reaction between the tungsten carbide particles during the sintering process is inhibited to control the size of the tungsten carbide grains, thereby solving the problem of small gradient depth, and forming a softer cemented carbide layer on the surface, which can improve the toughness of the tool matrix and enhance the bonding force between the matrix and the coating; and the surface is a protrusion and the coating layer on the surface can effectively improve the anti-adhesion performance.

[0034] The above are only preferred implementations of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

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

[0037] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

Claims

1. An alloy tool, which is formed by bonding, stacking and sintering alloy powder layer by layer using additive manufacturing technology, characterized in that: It includes a base layer and a buffer layer with multiple layers of gradient 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 a gradient alloy composition is formed; the outer surface of the buffer layer is coated with a coating layer.

2. The alloy tool according to claim 1, characterized in that: The alloy powder is a mixed powder of tungsten carbide powder and cobalt powder.

3. The alloy tool according to claim 1 or 2, characterized in that: A plurality of micro-convex bodies are arranged on the outermost layer of the buffer layer, and the outer surfaces of the micro-convex bodies are coated with a coating layer.

4. The alloy tool according to claim 3, characterized in that: The liquid phase inhibitor is coated on the upper surface of the buffer layer at an appropriate interval, and the micro-protrusions are formed after sintering.

5. The alloy tool according to claim 4, characterized in that: The size of the micro-protrusions disposed on the upper surface of the buffer layer can be adjusted according to the coating of the liquid phase inhibitor.

6. The alloy tool according to claim 4, characterized in that: The micro-convex body is in the shape of a spherical crown.

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