High-wear-resistance metal casting with multidirectional stress dispersion pore channels

Abstract

The utility model discloses a high-wear-resistance metal casting with multidirectional stress dispersion pore channels, and relates to the technical field of metal castings. The wear-resistant metal casting comprises a metal casting body, the metal casting body comprises a casting body, and the surface of the casting body is coated with a wear-resistant layer. The wear resistance of the metal casting is remarkably improved by constructing the multiple composite wear-resistant layers on the surface of the casting body, the surface of the casting body is treated by a carbonitriding process to obtain a hardened metal layer, the hardness and wear resistance of the surface of a base body are effectively improved, a solid foundation is laid for a whole wear-resistant layer system, and the service life of the metal casting is prolonged. The tungsten carbide alloy wear-resistant alloy layer welded on the casting can resist high-frequency friction and fretting wear by means of extremely high hardness and wear resistance, the sprayed silicon carbide ceramic wear-resistant coating further enhances the hardness of the surface and endows the casting with good high-temperature resistance and corrosion resistance, and the Teflon coating on the outermost layer can resist high-temperature resistance and corrosion resistance of the casting. A surface having a low coefficient of friction may be formed.

Description

Technical Field

[0001] This utility model belongs to the field of metal casting technology, and in particular relates to a highly wear-resistant metal casting with multi-directional stress dispersion channels. Background Technology

[0002] In the field of high-end equipment manufacturing, machine tool castings, as core basic components, directly determine the machining accuracy retention and service life of the entire machine through their surface wear resistance. With the development of advanced manufacturing technologies such as precision machining and high-speed cutting, machine tool castings must withstand the combined effects of high-frequency friction, multi-directional fretting wear, and alternating loads during long-term operation. Especially in critical contact areas such as guide rail pairs and bearing housing holes, the accuracy degradation caused by surface wear has become a major bottleneck restricting the reliability of machine tools. Although existing technologies have achieved preliminary equilibrium of multi-directional stress through internal cavity dispersion channel design, improving surface wear resistance still faces the dual challenges of material selection and coating processes.

[0003] Traditional wear-resistant surface treatments for metal castings primarily rely on increasing the hardness of the base material itself or employing a single surface hardening process. For example, tempering can improve the strength of the base material, or surface strengthening methods such as carburizing and quenching can be used in localized areas. However, these methods can only improve surface hardness to a limited extent and cannot form an independent wear-resistant protection system. In high-speed cutting machine tools, the relative sliding speed between the casting surface and moving parts can reach over 50 m / min. Traditional hardened layers are prone to plastic deformation when the contact stress exceeds 500 MPa, leading to the peeling off of the surface material. Furthermore, in heavy-duty machining scenarios, the coupling effect of vertical load and tangential friction can exacerbate the propagation of surface microcracks, resulting in combined damage from abrasive wear and fatigue wear.

[0004] To address these issues, we provide a high-wear-resistant metal casting with multi-directional stress-dispersing channels. Utility Model Content

[0005] The purpose of this invention is to provide a high wear-resistant metal casting with multi-directional stress dispersion channels. By combining the casting body and the wear-resistant layer, it solves the industry problem of fast surface wear rate and easy coating failure in existing metal castings.

[0006] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution.

[0007] This utility model relates to a high wear-resistant metal casting with multi-directional stress dispersion channels, comprising a metal casting body, the metal casting body including a casting body, the surface of the casting body being covered with a wear-resistant layer, the wear-resistant layer including a hardened metal layer, a wear-resistant alloy layer welded to the surface of the hardened metal layer, a ceramic wear-resistant coating sprayed onto the surface of the wear-resistant alloy layer, and a Teflon coating sprayed onto the surface of the ceramic wear-resistant coating.

[0008] The present invention is further configured such that multi-directional stress dispersion channels are formed on the surface and inner cavity of the casting body. The formation of multi-directional stress dispersion channels on the surface and inner cavity of the casting body can effectively disperse and balance multi-directional stress, avoid stress concentration, improve the fatigue resistance and structural stability of the casting, and enable it to maintain good performance under complex stress conditions.

[0009] The present invention is further configured such that the hardened metal layer is obtained by treating the surface of the casting body through a carbonitriding process. This process can form a surface layer with high hardness and wear resistance on the surface of the casting body, enhance the mechanical properties of the substrate surface, and provide a solid foundation for the wear-resistant layer system.

[0010] The present invention is further configured such that the wear-resistant alloy layer is made of tungsten carbide alloy, which has extremely high hardness and wear resistance, and can effectively resist high-frequency friction and fretting wear, thereby improving the wear resistance performance of the wear-resistant layer.

[0011] The present invention is further configured such that the ceramic wear-resistant coating is made by spraying silicon carbide powder. Silicon carbide ceramic has the advantages of high hardness, high temperature resistance, and corrosion resistance, which further enhances the comprehensive performance of the wear-resistant layer and enables it to adapt to complex environments such as high temperature and corrosion.

[0012] The present invention is further configured such that the Teflon coating is formed by Teflon spraying, and the Teflon coating is sprayed in two to three layers. The Teflon coating has a low coefficient of friction, which can reduce frictional resistance and reduce wear. The multi-layer structure makes the coating more uniform and dense, thereby improving the durability and protective effect of the coating.

[0013] The present invention is further configured such that the surface of the metal casting body is covered with a protective film. The protective film can form an additional comprehensive protective barrier on the outside of the wear-resistant layer. The protective film can effectively resist the direct erosion of the wear-resistant layer by external corrosive media, dust particles, etc., and reduce the coating failure problem caused by chemical corrosion or abrasive wear.

[0014] The present invention has the following beneficial effects.

[0015] 1. This utility model significantly improves the wear resistance of metal castings by constructing a multi-layer composite wear-resistant layer on the surface of the casting body. The surface of the casting body is treated with a carbonitriding process to obtain a hardened metal layer, which effectively improves the hardness and wear resistance of the substrate surface, laying a solid foundation for the entire wear-resistant layer system. The tungsten carbide alloy wear-resistant alloy layer welded on top of this, with its extremely high hardness and wear resistance, can resist high-frequency friction and fretting wear. The sprayed silicon carbide ceramic wear-resistant coating not only further enhances the surface hardness, but also gives the casting good high-temperature resistance and corrosion resistance. The outermost Teflon coating can form a low friction coefficient surface, reduce frictional resistance, and reduce wear. The multi-layer structure works synergistically to construct a complete wear-resistant protection system from substrate strengthening to surface friction reduction, effectively coping with wear problems under complex working conditions such as high-speed cutting and heavy-load machining, and extending the service life of metal castings.

[0016] 2. The multi-directional stress dispersion channels opened on the surface and inner cavity of the casting body of this utility model can effectively disperse and balance multi-directional stress. When the metal casting is subjected to complex stresses such as alternating loads and multi-directional fretting wear, these channels can guide the stress to be transmitted in multiple directions, avoiding stress concentration in local areas. This reduces problems such as plastic deformation and microcrack propagation caused by stress concentration, improves the fatigue resistance and structural stability of the casting, and combined with the protective effect of its surface wear-resistant layer, enables the metal casting to maintain good performance when subjected to the synergistic effect of multi-directional stress and wear, meeting the needs of high-precision and long-life basic components in the field of high-end equipment manufacturing. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0018] Figure 1 This is a three-dimensional view of a highly wear-resistant metal casting with multi-directional stress dispersion channels.

[0019] Figure 2 This is a rear view schematic diagram of a high-wear-resistant metal casting with multi-directional stress dispersion channels.

[0020] Figure 3 This is a side cross-sectional schematic diagram of a high-wear-resistant metal casting with multi-directional stress dispersion channels.

[0021] Figure 4 This is a schematic front sectional view of a high-wear-resistant metal casting with multi-directional stress dispersion channels.

[0022] Figure 5 This is a schematic diagram of the internal connection structure of the wear-resistant layer in a high-wear-resistant metal casting with multi-directional stress dispersion channels.

[0023] In the attached diagram: 1. Metal casting body; 11. Casting body; 12. Wear-resistant layer; 121. Hardened metal layer; 122. Wear-resistant alloy layer; 123. Ceramic wear-resistant coating; 124. Teflon coating. Detailed Implementation

[0024] The technical solutions of the present utility model will be described below with reference to the accompanying drawings. The described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0025] Example 1

[0026] Please see Figure 1-5 This utility model is a high wear-resistant metal casting with multi-directional stress dispersion channels, including a metal casting body 1, the metal casting body 1 including a casting body 11, the surface of the casting body 11 being covered with a wear-resistant layer 12, the wear-resistant layer 12 including a hardened metal layer 121, a wear-resistant alloy layer 122 welded to the surface of the hardened metal layer 121, a ceramic wear-resistant coating 123 sprayed on the surface of the wear-resistant alloy layer 122, and a Teflon coating 124 sprayed on the surface of the ceramic wear-resistant coating 123.

[0027] Specifically: The casting body 11 serves as a basic support structure, and its surface is entirely covered with a wear-resistant layer 12 to achieve wear-resistant protection for the casting body 11. The wear-resistant layer 12 is composed of multiple functional layers formed by different materials and processes. The innermost layer is a hardened metal layer 121, which is obtained by treating the surface of the casting body 11 through a carbonitriding process. This process allows carbon and nitrogen atoms to penetrate into the surface of the casting body 11, forming a surface layer with high hardness and wear resistance, tightly adhering to the surface of the casting body 11 and enhancing the mechanical properties of the substrate surface. Tungsten carbide alloy is welded to the surface of the hardened metal layer 121 using a laser overlay welding process. Tungsten carbide alloy itself has extremely high hardness... The wear-resistant alloy layer 122 has high hardness and wear resistance, effectively resisting external friction and wear. The surface of the wear-resistant alloy layer 122 is coated with silicon carbide powder by supersonic flame spraying to form a ceramic wear-resistant coating 123. The spraying process allows the silicon carbide powder to be uniformly adhered and cured on the surface of the wear-resistant alloy layer 122, forming a ceramic layer with high hardness, high temperature resistance, and corrosion resistance, which further improves the comprehensive performance of the wear-resistant layer 12. The surface of the ceramic wear-resistant coating 123 is coated with Teflon coating liquid by spraying equipment to form a Teflon coating 124. The multi-layer spraying makes the Teflon coating 124 more uniform and dense, which can form a surface with a low coefficient of friction, reducing friction and wear between the contact parts, while also having good chemical stability and corrosion resistance.

[0028] Example 2

[0029] Please see Figure 1-5Based on Example 1, the surface and inner cavity of the casting body 11 are provided with multi-directional stress dispersion channels. The hardened metal layer 121 is obtained by treating the surface of the casting body 11 through carbonitriding process. The wear-resistant alloy layer 122 is made of tungsten carbide alloy. The ceramic wear-resistant coating 123 is made by spraying silicon carbide powder. The Teflon coating 124 is made by spraying Teflon film. Two to three layers of Teflon coating 124 are sprayed. The surface of the metal casting body 1 is covered with a protective film.

[0030] Specifically: Multi-directional stress dispersion channels are formed on the surface and inner cavity of the casting body 11, which can effectively disperse and balance multi-directional stress, avoid stress concentration, improve the fatigue resistance and structural stability of the casting, and maintain good performance under complex stress conditions. The hardened metal layer 121 is obtained by treating the surface of the casting body 11 through a carbonitriding process. This process can form a surface layer with high hardness and wear resistance on the surface of the casting body 11, enhance the mechanical properties of the substrate surface, and provide a solid foundation for the wear-resistant layer 12 system. Tungsten carbide alloy has extremely high hardness and wear resistance, which can effectively resist high-frequency friction and fretting wear, and improve the wear-resistant layer. The wear resistance of the wear-resistant layer 12 is enhanced by the high hardness, high temperature resistance, and corrosion resistance of silicon carbide ceramics. This further improves the overall performance of the wear-resistant layer 12, enabling it to adapt to complex environments such as high temperature and corrosiveness. The Teflon coating 124 has a low coefficient of friction, which can reduce frictional resistance and wear. The multi-layer structure makes the coating more uniform and dense, improving the durability and protective effect of the coating. The protective film can form an additional comprehensive protective barrier on the outside of the wear-resistant layer 12. This protective film can effectively resist the direct erosion of the wear-resistant layer 12 by external corrosive media, dust particles, etc., and reduce coating failure caused by chemical corrosion or abrasive wear.

[0031] The working principle of this utility model is as follows: the multi-directional stress dispersion channels on the surface and inner cavity of the casting body 11 can disperse and guide the multi-directional stress it bears, so that the stress is evenly distributed and avoids local stress concentration, thereby reducing material damage caused by stress concentration. At the same time, the wear-resistant layers 12 on the surface work together. The hardened metal layer 121 improves the surface hardness and wear resistance of the casting body 11 through carbonitriding process, serving as a basic support. The wear-resistant alloy layer 122, with the high hardness and wear resistance of tungsten carbide alloy, resists the main external friction and wear. The ceramic wear-resistant coating 123 further enhances the surface hardness and also has high temperature resistance and corrosion resistance to cope with complex environments. The outermost Teflon coating 124 forms a low-friction surface, reducing frictional resistance and wear. From the inside to the outside, they play the roles of strengthening, wear resistance, protection, and friction reduction, and together construct a multi-layered, multi-functional wear-resistant protection system. When the metal casting is subjected to the synergistic effect of multi-directional stress and wear, it can effectively reduce wear and fatigue damage, extend service life, and meet the needs of high-end equipment manufacturing.

[0032] The preferred embodiments of the present utility model disclosed above are only used to help illustrate the present utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the present utility model to the specific implementation methods described. The present specification selects and specifically describes these embodiments in order to better explain the principle and practical application of the present utility model, so that those skilled in the art can better understand and utilize the present utility model.

Claims

1. A high-wear-resistant metal casting with multi-directional stress-dispersing channels, comprising a metal casting body (1), characterized in that: The metal casting body (1) includes a casting body (11), and the surface of the casting body (11) is covered with a wear-resistant layer (12); The wear-resistant layer (12) includes a hardened metal layer (121), a wear-resistant alloy layer (122) is welded to the surface of the hardened metal layer (121), a ceramic wear-resistant coating (123) is sprayed onto the surface of the wear-resistant alloy layer (122), and a Teflon coating (124) is sprayed onto the surface of the ceramic wear-resistant coating (123).

2. The high wear-resistant metal casting with multi-directional stress dispersion channels according to claim 1, characterized in that: The surface and inner cavity of the casting body (11) are provided with multi-directional stress dispersion channels.

3. A high-wear-resistant metal casting with multi-directional stress dispersion channels according to claim 1, characterized in that: The hardened metal layer (121) is obtained by treating the surface of the casting body (11) with a carbonitriding process.

4. A high-wear-resistant metal casting with multi-directional stress dispersion channels according to claim 1, characterized in that: The wear-resistant alloy layer (122) is made of tungsten carbide alloy.

5. A high-wear-resistant metal casting with multi-directional stress dispersion channels according to claim 1, characterized in that: The ceramic wear-resistant coating (123) is made by spraying silicon carbide powder.

6. A high-wear-resistant metal casting with multi-directional stress dispersion channels according to claim 1, characterized in that: The Teflon coating (124) is formed by Teflon spraying, and the Teflon coating (124) is sprayed in two to three layers.

7. A high-wear-resistant metal casting with multi-directional stress dispersion channels according to claim 1, characterized in that: The surface of the metal casting body (1) is covered with a protective film.

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