阅读说明：本技术 一种丝材在网片模组上熔覆金属实体的方法 (Method for cladding metal entity on mesh module by wire material ) 是由 郭光耀 穆成成 李晋炜 马新年 周子军 于 2021-09-01 设计创作，主要内容包括：本发明的丝材增材成形中,利用电子束加工热源的高能量密度、指向性强、控制精确的优异特性,通过控制网片模组在竖直平面内的倾斜角度,控制热输入及丝材的送进数量,可精确控制电子束在原有熔覆金属与网片模组表面的能量分配,使熔化的金属液体与网片模组达到冶金结合的同时,不破坏原有网片及其催化剂镀层结构。本发明包括以下步骤：将网片模组置于两个堵头之间,并使网片模组和两个堵头固定连接在一起；熔化丝材完成一层金属网片的熔覆金属实体；逐层累积熔覆金属实体,直至将网片模组和两个堵头连接成为一体的网片组件；将网片组件的两个堵头去除,再将熔覆成形的金属实体加工至需要的尺寸,即完成在网片模组上熔覆金属实体。(In the wire additive forming process, the excellent characteristics of high energy density, strong directivity and accurate control of an electron beam processing heat source are utilized, the energy distribution of the electron beam on the surface of the original cladding metal and mesh module can be accurately controlled by controlling the inclination angle of the mesh module in a vertical plane and controlling the heat input and the feeding quantity of the wire, so that the molten metal liquid and the mesh module are metallurgically combined without damaging the original mesh and a catalyst coating structure thereof. The invention comprises the following steps: placing the mesh module between the two plugs, and fixedly connecting the mesh module and the two plugs together; melting the wire to complete the cladding metal entity of a layer of metal mesh; accumulating the cladding metal entities layer by layer until the mesh module and the two plugs are connected into a whole mesh component; and removing two plugs of the mesh component, and processing the cladding-formed metal entity to a required size to complete cladding of the metal entity on the mesh module.)

1. A method for cladding a metal entity on a mesh module by using wires is characterized by comprising the following steps:

(1) stacking multiple layers of metal meshes together to form a mesh module, placing the mesh module between the two plugs and fixedly connecting the mesh module and the two plugs together;

(2) the mesh module and the two plugs are arranged in a vacuum chamber for additive manufacturing together, so that the axis of the mesh module forms an included angle of 30-60 degrees with the horizontal plane, and then the vacuum chamber is in a vacuum working state;

(3) moving the workbench for additive manufacturing and adjusting the wire feeding length to align the position of the lower plug of the two plugs and the end part of the wire with the electron beam flow, then opening the beam flow, melting the fed wire, closing the beam flow, and extracting the wire from the surface of the cladding metal to complete the cladding forming of one point;

(4) rotating the mesh module in the vertical plane by taking the axis of the mesh module as a symmetry axis, moving to the next processing point, wherein the distance between two adjacent processing points is equal to 50-80% of the diameter of the processing point, overlapping and covering the next processing point and the previous processing point, and then repeating the step (3) to complete the cladding of the next point;

(5) repeating the step (4) until the mesh module rotates for a circle, thereby completing the cladding metal entity of a layer of metal mesh;

(6) moving the workbench for additive manufacturing to descend to the position of the next layer of metal mesh to clad metal entities of the next layer of metal mesh, wherein most energy of an electron beam is distributed on the surface of the metal mesh deposited in the previous layer, and because the workbench for additive manufacturing is moved to the position of the next layer of metal mesh, a molten pool formed by melting wires has a certain amount of deviation relative to a mesh module, and the molten pool covers the surface of the next layer of metal mesh;

(7) accumulating the cladding metal entities layer by layer until the mesh module and the two plugs are connected into a whole mesh component;

(8) and removing two plugs of the mesh component, and processing the cladding-formed metal entity to a required size to complete cladding of the metal entity on the mesh module.

2. The method for cladding the metal entity on the mesh module by the wire according to claim 1, wherein in the step (1), the mesh module and the two plugs are fixedly connected together through a tool.

Technical Field

The invention relates to the technical field of additive manufacturing, in particular to a method for cladding a metal entity on a mesh module by using a wire material.

Background

In chemical reaction in chemical field, various catalysts are commonly used to increase reaction efficiency, and the catalytic effect of the catalyst is directly related to the contact surface of the catalyst and a solution to be reacted. In order to improve the actual use efficiency of the catalyst, the catalyst is often attached to the metal mesh structure in a plating mode and is stacked layer by layer, and a solution to be reacted can play a good catalytic effect when flowing through the multi-layer mesh structure. In practical application, the metal mesh attached with the catalyst is usually fixed in the pipeline, and the solution to be reacted quickly passes through the mesh assembly formed by overlapping the metal meshes.

Currently, two methods are commonly used to secure metal mesh sheets together to form a unitary mesh assembly.

The first method is to adopt a mechanical fixing means, as shown in fig. 1, fig. 2 and fig. 3, metal meshes are stacked together to form a mesh module, then the mesh module is placed into a pipe a with steps on the inner wall, one end of the mesh module is supported on the steps of the pipe a, the other end of the mesh module is supported by a pipe B extending into the pipe a, and the pipe a and the pipe B are fixedly connected together through a buckle, a bolt, a welding mode and the like, so that the mesh module forms an integral mesh component fixed together for application.

However, in the process of using the mechanical fixing method, the gap between the outer wall and the metal mesh is gradually increased by corrosion and the like, the liquid to be reacted flows through the gap, the catalytic effect is reduced, and the long-term use is difficult.

The second method is to adopt an additive manufacturing fixing means, as shown in fig. 4, 5 and 6, to form a mesh module by stacking metal meshes together, melting wires or powder to form metal entities, and cladding the metal entities at two ends of the mesh module respectively, so that the mesh module is fixedly connected into an integral mesh component for application.

At present, the additive manufacturing fixing means adopted by the second mode is carried out by laser coaxial powder feeding or an arc fuse, and the two methods respectively have the following problems.

The main problem of the coaxial powder feeding of laser is that powder particles can remain in the inside of a mesh component during forming, the cleaning difficulty is higher, meanwhile, the energy density of the coaxial powder feeding process of laser is lower, the surface tension of molten metal formed after powder materials are melted is higher, the molten metal is easy to form drops which are difficult to spread to form a smooth and effective molten pool, and the forming difficulty is higher.

The arc fuse avoids the harm caused by powder due to the fact that wire forming is used, but due to the fact that the energy density of an arc is low and the arc has the characteristic that the arc is generated by point discharge, the surface of the metal mesh module is not flat, discharge electrodes are prone to being generated between the mesh module and the wire or the tungsten electrode, the metal mesh is burnt out, and forming difficulty is large.

Disclosure of Invention

In order to overcome the defects of the technology, the invention aims to provide a method for cladding a metal entity on a mesh module by using a wire.

The technical scheme adopted by the invention is as follows: a method for cladding a metal entity on a mesh module by using wires comprises the following steps:

(1) stacking multiple layers of metal meshes together to form a mesh module, placing the mesh module between the two plugs and fixedly connecting the mesh module and the two plugs together;

(2) the mesh module and the two plugs are arranged in a vacuum chamber for additive manufacturing together, so that the axis of the mesh module forms an included angle of 30-60 degrees with the horizontal plane, and then the vacuum chamber is in a vacuum working state;

(3) moving the workbench for additive manufacturing and adjusting the wire feeding length to align the position of the lower plug of the two plugs and the end part of the wire with the electron beam flow, then opening the beam flow, melting the fed wire, closing the beam flow, and extracting the wire from the surface of the cladding metal to complete the cladding forming of one point;

(4) rotating the mesh module in the vertical plane by taking the axis of the mesh module as a symmetry axis, moving to the next processing point, wherein the distance between two adjacent processing points is equal to 50-80% of the diameter of the processing point, overlapping and covering the next processing point and the previous processing point, and then repeating the step (3) to complete the cladding of the next point;

(5) repeating the step (4) until the mesh module rotates for a circle, thereby completing the cladding metal entity of a layer of metal mesh;

(6) moving the workbench for additive manufacturing to descend to the position of the next layer of metal mesh to clad metal entities of the next layer of metal mesh, wherein most energy of an electron beam is distributed on the surface of the metal mesh deposited in the previous layer, and because the workbench for additive manufacturing is moved to the position of the next layer of metal mesh, a molten pool formed by melting wires has a certain amount of deviation relative to a mesh module, and the molten pool covers the surface of the next layer of metal mesh;

(7) accumulating the cladding metal entities layer by layer until the mesh module and the two plugs are connected into a whole mesh component;

(8) and removing two plugs of the mesh component, and processing the cladding-formed metal entity to a required size to complete cladding of the metal entity on the mesh module.

Preferably, in the step (1), the mesh module and the two plugs are fixedly connected together through a tool.

Compared with the prior art, the invention has the following beneficial effects: according to the method for cladding the metal entity on the mesh module by the wire, disclosed by the invention, in wire additive forming, the excellent characteristics of high energy density, strong directivity and accurate control of an electron beam processing heat source are utilized, and the energy distribution of the electron beam on the surface of the original cladding metal and mesh module can be accurately controlled by controlling the inclination angle of the mesh module in a vertical plane and controlling the heat input and the feeding quantity of the wire, so that the molten metal and the mesh module are metallurgically combined, and the original mesh and a catalyst coating structure thereof are not damaged.

Drawings

FIG. 1 is a schematic structural view of a pipe fitting A in the prior art when mechanical fixing means are adopted;

FIG. 2 is a schematic structural diagram of a pipe B in the prior art when mechanical fixing means are adopted;

FIG. 3 is a schematic illustration of a prior art construction of a mesh assembly for use with mechanical fastening means;

FIG. 4 is a schematic diagram of a mesh module in the prior art using additive manufacturing fastening means;

FIG. 5 is a schematic structural diagram illustrating a process of connecting a metal entity and a mesh module when an additive manufacturing fixing means is adopted in the prior art;

FIG. 6 is a schematic illustration of a prior art construction of a mesh assembly for use with an additive manufacturing fixture;

FIG. 7 is a schematic structural view of the mesh module and two plugs of the present invention fixedly connected together;

FIG. 8 is a schematic view of the structure of the lower plug aligned with the beam current in the present invention;

FIG. 9 is a schematic view of the structure of the present invention in which the beam is turned on and the fed wire is melted;

FIG. 10 is a schematic structural view of cladding forming performed at one point in the present invention;

FIG. 11 is a schematic view of the construction of the present invention in which the molten bath covers the second layer of metal mesh;

FIG. 12 is a schematic view of the construction of the present invention in which the molten bath covers a third layer of expanded metal;

FIG. 13 is a schematic view of a mesh assembly of the present invention in which a mesh module and two plugs are integrally connected.

Detailed Description

The invention is described in detail below with reference to the figures and the specific embodiments.

Example 1

A method for cladding a metal entity on a mesh module by using wires comprises the following steps:

(1) as shown in fig. 7, multiple layers of metal meshes are stacked together to form a mesh module, and the mesh module is placed between two plugs so that the mesh module and the two plugs are fixedly connected together;

(2) the mesh module and the two plugs are arranged in a vacuum chamber for additive manufacturing together, so that the axis of the mesh module forms an included angle of 30 degrees with the horizontal plane, and then the vacuum chamber is in a vacuum working state;

(3) as shown in fig. 8, 9 and 10, the additive manufacturing workbench is moved and the wire feeding length is adjusted, so that the lower end plug of the two end plugs and the end of the wire are aligned with the electron beam flow, then the beam current is turned on to melt the fed wire, then the beam current is turned off, the wire is pulled away from the surface of the cladding metal, and the cladding forming of one point is completed;

(4) rotating the mesh module in the vertical plane by taking the axis of the mesh module as a symmetry axis, moving to the next processing point, overlapping and covering the next processing point and the previous processing point, wherein the distance between two adjacent processing points is equal to 50% of the diameter of the processing point, and repeating the step (3) to complete the cladding of the next point;

(5) repeating the step (4) until the mesh module rotates for a circle, thereby completing the cladding metal entity of a layer of metal mesh;

(6) moving the worktable for additive manufacturing to descend to the position of the next metal mesh to clad the metal entity of the next metal mesh, wherein most energy of the electron beam is distributed on the surface of the metal mesh deposited in the previous layer, and because the worktable for additive manufacturing is moved to the position of the next metal mesh, a molten pool formed by melting the wires has a certain amount of deviation relative to the mesh module, as shown in fig. 11, the molten pool covers the surface of the metal mesh in the next layer;

(7) as shown in fig. 12 and 13, the cladding metal entities are accumulated layer by layer until the mesh module and the two plugs are connected into an integrated mesh component;

(8) and removing two plugs of the mesh component, and processing the cladding-formed metal entity to a required size to complete cladding of the metal entity on the mesh module.

In the step (1), the mesh module and the two plugs are fixedly connected together through a tool.

Example 2

A method for cladding a metal entity on a mesh module by using wires comprises the following steps:

(1) as shown in fig. 7, multiple layers of metal meshes are stacked together to form a mesh module, and the mesh module is placed between two plugs so that the mesh module and the two plugs are fixedly connected together;

(2) the mesh module and the two plugs are arranged in a vacuum chamber for additive manufacturing together, so that the axis of the mesh module forms an included angle of 45 degrees with the horizontal plane, and then the vacuum chamber is in a vacuum working state;

(3) as shown in fig. 8, 9 and 10, the additive manufacturing workbench is moved and the wire feeding length is adjusted, so that the lower end plug of the two end plugs and the end of the wire are aligned with the electron beam flow, then the beam current is turned on to melt the fed wire, then the beam current is turned off, the wire is pulled away from the surface of the cladding metal, and the cladding forming of one point is completed;

(4) rotating the mesh module in the vertical plane by taking the axis of the mesh module as a symmetry axis, moving to the next processing point, overlapping and covering the next processing point and the previous processing point, wherein the distance between two adjacent processing points is equal to 60% of the diameter of the processing point, and repeating the step (3) to complete the cladding of the next point;

(5) repeating the step (4) until the mesh module rotates for a circle, thereby completing the cladding metal entity of a layer of metal mesh;

(6) moving the worktable for additive manufacturing to descend to the position of the next metal mesh to clad the metal entity of the next metal mesh, wherein most energy of the electron beam is distributed on the surface of the metal mesh deposited in the previous layer, and because the worktable for additive manufacturing is moved to the position of the next metal mesh, a molten pool formed by melting the wires has a certain amount of deviation relative to the mesh module, as shown in fig. 11, the molten pool covers the surface of the metal mesh in the next layer;

(7) as shown in fig. 12 and 13, the cladding metal entities are accumulated layer by layer until the mesh module and the two plugs are connected into an integrated mesh component;

(8) and removing two plugs of the mesh component, and processing the cladding-formed metal entity to a required size to complete cladding of the metal entity on the mesh module.

In the step (1), the mesh module and the two plugs are fixedly connected together through a tool.

Example 3

A method for cladding a metal entity on a mesh module by using wires comprises the following steps:

(1) as shown in fig. 7, multiple layers of metal meshes are stacked together to form a mesh module, and the mesh module is placed between two plugs so that the mesh module and the two plugs are fixedly connected together;

(2) the mesh module and the two plugs are arranged in a vacuum chamber for additive manufacturing together, so that the axis of the mesh module forms an included angle of 60 degrees with the horizontal plane, and then the vacuum chamber is in a vacuum working state;

(3) as shown in fig. 8, 9 and 10, the additive manufacturing workbench is moved and the wire feeding length is adjusted, so that the lower end plug of the two end plugs and the end of the wire are aligned with the electron beam flow, then the beam current is turned on to melt the fed wire, then the beam current is turned off, the wire is pulled away from the surface of the cladding metal, and the cladding forming of one point is completed;

(4) rotating the mesh module in the vertical plane by taking the axis of the mesh module as a symmetry axis, moving to the next processing point, overlapping and covering the next processing point and the previous processing point, wherein the distance between two adjacent processing points is equal to 80% of the diameter of the processing point, and repeating the step (3) to complete the cladding of the next point;

(5) repeating the step (4) until the mesh module rotates for a circle, thereby completing the cladding metal entity of a layer of metal mesh;

(6) moving the worktable for additive manufacturing to descend to the position of the next metal mesh to clad the metal entity of the next metal mesh, wherein most energy of the electron beam is distributed on the surface of the metal mesh deposited in the previous layer, and because the worktable for additive manufacturing is moved to the position of the next metal mesh, a molten pool formed by melting the wires has a certain amount of deviation relative to the mesh module, as shown in fig. 11, the molten pool covers the surface of the metal mesh in the next layer;

(7) as shown in fig. 12 and 13, the cladding metal entities are accumulated layer by layer until the mesh module and the two plugs are connected into an integrated mesh component;

(8) and removing two plugs of the mesh component, and processing the cladding-formed metal entity to a required size to complete cladding of the metal entity on the mesh module.

In the step (1), the mesh module and the two plugs are fixedly connected together through a tool.

The above embodiments are based on the technical solution of the present invention, and detailed implementation and specific operation processes are given, but the scope of the present invention is not limited to the above embodiments.