Method for obtaining morphology of solid-phase additive single-point sedimentary body

Abstract

The invention belongs to the technical field of metal material solid-phase additive manufacturing, and particularly relates to a morphology obtaining method for a solid-phase additive single-point sedimentary body. Comprising the following steps that a base plate is arranged below a spray gun nozzle, the spray gun nozzle is perpendicular to the base plate, a baffle is arranged between the spray gun nozzle for cold spraying solid-phase deposition and the base plate, the baffle is parallel to the base plate, and an open hole is formed in the baffle; based on the high-pressure cold-spraying solid-phase deposition technology, single-point deposition body forming is carried out, in the single-point deposition body forming process, the relative positions of a spray gun nozzle and a base plate are fixed and do not move, a baffle is horizontally moved from one side of the base plate to the other side of the base plate, and a single-point deposition body is obtained; and measuring the three-dimensional size of the single-point sedimentary body to obtain the morphology of the single-point sedimentary body. According to the method, the defect that the appearance of the cold spraying solid-phase additive is difficult to control accurately is overcome, the morphology obtaining method of the solid-phase additive single-point sedimentary body is provided, a foundation is laid for establishment of a cold spraying solid-phase additive accumulation model, and establishment of a shape control method of the cold spraying solid-phase additive is facilitated.

Description

Technical Field

[0001] The present invention belongs to the technical field of solid-phase additive manufacturing of metal materials, and in particular relates to a method for acquiring the morphology of a solid-phase additive single-point deposited body. Background Art

[0002] Solid-phase additive manufacturing is a process that uses friction, mechanical pressure or speed to cause metal raw materials to undergo plastic deformation in the solid phase and then be stacked and deposited layer by layer to finally achieve the preparation of three-dimensional solid components. Compared with molten additive manufacturing, solid-phase additive manufacturing has low heat input and no melting and solidification of metal, which avoids the common cracks and pore defects of molten metal additive manufacturing. Especially in multi-material additive manufacturing, it can effectively avoid the formation of intermetallic compounds at the heterogeneous interface. In addition, solid-phase additive also has the advantages of high deposition rate, high material utilization, low energy consumption, and excellent mechanical properties of the deposited body. It has a wide range of applicability to light metals and high plasticity materials such as aluminum alloys, magnesium alloys, titanium alloys and copper alloys, and has been increasingly widely used in aerospace, national defense, military industry, rail transportation and other fields. Cold spray solid-phase additive is a solid-phase additive technology developed from surface coating technology. It uses high-pressure gas to accelerate micron-level powder to an extremely high speed, so that it hits the substrate or deposited particles in the solid state to undergo severe plastic deformation and form a metallurgical bond locally. Cold spray solid phase additive manufacturing has become one of the most popular solid phase additive manufacturing technologies due to its unique low-temperature and high-speed deposition, excellent deposited body properties and high preparation efficiency. At present, it has been widely used in remanufacturing in many fields such as aerospace, metallurgical machinery and petrochemical industry.

[0003] Cold spray solid phase deposition is a "point-line-surface-body" accumulation method that converts "points" into "lines", "lines" into "surfaces", and "surfaces" into "body". The "point" of cold spray solid phase deposition is a single-point deposition body, which is a deposition body formed on the substrate at a certain instant or in a very short time interval. Therefore, the characteristics of the single-point deposition body of cold spray solid phase deposition are the basis for establishing a material accumulation model. However, during the cold spray solid phase deposition process, the particles in the working gas are unevenly distributed in the powder beam. After a single-channel deposition, the single-point deposition body presents a "ridge" shape that is thick in the middle and thin on both sides. Cold spray deposition is sensitive to the deposition angle. Based on this, repeated accumulation of a single channel will result in a "triangular" slope, resulting in unstable forming dimensions of the accumulation layer formed by a single-channel deposition, and the preset target shape cannot be achieved. The biggest challenge facing cold spray solid phase deposition as an additive manufacturing technology is shape control, and it is impossible to achieve high-precision forming of parts with complex shapes, which greatly limits its application in parts with complex shapes. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a method for obtaining the morphology of a single-point deposited body of a solid-phase additive material. In order to overcome the difficulty in accurately controlling the shape of cold-sprayed solid-phase additive materials, a method for obtaining the morphology of a point-deposited unit body of a cold-sprayed solid-phase additive material is disclosed. Based on the cold-sprayed solid-phase deposition process, the morphology of the instantaneous single-point deposited body is obtained through the spray gun nozzle and deposition process parameters in the cold-sprayed solid-phase deposition, so as to realize the establishment of a material single-channel repeated accumulation model through the morphology of the single-point deposited body, and develop an adaptive process path based on this, so as to alleviate the "triangular" slope caused by the single-channel repeated accumulation, resulting in the instability of the forming size of the accumulation layer formed by the single-channel deposition, achieve the preset target shape, promote the establishment of a shape control method for cold-sprayed solid-phase additive materials, realize the high-precision forming of parts with complex shapes, and further expand the application of cold-sprayed solid-phase additive materials in the preparation of complex-shaped components in the fields of aerospace, energy and power, rail transportation, etc.

[0005] The present invention solves the above technical problems through the following technical solutions.

[0006] The object of the present invention is to provide a method for obtaining the morphology of a solid-phase additive single-point deposited body, comprising the following steps:

[0007] S1. A pre-treated substrate is provided below the spray gun nozzle of the cold spray solid phase deposition equipment, wherein the spray gun nozzle and the substrate are perpendicular to each other; a baffle is provided and placed between the spray gun nozzle of the cold spray solid phase deposition and the substrate and the baffle is parallel to the substrate, and an opening is provided on the baffle.

[0008] S2. Based on the high-pressure cold spray solid phase deposition process, the size of the spray gun nozzle, deposition temperature, gas pressure, deposition distance, scanning rate and powder feeding rate of the cold spray solid phase deposition are selected, and metal powder is used as cold spray powder to form a single-point deposition body. During the formation of the single-point deposition body, the relative position of the spray gun nozzle and the substrate is fixed and does not move, and the baffle is translated from one side of the substrate to the other side to obtain a single-point deposition body.

[0009] S3. Measure the three-dimensional size of the single-point sediment body and obtain the morphology of the single-point sediment body by processing the point cloud data.

[0010] Furthermore, the width of the opening is smaller than the outlet diameter of the spray gun nozzle by 0 mm to 2 mm.

[0011] Furthermore, the opening has a length of 30 mm and a width of 4 mm to 5 mm.

[0012] Furthermore, the throat diameter of the spray gun nozzle is 2mm-3mm, the outlet diameter is 5mm-6mm, the contraction section length is 80mm-90mm, and the expansion section length is 160mm-190mm.

[0013] Furthermore, the height between the baffle and the substrate is 10 mm to 15 mm, and the translation speed of the baffle is 100 mm / s to 500 mm / s.

[0014] Furthermore, the deposition distance between the spray gun nozzle and the substrate is 20 mm to 30 mm.

[0015] Furthermore, the metal powder is copper powder prepared by water atomization, and the particle size of the copper powder is 10 μm to 60 μm.

[0016] Furthermore, the substrate is an aluminum alloy substrate.

[0017] Furthermore, the baffle is made of 316 stainless steel.

[0018] Furthermore, the substrate pretreatment is to spray corundum on the substrate at a pressure of 0.4MPa to 0.8MPa to remove the oxide scale.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention proposes a method for acquiring the morphology of a single-point deposited body of a solid-phase additive material. The spray gun nozzle and the substrate of a cold spray solid-phase deposition device are fixed, there is no relative movement, and the spraying time is short. The opening form and movement mode of the baffle of the single-point deposited body are designed. Based on the high-pressure cold spray solid-phase deposition process, the size of the cold spray solid-phase additive spray gun nozzle is established, and the process parameters such as deposition temperature, gas pressure, deposition distance, scanning rate and powder feeding rate are adjusted to obtain different single-point deposited bodies. The size of the single-point deposited body is measured, and the cross-sectional contour curve of the single-point deposited body is obtained by processing three-dimensional point cloud data, that is, the morphology of the single-point deposited body is obtained. The present invention discloses for the first time a method for acquiring the morphology of a point deposition unit body of cold spray solid phase additive material, so as to realize the establishment of a single-channel repeated accumulation model of the material through the morphology of the single-point deposition body, and develop an adaptive process path based on this, so as to alleviate the "triangular" slope caused by the single-channel repeated accumulation, resulting in the instability of the forming size of the accumulation layer formed by the single-channel deposition, promote the establishment of a shape control method for cold spray solid phase additive material, realize high-precision forming of parts with complex shapes, promote the further application of cold spray solid phase additive material in the preparation of complex-shaped components in the fields of aerospace, energy and power, rail transportation, etc., and provide a solution for the high-performance preparation of key components. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The process flow chart of the method for acquiring the morphology of a single-point deposited body of solid-phase additive manufacturing according to the present invention.

[0022] Figure 2 This is a physical picture of the single-point deposition body of Example 1 of the present invention.

[0023] Figure 3This is a three-dimensional point cloud data diagram of a single-point sediment body in Example 1 of the present invention. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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 creative work are within the scope of protection of the present invention.

[0025] It should be noted that the professional terms used in the present invention are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of the present invention. Certain words are used in the present invention to refer to specific components. Those skilled in the art should understand that technicians will use different nouns to refer to the same component. The present invention does not distinguish between components by the difference in nouns, but by the difference in the functions of the components. As mentioned throughout the specification and claims, "including" is an open term and should be understood as "including but not limited to".

[0026] Cold spray solid phase deposition is a "point-line-surface-body" accumulation method that converts "points" into "lines", "lines" into "surfaces", and "surfaces" into "body". Therefore, the characteristics of single-point deposits in cold spray solid phase deposition are the basis for establishing a material accumulation model. A single-point deposit is a deposit formed on a substrate at a certain instant or in a very short time interval. However, the process characteristics of cold spraying, such as continuous powder feeding and high spray gun movement rate, make it difficult to obtain the morphology of instantaneous single-point deposits.

[0027] Based on the above problems, the present invention provides a method for obtaining the morphology of a single-point deposited solid-phase additive material. The preparation process is as follows: Figure 1 As shown, the following steps are included:

[0028] S1. A pre-treated substrate is provided below the spray gun nozzle of the cold spray solid phase deposition equipment, wherein the spray gun nozzle and the substrate are perpendicular to each other; a baffle is provided and placed between the spray gun nozzle of the cold spray solid phase deposition and the substrate and the baffle is parallel to the substrate, and an opening is provided on the baffle.

[0029] S2. Based on the high-pressure cold spray solid phase deposition process, the size of the spray gun nozzle, deposition temperature, gas pressure, deposition distance and powder feeding rate of the cold spray solid phase deposition are selected, and metal powder is used as cold spray powder to form a single-point deposition body. During the formation of the single-point deposition body, the relative position of the spray gun nozzle and the substrate is fixed and does not move, and the baffle is translated from one side of the substrate to the other side to obtain a single-point deposition body.

[0030] S3. Measure the three-dimensional size of the single-point sediment body and obtain the morphology of the single-point sediment body by processing the point cloud data.

[0031] The present invention is based on the cold spray solid phase deposition process, and meets the requirements that the spray gun nozzle and the spray gun nozzle and the substrate of the cold spray solid phase deposition equipment are fixed, there is no relative movement, and the spraying time is short. The single-point deposition body baffle opening form and movement mode are designed. Based on the high-pressure cold spray solid phase deposition process, the size of the cold spray solid phase additive Laval nozzle is established, the deposition temperature, gas pressure, deposition distance and powder feeding rate process parameters are adjusted, different single-point deposition bodies are obtained, the size of the single-point deposition body is measured, and by processing the three-dimensional point cloud data, the cross-sectional contour curve of the single-point deposition body is obtained, and the three-dimensional size data of the single-point deposition body is obtained, that is, the morphology of the single-point deposition body is obtained. The present invention discloses for the first time a method for acquiring the morphology of a cold spray solid phase additive point deposition unit body, so as to realize the establishment of a material single-channel repeated accumulation model through the morphology of a single-point deposition body, and develop an adaptive process path based on this, so as to alleviate the "triangular" slope body caused by the single-channel repeated accumulation, resulting in the instability of the forming size of the accumulation layer formed by the single-channel deposition, promote the establishment of a cold spray solid phase additive shape control method, realize the high-precision forming of parts with complex shapes, and promote the further application of cold spray solid phase additive in the preparation of complex shape components in the fields of aerospace, energy and power, rail transportation, etc., and provide a solution for the high-performance preparation of key components. Among them, the measurement of the single-point deposition body is to use a non-contact three-dimensional scanner to measure the size of the single-point deposition body, and obtain the cross-sectional contour curve of the single-point deposition body by processing the three-dimensional point cloud data. The non-contact three-dimensional scanner measurement collects data synchronously through two cameras at a certain angle, decodes and calculates the obtained image, uses stereo matching technology to obtain the three-dimensional point cloud data of the sample, and then processes the three-dimensional data to obtain the three-dimensional size data of the single-point deposition body, that is, to obtain the morphology of the single-point deposition body.

[0032] In a specific embodiment, the width of the opening is smaller than the outlet diameter of the spray gun nozzle by 0 mm to 2 mm. It should be noted that the size of the opening is designed based on the beam spot diameter of the single-point deposition body, and the width of the opening is smaller than the beam spot diameter of the single-point deposition body. In the present invention, the beam spot diameter of the single-point deposition body is greater than 6 mm.

[0033] In a specific embodiment, the opening is 30 mm long and 4 mm to 5 mm wide. Preferably, the opening is located in the center of the baffle plate and is a rectangular hole. The baffle plate is placed between the spray gun and the substrate by a robot and kept parallel to the substrate.

[0034] In a specific embodiment, the throat diameter of the spray gun nozzle is 2mm-3mm, the outlet diameter is 5mm-6mm, the contraction section length is 80mm-90mm, and the expansion section length is 160mm-190mm. It should be noted that the spray gun nozzle used in the present invention is a Laval nozzle, which is one of the core components of cold spray solid phase additive. Through the contraction and expansion of the internal structure, the inert gas forms a high-speed airflow and carries the powder particles to hit the substrate at high speed to form a deposited body.

[0035] In a specific embodiment, the height between the baffle and the substrate is 10-15 mm, and the baffle translation speed is 100 mm / s-500 mm / s. It should be noted that during the translation of the baffle, the relative position of the spray gun nozzle and the substrate remains unchanged and both are fixed at one position without moving. Only the baffle translates between the spray gun nozzle and the substrate. This design avoids the relative movement of the substrate and the spray gun, which causes the superposition of single-point deposition. The rapid movement of the baffle ensures that the deposition is completed in a very short time, satisfying the requirement that the single-point deposition body is a deposition body formed on the substrate at an instant or extreme time interval.

[0036] In a specific embodiment, the deposition distance between the spray gun nozzle and the substrate is 20 mm to 30 mm, the deposition temperature is 400° C. to 800° C., the gas pressure is 2 MPa to 5 MPa, and the powder feeding rate is 50 g / min to 100 g / min. It should be noted that the present invention regulates the deposition temperature, gas pressure, deposition distance and powder feeding rate process parameters in order to ensure that the spray gun nozzle exceeds the critical velocity of copper particle deposition of 300 m / s to 500 m / s after acceleration, and reaches a copper particle velocity of 500 m / s to 700 m / s, which is convenient for the deposition of copper particles.

[0037] In a specific embodiment, the metal powder is copper powder prepared by water atomization, and the particle size of the copper powder is 10μm to 60μm. It should be noted that the copper powder prepared by water atomization is irregularly spherical, and the particle size of the copper powder is 10μm to 60μm. The metal powder used in the present invention is a conventional metal powder for solid-phase additive manufacturing, such as widely used in aerospace, energy power or rail transportation. The present invention selects the metal powder to be copper powder prepared by water atomization, and its water atomization process is stable, the cost is more economical, and the industrial source is wide, so as to illustrate the morphology acquisition method of the solid-phase additive single-point deposition body provided by the present invention.

[0038] In a specific embodiment, the substrate is an aluminum alloy substrate. It should be noted that the aluminum alloy substrate used in the present invention is 2219 aluminum alloy, mainly copper alloy has a high deposition efficiency on the relatively soft 2219 aluminum alloy substrate, preferably, the length × width × height of the 2219 aluminum alloy substrate is 100mm × 100mm × 10mm, the purpose is to form a single-point deposition body in high-pressure cold spray solid phase deposition.

[0039] In a specific embodiment, the baffle is 316 stainless steel. It should be noted that the length×width×height of 316 stainless steel is 100 mm×100 mm×5 mm, and the 316 stainless steel baffle serves to shield the single-point deposited body formed by high-pressure cold spray solid phase deposition, so that the single-point deposited body is deposited only at the position of the baffle opening.

[0040] In a specific embodiment, the substrate pretreatment is to spray corundum on the substrate at a pressure of 0.4 MPa to 0.8 MPa to remove the oxide scale.

[0041] The invention is further described below through specific examples.

[0042] Example 1

[0043] This embodiment provides a method for obtaining the morphology of a solid-phase additive single-point deposited body, comprising the following steps:

[0044] S1. 316 stainless steel is selected as the baffle, and the size of the baffle is 100mm×100mm×5mm in length×width. A rectangular opening with a length×width of 30mm×5mm is opened in the center of the baffle. A pretreated substrate is arranged under the spray gun nozzle of the cold spray solid phase deposition equipment, wherein the spray gun nozzle and the substrate are perpendicular to each other. The baffle is placed between the spray gun nozzle and the substrate by a robot and kept parallel to the substrate, and the spray gun nozzle and the substrate are perpendicular to each other.

[0045] S2. Use water-atomized copper powder as cold spray powder. The powder is irregularly spherical, with a powder particle size distribution of 10 to 60 μm and an average particle size of 20 μm. Use 2219 aluminum alloy with a length of 100 mm, a width of 100 mm, and a height of 10 mm as the substrate. Use 0.6 MPa corundum spray to remove the oxide scale before spraying. Based on the high-pressure cold spray solid phase deposition process, select the size of the Laval nozzle for cold spray solid phase deposition. The throat diameter is 2.25 mm, the outlet diameter is 5.8 mm, the contraction section length is 85 mm, and the expansion section length is 182 mm.

[0046] S3. Based on the high-pressure cold spray solid phase deposition process, the process parameters are as follows: deposition temperature 400°C, gas pressure 2MPa, deposition distance from the spray gun nozzle to the substrate 20mm, powder feeding rate 60g / min, single-point deposition body formation is performed. During the single-point deposition body formation process, the relative position of the spray gun nozzle and the substrate is fixed and does not move. The height between the baffle and the substrate is 15mm. The baffle is translated from one side of the substrate to the other side at a speed of 200mm / s to obtain a single-point deposition body.

[0047] S4. Use a non-contact scanner to measure the three-dimensional size of the deposited body, and extract the cross-sectional contour curve of the single-point deposited body through point cloud data processing, so as to obtain the morphology of the single-point deposited body.

[0048] Example 2

[0049] This embodiment provides a method for obtaining the morphology of a solid-phase additive single-point deposited body, comprising the following steps:

[0050] S1. 316 stainless steel is selected as the baffle, and the size of the baffle is 100mm×100mm×5mm in length×width. A rectangular opening with a length×width of 30mm×4.5mm is opened in the center of the baffle. A pre-treated substrate is arranged under the spray gun nozzle of the cold spray solid phase deposition equipment, wherein the spray gun nozzle and the substrate are perpendicular. The baffle is placed between the spray gun nozzle and the substrate by a robot and kept parallel to the substrate.

[0051] S2. Use water-atomized copper powder as cold spray powder. The powder is irregularly spherical, with a powder particle size distribution of 10 to 60 μm and an average particle size of 20 μm. Use 2219 aluminum alloy with a length of 100 mm, a width of 100 mm, and a height of 10 mm as the substrate. Use 0.6 MPa corundum spray to remove the oxide scale before spraying. Based on the high-pressure cold spray solid phase deposition process, select the size of the Laval nozzle for cold spray solid phase deposition. The throat diameter is 2.25 mm, the outlet diameter is 5.8 mm, the contraction section length is 85 mm, and the expansion section length is 182 mm.

[0052] S3. Based on the high-pressure cold spray solid phase deposition process, the process parameters are as follows: deposition temperature 400°C, gas pressure 2MPa, deposition distance from the spray gun nozzle to the substrate 20mm, powder feeding rate 60g / min, single-point deposition body formation is performed. During the single-point deposition body formation process, the relative position of the spray gun nozzle and the substrate is fixed and does not move. The height between the baffle and the substrate is 15mm. The baffle is translated from one side of the substrate to the other side at a speed of 150mm / s to obtain a single-point deposition body.

[0053] S4. Use a non-contact scanner to measure the three-dimensional size of the deposited body, and extract the cross-sectional contour curve of the single-point deposited body through point cloud data processing, so as to obtain the morphology of the single-point deposited body.

[0054] Example 3

[0055] This embodiment provides a method for obtaining the morphology of a solid-phase additive single-point deposited body, comprising the following steps:

[0056] S1. 316 stainless steel is selected as the baffle, and the size of the baffle is 100mm×100mm×5mm in length×width. A rectangular opening with a length×width of 30mm×5mm is opened in the center of the baffle. A pre-treated substrate is arranged under the spray gun nozzle of the cold spray solid phase deposition equipment, wherein the spray gun nozzle and the substrate are perpendicular. The baffle is placed between the spray gun nozzle and the substrate by a robot and kept parallel to the substrate.

[0057] S2. Use water-atomized copper powder as cold spray powder. The powder is irregularly spherical, with a powder particle size distribution of 10 to 60 μm and an average particle size of 20 μm. Use 2219 aluminum alloy with a length of 100 mm, a width of 100 mm, and a height of 10 mm as the substrate. Use 0.6 MPa corundum spray to remove the oxide scale before spraying. Based on the high-pressure cold spray solid phase deposition process, select the size of the Laval nozzle for cold spray solid phase deposition. The throat diameter is 2.25 mm, the outlet diameter is 5.8 mm, the contraction section length is 85 mm, and the expansion section length is 182 mm.

[0058] S3. Based on the high-pressure cold spray solid phase deposition process, the process parameters are as follows: deposition temperature 400°C, gas pressure 2MPa, deposition distance from the spray gun nozzle to the substrate 20mm, powder feeding rate 60g / min, single-point deposition body forming is performed. During the single-point deposition body forming process, the relative position of the spray gun nozzle and the substrate is fixed and does not move. The height between the baffle and the substrate is 15mm. The baffle is translated from one side of the substrate to the other side at a speed of 300mm / s to obtain a single-point deposition body.

[0059] S4. Use a non-contact scanner to measure the three-dimensional size of the deposited body, and extract the cross-sectional contour curve of the single-point deposited body through point cloud data processing, so as to obtain the morphology of the single-point deposited body.

[0060] Example 4

[0061] This embodiment provides a method for obtaining the morphology of a solid-phase additive single-point deposited body, comprising the following steps:

[0062] S1. 316 stainless steel is selected as the baffle, and the size of the baffle is 100mm×100mm×5mm in length×width. A rectangular opening with a length×width of 30mm×5mm is opened in the center of the baffle. A pre-treated substrate is arranged under the spray gun nozzle of the cold spray solid phase deposition equipment, wherein the spray gun nozzle and the substrate are perpendicular. The baffle is placed between the spray gun nozzle and the substrate by a robot and kept parallel to the substrate.

[0063] S2. Use water-atomized copper powder as cold spray powder. The powder is irregularly spherical, the powder particle size distribution is 10 to 60 μm, and the average particle size is 20 μm: select 2219 aluminum alloy with a length of 100 mm × width of 100 mm × height of 10 mm as the substrate, and use 0.6 MPa corundum spray to remove the oxide scale before spraying. Based on the high-pressure cold spray solid phase deposition process, select the size of the Laval nozzle for cold spray solid phase deposition, with a throat diameter of 2 mm, an outlet diameter of 5 mm, a contraction section length of 90 mm, and an expansion section length of 180 mm.

[0064] S3. Based on the high-pressure cold spray solid phase deposition process, the process parameters are as follows: deposition temperature 400°C, gas pressure 2MPa, deposition distance from the spray gun nozzle to the substrate 20mm, powder feeding rate 60g / min, single-point deposition body formation is performed. During the single-point deposition body formation process, the relative position of the spray gun nozzle and the substrate is fixed and does not move. The height between the baffle and the substrate is 15mm. The baffle is translated from one side of the substrate to the other side at a speed of 200mm / s to obtain a single-point deposition body.

[0065] S4. Use a non-contact scanner to measure the three-dimensional size of the deposited body, and extract the cross-sectional contour curve of the single-point deposited body through point cloud data processing, so as to obtain the morphology of the single-point deposited body.

[0066] Example 5

[0067] This embodiment provides a method for obtaining the morphology of a solid-phase additive single-point deposited body, comprising the following steps:

[0068] S1. 316 stainless steel is selected as the baffle, and the size of the baffle is 100mm×100mm×5mm in length×width. A rectangular opening with a length×width of 30mm×5mm is opened in the center of the baffle. A pre-treated substrate is arranged under the spray gun nozzle of the cold spray solid phase deposition equipment, wherein the spray gun nozzle and the substrate are perpendicular. The baffle is placed between the spray gun nozzle and the substrate by a robot and kept parallel to the substrate.

[0069] S2. Use water-atomized copper powder as cold spray powder. The powder is irregularly spherical, with a powder particle size distribution of 10 to 60 μm and an average particle size of 20 μm. Use 2219 aluminum alloy with a length of 100 mm, a width of 100 mm, and a height of 10 mm as the substrate. Use 0.6 MPa corundum spray to remove the oxide scale before spraying. Based on the high-pressure cold spray solid phase deposition process, select the size of the Laval nozzle for cold spray solid phase deposition. The throat diameter is 2.25 mm, the outlet diameter is 5.8 mm, the contraction section length is 85 mm, and the expansion section length is 182 mm.

[0070] S3. Based on the high-pressure cold spray solid phase deposition process, the process parameters are as follows: deposition temperature 400°C, gas pressure 2MPa, deposition distance between the spray gun nozzle and the substrate 20mm, powder feeding rate 100g / min, single-point deposition body forming is performed. During the single-point deposition body forming process, the relative position of the spray gun nozzle and the substrate is fixed and does not move. The height between the baffle and the substrate is 15mm. The baffle is translated from one side of the substrate to the other side at a speed of 200mm / s to obtain a single-point deposition body.

[0071] S4. Use a non-contact scanner to measure the three-dimensional size of the deposited body, and extract the cross-sectional contour curve of the single-point deposited body through point cloud data processing, so as to obtain the morphology of the single-point deposited body.

[0072] Example 6

[0073] This embodiment provides a method for obtaining the morphology of a solid-phase additive single-point deposited body, comprising the following steps:

[0074] S1. 316 stainless steel is selected as the baffle, and the size of the baffle is 100mm×100mm×5mm in length×width. A rectangular opening with a length×width of 30mm×5mm is opened in the center of the baffle. A pre-treated substrate is arranged under the spray gun nozzle of the cold spray solid phase deposition equipment, wherein the spray gun nozzle and the substrate are perpendicular. The baffle is placed between the spray gun nozzle and the substrate by a robot and kept parallel to the substrate.

[0075] S2. Use water-atomized copper powder as cold spray powder. The powder is irregularly spherical, with a powder particle size distribution of 10 to 60 μm and an average particle size of 20 μm. Use 2219 aluminum alloy with a length of 100 mm, a width of 100 mm, and a height of 10 mm as the substrate. Use 0.6 MPa corundum spray to remove the oxide scale before spraying. Based on the high-pressure cold spray solid phase deposition process, select the size of the Laval nozzle for cold spray solid phase deposition. The throat diameter is 2.25 mm, the outlet diameter is 5.8 mm, the contraction section length is 85 mm, and the expansion section length is 182 mm.

[0076] S3. Based on the high-pressure cold spray solid phase deposition process, the process parameters are as follows: deposition temperature 600°C, gas pressure 2.5MPa, deposition distance from the spray gun nozzle to the substrate 20mm, powder feeding rate 60g / min, single-point deposition body formation is performed. During the single-point deposition body formation process, the relative position of the spray gun nozzle and the substrate is fixed and does not move. The height between the baffle and the substrate is 15mm. The baffle is translated from one side of the substrate to the other side at a speed of 200mm / s to obtain a single-point deposition body.

[0077] S4. Use a non-contact scanner to measure the three-dimensional size of the deposited body, and extract the cross-sectional contour curve of the single-point deposited body through point cloud data processing, so as to obtain the morphology of the single-point deposited body.

[0078] Example 7

[0079] This embodiment provides a method for obtaining the morphology of a solid-phase additive single-point deposited body, comprising the following steps:

[0080] S1. 316 stainless steel is selected as the baffle, and the size of the baffle is 100mm×100mm×5mm in length×width. A rectangular opening with a length×width of 30mm×5mm is opened in the center of the baffle. A pre-treated substrate is arranged under the spray gun nozzle of the cold spray solid phase deposition equipment, wherein the spray gun nozzle and the substrate are perpendicular. The baffle is placed between the spray gun nozzle and the substrate by a robot and kept parallel to the substrate.

[0081] S2. Use water-atomized copper powder as cold spray powder. The powder is irregularly spherical, with a powder particle size distribution of 10 to 60 μm and an average particle size of 20 μm. Use 2219 aluminum alloy with a length of 100 mm, a width of 100 mm, and a height of 10 mm as the substrate. Use 0.6 MPa corundum spray to remove the oxide scale before spraying. Based on the high-pressure cold spray solid phase deposition process, select the size of the Laval nozzle for cold spray solid phase deposition. The throat diameter is 2.25 mm, the outlet diameter is 5.8 mm, the contraction section length is 85 mm, and the expansion section length is 182 mm.

[0082] S3. Based on the high-pressure cold spray solid phase deposition process, the process parameters are as follows: deposition temperature 800°C, gas pressure 3MPa, deposition distance from the spray gun nozzle to the substrate 20mm, powder feeding rate 60g / min, single-point deposition body formation is performed. During the single-point deposition body formation process, the relative position of the spray gun nozzle and the substrate is fixed and does not move. The height between the baffle and the substrate is 15mm. The baffle is translated from one side of the substrate to the other side at a speed of 200mm / s to obtain a single-point deposition body.

[0083] S4. Use a non-contact scanner to measure the three-dimensional size of the deposited body, and extract the cross-sectional contour curve of the single-point deposited body through point cloud data processing, so as to obtain the morphology of the single-point deposited body.

[0084] Figure 2 This is a physical picture of a single-point deposition body according to Example 1 of the present invention. Figure 2 As shown, since the outlet of the spray gun is circular, the shape of the single-point deposited body is circular, and the diameter is higher than that of the circular nozzle, which is mainly caused by the expansion and expansion of the particles in the jet during the cold spray solid phase deposition process.

[0085] Figure 3 3D point cloud data of a single-point sediment body according to Example 1 of the present invention. Figure 3 As shown in the figure, through the three-dimensional data collection, it is found that the single-point deposition body is high in the center and thins near the edge, and its shape is similar to a spherical crown. This is mainly due to the fact that there are more particles in the center of the cold spray solid phase deposition particle beam and fewer particles at the edge.

[0086] Comparing the changes in the height from the center to the radial direction to the boundary of the single-point deposition body prepared in Examples 1 to 7, as shown in Table 1, when the deposition conditions are improved, such as increasing the pressure and temperature of the working gas, such as in Examples 1, 5, 6 and 7, the impact speed of the deposited particles and the deposition efficiency can be improved, and the thickness of the single-point deposition body can be increased; when the speed of the baffle translation is changed, such as in Examples 1, 2 and 3, the diameter of the single-point deposition body does not change, but the height of the deposition body decreases with the increase of the single plate movement speed; when the size of the Laval nozzle is changed, the speed of adding gas is affected, and then the speed of depositing particles is affected. When the particles are accelerated to a higher speed, the height of the deposition body is higher; when the outlet diameter of the Laval nozzle is larger, the size of the single-point deposition body is also larger, such as in Examples 1 and 4.

[0087] Table 1. Changes in the height of a single-point sediment body from the center to the radial direction to the boundary height

[0088]

[0089] In summary, the present invention provides a method for acquiring the morphology of a single-point deposited body of a solid-phase additive material. In order to overcome the difficulty in accurately controlling the shape of cold-sprayed solid-phase additive materials, based on the requirements that the spray gun nozzle and the substrate of cold-sprayed solid-phase deposition are fixed, there is no relative movement, and the spraying time is short, the single-point deposited body baffle opening form and movement mode are designed, based on the high-pressure cold-sprayed solid-phase deposition process, the size of the cold-sprayed solid-phase additive Laval nozzle is established, and the deposition temperature, gas pressure, deposition distance, scanning rate, powder feeding rate and other process parameters are adjusted to obtain different single-point deposited bodies, and a non-contact three-dimensional scanner is used to measure the size of the single-point deposited body, and the cross-sectional contour curve of the single-point deposited body is obtained by processing the three-dimensional point cloud data, that is, the morphology of the single-point deposited body is obtained. For the first time, a method for acquiring a point deposition unit body of cold-sprayed solid-phase additive materials is disclosed, which lays the foundation for the establishment of a cold-sprayed solid-phase additive accumulation model, helps to establish a shape control method for cold-sprayed solid-phase additive materials, promotes the further application of cold-sprayed solid-phase additive materials in the preparation of complex-shaped components in the fields of aerospace, energy and power, rail transportation, etc., and provides a solution for the high-performance preparation of key components.

[0090] It should be noted that when the present invention involves a numerical range, it should be understood that the two endpoints of each numerical range and any value between the two endpoints can be selected. Since the steps and methods used are the same as those in the embodiments, in order to avoid redundancy, the present invention describes a preferred embodiment. Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they know the basic creative concept. Therefore, the attached claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0091] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for acquiring the morphology of a solid-phase additive single-point deposition body, characterized in that: The following steps are involved: A pre-treated substrate is provided below the spray gun nozzle of the cold spray solid phase deposition device, wherein the spray gun nozzle and the substrate are perpendicular to each other; a baffle is provided and placed between the spray gun nozzle of the cold spray solid phase deposition device and the substrate and the baffle is parallel to the substrate, and an opening is provided on the baffle; Based on the high-pressure cold spray solid phase deposition process, the size of the spray gun nozzle, deposition temperature, gas pressure, deposition distance and powder feeding rate of the cold spray solid phase deposition are selected, and metal powder is used as cold spray powder to form a single-point deposition body. During the formation of the single-point deposition body, the relative position of the spray gun nozzle and the substrate is fixed and does not move, and the baffle is translated from one side of the substrate to the other side to obtain a single-point deposition body; The three-dimensional size of a single-point sediment body is measured, and the morphology of the single-point sediment body is obtained by processing the point cloud data.

2. The method for acquiring the morphology of a solid-phase additive single-point deposition body according to claim 1, characterized in that: The width of the opening is smaller than the outlet diameter of the spray gun nozzle by 0 mm to 2 mm.

3. The method for acquiring the morphology of a solid-phase additive single-point deposition body according to claim 2, characterized in that: The opening has a length of 30 mm and a width of 4 mm to 5 mm.

4. The method for acquiring the morphology of a solid-phase additive single-point deposition body according to claim 2, characterized in that: The throat diameter of the spray gun nozzle is 2mm~3mm, the outlet diameter is 5mm~6mm, the contraction section length is 80mm~90mm, and the expansion section length is 160~190mm.

5. The method for acquiring the morphology of a solid-phase additive single-point deposition body according to claim 1, characterized in that: The height between the baffle and the substrate is 10 mm to 15 mm, and the translation speed of the baffle is 100 mm / s to 500 mm / s.

6. The method for acquiring the morphology of a solid-phase additive single-point deposition body according to claim 1, characterized in that: The deposition distance between the spray gun nozzle and the substrate is 20mm to 30mm.

7. The method for acquiring the morphology of a solid-phase additive single-point deposition body according to claim 1, characterized in that: The metal powder is copper powder prepared by water atomization, and the particle size of the copper powder is 10 μm to 60 μm.

8. The method for acquiring the morphology of a solid-phase additive single-point deposition body according to claim 1, characterized in that: The substrate is an aluminum alloy substrate.

9. The method for acquiring the morphology of a solid-phase additive single-point deposition body according to claim 1, characterized in that: The baffle is made of 316 stainless steel.

10. The method for acquiring the morphology of a solid-phase additive single-point deposition body according to claim 1, characterized in that: The substrate pretreatment is to spray corundum on the substrate at a pressure of 0.4MPa to 0.8MPa to remove the oxide scale.

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