Method for manufacturing labyrinth type regulating valve based on additive manufacturing mode

Abstract

The invention belongs to the technical field of adjusting valve manufacturing, and particularly relates to a method for manufacturing a labyrinth type adjusting valve based on an additive manufacturing mode. Comprising the following steps: S1, carrying out three-dimensional model modeling on the labyrinth type regulating valve; s2, alloy powder with the same components as the adjusting valve is added into a 3D printer to form a stainless steel alloy powder bed, laser in the 3D printer serves as a heat source, surface layer powder is melted through the laser, and therefore the layer thickness parameter of 3D printing is determined; s3, performing slicing operation on the three-dimensional model by using 3D printing slicing software; s4, 3D printing is conducted according to the three-dimensional model of the adjusting valve, and the area above the flow channel is covered with a thin plate which is the same as the edge of the flow channel in shape; and S5, the step S4 is repeated until printing of the adjusting valve is completed. The multi-layer regulating valve structure is manufactured in an additive manufacturing mode, the existing sheet machining process, the chemical etching process and the whole stacking brazing process are omitted, and the problem of interlayer cracking of a lamination structure caused by welding defects or brazing filler metal failure is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of regulating valve manufacturing, and specifically relates to a method for manufacturing a labyrinth regulating valve based on additive manufacturing. Background Art

[0002] The manufacturing method of the conventional labyrinth regulating valve is mainly based on forming a labyrinth flow channel on the surface of a circular thin plate by chemical etching, and the width of the flow channel gradually widens from the inside to the outside to achieve the purpose of pressure release. The etched multiple thin plates are stacked and brazed as a whole to complete the manufacture of a multi-layer, multi-channel labyrinth regulating valve. However, this traditional manufacturing method faces the following problems: 1. It is necessary to process a large number of layered circular steel plates and perform fine processing of multiple intermediate processes such as channel etching and plate polishing; 2. The surface of the flow channel etched by chemical etching has poor roughness, and the morphology of some areas is uneven, which leads to obstruction of fluid flow and reduced pressure relief parameters, making the adjustability of the control valve worse; 3. Brazing based on a multi-layer structure may cause interlayer cracking of the laminated structure due to welding defects or failure of the brazing filler metal, so that the fluid is not released through the flow channel but leaks from between the layers, resulting in failure of the control valve; 4. Since the thickness of the layered sheet is relatively thin, only 3-5mm thick, during the brazing process, high-temperature heat treatment may cause the thin plate to warp and deform, or even if the interlayer welding is completed, there is a large residual stress inside the control valve, increasing the risk of failure and cracking during subsequent operation. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a method for manufacturing a labyrinth regulating valve based on additive manufacturing, comprising the following steps:

[0004] S1. Modeling a three-dimensional model of the labyrinth regulating valve;

[0005] S2. Adding alloy powder with the same composition as the regulating valve into a 3D printer to form a stainless steel alloy powder bed, using the laser in the 3D printer as a heat source to melt the surface powder, thereby determining the layer thickness parameters of 3D printing;

[0006] S3. Use 3D printing slicing software to slice the 3D model;

[0007] S4. Perform 3D printing according to the three-dimensional model of the regulating valve. After one layer of flow channel printing is completed, the laser head moves to the flow channel area, emits light to perform surface remelting and laser strengthening in the flow channel, and after ten layers of printing are completed, the area above the flow channel is covered with a thin plate with the same shape as the edge of the flow channel;

[0008] S5. Repeat S4 until the regulating valve printing is completed.

[0009] Furthermore, the alloy powder is austenitic stainless steel powder, and the alloy powder particle size ranges from 30 to 80 μm.

[0010] Furthermore, the laser power is selected to be 300W.

[0011] Furthermore, the layer thickness of the 3D printing is 0.3 mm, and the formed base material melting depth is 0.5-0.8 mm.

[0012] Furthermore, the laser power of the remelting and laser strengthening is 150W.

[0013] Furthermore, the thin plate is formed by straight cutting using wire cutting.

[0014] Furthermore, the thickness of the thin plate is selected to be 0.5 mm; the layer thickness interval of the laid thin plates is 3.5 mm, forming a flow channel isolation layer.

[0015] Beneficial effects of this application:

[0016] The present application solves the problems in the manufacturing method of the existing conventional labyrinth regulating valve, such as the need to process a large number of layered circular steel plates, and to carry out fine processing of multiple intermediate processes such as channel etching and plate surface polishing; the surface of the flow channel caused by chemical etching is rough, and the morphology of some areas is uneven, which leads to obstruction of fluid flow, reduction of pressure relief parameters, and poor regulation of the regulating valve; brazing based on the multi-layer structure may cause interlayer cracking of the laminated structure due to welding defects or failure of the brazing filler metal, so that the fluid is not released through the flow channel but leaks from between the layers, resulting in failure of the regulation of the regulating valve; since the thickness of the layered sheet is relatively thin, only 3-5mm thick, during the brazing process, high-temperature heat treatment may cause the thin plate to warp and deform, or even if the interlayer welding is completed, there is a large residual stress inside the regulating valve, which increases the risk of failure and cracking during subsequent operation.

[0017] This application uses additive manufacturing to complete the manufacturing process of a multi-layer regulating valve structure, eliminating the sheet processing process, chemical etching process, and brazing process of the stacked whole. At the same time, during the additive manufacturing process, the laser remelting strengthening of the flow channel surface is completed by laser surface strengthening, so that the unmelted powder on the inner surface of the flow channel is melted, and the surface strength and corrosion resistance of the flow channel are increased at the same time. The labyrinth regulating valve is manufactured as a whole and the service performance of the flow channel is increased. At the same time, manufacturing based on an integrated additive manufacturing method can significantly improve the pressure resistance inside the flow channel and can undertake pressure regulation tasks with higher parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the inner wall structure of the flow channel of a labyrinth regulating valve manufactured by traditional etching methods;

[0019] Figure 2Schematic diagram of the thin plate for manufacturing a labyrinth regulating valve based on additive manufacturing.

[0020] In the figure: 1. flow channel, 2. thin plate. DETAILED DESCRIPTION

[0021] The following will be combined with the attached Figure 1 , Attachment Figure 2 The present application is described in detail, but it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present application. In addition, in the following description, the description of the structure and technical common knowledge is omitted to avoid unnecessary confusion of the concept of the present application.

[0022] Embodiment 1:

[0023] The present application discloses a method for manufacturing a labyrinth regulating valve based on additive manufacturing, comprising the following steps:

[0024] S1. Modeling a three-dimensional model of the labyrinth regulating valve;

[0025] S2. Adding alloy powder with the same composition as the regulating valve into a 3D printer to form a stainless steel alloy powder bed, using the laser in the 3D printer as a heat source to melt the surface powder, thereby determining the layer thickness parameters of 3D printing;

[0026] S3. Use 3D printing slicing software to slice the 3D model;

[0027] S4. Perform 3D printing according to the three-dimensional model of the regulating valve. After one layer of flow channel 1 is printed, the laser head is moved to the flow channel 1 area, and the surface of the flow channel 1 is remelted and laser strengthened by emitting light. After ten layers of printing are completed, the area above the flow channel 1 is covered with a thin plate 2 having the same shape as the edge of the flow channel 1.

[0028] S5. Repeat S4 until the regulating valve printing is completed.

[0029] Furthermore, the alloy powder is austenitic stainless steel powder, and the alloy powder particle size ranges from 30 to 80 μm.

[0030] Furthermore, the laser power is selected to be 300W.

[0031] Furthermore, the layer thickness of the 3D printing is 0.3 mm, and the formed base material melting depth is 0.5-0.8 mm.

[0032] Furthermore, the laser power of the remelting and laser strengthening is 150W.

[0033] Furthermore, the thin plate 2 is formed by wire cutting.

[0034] Furthermore, the thickness of the thin plate 2 is selected to be 0.5 mm; the layer thickness interval of the laid thin plates is 3.5 mm, forming a flow channel isolation layer.

[0035] Working principle and process:

[0036] This application uses additive manufacturing, i.e. 3D printing, to complete the manufacturing process of the multi-layer regulating valve structure, eliminating the sheet processing process, chemical etching process and the brazing process of the stacked whole. At the same time, during the additive manufacturing process, the laser remelting strengthening of the flow channel surface is completed by laser surface strengthening, so that the unmelted powder on the inner surface of the flow channel is melted, and the surface strength and corrosion resistance of the flow channel are increased. The labyrinth regulating valve is manufactured as a whole and the service performance of the flow channel is increased. At the same time, the manufacture of the labyrinth regulating valve based on the integrated additive manufacturing method can significantly improve the pressure resistance inside the flow channel, thereby being able to undertake pressure regulation tasks with higher parameters.

[0037] The above embodiments are merely illustrative of the principles and effects of the present application, and are not intended to limit the present application. Anything within the technical concept disclosed in the present application, and any simple replacement or change based on the technical solution of the present application, shall fall within the protection scope of the present application.

Claims

1. A method for manufacturing a labyrinth regulating valve based on additive manufacturing, characterized in that: The following steps are involved: S1. Modeling a three-dimensional model of the labyrinth regulating valve; S2. Adding alloy powder with the same composition as the regulating valve into a 3D printer to form a stainless steel alloy powder bed, using the laser in the 3D printer as a heat source to melt the surface powder, thereby determining the layer thickness parameters of 3D printing; S3. Use 3D printing slicing software to slice the 3D model; S4. 3D printing is performed according to the three-dimensional model of the regulating valve. After one layer of flow channel (1) is printed, the laser head is moved to the flow channel (1) area, and the surface of the flow channel (1) is remelted and laser strengthened by emitting light. After ten layers of printing are completed, the area above the flow channel (1) is covered with a thin plate (2) having the same shape as the edge of the flow channel (1); S5. Repeat S4 until the regulating valve printing is completed.

2. The method for manufacturing a labyrinth regulating valve based on additive manufacturing according to claim 1, characterized in that: The alloy powder is austenitic stainless steel powder, and the alloy powder particle size ranges from 30 to 80 μm.

3. The method for manufacturing a labyrinth regulating valve based on additive manufacturing according to claim 2, characterized in that: The laser power is selected to be 300W.

4. The method for manufacturing a labyrinth regulating valve based on additive manufacturing according to claim 3, characterized in that: The layer thickness of the 3D printing is 0.3 mm, and the formed base material melting depth is 0.5-0.8 mm.

5. The method for manufacturing a labyrinth regulating valve based on additive manufacturing according to claim 4, characterized in that: The laser power of the remelting and laser strengthening is 150W.

6. The method for manufacturing a labyrinth regulating valve based on additive manufacturing according to claim 5, characterized in that: The thin plate (2) is formed by straight cutting using wire cutting.

7. The method for manufacturing a labyrinth regulating valve based on additive manufacturing according to claim 6, characterized in that: The thickness of the thin plate (2) is selected to be 0.5 mm; the layer thickness interval of the thin plate is 3.5 mm, forming a flow channel isolation layer.

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