Additive manufacturing part edge protection structure and method in high-frequency vibration finishing machining

Abstract

The invention provides an additive manufacturing part edge protection structure and method in high-frequency vibration finishing machining, belongs to the technical field of metal additive manufacturing part machining, and aims at achieving the purpose that in the high-frequency vibration finishing machining process, edge margins are increased in an edge area with the large abrasion loss of a part body and the part are subjected to integrated additive manufacturing machining. When the obtained to-be-machined part is subjected to subsequent high-frequency vibration finishing machining, only the edge protection structure is abraded, and therefore the part body is protected. According to the method, the edge integrity of the additive manufacturing grating parts in the high-frequency vibration finishing machining process can be effectively protected, excessive machining and damage to the edges are reduced, and the size precision and surface quality of the parts are improved; by reasonably designing an edge protection structure and optimizing process parameters, efficient finishing machining of a part machining area can be achieved while the edge protection effect is guaranteed, the machining efficiency is improved, and the machining cost is reduced.

Description

Technical Field

[0001] This invention belongs to the field of metal additive manufacturing parts processing technology, and relates to an edge protection structure and method for additive manufacturing parts in high-frequency vibration finishing. Background Technology

[0002] With the rapid development of additive manufacturing technology, grid-type parts have been widely used. However, the surface of grid-type parts after additive manufacturing often has problems such as high roughness and large residual stress. Aerospace and other fields have high requirements for the surface roughness of additively manufactured parts, making subsequent finishing of metal additively manufactured parts indispensable to improve their surface quality and service performance, and to ensure that the quality of the parts meets the requirements for use.

[0003] High-frequency vibration finishing is an effective method for reducing the surface roughness of additively manufactured parts, exhibiting high finishing efficiency. This technology has already been applied to various aerospace components. However, during processing, due to the randomness of the high-frequency vibrating abrasive's movement in the processing medium and edge effects, the edges of grid-like parts are prone to over-processing or damage, affecting the dimensional accuracy and overall performance of the parts. Traditional edge protection methods suffer from drawbacks such as poor protection effectiveness, complex operation, or inapplicability to the special structures of grid-like parts. Therefore, there is an urgent need for a dedicated edge protection method for high-frequency vibration finishing of additively manufactured grid-like parts, enabling low-cost, high-efficiency, and consistent quality processing of additively manufactured metal parts. This method has significant research and application value. Summary of the Invention

[0004] The purpose of this invention is to provide an edge protection structure and method for additive manufacturing parts in high-frequency vibration finishing, so as to solve the problem of insufficient edge protection in the prior art when performing high-frequency vibration finishing on grid-type parts.

[0005] The technical solution adopted in this invention is as follows:

[0006] An edge protection structure for additive manufacturing parts in high-frequency vibration finishing is disclosed. This edge protection structure is an added edge allowance in the edge areas of the part body with high wear during high-frequency vibration finishing. It is integrated with the part in additive manufacturing, so that when the resulting part undergoes subsequent high-frequency vibration finishing, only the edge protection structure wears, thus protecting the part body. Specifically:

[0007] The edge protection structure includes an inner protection line 1 and an outer protection line 2. The inner protection line 1 is a margin reserved along the entire edge of the part, with a width of 0.5-2.5mm and a cross-sectional shape that is concave in the middle. The outer protection line 2 is set in the corner area of ​​the part, with a further margin on the basis of the inner protection line 1, a width of 1-2mm, and a cross-sectional shape that is the same as the inner protection line 1. The inner protection line 1 and the outer protection line 2 are connected at the concave corner 3, and the outer protection line 2 is connected at the corner 4, which is also a concave corner.

[0008] Furthermore, the widths of the inner protective line 1 and the outer protective line 2 are determined based on the geometry of the part, dimensional tolerance requirements, and additive manufacturing process parameters.

[0009] A method for edge protection of additive manufacturing parts in high-frequency vibration finishing includes the following steps:

[0010] Step 1: Preprocess the part model by adding an edge protection structure to the part body.

[0011] Step 2: Based on the part model with added edge protection structure, perform integrated additive manufacturing to obtain the part to be processed.

[0012] Step 3: Determine the high-frequency vibration finishing process parameters, adjust the processing path planning, perform high-frequency vibration finishing on the parts to be processed, and control the processing process to protect the parts to the greatest extent.

[0013] Step 4: Perform post-processing on the parts after high-frequency vibration finishing to obtain parts with edge dimensional accuracy and surface quality that meet the requirements.

[0014] Furthermore, step 1 specifically involves: acquiring the three-dimensional model data of the part, analyzing the model data and roughness data to determine the area requiring finishing and the edge protection range; and adding an edge protection structure to the part to protect its edges based on the part's geometry, dimensional tolerance requirements, and additive manufacturing process parameters.

[0015] Furthermore, in step 3, the process of determining the high-frequency vibration finishing process parameters is as follows: based on the material properties and structural characteristics of the part, as well as the performance of the high-frequency vibration finishing equipment, determine appropriate vibration frequency, amplitude, abrasive type and particle size, processing time, and other process parameters; at the same time, based on the size and shape of the edge protection structure, adjust the processing path planning to ensure that during the finishing process, the abrasive flow mainly acts on the edge protection structure, while the impact on the part is controlled within a minimum range.

[0016] Furthermore, in step 3, the high-frequency vibration finishing process is as follows: the part to be processed is fixed in the processing fixture, the equipment is started according to the predetermined processing path and process parameters, and high-frequency vibration finishing is performed; the changes in parameters such as force and temperature during the processing are monitored in real time, and when abnormal fluctuations in parameters are found that may affect the integrity of the edge protection structure, the processing parameters are adjusted in time or corresponding protective measures are taken, such as adjusting the abrasive flow rate or changing the vibration direction.

[0017] Furthermore, in step 4, the post-processing process is as follows: after completing the high-frequency vibration finishing process, the parts are cleaned to remove residual abrasive and impurities; then the edges of the parts are inspected, and if there is any minor damage or deformation, appropriate repair processes are used to repair it, such as micro-grinding, laser repair, etc., to ensure that the dimensional accuracy and surface quality of the parts edges meet the requirements.

[0018] The beneficial effects of this invention are as follows:

[0019] (1) The present invention can effectively protect the edge integrity of additive manufacturing grid parts during high-frequency vibration finishing, reduce excessive processing and damage to the edges, and improve the dimensional accuracy and surface quality of the parts.

[0020] (2) By rationally designing the edge protection structure and optimizing the process parameters, it is possible to achieve efficient finishing of the part processing area while ensuring the edge protection effect, thereby improving processing efficiency and reducing processing costs.

[0021] (3) The present invention has good versatility and operability, and is applicable to additive manufacturing grid parts of different shapes, sizes and materials. It provides a simple and reliable edge protection technology solution for the post-processing of additive manufacturing parts, which helps to promote the widespread application of additive manufacturing technology in more fields. Attached Figure Description

[0022] Figure 1 A schematic diagram of an additive manufacturing part with a reserved edge protection structure.

[0023] Figure 2 This is a schematic diagram of the edge protection structure, where (a) is a magnified view and (b) is a partial view. Figure 1 The main view.

[0024] Figure 3 for Figure 1 A sectional view.

[0025] In the diagram: 1. Inner protective line; 2. Outer protective line; 3. Inside corner; 4. Outside corner. Detailed Implementation

[0026] The present invention will be further described below using an additively manufactured aluminum alloy grating part of a certain product as an example. The additively manufactured aluminum alloy grating part has a hexagonal structure.

[0027] An edge protection structure for additively manufactured parts in high-frequency vibration finishing, such as Figures 1 to 3 The edge protection structure is an added edge allowance in the edge area of ​​the aluminum alloy grid part with large wear during high-frequency vibration finishing. It is integrated with the part in additive manufacturing, so that when the part is subsequently subjected to high-frequency vibration finishing, only the edge protection structure is worn, thus protecting the part body. Specifically, it includes an inner protection line 1 and an outer protection line 2. The inner protection line 1 is a allowance reserved along the entire edge of the aluminum alloy grid part, with a width of 0.5-2.5mm and a cross-sectional shape that is concave in the middle. The outer protection line 2 is set in the six corner areas of the aluminum alloy grid part, a total of 6 lines. It further increases the allowance based on the inner protection line 1, with a width of 1-2mm and the same cross-sectional shape as the inner protection line 1. The concave angle 3 at the junction of the inner protection line 1 and the outer protection line 2, and the convex angle 4 at the six corners of the outer protection line 2, are also controlled by guide angles.

[0028] A method for edge protection of additive manufacturing parts in high-frequency vibration finishing includes the following steps:

[0029] Step 1: Preprocess the aluminum alloy grille part model by adding an edge protection structure to the aluminum alloy grille part body.

[0030] Obtain the 3D model data of the aluminum alloy grille parts, analyze the model data and roughness data to determine the areas that need to be finished and the edge protection range; according to the geometry, dimensional tolerance requirements and additive manufacturing process parameters of the aluminum alloy grille parts, add edge protection structures to the aluminum alloy grille parts to protect the edges of the aluminum alloy grille parts, wherein the width of the inner protection line 1 is set to 1mm and the width of the outer protection line 2 is set to 1.5mm.

[0031] Step 2: Based on the aluminum alloy grille-like part model with added edge protection structure, perform integrated additive manufacturing to obtain the part to be processed.

[0032] Step 3: Determine the high-frequency vibration finishing process parameters, adjust the processing path planning, perform high-frequency vibration finishing on the parts to be processed, and control the processing process to protect the parts to the greatest extent.

[0033] The process for determining the parameters of high-frequency vibration finishing is as follows: Based on the characteristics of aluminum alloy materials, structural features, and the performance of the high-frequency vibration finishing equipment, the vibration frequency is determined to be 1000 Hz, ceramic-based abrasive with a particle size of 8-10 mm is selected, and the processing time is 6 hours. At the same time, the processing path is adjusted according to the size and shape of the edge protection structure to ensure that during the finishing process, the abrasive flow mainly acts on the edge protection structure, while the impact on the parts is controlled to a minimum.

[0034] The high-frequency vibration finishing process is as follows: the part to be processed is fixed in the processing fixture, the equipment is started according to the predetermined processing path and process parameters, and high-frequency vibration finishing is performed; the processing dimension removal amount and temperature change during the processing are monitored in real time. When abnormal fluctuations in parameters are found that may affect the integrity of the edge protection structure, the processing parameters are adjusted in time or corresponding protective measures are taken, including adjusting the abrasive flow rate and changing the vibration direction.

[0035] Step 4: After high-frequency vibration finishing, the aluminum alloy grid parts are post-processed to obtain aluminum alloy grid parts with edge dimensional accuracy and surface quality that meet the requirements.

[0036] After high-frequency vibration finishing, the aluminum alloy grid parts are cleaned to remove residual abrasive and impurities. Then, the edges of the aluminum alloy grid parts are inspected. If there is any minor damage or deformation, micro-grinding is used to repair it to ensure that the dimensional accuracy and surface quality of the edges of the aluminum alloy grid parts meet the requirements.

[0037] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the claims of this application.

Claims

1. An edge protection structure for additively manufactured parts in high-frequency vibration finishing, characterized in that, The edge protection structure is an added edge allowance in the edge area with large wear of the part body during high-frequency vibration finishing. It is integrated with the part for additive manufacturing. When the part to be processed is subsequently subjected to high-frequency vibration finishing, only the edge protection structure is worn, thereby protecting the part body.

2. The edge protection structure for additive manufacturing parts in high-frequency vibration finishing according to claim 1, characterized in that, The edge protection structure includes an inner protection line (1) and an outer protection line (2). The inner protection line (1) is a margin reserved along the entire edge of the part, and its cross-sectional shape is an arc with a concave center. The outer protection line (2) is set in the corner area of ​​the part, and the margin is further increased on the basis of the inner protection line (1). Its cross-sectional shape is the same as that of the inner protection line (1).

3. The edge protection structure for additive manufacturing parts in high-frequency vibration finishing according to claim 2, characterized in that, The inner protective line (1) has a width of 0.5-2.5 mm, and the outer protective line (2) has a width of 1-2 mm.

4. The edge protection structure for additive manufacturing parts in high-frequency vibration finishing according to claim 2, characterized in that, The inner corner (3) where the inner protective line (1) and the outer protective line (2) meet is a guide angle, and the outer corner (4) at the corner of the outer protective line (2) is also a guide angle.

5. The edge protection structure for additive manufacturing parts in high-frequency vibration finishing according to claim 2, characterized in that, The widths of the inner protective line (1) and the outer protective line (2) are determined according to the geometry of the part, dimensional tolerance requirements and additive manufacturing process parameters.

6. A method for edge protection of additively manufactured parts in high-frequency vibration finishing, implemented based on the edge protection structure described in any one of claims 1-5, characterized in that, Includes the following steps: Step 1: Preprocess the part model by adding an edge protection structure to the part body. Step 2: Based on the part model with added edge protection structure, perform integrated additive manufacturing to obtain the part to be processed; Step 3: Determine the high-frequency vibration finishing process parameters, adjust the processing path planning, perform high-frequency vibration finishing on the parts to be processed, and control the processing process; Step 4: Perform post-processing on the parts that have undergone high-frequency vibration finishing.

7. The method for edge protection of additive manufacturing parts in high-frequency vibration finishing according to claim 6, characterized in that, Step 1 specifically involves: acquiring the three-dimensional model data of the part, analyzing the model data and roughness data to determine the area requiring finishing and the edge protection range; and adding an edge protection structure to the part based on its geometry, dimensional tolerance requirements, and additive manufacturing process parameters.

8. A method for edge protection of additive manufacturing parts in high-frequency vibration finishing according to claim 6, characterized in that, In step 3, the process of determining the high-frequency vibration finishing process parameters is as follows: the process parameters are determined based on the material properties, structural characteristics of the part and the performance of the high-frequency vibration finishing equipment; at the same time, the processing path planning is adjusted according to the size and shape of the edge protection structure.

9. A method for edge protection of additive manufacturing parts in high-frequency vibration finishing according to claim 6, characterized in that, In step 3, the high-frequency vibration finishing process is as follows: the part to be processed is fixed in the processing fixture, the equipment is started according to the predetermined processing path and process parameters, and high-frequency vibration finishing is performed; parameter changes are monitored in real time, and when abnormal fluctuations in parameters are detected, the processing parameters are adjusted in a timely manner or protective measures are taken.

10. A method for edge protection of additive manufacturing parts in high-frequency vibration finishing according to claim 6, characterized in that, In step 4, the post-processing process is as follows: after completing the high-frequency vibration finishing process, the parts are cleaned to remove residual abrasive and impurities; the edges of the parts are inspected, and if there is damage or deformation, a repair process is used to repair it.

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