Intake duct optimization process breakdown method

Abstract

This invention relates to a method for optimizing the process breakdown of an air intake duct, comprising the following steps: 1) extracting the inner surface of the air intake duct to be processed, and creating an inner envelope based on the inner surface; 2) creating the projection of the envelope onto the processing direction; 3) drawing the upper and lower edges of the projection of the outer surface of the envelope onto the processing direction; 4) stretching the upper and lower edges into sufficiently long extruded surfaces in the processing direction; 5) extracting the intersection lines of the extruded surfaces on both sides with the envelope; 6) stretching the two intersection lines along the perpendicular processing direction to form two boundary surfaces; 7) dividing the air intake duct to be processed into two parts using the two boundary surfaces; 8) machining the two process-split parts of the air intake duct to be processed using a three-axis CNC machine tool without negative angle. This method for optimizing the process breakdown of an air intake duct can perform process breakdown for most inner surfaces of air intake ducts, and the two split parts can be machined separately using a three-axis CNC machine tool, shortening the processing cycle of the project.

Description

Technical Field

[0001] This invention relates to a method for optimizing the process of an air intake, belonging to the technical field of efficient processing of low-speed and high-speed wind tunnel models. Background Technology

[0002] In the process of machining low-speed and high-speed wind tunnel models, we often encounter inlet models with complex internal surfaces, which are difficult to machine using conventional machining methods. Some simpler models can be machined using five-axis CNC machine tools. However, some complex inlet models often cannot be machined accurately using five-axis machining alone, requiring subsequent electrical discharge machining (EDM) to remove the excess material that cannot be machined on five-axis. To ensure machining accuracy and timeliness, and to guarantee on-time project delivery, the inlet model is often disassembled into several parts. These parts are then assembled to complete the experimental task. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an intake duct optimization process splitting method. This intake duct optimization process splitting method can split the process for most intake duct internal surfaces. The two split parts can be machined by three-axis CNC respectively. After machining, they can be directly assembled without the need for subsequent supplementary machining methods such as EDM, thus shortening the project processing cycle.

[0004] To solve the above problems, the specific technical solution of the present invention is as follows: A method for decomposing the optimization process of an air intake duct, comprising the following steps:

[0005] 1) Extract the inner surface of the intake manifold to be processed, and create an inner envelope based on the inner surface;

[0006] 2) Create the projection of the envelope in the machining direction;

[0007] 3) Draw the upper and lower edges of the outer surface of the envelope body projected in the machining direction;

[0008] 4) Stretch the top and bottom edges into a sufficiently long stretched surface in the machining direction;

[0009] 5) Extract the intersection lines between the stretched surfaces on both sides and the envelope;

[0010] 6) Stretch the two intersection lines along the direction perpendicular to the machining to form two boundary surfaces;

[0011] 7) Divide the intake duct to be processed into two parts using two dividing surfaces;

[0012] 8) The intake duct to be processed is divided into two process-split parts, which are then machined without negative angles using a three-axis CNC machine tool.

[0013] Application of intake duct optimization process decomposition method in process decomposition of complex internal curved surfaces.

[0014] The intake manifold optimization process breakdown method of the present invention has the following advantages when using the above method:

[0015] 1) Optimized machining of the inner surface of the air intake greatly reduces the machining difficulty of the air intake and shortens the machining time;

[0016] 2) This method can be used not only for the internal machining of the air intake, but also for the splitting process of other complex internal surfaces. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall model of the intake duct to be processed in the embodiment.

[0018] Figure 2 This is a diagram of the envelope structure.

[0019] Figure 3 This is a projection of the envelope in the vertical machining direction.

[0020] Figure 4 This is a diagram showing the intersection of the outer surface of the envelope and the projection.

[0021] Figure 5 This is a stretched surface diagram of the edge line stretched in the machining direction.

[0022] Figure 6 This is a diagram showing the intersection of the stretched surface and the envelope.

[0023] Figure 7 This is a boundary surface diagram of the intersection line stretched along the perpendicular processing direction.

[0024] Figure 8 A schematic diagram of the airway segmentation using a boundary surface.

[0025] Figure 9 This is a schematic diagram of the airway structure after it has been split.

[0026] Wherein, 1-inner surface; 2-envelope; 3-outer surface of the envelope; 4-upper edge; 5-lower edge; 6-extended surface; 7-intersection line; 8-decomposed surface; Detailed Implementation

[0027] To further illustrate the technical solution of the intake duct optimization process breakdown method of this application, this embodiment uses a simple model for example. Figure 1 The example model shown is used for machining the inner surface of a curved surface, with the vertical direction as the machining direction; the outer surface has no effect. The process includes the following steps:

[0028] 1) Extract the inner surface 1 of the intake manifold to be processed, and create an inner envelope 2 based on the inner surface, such as... Figure 2 As shown;

[0029] 2) Create the projection of the envelope volume in the vertical machining direction, such as... Figure 3 As shown;

[0030] 3) Draw the upper edge line 4 and lower edge line 5 of the outer shape surface of the envelope body projected in the processing direction, such as... Figure 4 As shown;

[0031] 4) Stretch the upper edge 4 and lower edge 5 into a sufficiently long stretched surface 6 in the machining direction, such as... Figure 5 As shown;

[0032] 5) Extract the intersection lines 7 of the stretched surfaces 6 and the envelope 2 on both sides, as follows: Figure 6 As shown;

[0033] 6) Stretch the two intersection lines 7 along the perpendicular processing direction to form two boundary surfaces 8, such as... Figure 7 As shown;

[0034] 7) Divide the intake duct to be processed into two parts using two boundary surfaces, such as... Figure 8 As shown;

[0035] 8) The intake duct to be processed is divided into two process-split parts, A and B, such as... Figure 9 As shown, it is machined without negative angle using a three-axis CNC machine tool.

[0036] The intake manifold optimization process breakdown method of this application is not only applicable to the machining of the inner surface of the intake manifold, but also applicable to the process breakdown of other products in the machining of complex inner curved surfaces.

Claims

1. An air intake path optimization process split method, characterized by The method comprises the following steps: 1) extracting the inner profile in the processing profile of the intake port to be processed, and creating an inner envelope according to the inner profile; 2) creating a projection of the envelope in the processing direction; 3) depicting the upper edge line and the lower edge line of the projection of the outer profile of the envelope in the processing direction; 4) stretching the upper edge line and the lower edge line in the processing direction to a sufficient length of a stretching surface; 5) extracting the intersection lines of the stretching surfaces on both sides and the envelope, respectively; 6) stretching the two intersection lines along the vertical processing direction to form two boundary surfaces, respectively; 7) dividing the intake port to be processed into two parts by using the two boundary surfaces; 8) processing the two process split parts of the intake port to be processed by a three-axis numerical control machine tool without negative angle.

2. Application of the intake port optimization process split method in claim 1 in the process split of a complex inner profile.

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