CN-121997593-A - Planning method for composite manufacturing process of increasing and decreasing materials for structural features of primitive flow channels

CN121997593ACN 121997593 ACN121997593 ACN 121997593ACN-121997593-A

Abstract

The invention discloses a planning method of an increase-decrease material composite manufacturing procedure for primitive runner structural features, which comprises the steps of S1 analyzing a runner characteristic structure, optimizing runner for increase-decrease material composite manufacturing, splitting a multi-runner structure into a plurality of single-runner structures, S2 setting a machining strategy for each single runner to be machined one by one, machining the single-runner material-increasing machining strategy along a shape mandrel, S3 developing a collision detection algorithm for increasing and decreasing material machining of the runner, circularly solving a machining area division plane along the shape mandrel of the runner by using the collision detection algorithm to obtain a runner increase-decrease alternating area division scheme, S4 generating specific material increasing and material decreasing machining procedures, S5 generating machining codes by post-treatment, and guiding the machining codes into an increase-decrease material composite manufacturing device for machining. The invention can rapidly and efficiently obtain the procedure planning result with no collision and high processing efficiency.

Inventors

LI LEI
LIU YANLEI
GAO WENLONG
HUO CHUNSEN
SHAO WEI
MA HAIKUAN
LIU JIKAI
ZOU BIN

Assignees

山东大学

Dates

Publication Date: 20260508
Application Date: 20260126

Claims (8)

1. A planning method of an increase-decrease material composite manufacturing procedure for primitive runner structural features is characterized by comprising the following steps: S1, analyzing a characteristic structure of a runner, manufacturing an optimized runner by compounding materials, and splitting a multi-runner structure into a plurality of single-runner structures; s2, setting a machining strategy to machine each single channel one by one, wherein the single channel material-increasing machining strategy is to machine along a shape mandrel; S3, circularly solving a processing area dividing plane along the channel-shaped mandrel by using a collision detection algorithm to obtain a channel increasing and decreasing alternative area dividing scheme; s4, generating specific additive and subtractive machining procedures; S5, post-processing to generate a processing code, and introducing the processing code into an increase-decrease material composite manufacturing device for processing.
2. The method for planning the composite manufacturing process of the increase and decrease material for the structural features of the primitive flow channels according to claim 1, wherein the process for analyzing the characteristic structure of the flow channels comprises optimizing the geometric features of the flow channels for composite manufacturing of the increase and decrease material, changing the bending flow channels from right-angle bending into arc transition forms, and splitting the multi-flow channel structure into a plurality of single-flow channel structures comprising a main flow channel and a secondary flow channel.
3. The method for planning the composite manufacturing process of the increase and decrease material facing the structural characteristics of the primitive flow channels according to claim 1, wherein the process of setting the machining strategy comprises the steps of machining each single flow channel one by one, machining the additive along a shape mandrel in the machining direction, and meeting the unsupported constraint of the inner wall of the flow channel.
4. The method for planning the composite manufacturing process of the incremental and incremental materials for the structural features of the primitive runner according to claim 1 is characterized in that the process of using a collision detection algorithm comprises the steps of developing the collision detection algorithm by using a programming language, importing a molded part model and a nozzle/tool model into the same coordinate system, importing coordinates (x, y, z) of a machining point and a corresponding centroid axis vector t for obtaining a model of the nozzle at any machining position, importing coordinates (x, y, z) of the machining point and the corresponding centroid axis vector t, setting a tool roll angle theta and a normal vector n of a plane in which a tool rotates for obtaining the model of the tool at any machining position, judging whether the nozzle/tool model intersects the molded part model to judge whether collision occurs, setting a dividing plane perpendicular to the centroid at the collision position, and circularly solving to obtain a machining area dividing scheme with the minimum number of segments.
5. The method for planning the composite manufacturing process of the increase and decrease material for the structural features of the primitive flow channels according to claim 1, wherein the process for generating the specific additive and subtractive material processing process comprises the steps of planning the process according to a regional division scheme by adopting process planning software, offsetting a certain distance between the inner wall and the outer wall of each divided sectional flow channel and the end face to serve as processing allowance, and removing the allowance during subtractive material processing.
6. The method for planning the composite manufacturing process of the increased or decreased material for the structural features of the primitive flow channels according to claim 1, wherein the material reduction processing process comprises the steps of surface milling to remove end face offset allowance, inner wall milling to remove inner wall offset allowance, outer wall milling to remove outer wall offset allowance and hole milling to obtain a complete flow channel for a cross flow channel area.
7. The method for planning the composite manufacturing procedure of the increase and decrease material for the structural features of the primitive flow channels according to claim 1 is characterized in that the post-treatment process comprises the steps of matching proper five-axis composite manufacturing equipment of the increase and decrease material, generating an actual machining code, and operating a machine tool to execute the code to finish machining.
8. The method for planning the composite manufacturing process of the incremental and decremental materials for the structural features of the primitive flow channels according to claim 1, further comprising adding an auxiliary flow channel, wherein the auxiliary flow channel is formed by downward biasing a certain distance and is used for avoiding collision between a spray head/cutter and a machine tool base during five-axis machining.

Description

Planning method for composite manufacturing process of increasing and decreasing materials for structural features of primitive flow channels Technical Field The invention belongs to the technical field of composite manufacturing of increased and decreased materials, and particularly relates to a planning method of composite manufacturing procedures of increased and decreased materials for structural features of primitive flow channels. Background The flow channel structure refers to a pipeline for conveying fluid medium in a hydraulic system and is an important component of a hydraulic element. The runner structure in the components such as the traditional hydraulic integrated block is obtained by drilling in a machining mode, process machining holes are formed in the positions such as turning and intersection of the runner, a large amount of redundant materials which are not removed exist, so that the runner structure under the traditional machining has the problems of large quality and pressure loss, and the efficiency of a hydraulic system is affected. Therefore, the current runner structure of the hydraulic system needs to be improved in design and manufacture so as to meet the requirements of the high-end equipment fields such as aerospace, robots, engineering machinery and the like. The composite manufacturing of the material increase and decrease is an emerging processing technology, combines the advantages of high degree of freedom of additive manufacturing and molding and good processing quality of material decrease manufacturing, and can be used for processing high-precision parts with complex shapes. The runner structure is processed by adopting the composite manufacturing technology of increasing and decreasing materials, so that a large amount of redundant materials can be avoided, and the weight of the hydraulic system is greatly reduced. Meanwhile, the processing flow passage of the material increasing and decreasing composite manufacturing technology can avoid the occurrence of process holes, and is beneficial to reducing the pressure loss of the flow passage. However, the runner structure is a complex structure with an inner cavity, and when the complex structure is processed by adopting the composite manufacturing technology of increasing and decreasing materials, the complex structure needs to strictly meet the technological constraint during processing, and mainly comprises that the inner wall of the runner cannot be supported and collision interference needs to be avoided during the processing. The current material increasing and decreasing process planning method is highly dependent on manual means to divide processing areas, and is difficult to obtain a process planning result with high processing efficiency and no collision. Disclosure of Invention In order to solve the technical problem of the existing material increasing and decreasing process planning method, the invention provides a material increasing and decreasing composite manufacturing process planning method facing to the structural characteristics of primitive flow channels, which comprises the following steps: S1, analyzing a characteristic structure of a runner, manufacturing an optimized runner by compounding materials, and splitting a multi-runner structure into a plurality of single-runner structures; s2, setting a machining strategy to machine each single channel one by one, wherein the single channel material-increasing machining strategy is to machine along a shape mandrel; S3, circularly solving a processing area dividing plane along the channel-shaped mandrel by using a collision detection algorithm to obtain a channel increasing and decreasing alternative area dividing scheme; s4, generating specific additive and subtractive machining procedures; S5, post-processing to generate a processing code, and introducing the processing code into an increase-decrease material composite manufacturing device for processing. Optionally, the process of analyzing the flow channel characteristic structure comprises the steps of manufacturing optimized flow channel geometric characteristics facing to material increase and decrease compounding, changing the bending flow channel from right-angle bending to arc transition, and splitting the multi-flow channel structure into a plurality of single-flow channel structures comprising a main flow channel and an auxiliary flow channel. Optionally, the process of setting the processing strategy comprises the steps of processing each single flow channel one by one, processing the material adding direction along the shape mandrel to meet the requirement that the inner wall of the flow channel is free from supporting constraint, dividing each layer in the material adding process of the flow channel by a plane perpendicular to the shape mandrel, and enabling any point on the flow channel to correspond to a tangential vector t on the shape mandrel. Optionally, the process of using the collisi