CN-121980697-A - Model automatic generation method for SLM forming and shape control process rib plate structure

CN121980697ACN 121980697 ACN121980697 ACN 121980697ACN-121980697-A

Abstract

The invention discloses an automatic model generation method for an SLM forming and shape control process rib plate structure, which comprises the steps of marking a reference curve of a rib plate to be generated, setting rib plate parameters, generating a rib plate body model based on the reference curve and combining the set rib plate parameters, setting separation hole parameters, generating a sphere model based on the reference curve and combining the set separation hole parameters, and carrying out Boolean subtraction operation according to the rib plate body model and the sphere model to obtain a final rib plate model with separation holes. The method can realize one-key generation of the rib plate type process structure, greatly reduce modeling time of the rib plate type process structure, provide various selectable rib plate type process structure generation modes, flexibly select according to product structural characteristics and forming requirements, and have controllable and adjustable parameters, thereby solving a series of problems in the design of the SLM forming process structure in the existing modeling method based on boundary representation.

Inventors

DU JIE
PENG ZHIQUAN
YANG SANQIANG
ZHOU XINXIN
LI WEINING
LI JINGYANG
SHAO HANG
QI JUNFENG
JIANG KUN
JIN LIANG
WANG YINGCHAO
DENG HAO

Assignees

北京卫星制造厂有限公司

Dates

Publication Date: 20260505
Application Date: 20251231

Claims (10)

1. The automatic model generation method for the SLM forming and shape control process rib plate structure is characterized by comprising the following steps of: Marking a reference curve of a rib plate to be generated; Setting rib plate parameters; based on the reference curve, combining the set rib plate parameters to generate a rib plate body model; Setting parameters of the separation holes; Based on the reference curve, combining the set separation hole parameters to generate a sphere model; And carrying out Boolean subtraction operation according to the rib plate body model and the sphere model to obtain a final rib plate model with separation holes.
2. The automatic model generating method for the rib plate structure of the SLM forming and shape controlling process according to claim 1 is characterized in that marking the reference curve of the rib plate to be generated comprises the steps of identifying the contour curve of a product and marking the contour curve as the reference curve of the rib plate to be generated, or creating a curve attached to the surface of the product and marking the curve as the reference curve of the rib plate to be generated.
3. The automatic model generating method for the SLM forming and shape controlling process rib plate structure, which is characterized by comprising the steps of defining a closed curve of a generating direction or an opening area of a rib plate to be generated according to the type of the rib plate to be generated, and setting the thickness a, the secondary reinforcing thickness b, the cross rib reinforcing threshold c and the embedding depth d of the rib plate to be generated respectively.
4. The automatic model generating method for the SLM forming and shape controlling process rib plate structure according to claim 3 is characterized in that the types of rib plates to be generated comprise vertical side face shape maintaining rib plates, bottom edge supporting rib plates and window edge supporting rib plates, wherein the vertical side face shape maintaining rib plates are rib plates extending outwards at the side edges of a product to support and control shapes, the bottom edge supporting rib plates are rib plates which grow layer by layer from a base plate and are finally connected with the product to be supported and formed, and the window edge supporting rib plates are rib plates which are used for conducting closing treatment on an opening model inside the product to prevent buckling deformation of the opening model.
5. The automatic model generating method for the SLM forming and shape controlling process rib plate structure according to claim 4 is characterized in that a generating direction of the rib plate to be generated or a closed curve of an opening area is defined according to the type of the rib plate to be generated, wherein the method comprises the steps of defining the generating direction of the rib plate to be generated if the rib plate to be generated is a vertical side face shape preserving rib plate or a bottom edge supporting rib plate, and marking the closed curve of the opening area if the rib plate to be generated is a window edge supporting rib plate.
6. The automatic model generating method for the rib plate structure of the SLM forming and shape controlling process according to claim 3, wherein the thickness a, the secondary reinforcing thickness b, the cross rib reinforcing threshold c and the embedding depth d of the rib plate to be generated are respectively set according to the following principle: A is more than or equal to 0.6mm and less than or equal to 1.0mm, and a is less than or equal to A 2a≤b≤5a c=H/a D is more than or equal to 3 and less than or equal to 10D, and D is less than or equal to A Wherein A represents the thickness of the skin, H represents the height of the rib plate to be formed, and D represents the thickness of the printing layer.
7. The automatic model generating method for the SLM forming and shape controlling process rib plate structure according to claim 3, wherein the rib plate body model is generated based on a reference curve and combined with set rib plate parameters, the method comprises the steps of carrying out vector calculation according to space coordinates of differential points forming the reference curve, combined with defined generation directions or closed curves of opening areas and set a, b, c, d values to obtain end point coordinates of a rib plate body outline frame, inputting the end point coordinates into model generating software, and filling triangular patches to form the rib plate body model.
8. The automatic model generating method for the SLM forming and shape controlling process rib plate structure, which is characterized by comprising the steps of setting the aperture e of a separation hole, the hole spacing f and the spacing g between the separation hole and a product, wherein e is more than or equal to 1mm and less than or equal to 3mm, f is more than or equal to 2e and less than or equal to 4e, and g is more than or equal to 0.8e and less than or equal to 1.2e.
9. The automatic model generation method for the SLM forming and shape controlling process rib plate structure is characterized by combining set separation hole parameters based on a reference curve to generate a sphere model, and comprises the steps of performing offset calculation on differential points on the reference curve according to set values of e, f and g to obtain a separation hole distribution curve, performing array distribution calculation on the basis of the starting point of the separation hole distribution curve to obtain position information of separation hole positions, and filling the sphere model forming array distribution according to the separation hole distribution curve and the calculated position information of the separation hole positions.
10. The method for automatically generating models for the rib plate structure of the SLM forming and controlling process according to claim 1, further comprising the step of performing position fine adjustment on the two sphere models at the head end and the tail end according to actual conditions.

Description

Model automatic generation method for SLM forming and shape control process rib plate structure Technical Field The invention belongs to the technical field of metal additive manufacturing processes, and particularly relates to an automatic model generation method for an SLM forming and shape control process rib plate structure. Background In recent years, the metal additive manufacturing technology has been rapidly developed and widely applied in a plurality of fields, and particularly, the characteristics of functional integration, light structure and the like are increasingly prominent in the aerospace field. However, as additive manufactured parts continue to increase in size and structure become more complex, problems such as deformation, warpage, or cracking due to localized thermal stress build-up during printing become more pronounced. To suppress the occurrence of the above defects, a removable process structure is usually introduced during the manufacturing process to assist in forming, so as to ensure the smooth forming process. Currently, most process structures can be created with a high degree of automation by commercial software (e.g., MATERIALISE MAGICS). However, the software is limited in automatic generation function aiming at rib plate process structure models, firstly, the generation type is simple and single, complex and multi-type rib plate generation cannot be supported, secondly, the designability is insufficient, adjustable parameters are few, and errors or deviation expectations are easily generated in model generation. Therefore, the rib plate type process structure at the present stage still needs to adopt the traditional solid three-dimensional modeling software (such as Creo, UG and the like) based on boundary representation (B-rep) to carry out manual design, a great amount of time is consumed in the process to finish the operations of positioning a reference curve, repeated input of similar parameters and the like, the problems that the existing modeling software algorithm and the complex heterogeneous surfaces of the existing topology type products are limited are solved, the problems that contour curves of the heterogeneous appearance surfaces cannot be selected, separation holes cannot be generated in an array along a special curve and the like are easy to generate, the design modeling flow of the rib plate type process structure is extremely complex, and the rib plate type process structure becomes one of key factors for restricting the forming quality and efficiency of large-size and complex structural parts. Therefore, optimization of modeling methods of existing process rib plates is needed to improve reliability and economy of additive manufacturing. Disclosure of Invention The invention solves the problems of overcoming the defects of the prior art, providing an automatic model generation method for an SLM forming control process rib plate structure, and aiming at solving a series of problems in the design of the SLM forming process structure of the existing modeling method based on boundary representation (B-rep). In order to solve the technical problems, the invention discloses an automatic model generation method for a rib plate structure of an SLM forming and shape control process, which comprises the following steps: Marking a reference curve of a rib plate to be generated; Setting rib plate parameters; based on the reference curve, combining the set rib plate parameters to generate a rib plate body model; Setting parameters of the separation holes; Based on the reference curve, combining the set separation hole parameters to generate a sphere model; And carrying out Boolean subtraction operation according to the rib plate body model and the sphere model to obtain a final rib plate model with separation holes. In the model automatic generation method facing the SLM forming and shape control process rib plate structure, marking the reference curve of the rib plate to be generated comprises the steps of identifying the contour curve of a product and marking the contour curve as the reference curve of the rib plate to be generated, or creating a curve attached to the surface of the product on the surface of the product and marking the curve as the reference curve of the rib plate to be generated. In the model automatic generation method facing the SLM forming and shape control process rib plate structure, rib plate parameters are set, wherein the method comprises the steps of defining a closed curve of a generation direction or an opening area of a rib plate to be generated according to the type of the rib plate to be generated, and setting the thickness a, the secondary reinforcing thickness b, the cross rib reinforcing threshold c and the embedding depth d of the rib plate to be generated respectively. The model automatic generation method facing the SLM forming and shape control process rib plate structure comprises vertical side face shape preserving rib plate