CN111027248B - Automatic creation method and system for analysis model of local structure of injection mold - Google Patents
Automatic creation method and system for analysis model of local structure of injection mold Download PDFInfo
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Abstract
The invention discloses an automatic creation method and system of an injection mold local structure analysis model, which comprises the steps of simplifying an injection mold CAD model, and carrying out global structure analysis to obtain node information of all nodes of the model; further extracting main deformed nodes, endowing attribute labels to adjacent nodes around the main deformed nodes to generate smooth cutting surfaces, realizing automatic cutting of a global model, obtaining a local structure and finely dividing grids; placing the local structure in a global structure analysis model, and realizing the automatic addition of boundary displacement constraint of the local structure by matching displacement vectors with boundary surface nodes; and (3) for other constraints and loads on the local structure, the automatic update of the other constraints and loads is realized through a classification adding processing mode. The invention realizes the cutting of local structures, the addition of boundary displacement, other constraint and automatic calculation of load, improves the accuracy and timeliness of structural analysis, and is well applied to the structural analysis and optimization of the die.
Description
Technical Field
The invention relates to the field of injection mold design, in particular to an automatic creation method and system of an injection mold local structure analysis model.
Background
The injection mold is complex in structure and requires a large number of grid cells to be divided when performing structural analysis thereof. Too many grids put great stress on computation, typically employing a simplified model and partitioning the model into sparse grids reduces the number of grids. However, for some areas with greater stress strain, the sparse grid layout may not meet the accuracy requirements. For cavity areas with very high precision requirements, any errors can cause defects in product quality. So that when analyzing the structure of the mold, the region with larger local deformation must obtain more accurate analysis results to meet the actual production and processing requirements. The local structure analysis technology is adopted to analyze only the local part, so that the operation cost is saved and the operation precision is improved.
In the existing method, most of the components are extracted independently, stress and constraint states of the components are analyzed to further perform structural analysis of a local model, stress conditions of the components are different in different moulds, and the stress states and the constraint states of the components cannot be automatically identified and added during structural analysis. The local structure analysis provided by the method only carries out precise grid division on key areas such as the model cavity, sparse grids are adopted for other parts except the areas, automatic addition of load constraint of the local structure is realized, and accuracy and timeliness are both considered.
Disclosure of Invention
The invention aims to solve the technical problems that a large number of grid cells need to be divided in the prior art, and the added defects cannot be automatically identified in the stress state and the constraint state of the structural analysis, and provides an automatic creation method and an automatic creation system for a local structural analysis model of an injection mold.
The technical scheme adopted for solving the technical problems is as follows:
the automatic creation method of the injection mold local structure analysis model comprises the following steps:
s1, simplifying an injection mold CAD model, generating a simplified injection mold CAD model, performing global structural analysis on the simplified injection mold CAD model to obtain a stress strain result, and deriving node information of all nodes of the model;
s2, extracting main deformation nodes according to node information of all nodes of the model, endowing attribute labels to adjacent nodes around the main deformation nodes, clustering coordinate information of the nodes endowed with the attribute labels to generate smooth cutting surfaces, automatically cutting the global model to obtain a local structure, and finely dividing grids of the local structure;
s3, placing the local structure subjected to grid division in a global structure analysis model, and completing automatic addition of boundary displacement constraint of the local structure by matching displacement vectors with boundary surface nodes;
s4, adding other constraints and loads on the local structure through a classified adding processing mode, and automatically updating other preset constraints and loads on the local structure.
According to the technical scheme, the node information comprises a node global number, node coordinate information and a node strain amplitude, wherein the node global number is a unit ID for analyzing the die structure, the node coordinate information is x, y and z coordinate values of the node, and the node strain amplitude is a vector sum of strain values in x, y and z coordinate directions of the node.
By adopting the technical scheme, the extraction method of the main deformed node comprises the following steps: traversing the derived node information, wherein the node with the node strain amplitude larger than the strain threshold is the main deformation node.
In the above technical solution, the process of assigning attribute labels to neighboring nodes around the main deformed node in step S2 includes: firstly, adding a selected attribute to the derived node information, setting a default value to be 0, traversing the derived node information, setting the selected attribute value to be 1 for non-primary deformed nodes within a finite element mesh size from the primary deformed node, and marking the selected attribute value as boundary surface nodes.
In step S2, clustering the coordinate information of the node given with the attribute label to generate a smooth cutting surface means that: and generating a curved surface by using the coordinate information of the nodes and adopting B spline fitting.
In connection with the above technical solution, the step S3 of matching displacement vectors for boundary surface nodes includes the following steps:
s31, storing the boundary surface nodes into a plurality of objects, and setting a distance threshold radius;
s32, sequentially reading nodes in one array Object, reading non-main deformed nodes with selected attribute values of 0, calculating node distances, and giving the node displacement vector to the nodes in the read array Object when the node distances are smaller than a distance threshold radius;
s33, repeating S32 until nodes in the array Object are traversed.
By adopting the technical scheme, the other constraint and load refer to the other constraint comprising fixed constraint, contact constraint and distal constraint, and the other load comprises cavity pressure, mold locking force and bolt pretightening force.
In step S4, the adding of other constraints and loads on the local structure through the processing manner of classification addition specifically includes:
s41, constraint and load applied to the geometric body surface are directly added by traversing the CAD model to find the pairing surface of the geometric body;
s42, adding the constraint and the load applied to the grid cell surface to realize the constraint and the load addition of the local structure model by utilizing interpolation calculation after the local structure grid is repartitioned.
In step S42, the constraint and load addition to the local structure model are implemented by interpolation calculation as follows:
s421, a high-dimensional index tree-type data structure is established, and data of all surface nodes of the local structure are stored in the tree as three-dimensional point clouds;
s422, reading three vertexes A, B and C of any triangular grid M on the surface of the cavity, and sequentially finding three product surface nodes closest to the vertexes by utilizing a tree search nearest point algorithm, wherein the node corresponding to the point A is A 1 ，A 2 And A 3 The node corresponding to the point B is B 1 ，B 2 And B 3 The node corresponding to the point C is C 1 ，C 2 And C 3 ；
S423, calculating pressure values of three vertexes A, B and C, taking the point A as a starting point to A 1 ，A 2 And A 3 The triangle is formed to be perpendicular to obtain a foot A', and a triangle surface set S is calculated in sequence A’A1A2 ，S A’A1A3 ，S A’A2A3 ，S A1A2A3 The pressure value at point a is:
wherein P is A1 、P A2 、P A3 The pressure value calculation method of the fixed points B and C is the same as that of the fixed point A;
s424, calculating a pressure value on a triangular surface M, wherein the pressure value on the triangular surface M is the average value of the pressure values of three vertexes A, B and C, and the direction of the pressure is perpendicular to the triangular surface M outwards.
S425, sequentially performing the steps S422-S424 on all triangular grid units on the surface of the local structure, and thus, the automatic loading of the surface load of the local structure can be realized.
There is provided an injection mold local structure analysis model automatic creation system including:
the node information deriving module is used for simplifying the injection mold CAD model, generating a simplified injection mold CAD model, carrying out global structural analysis on the simplified injection mold CAD model to obtain a stress strain result, and deriving node information of all nodes of the model;
the automatic cutting module is used for extracting main deformation nodes according to node information of all nodes of the model, endowing attribute labels to adjacent nodes around the main deformation nodes, clustering coordinate information of the nodes endowed with the attribute labels to generate smooth cutting surfaces, automatically cutting the global model to obtain a local structure, and finely dividing grids of the local structure;
the boundary surface node constraint module is used for placing the local structure subjected to grid division in a global structure analysis model, and completing automatic addition of boundary displacement constraint of the local structure by matching displacement vectors with the boundary surface nodes;
and the local structure automatic updating module is used for adding other constraints and loads on the local structure through a classified adding processing mode and automatically updating other preset constraints and loads on the local structure.
The invention has the beneficial effects that: the invention improves the structural analysis accuracy and timeliness by cutting the local structure, adding the boundary displacement and automatically calculating other constraints and loads, and is well applied to the structural analysis and optimization of the die.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a flow chart of an implementation of the method of the present invention;
FIG. 2 is a schematic view of an injection mold constructed in accordance with an embodiment of the method of the present invention;
FIG. 3 is a diagram of a selected attribute tag assigned to a node in accordance with an embodiment of the present invention;
FIG. 4 is a schematic representation of the location of boundary surface nodes and non-primary deformed nodes in the practice of the method of the present invention;
FIG. 5 is a schematic diagram of an interpolation calculation method implemented by the method of the present invention;
fig. 6 is a block diagram of a system for implementing the method of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1, the present invention provides an automatic creation method of an analysis model of a local structure of an injection mold, comprising the steps of:
s1, simplifying an injection mold CAD model, generating a simplified injection mold CAD model, performing global structural analysis on the simplified injection mold CAD model to obtain a stress strain result, and deriving node information of all nodes of the model;
s2, extracting main deformation nodes according to node information of all nodes of the model, endowing attribute labels to adjacent nodes around the main deformation nodes, clustering coordinate information of the nodes endowed with the attribute labels to generate smooth cutting surfaces, automatically cutting the global model to obtain a local structure, and finely dividing grids of the local structure;
s3, placing the local structure subjected to grid division in a global structure analysis model, and completing automatic addition of boundary displacement constraint of the local structure by matching displacement vectors with boundary surface nodes;
s4, adding other constraints and loads on the local structure through a classified adding processing mode, and automatically updating other preset constraints and loads on the local structure.
A schematic diagram of an injection mill for practicing the method of the invention is shown in fig. 2. Simplifying a CAD model of the injection mold by adopting a conventional method, carrying out global structural analysis, obtaining a stress-strain analysis result through finite element calculation, and deriving node information; the local structure for accurate analysis is extracted separately from the global model. Automatically adding boundary displacement constraint of the local structure; and (3) for other constraints and loads on the local structure, the automatic update of the other constraints and loads is realized through a classification adding processing mode. Thereby realizing the automatic creation of the analysis model of the local structure of the injection mold.
Further, as shown in fig. 3, the node information includes a node global number, node coordinate information and a node strain amplitude, the node global number is a unit ID of the mold structure analysis, the node coordinate information is x, y and z coordinate values of the node, and the node strain amplitude is a vector sum of strain values in x, y and z coordinate directions of the node.
Further, the extraction method of the main deformed node comprises the following steps: traversing the derived node information, wherein the node with the node strain amplitude larger than the strain threshold is the main deformation node.
Further, as shown in fig. 3, the process of assigning attribute labels to neighboring nodes around the main deformed node in step S2 is as follows: firstly, adding a selected attribute to the derived node information, setting a default value to be 0, traversing the derived node information, setting the selected attribute value to be 1 for non-primary deformed nodes within a finite element mesh size from the primary deformed node, and marking the selected attribute value as boundary surface nodes.
Further, in step S2, clustering the coordinate information of the node to which the attribute tag is attached to generate a smooth cutting surface means: and generating a curved surface by using the coordinate information of the nodes and adopting B spline fitting.
Further, matching the displacement vector to the boundary surface node in step S3 includes the steps of:
s31, storing the boundary surface nodes into a plurality of objects, and setting a distance threshold radius;
s32, sequentially reading nodes in one array Object, reading non-main deformed nodes with selected attribute values of 0, calculating node distances, and giving the node displacement vector to the nodes in the read array Object when the node distances are smaller than a distance threshold radius;
s33, repeating S32 until nodes in the array Object are traversed.
As shown in fig. 4, the black node is the main deformed node, the node on the boundary is the boundary surface node with the attribute selected value of 1, and the white node outside the boundary is the non-main deformed node.
Further, other constraints and loads are meant to include fixed constraints, contact constraints, and distal constraints, and other loads include cavity pressure, clamping force, and bolt pretension.
Further, in step S4, the adding of other constraints and loads on the local structure through the processing manner of classification addition is specifically:
s41, constraint and load applied to the geometric body surface are directly added by traversing the CAD model to find the pairing surface of the geometric body;
s42, adding the constraint and the load applied to the grid cell surface to realize the constraint and the load addition of the local structure model by utilizing interpolation calculation after the local structure grid is repartitioned.
Further, the constraint and load addition to the local structure model in step S42 by interpolation calculation is specifically as follows:
s421, a high-dimensional index tree-type data structure is established, and data of all surface nodes of the local structure are stored in the tree as three-dimensional point clouds;
s422, as shown in FIG. 5, for any triangular mesh M on the surface of the cavity, three vertexes A, B and C of the triangular mesh are read, three product surface nodes closest to the vertexes are sequentially found by utilizing a tree search nearest point algorithm, and the node corresponding to the point A is A 1 ，A 2 And A 3 The node corresponding to the point B is B 1 ，B 2 And B 3 The node corresponding to the point C is C 1 ，C 2 And C 3 ；
S423, calculating pressure values of three vertexes A, B and C, taking the point A as a starting point to A 1 ，A 2 And A 3 The triangle is formed to be perpendicular to obtain a foot A', and a triangle surface set S is calculated in sequence A’A1A2 ，S A’A1A3 ，S A’A2A3 ，S A1A2A3 The pressure value at point a is:
wherein P is A1 、P A2 、P A3 The pressure value calculation method of the fixed points B and C is the same as that of the fixed point A;
s424, calculating a pressure value on a triangular surface M, wherein the pressure value on the triangular surface M is the average value of the pressure values of three vertexes A, B and C, and the direction of the pressure is perpendicular to the triangular surface M outwards.
S425, sequentially performing the steps S422-S424 on all triangular grid units on the surface of the local structure, and thus, the automatic loading of the surface load of the local structure can be realized.
As shown in fig. 6, the present invention provides an automatic creation system of an analysis model of a local structure of an injection mold, comprising:
the node information deriving module is used for simplifying the injection mold CAD model, generating a simplified injection mold CAD model, carrying out global structural analysis on the simplified injection mold CAD model to obtain a stress strain result, and deriving node information of all nodes of the model;
the automatic cutting module is used for extracting main deformation nodes according to node information of all nodes of the model, endowing attribute labels to adjacent nodes around the main deformation nodes, clustering coordinate information of the nodes endowed with the attribute labels to generate smooth cutting surfaces, automatically cutting the global model to obtain a local structure, and finely dividing grids of the local structure;
the boundary surface node constraint module is used for placing the local structure subjected to grid division in a global structure analysis model, and completing automatic addition of boundary displacement constraint of the local structure by matching displacement vectors with the boundary surface nodes;
and the local structure automatic updating module is used for adding other constraints and loads on the local structure through a classified adding processing mode and automatically updating other preset constraints and loads on the local structure. It will be understood that modifications and variations will be apparent to those skilled in the art from the foregoing description, and it is intended that all such modifications and variations be included within the scope of the following claims.
Claims (8)
1. An automatic creation method of an analysis model of a local structure of an injection mold is characterized by comprising the following steps:
s1, simplifying an injection mold CAD model, generating a simplified injection mold CAD model, performing global structural analysis on the simplified injection mold CAD model to obtain a stress strain result, and deriving node information of all nodes of the model;
s2, extracting main deformation nodes according to node information of all nodes of the model, endowing attribute labels to adjacent nodes around the main deformation nodes, clustering coordinate information of the nodes endowed with the attribute labels to generate smooth cutting surfaces, automatically cutting the global model to obtain a local structure, and finely dividing grids of the local structure;
s3, placing the local structure subjected to grid division in a global structure analysis model, and completing automatic addition of boundary displacement constraint of the local structure by matching displacement vectors with boundary surface nodes;
s4, adding other constraints and loads on the local structure in a classified adding processing mode, and automatically updating other preset constraints and loads on the local structure;
in step S4, the adding of other constraints and loads on the local structure through the processing manner of classification adding is specifically:
s41, constraint and load applied to the geometric body surface are directly added by traversing the CAD model to find the pairing surface of the geometric body;
s42, adding the constraint and the load applied to the grid cell surface to realize the constraint and the load addition of the local structure model by utilizing interpolation calculation after the local structure grid is repartitioned;
in step S42, the constraint and load addition to the local structure model are implemented by interpolation calculation as follows:
s421, a high-dimensional index tree-type data structure is established, and data of all surface nodes of the local structure are stored in the tree as three-dimensional point clouds;
s422, reading three vertexes A, B and C of any triangular grid M on the surface of the cavity, and sequentially finding three product surface nodes closest to the vertexes by utilizing a tree search nearest point algorithm, wherein the node corresponding to the point A is A 1 ，A 2 And A 3 The node corresponding to the point B is B 1 ，B 2 And B 3 The node corresponding to the point C is C 1 ，C 2 And C 3 ；
S423, calculating pressure values of three vertexes A, B and C, taking the point A as a starting point to A 1 ，A 2 And A 3 The triangle is formed to be perpendicular to obtain a foot A', and a triangle surface set S is calculated in sequence A’A1A2 ，S A’A1A3 ，S A’A2A3 ，S A1A2A3 The pressure value at point a is:
wherein P is A1 、P A2 、P k3 The pressure value calculation method of the fixed points B and C is the same as that of the fixed point A;
s424, calculating a pressure value on a triangular surface M, wherein the pressure value on the triangular surface M is an average value of pressure values of three vertexes A, B and C, and the direction of the pressure is perpendicular to the triangular surface M outwards;
s425, sequentially performing the steps S422-S424 on all triangular grid units on the surface of the local structure, and thus, the automatic loading of the surface load of the local structure can be realized.
2. The method of claim 1, wherein the node information includes a node global number, the node global number being a cell ID of the mold structure analysis, node coordinate information being x, y, z coordinate values of the node, and node strain amplitude being a vector sum of strain values in x, y, z coordinate directions of the node.
3. The method according to claim 2, wherein the extraction method of the main deformed node is: traversing the derived node information, wherein the node with the node strain amplitude larger than the strain threshold is the main deformation node.
4. The method according to claim 1, wherein the process of assigning attribute labels to neighboring nodes around the main deformed node in step S2 is: firstly, adding a selected attribute to the derived node information, setting a default value to be 0, traversing the derived node information, setting the selected attribute value to be 1 for non-primary deformed nodes within a finite element mesh size from the primary deformed node, and marking the selected attribute value as boundary surface nodes.
5. The method according to claim 1, wherein the clustering of the coordinate information of the nodes to which the attribute tags are assigned in step S2 to generate a smooth cut surface means: and generating a curved surface by using the coordinate information of the nodes and adopting B spline fitting.
6. The method of claim 4, wherein matching the displacement vectors to the boundary surface nodes in step S3 comprises the steps of:
s31, storing the boundary surface nodes into a plurality of objects, and setting a distance threshold radius;
s32, sequentially reading nodes in one array Object, reading non-main deformed nodes with selected attribute values of 0, calculating node distances, and giving the node displacement vector to the nodes in the read array Object when the node distances are smaller than a distance threshold radius;
s33, repeating S32 until nodes in the array Object are traversed.
7. The method of claim 1, wherein the other constraints and loads refer to the other constraints including a fixed constraint, a contact constraint, and a distal constraint, and the other loads include a cavity pressure, a mold clamping force, and a bolt pre-tightening force.
8. An automatic creation system of an injection mold local structure analysis model based on the automatic creation method of an injection mold local structure analysis model according to claim 1, characterized by comprising:
the node information deriving module is used for simplifying the injection mold CAD model, generating a simplified injection mold CAD model, carrying out global structural analysis on the simplified injection mold CAD model to obtain a stress strain result, and deriving node information of all nodes of the model;
the automatic cutting module is used for extracting main deformation nodes according to node information of all nodes of the model, endowing attribute labels to adjacent nodes around the main deformation nodes, clustering coordinate information of the nodes endowed with the attribute labels to generate smooth cutting surfaces, automatically cutting the global model to obtain a local structure, and finely dividing grids of the local structure;
the boundary surface node constraint module is used for placing the local structure subjected to grid division in a global structure analysis model, and completing automatic addition of boundary displacement constraint of the local structure by matching displacement vectors with the boundary surface nodes;
and the local structure automatic updating module is used for adding other constraints and loads on the local structure through a classified adding processing mode and automatically updating other preset constraints and loads on the local structure.
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