CN111027248A - Automatic creation method and system for injection mold local structure analysis model - Google Patents
Automatic creation method and system for injection mold local structure analysis model Download PDFInfo
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Abstract
The invention discloses a method and a system for automatically creating an injection mould local structure analysis model, which are characterized in that an injection mould CAD model is simplified, and global structure analysis is carried out to obtain node information of all nodes of the model; further extracting main deformation nodes and endowing adjacent nodes around the main deformation nodes with attribute labels to generate a smooth cutting surface, so that automatic cutting of the global model is realized, a local structure is obtained, and meshes are finely divided; the method comprises the steps of placing a local structure in a global structure analysis model, and realizing automatic addition of boundary displacement constraint of the local structure by matching displacement vectors to boundary surface nodes; and automatically updating other constraints and loads on the local structure by a processing mode of classified addition. The method realizes the cutting of local structures, the addition of boundary displacement and the automatic calculation of other constraints and loads, 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 has a complex structure, and a large number of grid cells need to be divided when the injection mold is subjected to structural analysis. Too many meshes put tremendous strain on the computation, and the number of meshes is usually reduced by simplifying the model and partitioning the model into sparse meshes. However, for some regions with large stress strain, the sparse grid may not meet the precision requirement. For the cavity region with high precision requirement, the product quality defect can be caused by slight error. Therefore, when the mold structure is analyzed, a more accurate analysis result must be obtained in the area with larger local deformation so as to meet the actual production and processing requirements. And the local structure analysis technology is adopted to only analyze the local part, so that the operation cost is saved and the operation precision is improved.
Most of the existing methods are to extract parts independently and analyze stress and constraint states of the parts so as to perform structural analysis of a local model, the stress conditions of the parts are different in different molds, and the stress states and the constraint states of the parts 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 cavity and the like, and other parts except the areas still adopt sparse grids, so that automatic addition is realized for load constraint of the local structure, and both accuracy and timeliness are considered.
Disclosure of Invention
The invention aims to solve the technical problem that a large number of grid units need to be divided in the prior art, and the addition cannot be automatically identified in the structural analysis of the stress state and the constraint state of the grid units, and provides a method and a system for automatically creating an injection mold local structural analysis model.
The technical scheme adopted by the invention 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 the injection mould CAD model to generate a simplified injection mould CAD model, carrying out global structure analysis on the simplified injection mould 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, giving attribute labels to adjacent nodes around the main deformation nodes, clustering coordinate information of the nodes given the attribute labels to generate a smooth cutting surface, automatically cutting the global model to obtain a local structure, and finely dividing meshes for the local structure;
s3, placing the local structure subjected to grid division into a global structure analysis model, and matching displacement vectors with the nodes of the boundary surface to finish the automatic addition of boundary displacement constraint of the local structure;
and S4, adding other constraints and loads on the local structure through a classified adding processing mode, and automatically updating the preset other 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 value, 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 value is a vector sum of strain values in x, y and z coordinate directions of the node.
According to the technical scheme, the extraction method of the main deformation nodes comprises the following steps: and traversing the derived node information, wherein the node with the node strain amplitude larger than the strain threshold is a main deformation node.
In step S2, the process of assigning attribute labels to neighboring nodes around the main deformed node is as follows: 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 a non-main deformation node within a finite element grid size away from the main deformation node, and marking as a boundary surface node.
In connection with the above technical solution, the clustering the coordinate information of the node given the attribute label in step S2 to generate a smooth cut surface means: and generating a curved surface by adopting B spline fitting by utilizing the coordinate information of the nodes.
In connection with the above technical solution, the step of matching the displacement vector to the boundary surface node in step S3 includes the following steps:
s31, storing the boundary surface nodes into an array Object, and setting a distance threshold radius;
s32, sequentially reading nodes in an array Object, reading non-main deformed nodes with a selected attribute value of 0, calculating a node distance, and endowing the node displacement vector to the read nodes in the array Object when the node distance is smaller than a distance threshold radius;
s33, repeating S32 until the nodes in the array Object are traversed.
According to the technical scheme, the other constraints and loads include fixed constraints, contact constraints and far-end constraints, and the other loads include cavity pressure, clamping force and bolt pretightening force.
In step S4, adding other constraints and loads on the local structure by the classification and addition processing method specifically includes:
s41, applying constraints and loads on the surface of the geometric body, and finding a matching surface of the geometric body by traversing the CAD model to directly add the constraints and the loads;
and S42, applying constraints and loads on the grid unit surface, and after the partial structure grid is divided again, using interpolation calculation to realize the constraints and load addition of the partial structure model.
In step S42, the constraint and load addition of the local structure model is realized by interpolation as follows:
s421, establishing a high-dimensional index tree type data structure, and storing the data of all surface nodes of the local structure in the tree as three-dimensional point cloud;
s422, any one of the surfaces of the cavityReading three vertexes A, B and C of the triangular mesh, sequentially finding three product surface nodes closest to the vertexes by using a tree search closest point algorithm, wherein the node corresponding to the point A is A1，A2And A3The node corresponding to the point B is B1，B2And B3The node corresponding to the point C is C1，C2And C3；
S423, calculating pressure values of the three vertexes A, B and C, and taking the point A as a starting point to the point A1，A2And A3The composed triangle is used as a vertical line to obtain a foot A', and a triangle surface set S is sequentially calculatedA’A1A2，SA’A1A3，SA’A2A3，SA1A2A3Then, the pressure value at point a is:
wherein, PA1、PA2、PA3Respectively, the calculation method of the pressure values of the fixed points B and C is the same as that of the fixed point A;
and S424, calculating the pressure value on the triangular surface M, wherein the magnitude of the pressure value on the triangular surface M is the average value of the pressure values of the three vertexes A, B and C, and the direction of the pressure is perpendicular to the triangular surface M and faces outwards.
And S425, sequentially carrying out the operations of the steps S422 to S424 on all the triangular mesh units on the surface of the local structure, and thus realizing the automatic loading of the surface load of the local structure.
There is provided an injection mold local structural analysis model automatic creation system including:
the node information derivation module is used for simplifying the injection mould CAD model, generating a simplified injection mould CAD model, carrying out global structure analysis on the simplified injection mould CAD model, obtaining 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 adjacent nodes around the main deformation nodes with attribute labels, clustering coordinate information of the nodes endowed with the attribute labels, generating a smooth cutting surface, automatically cutting the global model to obtain a local structure, and finely dividing meshes for the local structure;
the boundary surface node constraint module is used for placing the local structure subjected to grid division into a global structure analysis model and matching displacement vectors with the boundary surface nodes to finish the automatic addition of boundary displacement constraint of the local structure;
and the local structure automatic updating module is used for adding other constraints and loads on the local structure in a classified adding processing mode and automatically updating the preset other constraints and loads on the local structure.
The invention has the following beneficial effects: according to the invention, through cutting of a local structure, addition of boundary displacement and automatic calculation of other constraints and loads, the accuracy and timeliness of structural analysis are improved, and the method is well applied to 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 implementation 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 graph of tags assigned to selected attributes for nodes implemented by the method of the present invention;
FIG. 4 is a schematic diagram of the positions of boundary surface nodes and non-principal deformation nodes implemented by 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 architecture in which the method of the present invention is implemented.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, the present invention provides an automatic creation method of an injection mold local structure analysis model, comprising the following steps:
s1, simplifying the injection mould CAD model to generate a simplified injection mould CAD model, carrying out global structure analysis on the simplified injection mould 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, giving attribute labels to adjacent nodes around the main deformation nodes, clustering coordinate information of the nodes given the attribute labels to generate a smooth cutting surface, automatically cutting the global model to obtain a local structure, and finely dividing meshes for the local structure;
s3, placing the local structure subjected to grid division into a global structure analysis model, and matching displacement vectors with the nodes of the boundary surface to finish the automatic addition of boundary displacement constraint of the local structure;
and S4, adding other constraints and loads on the local structure through a classified adding processing mode, and automatically updating the preset other constraints and loads on the local structure.
A schematic diagram of an injection mold embodying the method of the present invention is shown in fig. 2. Simplifying a CAD (computer-aided design) model of the injection mold by a conventional method, carrying out global structure analysis, obtaining a stress-strain analysis result through finite element calculation, and deriving node information; local structures for accurate analysis are separately extracted from the global model. Automatically adding boundary displacement constraint of a local structure; and automatically updating other constraints and loads on the local structure by a processing mode of classified addition. Therefore, automatic creation of the injection mold local structure analysis model is realized.
Further, as shown in fig. 3, the node information includes a node global number, node coordinate information, and a node strain amplitude, where 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: and traversing the derived node information, wherein the node with the node strain amplitude larger than the strain threshold is a 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: 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 a non-main deformation node within a finite element grid size away from the main deformation node, and marking as a boundary surface node.
Further, the clustering processing of the coordinate information of the node to which the attribute tag is given in step S2 to generate a smooth cut surface means: and generating a curved surface by adopting B spline fitting by utilizing the coordinate information of the nodes.
Further, the matching of the displacement vector to the boundary surface node in step S3 includes the following steps:
s31, storing the boundary surface nodes into an array Object, and setting a distance threshold radius;
s32, sequentially reading nodes in an array Object, reading non-main deformed nodes with a selected attribute value of 0, calculating a node distance, and endowing the node displacement vector to the read nodes in the array Object when the node distance is smaller than a distance threshold radius;
s33, repeating S32 until the nodes in the array Object are traversed.
As shown in fig. 4, the black nodes are the main deformed nodes, the nodes on the boundary are the boundary surface nodes with the attribute selected value of 1, and the white nodes outside the boundary are the non-main deformed nodes.
Further, other constraints and loads include fixed constraints, contact constraints and far-end constraints, and the other loads include cavity pressure, clamping force and bolt pre-tightening force.
Further, the step S4 of adding other constraints and loads on the local structure by the processing manner of adding by classification specifically includes:
s41, applying constraints and loads on the surface of the geometric body, and finding a matching surface of the geometric body by traversing the CAD model to directly add the constraints and the loads;
and S42, applying constraints and loads on the grid unit surface, and after the partial structure grid is divided again, using interpolation calculation to realize the constraints and load addition of the partial structure model.
Further, the constraint and load addition to the local structure model in step S42 by using interpolation is specifically as follows:
s421, establishing a high-dimensional index tree type data structure, and storing the data of all surface nodes of the local structure in the tree as three-dimensional point cloud;
s422, as shown in figure 5, for any triangular mesh M on the surface of the cavity, reading three vertexes A, B and C of the triangular mesh, and sequentially finding three product surface nodes closest to the vertexes by using a tree search closest point algorithm, wherein a node corresponding to the point A is A1，A2And A3The node corresponding to the point B is B1，B2And B3The node corresponding to the point C is C1，C2And C3；
S423, calculating pressure values of the three vertexes A, B and C, and taking the point A as a starting point to the point A1，A2And A3The composed triangle is used as a vertical line to obtain a foot A', and a triangle surface set S is sequentially calculatedA’A1A2，SA’A1A3，SA’A2A3，SA1A2A3Then, the pressure value at point a is:
wherein, PA1、PA2、PA3Respectively, the calculation method of the pressure values of the fixed points B and C is the same as that of the fixed point A;
and S424, calculating the pressure value on the triangular surface M, wherein the magnitude of the pressure value on the triangular surface M is the average value of the pressure values of the three vertexes A, B and C, and the direction of the pressure is perpendicular to the triangular surface M and faces outwards.
And S425, sequentially carrying out the operations of the steps S422 to S424 on all the triangular mesh units on the surface of the local structure, and thus realizing the automatic loading of the surface load of the local structure.
As shown in fig. 6, the present invention provides an automatic creation system of an injection mold local structural analysis model, comprising:
the node information derivation module is used for simplifying the injection mould CAD model, generating a simplified injection mould CAD model, carrying out global structure analysis on the simplified injection mould CAD model, obtaining 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 adjacent nodes around the main deformation nodes with attribute labels, clustering coordinate information of the nodes endowed with the attribute labels, generating a smooth cutting surface, automatically cutting the global model to obtain a local structure, and finely dividing meshes for the local structure;
the boundary surface node constraint module is used for placing the local structure subjected to grid division into a global structure analysis model and matching displacement vectors with the boundary surface nodes to finish the automatic addition of boundary displacement constraint of the local structure;
and the local structure automatic updating module is used for adding other constraints and loads on the local structure in a classified adding processing mode and automatically updating the preset other constraints and loads on the local structure. It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (10)
1. An automatic creation method of an injection mold local structure analysis model is characterized by comprising the following steps:
s1, simplifying the injection mould CAD model to generate a simplified injection mould CAD model, carrying out global structure analysis on the simplified injection mould 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, giving attribute labels to adjacent nodes around the main deformation nodes, clustering coordinate information of the nodes given the attribute labels to generate a smooth cutting surface, automatically cutting the global model to obtain a local structure, and finely dividing meshes for the local structure;
s3, placing the local structure subjected to grid division into a global structure analysis model, and matching displacement vectors with the nodes of the boundary surface to finish the automatic addition of boundary displacement constraint of the local structure;
and S4, adding other constraints and loads on the local structure through a classified adding processing mode, and automatically updating the preset other constraints and loads on the local structure.
2. The method according to claim 1, wherein 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 an x, y and z coordinate value of the node, and the node strain amplitude is a vector sum of strain values in the x, y and z coordinate directions of the node.
3. The method according to claim 2, wherein the extraction method of the main deformed node is as follows: and traversing the derived node information, wherein the node with the node strain amplitude larger than the strain threshold is a main deformation node.
4. The method according to claim 1, wherein the process of assigning attribute labels to the neighboring nodes around the main deformed node in step S2 is: 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 a non-main deformation node within a finite element grid size away from the main deformation node, and marking as a boundary surface node.
5. The method according to claim 1, wherein the clustering processing of the coordinate information of the node given the attribute label in step S2 to generate the smooth cut surface is: and generating a curved surface by adopting B spline fitting by utilizing the coordinate information of the nodes.
6. The method of claim 4, wherein the step of matching the displacement vector to the boundary surface node in the step S3 comprises the steps of:
s31, storing the boundary surface nodes into an array Object, and setting a distance threshold radius;
s32, sequentially reading nodes in an array Object, reading non-main deformed nodes with a selected attribute value of 0, calculating a node distance, and endowing the node displacement vector to the read nodes in the array Object when the node distance is smaller than a distance threshold radius;
s33, repeating S32 until the nodes in the array Object are traversed.
7. The method of claim 1, wherein the other constraints and loads are selected from the group consisting of fixed constraints, contact constraints, and remote constraints, and wherein the other loads include cavity pressure, clamping forces, and bolt pretension.
8. The method according to claim 1, wherein the step S4 of adding other constraints and loads on the local structure by the classification adding processing method specifically includes:
s41, applying constraints and loads on the surface of the geometric body, and finding a matching surface of the geometric body by traversing the CAD model to directly add the constraints and the loads;
and S42, applying constraints and loads on the grid unit surface, and after the partial structure grid is divided again, using interpolation calculation to realize the constraints and load addition of the partial structure model.
9. The method according to claim 8, wherein the constraint and load addition to the local structure model in step S42 is implemented by using interpolation calculation as follows:
s421, establishing a high-dimensional index tree type data structure, and storing the data of all surface nodes of the local structure in the tree as three-dimensional point cloud;
s422, reading three vertexes A, B and C of the triangular mesh for any triangular mesh M on the surface of the cavity, sequentially finding three product surface nodes closest to the vertexes by utilizing a tree search closest point algorithm, wherein the node corresponding to the point A is A1，A2And A3The node corresponding to the point B is B1，B2And B3The node corresponding to the point C is C1，C2And C3；
S423, calculating pressure values of the three vertexes A, B and C, and taking the point A as a starting point to the point A1，A2And A3The composed triangle is used as a vertical line to obtain a foot A', and a triangle surface set S is sequentially calculatedA’A1A2，SA’A1A3，SA’A2A3，SA1A2A3Then, the pressure value at point a is:
wherein, PA1、PA2、PA3Respectively, the calculation method of the pressure values of the fixed points B and C is the same as that of the fixed point A;
and S424, calculating the pressure value on the triangular surface M, wherein the magnitude of the pressure value on the triangular surface M is the average value of the pressure values of the three vertexes A, B and C, and the direction of the pressure is perpendicular to the triangular surface M and faces outwards.
And S425, sequentially carrying out the operations of the steps S422 to S424 on all the triangular mesh units on the surface of the local structure, and thus realizing the automatic loading of the surface load of the local structure.
10. An automatic creation system of an injection mold local structural analysis model, comprising:
the node information derivation module is used for simplifying the injection mould CAD model, generating a simplified injection mould CAD model, carrying out global structure analysis on the simplified injection mould CAD model, obtaining 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 adjacent nodes around the main deformation nodes with attribute labels, clustering coordinate information of the nodes endowed with the attribute labels, generating a smooth cutting surface, automatically cutting the global model to obtain a local structure, and finely dividing meshes for the local structure;
the boundary surface node constraint module is used for placing the local structure subjected to grid division into a global structure analysis model and matching displacement vectors with the boundary surface nodes to finish the automatic addition of boundary displacement constraint of the local structure;
and the local structure automatic updating module is used for adding other constraints and loads on the local structure in a classified adding processing mode and automatically updating the preset other constraints and loads on the local structure.
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