Gantry machining center stand column design method and stand column structure

Abstract

The invention relates to the technical field of machining, and discloses a gantry machining center stand column design method and a stand column structure.The design method comprises the steps that a finite element analysis model is established; analyzing the key working condition through a finite element analysis model and extracting a result; topological optimization is carried out according to the extracted result, and a topological optimization result is obtained; and carrying out structural design and result verification on the stand column according to an optimization result. By establishing the finite element analysis model, analyzing the key working condition and extracting the result, the influence of various working condition loads on the stand column can be considered when the stand column of the gantry machining center is designed, and the situation that the working condition with large deformation covers the working condition with small deformation due to the fact that the loads of the various working conditions are directly superposed for analysis is prevented. According to the method, topological optimization is carried out according to the extracted analysis results of the various working condition loads, topological optimization results are obtained, structural design of the stand column is carried out on the basis, the results are verified, and good control over the structural rigidity of the stand column is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical processing, and in particular to a column design method and a column structure of a gantry processing center. Background Art

[0002] When designing the column of a gantry machining center, it is necessary to consider the deformation of the column caused by the gravity of the part above the column, as well as the deformation of the column caused by the cutting force. If these two working conditions are directly superimposed and analyzed, the working condition with significantly large deformation will cover up the working condition with small deformation. As a result, the working condition with small column deformation is easily ignored, and the structural stiffness of the column cannot be well controlled. Summary of the invention

[0003] In view of this, the present invention provides a gantry machining center column design method to solve the problem that when two working conditions loads are directly superimposed on the gantry machining center column, the working condition with significantly large deformation will cover up the working condition with small deformation, resulting in that the working condition with smaller deformation of the column is easily ignored, and the structural stiffness of the column cannot be well controlled.

[0004] In a first aspect, the present invention provides a method for designing a column of a gantry machining center, comprising the following steps:

[0005] Step 1: Establish finite element analysis model;

[0006] Step 2: Analyze the key working conditions and extract the results through the finite element analysis model;

[0007] Step 3: Perform topology optimization based on the extracted results and obtain the topology optimization results;

[0008] Step 4: Design the structure of the column according to the optimization results;

[0009] Step 5: Verify the results.

[0010] This gantry machining center column design method, during the design process, by establishing a finite element analysis model, and through the finite element analysis model to analyze and extract the results of key working conditions, can achieve the design of the gantry machining center column to consider the impact of various working conditions on the column, to prevent the direct superposition of multiple working conditions loads for analysis, resulting in the significant deformation of the large deformation of the working conditions will cover the small deformation of the working conditions. According to the analysis results of the extracted multiple working conditions loads, the topology optimization is carried out, and the topology optimization results are obtained. On this basis, the column structure design is carried out, and the results are verified to achieve better control of the column structure stiffness.

[0011] In an optional embodiment, the step 1 includes the following sub-steps:

[0012] Determine the model components: The model includes columns, beams, saddles, rams, spindles, guide rails, sliders, lead screw nuts and lead screws;

[0013] Determine boundary conditions: Apply fixed constraints to the bottom mounting surface of the column;

[0014] Determine the connection between components: set fixed constraints on the bottom mounting surface of the column, the column and the crossbeam are bound together, the crossbeam and the guide rail are bound together, the ram and the guide rail and the spindle are bound together, the saddle and the slider are bound together, the saddle and the lead screw nut are bound together, the lead screw nut and the saddle are connected through a lead screw, and the guide rail and the slider are bound together.

[0015] In an optional implementation, the critical operating conditions in step 2 include critical operating condition 1 and then critical operating condition 2;

[0016] The key working condition 1 is the deformation and load of the column when the gravity of the components above the column acts on the column;

[0017] The key working condition 2 is the deformation and stress condition of the column when the cutting force acts on the column.

[0018] In an optional implementation, the step 2 includes analyzing the key working condition 1 through a finite element analysis model and extracting results, including the following sub-steps:

[0019] Set the load for critical condition 1: Apply the standard earth gravity vertically downward to the column. In critical condition 1, the column's own gravity is not considered, and the material density of the column is set to 0;

[0020] Extraction of key working condition 1 results: Extract the load and maximum deformation on the upper surface of the column, including the X-axis, Y-axis and Z-axis components. The extracted force load is F1 and the moment is M1.

[0021] In an optional implementation, the step 2 further includes analyzing the key working condition 2 through a finite element analysis model and extracting results, including the following sub-steps:

[0022] Set the load for critical working condition 2: the saddle is located in the middle of the beam, the ram is located at the bottom of the Z axis, and the maximum torque is used to calculate the X-axis, Y-axis, and Z-axis components of the cutting force, and apply the cutting force to the spindle end face;

[0023] Extraction of key working condition 2 results: Extract the load and maximum deformation on the upper surface of the column, including the X-axis, Y-axis and Z-axis components. The extracted force load is F2 and the moment is M2.

[0024] In an optional implementation, the load on the upper surface of the column is the bending moment and force on the upper surface of the column.

[0025] In an optional implementation, the step three includes the following sub-steps:

[0026] Topology optimization method: Use the topology optimization method with target mass minimization to remove materials on non-force transmission paths and retain materials on force transmission paths;

[0027] Topology optimization analysis model: In order to analyze the reasonable layout of the column material when the saddle is at different positions on the Y axis, the models of key working conditions 1 and 2 are simplified, and only the column is retained. The loads of other components on the column are replaced by the extracted force load F1, moment M1 and force load F2, moment M2;

[0028] Topology optimization key condition 1: Load the force load F1 and moment M1 extracted from key condition 1 onto the upper surface of the column;

[0029] Topology optimization key condition 2: Load the force load F2 and moment M2 extracted from key condition 2 onto the upper surface of the column;

[0030] Optimized area: Fill the interior of the column with a solid, and the resulting solid structure is used as the optimized area;

[0031] Optimization goal: Minimize the mass of the optimized area, and the retained material mass fraction is equal to the mass of the optimized column / the mass of the solid column.

[0032] In an optional implementation, the step five includes the following sub-steps:

[0033] Key working condition 1 verification: Using the structure designed in step 4, calculate the X-direction deformation and Z-direction deformation of the column according to the key working condition 1 method described in step 2, and verify;

[0034] Critical working condition 2 verification: Using the structure designed in step 4, calculate the X-direction deformation and Z-direction deformation of the column according to the critical working condition 2 method described in step 2, and verify.

[0035] In an optional implementation, the step five includes the following sub-steps:

[0036] The result meets the requirements and outputs the final result, or

[0037] Repeat step 2 or step 1 until the result meets the requirements and output the final result.

[0038] In a second aspect, the present invention further provides a column structure, which is designed by the above-mentioned column design method of the gantry machining center, and includes a column body, wherein a cavity is provided inside the column body, and bolt holes communicating with the cavity are provided at both upper and lower ends of the column body;

[0039] Among them, a number of reinforcing ribs are provided on the inner side of the cavity and around the bolt hole, and the reinforcing ribs include an annular reinforcing rib arranged at the center of the cavity and fixed to the side wall of the cavity, vertical ribs arranged in the vertical direction and fixed to the side wall of the cavity and the annular reinforcing ribs, horizontal concave ribs arranged in the horizontal direction and fixed to the side wall of the cavity and the annular reinforcing ribs, and two diagonal ribs connected to the diagonals of the cavity and fixed to the annular reinforcing ribs.

[0040] The column design method and column structure of a gantry machining center provided by the present invention have the following advantages:

[0041] 1. The present invention provides a method for designing a column of a gantry machining center, the method comprising the following steps:

[0042] Step 1: Establish finite element analysis model;

[0043] Step 2: Analyze the key working conditions and extract the results through the finite element analysis model;

[0044] Step 3: Perform topology optimization based on the extracted results and obtain the topology optimization results;

[0045] Step 4: Design the structure of the column according to the optimization results;

[0046] Step 5: Verify the results.

[0047] This gantry machining center column design method, during the design process, by establishing a finite element analysis model, and through the finite element analysis model to analyze and extract the results of key working conditions, can achieve the design of the gantry machining center column to consider the impact of various working conditions on the column, to prevent the direct superposition of multiple working conditions loads for analysis, resulting in the significant deformation of the large deformation of the working conditions will cover the small deformation of the working conditions. According to the analysis results of the extracted multiple working conditions loads, the topology optimization is carried out, and the topology optimization results are obtained. On this basis, the column structure design is carried out, and the results are verified to achieve better control of the column structure stiffness.

[0048] 2. The present invention provides a design method for a gantry machining center column, which can provide a detailed reference for the design, effectively control the accuracy and rigidity of the column, and improve the utilization rate of materials. The rigidity of the column is large, which can improve the machining accuracy of the machine tool and also improve the dynamic performance of the machine tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0050] Figure 1 A schematic flow chart of a method for designing a column of a gantry machining center provided in an embodiment of the present invention;

[0051] Figure 2 It is a finite element analysis model in the column design method of the gantry machining center provided in the embodiment of the present invention;

[0052] Figure 3 It is a force diagram of key working condition 1 in the column design method of the gantry machining center provided in an embodiment of the present invention;

[0053] Figure 4 It is a stress diagram of key working condition 2 in the column design method of the gantry machining center provided in an embodiment of the present invention;

[0054] Figure 5 A schematic diagram of topological optimization force in a column design method for a gantry machining center provided in an embodiment of the present invention;

[0055] Figure 6 A topological density cloud map in the column design method for a gantry machining center provided in an embodiment of the present invention;

[0056] Figure 7 It is a schematic structural diagram of a column provided in an embodiment of the present invention;

[0057] Figure 8 It is a schematic diagram of the internal structure of a column provided in an embodiment of the present invention.

[0058] Description of reference numerals:

[0059] 1- Pillar;

[0060] 2- beam;

[0061] 3- Sliding saddle;

[0062] 4-Sliding ram;

[0063] 5- Main axis;

[0064] 6-Guide rail;

[0065] 7- Annular reinforcement;

[0066] 8-vertical ribs;

[0067] 9- horizontal concave ribs;

[0068] 10- oblique tension ribs;

[0069] 11-End reinforcement ribs. DETAILED DESCRIPTION

[0070] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0071] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0072] Example 1

[0073] At present, when designing the column of the gantry machining center, it is necessary to consider the deformation of the column caused by the gravity of the part above the column, and the deformation of the column caused by the cutting force. If these two working conditions are directly superimposed and analyzed, the working condition with significantly large deformation will cover up the working condition with small deformation. As a result, the working condition with small column deformation is easily ignored, and the structural stiffness of the column cannot be well controlled.

[0074] To this end, this embodiment provides a gantry machining center column design method to solve the above problems. Figure 1 The process diagram shown in FIG. 1 comprises the following steps:

[0075] Step 1: Establish finite element analysis model;

[0076] Step 2: Analyze the key working conditions and extract the results through the finite element analysis model;

[0077] Step 3: Perform topology optimization based on the extracted results and obtain the topology optimization results;

[0078] Step 4: Design the structure of the column according to the optimization results;

[0079] Step 5: Verify the results.

[0080] In the design process, by establishing a finite element analysis model, and analyzing and extracting the results of key working conditions through the finite element analysis model, it is possible to consider the effects of various working condition loads on column 1 when designing the gantry machining center column 1, and prevent the working condition with significant deformation from covering the working condition with small deformation due to the direct superposition of multiple working condition loads. Topology optimization is performed based on the analysis results of the extracted multiple working condition loads, and the topology optimization results are obtained. On this basis, the structure of column 1 is designed, and the results are verified to achieve better control of the structural stiffness of column 1.

[0081] Figure 2 It is the finite element analysis model in the design method of the gantry machining center column 1 provided in the embodiment. In this embodiment, step 1 includes the following sub-steps:

[0082] Determine the model components: The model includes a column 1, a crossbeam 2, a saddle 3, a ram 4, a spindle 5, a guide rail 6, a slider, a screw nut and a screw;

[0083] Determine the boundary conditions: apply fixed constraints to the bottom mounting surface of column 1;

[0084] Determine the connection between the components: set a fixed constraint on the bottom mounting surface of the column 1, the column 1 and the crossbeam 2 are bound together, the crossbeam 2 and the guide rail 6 are bound together, the ram 4 and the guide rail 6 and the spindle 5 are bound together, the saddle 3 and the slider are bound together, the saddle 3 and the lead screw nut are bound together, the lead screw nut and the saddle 3 are connected by a lead screw, and the guide rail 6 and the slider are bound together. Among them, the slider, lead screw nut and lead screw are all set Figure 2 Inside the middle saddle 3, since it is necessary to analyze the force on the column 1 in the design method of the gantry machining center provided in this embodiment, the column 1 is regarded as a whole for the upper structure of the column 1, and the connection relationship and position of the upper structure of the column 1 are not repeated. In this embodiment, the force acting on the column 1 as a whole will be analyzed.

[0085] In this embodiment, the key working conditions in step 2 include key working condition 1 and then key working condition 2. Specifically, key working condition 1 is the deformation and load of column 1 when the gravity of components above column 1 acts on column 1; key working condition 2 is the deformation and force of column 1 when cutting force acts on column 1.

[0086] Specifically, Figure 3 This is a force diagram of a key working condition 1 in the design method of a gantry machining center column 1 provided in this embodiment. Above point A in the figure are the components above the column 1 in this embodiment.

[0087] In this embodiment, step 2 includes analyzing the key working condition 1 through a finite element analysis model and extracting results, including the following sub-steps:

[0088] Set the load for critical working condition 1: Apply the standard earth gravity vertically downward to column 1. In critical working condition 1, the gravity of column 1 itself is not considered, and the material density of column 1 is set to 0.

[0089] Extraction of key working condition 1 results: Extract the load and maximum deformation on the upper surface of column 1, including the X-axis, Y-axis and Z-axis components. The extracted force load is F1 and the moment is M1.

[0090] Figure 4 This is a force diagram of the key working condition 2 in the design method of the gantry machining center column 1 provided in this embodiment. Above B in the figure are the parts above the column 1 in this embodiment.

[0091] In this embodiment, step 2 also includes analyzing the key working condition 2 and extracting the results through a finite element analysis model, including the following sub-steps:

[0092] Set the load of key working condition 2: the saddle 3 is located in the middle of the beam 2, the ram 4 is located at the bottom of the Z axis, and the maximum torque is used to calculate the X-axis, Y-axis, and Z-axis components of the cutting force, and apply the cutting force to the end face of the spindle 5;

[0093] Extraction of key working condition 2 results: Extract the load and maximum deformation on the upper surface of column 1, including the X-axis, Y-axis and Z-axis components. The extracted force load is F2 and the moment is M2.

[0094] The load on the upper surface of the column 1 is the bending moment and force on the upper surface of the column 1 .

[0095] In this embodiment, step 3 includes the following sub-steps:

[0096] Topology optimization method: Use the topology optimization method with target mass minimization to remove materials on non-force transmission paths and retain materials on force transmission paths;

[0097] Topology optimization analysis model: In order to analyze the reasonable layout of the column 1 material when the saddle 3 is at different positions on the Y axis, the models of key working conditions 1 and 2 are simplified, and only column 1 is retained. The loads of other components on column 1 are replaced by the extracted force load F1, moment M1 and force load F2, moment M2;

[0098] Topology optimization key condition 1: Load the force load F1 and moment M1 extracted from key condition 1 onto the upper surface of column 1;

[0099] Topology optimization key condition 2: Load the force load F2 and moment M2 extracted from key condition 2 onto the upper surface of column 1;

[0100] Optimized area: Fill the interior of column 1 with a solid, and the resulting solid structure is used as the optimized area;

[0101] Optimization goal: Minimize the mass of the optimized area, and the retained material mass fraction is equal to the mass of the optimized column 1 / the mass of the solid column 1.

[0102] Specific as Figure 5 As shown, Figure 5 It is a schematic diagram of the force of topological optimization in the design method of the gantry machining center column 1 provided in the embodiment; in the figure, point a is a fixed constraint set at the bottom of the column 1, F is the force load F1 extracted from the key working condition 1 or the force load F2 extracted from the key working condition 2, and M is the moment M1 extracted from the key working condition 1 or the moment M2 extracted from the key working condition 2.

[0103] Figure 6 It is a topological density cloud map in the design method of the gantry machining center column 1 provided in this embodiment; in step 4, according to Figure 6 The topological density cloud map shown is used for the structural design of column 1.

[0104] Specifically, in step 4, the structural design method of the column 1 is as follows:

[0105] 4.1: According to the topological density cloud map, plan the location of the main weight reduction window on column 1. The location of the weight reduction window is as follows: Figure 7 and Figure 8 As shown;

[0106] According to the above topological density cloud map, the reinforcement ribs are planned, such as Figure 7 and Figure 8 As shown, the vertical rib 8 is located in the middle of the column 1, with a vertical direction, playing a supporting role. The vertical rib 8 crosses the annular reinforcement rib 7 to better improve the rigidity of the column 1; the diagonal rib 10 crosses the annular reinforcement rib 7 to play the main role in bending and torsion resistance; the horizontal concave rib 9 crosses the annular reinforcement rib 7 and is in a zigzag shape, which can improve the torsional rigidity of the column 1; the end reinforcement rib 11 is used to increase the rigidity near the joint surface installation; the diagonal rib 10, the vertical rib 8, and the horizontal concave rib 9 all cross the annular reinforcement rib 7 to well improve the overall rigidity of the column 1 and a better force transmission path.

[0107] In this embodiment, step five includes the following sub-steps:

[0108] Key working condition 1 verification: Using the structure designed in step 4, calculate the X-direction deformation and Z-direction deformation of column 1 according to the key working condition 1 method in step 2, and verify;

[0109] Critical working condition 2 verification: Using the structure designed in step 4, calculate the X-direction deformation and Z-direction deformation of column 1 according to the critical working condition 2 method in step 2, and verify.

[0110] After the above key condition 1 check and key condition 2 check, if the result meets the requirements, the final result is output. If the result does not meet the requirements, the cause is analyzed to see if it is caused by the optimization settings in step 2. If so, repeat step 2 and reset the parameters in step 2 until the result meets the requirements. If it is not caused by the optimization settings in step 2, repeat step 1 to modify the model components, boundary conditions, and connections between components.

[0111] The column design method for a gantry machining center provided in this embodiment analyzes key working conditions 1 and key working conditions 2 through a finite element analysis model and extracts results, then performs topology optimization based on the extracted results, obtains topology optimization results, and performs structural design of the column based on the optimization results. This can avoid the deformation of the column caused by the gravity of the part above the column and the deformation of the column caused by the cutting force. When the two working condition loads are directly superimposed for analysis, the working condition with significantly large deformation will mask the working condition with small deformation, thereby causing the working condition with small column deformation to be easily ignored, and the structural stiffness of the column cannot be well controlled.

[0112] Example 2

[0113] This embodiment provides a column 1 structure, which is designed using the gantry machining center column 1 design method in Embodiment 1.

[0114] like Figure 7 and Figure 8 As shown, the column 1 structure includes a column 1 body, a cavity is provided inside the column 1 body, and bolt holes communicating with the cavity are provided at both the upper and lower ends of the column 1 body;

[0115] Among them, a number of reinforcing ribs are provided on the inner side of the cavity and around the bolt hole, and the reinforcing ribs include an annular reinforcing rib 7 arranged at the center of the cavity and fixed to the side wall of the cavity, a vertical rib 8 arranged in the vertical direction and fixed to the side wall of the cavity and the annular reinforcing rib 7, a horizontal concave rib 9 arranged in the horizontal direction and fixed to the side wall of the cavity and the annular reinforcing rib 7, and two inclined ribs 10 connected to the diagonals of the cavity and fixed to the annular reinforcing rib 7.

[0116] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A method for designing a column of a gantry machining center, characterized in that: The steps include: Step 1: Establish finite element analysis model; Step 2: Analyze the key working conditions and extract the results through the finite element analysis model; Step 3: Perform topology optimization based on the extracted results and obtain the topology optimization results; Step 4: Design the structure of the column according to the optimization results; Step 5: Verify the results.

2. The method for designing a column of a gantry machining center according to claim 1, characterized in that: The step 1 includes the following sub-steps: Determine the model components: the model includes a column (1), a crossbeam (2), a saddle (3), a ram (4), a spindle (5), a guide rail (6), a slider, a screw nut, and a screw; Determine the boundary conditions: apply a fixed constraint to the bottom mounting surface of the column (1); Determine the connection between the components: set a fixed constraint on the bottom mounting surface of the column (1); the column (1) and the crossbeam (2) are bound together; the crossbeam (2) and the guide rail (6) are bound together; the ram (4) and the guide rail (6) and the spindle (5) are bound together; the saddle (3) and the slider are bound together; the saddle (3) and the lead screw nut are bound together; the lead screw nut and the saddle (3) are connected via a lead screw; and the guide rail (6) and the slider are bound together.

3. The method for designing a column of a gantry machining center according to claim 2, characterized in that: The key operating conditions in step 2 include key operating condition 1 and key operating condition 2; The key working condition 1 is the deformation and load of the column (1) when the gravity of the components above the column (1) acts on the column (1); The key working condition 2 is the deformation and stress condition of the column (1) when the cutting force acts on the column (1).

4. The method for designing a column of a gantry machining center according to claim 3, characterized in that: The step 2 includes analyzing the key working condition 1 and extracting the results through a finite element analysis model, including the following sub-steps: Set the load for critical working condition 1: apply the standard earth gravity vertically downward to the column (1). In critical working condition 1, the gravity of the column (1) itself is not considered, and the material density of the column (1) is set to 0; Extraction of results for key working condition 1: Extract the load and maximum deformation on the upper surface of the column (1), including the X-axis, Y-axis and Z-axis components. The extracted force load is F1 and the moment is M1.

5. The method for designing a column of a gantry machining center according to claim 4, characterized in that: The step 2 also includes analyzing the key working condition 2 and extracting the results through the finite element analysis model, including the following sub-steps: Set the load of key working condition 2: the saddle (3) is located in the middle of the beam (2), the ram (4) is located at the lowest position of the Z axis, and the maximum torque is used to calculate the X-axis, Y-axis and Z-axis components of the cutting force, and apply the cutting force to the end face of the spindle (5); Extraction of results for key working condition 2: Extract the load and maximum deformation on the upper surface of the column (1), including the X-axis, Y-axis and Z-axis components. The extracted force load is F2 and the moment is M2.

6. The method for designing a column of a gantry machining center according to claim 4 or 5, characterized in that: The load on the upper surface of the column (1) is the bending moment and force on the upper surface of the column (1).

7. The method for designing a column of a gantry machining center according to claim 1, characterized in that: The following sub-steps are described in step 3: Topology optimization method: Use the topology optimization method with target mass minimization to remove materials on non-force transmission paths and retain materials on force transmission paths; Topology optimization analysis model: In order to analyze the reasonable layout of the column (1) material when the saddle (3) is at different positions on the Y axis, the models of key working conditions 1 and key working conditions 2 are simplified, and only the column (1) is retained. The loads of other components on the column (1) are replaced by the extracted force load F1, moment M1 and force load F2, moment M2; Topology optimization key working condition 1: The force load F1 and moment M1 extracted from key working condition 1 are loaded onto the upper surface of the column (1); Topology optimization key working condition 2: Load the force load F2 and moment M2 extracted from key working condition 2 onto the upper surface of the column (1); Optimized area: Fill the interior of the column (1) with a solid, and the resulting solid structure is used as the optimized area; Optimization goal: Minimize the mass of the optimized area, and the retained material mass fraction is equal to the mass of the optimized column (1) / the mass of the solid column (1).

8. The method for designing a column of a gantry machining center according to claim 5, characterized in that: The step five includes the following sub-steps: Key working condition 1 verification: using the structure designed in step 4, calculate the X-direction deformation and Z-direction deformation of the column (1) according to the key working condition 1 method described in step 2, and verify; Key working condition 2 verification: Using the structure designed in step 4, calculate the X-direction deformation and Z-direction deformation of the column (1) according to the key working condition 2 method described in step 2, and verify.

9. The method for designing a column of a gantry machining center according to claim 1, characterized in that: The step five includes the following sub-steps: The result meets the requirements and outputs the final result, or Repeat step 2 or step 1 until the result meets the requirements and output the final result.

10. A column structure, designed by using the design method of a gantry machining center column (1) according to any one of claims 1 to 9, characterized in that: It comprises a column (1) body, a cavity is provided inside the column (1) body, and bolt holes communicating with the cavity are provided at both upper and lower ends of the column (1) body; A plurality of reinforcing ribs are provided on the inner side of the cavity and around the bolt hole, and the reinforcing ribs include an annular reinforcing rib (7) provided at the center of the cavity and fixed to the cavity side wall, a vertical rib (8) provided in the vertical direction and fixed to the cavity side wall and the annular reinforcing rib (7), a horizontal concave rib (9) provided in the horizontal direction and fixed to the cavity side wall and the annular reinforcing rib (7), and two inclined ribs (10) connected to the diagonal sides of the cavity and fixed to the annular reinforcing rib (7).

Images