Motion mechanism tolerance simulation analysis method

Abstract

The application relates to the technical field of motion mechanism design, and discloses a motion mechanism tolerance simulation analysis method, which comprises the following steps: establishing a tolerance simulation motion mechanism in tolerance analysis software; driving the tolerance simulation motion mechanism in the tolerance analysis software, judging whether the established tolerance simulation motion mechanism meets design requirements according to a motion form, correcting the simulation motion mechanism when the design requirements are not met, and continuing until the design requirements are met; defining the tolerance of the tolerance simulation motion mechanism that meets the design requirements in the tolerance analysis software; defining analyzed and examined elements in the tolerance simulation motion mechanism in the tolerance analysis software; driving the tolerance simulation motion mechanism again to move the analyzed and examined elements of the tolerance simulation motion mechanism to a position to be analyzed; and performing tolerance simulation analysis on the tolerance simulation motion mechanism in the position to be analyzed by the tolerance analysis software to obtain tolerance simulation analysis results, so that the design is optimized.

Description

Technical Field

[0001] This invention relates to the field of motion mechanism design technology, and in particular to a method for simulation analysis of motion mechanism tolerances. Background Technology

[0002] Mechanical products have a wide variety of motion mechanisms, and these mechanisms work together with the structure to achieve specific functions.

[0003] Currently, most moving parts of mechanical products are CNC machined, and tooling is used for positioning during assembly. Standard parts are used for fitment between structures and mechanisms, as well as between mechanisms themselves. Mechanisms also employ various design features such as threads and long elliptical curves for compensation, with adjustments made on-site. However, due to the large number of mechanisms and their interdependent functions, inconsistent adjustment ranges lead to production instability and difficulties in interchangeability. Summary of the Invention

[0004] To address at least some of the problems existing in the prior art, the present invention provides a motion mechanism tolerance simulation analysis method. This motion mechanism tolerance simulation analysis method combines motion simulation with tolerance analysis simulation. With the help of motion simulation, the analyzed and assessed mechanism is moved to any required analysis position. With the help of tolerance analysis simulation, tolerance simulation analysis is performed on the analyzed and assessed mechanism at the analysis position to obtain tolerance simulation analysis results, thereby optimizing the design.

[0005] To achieve the above objectives, this invention provides a method for tolerance simulation analysis of motion mechanisms. This method includes: Step 1: Establishing a tolerance simulation motion mechanism in the tolerance analysis software; Step 2: Driving the tolerance simulation motion mechanism in the tolerance analysis software, determining whether the established tolerance simulation motion mechanism meets design requirements based on the motion form, and correcting the simulation motion mechanism until the design requirements are met; Step 3: Defining tolerances for the tolerance simulation motion mechanism that meets the design requirements in the tolerance analysis software; defining the analyzed assessment elements in the tolerance simulation motion mechanism in the tolerance analysis software; Step 4: Driving the tolerance simulation motion mechanism again to move the analyzed assessment mechanism to the position to be analyzed; Step 5: Performing tolerance simulation analysis on the tolerance simulation motion mechanism at the position to be analyzed in the tolerance analysis software to obtain the tolerance simulation analysis results.

[0006] In this technical solution, a tolerance simulation motion mechanism can be established within the tolerance analysis software, and the software can drive this mechanism. Furthermore, tolerances and analyzed assessment elements can be defined within the tolerance analysis software. Therefore, after the tolerance simulation motion mechanism meets design requirements and the tolerances and analyzed assessment elements are defined, it can be driven again to move the analyzed assessment mechanism to the position to be analyzed. The tolerance analysis software then performs tolerance simulation analysis on the mechanism at the analyzed position to obtain the results. To analyze other positions of the analyzed assessment mechanism, it can be moved to those positions. Similarly, to analyze other analyzed assessment mechanisms, they can be moved to their corresponding analyzed positions for tolerance simulation analysis. Therefore, this motion mechanism tolerance simulation analysis method combines motion simulation with tolerance analysis simulation. With the help of motion simulation, the analyzed and assessed mechanism is moved to any required analysis position. With the help of tolerance analysis simulation, tolerance simulation analysis is performed on the analyzed and assessed mechanism at the analysis position to obtain tolerance simulation analysis results, thereby optimizing the design of the motion mechanism, improving the stability of the generated mechanism, and enabling interchangeability of the same type of parts.

[0007] Furthermore, the motion mechanism tolerance simulation analysis method includes a data conversion and import step prior to step one. The data conversion and import step includes converting the motion mechanism model drawn by the drawing software into a data format that can be recognized by the tolerance analysis software, and importing the data format into the tolerance analysis software. In step one, the tolerance analysis software establishes the tolerance simulation motion mechanism based on the imported data format.

[0008] Furthermore, the motion mechanism tolerance simulation analysis method includes a simplification step prior to the data conversion and import step, wherein the simplification step simplifies the motion mechanism model to obtain a simplified motion mechanism model; in the data conversion and import step, the simplified motion mechanism model is converted into the data format.

[0009] Furthermore, the simplification step includes performing Boolean fusion on parts in the motion mechanism model that do not participate in the analysis and calculation of the assessed elements.

[0010] Furthermore, the simplification step includes Boolean fusion of mechanisms that are relatively stationary during the overall motion of the motion mechanism model.

[0011] Furthermore, the motion mechanism tolerance simulation analysis method includes establishing a simplified model motion mechanism in a drafting software using the simplified model of the motion mechanism, wherein measurement factors are established for the simplified model motion mechanism and driving parameters are input to perform motion simulation.

[0012] Furthermore, in step two, the same measurement factors are established for the tolerance simulation motion mechanism and the simplified model motion mechanism, and the same driving parameters are input to perform simulation motion. Under the same driving parameters and the same measurement factors, the measurement results of the tolerance analysis software and the drawing software are compared. When the measurement results of the two are consistent, it is determined that the tolerance simulation motion mechanism meets the design requirements.

[0013] Furthermore, the motion mechanism tolerance simulation analysis method includes outputting the relationship between motion extremes that can be displayed throughout the entire simulation motion process during the simulation motion of the simplified model motion mechanism.

[0014] Furthermore, in step four, the location to be analyzed includes the location of the motion extremum.

[0015] In addition, defining tolerances includes defining part tolerances, defining assembly tolerances, and converting adjustment amounts into identification tolerances that can be recognized by the tolerance analysis software.

[0016] It is obvious that the elements or features described in the above individual embodiments can be used alone or in combination in other embodiments. Attached Figure Description

[0017] The dimensions and scales in the accompanying drawings do not represent the actual dimensions and scales of the product. The drawings are for illustrative purposes only, and some non-essential elements or features have been omitted for clarity.

[0018] Figure 1 This is an exemplary flowchart illustrating a motion mechanism tolerance simulation analysis method according to an embodiment of the present invention;

[0019] Figure 2 This is an exemplary schematic diagram illustrating simplified steps;

[0020] Figure 3 This is an exemplary schematic diagram illustrating step two;

[0021] Figure 4 This is an exemplary schematic diagram showing the relationship of a motion extremum that can display the entire simulated motion process. Detailed Implementation

[0022] The present invention will now be described in detail with reference to the accompanying drawings. The embodiments described herein are merely preferred embodiments of the invention; those skilled in the art can conceive of other ways to implement the invention based on these preferred embodiments, and such other ways also fall within the scope of the invention.

[0023] refer to Figure 1 The motion mechanism tolerance simulation analysis method provided by this invention includes: Step 1: Establishing a tolerance simulation motion mechanism in tolerance analysis software, for example... Figure 1 The process involves five steps: 1) Importing a simplified model and establishing a motion mechanism; 2) Verifying the motion mechanism by driving the tolerance simulation motion mechanism in the tolerance analysis software, judging whether the established tolerance simulation motion mechanism meets the design requirements based on the motion form, and correcting the simulation motion mechanism until the design requirements are met; 3) Defining tolerances for the tolerance simulation motion mechanism that meets the design requirements in the tolerance analysis software; defining the analyzed assessment elements in the tolerance simulation motion mechanism in the tolerance analysis software; 4) Driving the tolerance simulation motion mechanism again to move the analyzed assessment elements of the tolerance simulation motion mechanism to the position to be analyzed; 5) The tolerance analysis software performs tolerance simulation analysis on the tolerance simulation motion mechanism at the position to be analyzed (e.g., performing Monte Carlo calculations or iterative calculations of other data) to obtain the tolerance simulation analysis results.

[0024] In this method for tolerance simulation analysis of motion mechanisms, a tolerance simulation motion mechanism can be established within the tolerance analysis software, which can then drive this mechanism. Furthermore, tolerances and analyzed assessment elements can be defined within the tolerance analysis software. After the tolerance simulation motion mechanism meets design requirements and the tolerances and analyzed assessment elements are defined, it can be driven again to move the analyzed assessment mechanism to the position to be analyzed. The tolerance analysis software then performs tolerance simulation analysis on the mechanism at the analyzed position to obtain the results. To analyze other positions of the analyzed assessment mechanism, it can be moved to those positions. Similarly, to analyze other analyzed assessment mechanisms, they can be moved to their corresponding analyzed positions for tolerance simulation analysis. Therefore, this motion mechanism tolerance simulation analysis method combines motion simulation with tolerance analysis simulation. With the help of motion simulation, the analyzed mechanism is moved to any position required for analysis. With the help of tolerance analysis simulation, tolerance simulation analysis is performed on the analyzed mechanism at the position to obtain the tolerance simulation analysis results, thereby optimizing the design of the motion mechanism.

[0025] Establishing a tolerance simulation motion mechanism in tolerance analysis software can include adding corresponding kinematic pairs, such as revolute pairs and sliding pairs, between mechanisms or between mechanisms and structures.

[0026] In this motion mechanism tolerance simulation analysis method, the motion mechanism can be drawn in the tolerance analysis software. That is, the tolerance analysis software is configured to have graphic drawing capabilities. In this way, graphics can be drawn directly in the tolerance analysis software according to the design requirements, so that the tolerance simulation motion mechanism can be established directly in the tolerance analysis software.

[0027] In other embodiments, the kinematic mechanism model drawn using external drafting software can be imported into the tolerance analysis software, for example, referring to... Figure 1 The motion mechanism tolerance simulation analysis method includes a data conversion and import step prior to step one. This step involves converting the motion mechanism model drawn using drafting software into a data format recognizable by the tolerance analysis software, and then importing this data format into the tolerance analysis software. In step one, the tolerance analysis software establishes a tolerance simulation motion mechanism based on the imported data format. This allows the tolerance analysis software to drive the established tolerance simulation motion mechanism.

[0028] In some implementations, the original kinematic mechanism model drawn by the drafting software can be converted into a data format and imported into tolerance analysis software. Alternatively, in other implementations, refer to... Figure 1 The motion mechanism tolerance simulation analysis method includes a simplification step before the data conversion and import step. This simplification step simplifies the motion mechanism model to obtain a simplified model. In the data conversion and import step, the simplified model is converted into a data format. This allows for the simplification of parts of the motion mechanism model that are not involved in the analysis and evaluation; for example, these parts can be integrally formed with the moving components, thereby reducing the amount of data and the workload of data conversion, and improving the accuracy and efficiency of the simulation analysis.

[0029] Of course, in this motion mechanism tolerance simulation analysis method, the simplification steps can include a variety of simplification types. For example, in one simplification type, the simplification steps include Boolean fusion of parts in the motion mechanism model that do not participate in the analysis and calculation of the elements being analyzed and assessed. For example, these parts can be fused into a single component.

[0030] In another simplified type, reference Figure 2 The simplification steps include Boolean fusion of relatively stationary mechanisms during the overall motion of the motion mechanism model. This allows multiple relatively stationary mechanisms throughout the motion to be treated as a single mechanism. For example, in... Figure 2In the entire motion of the linkage mechanism, mechanism A and mechanism B, and mechanism B and mechanism C are relatively stationary with no rotational or translational relationship. Therefore, mechanism A, B and C can be regarded as a single mechanism, and the movement of the entire mechanism is participated in by the hole at the left end of mechanism A and the hole at the right end of mechanism C.

[0031] Furthermore, in this motion mechanism tolerance simulation analysis method, the method includes establishing a simplified model motion mechanism in drafting software using a simplified motion mechanism model. This involves establishing measurement factors for the simplified model motion mechanism and inputting driving parameters to simulate motion. Thus, the reference... Figure 3 It can determine whether the simulated motion of the simplified model motion mechanism is consistent with the simulated motion of the original motion mechanism in the drawing software, thereby improving the accuracy of the tolerance simulation motion mechanism established in the tolerance analysis software.

[0032] Additionally, refer to Figure 3 In step two, the same measurement factors are established for both the tolerance simulation motion mechanism and the simplified model motion mechanism, and the same driving parameters are input for simulation motion. The measurement results from the tolerance analysis software and the plotting software are compared under the same driving parameters and measurement factors. When the measurement results of both are consistent, the tolerance simulation motion mechanism is considered to meet the design requirements. Thus, if... Figure 3 As shown, when the measurement results of the two are consistent, it can be determined that the tolerance simulation motion mechanism and the original motion mechanism have the same simulated motion.

[0033] Furthermore, in this motion mechanism tolerance simulation analysis method, the method includes establishing a simplified motion mechanism using a simplified model of the motion mechanism in drafting software. This involves establishing measurement factors for the simplified model's motion mechanism and inputting driving parameters for simulation. During the simulation of the simplified model's motion mechanism, the method outputs the relationships between motion extrema throughout the entire simulation process. This allows determination of which motion parameters achieve their corresponding motion extrema, thereby optimizing the design. For example, the simulation motion in CAD can output the relationships between gaps, steps, angles, etc., between mechanisms or between mechanisms and structures when motion extrema occur, providing a reference. Figure 4 For example, when a mechanism rotates 30 degrees, a maximum gap of 2mm will be generated between the mechanism and the structure. Therefore, the mechanism needs to be monitored at the 30° rotation position.

[0034] In addition, in step four, the location to be analyzed includes the location of the extreme value of motion, or any other location that needs to be analyzed and assessed.

[0035] Furthermore, defining tolerances includes defining part tolerances, such as the shape tolerances of parts involved in movement or parts involved in dimensional chain transmission, the size and position tolerances of holes, the size and position tolerances of shafts, etc.; additionally, positioning tolerances include defining assembly tolerances, such as the position tolerances of relevant intersection points after assembly of structures connected to the mechanism, the fastener tolerances of connecting holes and shafts, etc.; furthermore, positioning tolerances include converting adjustment amounts into identification tolerances that can be recognized by tolerance analysis software, for example, converting mechanism adjustment amounts into dimensional tolerances, form tolerances, and position tolerances that can be recognized by tolerance analysis software, such as the length of an adjusting rod, etc. For example, refer to... Figure 2 In the original mechanisms A, B, and C, mechanism A and mechanism B are connected by a thread, and mechanism A can extend or retract by 5mm along its axis. Similarly, mechanism C and mechanism B are connected by a thread, and mechanism C can extend or retract by 5mm along its axis. After Boolean simplification of mechanisms A, B, and C, the adjustment amounts of the original mechanisms A and C are converted into a distance tolerance of ±10mm between the two holes in a certain direction in the new mechanism. For example, in a shaft connector cylinder, a horizontal mounting plate extends from the outer surface of the shaft connector cylinder. A strip-shaped hole can be formed on the horizontal mounting plate to adjust the installation angle of the shaft connector cylinder. Therefore, the strip-shaped hole can be converted into tolerances along the radial and arc directions.

[0036] In addition, the elements (measurement factors) to be analyzed and assessed in the tolerance simulation motion mechanism defined in the tolerance analysis software can include gaps, step differences, angles, etc. between mechanisms and between mechanisms and structures.

[0037] In addition, the drafting software can be CAD software or other 3D software such as Solidworks software, ProE software, etc.

[0038] In addition, in the tolerance simulation analysis method of this motion mechanism, based on the tolerance simulation analysis results, it is possible to determine whether the contribution and sensitivity of each factor, such as adjustment amount, hole-shaft fit, and assembly, are in line with expectations. Then, based on a series of factors such as manufacturing capability, the established analysis model can be optimized, such as optimizing the benchmark, optimizing the assembly sequence, and optimizing the tolerance. Based on the optimization of the established analysis model, the optimization results can be verified and compared with the data before optimization.

[0039] The scope of protection of this invention is defined only by the claims. Thanks to the teachings of this invention, those skilled in the art will readily recognize that alternative structures to the structures disclosed herein can be used as feasible alternative implementations, and that the implementations disclosed herein can be combined to produce new implementations, which also fall within the scope of the appended claims.

Claims

1. A method for simulation analysis of tolerances in a motion mechanism, characterized in that, include: The simplification steps include simplifying the motion mechanism model drawn by the drawing software to obtain a simplified motion mechanism model. In the drawing software, the simplified motion mechanism model is used to establish a simplified model motion mechanism, measurement factors are established for the simplified model motion mechanism, and driving parameters are input to perform simplified model simulation motion, so that the simplified model simulation motion is consistent with the original model simulation motion. The data conversion and import step includes converting the simplified model of the motion mechanism into a data format that can be recognized by the tolerance analysis software, and importing the data format into the tolerance analysis software. In the tolerance analysis software, a tolerance simulation motion mechanism is established based on the imported data format; The tolerance simulation motion mechanism is driven in the tolerance analysis software. The establishment of the tolerance simulation motion mechanism is judged according to the motion form to determine whether it meets the design requirements. If it does not meet the design requirements, the simulation motion mechanism is corrected until the design requirements are met. In the tolerance analysis software, at least the tolerance related to any required analysis position is defined for the tolerance simulation motion mechanism that meets the design requirements, and at least the analyzed assessment element related to the analysis position is defined in the tolerance simulation motion mechanism. The tolerance simulation motion mechanism is driven again to move the analyzed and tested mechanism to the position to be analyzed; The tolerance analysis software is used to perform tolerance simulation analysis on the tolerance simulation motion mechanism at the position to be analyzed, so as to obtain the tolerance simulation analysis results. The same measurement factors are established for the tolerance simulation motion mechanism and the simplified model motion mechanism, and the same driving parameters are input for simulation motion. The measurement results of the tolerance analysis software and the plotting software are compared under the same driving parameters and measurement factors. When the measurement results of the two are consistent, the tolerance simulation motion mechanism is deemed to meet the design requirements.

2. The motion mechanism tolerance simulation analysis method according to claim 1, characterized in that, The simplification step includes performing Boolean fusion on parts in the motion mechanism model that are not involved in the analysis and calculation of the factors being analyzed and assessed.

3. The motion mechanism tolerance simulation analysis method according to claim 1, characterized in that, The simplification steps include Boolean fusion of mechanisms that are relatively stationary during the overall motion of the motion mechanism model.

4. The motion mechanism tolerance simulation analysis method according to claim 1, characterized in that, The motion mechanism tolerance simulation analysis method includes outputting the relationship between motion extremes throughout the entire simulation motion process in the simulation motion of the simplified model motion mechanism.

5. The motion mechanism tolerance simulation analysis method according to claim 4, characterized in that, The location to be analyzed includes the location of the motion extremum.

6. The motion mechanism tolerance simulation analysis method according to any one of claims 1-5, characterized in that, The defined tolerances include defining part tolerances, defining assembly tolerances, and converting adjustment amounts into identification tolerances that can be recognized by the tolerance analysis software.

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