Standard processing technology generation method based on manufacturing resource capability center constraint

Abstract

The invention provides a manufacturing resource capability center constraint-based standard processing technology generation method, which comprises the steps of S1, constructing an enterprise manufacturing resource capability center; S2, transmitting information of a manufacturing resource material layer to a manufacturing resource function layer, and transmitting information of the manufacturing resource function layer to the capability center, obtaining size, precision capability, shape capability, position and direction capability data of the capability center; s3, constructing a standard processing technology library; s4, establishing a processing technology automatic decision flow; s5, mapping the manufacturing feature recognition information and the numerical control machining process, and finally obtaining the machining process of the part. The machining process method suitable for enterprises can be generated according to the manufacturing resource characteristics of the enterprises, and the manufacturing experience accumulation of programmers is inherited by introducing a standard machining process library; repeated work of a green hand is avoided, manual programming errors and loopholes are reduced, the accuracy of numerical control machining and the consistency of machining parameters are ensured, and the product value is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of numerical control machining processes, and in particular to a method for generating a standard machining process based on the constraints of a manufacturing resource capability center. Background Art

[0002] For CNC machining companies, the issue they care about most is how to use their manufacturing resources to produce high-quality product parts without significantly increasing costs, so as to meet customers' high-quality requirements.

[0003] The current situation is that the manufacturing resources owned by small and medium-sized CNC machining companies are not systematized. Before CNC machining, companies need to perform CNC programming based on the requirements of the received orders. Since CNC programming is affected by factors such as machine tools, cutting tools, fixtures, and processes, the programming model based on CAM software has high requirements for CNC programmers. Small and medium-sized CNC machining companies lack high-level programmers and the programming quality is low. Since separate programming is required each time, it takes a long time, the order price is low, and the cost remains high, and the product market competitiveness is insufficient.

[0004] Therefore, it is necessary to conduct research and development on the current situation and study a method for generating standard machining processes based on the constraints of manufacturing resource capability centers. Summary of the Invention

[0005] (1) Technical problems solved

[0006] In response to the shortcomings of the existing technology, the present invention provides a standard processing technology generation method based on the constraints of the manufacturing resource capability center, which solves the technical problems of low quality, long time, high cost and insufficient product market competitiveness of enterprise CNC machining programming.

[0007] (2) Technical solution

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions: a method for generating a standard processing technology based on the constraints of a manufacturing resource capability center, comprising the following steps:

[0009] S1: Build an enterprise manufacturing resource capability center, which includes the manufacturing resource material layer, the manufacturing resource function layer, and the capability center layer;

[0010] S2: Transfer the information of the manufacturing resource material layer to the manufacturing resource function layer, and transfer the information of the manufacturing resource function layer to the capability center to obtain the size and accuracy capability, shape capability, position and direction capability data of the capability center;

[0011] S3: Build a standard processing technology library; according to the type of manufacturing features, establish a general table and a processing technology feature table of the standard processing technology library. The processing technology feature table is associated with the sub-feature table of each processing feature. Then, according to the different processing accuracy levels in the sub-feature table, the sub-feature accuracy level table of the database is created. Under the sub-feature accuracy, the processing procedures and each processing step are associated;

[0012] S4: Establish an automatic decision-making process for processing technology; the decision-making process includes:

[0013] 1) Analyze the manufacturing feature information of the model, obtain the geometric information attributes of the manufacturing features, and map them with the standard processing technology;

[0014] 2) Selection of standard processing technology: Analyze the acquired manufacturing feature information, obtain the normal vector of each manufacturing feature and compare it with the processing normal vector to determine the processing method;

[0015] 3) Processing sequence of manufacturing features: The determination of the processing sequence follows the CNC processing principles: "roughing first, then finishing", "surface first, then hole", "interior first, then exterior", and "process concentration";

[0016] 4) Decision-making on the process steps of the processing technology: determine the most optimized processing technology based on the obtained manufacturing feature information;

[0017] S5: Map the manufacturing feature identification information to the CNC machining process to obtain the machining process for the part. Preferably, the manufacturing resource material layer in S1 includes stored material data for tools, machine tools, and fixtures; the manufacturing resource function layer includes information acquisition from the manufacturing resource function layer; and the capability center layer describes the tool function information, machine tool function information, and fixture function information in the manufacturing resource function layer.

[0018] Preferably: in S2, the steps of information transmission between the manufacturing resource function layer and the capability center layer are as follows: Step 1: According to the actual factory production needs, obtain the information in the manufacturing resource function layer and configure the capability center; Step 2: According to the processing task requirements, determine whether the capability center meets the requirements. If it does not meet the requirements, reconfigure the capability center; Step 3: Call the capability center that meets the processing task requirements.

[0019] Preferably: in S2, the steps of information transmission between the manufacturing resource function layer and the capability center layer are as follows: Step 1: According to the actual factory production needs, obtain the information in the manufacturing resource function layer and configure the capability center; Step 2: According to the processing task requirements, determine whether the capability center meets the requirements. If it does not meet the requirements, reconfigure the capability center; Step 3: Call the capability center that meets the processing task requirements.

[0020] The technical solution of the present invention has the following beneficial effects: the present invention can generate a processing method suitable for the enterprise according to the characteristics of the enterprise's manufacturing resources. By introducing a standard processing technology library, the accumulated manufacturing experience of programmers can be passed on, avoiding novices from doing repetitive work, reducing human programming errors and loopholes, and making the enterprise's manufacturing resource allocation more reasonable. Through automatic programming of CNC machine tools, production management can be optimized, production cycle can be shortened, large-scale production can be achieved, the accuracy of CNC processing and the consistency of processing parameters can be ensured, and product value can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Manufacturing Resource Capability Center Framework;

[0022] Figure 2 Flowchart of information transmission between material level and function level;

[0023] Figure 3 Flowchart of information transmission between functional level and capability center level;

[0024] Figure 4 Schematic diagram of the structure of the standard processing technology library;

[0025] Figure 5 Automatic decision-making framework for machining processes;

[0026] Figure 6 Schematic diagram of the mapping between manufacturing feature recognition information and CNC machining process. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0028] like Figure 1-6 As shown, the present invention provides a method for generating a standard processing technology based on the constraints of the manufacturing resource capability center, including the following steps:

[0029] S1: Build an enterprise manufacturing resource capability center:

[0030] like Figure 1 As shown: In the present invention patent, enterprise manufacturing resources include machine tool manufacturing resources, tool manufacturing resources, and fixture manufacturing resources;

[0031] The manufacturing resource capability center includes the manufacturing resource material layer, the manufacturing resource function layer, and the capability center layer; the manufacturing resource material layer includes the stored material data of cutting tools, machine tools, and fixtures; the material data includes tool type, tool parameters, machine tool type, machine tool worktable size, fixture size, cutting capability parameters recommended by tool manufacturers, machine tool accuracy, fixture accuracy, etc.

[0032] The manufacturing resource function layer includes information acquisition from the manufacturing resource function layer, which can be divided into two cases. The first is basic information directly obtained from the manufacturing resource material layer. The second is the need to process parameter information based on the acquired information. For example, the cutting linear velocity Vc and feed rate per tooth Fz provided by the tool manufacturer need to be calculated using the speed formula and feed rate formula to calculate the spindle speed and feed rate. The tool function information library and the machine tool function information library divide the information into: identification parameters, structural parameters, capability parameters, and process parameters. The fixture function information library is divided into: identification parameters, structural parameters, and capability parameters.

[0033] Capability center layer: In the manufacturing resource function layer, the description of tool function information, machine tool function information, and fixture function information is combined into a resource capability center based on the actual production needs of the manufacturing enterprise. Each capability center will have different processing capabilities based on different tool information, fixture information, and machine tool information.

[0034] The capability center layer is divided into three types of capabilities, namely size and precision capability, shape capability, and position and orientation capability; shape capability is mainly formed by the combination of machine tool function information and tool function, position and orientation capability is jointly affected by machine tool function information and fixture function information, and size and precision capability is jointly determined by the functional information of machine tools, fixtures, and tools.

[0035] S2: Transfer the information of the manufacturing resource material layer to the manufacturing resource function layer, and transfer the information of the manufacturing resource function layer to the capability center to obtain the size and accuracy capability, shape capability, position and direction capability data of the capability center.

[0036] like Figure 2 As shown: The information transmission relationship between the manufacturing resource material layer and the manufacturing resource function layer: the manufacturing resource material layer is established based on the basic data provided by the manufacturer. The manufacturing resource material layer includes three basic data information databases, namely the tool basic material information database, the machine tool basic material information database, and the fixture basic material information database; the corresponding manufacturing resource function layer also has three functional information databases, namely the tool function information database, the machine tool function information database, and the fixture function information database.

[0037] The steps for information transmission between the manufacturing resource material layer and the manufacturing resource function layer are as follows:

[0038] Step 1: Obtain information on the manufacturing resource function layer from the manufacturing resource material layer;

[0039] Step 2: Determine whether the acquired manufacturing resource material layer information is manufacturing resource function layer information;

[0040] Step 3: Determine whether the manufacturing resource function layer information obtained in the second step requires information processing;

[0041] Step 4: After processing the manufacturing resource material information that needs to be processed, merge it with the information that does not need to be processed to generate manufacturing resource function layer information.

[0042] like Figure 3 As shown in the figure: The information transmission relationship between the manufacturing resource function layer and the capability center layer: The capability center layer is composed of the tool function information library, machine tool function information library, and fixture function information library in the manufacturing resource function layer; the information transmission steps between the manufacturing resource function layer and the capability center layer are as follows:

[0043] Step 1: Based on the actual factory production needs, obtain information from the manufacturing resource function layer and configure the capability center;

[0044] Step 2: According to the processing task requirements, determine whether the capability center meets the requirements. If not, reconfigure the capability center;

[0045] Step 3: Call the capability center that meets the requirements of the processing task.

[0046] S3: Build a standard processing technology library.

[0047] like Figure 4 As shown in the figure: To build a standard processing technology library, you first need to establish a general table and a processing technology feature table of the standard processing technology library according to the type of manufacturing feature. Then, associated with the processing technology feature table is a sub-feature table for each processing feature. Then, based on the different processing accuracy levels in the sub-feature table, the database sub-feature accuracy level table is created. Associated with the sub-feature accuracy are the processing procedures and each processing step.

[0048] S4: Establishing an automatic decision-making process for processing technology:

[0049] like Figure 5-6 As shown in the figure: The decision of processing technology is the key link in realizing the generation of manufacturing feature tool paths. The processing technology decision is made under the constraints of the manufacturing resource capability center. Under the constraints of the existing manufacturing resource capability center of the enterprise, based on the manufacturing feature information XML file and the standard processing technology library, the processing technology decision is made on the features of the part. Through the reasoning method of production rules, the mapping between the manufacturing resource capability center and the standard processing technology is realized, providing support for the subsequent tool path generation of CNC automatic programming.

[0050] When making automatic processing decisions, the standard processing technology is parsed into a set of processing technology methods based on work steps according to the predefined standard processing technology library. The processing technology is:

[0051] Process = {WorkStep i / i∈N +} (3-1)

[0052] In the formula, Process represents the standard processing technology, and WorkStep represents the processing step. It includes not only the various parameters corresponding to the processing step, but also the company's mature programming processing technology rules. The processing step is:

[0053] WorkStep = {Para i , Rule j / i∈N + ,j∈N} (3-2)

[0054] Where Para is the parameter of the processing step, Rule is the constraint rule of the manufacturing resource capability center, and the manufacturing feature recognition information is a set of geometric information and non-geometric information, which can be expressed as:

[0055] FR={Geo i , Req j / i∈N + ,j∈N} (3-3)

[0056] In the formula, FR represents the manufacturing feature identification information, Geo represents the geometric information of the manufacturing feature, and Req represents the non-geometric information of the manufacturing feature. Processing process decision-making is to realize the association between enterprise resources and processing technology based on the constraints of the manufacturing resource capability center and the information of the standard processing technology. The processing direction of the manufacturing feature geometric information in the processing environment of the current manufacturing resource capability center is used to determine the processing technology mode of the manufacturing feature geometric information. Based on the attribute characteristics of the manufacturing feature geometric information, the processing step type of the processing feature geometric element is determined. When the processing step type of a manufacturing feature geometric element is determined, its corresponding parameter type is also determined at the same time, realizing the mapping of manufacturing features under the constraints of the manufacturing resource capability center and standard processing technology rules. The automatic decision of the standard processing technology can be expressed as:

[0057] f:FR→Process (3-4)

[0058] S5: Map the manufacturing feature recognition information with the CNC machining process, and finally obtain the machining process of the part.

[0059] The processing technology decision-making method matches the manufacturing feature information and the standard processing technology with the production rules in the processing technology rules. Under the constraints of the manufacturing resource capability center, the processing parameters corresponding to the processing steps are matched with the process requirements of the manufacturing features. The detailed decision-making process of the standard processing technology rules is as follows:

[0060] 1) Analysis of model manufacturing feature information: The model contains multiple manufacturing features. Considering the machining process rules and according to different machining process requirements, the manufacturing feature information is analyzed to obtain the geometric information attributes of the manufacturing features and map them with the standard machining process.

[0061] 2) Selection of standard machining process: Analyze the acquired manufacturing feature information to obtain the normal vector of each manufacturing feature, compare it with the machining normal vector, and determine the clamping method of the model. If the normal vector of the manufacturing feature is parallel to the machining normal vector, a three-axis machining method is adopted; if the normal vector of the manufacturing feature is perpendicular to the machining normal vector, a 3+2 machining method is adopted. In five-axis machining, the "3+2" machining method refers to a fixed-axis machining strategy in CNC machining.

[0062] 3) Processing sequence of manufacturing features: The determination of the processing sequence follows the CNC processing principles mentioned above: "rough first, then fine", "surface first, then hole", "inside first, then outside", and "process concentration".

[0063] 4) Process step decision of processing technology: A manufacturing feature will have multiple standard processing technologies mapped to it. Based on the obtained manufacturing feature information and the constraints of the manufacturing resource capability center, the most optimized processing technology is determined. It also includes multiple process steps. Each process step contains the corresponding CNC processing parameters and manufacturing resources. The manufacturing resources refer to tool information, machine tool information, and fixture information. These parameter information provides the basis for the subsequent call of general macro file templates and tool path production.

[0064] The beneficial effects of the present invention are as follows: the present invention can generate a processing method suitable for an enterprise according to the characteristics of its manufacturing resources. By introducing a standard processing technology library, the accumulated manufacturing experience of programmers can be passed on, thus avoiding repetitive work for novices, reducing human programming errors and loopholes, and making the allocation of the enterprise's manufacturing resources more reasonable. Through automatic programming of CNC machine tools, production management can be optimized, production cycle can be shortened, large-scale production can be achieved, the accuracy of CNC processing and the consistency of processing parameters can be ensured, and product value can be improved.

[0065] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A method for generating a standard processing technology based on the constraints of manufacturing resource capability centers, characterized by: The steps include: S1: Build an enterprise manufacturing resource capability center, which includes the manufacturing resource material layer, the manufacturing resource function layer, and the capability center layer; S2: Transfer the information of the manufacturing resource material layer to the manufacturing resource function layer, and transfer the information of the manufacturing resource function layer to the capability center to obtain the size and accuracy capability, shape capability, position and direction capability data of the capability center; S3: Build a standard processing technology library; according to the type of manufacturing features, establish a general table and a processing technology feature table of the standard processing technology library. The processing technology feature table is associated with the sub-feature table of each processing feature. Then, according to the different processing accuracy levels in the sub-feature table, the sub-feature accuracy level table of the database is created. Under the sub-feature accuracy, the processing procedures and each processing step are associated; S4: Establish an automatic decision-making process for processing technology; the decision-making process includes: 1) Analysis of model manufacturing feature information: obtaining the geometric information attributes of manufacturing features and mapping them with standard processing technology; 2) Selection of standard processing method: Analyze the acquired manufacturing feature information, obtain the normal vector of each manufacturing feature and compare it with the processing normal vector to determine the processing method; 3) Processing sequence of manufacturing features: The determination of the processing sequence follows the CNC processing principles: "roughing first, then finishing", "surface first, then hole", "interior first, then exterior", and "process concentration"; 4) Process step decision-making of the processing technology, determining the most optimized processing technology based on the obtained manufacturing feature information; S5: Map the manufacturing feature recognition information with the CNC machining process, and finally obtain the machining process of the part.

2. The method for generating a standard processing technology based on the constraints of a manufacturing resource capability center according to claim 1, characterized in that: The manufacturing resource material layer in S1 includes the stored material data of cutting tools, machine tools, and fixtures; the manufacturing resource function layer includes the information acquisition of the manufacturing resource function layer; the capability center layer is a description of the tool function information, machine tool function information, and fixture function information in the manufacturing resource function layer.

3. The method for generating a standard processing technology based on the constraints of a manufacturing resource capability center according to claim 1, characterized in that: In S2, the steps of information transmission between the manufacturing resource function layer and the capability center layer are as follows: Step 1: According to the actual factory production needs, obtain the information in the manufacturing resource function layer and configure the capability center; Step 2: According to the processing task requirements, determine whether the capability center meets the requirements. If it does not meet the requirements, reconfigure the capability center; Step 3: Call the capability center that meets the processing task requirements.

4. The method for generating a standard processing technology based on the constraints of a manufacturing resource capability center according to claim 1, characterized in that: In S2, the steps for information transmission between the manufacturing resource function layer and the capability center layer are as follows: Step 1: According to the actual factory production needs, obtain the information in the manufacturing resource function layer and configure the capability center; Step 2: According to the processing task requirements, determine whether the capability center meets the requirements. If it does not meet the requirements, reconfigure the capability center; Step 3: Call the capability center that meets the processing task requirements.

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