CN118426407B - Numerical control machine tool system for machining precise injection mold - Google Patents
Numerical control machine tool system for machining precise injection mold Download PDFInfo
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- CN118426407B CN118426407B CN202410840310.8A CN202410840310A CN118426407B CN 118426407 B CN118426407 B CN 118426407B CN 202410840310 A CN202410840310 A CN 202410840310A CN 118426407 B CN118426407 B CN 118426407B
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- G—PHYSICS
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- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
- G05B19/4097—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by using design data to control NC machines, e.g. CAD/CAM
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- G—PHYSICS
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- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
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Abstract
The invention relates to a numerical control machine tool system for machining a precise injection mold, and belongs to the technical field of numerical control machine tool systems. The system comprises a CAM system, a detection module, a measurement module, an execution module, an analysis module and a parameter optimization module which are in communication connection with the CAM system, wherein the CAM system provides a programming outline of an S-shaped test piece three-dimensional model, the execution module processes according to the programming outline, the measurement module measures the processing outline of the S-shaped test piece and records the processing outline, the detection module detects the wear degree and the temperature of a cutter in the processing process, the analysis module adopts a multiple regression model to analyze and determine the error weight according to the error between the processing outline and the programming outline and the detection result of the detection module, the parameter optimization module adjusts the execution parameters of the execution module in real time according to the multiple regression model, and the cutter path is monitored and optimized in real time through each module, so that the precision and the quality of a numerical control machine tool on the processing of the mould are improved, and meanwhile, the quality of a product produced through the mould is improved.
Description
Technical Field
The invention belongs to the technical field of numerical control machine tool systems, and particularly relates to a numerical control machine tool system for machining a precise injection mold.
Background
Building block toys, such as plastic particle building block toys, are currently on the market, and are generally connected by a fit interference between two parts. The tightness of the connection is realized through the fit tolerance of the parts. The connecting mode has the advantages that very high requirements are put on the precision manufacturing and injection molding production of the die, so that the production cost of building block parts is high, the consistency of the parts is poor, the building force is different, and finally, the use experience of users is poor.
In order to improve the machining precision of the die in the manufacturing process, the conventional numerical control machine tool generally generates an ideal machining path and shape through a CAM system, and the ideal machining path and shape are calculated based on a design model and requirements. The CAM system can automatically generate a machining path and a cutter path of the numerical control machine tool according to the three-dimensional model data of the workpiece, the simulated machining path and the programmed contour in the CAM system indicate machining precision when the error between the machining contour and the programmed contour in the actual machining process is small. Therefore, the precision of the die on the model in the processing process can be ensured, and the high-precision die manufacturing can be completed only by controlling the error in the processing process.
However, in the actual machining process, the machining profile is affected by various factors, wherein factors mainly causing errors are classified into static errors and dynamic errors. The static error can be directly detected by a laser interferometer, a cue instrument, an R-test instrument and the like. The dynamic error detection is widely applied to the existing S-shaped test piece in the industry to detect the dynamic error of the machine tool, and the die precision in the final machining process is controlled by the detected dynamic error, but because the causes and components of the dynamic error are complex, the thermal error, the system control error and the like are included, wherein the influence of the thermal error of the machine tool on the machining precision of the part accounts for about 40% -70% of the total machining error of the machine tool, and therefore, the error range of the die cannot be accurately controlled in the high-precision die manufacturing process.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a numerical control machine tool system for processing a precise injection mold, which solves the problem that the error range of the mold cannot be accurately controlled due to the influence of dynamic errors in the process of manufacturing the high-precision mold by the conventional numerical control machine tool.
The aim of the invention can be achieved by the following technical scheme: the utility model provides a digit control machine tool system of accurate injection mold processing, includes CAM system and with CAM system communication connection' S detection module, measuring module, execution module, analysis module and parameter optimization module, the CAM system provides the programming profile of S-shaped test piece three-dimensional model, execution module processes according to the programming profile, measuring module measures the processing profile of S-shaped test piece and records, the detection module detects the degree of wear and temperature of cutter in the course of working, analysis module adopts multiple regression model to carry out analysis and confirm error weight according to the testing result of error and detection module between processing profile and the programming profile, parameter optimization module adjusts the execution parameter of execution module in real time according to multiple regression model.
As a preferable technical scheme of the invention, the detection module comprises a visual detection unit and an infrared detection unit, wherein the visual detection unit monitors the abrasion of the cutter in real time, and the infrared detection unit detects the temperature in the machine tool in real time.
As a preferable technical scheme of the invention, the automatic cutting machine further comprises a compensation module, wherein the compensation module adjusts the length parameters of the cutting tool in the programming profile in real time according to the error weight of the analysis module and the detection result of the detection module.
As a preferred technical scheme of the invention, the error between the processing profile and the programming profile in the multiple regression model is taken as a dependent variable, and the wear degree of the cutter and the temperature of the cutter in the processing process are taken as independent variables respectively.
As a preferable technical scheme of the invention, the measurement items of the measurement module comprise S-shaped flange thickness errors, S-shaped flange dents, convex edges, local defects of vibration marks and S-shaped flange contour errors.
As a preferable technical scheme of the invention, the measuring module obtains three-dimensional data points of the workpiece by scanning the S-shaped test piece through laser and converts the three-dimensional data points into three-dimensional contours.
As a preferred embodiment of the present invention, the execution parameters of the execution module include a positioning parameter of a linear axis of the machine tool and a coordinate parameter of a rotation axis.
As a preferable technical scheme of the invention, the automatic machine tool linear axis measuring device further comprises an interpolation module, wherein the interpolation module adjusts the execution parameters of the machine tool linear axis in the execution module according to the measurement result of the measurement module and the error weight of the analysis module.
As a preferable technical scheme of the invention, the CAM system, the detection module, the measurement module, the execution module, the analysis module, the interpolation module and the parameter optimization module are respectively connected through a Modbus protocol.
The beneficial effects of the invention are as follows: the method comprises the steps of providing a programming contour of an S-shaped test piece through a CAM system, enabling an execution module to process according to the programming contour and measure through a measuring module to obtain a processing contour, detecting the abrasion degree and the temperature of a cutter in the processing process through a detecting module, analyzing errors between the processing contour and the programming contour and detecting results of the detecting module through a multiple regression model and determining weights of error factors, adjusting execution parameters in the execution module in real time through a parameter optimizing module according to the weights of all factors, and carrying out real-time monitoring and cutter path optimization on the cutter through cooperative cooperation of all the modules, so that the precision and the quality of a numerical control machine tool in die processing are improved, the quality of products produced through dies is further improved, and the problem that the error range of the die cannot be accurately controlled due to the influence of dynamic errors in the process of manufacturing high-precision dies of the existing numerical control machine tool is solved.
Drawings
The present invention is further described below with reference to the accompanying drawings for the convenience of understanding by those skilled in the art.
FIG. 1 is a schematic diagram of a numerically controlled machine tool system of the present invention;
Detailed Description
In order to further describe the technical means and effects adopted by the invention for achieving the preset aim, the following detailed description is given below of the specific implementation, structure, characteristics and effects according to the invention with reference to the attached drawings and the preferred embodiment.
Before manufacturing the high-precision die, the numerical control machine tool firstly carries out an S-shaped test piece to obtain the dynamic error of the machine tool, then the execution parameters of the machine tool are adjusted in real time according to the dynamic error, and the machining precision of the numerical control machine tool is ensured through the precision of the S-shaped test piece which appears in machining, so that the machining error range of the die can be accurately controlled when the high-precision die is machined in the follow-up process. Because the detection of the S-shaped test piece has been incorporated into the ISO10791-7 standard, in order to ensure that the processing error range of the die can be accurately controlled in the manufacturing process of the high-precision die, referring to fig. 1, the embodiment provides a numerically-controlled machine tool system for processing the precision injection die, which comprises a CAM system, and a detection module, a measurement module, an execution module, an analysis module and a parameter optimization module which are in communication connection with the CAM system, wherein data interfaces among the modules transmit parameters, results and information, so that data sharing and flow control among the modules are realized. Through connection, the organic whole can be formed between each module, data sharing, transmission and processing can be achieved, the CAM system provides the programming outline of the three-dimensional model of the S-shaped test piece, then the execution module processes according to the programming outline, in the process of processing, the measurement module measures and records the processing outline of the S-shaped test piece, the detection module simultaneously detects the abrasion degree and the temperature of a cutter in the process of processing, meanwhile, the measurement module and the detection module can transmit obtained data to the analysis module in real time, the analysis module analyzes errors between the processing outline and the programming outline and the detection result of the detection module by adopting the multiple regression model and determines the error weight, and then the parameter optimization module adjusts the execution parameters of the execution module in real time according to the multiple regression model in the analysis module, so that the processing of the S-shaped test piece is completed, and meanwhile, the processing error of a machine tool in the process of processing can be compensated in real time, and the influence of dynamic error on the processing process is reduced.
In the machining process, the abrasion of the cutter and the error between the machining profile and the programming profile are main factors causing machining errors, meanwhile, the abrasion of the cutter is mainly influenced by the thermal errors of the machine tool, because the cutter can generate higher temperatures in the continuous cutting process in the machining process, the temperatures can further accelerate the abrasion degree of the cutter, meanwhile, the temperature can also cause thermal expansion and cold contraction of the machine tool to cause the generation of errors, and the analysis module judges that the abrasion of the cutter and the temperature have larger influence on the errors caused by the integral machining precision according to the errors between the machining profile and the programming profile, so that the parameter optimization module adjusts the abrasion of the cutter, and improves the machining precision of the numerical control machine tool.
In the process of manufacturing a die, the existing numerical control machine tool is crucial to ensure consistency of a programmed contour and a machining contour. Because the consistency of the programmed contours with the machined contours means the degree of compliance of the actual machining results with the design intent. If the two are consistent in height, the machining precision is high, and the product quality is good; conversely, if there is a large deviation, it may result in product quality not reaching standards, or even causing waste. Therefore, the error between the two is used as a correction standard, thereby improving the machining precision in the machining process.
For better detecting the degree of wear of cutter and the temperature in the lathe, reduce the machining error that detection error brought simultaneously, in this embodiment, detection module includes visual detection unit and infrared detection unit, and visual detection unit carries out real-time supervision to cutter wearing and tearing, and the temperature in the infrared detection unit real-time detection lathe carries out real-time detection to the degree of wear of cutter and the temperature in the lathe respectively through visual detection unit and infrared detection unit to reduce the detection error that brings by detection module self, thereby avoid causing the influence to the machining precision.
When the parameter optimization module adjusts the execution parameters of the execution module, if the tool wear weight is larger at the moment, in order to reduce machining errors caused by tool wear, in an embodiment, the parameter optimization module further comprises a compensation module, the compensation module adjusts the length parameters of the tool in the programming profile in real time according to the error weight of the analysis module and the detection result of the detection module, and when errors caused by tool wear exceed the machining error range, the compensation module adjusts the length of the tool in the programming profile, so that the positions of the tools in the subsequent machining profile are corrected, and machining errors caused by tool wear are reduced.
In order to enable the analysis module to output the optimal parameter combination, thereby realizing the accurate control of the numerical control machine tool machining, in one embodiment, the error between the machining profile and the programming profile in the multiple regression model is taken as a dependent variable, the wear degree of the cutter and the temperature of the cutter in the machining process are respectively taken as independent variables, the two variables are substituted into the regression model, and the model is fitted, namely the weight of each error factor is determined. And through the determined weight value, unknown data can be predicted, so that error results possibly generated under different error factor combinations are predicted, and the optimal parameter combination is optimized and output. Thereby improving the processing precision.
In order to better obtain the dynamic error of the machine tool by processing the S-shaped test piece and reduce the dynamic error of the machine tool by carrying out real-time parameter adjustment on the execution module, in one embodiment, the measurement items of the measurement module comprise the thickness error of the S-shaped flange strip, the local defects of the S-shaped flange strip, the convex edge and the vibration mark and the contour error of the S-shaped flange strip, because the S-shaped test piece is a special processing part similar to the S-shaped, the S-shaped test piece has a complex shape consisting of two bending planes, and the S-shaped test piece can be used for detecting the dynamic error of the five-axis machine tool on different coordinate axes. When the S-shaped test piece is processed on a machine tool workbench, the errors of all the shafts can be displayed and recorded in the processing process due to the special shape and large curvature change, and the errors can be corrected by dynamic compensation software. Therefore, the errors of all shafts of the machine tool in the actual machining process can be achieved by detecting the thickness errors of the S-shaped rim strips, the local defects of the S-shaped rim strip dents, the convex edges and the vibration marks and the contour errors of the S-shaped rim strips, and the overall machining precision is improved.
In order to avoid the influence of errors caused by detection results on the S-shaped test piece on the adjusted parameter values, in one embodiment, a measuring module scans the S-shaped test piece through laser to obtain three-dimensional data points of a workpiece, converts the three-dimensional data points into three-dimensional contours, collects the three-dimensional data points of the contours of the workpiece in a laser scanning mode, and simulates the three-dimensional processing contours of the workpiece according to the three-dimensional data points; and the comparison between the processing contour and the programming contour is completed, and the error between the two contours is obtained, so that the execution parameters of the execution module are adjusted.
And meanwhile, a phase scanner is selected for laser scanning, and the continuous wave laser and a phase measurement technology are utilized to acquire the point cloud data of the surface of the workpiece. The continuous wave laser emitted by the laser can be reflected after touching the surface of the workpiece, and the distance and angle information between the surface point of the workpiece and the laser emitter can be calculated by comparing the phase difference between the reflected laser wave and the reference laser wave, so that a three-dimensional model of the workpiece is constructed. The measuring and analyzing unit is preferably equipped with Geomagic Qualify software to calculate the difference between the machining profile and the programmed profile.
In order to better adjust the parameters in the execution module to improve the machining precision, in one embodiment, the execution parameters of the execution module include a positioning parameter of a linear axis of the machine tool and a coordinate parameter of a rotating shaft, wherein the linear axis, the rotating shaft and the spindle of the machine tool are three important parts of the machine tool respectively.
A linear axis: a linear axis is an axis of linear motion on a machine tool and typically includes an X-axis, a Y-axis, and a Z-axis. They realize the linear movement of the work piece by the linear guide rail or the sliding block movement. The linear shaft is often faced with the problem of thermal errors, mainly because the machine tool can generate heat during working, so that the linear shaft expands to a certain extent, and the machining precision is affected. A rotation axis: the rotating shaft is a shaft for rotating on a machine tool and comprises an A shaft, a B shaft, a C shaft and the like. The rotation of the workpiece in different directions can be realized by different rotation shafts, so that the machine tool can process multiple angles and multiple directions. The axes of rotation are also subject to thermal errors, but they are generally less affected than the linear axes. A main shaft: the spindle is one of the most important parts on a machine tool, which can realize the rotary machining of a workpiece. The spindle is usually run in or carefully machined to achieve the accuracy requirements. The rotational speed and accuracy of the spindle have very important effects on the quality and efficiency of the process. Heat is also generated during high-speed operation of the spindle, but thermal errors of the spindle are smaller with respect to the linear axis and the rotation axis.
Therefore, when the parameters in the execution module are adjusted, the errors generated in the machining process are reduced by adjusting the positioning parameters of the linear shaft of the machine tool and the coordinate parameters of the rotating shaft, so that the machined part can be within the error range.
Because the temperature in the machine tool has the greatest influence on the linear axis and is also the parameter with the greatest influence on the machining precision, in order to further reduce the machining error caused by the linear axis, in one embodiment, the machine tool further comprises an interpolation module, the interpolation module adjusts the execution parameters of the linear axis of the machine tool in the execution module according to the measurement result of the measurement module and the error weight of the analysis module, the numerical control system calculates the position, the speed and the acceleration of each axis for each time step according to the input tool path and the machining path, and controls the servo system to accurately move according to the appointed path, and the interpolation module adjusts the execution parameters of the linear axis of the machine tool in the execution module according to the error weight analyzed by the analysis module, so that the error caused by the influence of the temperature on the linear axis is further reduced.
Because the data connection needs to be performed between each module, in order to reduce the influence on processing precision caused by the fact that data cannot be transmitted in time due to factors such as delay and network fluctuation in the data transmission process, in one embodiment, a CAM system, a detection module, a measurement module, an execution module, an analysis module, a compensation module, an interpolation module and a parameter optimization module are respectively connected through a Modbus protocol, and the Modbus protocol has a simple structure and is easy to realize and understand. The communication reliability is guaranteed by using standard CRC, the Modbus protocol supports various physical media and communication modes, including serial ports, ethernet and the like, communication can be carried out between different platforms and devices, and meanwhile, the Modbus protocol supports master-slave mode and multipoint communication, so that communication and collaborative work among a plurality of devices can be realized. Meanwhile, the method also supports batch read-write operation of a plurality of registers, improves communication efficiency, and therefore, processing errors caused by data transmission can be avoided by completing data transmission through the Modbus protocol.
The present invention is not limited in any way by the above-described preferred embodiments, but is not limited to the above-described preferred embodiments, and any person skilled in the art will appreciate that the present invention can be embodied in the form of a program for carrying out the method of the present invention, while the above disclosure is directed to equivalent embodiments capable of being altered or modified in a slight manner, any and all concise modifications, equivalent variations and alterations of the above embodiments are still within the scope of the present disclosure, all as may be made without departing from the scope of the present disclosure.
Claims (7)
1. A numerical control machine tool system for processing a precise injection mold is characterized in that: the system comprises a CAM system, a detection module, a measurement module, an execution module, an analysis module and a parameter optimization module, wherein the detection module, the measurement module, the execution module, the analysis module and the parameter optimization module are in communication connection with the CAM system, the CAM system provides a programming contour of an S-shaped test piece three-dimensional model, the execution module processes according to the programming contour, the measurement module measures and records the processing contour of the S-shaped test piece, the detection module detects the wear degree and the temperature of a cutter in the processing process, the analysis module adopts a multiple regression model to analyze and determine the weight of an error factor according to the error between the processing contour and the programming contour and the detection result of the detection module, and the parameter optimization module adjusts the execution parameter of the execution module in real time according to the multiple regression model;
the error between the processing contour and the programming contour in the multiple regression model is used as a dependent variable, and the abrasion degree of the cutter and the temperature of the cutter in the processing process are respectively used as independent variables;
The measurement items of the measurement module comprise S-shaped flange thickness errors, S-shaped flange dents, convex edges, local defects of vibration marks and S-shaped flange contour errors.
2. The numerically-controlled machine tool system for precision injection mold processing according to claim 1, wherein: the detection module comprises a visual detection unit and an infrared detection unit, wherein the visual detection unit monitors the abrasion of the cutter in real time, and the infrared detection unit detects the temperature in the machine tool in real time.
3. The numerically-controlled machine tool system for precision injection mold processing according to claim 2, wherein: the device also comprises a compensation module, wherein the compensation module adjusts the length parameters of the cutter in the programming profile in real time according to the error weight of the analysis module and the detection result of the detection module.
4. The numerically-controlled machine tool system for precision injection mold processing according to claim 1, wherein: and the measuring module scans the S-shaped test piece through laser to obtain three-dimensional data points of the workpiece, and converts the three-dimensional data points into three-dimensional contours.
5. The numerically-controlled machine tool system for precision injection mold processing according to claim 1, wherein: the execution parameters of the execution module comprise the positioning parameters of a machine tool linear shaft and the coordinate parameters of a rotating shaft.
6. The numerically-controlled machine tool system for precision injection mold processing as in claim 5, wherein: the machine tool linear axis measuring device comprises a measuring module, an analyzing module and an interpolation module, wherein the measuring module is used for measuring the measuring result of the measuring module and analyzing the error weight of the measuring module.
7. The numerically-controlled machine tool system for precision injection mold processing according to claim 1, wherein: the CAM system, the detection module, the measurement module, the execution module, the analysis module, the interpolation module and the parameter optimization module are respectively connected through a Modbus protocol.
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