CN107272581B - Machine tool motion compensation system based on temperature value analysis - Google Patents
Machine tool motion compensation system based on temperature value analysis Download PDFInfo
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- CN107272581B CN107272581B CN201710492478.4A CN201710492478A CN107272581B CN 107272581 B CN107272581 B CN 107272581B CN 201710492478 A CN201710492478 A CN 201710492478A CN 107272581 B CN107272581 B CN 107272581B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- 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
- G05B19/404—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 control arrangements for compensation, e.g. for backlash, overshoot, tool offset, tool wear, temperature, machine construction errors, load, inertia
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- 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
- G05B19/401—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 control arrangements for measuring, e.g. calibration and initialisation, measuring workpiece for machining purposes
Abstract
The invention discloses a machine tool motion compensation system based on temperature value analysis, which comprises: the model establishing module is used for establishing a time difference deformation model; the information acquisition module is used for acquiring the temperature of the target movement axis of the machine tool and recording the time t when the target movement axis reaches the first temperature1Time t of the second temperature2(ii) a The error compensation module is used for calculating the time difference t and the current deformation L and carrying out error compensation on the target motion axis according to the current deformation L and the error allowable range. The invention analyzes the temperature change condition of the moving axis of the machine tool by detecting the time consumed by the temperature rise of the moving axis of the machine tool, then defines the deformation quantity according to the temperature change condition of the moving axis of the machine tool, and then formulates the error compensation strategy of the moving axis of the machine tool according to the actual deformation quantity, considers the three factors of the temperature change, the deformation quantity and the compensation quantity, and improves the effectiveness of error compensation on the basis of ensuring the accuracy of the analysis result of the temperature change step by step, thereby ensuring the processing accuracy of the machine tool.
Description
Technical Field
The invention relates to the technical field of machine tool motion compensation systems, in particular to a machine tool motion compensation system based on temperature value analysis.
Background
The numerical control machine tool is important equipment in the manufacturing field, and the processing performance of the numerical control machine tool is one of main marks of the development level of the national manufacturing industry. In the machining process of the machine tool, due to thermal errors caused by unbalanced temperature rise of all parts of the machine tool, the relative correct position between the cutter and the workpiece is changed, and the machining errors of the workpiece are caused. According to statistics, the thermal error of the numerical control machine tool accounts for about 40-70% of the total error of the machine tool. The processing method of modeling the thermal error data of the machine tool and compensating in advance through a numerical control system is an effective and economic means for improving the machining precision of the machine tool.
In the process of improving the machining precision of the machine tool, higher requirements are placed on the precision of temperature acquisition of the target position and the accuracy of temperature change analysis.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a machine tool motion compensation system based on temperature value analysis.
The invention provides a machine tool motion compensation system based on temperature value analysis, which comprises:
the model establishing module is used for establishing a time difference deformation model;
the information acquisition module is used for acquiring the temperature of the target motion axis of the machine tool and recording the time t when the target motion axis reaches the first temperature1Time t of the second temperature2(ii) a Wherein the first temperature is less than the second temperature;
the error compensation module is used for calculating the time difference t, calculating the current deformation quantity L based on the time difference deformation model, judging whether the current deformation quantity L exceeds an error allowable range, and performing error compensation on the target motion axis according to a judgment result; wherein t is t2-t1。
Preferably, the time difference deformation model established in the model establishing module is:
preferably, in the information acquisition module, acquiring the temperature of the movement axis of the machine tool target specifically includes:
acquiring the temperature of a machine tool target motion axis by utilizing a plurality of temperature acquisition sub-modules, wherein each temperature acquisition sub-module comprises a plurality of temperature sensors;
preferably, the temperature sensor is an infrared temperature sensor.
Preferably, the error compensation module is specifically configured to:
according to the current deformation L and the preset deformation L0Comparing to judge whether L exceeds the error allowable range, and when L is less than or equal to xL0When the L is within the error allowable range, the L is judged to be within the error allowable range without error compensation, and when the L is within the error allowable range, the L is judged to be within the error allowable range>xL0When the deformation quantity L exceeds the allowable error range, judging that the L exceeds the allowable error range and performing error compensation, wherein the error compensation value is the current deformation quantity L;
wherein x is a preset value and x > 1.
Preferably, the system further comprises an abnormity warning module;
when t is less than or equal to ytaWhen the temperature of the machine tool target moving axis is higher than the preset temperature, the abnormity warning module starts temperature abnormity warning and displays the current temperature T of the machine tool target moving axis;
wherein 0< y < 1.
The invention analyzes the temperature change condition of the moving axis of the machine tool by detecting the time consumed by the temperature rise of the moving axis of the machine tool, thereby defining the deformation quantity according to the temperature change condition of the moving axis of the machine tool and further formulating the error compensation strategy of the moving axis of the machine tool according to the actual deformation quantity. Specifically, the method comprises the following steps: the method is provided with two temperatures, the time consumed by the moving shaft of the machine tool for rising from the first temperature to the second temperature is recorded, and the heating state and the actual temperature range of the moving shaft of the machine tool are obtained by analyzing the length of the consumed time, so that the deformation quantity is divided for the machine tool according to the actual temperature state of the moving shaft of the machine tool, and the error compensation is carried out on the moving shaft of the machine tool by judging the range of the deformation quantity; in the process of analyzing the actual temperature state of the machine tool movement axis, the time consumed by the movement axis of the machine tool to rise from the first temperature to the second temperature is recorded, the temperature rise condition of the movement axis is analyzed by judging the temperature rise rate of the movement axis based on the actual temperature condition of the machine tool, the actual temperature of the machine tool is taken as a temperature investigation reference, the temperature analysis precision is improved based on the self state of the machine tool, the influence of external factors on the temperature acquisition result is avoided, and an effective reference basis is provided for subsequent deformation quantity analysis and error compensation planning, so that the processing precision of the machine tool and the processing quality of products are ensured.
Drawings
Fig. 1 is a schematic structural diagram of a machine tool motion compensation system based on temperature value analysis.
Detailed Description
As shown in fig. 1, fig. 1 is a diagram of a motion compensation system of a machine tool based on temperature value analysis according to the present invention.
Referring to fig. 1, the present invention provides a machine motion compensation system based on temperature value analysis, including:
the model establishing module is used for establishing a time difference deformation model;
the information acquisition module is used for acquiring the temperature of the target motion axis of the machine tool and recording the time t when the target motion axis reaches the first temperature1Time t of the second temperature2(ii) a Wherein the first temperature is less than the second temperature;
in the embodiment, the information acquisition module acquires the temperature of the machine tool target motion axis by using the plurality of temperature acquisition sub-modules, and the temperature of the machine tool target motion axis can be acquired from different positions and different angles by using the plurality of temperature acquisition sub-modules, so that the comprehensiveness of temperature acquisition is improved, and the precision of temperature acquisition can be improved; each temperature acquisition submodule comprises a plurality of temperature sensors, and comprehensiveness and accuracy of temperature acquisition can be further improved by utilizing the plurality of temperature sensors; preferably, the temperature sensor is an infrared temperature sensor.
The error compensation module is used for calculating the time difference t, calculating the current deformation quantity L based on the time difference deformation model, judging whether the current deformation quantity L exceeds an error allowable range, and performing error compensation on the target motion axis according to a judgment result; wherein t is t2-t1。
The error compensation module is specifically configured to:
according to the current deformation L and the preset deformation L0Comparing to judge whether L exceeds the error allowable range, and when L is less than or equal to xL0When the target motion axis is in the error allowable range, the error compensation module judges that the L is in the error allowable range and does not need to perform error compensation, and when the L is in the error allowable range, the current deformation of the target motion axis is smaller>xL0The method comprises the steps that when the current deformation of a target motion axis of the machine tool is larger, in order to avoid the influence of the deformation on the machining precision of the machine tool, an error compensation judgment L exceeds an error allowable range and carries out error compensation, and the error compensation value is the current deformation L, so that the machining precision of the machine tool is kept in a stable range, and the precision and the quality of a product machined by the machine tool are improved; wherein x is a predetermined value and x>1。
In this embodiment, the time difference deformation model established in the model establishing module is:
when the time t for raising the temperature of the target moving shaft of the machine tool from the first temperature to the second temperature is not more than taWhen the temperature of the target moving shaft is higher than the set temperature, L is distributed to the target moving shaft when the deformation of the target moving shaft is larger, namely the temperature of the target moving shaft is higher than the set temperature of the target moving shaft1As the amount of deformation; when the temperature of the target moving shaft of the machine tool is increased from the first temperature to the second temperature, t is not less than tbThe time shows that the temperature of the target moving shaft rises slowly and the time consumed is longer, and a smaller deformation quantity L is distributed to the target moving shaft at the time3(ii) a Tong (Chinese character of 'tong')And analyzing the rising time of the temperature of the target motion axis of the machine tool to divide the actual temperature of the target motion axis and distribute corresponding deformation quantity for the actual temperature, thereby providing a reference for the error compensation module to perform error compensation. The time difference deformation model can be formulated according to the actual running state and the temperature change condition of the machine tool, and the accuracy of deformation quantity division can be effectively improved.
In a further embodiment, the system further comprises an anomaly warning module;
when t is less than or equal to ytaWhen the temperature of the moving axis of the machine tool is lower than the first temperature, the abnormal warning module starts temperature abnormality early warning to remind relevant workers of paying attention to the abnormal temperature of the moving axis of the machine tool, and the abnormal display module displays the current temperature T of the moving axis of the machine tool, so that the relevant workers can conveniently check the actual temperature of the moving axis of the machine tool and adopt corresponding coping strategies to ensure the normal running state of the machine tool; wherein, 0<y<1。
The temperature change condition of the moving shaft of the machine tool is analyzed by detecting the time consumed by the temperature rise of the moving shaft of the machine tool, so that the deformation quantity is defined according to the temperature change condition of the moving shaft of the machine tool, and then the error compensation strategy of the moving shaft of the machine tool is formulated according to the actual deformation quantity. Specifically, the method comprises the following steps: in the embodiment, two temperatures are set, the time consumed by the movement axis of the machine tool for rising from the first temperature to the second temperature is recorded, and the heating state and the actual temperature range of the movement axis of the machine tool are obtained by analyzing the length of the consumed time, so that the deformation quantity is divided for the machine tool according to the actual temperature state of the movement axis of the machine tool, and the error compensation is carried out on the movement axis of the machine tool by judging the range of the deformation quantity; in the process of analyzing the actual temperature state of the machine tool movement axis, the time consumed by the movement axis of the machine tool to rise from the first temperature to the second temperature is recorded, the temperature rise condition of the movement axis is analyzed by judging the temperature rise rate of the movement axis based on the actual temperature condition of the machine tool, the actual temperature of the machine tool is taken as a temperature investigation reference, the temperature analysis precision is improved based on the self state of the machine tool, the influence of external factors on the temperature acquisition result is avoided, and an effective reference basis is provided for subsequent deformation quantity analysis and error compensation planning, so that the processing precision of the machine tool and the processing quality of products are ensured.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (5)
1. A machine tool motion compensation system based on temperature value analysis, comprising:
the model establishing module is used for establishing a time difference deformation model;
the information acquisition module is used for acquiring the temperature of the target motion axis of the machine tool and recording the time t when the target motion axis reaches the first temperature1Time t of the second temperature2(ii) a Wherein the first temperature is less than the second temperature;
the error compensation module is used for calculating the time difference t, calculating the current deformation quantity L based on the time difference deformation model, judging whether the current deformation quantity L exceeds the allowable range of thermal errors or not, and performing thermal error compensation on the target motion axis according to the judgment result; wherein t is t2-t1；
The time difference deformation model established in the model establishing module is as follows:
2. the system for compensating motion of a machine tool based on temperature value analysis according to claim 1, wherein the information collection module specifically collects the temperature of the motion axis of the target of the machine tool comprises:
the temperature of the machine tool target motion axis is acquired by a plurality of temperature acquisition sub-modules, and each temperature acquisition sub-module comprises a plurality of temperature sensors.
3. The system of claim 2, wherein the temperature sensor is an infrared temperature sensor.
4. The temperature value analysis-based machine tool motion compensation system of claim 1, wherein the error compensation module is specifically configured to:
according to the current deformation L and the preset deformation L0Comparing to determine whether L exceeds the allowable range of thermal error, and determining if L is less than or equal to xL0When the thermal error is within the allowable range, the thermal error compensation is not needed, and when the thermal error is within the allowable range, the L is judged>xL0Judging that L exceeds a thermal error allowable range and performing thermal error compensation, wherein a thermal error compensation value is the current deformation L;
wherein x is a preset value and x > 1.
5. The system for compensating motion of a machine tool based on temperature value analysis according to claim 1, further comprising an abnormality warning module;
when t is less than or equal to ytaWhen the temperature of the machine tool target moving axis is higher than the preset temperature, the abnormity warning module starts temperature abnormity warning and displays the current temperature T of the machine tool target moving axis;
wherein 0< y < 1.
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Address after: Building 2, No. 379, Xinwu Economic Development Zone, Wuhu County, Wuhu City, Anhui Province, 241100 Patentee after: Anhui Jieyongda Intelligent Machinery Co.,Ltd. Address before: 241100 Jing Er Road, New Wuhu Economic Development Zone, Wuhu County, Wuhu City, Anhui Province Patentee before: ANHUI PROVINCE JIEYONGDA INTELLIGENT MACHINE CO.,LTD. |