CN101972948B - Test device for thermal error of machine tool spindle under simulated work load condition - Google Patents
Test device for thermal error of machine tool spindle under simulated work load condition Download PDFInfo
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- CN101972948B CN101972948B CN2010102922890A CN201010292289A CN101972948B CN 101972948 B CN101972948 B CN 101972948B CN 2010102922890 A CN2010102922890 A CN 2010102922890A CN 201010292289 A CN201010292289 A CN 201010292289A CN 101972948 B CN101972948 B CN 101972948B
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Abstract
The invention discloses a test device for the thermal error of a machine tool spindle under a simulated work load condition. The test device comprises a spindle thermal error test system and a loading device for a spindle under a simulated work load condition; the loading device comprises a moment load loading device and a radial force load loading device; the moment load loading device comprises a magnetic powder brake which applies the simulated moment load onto the spindle through a guide bar and a check bar; the radial force load loading device comprises a tension/pressure meter; and a radial force adjustment bolt extrudes the tension/pressure meter to generate a simulated radial force load and applies the simulated radial force load onto the spindle through the rolling contact amonga radial force guide bar, a rolling bearing and the check bar. The invention can obtain the spindle thermal state characteristics and a thermal error model under the approximately real processing work conditions, and provides a practically feasible test device for the precision prediction, precision design and thermal error compensation of the machine tool spindle.
Description
Technical field
The present invention relates to the numerical control machine tool technique field, the hot error test device of machine tool chief axis under particularly a kind of simulated condition load-up condition.
Background technology
The error source of Digit Control Machine Tool mainly comprises geometric error, hot error, load error and control systematic error, and wherein, geometric error and hot error account for the 40%-70% of error total amount.For high-grade, digitally controlled machine tools; Because the heat that the high-speed driving parts produce is higher than traditional machine tool far away; And because its supporting each parts machining accuracy, assembly precision and self rigidity is higher; The load error proportion that geometric error and cutting force cause reduces, and therefore hot error proportion is bigger, becomes the main factor that influences machining accuracy.At present to the hot error testing of main shaft under the Digit Control Machine Tool idle condition, the existing big quantity research of modeling and simulation analysis.But; Under the processing operating mode; Because caused main shaft temperature rise of chip-load and thermal deformation are difficult to be embodied in the main shaft thermal characteristics and hot error test model under the idle condition; The main shaft thermal field balance of idle condition is inconsistent with the main shaft thermal field balance of processing operating mode; And issuable coupling effect between machine tool thermal step response and dynamic characteristic and the load, the hot error model under the Light Condition is difficult to reflect real thermal characteristic of main shaft and hot error condition usually, thereby under reality processing working condition, is difficult to obtain satisfied error compensation effect; And truly process the real-time in-line testing that can't carry out machine tool thermal error under the operating mode; Therefore thermal characteristic and the hot error of thermal characteristic to further understanding main shaft in depth of lathe under the research simulation operating loading condition improves the heat error compensation effect of Digit Control Machine Tool, to improve the machining accuracy of lathe conscientiously significant.
Summary of the invention
The present invention provides a kind of experimental rig that can carry out the hot error test of machine tool chief axis under the simulated condition load-up condition for solving the technical problem that exists in the known technology, is used to study thermal characteristic and the hot error of machine tool chief axis under operating loading.
The technical scheme that the present invention takes for the technical problem that exists in the solution known technology is: the hot error test device of machine tool chief axis under a kind of simulated condition load-up condition comprises the hot error testing pilot system of simulated condition load main shaft charger and main shaft; Said main shaft charger comprises torque load charger and radial load load charger; Said torque load charger comprises magnetic powder brake; Said magnetic powder brake is installed on the charger support; Said magnetic powder brake is connected with check rod through feather key; Said check rod is connected with said main shaft, and said magnetic powder brake will be simulated torque load through said feather key and said check rod and is applied on the said main shaft; Said radial load load charger comprises the pressure meter; Said pressure meter is installed on the radial load charger supporting mass; Said radial load charger supporting mass is fixedly connected with said charger support; Said pressure meter is provided with and receives pull end and pressurized end; The pull end that receives of said pressure meter is provided with radial load adjustment bolt, and said pressure meter pressurized end is provided with the radial load guide rod, and the pressure meter end far away of said radial load guide rod is equipped with rolling bearing; Said rolling bearing rolls with said check rod and is connected, and said radial load adjustment bolt will be simulated radial load load and be applied on the said main shaft through being pushed said pressure meter and produce simulation radial load load and contacting through said radial load guide rod, said rolling bearing and the rolling of said check rod; Said charger support is provided with vertical installed surface and horizontal mounting surface;
The hot error testing pilot system of said main shaft is through being installed in eddy current displacement sensor and the hot error of the said main shaft of said check rod non-cpntact measurement on the sensor stand, and said sensor stand is provided with vertical installed surface and horizontal mounting surface;
The hot error testing pilot system of said main shaft is measured temperature through the thermal resistance that is installed in said main shaft detected part; Said thermal resistance is installed in the detected part of said main shaft through magnetic support; Said magnetic support comprises fixed cover and magnetosheath; Said thermal resistance is threaded with said fixed cover, and said magnetic support is adsorbed on said main shaft surface through the magnetic force of said magnetosheath; The test lead of said thermal resistance contacts with surface, the tested position of main shaft, perhaps is inlaid in the measured hole of said main shaft tested position setting, and contacts with said measured hole bottom surface.
Said radial load guide rod is contained in the radial load guide pin bushing, and said radial load guide pin bushing is fixed on the said radial load charger supporting mass.
Advantage and good effect that the present invention has are:
1) main shaft simulated condition load loads with detected part temperature, the hot error measure of main shaft and carries out synchronously; Can obtain main shaft thermal characteristic and hot error model under the approximate true processing working condition, for accuracy prediction, accuracy Design and the heat error compensation of machine tool chief axis provides a kind of practicable experimental rig and means;
2) the simulation torque load that is produced by magnetic powder brake can be regulated magnitude of load through exciting current; Simulation radial load load by the pressure meter produces can be regulated magnitude of load through the change in displacement of radial load adjustment bolt; Thereby can simulate the chip-load under the true processing operating mode in the certain limit, make that simulated condition load and real working condition load are more approaching;
3) the hot error testing device of simulated condition load main shaft charger and main shaft need not other auxiliary mounting bracket, promptly applicable to the machine tool chief axis of horizontally-mounted machine tool chief axis and vertical installation;
4) thermal resistance that is used for measuring the main shaft temperature rise can be installed in the annular surface or the instrument connection of main shaft detected part easily through magnetic support, and it is simple to make main shaft temperature measure.
Description of drawings
Fig. 1 is test principle figure of the present invention;
Fig. 2 is the hot error test device of machine tool chief axis under the horizontal simulated condition load-up condition that is installed on the main shaft testing stand;
Fig. 3 is the hot error test device of machine tool chief axis under the vertical simulated condition load-up condition that is installed on the platen;
Fig. 4 is simulation moment load charger;
Fig. 5 is simulation radial load load charger;
Fig. 6 is the eddy current displacement sensor mounting bracket;
Fig. 7 is the mounting structure sketch map that the thermal resistance test lead contacts with surface, the tested position of main shaft;
Fig. 8 is installed in the structural representation in the tested site tests of the main shaft hole for the thermal resistance test lead.
Among the figure: 1, main shaft, 2, the main shaft testing stand, 3, sensor stand, 3-1, vertical installed surface, 3-2, horizontal mounting surface, 4, magnetic support; 5, thermal resistance, 6, check rod, 7, the radial load load charger, 8, the torque load charger, 9, eddy current displacement sensor, 10, platen; 11, charger support, 11-1, vertical installed surface, 11-2, horizontal mounting surface, 12, feather key, 13, magnetic powder brake; 14, radial load adjustment bolt, 15, sideboard, 16, the pressure meter, 17, the radial load guide rod, 18, the radial load guide pin bushing; 19, radial load charger supporting mass, 20, rolling bearing, 21, bearing pin, 22, magnetosheath, 23, fixed cover.
The specific embodiment
For further understanding summary of the invention of the present invention, characteristics and effect, the following examples of giving an example now, and conjunction with figs. specifies as follows:
See also Fig. 1～Fig. 8; In order further to understand main shaft thermal characteristic and the hot error under the true processing operating mode in depth; The present invention provides the hot error test device of machine tool chief axis under a kind of simulated condition load-up condition, during test, can be installed on the main shaft testing stand 2 this device or on the platen 10.This device comprises simulated condition load main shaft charger and the hot error testing pilot system of main shaft two parts; Wherein, simulated condition load main shaft charger comprises simulation moment load charger 8 and simulation radial load load charger 7 two parts.
Above-mentioned simulation moment load charger comprises magnetic powder brake 13; Magnetic powder brake 13 is installed on the charger support 11; Be connected with check rod 6 through feather key 12; Check rod 6 is connected with main shaft 1, and magnetic powder brake 13 will be simulated torque load through feather key 12, check rod 6 and is applied on the main shaft 1; Through regulating the size of magnetic powder brake 13 exciting currents, can linear regulation simulate the size of torque load.
Above-mentioned simulation radial load load charger comprises pressure meter 16; Pressure meter 16 is installed in the radial load charger supporting mass 19; Pressure meter 16 is provided with and receives pull end and pressurized end, and the pull end that receives of pressure meter 16 is provided with radial load adjustment bolt 14, and the pressurized end of pressure meter 16 is provided with radial load guide rod 17; The other end of radial load guide rod 17 is equipped with rolling bearing 20 through bearing pin 21, and rolling bearing 20 rolls with check rod 6 and is connected.Evenly transmit for the radial load that makes radial load adjustment bolt 14 impose on pressure meter 16, between radial load adjustment bolt 14 and pressure meter 16, be provided with sideboard 15, sideboard 15 is slidingly connected on the radial load charger supporting mass 19.Through rotation radial load adjustment bolt 14, size that can linear regulation simulation radial load load.For reliable and stable transmission simulation radial load load, radial load guide rod 17 is contained in the radial load guide pin bushing 18, and radial load guide pin bushing 18 is fixed on the radial load charger supporting mass 19.
The hot error testing pilot system of main shaft comprises sensor installation subsystem and test data collection analysis subsystem.Wherein sensor installation subsystem comprises the thermal resistance 5 that is installed in main shaft 1 detected part and is installed in the eddy current displacement sensor 9 on the sensor stand 3.
Above-mentioned thermal resistance 5 is installed in the magnetic support 4; Magnetic support 4 comprises magnetosheath 22 and fixed cover 23; Magnetosheath 22 is packed in the bottom in the fixed cover 23, and the top in the fixed cover 23 is provided with screw thread, is used to connect thermal resistance 5; The test lead of thermal resistance 5 and the tested position of main shaft contact or are inlaid in the measured hole that the tested position of main shaft is provided with, and realize the temperature survey at the tested position of main shaft.Magnetic support 4 is adsorbed on the main shaft through the magnetic force of magnetosheath 22.Above-mentioned thermal resistance 5 is connected with data collecting system, and data collecting system is carried out analyzing and processing with transfer of data to computer.
Above-mentioned eddy current displacement sensor 9 is installed on the sensor stand 3; The installation site of 5 eddy current displacement sensors 9 is confirmed with reference to national standard " GB/T 17421.3-2009 lathe check general rule the 3rd part: fuel factor confirm "; Above-mentioned 5 eddy current displacement sensors 9 are connected with the displacement measurement appearance; The displacement measurement appearance is connected with data collecting system, and data collecting system is carried out analyzing and processing with transfer of data to computer.Hot error testing system under the hot error testing of above-mentioned main shaft system and the main shaft Light Condition is identical, is not described in detail in this.
The hot error testing pilot system of above-mentioned main shaft is through being installed in the eddy current displacement sensor 9 and the hot error of check rod 6 non-cpntact measurement main shafts on the sensor stand 3, and sensor stand 3 is provided with vertical installed surface 3-1 and horizontal mounting surface 3-2; Charger support 11 is provided with vertical installed surface 11-1 and horizontal mounting surface 11-2.Therefore, the present invention does not need other auxiliary mounting bracket, promptly applicable to simulation loading and hot error measure under the simulated condition load-up condition of vertical installation or horizontally-mounted machine tool chief axis; Through the horizontal mounting surface 3-2 of sensor stand and the horizontal mounting surface 11-2 of charger support are fixedly connected installation with platen 10 or main shaft testing stand 2, the present invention is applicable to hot error test under the simulated condition load-up condition of horizontal installation machine tool chief axis; Through the vertical installed surface 3-1 of sensor stand and the vertical installed surface 11-1 of charger support are fixedly connected installation with platen 10 or main shaft testing stand 2, the present invention is applicable to hot error test under the simulated condition load-up condition of vertical installation machine tool chief axis.
The hot error testing pilot system of main shaft is measured temperature through the thermal resistance that is installed in the main shaft detected part; Through being installed in eddy current displacement sensor and the hot error of check rod non-cpntact measurement main shaft on the sensor stand; The hot error testing pilot system of simulated condition load main shaft charger and main shaft is installed on platen or the main shaft testing stand simultaneously; Simulated condition load main shaft charger applies simulated condition load through contacting with check rod to main shaft, has realized that main shaft simulated condition load loads and the hot error measure of main shaft is carried out synchronously.
The present invention applying simulation torque load and radial load load to main shaft when, the hot error of the temperature at the tested position of synchro measure main shaft and three directions of main shaft; Through the comparative analysis of no-load test and load test, draw the hot error of simulated condition load-up condition lower main axis.Its main feature is to utilize magnetic powder brake simulation torque load, utilizes pressure meter simulation radial load, and simulation load is passed to axis system through the check rod that is installed on the main shaft; Adopt thermal resistance to measure main shaft detected part variations in temperature, adopt eddy current displacement sensor to measure spindle deformation; Can realize that main shaft simulated condition load loads and the hot error measure of main shaft is carried out synchronously.This device is applicable to the hot error test of the simulation loading of vertical installation and horizontally-mounted machine tool chief axis, for thermal characteristic and the hot error of research machine tool chief axis under operating loading provides a kind of practicable experimental rig.
Although combine accompanying drawing that the preferred embodiments of the present invention are described above; But the present invention is not limited to the above-mentioned specific embodiment, and the above-mentioned specific embodiment only is schematically, is not restrictive; Those of ordinary skill in the art is under enlightenment of the present invention; Not breaking away under the scope situation that aim of the present invention and claim protect, can also make a lot of forms, these all belong within protection scope of the present invention.
Claims (2)
1. the hot error test device of machine tool chief axis under the simulated condition load-up condition is characterized in that this experimental rig comprises simulated condition load main shaft charger and the hot error testing pilot system of main shaft; Said main shaft charger comprises torque load charger and radial load load charger; Said torque load charger comprises magnetic powder brake; Said magnetic powder brake is installed on the charger support; Said magnetic powder brake is connected with check rod through feather key; Said check rod is connected with said main shaft, and said magnetic powder brake will be simulated torque load through said feather key and said check rod and is applied on the said main shaft; Said radial load load charger comprises the pressure meter; Said pressure meter is installed on the radial load charger supporting mass; Said radial load charger supporting mass is fixedly connected with said charger support; Said pressure meter is provided with and receives pull end and pressurized end; The pull end that receives of said pressure meter is provided with radial load adjustment bolt, and said pressure meter pressurized end is provided with the radial load guide rod, and the pressure meter end far away of said radial load guide rod is equipped with rolling bearing; Said rolling bearing rolls with said check rod and is connected, and said radial load adjustment bolt will be simulated radial load load and be applied on the said main shaft through being pushed said pressure meter and produce simulation radial load load and contacting through said radial load guide rod, said rolling bearing and the rolling of said check rod; Said charger support is provided with vertical installed surface and horizontal mounting surface; The hot error testing pilot system of said main shaft is through being installed in eddy current displacement sensor and the hot error of the said main shaft of said check rod non-cpntact measurement on the sensor stand, and said sensor stand is provided with vertical installed surface and horizontal mounting surface; The hot error testing pilot system of said main shaft is measured temperature through the thermal resistance that is installed in said main shaft detected part; Said thermal resistance is installed in the detected part of said main shaft through magnetic support; Said magnetic support comprises fixed cover and magnetosheath; Said thermal resistance is threaded with said fixed cover, and said magnetic support is adsorbed on said main shaft surface through the magnetic force of said magnetosheath; The test lead of said thermal resistance contacts with surface, the tested position of main shaft, perhaps is inlaid in the measured hole of said main shaft tested position setting, and contacts with said measured hole bottom surface.
2. the hot error test device of machine tool chief axis is characterized in that under the simulated condition load-up condition according to claim 1, and said radial load guide rod is contained in the radial load guide pin bushing, and said radial load guide pin bushing is fixed on the said radial load charger supporting mass.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010102922890A CN101972948B (en) | 2010-09-26 | 2010-09-26 | Test device for thermal error of machine tool spindle under simulated work load condition |
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| CN2010102922890A CN101972948B (en) | 2010-09-26 | 2010-09-26 | Test device for thermal error of machine tool spindle under simulated work load condition |
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| CN101972948A CN101972948A (en) | 2011-02-16 |
| CN101972948B true CN101972948B (en) | 2012-07-04 |
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| CN103358180B (en) * | 2013-07-11 | 2015-06-03 | 浙江大学 | Method of quickly identifying thermal state characteristics of machine tool main shaft |
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| EP3108996B1 (en) * | 2015-06-23 | 2017-09-13 | Dr. Johannes Heidenhain GmbH | Device for measuring displacement of a rotating object |
| CN105500111A (en) * | 2015-12-25 | 2016-04-20 | 鼎奇(天津)主轴科技有限公司 | No-load friction moment test method and control system of machine tool main shaft |
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| CN106041641B (en) * | 2016-05-10 | 2018-01-19 | 天津大学 | Assess feed system leading screw prestretching force dynamic performance testing system and caliberating device |
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Application publication date: 20110216 Assignee: DINGQI (TIANJIN) SPINDLE TECHNOLOGY CO., LTD. Assignor: Tianjin University Contract record no.: 2014120000075 Denomination of invention: Test device for thermal error of machine tool spindle under simulated work load condition Granted publication date: 20120704 License type: Exclusive License Record date: 20140903 |
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