CN114264462A - Reliability test bench and method for double motorized spindle broaching mechanism - Google Patents
Reliability test bench and method for double motorized spindle broaching mechanism Download PDFInfo
- Publication number
- CN114264462A CN114264462A CN202111533012.7A CN202111533012A CN114264462A CN 114264462 A CN114264462 A CN 114264462A CN 202111533012 A CN202111533012 A CN 202111533012A CN 114264462 A CN114264462 A CN 114264462A
- Authority
- CN
- China
- Prior art keywords
- loading
- spindle
- electric
- broach
- cylinder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000007246 mechanism Effects 0.000 title claims abstract description 109
- 238000012360 testing method Methods 0.000 title claims abstract description 89
- 238000000034 method Methods 0.000 title claims description 12
- 238000011068 loading method Methods 0.000 claims abstract description 156
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 60
- 238000001514 detection method Methods 0.000 claims abstract description 35
- 229910052742 iron Inorganic materials 0.000 claims abstract description 28
- 238000006073 displacement reaction Methods 0.000 claims description 16
- 239000000919 ceramic Substances 0.000 claims description 14
- 238000004458 analytical method Methods 0.000 claims description 13
- 238000001512 dynamic force spectrum Methods 0.000 claims description 11
- 238000009826 distribution Methods 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 4
- 238000010998 test method Methods 0.000 claims description 4
- 238000013213 extrapolation Methods 0.000 claims description 3
- 238000012821 model calculation Methods 0.000 claims description 3
- 238000007781 pre-processing Methods 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 238000001228 spectrum Methods 0.000 claims description 3
- 230000007480 spreading Effects 0.000 claims description 3
- 238000003892 spreading Methods 0.000 claims description 3
- 238000007405 data analysis Methods 0.000 claims description 2
- 238000002474 experimental method Methods 0.000 claims description 2
- 230000009977 dual effect Effects 0.000 description 6
- 238000003466 welding Methods 0.000 description 4
- 238000011160 research Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000000418 atomic force spectrum Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000013519 translation Methods 0.000 description 1
Images
Landscapes
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The invention discloses a reliability test bed for a double-electric-spindle broach mechanism, which comprises: the device comprises a main shaft rotating unit, a moving device, a dynamic loading unit, a detection unit and a control console; the spindle rotating unit is provided with 2 sets, the 2 sets of spindle rotating units have the same structure, and the 2 sets of spindle rotating units are arranged oppositely and arranged on a ground flat iron together with the cylinder and the gas station; the spindle rotating unit includes: the device comprises a unclamping cylinder, an electric spindle, a tool shank loading mechanism and a spindle supporting seat; the unclamping cylinder 11 provides power for the loosening and engagement of the tool shank loading mechanism and the electric spindle; the tool shank loading mechanism is arranged on the main shaft rotating unit; the cutter handle loading mechanism and the dynamic loading unit are connected with the detection unit; the control console is respectively electrically connected with controlled equipment such as the main shaft rotating unit and the like; the reliability test can be simultaneously carried out on different electric spindle broach mechanisms, and simultaneously the test results can be compared, so that the dynamic loading force applied to the broach mechanisms in the actual working condition is obtained, and the difference among different broach mechanisms can be compared more visually.
Description
Technical Field
The invention belongs to the technical field of numerical control machine tool electric spindle tests, and particularly relates to a double electric spindle broach mechanism reliability test bed and a method.
Background
In recent years, with the rapid development of equipment manufacturing industry, China has become a big country for the production and application of numerical control machines, and the numerical control machines researched and developed in China at present make obvious progress in the aspects of precision, speed, large-scale and multi-axis linkage. However, with the increase of functions, the hidden trouble of failures is increased, advanced functions and performance indexes cannot be maintained, and the reliability problem is serious, which has become a focus of attention of enterprises, users and sales markets and a bottleneck of development of the numerical control machine industry. One of the main reasons for the low reliability level of the domestic numerical control machine tool is that the reliability level of the key functional parts of the domestic numerical control machine tool is low, so that the research and development of the reliability test device and the test technology of the key functional parts of the numerical control machine tool have important practical significance. The electric spindle is one of key functional components of a high-end numerically controlled lathe, the reliability level of the electric spindle has important influence on the reliability level of the whole machine, and the reliability research on a broach mechanism which is the component with the largest reliability influence in the electric spindle is particularly important.
The reliability test research of the electric main shaft broach mechanism in China is relatively late, and only a few reliability test devices with simple functions are available at present. For example, some test beds can simulate the operation of simply inserting and pulling the broach mechanism, but for the broach mechanism, the broach mechanism actually works not only including the insertion and pulling operation, but also the reliability of the broach mechanism is greatly affected by the high-frequency dynamic force of the electric spindle in the working process, and in addition, the broach mechanism in China does not have a perfect reliability test method (loading method and detection method) aiming at the broach mechanism at present, so that the reliability research on the broach mechanism is very important.
Disclosure of Invention
The invention aims to solve the problems and provides a reliability test bed and a method for a double-electric-spindle broach mechanism;
a reliability test bed for a double electric spindle broach mechanism comprises: the device comprises a main shaft rotating unit, a moving device 3, a dynamic loading unit 4, a detection unit 5, a cylinder 6, a gas station 7, a control console 8 and a ground iron 9;
the spindle rotating units are 2 sets, the 2 sets of spindle rotating units are identical in structure, and the 2 sets of spindle rotating units are arranged oppositely and arranged on the ground iron 9 together with the air cylinder 6 and the air station 7;
the spindle rotating unit includes: the device comprises a unclamping cylinder 11, an electric spindle 12, a tool shank loading mechanism 13 and a spindle supporting seat 14; 2 knife striking cylinders 11, an electric spindle 12 and a knife handle loading mechanism 13 are arranged; the unclamping cylinder 11 is connected with a tool shank loading mechanism 13 through an electric spindle 12; the unclamping cylinder 11 provides power for the loosening and engagement of the tool shank loading mechanism 13 and the electric spindle 12;
the tool shank loading mechanism 13 is arranged on the main shaft rotating unit; the gas station 7 is connected with the cylinder 6; the knife handle loading mechanism 13 and the dynamic loading unit 4 are connected with the detection unit 5; the console 8 is arranged beside the ground flat iron 9; the control console 8 is electrically connected with the main shaft rotating unit, the tool shank loading mechanism 13, the dynamic loading unit 4, the detection unit 5, the air cylinder 6 and the air station 7 respectively.
The knife handle loading mechanism 13 is a knife handle loading mechanism; handle of a knife loading mechanism 13 includes: the tool comprises a tool handle 131, a broach dynamometer 132, a dynamometer display 133, a tool handle loading shell 134, a No. 1 thrust bearing 135, a No. 2 ball roller bearing 136, a bearing mounting piece 137, a No. 3 thrust bearing 138 and an end cover 139, which are connected in sequence.
The mobile device 3 comprises: a slide plate 31, a guide rail 32, a slider 33, and a loading cylinder 34; the guide rail 32 is fixed on the ground flat iron 9; the number of the sliding plates 31 is 2, and the two sliding plates 31 are symmetrically arranged on the guide rail 32 through the sliding block 33; the loading cylinder 34 is arranged below the sliding plate and is parallel to the guide rail 32; the loading cylinder 34 is a double-piston cylinder, and both ends of the loading cylinder 34 are provided with piston rods 341; the front ends of the two piston rods 341 are connected to the bottoms of the two sliding plates 31, respectively.
The dynamic loading unit 4 comprises: a piezoelectric loading rod 41, a loading rod supporting seat 42 and a pretightening force adjusting device 43; the piezoelectric loading rod 41 and the pretightening force adjusting device 43 are arranged on the loading rod supporting seat 42; the loading lever support base 42 is provided on the slide plate 31.
The detection device 5 includes: a sensor support base 51 and a laser displacement sensor 52; the laser displacement sensor 52 and the sensor support base 51 are provided on the slide plate 31.
A reliability test method for a double-electric-spindle broach mechanism comprises the following steps: carrying out test, closing the experiment table and analyzing test data;
first, test was conducted
S1, inputting a program corresponding to a dynamic force spectrum to be loaded by a piezoelectric ceramic loading rod into a control console for standby, and compiling the loaded dynamic force spectrum:
1) actually measuring a dynamic force result;
2) selecting the minimum sample length;
3) signal analysis preprocessing;
4) time domain load spreading;
5) load spectrum extrapolation;
6) compiling a loading dynamic force spectrum;
and S2 engagement of the broach mechanism: the control console sends an instruction to the gas station to supply gas to the cylinders, the pneumatic loading part works to drive the two sets of sliding structures and the rotating device parts on the sliding structures to move towards the two electric main shafts on two sides, the knife striking cylinders work simultaneously, the main shafts are pulled to the mechanism to be loosened, the two knife handles are driven by the moving device to penetrate into the knife drawing mechanism, the knife striking cylinders stop supplying gas, and the knife drawing mechanism is meshed with the knife handles;
s3, rotating the electric spindle: the console sends an electric signal command, and the two electric spindles run according to the set rotating speed in the dynamic force spectrum;
s4, dynamic force loading: the console sends an instruction, and the loading framework loads according to the input load common program;
s5, canceling dynamic force: after the loading test is finished, the console sends an instruction to finish loading, and the piezoelectric ceramic loading rod stops working;
s6, rotation precision detection: the main shaft continues to rotate, and meanwhile, a laser displacement sensor of the detection equipment works to detect the precision of the rotating device;
s7, electric spindle stalling: the console sends an instruction, and the electric spindle stops rotating;
s8, broach force detection: recording the reading of a display meter of the dynamometer;
s9, pulling to force separation: the control console sends an instruction, controls the unclamping cylinder to supply air to separate the broach mechanism from the tool handle, and simultaneously, the air pressure loading part works to drive the two sets of sliding structures and the rotating device parts on the sliding structures to move towards the directions of the two electric main shafts far away from the two sides to a non-working position;
s10, repeating the test process from 1 to 9, and recording the broach force value and the rotation precision value obtained in each test so as to facilitate the analysis and use of the subsequent tests;
third, close the test bed
S1, after the test is finished, the console sends an instruction to enable the rotating parts of the two sets of devices to move to a non-working position;
s2, closing the electric spindle, the gas station and the piezoelectric ceramic loading rod;
s3, manually removing the base force of the piezoelectric ceramic loading rod;
4. closing the console software and closing the console;
fourth, analysis of Experimental data
And selecting a reliability model for test analysis, and performing data analysis.
The reliability model comprises: a wiener model, a gamma model and/or an inverse gaussian model;
the reliability model is a gamma model and comprises the following steps:
s1, supposing that test data accord with Weibull distribution;
s2, respectively bringing the acquired broach force value and the acquired rotation precision value into a model in an independent variable mode;
s3, self-defining a threshold value of each independent variable index;
and S4, obtaining a corresponding predicted life value or distribution condition through model calculation, and calculating a corresponding MTBF value.
The invention discloses a reliability test bed for a double-electric-spindle broach mechanism, which comprises: the device comprises a main shaft rotating unit, a moving device, a dynamic loading unit, a detection unit and a control console; the spindle rotating unit is provided with 2 sets, the 2 sets of spindle rotating units have the same structure, and the 2 sets of spindle rotating units are arranged oppositely and arranged on a ground flat iron together with the cylinder and the gas station; the spindle rotating unit includes: the device comprises a unclamping cylinder, an electric spindle, a tool shank loading mechanism and a spindle supporting seat; the unclamping cylinder 11 provides power for the loosening and engagement of the tool shank loading mechanism and the electric spindle; the tool shank loading mechanism is arranged on the main shaft rotating unit; the cutter handle loading mechanism and the dynamic loading unit are connected with the detection unit; the control console is respectively electrically connected with controlled equipment such as the main shaft rotating unit and the like; the reliability test can be simultaneously carried out on different electric spindle broach mechanisms, and simultaneously the test results can be compared, so that the dynamic loading force applied to the broach mechanisms in the actual working condition is obtained, and the difference among different broach mechanisms can be compared more visually.
Compared with the prior art, the invention has the beneficial effects that:
the reliability test bed for the double electric spindle broach mechanisms can simultaneously perform reliability tests on different electric spindle broach mechanisms, can obtain reliability test structures, can compare test results, and can more intuitively compare differences among different broach mechanisms.
2. The reliability test bed for the double-electric-spindle broach mechanism not only comprises the loosening and meshing actions of the pull-to mechanism, but also comprises the dynamic loading force which can be applied to the broach mechanism during actual working, so that the test effect of the test bed is more practical.
3. The reliability test bed for the double-electric-spindle broach mechanism, provided by the invention, simultaneously comprises a rotation precision detection mechanism and a broach force detection device, and provides data support for reliability tests.
4. The complete device of the reliability test bed for the double-electric-spindle broach mechanism adopts a set of air pressure system, and only one air station is used for completing the air pressure required by the complete test, so that the use space is saved, and the economic utilization rate is greatly improved.
Drawings
FIG. 1 is an overall schematic view of a reliability test bed for a dual electric spindle broach mechanism according to the present invention;
FIG. 2 is an exploded schematic view of a tool shank loading mechanism of the reliability test bed for a dual electric spindle broach mechanism according to the present invention;
FIG. 3 is a schematic diagram of a mobile device of a reliability test bed for a dual electric spindle broach mechanism according to the present invention;
FIG. 4 is a schematic view of a loading and axis locus detection part of a double electric spindle broach mechanism reliability test bed according to the present invention;
FIG. 5 is a flow chart of a method for testing the reliability of the dual electric spindle broach mechanism according to the present invention;
in the figure: the device comprises a unclamping cylinder 11, an electric spindle 12, a tool holder loading mechanism 13, a tool holder 131, a broach dynamometer 132, a dynamometer display meter 133, a tool holder loading shell 134, a thrust bearing number 1 135, a ball roller bearing number 2 136, a bearing mounting piece 137, a thrust bearing number 3 138, an end cover 139, a spindle support seat 14, a moving device 3, a sliding plate 31, a guide rail 32, a guide rail support plate 321, a sliding block 33, a loading cylinder 34, a piston rod 341, a piston rod connecting ring 342, a mounting connecting cover 343, a dynamic loading unit 4, a piezoelectric loading rod 41, a loading rod support seat 42, a pretightening force adjusting device 43, a detection unit 5, a sensor support seat 51, a laser displacement sensor 52, a cylinder 6, an air station 7, a control console 8 and a ground plane 9.
Detailed Description
Embodiment 1 reliability test bed for double electric spindle broach mechanism
Referring to fig. 1 to 4, a reliability test bed for a dual electric spindle broach mechanism includes: the device comprises a main shaft rotating unit, a moving device 3, a dynamic loading unit 4, a detection unit 5, a cylinder 6, a gas station 7, a control console 8 and a ground iron 9;
the spindle rotating unit is provided with 2 sets, and the 2 sets of spindle rotating units have the same structure and are oppositely arranged at two ends of the ground iron 9;
the spindle rotating unit includes: the device comprises a unclamping cylinder 11, an electric spindle 12, a tool shank loading mechanism 13 and a spindle supporting seat 14;
2 unclamping cylinders 11, the electric spindle 12 and the tool shank loading mechanism 13 are arranged; the unclamping cylinder 11 is connected with a tool shank loading mechanism 13 through an electric spindle 12; the unclamping cylinder 11 provides power for the loosening and engagement of the tool shank loading mechanism 13 and the electric spindle 12;
the control console 8 is respectively and electrically connected with the main shaft rotating unit, the tool shank loading mechanism 13, the loading unit, the detection unit 5, the air cylinder 6 and the air station 7;
the main shaft rotating unit, the air cylinder 6 and the air station 7 are arranged on a ground flat iron 9; the tool shank loading mechanism 13 is arranged on the main shaft rotating unit; the knife handle loading mechanism 13 and the loading unit are connected with the detection unit 5; the console 8 is arranged beside the ground flat iron 9;
the unclamping cylinder 11 is arranged on the electric spindle 12; the electric spindle 12 is arranged in the spindle supporting seat 14; the main shaft supporting seat 14 is fixed on the ground flat iron 9;
the unclamping cylinder 11 is fixedly connected to the electric spindle 5 through a bolt and used for pulling and inserting the tool shank; the main shaft support 13 is formed by welding a U-shaped iron block type structural part and a rectangular iron plate, a circular through hole is formed in the U-shaped iron block and used for assembling the electric main shaft 12, U-shaped openings are formed in four corners of a rectangular bottom plate and used for connecting bolts, and the main shaft support 14 is installed on the ground flat iron 9 through T-shaped bolts;
the knife handle loading mechanism 13 is a knife handle loading mechanism; handle of a knife loading mechanism 13 includes: the tool comprises a tool handle 131, a broach dynamometer 132, a dynamometer display 133, a tool handle loading shell 134, a No. 1 thrust bearing 135, a No. 2 ball roller bearing 136, a bearing mounting piece 137, a No. 3 thrust bearing 138 and an end cover 139, which are connected in sequence;
the tool holder 131 is arranged on the electric spindle 12, the electric spindle 12 rotates with the tool holder, and the tool holder 131 is switched between the plugging state and the unplugging state under the action of the tool striking bar 11; the broach dynamometer 132 is arranged on the handle, and a display meter of the broach dynamometer 132 displays numerical reading of a broach pulling force test;
in order to apply a radial force on the rotating tool shank 131, the transition is performed by a stationary tool shank loading shell, so that a radial force is applied to the tool shank during rotation; the tool shank loading shell is a box-shaped structural member and is formed by welding 5 steel plates and a cylinder, wherein the iron plate opposite to the arc is used as a bottom plate, through holes are formed in four corners of the bottom plate for connection, and the inner ring of the cylinder of the loading shell is in interference connection with the outer ring of the spherical roller bearing;
in order to transmit radial force, the tool handle 131 is connected with the bearing mounting piece 137 through a bolt, the bearing mounting piece is an annular component, the inner surface of the bearing mounting piece is in contact with the surface of the tool handle, the outer surface of the bearing mounting piece is provided with three shaft shoulders, the mounting positions of the three bearings relative to the tool handle are determined through the positioning of the shaft shoulders, the left end face of the No. 1 thrust bearing 135 is in contact with the tool handle loading shell 134, and the specific position of the internal structure relative to the tool handle loading shell 134 is determined;
the bearing inner ring is connected to the bearing mounting piece 137 through interference fit, so that the applied radial loading force is transmitted to the tool shank; the end cover 139 is in contact with the right end face of the thrust bearing to compress the thrust bearing, four through holes are formed in the outer side of the big circle of the end cover 139, and the end cover is finally installed on the knife handle loading shell 134 through bolts;
the moving device 3 is a moving device for changing the knife handle by the knife handle loading mechanism 13, and the moving device 3 moves in the horizontal direction to realize the switching of the insertion state of the knife handles;
the mobile device 3 comprises: a slide plate 31, a guide rail 32, a slider 33, and a loading cylinder 34;
the guide rail 32 is fixed on the ground flat iron 9 through a guide rail supporting plate 321; the number of the sliding plates 31 is 2, and each sliding plate 31 is provided with 4 sliding blocks 33; the two sliding plates 31 are symmetrically arranged on the guide rail 32 through the sliding block 33;
the loading cylinder 34 is a double-piston cylinder, and can realize bidirectional simultaneous telescopic motion; the loading cylinder 34 is arranged below the sliding plate and is parallel to the guide rail 32; a through hole is formed in the bottom plate of the loading cylinder 34, and the loading cylinder 34 is connected with the ground iron through a bolt; the piston rods 341 are arranged at both ends of the loading cylinder 34; the front ends of the two piston rods 341 are respectively connected with the bottoms of the two sliding plates 31;
the loading cylinder 34 is provided with three exchange air holes which are respectively positioned at the two sides and the middle of the cylinder body; when the middle air hole is communicated with high pressure and the two air holes are connected with low pressure, the double piston rods are pushed out simultaneously to complete the motion of installing the cutter; otherwise, the knife pulling movement is realized;
the piston rod 341 and the sealing ring are in close contact with the inner ring of the cylinder 6, and the cylinder is connected with three air holes on the piston rod through an upper two-position three-way valve, so that the high-low pressure conversion of the piston rod is realized; the reciprocating linear motion is realized along with the change of the air pressure connected with the three air holes of the loading air cylinder 34; the tail end of the piston rod 341 is provided with a shaft shoulder and a threaded hole, the shaft shoulder is used for installing and positioning the piston rod connecting ring 342, the threaded hole is used for installing the connecting cover 343, and the piston rod connecting ring 342 is compressed through threaded connection; the piston rod connecting ring 342 is a structural member formed by welding a U-shaped plate and an iron plate, a through hole is formed in the iron plate, and the through hole of the piston rod connecting ring 342 is connected with the sliding plate 31 through a bolt; therefore, the sliding plate 31 can move in a translation manner through the extending and retracting movement of the air cylinder, and the whole rotating mechanism is driven to move in the horizontal direction; the simultaneous loading test of the tool handles is realized by controlling the two sliding plates 31 through the air cylinder 6;
the dynamic loading unit 4 comprises: a piezoelectric loading rod 41, a loading rod supporting seat 42 and a pretightening force adjusting device 43;
the loading rod supporting seat 42 is mainly formed by welding an iron plate for being installed on the sliding plate 31 and a part for installing the piezoelectric loading rod through the iron plate, wherein the iron plate is provided with a through hole and can be connected to the sliding plate 31 through a T-shaped bolt; 2 bolt holes are respectively formed in the iron block used for mounting the piezoelectric loading rod in the horizontal direction and the vertical direction, and the loading direction and the fixation of the piezoelectric loading rod 41 are ensured through adjusting bolts;
the piezoelectric loading rod 41 changes the input current through the console to change the loading frequency of the piezoelectric loading rod 41; a threaded hole is formed in the tail end of the piezoelectric loading rod 41 and used for installing a pretightening force adjusting device 43;
the whole loading device firstly ensures the general position of the device by adjusting the position of the supporting seat, then controls the magnitude of constant loading force by rotationally adjusting the pre-tightening force loading structure, and finally controls the piezoelectric ceramic loading rod to finally realize the radial dynamic force loading of the cutter handle structure in work and feed back the numerical value of the dynamic force to an upper computer;
the detection unit 5 is used for detecting the axle center track by the laser displacement sensor;
the detection device 5 includes: a sensor support base 51 and a laser displacement sensor 52; laser displacement sensor 52 is fixed on sensor supporting seat 51 through the bolt, through the position of adjusting sensor supporting seat 51, guarantees that laser displacement sensor 52 can detect the axle center orbit error of handle of a knife. Through bolt connection, the sensor supporting seat 51 and the loading rod supporting seat 42 are jointly fixed on the sliding plate 31, so that the relative rest of the loading device, the testing device and the detecting device is realized; and the laser displacement sensor directly transmits the measured data to an upper computer for processing.
Embodiment 2 reliability test method for double-electric-spindle broaching mechanism
Referring to fig. 1 to 5, a method for testing reliability of a dual electric spindle broach mechanism includes: preparing work before the test, carrying out the test, closing a test bench and analyzing test data;
preparation before test
1. Air pressure detection: and detecting whether the pressure intensity of the air pressure station belongs to a normal working interval or not, and detecting whether the pressure intensity of the air pressure cylinder is normal or not.
2. Debugging the detection equipment: and starting the laser displacement sensor, and adjusting the distance between the laser displacement sensor and a polished rod provided with the broach force detector and used for detecting the precision, so that the laser displacement sensor is positioned in a working interval. And debugging the broach force detector to ensure that the broach force detector is normal, and the display result is 0N when no broach is pulled.
3. And (3) locking detection of a test bed: whether all working parts of the test bed are locked or not is strictly detected, so that testers are prevented from being accidentally injured after the test is started, the base force of the piezoelectric ceramic loading rod is adjusted in advance according to the dynamic force base value loaded as required.
4. Preparing an environment: the device mainly ensures that no sundries are near the test bed, the test temperature is the temperature of the working interval of the detection equipment, and the detection device part has no sunlight interference when the test bed works.
Second, test was conducted
1. Inputting a program corresponding to a dynamic force spectrum needing to be loaded by a piezoelectric ceramic loading rod into a console for standby, wherein the programming flow of the loaded dynamic force spectrum comprises the following steps:
1) measured dynamic force results
2) Minimum sample length selection
3) Signal analysis preprocessing
4) Time domain load spreading
5) Load spectrum extrapolation
6) Compiling a loaded dynamic force profile
2. And (3) meshing of a broach mechanism: the control console sends an instruction to the gas station to supply gas to the cylinders, the pneumatic loading part works to drive the two sets of sliding structures and the rotating device parts on the sliding structures to move towards the two electric main shafts on the two sides, the knife striking cylinders work simultaneously, the main shafts are pulled to the mechanism to be loosened, the two knife handles are driven by the moving device to penetrate into the broach mechanism, the rear knife striking cylinders stop supplying gas, and the broach mechanism is meshed with the knife handles.
3. Rotation of the electric spindle: the console sends an electric signal command, and the two electric spindles run according to the set rotating speed in the dynamic force spectrum.
4. Loading dynamic force: and the console sends an instruction, and the loading framework loads according to the input load common program.
5. And (3) cancelling dynamic force: and after the loading test is finished, the console sends an instruction to finish loading, and the piezoelectric ceramic loading rod stops working.
6. Detecting the rotation precision: the main shaft continues to rotate, and meanwhile, a laser displacement sensor of the detection equipment works to detect the precision of the rotating device.
7. Stopping the electric spindle: the console sends a command, and the electric spindle stops rotating.
8. And (3) broach force detection: the reading of the dynamometer display is recorded.
9. Pulling to force separation: the control console sends an instruction to control the unclamping cylinder to supply air to separate the broach mechanism from the tool handle, and meanwhile, the air pressure loading part works to drive the two sets of sliding structures and the rotating device parts on the sliding structures to move towards the direction of the two electric main shafts far away from the two sides to the non-working position.
10. And repeating the test process from 1 to 9, and recording the broach force value and the rotation precision value obtained in each test so as to facilitate the analysis and use of the subsequent test. The number of repetitions may be determined by the experimenter at a particular time.
Third, close the test bed
1, after the test is finished, the console sends an instruction to enable the rotating parts of the two sets of devices to move to the non-working position.
And 2, closing the electric spindle, the gas station and the piezoelectric ceramic loading rod.
And 3, manually removing the base force of the piezoelectric ceramic loading rod.
And 4, closing the console software and closing the console.
Fourth, analysis of Experimental data
1, selecting a reliability model for experimental analysis, and selecting a wiener model, a gamma model and an inverse Gaussian model to be used for a plurality of reliability analysis models. Here, the gamma model is taken as an example.
2 the experimental data are assumed to fit a weibull distribution.
And 3, respectively bringing the acquired broach force value and the acquired rotation precision value into the model in an independent variable mode.
And 4, customizing a threshold value of each independent variable index.
And 5, obtaining a corresponding predicted life value or distribution condition through model calculation, and calculating a corresponding MTBF value.
6, reliability description and evaluation are carried out on the test object, namely the two sets of broaching mechanisms.
The embodiment of the invention is to facilitate the technical personnel in the technical field to understand and apply the invention, the invention is only an optimized embodiment, or a better specific technical scheme, and the invention is only suitable for the reliability tests of the double electric spindle broach mechanisms with different types and sizes in a certain range, the reliability tests of the double electric spindle broach mechanisms with different sizes outside the range, and the basic technical scheme is not changed, but the specification and the model of the used parts are changed accordingly, such as the selection of standard parts such as a tool holder, a tension meter and the like, so the invention is not limited to the implementation of the description of the specific technical scheme. If the related technical personnel make equivalent structural changes or various modifications without creative efforts while adhering to the basic technical solution of the present invention, the protection scope of the present invention is covered.
Claims (8)
1. The utility model provides a two electric main shaft broach mechanism reliability test platform which characterized in that, it includes: the device comprises a main shaft rotating unit, a moving device (3), a dynamic loading unit (4), a detection unit (5), a cylinder (6), a gas station (7), a console (8) and a ground iron (9);
the two sets of spindle rotating units are arranged, have the same structure and are arranged oppositely, and are arranged on the ground iron (9) together with the air cylinder (6) and the air station (7);
the spindle rotating unit includes: the device comprises a unclamping cylinder (11), an electric spindle (12), a knife handle loading mechanism (13) and a spindle supporting seat (14); 2 knife striking cylinders (11), an electric spindle (12) and a knife handle loading mechanism (13) are arranged; the unclamping cylinder (11) is connected with a tool shank loading mechanism (13) through an electric spindle (12); the unclamping cylinder (11) provides power for the loosening and the engagement of the tool shank loading mechanism (13) and the electric spindle (12);
the tool shank loading mechanism (13) is arranged on the main shaft rotating unit; the gas station (7) is connected with the cylinder (6); the knife handle loading mechanism (13) and the dynamic loading unit (4) are connected with the detection unit (5); the console (8) is arranged beside the ground flat iron (9); the control console (8) is respectively and electrically connected with the main shaft rotating unit, the knife handle loading mechanism (13), the dynamic loading unit (4), the detection unit (5), the air cylinder (6) and the air station (7).
2. The reliability test bed for the double-electric-spindle broach mechanism according to claim 1, characterized in that: the knife handle loading mechanism (13) is a knife handle loading mechanism; the handle loading mechanism (13) comprises: the tool comprises a tool shank (131), a broach dynamometer (132), a dynamometer display meter (133), a tool shank loading shell (134), a No. 1 thrust bearing (135), a No. 2 ball roller bearing (136), a bearing mounting piece (137), a No. 3 thrust bearing (138) and an end cover 139, which are connected in sequence.
3. The reliability test bed for the double-electric-spindle broach mechanism according to claim 2, characterized in that: the mobile device (3) comprises: the device comprises a sliding plate (31), a guide rail (32), a sliding block (33) and a loading cylinder (34); the guide rail (32) is fixed on the ground flat iron (9); 2 sliding plates (31) are arranged, and the two sliding plates (31) are symmetrically arranged on the guide rail (32) through a sliding block (33); the loading cylinder (34) is arranged below the sliding plate and is parallel to the guide rail (32); the loading cylinder (34) is a double-piston cylinder, and both ends of the loading cylinder (34) are provided with piston rods (341); the front ends of the two piston rods (341) are respectively connected with the bottoms of the two sliding plates (31).
4. The reliability test bed for the double-electric-spindle broach mechanism according to claim 3, characterized in that: the dynamic loading unit (4) comprises: the piezoelectric loading device comprises a piezoelectric loading rod (41), a loading rod supporting seat (42) and a pretightening force adjusting device (43); the piezoelectric loading rod (41) and the pretightening force adjusting device (43) are arranged on the loading rod supporting seat (42); the loading rod supporting seat (42) is arranged on the sliding plate (31).
5. The reliability test bed for the double-electric-spindle broach mechanism according to claim 4, characterized in that: the detection device (5) comprises: a sensor support base (51) and a laser displacement sensor (52); the laser displacement sensor (52) and the sensor support seat (51) are arranged on the sliding plate (31).
6. A reliability test method for a double-electric-spindle broach mechanism comprises the following steps: carrying out test, closing the experiment table and analyzing test data;
first, test was conducted
S1, inputting a program corresponding to a dynamic force spectrum to be loaded by a piezoelectric ceramic loading rod into a control console for standby, and compiling the loaded dynamic force spectrum:
1) actually measuring a dynamic force result;
2) selecting the minimum sample length;
3) signal analysis preprocessing;
4) time domain load spreading;
5) load spectrum extrapolation;
6) compiling a loading dynamic force spectrum;
and S2 engagement of the broach mechanism: the control console sends an instruction to the gas station to supply gas to the cylinders, the pneumatic loading part works to drive the two sets of sliding structures and the rotating device parts on the sliding structures to move towards the two electric main shafts on two sides, the knife striking cylinders work simultaneously, the main shafts are pulled to the mechanism to be loosened, the two knife handles are driven by the moving device to penetrate into the knife drawing mechanism, the knife striking cylinders stop supplying gas, and the knife drawing mechanism is meshed with the knife handles;
s3, rotating the electric spindle: the console sends an electric signal command, and the two electric spindles run according to the set rotating speed in the dynamic force spectrum;
s4, dynamic force loading: the console sends an instruction, and the loading framework loads according to the input load common program;
s5, canceling dynamic force: after the loading test is finished, the console sends an instruction to finish loading, and the piezoelectric ceramic loading rod stops working;
s6, rotation precision detection: the main shaft continues to rotate, and meanwhile, a laser displacement sensor of the detection equipment works to detect the precision of the rotating device;
s7, electric spindle stalling: the console sends an instruction, and the electric spindle stops rotating;
s8, broach force detection: recording the reading of a display meter of the dynamometer;
s9, pulling to force separation: the control console sends an instruction, controls the unclamping cylinder to supply air to separate the broach mechanism from the tool handle, and simultaneously, the air pressure loading part works to drive the two sets of sliding structures and the rotating device parts on the sliding structures to move towards the directions of the two electric main shafts far away from the two sides to a non-working position;
s10, repeating the test process from 1 to 9, and recording the broach force value and the rotation precision value obtained in each test so as to facilitate the analysis and use of the subsequent tests;
third, close the test bed
S1, after the test is finished, the console sends an instruction to enable the rotating parts of the two sets of devices to move to a non-working position;
s2, closing the electric spindle, the gas station and the piezoelectric ceramic loading rod;
s3, manually removing the base force of the piezoelectric ceramic loading rod;
4. closing the console software and closing the console;
fourth, analysis of Experimental data
And selecting a reliability model for test analysis, and performing data analysis.
7. The method for testing the reliability of the double-electric-spindle broach mechanism according to claim 6, characterized in that: the reliability model comprises: wiener model, gamma model, and/or inverse gaussian model.
8. The method for testing the reliability of the double-electric-spindle broach mechanism according to claim 6, characterized in that: the reliability model is a gamma model;
s1, supposing that test data accord with Weibull distribution;
s2, respectively bringing the acquired broach force value and the acquired rotation precision value into a model in an independent variable mode;
s3, self-defining a threshold value of each independent variable index;
and S4, obtaining a corresponding predicted life value or distribution condition through model calculation, and calculating a corresponding MTBF value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111533012.7A CN114264462B (en) | 2021-12-15 | 2021-12-15 | Reliability test bed and method for double-motorized spindle broach mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111533012.7A CN114264462B (en) | 2021-12-15 | 2021-12-15 | Reliability test bed and method for double-motorized spindle broach mechanism |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114264462A true CN114264462A (en) | 2022-04-01 |
| CN114264462B CN114264462B (en) | 2024-03-22 |
Family
ID=80827251
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111533012.7A Active CN114264462B (en) | 2021-12-15 | 2021-12-15 | Reliability test bed and method for double-motorized spindle broach mechanism |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114264462B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115046750A (en) * | 2022-06-16 | 2022-09-13 | 深圳市创世纪机械有限公司 | Tool changing life experimental device and method for main shaft |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4777715A (en) * | 1986-10-31 | 1988-10-18 | Roberts William C | Tool shank retention mechanism with machine tool therefor |
| DE4315537A1 (en) * | 1992-05-12 | 1993-11-18 | Morbidelli Spa | Tool changing device for wood processing machine - has grippers on end of electro spindle to hold tools which are taken from seats on tool magazine |
| CN104551027A (en) * | 2015-02-06 | 2015-04-29 | 东莞市科隆电机有限公司 | Built-in electric main shaft for high-speed milling and drilling |
| CN205374030U (en) * | 2016-02-05 | 2016-07-06 | 吉林大学 | Guide tracked power loading device of electricity main shaft reliability test platform arc |
| CN106768994A (en) * | 2017-03-20 | 2017-05-31 | 吉林大学 | A kind of electro spindle reliability test of multiple physical field Combined Loading |
| CN106908237A (en) * | 2017-04-20 | 2017-06-30 | 吉林大学 | Machine tool spindle broach mechanism reliability test |
| CN109724801A (en) * | 2019-01-08 | 2019-05-07 | 洛阳轴承研究所有限公司 | A kind of device that can carry out axially loaded detection to multipair bearing simultaneously |
| BR102017027591A2 (en) * | 2017-12-20 | 2019-07-09 | Universidade Estadual De Campinas - Unicamp | BEARING AND SLIDING CONTACT WEAR ANALYSIS MACHINE |
| CN110631817A (en) * | 2019-10-11 | 2019-12-31 | 吉林大学 | A replaceable broach mechanism reliability test device and test method |
| CN112414692A (en) * | 2020-11-30 | 2021-02-26 | 吉林大学 | High-frequency simulation loading double-servo power tool rest reliability test method |
| CN112504653A (en) * | 2020-12-05 | 2021-03-16 | 吉林大学 | Reliability test method for multi-working-condition simulation loading servo power tool rest |
-
2021
- 2021-12-15 CN CN202111533012.7A patent/CN114264462B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4777715A (en) * | 1986-10-31 | 1988-10-18 | Roberts William C | Tool shank retention mechanism with machine tool therefor |
| DE4315537A1 (en) * | 1992-05-12 | 1993-11-18 | Morbidelli Spa | Tool changing device for wood processing machine - has grippers on end of electro spindle to hold tools which are taken from seats on tool magazine |
| CN104551027A (en) * | 2015-02-06 | 2015-04-29 | 东莞市科隆电机有限公司 | Built-in electric main shaft for high-speed milling and drilling |
| CN205374030U (en) * | 2016-02-05 | 2016-07-06 | 吉林大学 | Guide tracked power loading device of electricity main shaft reliability test platform arc |
| CN106768994A (en) * | 2017-03-20 | 2017-05-31 | 吉林大学 | A kind of electro spindle reliability test of multiple physical field Combined Loading |
| CN106908237A (en) * | 2017-04-20 | 2017-06-30 | 吉林大学 | Machine tool spindle broach mechanism reliability test |
| BR102017027591A2 (en) * | 2017-12-20 | 2019-07-09 | Universidade Estadual De Campinas - Unicamp | BEARING AND SLIDING CONTACT WEAR ANALYSIS MACHINE |
| CN109724801A (en) * | 2019-01-08 | 2019-05-07 | 洛阳轴承研究所有限公司 | A kind of device that can carry out axially loaded detection to multipair bearing simultaneously |
| CN110631817A (en) * | 2019-10-11 | 2019-12-31 | 吉林大学 | A replaceable broach mechanism reliability test device and test method |
| CN112414692A (en) * | 2020-11-30 | 2021-02-26 | 吉林大学 | High-frequency simulation loading double-servo power tool rest reliability test method |
| CN112504653A (en) * | 2020-12-05 | 2021-03-16 | 吉林大学 | Reliability test method for multi-working-condition simulation loading servo power tool rest |
Non-Patent Citations (5)
| Title |
|---|
| E. ABELE， Y. ALTINTAS, C. BRECHER: "Machine tool spindle units", MACHINE TOOL SPINDLE UNITS, vol. 59, no. 2, pages 781 - 802 * |
| SUJIT HENSH， V.K. TEWARI， GANESH UPADHYAY: "An instrumentation system to measure the loads acting on the tractor PTO bearing during rotary tillage", JOURNAL OF TERRAMECHANICS, vol. 96, pages 1 - 10 * |
| 呼烨，杨兆军，宋靖安，朱岩，王凯，方杰，侯雨辰: "基于电力测功和压电陶瓷加载系统的 高速电主轴可靠性试验台设计", 科技导报, vol. 30, no. 1, pages 34 - 38 * |
| 张亚军;轧刚;: "大型拼接件拉孔工艺装备的设计与开发", 机械管理开发, no. 02, 15 April 2009 (2009-04-15), pages 72 - 73 * |
| 白丰瑞: "电主轴回转精度退化研究及保持性评估", 中国优秀硕士学位论文全文数据库 (工程科技Ⅰ辑), no. 8, pages 022 - 312 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115046750A (en) * | 2022-06-16 | 2022-09-13 | 深圳市创世纪机械有限公司 | Tool changing life experimental device and method for main shaft |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114264462B (en) | 2024-03-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105067234B (en) | High-speed electric main shaft synthesis experiment platform and experimental method | |
| CN106514433B (en) | A kind of magazine reliability test method and condition monitoring system | |
| CN101750006B (en) | Error detection device for hourglass worm | |
| CN105547685B (en) | High-speed electric main shaft loads and tool changing experimental rig | |
| CN102507228B (en) | Disc tool magazine reliability testing device and method | |
| CN103273379A (en) | Method for detecting linkage accuracy of C-shaft of multi-shaft linkage double-pendulum numerical control milling machine | |
| CN104535355B (en) | Heavy type numerical control plane milling and boring machine table feed system reliability test bench | |
| CN114264462B (en) | Reliability test bed and method for double-motorized spindle broach mechanism | |
| CN107588743B (en) | Device for detecting end face angle of automobile rear torsion Liang Lunzhou plate | |
| CN110701984A (en) | A comprehensive detection system for the structural strength of a destructive camshaft and its use method | |
| CN112146800B (en) | Measuring device, measuring system and measuring method for robot loading force | |
| CN112945541A (en) | Special device for airplane undercarriage turning endurance test and detection method | |
| CN111649931B (en) | Double-combined loading power servo tool rest power head reliability test bed and test method | |
| CN112414692A (en) | High-frequency simulation loading double-servo power tool rest reliability test method | |
| CN110936227A (en) | Special static characteristic detection device and measurement method for numerical control swing angle milling head | |
| CN215727430U (en) | High-frequency dynamic and static stiffness composite loading test system | |
| CN105115743A (en) | Numerical control external cylindrical grinding machine reliability test comprehensive loading device | |
| CN110455521B (en) | Processing center main shaft blind rivet and disc spring reliability test device | |
| CN206351386U (en) | A kind of magazine condition monitoring system | |
| CN220568396U (en) | A sliding swing test bench with spherical bearings | |
| CN202974656U (en) | Rolling linear rail pair reliability test device | |
| CN108582038B (en) | Non-contact force loading device for simulating three-axis numerical control machine tool machining | |
| CN214667597U (en) | Special device for airplane undercarriage turning endurance test | |
| CN216483867U (en) | A reliability test device for CNC machine tool chuck | |
| Guo et al. | A modified method for measuring geometric errors of rotary axes based on sensitivity analysis and error simulation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |