CN104198204A - Straight feed unit comprehensive performance degradation testbed capable of simulating actual working conditions - Google Patents

Straight feed unit comprehensive performance degradation testbed capable of simulating actual working conditions Download PDF

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Publication number
CN104198204A
CN104198204A CN201410438959.3A CN201410438959A CN104198204A CN 104198204 A CN104198204 A CN 104198204A CN 201410438959 A CN201410438959 A CN 201410438959A CN 104198204 A CN104198204 A CN 104198204A
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worktable
cylinder
loading
ball screw
cylinders
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CN201410438959.3A
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CN104198204B (en
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张巍
王民
孔德顺
高相胜
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Beijing University of Technology
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Beijing University of Technology
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Abstract

The invention discloses a straight feed unit comprehensive performance degradation testbed capable of simulating actual working conditions. The testbed is used for studying the influence of the accuracy degradation and the rigidity degradation of a ball screw pair and a linear guide rail pair on the comprehensive performance degradation of a worktable. Cylinders in three directions are used for loading on the worktable, respectively, and therefore, the actual movement process of the worktable of a machine can be simulated. Besides, the working conditions of the experimental device are closer to the actual working conditions. A torque sensor is connected between a lead screw and a servo motor. A three-direction force sensor is mounted between a lead screw nut and the worktable and capable of measuring the frictional force of the linear guide rail pair. A round grating scale is mounted inside a servo motor; pneumatic control is matched with the control of the servo motor so that the loading abrasion operation of the testbed can be realized; an accelerated degradation manner is adopted in the test process, and meanwhile, the influence of a plurality of factors on the performance of the worktable is taken into account.

Description

The linear feed unit combination property degradation experiment platform of simulation actual condition
Technical field
The present invention relates to a kind of linear feed unit combination property degradation experiment platform of simulating actual condition, belong to numerically-controlled machine manufacture and detection technique field.
Background technology
Patent of the present invention proposes to utilize cylinder to carry out three directions to linear feed unit and loads and use accelerated degradation test principle design degradation experiment platform, and in kinematic pair junction, multiple sensors is set, for detection of various supplemental characteristics.Research ball screw assembly, and the impact of rectilinear motion pair on worktable combination property.Ball screw assembly, and line slideway auxiliary are the main moving-members of NC machine tool feed system, and its precision has determined the precision of numerically controlled machine.Under actual condition, in order to improve the rigidity of ball screw assembly, and line slideway auxiliary, the normal method that adopts the pretightning force that increases ball screw assembly, and line slideway auxiliary improves rigidity.Feed unit used after a period of time, with ball screw assembly, and line slideway auxiliary operation repeatedly, the rubbing wear meeting of rolling body and raceway causes pretightning force to be lost, the pretightning force of kinematic pair declines, kinematic pair produces morpheme error, cause linear feed unit precise decreasing, how to learn accurately that the mechanism of precise decreasing becomes a difficult problem.The transmission accuracy of ball screw assembly, and line slideway auxiliary is relevant with several factors, for example moment of friction, pretightning force, load mode, mode of motion, contact angle etc.A lot of research has been done to ball screw assembly, and line slideway auxiliary by domestic ball screw assembly, and line slideway auxiliary manufacturing enterprise and correlative study unit, but still can not accurate description worktable and guide rail between the degenerative process of combination property.Consider that the many factors such as pretightning force and moment of friction degenerate and study and carry out also rare research of modeling worktable combination property.
Summary of the invention
The present invention relates to a kind of linear feed unit combination property degradation experiment platform of simulating actual condition, the impact of degenerating on worktable combination property for studying the precision of ball-screw and line slideway.
The technical solution adopted in the present invention is a kind of linear feed unit combination property degradation experiment platform of simulating actual condition, and this test bench comprises that testing table base 1, leading screw servomotor 2, connection bearing 3, straight-line rolling guide set 4, ball screw assembly, 5, worktable 6, axial cylinder loading blocks 7, two cylinder piston 8, vertical cylinder load roller 9, portal frame 10, vertical cylinder 11, axially pair cylinders 12, side direction add carrier gas cylinder 13, side direction cylinder loads roller 14, torque sensor 15, linear grating chi 16, three direction power sensors 17; This test bench adopts three direction cylinder load modes, the duty of Reality simulation milling machine.
Leading screw servomotor 2 connects by being connected bearing 3 with ball screw assembly, 5, and be provided with torque sensor 15 in the junction that connects bearing 3 and ball screw assembly, 5, leading screw servomotor 2 is connected with ball screw assembly, 5 by shaft coupling and drives worktable 6 to carry out reciprocating action; Straight-line rolling guide set 4 is fixed on testing table base 1; Portal frame 10 is fixedly mounted on testing table base 1 both sides; Axial cylinder loading blocks 7 is fixed on worktable 6 axial locations; Between worktable 6 and testing table base 1, linear grating chi 16 is installed, the moving chi of linear grating chi 16 is arranged on worktable 6 bottoms, and the scale of linear grating chi 16 is arranged on straight-line rolling guide set 4 sides, parallel with straight-line rolling guide set 4.
Vertical loading cylinder 11 is arranged on portal frame 10 tops, and vertical loading cylinder 11 loads roller 9 by vertical cylinder worktable 6 is carried out to vertical direction loading, and vertical cylinder loads between roller 9 and worktable 6 and contacts for rolling.
Side direction adds carrier gas cylinder 13 and is arranged on portal frame 10 sides, and side direction adds carrier gas cylinder 13, by side direction cylinder loading roller 14, worktable 6 carried out to side direction loading, and side direction cylinder loads between roller 14 and worktable 6 and contacts for rolling.
Axially two cylinders 12 are arranged on portal frame 10, and the two cylinder pistons 8 on axially two cylinders 12 are parallel with ball screw assembly, 5, and two cylinder pistons 8 can contact with axial cylinder loading blocks 7, and worktable 6 is axially loaded; Between axial cylinder piston 8 and axial cylinder loading blocks 7, be provided with buffer rubber gasket.
Compared with prior art, beneficial effect of the present invention is as follows.
1) testing table of the present invention adopts cylinder to carry out three directions loadings to worktable, has realized simulated machine tool worktable actual motion process.Experimental provision more approaches actual condition.Consider the wear error of ball screw assembly, and line slideway auxiliary, pretightning force and moment of friction are considered in the middle of modeling the impact of precision degeneration, and adopted heavily loaded accelerated degradation test.
2) testing table of the present invention adopts large stream surplus valve auxiliary tone pressure valve to realize high loading force, and control cylinder has coordinated load test with servomotor.
3) testing table of the present invention arranges multiple sensors to detect the parameter needing between driving-chain.The factor of considering precision degeneration is more than ever before.Adopt Real-Time Monitoring mode to measure worktable.Servomotor and pneumatically loading can be realized one way and load, back and forth load, and the various ways such as one direction loading and multi-direction loading are simulated operating mode.
Brief description of the drawings
Fig. 1 is the general structure schematic diagram of apparatus of the present invention.
Fig. 2 is apparatus of the present invention left view.
Fig. 3 is apparatus of the present invention vertical view.
In figure: 1, testing table base, 2, leading screw servomotor, 3, connect bearing, 4, straight-line rolling guide set, 5, ball screw assembly,, 6, worktable, 7, axial cylinder loading blocks, 8, two cylinder piston, 9, vertical cylinder loads roller, 10, portal frame, 11, vertical cylinder, 12, axially two cylinders, 13, side direction adds carrier gas cylinder, and 14, side direction cylinder loads roller, 15, torque sensor, 16, linear grating chi, 17, three direction power sensors.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.
As Figure 1-3, a kind of linear feed unit combination property degradation experiment platform of simulating actual condition, this test bench comprises, testing table base 1, leading screw servomotor 2, connects bearing 3, straight-line rolling guide set 4, ball screw assembly, 5, worktable 6, axial cylinder loading blocks 7, two cylinder piston 8, vertical cylinder and loads that roller 9, portal frame 10, vertical cylinder 11, axially two cylinders 12, side direction add carrier gas cylinder 13, side direction cylinder loads roller 14, torque sensor 15, linear grating chi 16, three direction power sensors 17; This test bench adopts three direction cylinder load modes, the duty of Reality simulation milling machine.
Leading screw servomotor 2 connects by being connected bearing 3 with ball screw assembly, 5, and be provided with torque sensor 15 in the junction that connects bearing 3 and ball screw assembly, 5, leading screw servomotor 2 is connected with ball screw assembly, 5 by shaft coupling and drives worktable 6 to carry out reciprocating action; Straight-line rolling guide set 4 is fixed on testing table base 1; Portal frame 10 is fixedly mounted on testing table base 1 both sides; Axial cylinder loading blocks 7 is fixed on worktable 6 axial locations; Between worktable 6 and straight-line rolling guide set 4, linear grating chi 16 is installed, the moving chi of linear grating chi 16 is arranged on worktable 6 bottoms, and the scale of linear grating chi 16 is arranged on straight-line rolling guide set 4 sides, parallel with straight-line rolling guide set 4.
Vertical loading cylinder 11 is arranged on portal frame 10 tops, and vertical loading cylinder 11 loads roller 9 by vertical cylinder worktable 6 is carried out to vertical direction loading, and vertical cylinder loads between roller 9 and worktable 6 and contacts for rolling.
Side direction adds carrier gas cylinder 13 and is arranged on portal frame 10 sidepieces, and side direction adds carrier gas cylinder 13, by side direction cylinder loading roller 14, worktable 6 carried out to side direction loading, and side direction adds carrier gas cylinder and loads between roller 14 and worktable 6 as rolling contacts.
Axially two cylinders 12 are arranged on portal frame 10, axially add two cylinder pistons 8 on two cylinders 12 parallel with ball screw assembly, 5, and two cylinder pistons 8 can contact with axial cylinder loading blocks 7, and worktable 6 is axially loaded; Between axial cylinder piston 8 and axial cylinder loading blocks 7, be provided with buffer rubber gasket.
Worktable adopts three directions to load to simulate feed unit actual condition.Loading force is higher than actual condition load, consider two kinds of way of degeneration, the first, adopt at the uniform velocity top load way of degeneration to carry out precision degeneration experiment, the second, adopt worktable acceleration and deceleration operation to carry out precision degeneration experiment, the data that obtain by sensor in accelerated degradation test are set up accuracy prediction model, prediction work platform combination property degradation mechanism.
The cylinder of three directions all adopts constant voltage output, and output pressure is adjustable by pressure regulator valve.In order to obtain larger loading force, axial cylinder adopts two cylinders, and total loop and a point loop are equipped with throttling valve retaining valve in parallel, and being convenient to adjust two cylinders is synchronous operation.
The data that this testing table is measured comprise: worktable 6 total load moments of torsion, record by torque sensor 15.Moment of friction between ball screw assembly, 5 and worktable 6, by double nut, mechanism measures.Worktable 6 straight-line displacements, record by linear grating chi 16.Grating scale adopts absolute encoding or relative type motor coding.The angular displacement of leading screw servomotor 2, records by the built-in round grating of leading screw servomotor.The output pressure of three direction cylinders, is recorded by the tensimeter of the pressure regulator valve of pneumatic system.The suffered total frictional force of worktable 6, is recorded by three direction power sensors 17.
Embodiment
Testing table of the present invention adopts three direction cylinder load modes, the duty of Reality simulation milling machine, ball screw assembly, adopts double nuts structure (to apply for patent of invention, application number: 201410067042.7), under load test state, ball screw assembly, 5 drives worktable 6 to-and-fro movements by mother nut, and secondary nut is measured the moment of friction of ball screw assembly, by dynamometer link; Axial cylinder adopts two groups of symmetrical cylinders worktable to be loaded simultaneously.
The operation steps of this test bench is as follows,
Step 1: vertical loading cylinder 11 is arranged on and loads roller 9 by vertical cylinder on portal frame 10 worktable 6 is loaded, vertical cylinder loads between roller 9 and worktable 6 as rolling contacts; Side direction adds carrier gas cylinder 13 and is arranged on portal frame 10 sidepieces, and side direction adds carrier gas cylinder 13, by side direction cylinder loading roller 14, worktable 6 carried out to side direction loading, and side direction cylinder loads between roller 14 and worktable 6 and contacts for rolling; Axially two cylinders 12 are arranged on portal frame 10, and the two cylinder pistons 8 on axially two cylinders 12 are parallel with ball screw assembly, 5, and two cylinder pistons 8, by axial cylinder loading blocks 7, axially load worktable 6.
Step 2: between worktable 6 and the nut seat of ball screw assembly, 5, three direction power sensor and torque sensors are installed, three direction power sensors are block, and upper surface is directly connected with worktable 6, and lower surface is directly connected with ball screw assembly, 5 mother nut seats.For measuring the friction force of rolling guide-rail pairs.Torque sensor 15 is arranged between worktable 6 and secondary nut, and a side of torque sensor 6 keeps secondary nut seat upper surface parallel with table plane.This device is for measuring the moment of friction of ball screw assembly.
Step 3: between worktable 6 and testing table base 1, linear grating chi 16 is installed, moving chi is arranged on worktable bottom, and scale is arranged on rail-sides, with guide rail parallel.Between ball-screw and servomotor, adopt torque sensor 15 to connect, torque sensor both sides are installed shaft coupling and are connected respectively servomotor and ball-screw, and servomotor afterbody is coaxially installed with round grating.
Step 4: test adopts accelerates way of degeneration, adopt three direction cylinders to load worktable, simulation linear feed unit actual condition, the air pressure of each cylinder is by pneumatic system control, and two cylinders of axially two cylinders 12 are adjusted into synchronous operation mode by throttling valve.

Claims (4)

1. simulate the linear feed unit combination property degradation experiment platform of actual condition for one kind, it is characterized in that: this test bench comprises testing table base (1), leading screw servomotor (2), connect bearing (3), straight-line rolling guide set (4), ball screw assembly, (5), worktable (6), axial cylinder loading blocks (7), two cylinder pistons (8), vertical cylinder loads roller (9), portal frame (10), vertical cylinder (11), axially two cylinders (12), side direction adds carrier gas cylinder (13), side direction cylinder loads roller (14), torque sensor (15), linear grating chi (16), three direction power sensors (17), this test bench adopts three direction cylinder load modes, the duty of Reality simulation milling machine,
Leading screw servomotor (2) connects by being connected bearing (3) with ball screw assembly, (5), and be provided with torque sensor (15) in the junction that connects bearing (3) and ball screw assembly, (5), leading screw servomotor (2) is connected with ball screw assembly, (5) by shaft coupling and drives worktable (6) to carry out reciprocating action; Straight-line rolling guide set (4) is fixed on testing table base (1); Portal frame (10) is fixedly mounted on testing table base (1) both sides; Axial cylinder loading blocks (7) is fixed on worktable (6) axial location; Between worktable (6) and testing table base (1), linear grating chi (16) is installed, the moving chi of linear grating chi (16) is arranged on worktable (6) bottom, the scale of linear grating chi (16) is arranged on linear rolling track (4) side, parallel with straight-line rolling guide set (4);
Vertical loading cylinder (11) is arranged on portal frame (10) top, vertical loading cylinder (11) loads roller (9) by vertical cylinder worktable (6) is carried out to vertical direction loading, and vertical cylinder loads between roller (9) and worktable (6) and contacts for rolling;
Side direction adds carrier gas cylinder (13) and is arranged on portal frame (10) side, side direction adds carrier gas cylinder (13), by side direction cylinder loading roller (14), worktable (6) is carried out to side direction loading, and side direction cylinder loads between roller (14) and worktable (6) and contacts for rolling;
Axially two cylinders (12) are arranged on portal frame (10), two cylinder pistons (8) on axially two cylinders (12) are parallel with ball screw assembly, (5), two cylinder pistons (8) can contact with axial cylinder loading blocks (7), and worktable (6) is axially loaded; Between axial cylinder piston (8) and axial cylinder loading blocks (7), be provided with buffer rubber gasket.
2. the linear feed unit combination property degradation experiment platform of simulation actual condition according to claim 1, is characterized in that: worktable adopts three directions to load to simulate feed unit actual condition; Loading force is higher than actual condition load, consider two kinds of way of degeneration, the first, adopt at the uniform velocity top load way of degeneration to carry out precision degeneration experiment, the second, adopt worktable acceleration and deceleration operation to carry out precision degeneration experiment, the data that obtain by sensor in accelerated degradation test are set up accuracy prediction model, prediction work platform combination property degradation mechanism.
3. the linear feed unit combination property degradation experiment platform of simulation actual condition according to claim 1, is characterized in that: the cylinder of three directions all adopts constant voltage output, and output pressure is adjustable by pressure regulator valve; In order to obtain larger loading force, axial cylinder adopts two cylinders, and total loop and a point loop are equipped with throttling valve retaining valve in parallel, and being convenient to adjust two cylinders is synchronous operation.
4. the linear feed unit combination property degradation experiment platform of simulation actual condition according to claim 1, it is characterized in that: testing table measurement data of the present invention comprises, worktable (6) total load moment of torsion, records by torque sensor (15); Moment of friction between ball screw assembly, (5) and worktable (6), by double nut, mechanism measures; Worktable (6) straight-line displacement, records by linear grating chi (16); Grating scale adopts absolute encoding or relative type motor coding; The angular displacement of leading screw servomotor (2), records by the built-in round grating of leading screw servomotor; The output pressure of three direction cylinders, is recorded by the tensimeter of the pressure regulator valve of pneumatic system; The suffered total frictional force of worktable (6), is recorded by three direction power sensors (17).
CN201410438959.3A 2014-08-30 2014-08-30 Straight feed unit comprehensive performance degradation testbed capable of simulating actual working conditions Expired - Fee Related CN104198204B (en)

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104535355A (en) * 2015-01-15 2015-04-22 吉林大学 Heavy numerical control plano-boring and milling machine workbench feeding system reliability test bed
CN106289768A (en) * 2016-09-20 2017-01-04 山东博特精工股份有限公司 Leading screw, guide rail application system simulated condition laboratory table
CN107860672A (en) * 2017-10-29 2018-03-30 北京工业大学 Digit Control Machine Tool combines linear feed unit wear law experimental rig
CN108000236A (en) * 2018-01-08 2018-05-08 内蒙古科技大学 A kind of device for detecting lathe line slideway auxiliary accelerated wear test deterioration law
CN108073753A (en) * 2016-11-15 2018-05-25 财团法人工业技术研究院 System and method for designing feeding device of machine tool
CN108490878A (en) * 2018-03-17 2018-09-04 北京工业大学 A kind of numerically-controlled machine tool combination linear feed unit wear law test method
CN108555322A (en) * 2018-03-27 2018-09-21 南京航空航天大学 A kind of lathe feed system all-round property testing experimental rig and method
CN108645616A (en) * 2018-06-26 2018-10-12 北京工业大学 The random abrasion test method of ball screw assembly, based on preload with feeding rotating speed
CN109186984A (en) * 2018-09-30 2019-01-11 滨州学院 Nozzle and oil duct coaxial positioning apparatus
CN110842644A (en) * 2019-11-09 2020-02-28 北京工业大学 Method for monitoring contact stiffness degradation rate of machine tool moving part based on numerical control load information
CN111515755A (en) * 2020-04-08 2020-08-11 江苏大学 Guide rail performance test system

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CN202676449U (en) * 2012-06-12 2013-01-16 西南交通大学 Load controllable passive type servo-actuated force application linear guide rail pair test device
CN103909292A (en) * 2014-01-02 2014-07-09 一拖(洛阳)开创装备科技有限公司 Boring rod inserting device for combined machine tool

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202676449U (en) * 2012-06-12 2013-01-16 西南交通大学 Load controllable passive type servo-actuated force application linear guide rail pair test device
CN103909292A (en) * 2014-01-02 2014-07-09 一拖(洛阳)开创装备科技有限公司 Boring rod inserting device for combined machine tool

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104535355A (en) * 2015-01-15 2015-04-22 吉林大学 Heavy numerical control plano-boring and milling machine workbench feeding system reliability test bed
CN106289768A (en) * 2016-09-20 2017-01-04 山东博特精工股份有限公司 Leading screw, guide rail application system simulated condition laboratory table
CN108073753A (en) * 2016-11-15 2018-05-25 财团法人工业技术研究院 System and method for designing feeding device of machine tool
CN107860672B (en) * 2017-10-29 2019-11-15 北京工业大学 Numerically-controlled machine tool combines linear feed unit wear law experimental rig
CN107860672A (en) * 2017-10-29 2018-03-30 北京工业大学 Digit Control Machine Tool combines linear feed unit wear law experimental rig
CN108000236A (en) * 2018-01-08 2018-05-08 内蒙古科技大学 A kind of device for detecting lathe line slideway auxiliary accelerated wear test deterioration law
CN108490878A (en) * 2018-03-17 2018-09-04 北京工业大学 A kind of numerically-controlled machine tool combination linear feed unit wear law test method
CN108490878B (en) * 2018-03-17 2020-08-28 北京工业大学 Abrasion rule test method for combined linear feeding unit of numerical control machine tool
CN108555322A (en) * 2018-03-27 2018-09-21 南京航空航天大学 A kind of lathe feed system all-round property testing experimental rig and method
CN108645616A (en) * 2018-06-26 2018-10-12 北京工业大学 The random abrasion test method of ball screw assembly, based on preload with feeding rotating speed
CN109186984A (en) * 2018-09-30 2019-01-11 滨州学院 Nozzle and oil duct coaxial positioning apparatus
CN109186984B (en) * 2018-09-30 2023-06-23 滨州学院 Coaxial positioning device for nozzle and oil duct
CN110842644A (en) * 2019-11-09 2020-02-28 北京工业大学 Method for monitoring contact stiffness degradation rate of machine tool moving part based on numerical control load information
CN110842644B (en) * 2019-11-09 2021-02-02 北京工业大学 Method for monitoring contact stiffness degradation rate of machine tool moving part based on numerical control load information
CN111515755A (en) * 2020-04-08 2020-08-11 江苏大学 Guide rail performance test system

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