CN204514630U - A kind of numerically control grinder feed system reliability test - Google Patents
A kind of numerically control grinder feed system reliability test Download PDFInfo
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- CN204514630U CN204514630U CN201520236902.5U CN201520236902U CN204514630U CN 204514630 U CN204514630 U CN 204514630U CN 201520236902 U CN201520236902 U CN 201520236902U CN 204514630 U CN204514630 U CN 204514630U
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Abstract
A kind of numerically control grinder feed system reliability test, whole test unit is by Controlled by Programmable Controller, axial grinding force stretches out cylinder by hydraulic cylinder to load in leading screw one end, axial grinding force square drives fluid coupling to load one end of leading screw by servomotor, and the loading of radial feed power is stretched out cylinder effect by hydraulic cylinder and realized on the table; The positioning precision of feed unit is measured by components and parts such as High-precision angle scrambler, gratings, the moment of friction of leading screw is that the power that the dynamometer link be arranged on nut by force cell measurement is born realizes indirectly, temperature is by the temperature sensor measurement be arranged on antero posterior axis bearing and feed screw nut, and vibration acceleration is measured by the acceleration transducer be arranged on feed screw nut.This device can simulate the operating mode of numerically control grinder feed system, collects the reliability data of numerically control grinder feed system, in order to assess the reliability level of numerically control grinder feed system.
Description
Technical field
The utility model relates to a kind of test unit being used for evaluating numerically control grinder feed system reliability, and this device comprises basic mechanical part and observing and controlling part, belongs to Precision Manufacturing Technology and technical field of industrial automatic control.
Background technology
Numerically control grinder is the machine-tool of equipment manufacture, and its development level and productive capacity directly reflect the comprehensive strength of National Industrial, play vital effect in the national economic development.The performance of grinding machine decides the level of equipment manufacture, and the advanced numerically control grinder of China's numerically control grinder and the world also exists larger gap, and be mainly reflected in reliability aspect, particularly precision keeps and dependability aspect.Feed system is one of critical component affecting numerically control grinder reliability.
Numerically control grinder is used widely in machining manufacturing industry, utilizes numerical control program to control driven by servomotor wheel grinding axle class, plane, curved surface etc.Numerically control grinder is generally last procedure of precision component processing, so the efficiency of the quality of numerically control grinder performance and the height of the reliability precision of processing part and processing has important impact.
No matter be axle class numerically control grinder, or plane numerical controlled grinding machine and curved surface numerically control grinder all include feed system, the Main Function of feed system drives worktable to realize the straight-line feed of X-direction and Z-direction, so the height of feed system reliability will directly affect the machining precision of numerically control grinder by lead screw pair under the drive of servomotor.
There is the problems such as leading screw positioning precision is not enough, lead screw pair moment of friction is not enough, leading screw temperature rise is too high, worktable vibration is excessive, damage of components in feed system in numerically control grinder operational process, once there is these problems, the part processed is likely waste product, have a strong impact on production efficiency, even can cause serious security incident.
In order to improve the reliability of feed system, usually need the fault data gathering this system, then propose the measure of the reliability improving feed system according to fault data.Under routine work load, feed system fault is less, and the cycle obtaining reliability data is longer, therefore wants to obtain more data and just must carry out fail-test.
Servomotor rotating speed in feed system is different, grinding force is different, centripetal force is different, so test unit must can simulate different operating modes, the operating fault of adherence controlled grinder feed system, for the reliability of assessment numerically control grinder feed system provides data.
The test mainly no-load test of current numerically control grinder when designing to feed system, and seldom carry out reliability load test, cause the reliability basic data of numerically control grinder feed system little, designer cannot hold the reliability level of numerically control grinder feed system.
Summary of the invention
The purpose of this utility model is to provide a kind of reliability test of numerically control grinder feed system, this device can simulate the different operating mode of numerically control grinder, feed system is run with different rotating speeds, grinding force, grinding moment and centripetal force, Programmable Logic Controller and touch-screen preserve data, each parameter of observing and controlling part Real-Time Monitoring in operational process simultaneously, are calculated, evaluated the reliability of numerically control grinder feed system by the data gathered.
For achieving the above object, the technical solution adopted in the utility model is a kind of numerically control grinder feed system reliability test, and this test unit comprises basic mechanical part, observing and controlling part; Wherein, basic mechanical part comprises servomotor, screw pair etc.; Observing and controlling part comprises load loading section, parameter measurement part and electric control system, Motion loading part comprises hydraulic cylinder, fluid coupling, servomotor etc., parameter measurement part comprises force cell, temperature sensor, acceleration transducer, High-precision angle scrambler etc., and electric control system comprises Programmable Logic Controller, A.C. contactor, touch-screen etc.
Specifically, the utility model adopts following technological means to realize:
Leading screw (4) is supported by bearing a (6) and bearing b (16), leading screw (4) is connected with servomotor a (1) by shaft coupling (3), and servomotor a (1) is fixed on base b (38) by back up pad a (2); Feed screw nut (14) is arranged on that leading screw (4) is upper by threaded engagement and feed screw nut (14) and leading screw (4) form screw pair jointly; Worktable (10) is connected with leading screw (4) by feed screw nut (14), worktable (10) symmetria bilateralis installs two guide rail a (8), the guide rail b (35) be parallel to each other, worktable (10) by guide rail a (8) and guide rail b (35) constraint, and realizes the straight reciprocating motion along leading screw (4) direction under the drive of screw pair; Hydraulic cylinder a (9) is fixed on worktable (10) by four bolts (11), stretch out the loading of cylinder a (12) realization to worktable (10) by hydraulic cylinder, hydraulic cylinder a (9) is radial force loading hydraulic cylinder; Hydraulic cylinder b (20) is fixed by four hydraulic cylinder pillars (21), ensure that hydraulic cylinder stretches out cylinder b (19) in the surface level coaxial with leading screw (4), stretch out the loading of cylinder b (20) realization to leading screw (4) by hydraulic cylinder, hydraulic cylinder b (20) is axial force loading hydraulic cylinder; Axial moment is loaded and is connected with fluid coupling (23) by bevel gear d (25), bevel gear c (24) by servomotor b (28), fluid coupling (23) is connected with leading screw (4) by bevel gear b (22), bevel gear a (18), and servomotor b (28) is fixed on base plate a (27) by back up pad b (26).
Circular gratings (7) is arranged on the bearing seat of bearing a (6), and Circular gratings (7) is in order to measure the input corner of leading screw (4); It is upper and supported by two symmetrical grating scale pillars (36) that long grating scale (33) is arranged on grating scale installing plate (32), grating ruler reading head (30) is arranged on long grating scale (33) and goes up and read the data on long grating scale (33), i.e. the output displacement of leading screw (4); By High-precision angle scrambler (59), the input corner of measurement and output displacement are transferred to Programmable Logic Controller (57), and are kept at touch-screen (48), to estimate and to evaluate the axial location precision of feed system.Force cell (40) by measuring the power be arranged on the dynamometer link (39) of feed screw nut secondary surface, and then changes into the moment of friction that leading screw (4) is delivered to worktable (10).Temperature sensor a (5), temperature sensor c (17) and temperature sensor b (13) are arranged on bearing a (6), the base of bearing b (16) and feed screw nut (14) respectively, the measuring-signal of three sensors transfer to touch-screen (48) respectively by Programmable Logic Controller (57) and preserved, the temperature rise situation of detection system.Acceleration transducer a (15), acceleration transducer b (31) are arranged on the axial, radial of feed screw nut (14) respectively, two sensors send data to touch-screen (48) respectively by Programmable Logic Controller (57) and preserved, the vibration of the operating mode of testing platform (10).
Whole test unit is controlled by Programmable Logic Controller (57).Programmable Logic Controller (57) sends signal to servo-driver b (58), and servo-driver b (58) drives servomotor a (1) to rotate, thus drives leading screw (4) with different rotation speed operation.Programmable Logic Controller (57) sends signal to hydraulic cylinder a (9), and hydraulic cylinder a (9) drives hydraulic cylinder to stretch out cylinder a (12) motion, thus applies different centripetal forces to worktable (10).Programmable Logic Controller (57) sends signal to hydraulic cylinder b (20), and hydraulic cylinder b (20) drives hydraulic cylinder to stretch out cylinder b (19) motion, thus applies different grinding forces to worktable (10).Programmable Logic Controller (57) sends signal to servo-driver a (50), servo-driver a (50) drives servomotor b (28) to rotate, drive fluid coupling (23) running, thus apply different grinding moment to leading screw.
In system operation, the measurement data of each sensor of Programmable Logic Controller (57) real-time reception and grating, and compare with permissible value, once find to exceed permissible value, or basic mechanical part breaks down, Programmable Logic Controller (57) controls servo-driver a (1) and servo-driver b (28) immediately to be stopped, and controls red led (47) flicker simultaneously.Programmable Logic Controller (57) sends signal to touch-screen (48), and touch-screen (48) is preserved and shows fault-signal.After failture evacuation, can by reset button (55), worktable (10) return reference point, and then press start button (53) startup optimization.After off-test, the failure message in statistics touch-screen (48), in order to calculate, to assess the reliability level of numerically control grinder feed system.
The beneficial effect that the utility model has is:
1, test unit described in the utility model can simulate the condition of work of numerically control grinder feed system, the fault data of record numerically control grinder feed system, thus calculates and evaluate the reliability level of numerically control grinder feed system.
2, test unit described in the utility model can be tested according to the feed system of different numerically-controlled machine, only need to change servo-driver and servomotor simply, and after pressing start button, system is run according to predetermined speed, rate of loading automatically, middle without the need to manual operation, the automatic record trouble data when breaking down.
The utility model is applicable to the fail-test of numerically control grinder feed system, when the reliability design of numerically control grinder, is used for evaluating the reliability level of feed system, has good application prospect.
Accompanying drawing explanation
Fig. 1 is the machine construction principle figure of numerically control grinder feed system reliability test;
Fig. 2 is the screw pair measurement of friction torque schematic diagram of numerically control grinder feed system reliability test;
Fig. 3 is the electric control theory figure of numerically control grinder feed system reliability test;
Fig. 4 is the servomotor a speed diagram of numerically control grinder feed system reliability test;
Fig. 5 is that the radial force of numerically control grinder feed system reliability test loads hydraulic diagram;
Fig. 6 is that the axial force of numerically control grinder feed system reliability test loads hydraulic diagram
Fig. 7 is the servomotor b speed diagram of numerically control grinder feed system reliability test;
In figure: 1. servomotor a, 2. back up pad a, 3. shaft coupling, 4. leading screw, 5. temperature sensor a, 6. bearing a, 7. Circular gratings, 8. guide rail a, 9. hydraulic cylinder a, 10. worktable, 11. bolts, 12. hydraulic cylinders stretch out cylinder a, 13. temperature sensor b, 14. feed screw nuts, 15. acceleration transducer a, 16. bearing b, 17. temperature sensor c, 18. bevel gear a, 19. hydraulic cylinders stretch out cylinder b, 20. hydraulic cylinder b, 21. hydraulic cylinder pillars, 22. bevel gear b, 23. fluid couplings, 24. bevel gear c, 25. bevel gear d, 26. back up pad b, 27. base a, 28. servomotor b, 29. limitation travel switch a, 30. grating ruler reading heads, 31. acceleration transducer b, 32. grating scale installing plates, 33. long grating scales, 34. initial point travel switches, 35. guide rail b, 36. grating scale pillars, 37. limitation travel switch b, 38. base b, 39. dynamometer links, 40. force cells, 41. ac contactor contact a, 42. electrohydraulic servo valve a, 43. electrohydraulic servo valve b, 44. A.C. contactor a, 45. A.C. contactor b, 46. green indicating lamps, 47. red leds, 48. touch-screens, 49. ac contactor contact b, 50. servo-driver a, 51. fluid coupling switches, 52. grating switch, 53. start buttons, 54. stop buttons, 55. reset button, 56. emergency stop push buttons, 57. Programmable Logic Controllers, 58. servo-driver b, 59. High-precision angle scramblers.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further described.
Fig. 1 is the machine construction principle figure of test unit, servomotor a (1) drives leading screw (4) to rotate, leading screw (4) drives worktable (10) motion, and guide rail a (8), guide rail b (35) play the guiding role to worktable (10).Control servo-driver b (58) to change the rotating speed of servomotor (1) by Programmable Logic Controller (57) in Fig. 3, thus simulation numerically control grinder is adding different speed in man-hour.Servomotor b (28) realizes loading the grinding moment of leading screw (4) by driving fluid coupling (23) running.Control servo-driver a (50) to change the rotating speed of servomotor (28) by Programmable Logic Controller (57) in Fig. 3, thus simulation numerically control grinder is adding different grinding moment in man-hour.Stretch out cylinder a (12) respectively by hydraulic cylinder respectively by Programmable Logic Controller (57) hydraulic control cylinder a (9) in Fig. 3, hydraulic cylinder b (20), hydraulic cylinder stretches out cylinder b (19) and apply different load to worktable (10), leading screw (4).In operational process, Programmable Logic Controller (57) in Fig. 3 controls Circular gratings (7), long grating gauge head (30), temperature sensor (5) (13) (17), acceleration transducer (15) (31) to carry out measurement in real time to each parameter and monitors, and by touch-screen (48) real time record in Fig. 3.
Fig. 2 is the screw pair measurement of friction torque schematic diagram of test unit, Programmable Logic Controller (57) in Fig. 3 is controlled force cell (40) and is measured the moment of friction produced because leading screw (4) drives feed screw nut (14) to rotate by dynamometer link (39), and by touch-screen (48) real time record in Fig. 3.
Fig. 3 is the electric control theory figure of test unit, Programmable Logic Controller (57) is the core of electric control system, it controls energising and the power-off of servo-driver b (58) and servo-driver a (50) by controlling A.C. contactor (44) and (45), Programmable Logic Controller (57) sends signal to control the speed of servomotor (1) and servomotor (28) by data line respectively to servo-driver b (58) and servo-driver a (50) simultaneously.
Fig. 4 is the servomotor a speed diagram of test unit, Fig. 5 is that the radial force of test unit loads hydraulic diagram, Fig. 6 is that the axial force of test unit loads hydraulic diagram, Fig. 7 is the servomotor b speed diagram of test unit, servomotor a (1) starts to rotate with the speed band movable wire thick stick (4) of n1, radial force loading hydraulic cylinder applies the load of P11, axial force loading hydraulic cylinder applies the load of P21, servomotor b (28) applies the load of n21, leading screw (4) runs 1000 bouts, completes a circulation.
On-test, Programmable Logic Controller (57) controls all elements and obtains electric, waits for next command.If worktable is not or not initial point place, press reset button (55), servomotor a (1) reverses, and drives worktable (10) to return initial point.After worktable (10) returns initial point, press start button (53), Programmable Logic Controller (57) controls A.C. contactor a (44) and obtains electric, ac contactor contact a (41) closes, Programmable Logic Controller (57) controls load, the load of axial force loading hydraulic cylinder applying P21, the load of servomotor b (28) applying n21 that servomotor a (1) rotates forward with the speed of n11, radial force loading hydraulic cylinder applies P11 respectively, and leading screw (4) runs 1000 bouts.Complete a rear Programmable Logic Controller (57) of circulation, A.C. contactor b (45), electrohydraulic servo valve a (42), electrohydraulic servo valve b (43) dead electricity, Motion loading part stops loading, Programmable Logic Controller (57) drives worktable (10) to return initial point by controlling servomotor a (1) reversion simultaneously, after time delay a period of time, realize five kinds of rotating speed load of servomotor a (1) more respectively, three kinds of pressure load of hydraulic cylinder a (9), five kinds of pressure load of hydraulic cylinder b (20), whole combined load schemes of three kinds of rotating speed load of servomotor b (28), amount to 224 kinds, the enforcement of above-mentioned load scheme carries out load intensity test alone or in combination to each rotating speed load and pressure load, under often kind of density of load, leading screw (4) runs 1000 bouts.
While pressing start button (53), each element of Programmable Logic Controller (57) controling parameters measure portion respectively enters duty, i.e. Circular gratings (7), long grating scale (33), High-precision angle scrambler (59), force cell (40), temperature sensor a (5), temperature sensor b (13), temperature sensor c (17) and acceleration transducer a (15), acceleration transducer b (31) enters duty, and by Programmable Logic Controller (57), real-time measuring data is stored in touch-screen (48).
When pressing start button (53), Programmable Logic Controller (57) controls green indicating lamp (46) Chang Liang, and expression system is run.
Once each parameter exceeds normal value or has fault to occur in system operation, Programmable Logic Controller (57) sends stop signal to servo-driver b (58), servo-driver a (50), hydraulic cylinder a (9) and hydraulic cylinder b (20) immediately, all components and parts shut down immediately, Programmable Logic Controller (57) sends instruction to touch-screen (48) simultaneously, and touch-screen (48) shows and preserves fault-time and fault type.Programmable Logic Controller (57) controls green indicating lamp (46) and goes out, and controls red led (47) flicker.After failture evacuation, by reset button (55), worktable (10) returns initial point, and then presses start button (53) startup optimization.
In operational process, press stop button (54), Programmable Logic Controller (57) sends reverse impulse signal to servo-driver b (58), stops after worktable (10) runs to initial point.Meanwhile, Programmable Logic Controller (57) sends halt instruction to parameter measurement part, controls each components and parts and quits work.
In operational process, press emergency stop push button (56), Programmable Logic Controller (57) sends stop signal immediately to servo-driver b (58), and worktable (10) original place stops.Meanwhile, Programmable Logic Controller (57) sends halt instruction to observing and controlling part, controls each components and parts and quits work.
The above embodiment is used for explaining and the utility model is described, instead of limits the utility model.In the protection domain of design philosophy of the present utility model and claim, any amendment or change are made to the utility model, protection domain of the present utility model all should be considered as.
Claims (2)
1. a numerically control grinder feed system reliability test, it is characterized in that: leading screw (4) is supported by bearing a (6) and bearing b (16), leading screw (4) is connected with servomotor a (1) by shaft coupling (3), and servomotor a (1) is fixed on base b (38) by back up pad a (2); Feed screw nut (14) is arranged on that leading screw (4) is upper by threaded engagement and feed screw nut (14) and leading screw (4) form screw pair jointly; Worktable (10) is connected with leading screw (4) by feed screw nut (14), worktable (10) symmetria bilateralis installs two guide rail a (8), the guide rail b (35) be parallel to each other, worktable (10) by guide rail a (8) and guide rail b (35) constraint, and realizes the straight reciprocating motion along leading screw (4) direction under the drive of screw pair; Hydraulic cylinder a (9) is fixed on worktable (10) by four bolts (11), stretch out the loading of cylinder a (12) realization to worktable (10) by hydraulic cylinder, hydraulic cylinder a (9) is radial force loading hydraulic cylinder; Hydraulic cylinder b (20) is fixed by four hydraulic cylinder pillars (21), ensure that hydraulic cylinder stretches out cylinder b (19) in the surface level coaxial with leading screw (4), stretch out the loading of cylinder b (20) realization to leading screw (4) by hydraulic cylinder, hydraulic cylinder b (20) is axial force loading hydraulic cylinder; Axial moment is loaded and is connected with fluid coupling (23) by bevel gear d (25), bevel gear c (24) by servomotor b (28), fluid coupling (23) is connected with leading screw (4) by bevel gear b (22), bevel gear a (18), and servomotor b (28) is fixed on base plate a (27) by back up pad b (26);
Circular gratings (7) is arranged on the bearing seat of bearing a (6), and Circular gratings (7) is in order to measure the input corner of leading screw (4); It is upper and supported by two symmetrical grating scale pillars (36) that long grating scale (33) is arranged on grating scale installing plate (32), grating ruler reading head (30) is arranged on long grating scale (33) and goes up and read the data on long grating scale (33), i.e. the output displacement of leading screw (4); By High-precision angle scrambler (59), the input corner of measurement and output displacement are transferred to Programmable Logic Controller (57), and are kept at touch-screen (48); Force cell (40) by measuring the power be arranged on the dynamometer link (39) of feed screw nut secondary surface, and then changes into the moment of friction that leading screw (4) is delivered to worktable (10); Temperature sensor a (5), temperature sensor c (17) and temperature sensor b (13) are arranged on bearing a (6), the base of bearing b (16) and feed screw nut (14) respectively, the measuring-signal of three sensors transfer to touch-screen (48) respectively by Programmable Logic Controller (57) and preserved, the temperature rise situation of detection system; Acceleration transducer a (15), acceleration transducer b (31) are arranged on the axial, radial of feed screw nut (14) respectively, and two sensors sends data to touch-screen (48) respectively by Programmable Logic Controller (57) and preserved.
2. a kind of numerically control grinder feed system reliability test according to claim 1, is characterized in that: whole test unit is controlled by Programmable Logic Controller (57).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111209676A (en) * | 2020-01-10 | 2020-05-29 | 西南交通大学 | Dynamic grinding force measuring method for grinding device |
| CN112649194A (en) * | 2021-01-11 | 2021-04-13 | 山东大学 | Ball screw pair loading test device and test method |
-
2015
- 2015-04-19 CN CN201520236902.5U patent/CN204514630U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111209676A (en) * | 2020-01-10 | 2020-05-29 | 西南交通大学 | Dynamic grinding force measuring method for grinding device |
| CN111209676B (en) * | 2020-01-10 | 2022-04-29 | 西南交通大学 | Dynamic grinding force measuring method for grinding device |
| CN112649194A (en) * | 2021-01-11 | 2021-04-13 | 山东大学 | Ball screw pair loading test device and test method |
| CN112649194B (en) * | 2021-01-11 | 2021-10-22 | 山东大学 | Ball screw pair loading test device and test method |
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