CN101944795B - Electric main shaft structure capable of realizing self-examination of thermal extension - Google Patents
Electric main shaft structure capable of realizing self-examination of thermal extension Download PDFInfo
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- CN101944795B CN101944795B CN2010102355630A CN201010235563A CN101944795B CN 101944795 B CN101944795 B CN 101944795B CN 2010102355630 A CN2010102355630 A CN 2010102355630A CN 201010235563 A CN201010235563 A CN 201010235563A CN 101944795 B CN101944795 B CN 101944795B
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- main shaft
- sleeve
- thermal extension
- thermal
- thermal stretching
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Abstract
The invention discloses an electric main shaft structure capable of realizing self-examination of thermal extension. A stator is fixed on an inner cylindrical surface of a sleeve, wherein a main shaft is arranged in a front main shaft bearing seat and a rear main shaft bearing at the two ends of a sleeve hole; a rotor fixed on the main shaft is in running fit with the stator; a non-contact displacement sensor for measuring the thermal extension of the rotor relative to the sleeve is sleeved on the main shaft at the front end; the non-contact displacement sensor is fixed in a front main shaft bearing end cover; and a temperature sensor for measuring temperature distribution of the sleeve is uniformly arranged on an outer cylindrical surface of the sleeve. By the self-examination of the thermal extension, the machining error caused by the thermal extension can be very easily compensated. The structure can detect the thermal extension of the main shaft in real time, also detect axial play of the main shaft and solve the problem of measuring the thermal extension of the main shaft in a machining field. The main shaft structure is particularly applied to aerospace and high-accuracy machining of precise moulds.
Description
Technical field
The present invention relates to electric main axle structure, especially relate to the self-monitoring electric main axle structure of a kind of thermal stretching.
Background technology
The electricity main shaft is the abbreviation of " Fast frequency spindle ", is built-in type electric machine main shaft unit.It is the contraction in length of Machine Tool Main Drive chain zero, has realized " zero transmission " of lathe, has that compact conformation, mechanical efficiency are high, speed of gyration and an advantage such as rotating accuracy is high, noise is low, vibration is little.The application of electricity main shaft has improved working (machining) efficiency and crudy greatly, has reduced product cost, is one of most important function parts of the high-precision lathe of Modern High-Speed.Yet along with the raising of the electric speed of mainshaft, the frictional heating amount of the magnetic effect of mover and stator heating, bearing is very big, causes electric main shaft along with the growth of operating time, and its axial thermal stretching is also increasing.For the part processing of routine, because the dimension precision requirement of depth direction is not high, so influence is little.But as far as widely used 3 D complex curved surface in Aero-Space, the precision die, the thermal stretching meeting of its depth direction causes having on the curved surface comparatively significantly step, thereby has a strong impact on the machining accuracy of curved surface.
This way to solve the problem mainly contains 1, adopts thermal tracking at present, and heat optimization is analyzed design, comes to reduce to greatest extent the thermal stretching of main shaft; 2, adopt before the processing earlier hot error to detect,, and monitor the temperature of main shaft in real time, thereby dope the thermal stretching of main shaft then through modeling to main shaft.The shortcoming of method 1 is the thermal stretching that can reduce electric main shaft; But nowadays at a high speed, high-precision processing becomes trend, and the working speed of electric main shaft can be increasingly high; High caloric value is inevitably certainly, thereby the influence that can't effectively avoid thermal stretching and caused of this method.And that the shortcoming of method 2 is integrated levels is low, the thermal stretching that can't realize detecting in real time main shaft, and simultaneously at dissimilar main shafts, under the different processing technologys, the rule of main shaft thermal stretching also is not quite similar, and need do a large amount of experiments and could obtain compensation effect preferably.
If the thermal stretching that can realize main shaft is done corresponding error from detecting according to testing result notice digital control system, be undoubtedly a kind of more satisfactory and reliable mode.And adding man-hour because the rotating speed of electric main shaft surpasses 6000r/min usually, the field working conditions that adds man-hour is also quite complicated, makes to add the unusual difficulty of thermal stretching that directly detects main shaft man-hour.Thereby design a kind of self-monitoring electric main axle structure of thermal stretching function that carries, just seem is necessary very much.
Summary of the invention
For fear of the mismachining tolerance that electric main shaft thermal stretching is caused, the object of the present invention is to provide the self-monitoring electric main axle structure of a kind of thermal stretching, can detect the thermal stretching of main shaft in real time through this structure, can also detect the axial endplay of main shaft.
The technical solution adopted for the present invention to solve the technical problems is following:
The present invention is fixed with stator on the sleeve inner cylinder face; Be installed in main spindle front bearing seat and the mainshaft rear bearing at sleeve hole two ends main shaft is installed; Be fixed between mover and the stator on the main shaft to being rotatably assorted; Be used to measure mover and be enclosed within the front end main shaft with respect to the non-contact displacement sensor of sleeve thermal stretching, non-contact displacement sensor is fixed in the main spindle front bearing end cap, and the temperature sensor that is used to measure the Temperature Distribution of sleeve axially is evenly arranged in the external cylindrical surface of sleeve.
Described temperature sensor is an occasionally thermal resistance of thermoelectricity, and the number of temperature sensor is 2～10.
The useful effect that the present invention has is:
Through the detection certainly to thermal stretching, the mismachining tolerance that thermal stretching caused can be easy to compensated, and the present invention can detect the main shaft thermal stretching in real time, also can detect the axial endplay of main shaft, has avoided measuring at processing site the difficult problem of main shaft thermal stretching.This main axle structure is particularly suitable for the high-precision processing of Aero-Space, precision die.
Description of drawings
Accompanying drawing is the self-monitoring electric main axle structure sketch map of thermal stretching.
Among the figure: 1. main spindle front bearing end cap, 2A. main spindle front bearing seat, 2B. mainshaft rear bearing seat, 3. sleeve, 4. temperature sensor, 5. mainshaft rear bearing end cap, 6. bearing, 7. mover, 8. stator, 9. non-contact displacement sensor, 10. main shaft.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described further.
Shown in accompanying drawing; On sleeve 3 inner cylinder faces, be fixed with stator 8; Be installed in the bearing 6 of main spindle front bearing seat 2A and mainshaft rear bearing seat 2B at two ends, sleeve 3 hole main shaft 10 is installed; Be fixed between mover 7 and the stator 8 on the main shaft 10 to being rotatably assorted; Be used to measure mover 7 and be enclosed within the front end main shaft with respect to the non-contact displacement sensor 9 of sleeve 3 thermal stretchings, non-contact displacement sensor 9 is fixed in the main spindle front bearing end cap 1, and the temperature sensor 4 that is used to measure the Temperature Distribution of sleeve 3 axially is evenly arranged in the external cylindrical surface of sleeve 3; Sleeve 3, main spindle front bearing end cap 1 and mainshaft rear bearing end cap 5 encapsulate electric main shaft and support unit thereof, play the effect of protection and electromagnetic isolation.
Described temperature sensor 4 is an occasionally thermal resistance of thermoelectricity, and the number of temperature sensor 4 is 2～10, detects the Temperature Distribution of sleeve, and calculates the thermal stretching of sleeve.
The thermal stretching computational methods of sleeve are following: N temperature sensor is evenly arranged on the sleeve, and the total length of establishing sleeve is L, and the thermal coefficient of expansion of sleeve is δ, and the temperature of N temperature sensor is T
1-T
N, then the thermal stretching of sleeve does
Temperature sensor can be selected thermocouple for use, and thermal resistance, the number of temperature sensor are preferably 3.
Symmetry is installed two non-contact displacement transducers on electric main shaft lower tooth wheel seat, is used to detect the thermal stretching of mover with respect to sleeve; Non-contact displacement transducer is an inductive displacement transducer, and two detected thermal stretchings of non-contact displacement transducer are λ
1, λ
2For fear of the non-contact displacement transducer installation errors, final stator is
with respect to the thermal stretching of sleeve
The thermal stretching of the final electric main shaft that obtains is Δ+λ, and this value can be sent into and notify digital control system to carry out the thermal stretching of real-Time Compensation electricity main shaft in the digital control system.
Because the axial endplay of electric main shaft is the important performance indexes of electric main shaft, the present invention can also measure the axial endplay of main shaft through non-contact displacement transducer.
The computational methods of axial endplay are following: the thermal stretching of considering the relative sleeve of electric main shaft mover is a slow variable quantity, so (2-5min) can think that the thermal stretching of the relative sleeve of mover does not change at short notice.And during the work of electric main shaft; Its rotating speed surpasses 2000r/min; Thereby in 2min; Main shaft turns over 4000 to be changeed, as long as
is that 33.33HZ is effective sampled value.At first close electric main shaft, treat that recording the initial displacement amount after main shaft is stablized is θ
1, θ
2After opening main shaft then and treating that spindle operation is stable, with the sample frequency of 20HZ, 240 movers of sampling are with respect to the position data of sleeve in 2min, and the data of two sensor measurements are respectively ε
1-ε
240, η
1-η
240, then final axial endplay does
Claims (2)
1. self-monitoring electric main axle structure of thermal stretching; It is characterized in that: on sleeve (3) inner cylinder face, be fixed with stator (8); Be installed in main spindle front bearing seat (2A) and the mainshaft rear bearing seat (2B) at sleeve (3) two ends, hole main shaft (10) is installed; Be fixed between mover (7) and the stator (8) on the main shaft (10) to being rotatably assorted; Be used to measure mover (7) and be enclosed within the front end main shaft with respect to the non-contact displacement sensor (9) of sleeve (3) thermal stretching, non-contact displacement sensor (9) is fixed in the main spindle front bearing end cap (1), and the temperature sensor (4) that is used to measure the Temperature Distribution of sleeve (3) axially is evenly arranged in the external cylindrical surface of sleeve (3).
2. the self-monitoring electric main axle structure of a kind of thermal stretching according to claim 1 is characterized in that: described temperature sensor (4) is an occasionally thermal resistance of thermoelectricity, and the number of temperature sensor (4) is 2～10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102355630A CN101944795B (en) | 2010-07-23 | 2010-07-23 | Electric main shaft structure capable of realizing self-examination of thermal extension |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102355630A CN101944795B (en) | 2010-07-23 | 2010-07-23 | Electric main shaft structure capable of realizing self-examination of thermal extension |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101944795A CN101944795A (en) | 2011-01-12 |
| CN101944795B true CN101944795B (en) | 2012-03-07 |
Family
ID=43436630
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010102355630A Expired - Fee Related CN101944795B (en) | 2010-07-23 | 2010-07-23 | Electric main shaft structure capable of realizing self-examination of thermal extension |
Country Status (1)
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| CN (1) | CN101944795B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111896390A (en) * | 2019-05-06 | 2020-11-06 | 黄国轩 | Thermal elongation measuring device |
| CN110756830B (en) * | 2019-11-15 | 2022-03-18 | 重庆工商大学 | Intelligent high-speed motorized spindle integrating multi-parameter detection |
| CN113154016B (en) * | 2020-01-07 | 2022-10-14 | 黄国轩 | Cooling system of shaft rotating equipment |
| CN113977353A (en) * | 2021-11-30 | 2022-01-28 | 江苏大卫精工科技有限公司 | Method for testing thermal elongation of boring machine spindle |
| CN116460321B (en) * | 2023-04-12 | 2024-02-09 | 阿帕斯数控机床制造(上海)有限公司 | Compensation method and device for elongation of spindle of numerical control machine tool and numerical control machine tool |
| CN117697532B (en) * | 2024-02-04 | 2024-04-12 | 无锡博华机电有限公司 | High-precision motorized spindle thermal elongation detection device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63204107A (en) * | 1987-02-19 | 1988-08-23 | Fuji Electric Co Ltd | Apparatus for detecting displacement quantity of ball bearing in axial direction |
| CN201399700Y (en) * | 2009-03-20 | 2010-02-10 | 宁波海天精工机械有限公司 | Thermal resistor type thermal elongation compensation device for main shaft |
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2010
- 2010-07-23 CN CN2010102355630A patent/CN101944795B/en not_active Expired - Fee Related
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| CN101944795A (en) | 2011-01-12 |
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