CN102335755A - Large-sized precise direct-driving main shaft structure - Google Patents
Large-sized precise direct-driving main shaft structure Download PDFInfo
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- CN102335755A CN102335755A CN2011102828111A CN201110282811A CN102335755A CN 102335755 A CN102335755 A CN 102335755A CN 2011102828111 A CN2011102828111 A CN 2011102828111A CN 201110282811 A CN201110282811 A CN 201110282811A CN 102335755 A CN102335755 A CN 102335755A
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Abstract
The invention relates to a large-sized precise direct-driving main shaft structure of a numerical control machine in the technical field of mechanical engineering, which comprises a main shaft structure formed by utilizing a liquid dynamic and static hydraulic technology and an electrical main shaft technology, and a precise direct-driving numerical control machine tool main shaft part which can realize large-sized liquid dynamic and static hydraulic bearings, wherein the precise direct-driving numerical control machine tool main shaft part is internally provided with a motor. The motor is arranged between the front dynamic and static hydraulic bearing and the rear dynamic and static hydraulic bearing; according to the direct-driving structure, the span of the bearings of the main shaft is increased; when the motor drives the main shaft to rotate, due to the external force action of a transmission link, the main shaft only bears the peripheral rotating torque without bearing the radial driving force, is more balanced due to no middle transmission impact during the high-speed operation of the main shaft, and the accuracy of a processed part is higher. The large-sized precise direct-driving main shaft structure has the advantages of high accuracy, large rigidity, long service life, good shock absorption property and vibration resistance, and excellent work stability and reliability, and can be used for the main shafts of precise processing machinery and the main shafts of high-speed and high-precise equipment.
Description
Technical field
What the present invention relates to is a kind of big accurate direct-drive type main axle structure with a high standard of Digit Control Machine Tool of mechanical engineering technical field.
Background technology
Digit Control Machine Tool is the main product of machine tool industry, and the high-speed precision digital control lathe is one of technical foundation and developing direction of equipment manufacture, is the strategic industry of equipment manufacture.The service behaviour of high-speed precision digital control lathe; The performance that at first depends on the high speed and precision main shaft; The high speed and precision axis system always is exactly one of Digit Control Machine Tool three big new and high technologies; And in order to improve spindle speed and machining accuracy, built-in type electricity main shaft just becomes the preferably selection of main shaft of numerical control machine tool structure.
The key that realizes electric main shaft high speed, precise treatment is the application of precision bearing; What in the high-speed and precise electric main shaft, mainly use at present is accurate angular contact ball bearing and accurate cylinder roller bearing; But it is little that these bearings and dynamic and hydrostatic bearing are compared bearing capacity, and precision is not high, and service life is short.Though have few part to use the main axle structure of hydrodynamic and hydrostatic pressure bearing, gas dynamic and hydrostatic bearing and magnetic suspension bearing, its specification is all smaller.
Summary of the invention
The objective of the invention is to hydrodynamic and hydrostatic pressure bearing technology and electric spindle technology are combined; Realize that big specification precision directly drives main axle structure, not only can guarantee the very high rotating accuracy of main shaft, rigidity and rotating speed, and simple in structure; Number of parts is few; Can reduce the mechanical processing difficulty that the main spindle box axon is held installing hole and main shaft supporting external diameter greatly, cut down finished cost, prolong bearing service life.
Briefly, a kind of big specification precision is directly driven main axle structure, and it is hydrodynamic and hydrostatic pressure structure and electric main shaft to be combined as a whole constitute precision and directly drive main shaft.
Specifically, big specification precision is directly driven main axle structure, and it comprises main shaft casing, main shaft, preceding hydrostatic bearing, rear bearing block, back hydrostatic bearing, motor rotor, motor stator; Preceding hydrostatic bearing outer ring cooperates with the hole of main shaft casing, and its internal diameter cooperates with the main shaft external diameter; Back hydrostatic bearing outer ring cooperates with the rear bearing block endoporus, and its internal diameter cooperates with the main shaft external diameter; Motor rotor, motor stator are loaded between the forward and backward hydrostatic bearing; Be shaped on the main shaft casing forward and backward hydrostatic bearing into and out of hydraulic fluid port and main shaft cooling fluid liquid inlet and outlet.
The invention has the beneficial effects as follows: motor is loaded between the forward and backward hydrostatic bearing, and the contraction in length of main transmission chain is zero, has realized " zero transmission " of lathe, rationally distributed, compact conformation; Employing hydrodynamic and hydrostatic pressure technology, precision is high, rigidity is big, the life-span is long, the absorbing performance is good, and job stability and good reliability can be used for the main shaft of precision processing machine and high speed, high precision apparatus.Realized hydrodynamic journal liquid polymers diameter of phi 160mm, inner electric machine power 67.4Kw, the big specification precision of maximum speed 5000r/min is directly driven spindle unit.
Description of drawings
Fig. 1 is a structure diagram of the present invention.
Fig. 2 is an II portion enlarged drawing among Fig. 1.
Fig. 3 is a hermetic seal structure diagram of the present invention.
Be labeled as among the figure: 1. main shaft casing, 2. main shaft, 3. before hydrostatic bearing, 4. rear bearing block, 5. back hydrostatic bearing; 6. motor rotor, 7. thrust ring, 8. locking nut, 9. motor stator; 10. forward flange, 11. sealing rings, 12. electric main shaft stator flanges, the import of A hydraulic oil; B hydraulic fluid leak mouth, the outlet of C hydraulic oil, D hydraulic fluid leak chamber, the import of E sealing gas.
The specific embodiment
Provided the specific embodiment of the invention like Fig. 1-3.The main inventive point of the present invention is: hydrodynamic and hydrostatic pressure spindle technology and structure; Built-in type electricity spindle technology and structure.Specific embodiments is:
Preceding hydrostatic bearing outer ring cooperates with the main spindle box body opening, internal diameter cooperates with the main shaft external diameter; Be provided with thrust ring between preceding hydrostatic bearing and the main shaft; Back hydrostatic bearing outer ring cooperates with the rear bearing block endoporus, internal diameter cooperates with the main shaft external diameter; Motor layout is between forward and backward hydrostatic bearing; Each respective aperture in the main shaft casing, as hydrostatic bearing into and out of hydraulic fluid port, electric main shaft cooling fluid liquid inlet and outlet.
Motor rotor cooperates with the main shaft external diameter, is loaded between the forward and backward hydrostatic bearing, and stator is connected through electric main shaft stator flange and main shaft casing, and its external diameter cooperates with the main spindle box body opening.This direct-drive type structure has strengthened design of spindle bearings distance, and frame for movement is more simple, and rotary inertia is little, thereby fast-response is good.During the motor driven main axis rotation, owing to there has not been the external force effect of middle transmission link, main shaft does not bear radial drive power, only bears the moment that rotates in a circumferential direction, and the main shaft high-speed cruising does not have middle transmission impact and balance more, and the processing parts precision is higher.
Dynamic and hydrostatic bearing is a monolithic construction, and bearing and box body hole contact area are big, for being rigidly connected, makes oil film rigidity obtain fully playing utilization; When main shaft rotates at a high speed; Because forming dynamic and static pressure naturally, alias carries oil film in the bearing oil pocket; Bearing becomes the hydrodynamic sliding bearing with static pressure pressure field, and oil film rigidity is the stack of bearing static rigidity and dynamic rate, makes main shaft that very strong radial and axial bearing capacity arranged; " homogenizing " of pressure oil film effect can make spindle rotation accuracy be higher than the machining accuracy and the surface roughness of axle journal, improves the machine tool chief axis precision, and can use continuously for many years and do not need repairing.
In structure diagram 1; Main shaft casing 1 is the main structure supporting member; Form the static pressure chamber between main shaft 2 and preceding hydrostatic bearing 3, the back hydrostatic bearing 5, the hydraulic oil oil-in got into the static pressure chamber of forward and backward hydrostatic bearing after hydraulic oil was gone forward through the main shaft casing, formed the static pressure oil film; Main shaft bottom half inner chamber is the hydraulic fluid leak chamber, flows out through its hydraulic oil outlet and leaks fluid.Motor is a power-driven system, places between the forward and backward hydrostatic bearing, and driving main shaft 2 is rotated and worked.The electricity spindle assemblies is a power-driven system, places between the forward and backward hydrostatic bearing, and driving main shaft 2 is rotated and worked, and main shaft is to be connected with the rotor of electric spindle assemblies through cooperating, and its output shaft is exactly a main shaft.Adopt this big specification precision directly to drive main shaft, simple in structure, rationally distributed, job stability and good reliability, precision is high, can make hydrodynamic and hydrostatic pressure bearing, accurate direct-drive type spindle unit that main axle structure is bigger.
Motor is loaded on the direct-drive type structure between the forward and backward hydrostatic bearing; During the motor driven main axis rotation; Because do not had the external force effect of middle transmission link, main shaft does not bear radial drive power, only bears axial turning moment; The main shaft high-speed cruising does not have middle transmission to impact and balance more, and the processing parts precision is higher.
Fig. 3 is a hermetic seal structure diagram of the present invention.Among Fig. 3, sealing gas gets into from main shaft casing air inlet, through structures such as corresponding gas circuit and sealing rings, has realized the effective isolation between hydrostatic bearing hydraulic oil and inner electric machine and the cooling fluid.
Claims (5)
1. one kind big specification precision is directly driven main axle structure, it is characterized in that hydrodynamic and hydrostatic pressure structure and electric main shaft be combined as a whole constituting precision and directly driving main shaft.
2. big specification precision according to claim 1 is directly driven main axle structure, it is characterized in that comprising main shaft casing (1), main shaft (2), preceding hydrostatic bearing (3), rear bearing block (4), back hydrostatic bearing (5), motor rotor (6), motor stator (9); Preceding hydrostatic bearing (3) outer ring cooperates with the hole of main shaft casing (1), and its internal diameter cooperates with main shaft (2) external diameter; Back hydrostatic bearing (5) outer ring cooperates with rear bearing block (4) endoporus, and its internal diameter cooperates with main shaft (2) external diameter; Motor rotor (6), motor stator (9) are loaded between the forward and backward hydrostatic bearing; Be shaped on the main shaft casing (1) forward and backward hydrostatic bearing into and out of hydraulic fluid port and main shaft cooling fluid liquid inlet and outlet.
3. big specification precision according to claim 1 and 2 is directly driven main axle structure, it is characterized in that between preceding hydrostatic bearing (3) and main shaft (2), being provided with making main shaft in bearing radial force, can bear the thrust ring (7) of axial force.
4. big specification precision according to claim 3 is directly driven main axle structure, it is characterized in that preceding hydrostatic bearing (3), rear bearing block (4) and back hydrostatic bearing (5) are monolithic construction, and said bearing and casing are for being rigidly connected.Make main shaft can bear big radial load and axial force simultaneously.
5. big specification precision according to claim 4 is directly driven main shaft, it is characterized in that: adopt hermetic seal to realize the effective isolation between hydrostatic bearing hydraulic oil and inner electric machine and the cooling fluid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102828111A CN102335755A (en) | 2011-09-22 | 2011-09-22 | Large-sized precise direct-driving main shaft structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102828111A CN102335755A (en) | 2011-09-22 | 2011-09-22 | Large-sized precise direct-driving main shaft structure |
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| CN102335755A true CN102335755A (en) | 2012-02-01 |
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| CN2011102828111A Pending CN102335755A (en) | 2011-09-22 | 2011-09-22 | Large-sized precise direct-driving main shaft structure |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102777495A (en) * | 2012-07-24 | 2012-11-14 | 太原科技大学 | Static-dynamic pressure oil film bearing with thrust function |
| CN103394711A (en) * | 2013-07-24 | 2013-11-20 | 宝鸡忠诚机床股份有限公司 | Large-size precise direct-drive spindle structure of numerical-control lathe |
| CN107838694A (en) * | 2017-11-28 | 2018-03-27 | 普瑞森（安阳）机械有限公司 | A kind of quiet dynamic pressure directly turns platform |
| CN107838443A (en) * | 2017-12-24 | 2018-03-27 | 芜湖洪金机床有限公司 | High precision overloading directly drives the manufacture method of dividing head spindle |
| CN108067640A (en) * | 2017-12-24 | 2018-05-25 | 芜湖洪金机床有限公司 | A kind of high precision overloading directly drives the sealing structure of dividing head spindle |
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| CN1621703A (en) * | 2003-11-28 | 2005-06-01 | 广东工业大学 | Machine tool electric main shaft realizing supporting float by adopting hydrostatic bearing |
| CN2765372Y (en) * | 2004-12-08 | 2006-03-15 | 湖南同心科技有限公司 | Dynamic/static pressure bearing electric main shaft |
| CN101060262A (en) * | 2007-05-31 | 2007-10-24 | 熊万里 | Built-in type hybrid motor spindle |
| CN201303269Y (en) * | 2008-10-13 | 2009-09-02 | 赵松辰 | Full-enclosed oil mist/oil gas recovery device for electric spindle |
| CN101564770A (en) * | 2009-05-15 | 2009-10-28 | 西安交通大学 | High-speed electric main shaft device for lubricating hydrodynamic and hydrostatic bearings by adopting water |
| CN201394746Y (en) * | 2009-09-03 | 2010-02-03 | 洛阳市洛凌轴承科技股份有限公司 | Electric main shaft structure running at high precision |
| CN201863122U (en) * | 2010-07-28 | 2011-06-15 | 重庆恒博机械制造有限公司 | Grinding head for static pressure electric main shaft |
-
2011
- 2011-09-22 CN CN2011102828111A patent/CN102335755A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1621703A (en) * | 2003-11-28 | 2005-06-01 | 广东工业大学 | Machine tool electric main shaft realizing supporting float by adopting hydrostatic bearing |
| CN2765372Y (en) * | 2004-12-08 | 2006-03-15 | 湖南同心科技有限公司 | Dynamic/static pressure bearing electric main shaft |
| CN101060262A (en) * | 2007-05-31 | 2007-10-24 | 熊万里 | Built-in type hybrid motor spindle |
| CN201303269Y (en) * | 2008-10-13 | 2009-09-02 | 赵松辰 | Full-enclosed oil mist/oil gas recovery device for electric spindle |
| CN101564770A (en) * | 2009-05-15 | 2009-10-28 | 西安交通大学 | High-speed electric main shaft device for lubricating hydrodynamic and hydrostatic bearings by adopting water |
| CN201394746Y (en) * | 2009-09-03 | 2010-02-03 | 洛阳市洛凌轴承科技股份有限公司 | Electric main shaft structure running at high precision |
| CN201863122U (en) * | 2010-07-28 | 2011-06-15 | 重庆恒博机械制造有限公司 | Grinding head for static pressure electric main shaft |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102777495A (en) * | 2012-07-24 | 2012-11-14 | 太原科技大学 | Static-dynamic pressure oil film bearing with thrust function |
| CN103394711A (en) * | 2013-07-24 | 2013-11-20 | 宝鸡忠诚机床股份有限公司 | Large-size precise direct-drive spindle structure of numerical-control lathe |
| CN107838694A (en) * | 2017-11-28 | 2018-03-27 | 普瑞森（安阳）机械有限公司 | A kind of quiet dynamic pressure directly turns platform |
| CN107838694B (en) * | 2017-11-28 | 2019-07-02 | 普瑞森（安阳）机械有限公司 | A kind of quiet dynamic pressure directly turns platform |
| CN107838443A (en) * | 2017-12-24 | 2018-03-27 | 芜湖洪金机床有限公司 | High precision overloading directly drives the manufacture method of dividing head spindle |
| CN108067640A (en) * | 2017-12-24 | 2018-05-25 | 芜湖洪金机床有限公司 | A kind of high precision overloading directly drives the sealing structure of dividing head spindle |
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Application publication date: 20120201 |