CN111775046A - Workpiece spindle and grinding machine tool - Google Patents
Workpiece spindle and grinding machine tool Download PDFInfo
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- CN111775046A CN111775046A CN202010572173.6A CN202010572173A CN111775046A CN 111775046 A CN111775046 A CN 111775046A CN 202010572173 A CN202010572173 A CN 202010572173A CN 111775046 A CN111775046 A CN 111775046A
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- spindle
- sleeve
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- hydrostatic bearing
- shaft core
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/04—Headstocks; Working-spindles; Features relating thereto
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Abstract
The invention discloses a workpiece spindle and a grinding machine tool, the workpiece spindle includes: a spindle jacket; the shaft core is positioned in the main shaft outer sleeve and supported by the hydrostatic bearing, and is provided with a shaft core inner hole; the hydraulic clamping device comprises an expansion sleeve, the expansion sleeve is arranged in an inner hole of a shaft core and is directly or indirectly connected with the shaft core, and the expansion sleeve elastically deforms through hydraulic oil to clamp a workpiece; and the motor assembly is used for driving the shaft core to rotate. The grinding machine tool comprises the workpiece spindle. By adopting a hydrostatic pressure type supporting structure, the rotation precision of the workpiece spindle is high, and the radial rigidity and the axial rigidity are improved; the damping of a liquid medium oil film between the shaft core and the hydrostatic bearing is large, so that the vibration of the workpiece shaft in the machining process is reduced, and the rotation stability of the workpiece shaft is improved; the hydraulic clamping device is used for clamping a workpiece by using an expansion sleeve elastic deformation principle, has the advantages of stable and reliable clamping, high positioning precision, convenience in operation and the like, and can meet the machining requirements of precision and ultra-precision grinding.
Description
Technical Field
The invention is used in the field of machining, and particularly relates to a workpiece spindle and a grinding machine tool.
Background
A grinding machine is a machine tool that grinds the surface of a workpiece using a grinding tool. At present, for precise and ultra-precise internal grinding processing, single-side grinding is generally adopted, when two ends of a workpiece need to be ground, turning and clamping are needed, and the coaxiality of internal circles at two ends is poor. Particularly, for a machine body or a sleeve type longer workpiece, the machining precision is difficult to meet the requirement of ultraprecision due to the turning machining.
The workpiece spindle of the existing grinding machine has positioning precision, rotation precision, radial rigidity and axial rigidity which can not meet the processing requirements of precision and ultra-precision grinding.
Disclosure of Invention
The invention aims to solve at least one of the technical problems in the prior art, and provides a workpiece spindle and a grinding machine tool, wherein the workpiece spindle has higher positioning precision, rotation precision, radial rigidity and axial rigidity, and can meet the processing requirements of precision and ultra-precision grinding.
The technical scheme adopted by the invention for solving the technical problems is as follows:
in a first aspect, a workpiece spindle comprises:
a spindle jacket;
the shaft core is positioned in the main shaft outer sleeve and supported by the hydrostatic bearing, and is provided with a shaft core inner hole;
the hydraulic clamping device comprises an expansion sleeve, the expansion sleeve is arranged in an inner hole of the shaft core and is directly or indirectly connected with the shaft core, and the expansion sleeve elastically deforms through hydraulic oil to clamp a workpiece;
and the motor assembly is used for driving the shaft core to rotate.
In combination with the first aspect, in certain implementation manners of the first aspect, the hydraulic clamping device further includes a clamping sleeve, the clamping sleeve is disposed in the inner hole of the shaft core, the clamping sleeve is detachably connected with the shaft core, the expansion sleeve is disposed inside the clamping sleeve, an annular oil groove is disposed on the outer surface of the expansion sleeve, a hydraulic cavity is defined between the annular oil groove and the inner wall of the clamping sleeve, and the expansion sleeve is capable of causing elastic deformation to clamp the workpiece through hydraulic oil in the hydraulic cavity.
With reference to the first aspect and the foregoing implementation manners, in certain implementation manners of the first aspect, the clamping sleeve is provided with a pressure regulating hole, and the pressure regulating hole is communicated with the hydraulic cavity through a hydraulic oil channel, and further includes:
and the pressure regulating assembly is connected with the pressure regulating hole and used for regulating the pressure of the hydraulic oil in the hydraulic cavity.
With reference to the first aspect and the foregoing implementation manners, in certain implementation manners of the first aspect, the annular oil groove includes a first annular oil groove and a second annular oil groove, the first annular oil groove and the second annular oil groove are located at two ends of the expansion sleeve, a first clamping surface is arranged on an inner surface of the expansion sleeve at a position corresponding to the first annular oil groove, and a second clamping surface is arranged on an inner surface of the expansion sleeve at a position corresponding to the second annular oil groove.
With reference to the first aspect and the foregoing implementation manners, in some implementation manners of the first aspect, the hydrostatic bearing further includes a bearing sleeve, the hydrostatic bearing includes a first hydrostatic bearing and a second hydrostatic bearing, the first hydrostatic bearing and the second hydrostatic bearing are located inside the bearing sleeve, one end of the bearing sleeve is located outside the first hydrostatic bearing and is connected to a first end cover, and a first framework oil seal is disposed between the first end cover and the first hydrostatic bearing; the other end of the bearing sleeve is connected with a second end cover at the outer side of the second hydrostatic bearing, the second end cover is provided with a second framework oil seal between the second hydrostatic bearing, the bearing sleeve, the first end cover, the first framework oil seal, the first hydrostatic bearing, the second framework oil seal and the second end cover form a hydrostatic bearing assembly, the hydrostatic bearing assembly is arranged inside the spindle sleeve, and the bearing sleeve is arranged inside the first hydrostatic bearing and the second hydrostatic bearing to form an oil return cavity.
With reference to the first aspect and the foregoing implementation manners, in certain implementation manners of the first aspect, the motor assembly is disposed inside the spindle housing, and the motor assembly includes:
the stator is connected with the spindle sleeve;
and the rotor is connected with the shaft core.
With reference to the first aspect and the foregoing implementation manners, in some implementation manners of the first aspect, the optical grating further includes a grating assembly, where the grating assembly includes:
the grating rotates synchronously with the shaft core;
and the reading head is connected with the spindle sleeve and is used for being matched with the grating.
In a second aspect, a grinding machine comprises the workpiece spindle of any one of the implementations of the first aspect.
With reference to the second aspect, in some implementations of the second aspect, the method further includes:
a first guide rail disposed in a first direction;
a second guide rail arranged along a second direction;
the grinding wheel electric spindle comprises a first grinding wheel electric spindle and a second grinding wheel electric spindle, and the first grinding wheel electric spindle and the second grinding wheel electric spindle are positioned on two sides of the workpiece spindle;
the driving mechanism comprises a first driving mechanism, a second driving mechanism and a third driving mechanism, the first driving mechanism is used for driving the first grinding wheel electric spindle to move along a first guide rail, the second driving mechanism is used for driving the second grinding wheel electric spindle to move along the first guide rail, and the third driving mechanism is used for driving the workpiece spindle to move along the second guide rail.
With reference to the second aspect and the foregoing implementation manners, in some implementation manners of the second aspect, the first guide rail and the second guide rail are both hydrostatic guide rails, and the first grinding wheel electric spindle and the second grinding wheel electric spindle are both hydrostatic grinding wheel electric spindles.
One of the above technical solutions has at least one of the following advantages or beneficial effects: the workpiece spindle adopts a hydrostatic pressure type supporting structure, so that the workpiece spindle has high rotation precision and improved radial rigidity and axial rigidity; the damping of a liquid medium oil film between the shaft core and the hydrostatic bearing is large, so that the vibration of the workpiece shaft in the machining process is reduced, the rotation stability of the workpiece shaft is improved, and the surface contour machining precision and the surface quality of the workpiece are improved; the workpiece spindle is provided with the hydraulic clamping device, the workpiece is clamped by applying the expansion sleeve elastic deformation principle in the hydraulic clamping device, the clamping device has the advantages of being stable and reliable in clamping, high in positioning precision, convenient to operate and the like, and the machining requirements of precision and ultra-precision grinding can be met.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a structural cross-sectional view of one embodiment of a workpiece spindle of the present invention;
fig. 2 is a schematic structural diagram of one embodiment of the grinding machine tool of the invention.
Detailed Description
Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.
In the present invention, if directions (up, down, left, right, front, and rear) are described, it is only for convenience of describing the technical solution of the present invention, and it is not intended or implied that the technical features referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, it is not to be construed as limiting the present invention.
In the invention, the meaning of "a plurality" is one or more, the meaning of "a plurality" is more than two, and the terms of "more than", "less than", "more than" and the like are understood to exclude the number; the terms "above", "below", "within" and the like are understood to include the instant numbers. In the description of the present invention, if there is description of "first" and "second" only for the purpose of distinguishing technical features, it is not to be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the precedence of the indicated technical features.
In the present invention, unless otherwise specifically limited, the terms "disposed," "mounted," "connected," and the like are to be understood in a broad sense, and for example, may be directly connected or indirectly connected through an intermediate; can be fixedly connected, can also be detachably connected and can also be integrally formed; may be mechanically coupled, may be electrically coupled or may be capable of communicating with each other; either as communication within the two elements or as an interactive relationship of the two elements. The specific meaning of the above-mentioned words in the present invention can be reasonably determined by those skilled in the art in combination with the detailed contents of the technical solutions.
Referring to fig. 1, an embodiment of the present invention provides a workpiece spindle 2, the workpiece spindle 2 being used for machine tool machining such as milling, grinding and the like, the workpiece spindle 2 comprising a spindle housing 2-6, a spindle core 2-1, hydraulic clamping means and motor assemblies 2-12, 2-13. Wherein, the main shaft outer sleeve 2-6 is used as a supporting and protecting structure of the workpiece main shaft 2 and is in a sleeve shape. The shaft core 2-1 is positioned inside the main shaft jacket 2-6 and is supported by hydrostatic bearings 2-4, 2-9. The shaft core 2-1 is provided with a shaft core inner hole, the hydraulic clamping device comprises an expansion sleeve 2-19, the expansion sleeve 2-19 is arranged in the shaft core inner hole, the expansion sleeve 2-19 is directly or indirectly connected with the shaft core 2-1, and the expansion sleeve 2-19 causes elastic deformation through hydraulic oil to realize workpiece clamping.
When the workpiece spindle 2 works, the spindle core 2-1 rotates in the spindle outer sleeve 2-6 under the drive of the motor components 2-12 and 2-13 and is supported by the hydrostatic bearings 2-4 and 2-9, and a workpiece is clamped by the hydraulic clamping device and rotates along with the spindle core 2-1. The workpiece spindle 2 adopts a hydrostatic pressure type supporting structure, so that the workpiece spindle 2 has high rotation precision and improved radial rigidity and axial rigidity; the damping of a liquid medium oil film between the shaft core 2-1 and the hydrostatic bearings 2-4 and 2-9 is large, so that the vibration of a workpiece shaft in the machining process is reduced, the rotation stability of the workpiece shaft is improved, and the surface contour machining precision and the surface quality of the workpiece are improved; the workpiece spindle 2 is provided with a hydraulic clamping device, the workpiece is clamped by the hydraulic clamping device by applying the elastic deformation principle of the expansion sleeve 2-19, the clamping device has the advantages of stability and reliability in clamping, high positioning precision, convenience in operation and the like, and the machining requirements of precision and ultra-precision grinding can be met.
In some embodiments, referring to fig. 1, the hydraulic clamping device further comprises a clamping sleeve 2-17, the clamping sleeve 2-17 is arranged in an inner hole of the shaft core, the clamping sleeve 2-17 is fixedly connected with the shaft core 2-1, the expansion sleeve 2-19 is arranged inside the clamping sleeve 2-17, annular oil grooves 2-23 and 2-24 are formed in the outer surface of the expansion sleeve 2-19, a hydraulic cavity is defined between the annular oil grooves 2-23 and 2-24 and the inner wall of the clamping sleeve 2-17, and the expansion sleeve 2-19 is elastically deformed by hydraulic oil in the hydraulic cavity to clamp the workpiece. The annular oil grooves 2-23 and 2-24 can ensure that the expansion sleeves 2-19 can uniformly expand or contract along the radial direction under the action of hydraulic oil, and the clamping precision of the workpiece is higher.
Wherein the clamping sleeve 2-17 is detachably connected with the shaft core 2-1, for example, connected with the shaft core 2-1 by means of a buckle, a bolt and the like. The clamping sleeves 2-17 and the expansion sleeves 2-19 form a hydraulic clamping device which can be integrally assembled and disassembled in the inner hole of the shaft core, the hydraulic clamping device with the corresponding size can be selected according to the outer diameter of a clamped workpiece, and the range of processing the workpiece is wider.
Referring to fig. 1, the clamping sleeve 2-17 is provided with pressure regulating holes, the pressure regulating holes are communicated with the hydraulic cavity through hydraulic oil channels 2-25, the hydraulic oil channels 2-25 are formed by directly drilling holes in the clamping sleeve 2-17, the hydraulic oil channels 2-25 comprise axial oil holes and radial oil holes, openings formed in the end face of the clamping sleeve 2-17 by the axial oil holes are sealed through plugs 2-18, and the radial oil holes communicate the axial oil holes with the hydraulic cavity.
Referring to fig. 1, the hydraulic clamping device further includes a pressure regulating assembly, and the pressure regulating assembly is connected to the pressure regulating hole and used for regulating the pressure of the hydraulic oil in the hydraulic cavity. The pressure regulating assembly comprises a movable oil plug 2-20, an oil plug head 2-21 and a flat end fastening screw 2-22, the flat end fastening screw 2-22 pushes the oil plug head 2-21 to move, the oil plug head 2-21 pushes the movable oil plug 2-20 to move, the movable oil plug 2-20 compresses hydraulic oil in the hydraulic cavity, the pressure of the hydraulic oil is increased, when the flat end fastening screw 2-22 is reversely applied with torque, the hydraulic oil with higher pressure can apply thrust to the movable oil plug 2-20, the movable oil plug 2-20 and the oil plug head 2-21 move, and accordingly pressure of the hydraulic oil is regulated.
It can be understood that the hydraulic clamping device can also omit the clamping sleeves 2-17, namely the expansion sleeves 2-19 are directly matched with the inner hole of the shaft core and form a hydraulic cavity, and the embodiment can omit the clamping sleeves 2-17 and has simpler structure.
One or more annular oil grooves 2-23, 2-24 may be provided, for example, in the embodiment shown in fig. 1, the annular oil grooves 2-23, 2-24 include a first annular oil groove 2-23 and a second annular oil groove 2-24, the first annular oil groove 2-23 and the second annular oil groove 2-24 are located at two ends of the expansion sleeve 2-19, and the expansion sleeve 2-19 forms a double hydraulic chamber through the first annular oil groove 2-23 and the second annular oil groove 2-24, so as to generate a two-point clamping effect, avoid unstable deflection caused by the middle position bulging when a single hydraulic chamber is clamped, and enable clamping accuracy to be more stable and shock absorption effect to be better.
Further, referring to fig. 1, the inner surface of the expander sleeve 2-19 is provided with a first clamping surface 2-26 at a position corresponding to the first annular oil groove 2-23, and the inner surface of the expander sleeve 2-19 is provided with a second clamping surface 2-27 at a position corresponding to the second annular oil groove 2-24. The first clamping surface 2-26 and the second clamping surface 2-27 are continuous or discontinuous arc surfaces, the inner surface of the expansion sleeve 2-19 is used for directly contacting with a workpiece at the first clamping surface 2-26 and the second clamping surface 2-27 to realize clamping, and the first clamping surface 2-26 and the second clamping surface 2-27 need high-precision machining. The inner surface of the expansion sleeve 2-19 has a larger inner diameter at the part between the first clamping surface 2-26 and the second clamping surface 2-27, and does not contact with the workpiece in the process of clamping the workpiece, so the part between the first clamping surface 2-26 and the second clamping surface 2-27 can be not used for finish machining. Therefore, the difficulty in processing the inner holes of the expansion sleeves 2-19 is greatly reduced.
Referring to fig. 1, in some embodiments, the workpiece spindle 2 further comprises a bearing sleeve 2-5, and the hydrostatic bearings 2-4, 2-9 comprise a first hydrostatic bearing 2-4 and a second hydrostatic bearing 2-9, the first hydrostatic bearing 2-4 and the second hydrostatic bearing 2-9 being aligned in the axial direction of the core 2-1. The first hydrostatic bearing 2-4 and the second hydrostatic bearing 2-9 are located inside a bearing sleeve 2-5, one end of the bearing sleeve 2-5 is connected with a first end cover 2-2 at the outer side of the first hydrostatic bearing 2-4, and the sealing is in contact type, namely a first framework oil seal 2-3 is arranged between the first end cover 2-2 and the first hydrostatic bearing 2-4. The other end of the bearing sleeve 2-5 is connected with a second end cover 2-10 at the outer side of a second hydrostatic bearing 2-9, the sealing adopts contact type sealing, namely a second framework oil seal 2-11 is arranged between the second end cover 2-10 and the second hydrostatic bearing 2-9, the bearing sleeve 2-5, the first end cover 2-2, the first framework oil seal 2-3, the first hydrostatic bearing 2-4, the second hydrostatic bearing 2-9, the second framework oil seal 2-11 and the second end cover 2-10 form hydrostatic pressure, and the hydrostatic bearing assembly is arranged in a main shaft bearing assembly housing 2-6.
The first hydrostatic bearing 2-4 and the second hydrostatic bearing 2-9 provide double bearing support for the shaft core, and the rotation precision of the shaft core 2-1 is higher. Specifically, an oil inlet pipe 2-8 is arranged on the main shaft outer sleeve 2-6, the oil inlet pipe 2-8 is connected with a first hydrostatic bearing 2-4 and a second hydrostatic bearing 2-9, an oil return cavity is formed between the first hydrostatic bearing 2-4 and the second hydrostatic bearing 2-9 inside the bearing sleeve 2-5, and an oil return pipe 2-7 is arranged on the main shaft outer sleeve 2-6. Hydraulic oil enters the space between the hydrostatic bearings 2-4 and 2-9 and the shaft core 2-1 through the oil inlet pipes 2-8, the hydraulic oil provides lubrication and support for the shaft core to form a hydrostatic support structure, then flows into the oil return cavity, and finally flows back through the oil return pipes 2-7 to perform the next circulation.
The motor assembly may be independent of the workpiece spindle 2 or may be integrated with the workpiece spindle 2, for example in the embodiment shown in fig. 1, the motor assembly is arranged inside the spindle housing 2-6 and behind the hydrostatic bearing assembly, the outside of which is sealed by means of an air sealing cover 2-16, ensuring that no oil, oil mist or impurities enter. The motor component comprises a stator 2-12 and a rotor 2-13, wherein the stator 2-12 is fixedly connected with the spindle outer sleeve 2-6, and the rotor 2-13 is connected with the spindle core 2-1. The motor component drives the shaft core 2-1 to realize the rotation of the shaft core 2-1. In the embodiment, the motor assembly is combined with the workpiece spindle 2, so that the structure is simpler and more compact, and the efficiency and the precision of the motor are higher.
In some embodiments, referring to FIG. 1, the workpiece spindle 2 further comprises a grating assembly comprising a grating 2-15 and a read head, the grating 2-15 rotating synchronously with the spindle core 2-1, the read head being fixed to a read head mount 2-14, the read head mount 2-14 being further connected to the spindle housing 2-6 for cooperation with the grating 2-15. The grating component can realize the processing of non-circular products in a numerical control machine tool by measuring and feeding back the fillet displacement of the shaft core 2-1, thereby enlarging the processing range of workpieces.
An embodiment of the invention provides a grinding machine comprising a workpiece spindle 2 of any of the above embodiments. The grinding machine tool can be single-side grinding or double-side grinding, and a workpiece spindle 2 of the grinding machine tool adopts a hydrostatic pressure type supporting structure, so that the workpiece spindle 2 has high rotation precision and improved radial rigidity and axial rigidity; the damping of a liquid medium oil film between the shaft core 2-1 and the hydrostatic bearings 2-4 and 2-9 is large, so that the vibration of a workpiece shaft in the machining process is reduced, the rotation stability of the workpiece shaft is improved, and the surface contour machining precision and the surface quality of the workpiece are improved; the workpiece spindle 2 is provided with a hydraulic clamping device, the workpiece is clamped by the hydraulic clamping device by applying the elastic deformation principle of the expansion sleeve 2-19, the clamping device has the advantages of stability and reliability in clamping, high positioning precision, convenience in operation and the like, and the machining requirements of precision and ultra-precision grinding can be met.
In some embodiments, referring to fig. 2, the grinding machine further comprises a first guide 6, a second guide 10, a grinding wheel spindle, and a drive mechanism, the first guide 6 being disposed in a first direction, the second guide 10 being disposed in a second direction, the first guide 6 and the second guide 10 being at an angle to one another, such as, but not limited to, 90 °. The grinding wheel electric spindle comprises a first grinding wheel electric spindle 3 and a second grinding wheel electric spindle 9, and the first grinding wheel electric spindle 3 and the second grinding wheel electric spindle 9 are located on two sides of the workpiece spindle 2.
The driving mechanism comprises a first driving mechanism 5, a second driving mechanism 8 and a third driving mechanism 11, the first driving mechanism 5 is used for driving the first grinding wheel electric spindle 3 to move along the first guide rail 6, the second driving mechanism 8 is used for driving the second grinding wheel electric spindle 9 to move along the first guide rail 6, and the third driving mechanism 11 is used for driving the workpiece spindle 2 to move along the second guide rail 10.
Two ends of the workpiece spindle 2 are respectively provided with a grinding wheel electric spindle, so that grinding of two ends or inner holes of the machine body or the sleeve part can be completed by one-time clamping, the grinding coaxiality, the cylindricity and the perpendicularity of two end faces of the workpiece are improved, and the problem of poor precision of the grinding coaxiality and the cylindricity of the inner circle of the machine body or the sleeve part is solved; and the inner holes at two ends of the workpiece are simultaneously ground, so that the machining efficiency can be greatly improved, and the machining cost is saved.
Further, the first guide rail 6 and the second guide rail 10 are both hydrostatic guide rails, the first grinding wheel electric spindle 3 is mounted on the first sliding block 4, the second grinding wheel electric spindle 9 is mounted on the second sliding block 7, and the first sliding block 4 and the second sliding block 7 are both arranged on the first guide rail 6. The axial movement of the first grinding wheel electric spindle 3 is driven by the first driving mechanism 5, the axial movement of the second grinding wheel electric spindle 9 is driven by the second driving mechanism 8, and the two grinding wheel electric spindles are arranged on the same hydrostatic guide rail together, so that the coaxiality of the two grinding wheel electric spindles can be ensured. The workpiece spindle 2 is mounted on the casting machine base 1, the machine base 1 is mounted on the second guide rail 10 through a third sliding block, and the movement of the workpiece spindle 2 is driven through a third driving mechanism 11. The first grinding wheel electric spindle 3 and the second grinding wheel electric spindle 9 are both hydrostatic grinding wheel electric spindles. The driving mechanism can adopt a motor, a cylinder, a linear motor and the like.
During grinding, the workpiece spindle 2 clamps a box or sleeve part through a hydraulic clamping device, and is driven by the third driving mechanism 11 to enable the central line of the workpiece to move to be collinear with the central line of the grinding wheel spindle; after the first grinding wheel electric spindle 3 and the second grinding wheel electric spindle 9 are aligned, axial displacement adjustment is carried out on the first guide rail 6 through the first driving mechanism 5 and the second driving mechanism 8 respectively; and after the adjustment is finished, the left hydrostatic pressure grinding wheel electric spindle and the right hydrostatic pressure grinding wheel electric spindle simultaneously grind and process two ends of the workpiece.
The grinding system adopts a full hydrostatic pressure type supporting structure, the workpiece spindle 2, the grinding wheel shafts at two ends and the guide rail are supported by hydrostatic pressure, the grinding system has ultrahigh rotation precision, the hydrostatic guide rail can guarantee the precision feeding of the workpiece and the grinding wheel shafts, the creeping is avoided, and the grinding system provides the advantages of high precision, high reliability, no abrasion, long service life and the like for machine tool machining.
The ultra-precise double-head internal grinding system can realize high-efficiency and high-precision positioning and clamping and high reliability of the workpiece spindle 2, and can be used for machining precise and ultra-precise workpieces.
In the description herein, references to the description of the term "example," "an embodiment," or "some embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The invention is not limited to the above embodiments, and those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the invention, and such equivalent modifications or substitutions are included in the scope of the claims of the present application.
Claims (10)
1. A workpiece spindle, comprising:
a spindle jacket;
the shaft core is positioned in the main shaft outer sleeve and supported by the hydrostatic bearing, and is provided with a shaft core inner hole;
the hydraulic clamping device comprises an expansion sleeve, the expansion sleeve is arranged in an inner hole of the shaft core and is directly or indirectly connected with the shaft core, and the expansion sleeve elastically deforms through hydraulic oil to clamp a workpiece;
and the motor assembly is used for driving the shaft core to rotate.
2. The workpiece spindle of claim 1, wherein the hydraulic clamping device further comprises a clamping sleeve, the clamping sleeve is disposed in the inner hole of the spindle core, the clamping sleeve is detachably connected with the spindle core, the expansion sleeve is disposed inside the clamping sleeve, an annular oil groove is disposed on an outer surface of the expansion sleeve, a hydraulic cavity is defined between the annular oil groove and an inner wall of the clamping sleeve, and the expansion sleeve is elastically deformed by hydraulic oil in the hydraulic cavity to clamp the workpiece.
3. The workpiece spindle of claim 2, wherein the clamping sleeve is provided with a pressure regulating hole, the pressure regulating hole is communicated with the hydraulic cavity through a hydraulic oil passage, and further comprising:
and the pressure regulating assembly is connected with the pressure regulating hole and used for regulating the pressure of the hydraulic oil in the hydraulic cavity.
4. The workpiece spindle according to claim 2 or 3, wherein the annular oil grooves comprise a first annular oil groove and a second annular oil groove, the first annular oil groove and the second annular oil groove are located at two ends of the expansion sleeve, the inner surface of the expansion sleeve is provided with a first clamping surface at a position corresponding to the first annular oil groove, and the inner surface of the expansion sleeve is provided with a second clamping surface at a position corresponding to the second annular oil groove.
5. The workpiece spindle of claim 1, further comprising a bearing sleeve, wherein the hydrostatic bearing comprises a first hydrostatic bearing and a second hydrostatic bearing, the first hydrostatic bearing and the second hydrostatic bearing are located inside the bearing sleeve, one end of the bearing sleeve is located outside the first hydrostatic bearing and is connected with a first end cover, and a first framework oil seal is arranged between the first end cover and the first hydrostatic bearing; the other end of the bearing sleeve is connected with a second end cover at the outer side of the second hydrostatic bearing, the second end cover is provided with a second framework oil seal between the second hydrostatic bearing, the bearing sleeve, the first end cover, the first framework oil seal, the first hydrostatic bearing, the second framework oil seal and the second end cover form a hydrostatic bearing assembly, the hydrostatic bearing assembly is arranged inside the spindle sleeve, and the bearing sleeve is arranged inside the first hydrostatic bearing and the second hydrostatic bearing to form an oil return cavity.
6. The workpiece spindle of claim 1, wherein said motor assembly is disposed within said spindle housing, said motor assembly comprising:
the stator is connected with the spindle sleeve;
and the rotor is connected with the shaft core.
7. The workpiece spindle of claim 6, further comprising a grating assembly, the grating assembly comprising:
the grating rotates synchronously with the shaft core;
and the reading head is connected with the spindle sleeve and is used for being matched with the grating.
8. A grinding machine comprising the workpiece spindle according to any one of claims 1 to 7.
9. The grinding machine of claim 8, further comprising:
a first guide rail disposed in a first direction;
a second guide rail arranged along a second direction;
the grinding wheel electric spindle comprises a first grinding wheel electric spindle and a second grinding wheel electric spindle, and the first grinding wheel electric spindle and the second grinding wheel electric spindle are positioned on two sides of the workpiece spindle;
the driving mechanism comprises a first driving mechanism, a second driving mechanism and a third driving mechanism, the first driving mechanism is used for driving the first grinding wheel electric spindle to move along a first guide rail, the second driving mechanism is used for driving the second grinding wheel electric spindle to move along the first guide rail, and the third driving mechanism is used for driving the workpiece spindle to move along the second guide rail.
10. The grinding machine of claim 9 wherein said first and second rails are hydrostatic rails and said first and second wheel motorized spindles are hydrostatic wheel motorized spindles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010572173.6A CN111775046A (en) | 2020-06-22 | 2020-06-22 | Workpiece spindle and grinding machine tool |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010572173.6A CN111775046A (en) | 2020-06-22 | 2020-06-22 | Workpiece spindle and grinding machine tool |
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| CN111775046A true CN111775046A (en) | 2020-10-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112453969A (en) * | 2020-11-09 | 2021-03-09 | 上海屹亚精工机械有限公司 | Workpiece clamping device |
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Application publication date: 20201016 |