CN110976924B - Hydrostatic tailstock, hydrostatic tailstock system and machine tool - Google Patents
Hydrostatic tailstock, hydrostatic tailstock system and machine tool Download PDFInfo
- Publication number
- CN110976924B CN110976924B CN201911352884.6A CN201911352884A CN110976924B CN 110976924 B CN110976924 B CN 110976924B CN 201911352884 A CN201911352884 A CN 201911352884A CN 110976924 B CN110976924 B CN 110976924B
- Authority
- CN
- China
- Prior art keywords
- oil
- bearing
- hydrostatic
- tailstock
- cavity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B23/00—Tailstocks; Centres
Abstract
The invention discloses a hydrostatic tailstock, a hydrostatic tailstock system and a machine tool, wherein the hydrostatic tailstock comprises a centre assembly, a first shaft neck and a second shaft neck, wherein the centre assembly comprises a shaft core and a centre; the bearing comprises a first bearing and a second bearing, a first bearing oil cavity is arranged between the first bearing and a first journal, the first bearing oil cavity is provided with a first oil inlet channel and a first oil return channel, the second bearing is matched with the second journal, a second bearing oil cavity is arranged between the second bearing and the second journal, the second bearing oil cavity is provided with a second oil inlet channel and a second oil return channel, the first bearing oil cavity comprises a plurality of oil cavity clearance-adjustable first bearing oil distribution cavities, the plurality of first bearing oil distribution cavities are distributed along the circumferential direction of the first bearing, and the first oil inlet channel comprises a plurality of first oil inlet oil distribution channels connected with the first bearing oil distribution cavities. The center adjusting device can correct and position the inconsistency of the axis of the center, and has the advantages of high efficiency in centering and clamping, high adjusting precision and the like.
Description
Technical Field
The invention is used in the field of machining, and particularly relates to a hydrostatic tailstock, a hydrostatic tailstock system and a machine tool.
Background
The tailstock is one of important parts of the machine tool, and plays an important role in machining of the machine tool. The tailstock is often used for assisting in machining shaft parts with large axial sizes, the axial sizes of the parts are too large, and the shaft parts generate radial runout due to the existence of large radial cutting force and cannot be machined. When a part is machined by a machine tool, in order to improve the clamping reliability of the part, one end of the machined part is clamped by a main spindle box chuck, and the other end of the machined part is propped against by a tip of a tail frame.
The machining precision of the machine tool is directly influenced by the precision of a center hole of the tailstock and the precision of a center, and the center device is machining equipment which is commonly used in a workshop at present and used for positioning a workpiece. Need come the centre gripping work through the cooperation between jack catch and the top or two tops when pressing from both sides the dress work piece, and in the course of working, top centre of revolution often can produce the skew with lathe centre of revolution, need carry out axis centering adjustment to the top, the apical accurate swing of top can't be realized to the apical seat of most lathe, can adjust the base at most and increase top device to as for machining precision is low, inefficiency.
In addition, most of the existing machine tool tailstock centers produced in China are fixed dead centers, and when a workpiece is machined, a workpiece center hole and the tailstock center move relatively, so that relative friction between the workpiece center hole and the tailstock center reduces the quality of the center hole. The wear resistance of the center is poor, a center hole needs to be repaired, the center of the tailstock needs to be disassembled and assembled when the workpiece is disassembled and assembled, and the machining efficiency is low. When the parts are processed in a batch, the consistency of precision such as roundness of the parts is not good enough. When the center hole is worn, the center is worn, and the roundness precision of the dead center is not well maintained, so that the service life of the center is short.
Disclosure of Invention
The invention aims to at least solve one of the technical problems in the prior art, and provides a hydrostatic tailstock, a hydrostatic tailstock system and a machine tool, which can realize the swinging of a centre, correct and position the inconsistency of the axes of the centre, reduce the workload of matching the traditional machine tool tailstock device with a base and the like, and have the advantages of high efficiency, centering and clamping, high adjustment precision and the like.
The technical scheme adopted by the invention for solving the technical problems is as follows:
in a first aspect, a hydrostatic tailstock comprises
The center assembly comprises a shaft core and a center, the center is connected with the shaft core, and the shaft core is provided with a first shaft neck and a second shaft neck;
the bearing, including first bearing and second bearing, first bearing with the cooperation of first journal, first bearing with be equipped with first bearing oil pocket between the first journal, first bearing oil pocket has first oil feed passageway and first oil return passageway, the second bearing with the cooperation of second journal, the second bearing with be equipped with the second bearing oil pocket between the second journal, the second bearing oil pocket has second oil feed passageway and second oil return passageway, wherein, first bearing oil pocket includes a plurality of oil pocket clearance adjustable first bearing branch oil pocket, and is a plurality of first bearing divides the oil pocket to follow the circumference of first bearing distributes, first oil feed passageway include a plurality of with the first oil feed that first bearing divides the oil pocket to connect divides the passageway.
With reference to the first aspect, in certain implementations of the first aspect, the second bearing oil chamber includes a plurality of second bearing oil distribution chambers with adjustable oil chamber gaps, the plurality of second bearing oil distribution chambers are distributed along a circumferential direction of the second bearing, and the second oil inlet passage includes a plurality of second oil inlet oil distribution passages connected to the second bearing oil distribution chambers.
Combine first aspect and above-mentioned implementation, in some implementations of the first aspect, first bearing and second bearing have multiunit oil seal limit, every group the oil seal limit all includes two at least oil seal limits that set up along the axial, adjacent two be equipped with the oil return clearance between the oil seal limit, the multiunit the oil seal limit will first bearing oil pocket divide into a plurality ofly first bearing divides the oil pocket, the multiunit the oil seal limit will the second bearing oil pocket divide into a plurality ofly the second bearing divides the oil pocket.
With reference to the first aspect and the foregoing implementation manners, in some implementation manners of the first aspect, the method further includes
The oil storage tank comprises a tank body, wherein an oil storage cavity is formed in the tank body, and an oil return hole is formed in the bottom of the tank body;
the first bearing is positioned at the front end of the box body and connected with the box body, a front oil return groove is formed in the front of the first bearing oil cavity of the first bearing, and the first oil return channel comprises a front oil return pipeline communicated with the front oil return groove and the oil storage cavity; the second bearing is located the box rear end to with the box is connected, the second bearing in the rear of second bearing oil pocket is equipped with back oil gallery, the second oil return passageway is including the intercommunication back oil gallery with the back oil return pipe in oil storage chamber.
With reference to the first aspect and the foregoing implementation manners, in some implementation manners of the first aspect, a plurality of front oil return grooves are arranged along a front-rear direction, and a front oil seal cover is arranged between the first bearing and the first journal and in front of the front oil return grooves; the rear oil return grooves are arranged in a plurality of front and rear directions, and a rear oil seal cover is arranged between the second bearing and the second journal and behind the rear oil return grooves.
With reference to the first aspect and the foregoing implementation manners, in some implementation manners of the first aspect, the method further includes
The rear gland is connected with the box body or the second bearing, and an elastic supporting component is arranged between the rear gland and the shaft core;
wherein a shoulder is provided between the shaft core and the first and second bearings.
With reference to the first aspect and the foregoing implementation manners, in some implementation manners of the first aspect, the method further includes
The adjusting component is in threaded connection with the rear gland;
the rear end of the shaft core is provided with an axial hole, and the rolling ball is arranged in the axial hole and is in rolling fit with the shaft core;
wherein the elastic support member is supported between the rolling ball and the adjustment member.
In a second aspect, a hydrostatic tailstock system comprising
The hydrostatic tailstock according to any one of the implementations of the first aspect;
and the hydraulic pumps with adjustable flow are connected with the first bearing oil distribution chambers.
With reference to the second aspect, in certain implementations of the second aspect, the hydraulic pump includes a first hydraulic pump, a second hydraulic pump, and a third hydraulic pump, the first bearing oil distribution chamber includes an upper oil distribution chamber, a lower oil distribution chamber, a left oil distribution chamber, and a right oil distribution chamber, the first hydraulic pump is connected to the upper oil distribution chamber, the second hydraulic pump is connected to the left oil distribution chamber, and the third hydraulic pump is connected to the right oil distribution chamber and the lower oil distribution chamber.
In a third aspect, a machine tool comprises the hydrostatic tailstock system according to any one of the implementation manners of the second aspect.
One of the above technical solutions has at least one of the following advantages or beneficial effects:
1. the first bearing and the second bearing form a hydrostatic bearing, the shaft core and the bearings are not in contact wear, the center and the workpiece can synchronously rotate, the center head is not worn, the service life of the main shaft of the tailstock is long, the hydrostatic bearing is used as a support, the rotation precision is improved, and the hydrostatic bearing has the advantages of high precision, high reliability, no wear, long service life and the like;
2. during the use, can regulate and control through the oil pocket clearance to the first bearing branch oil pocket of first bearing for the axle core can carry out angular adjustment in joining in marriage axle clearance within range, thereby fine setting top every single move and the sidesway angle, revise the location to the top axis nonconformity, reduce the work load of high, joining in marriage the base of traditional lathe tailstock device configuration height, have advantages such as high efficiency centering clamping and adjustment accuracy height.
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 schematic diagram of the structure of one embodiment of a hydrostatic tailstock of the present invention;
FIG. 2 is a schematic diagram of the configuration of one embodiment of a hydrostatic tailstock system of the present invention;
FIG. 3 is a schematic structural diagram of an oil cavity angle φ 0, an oil cavity length L, an oil seal edge width a, and an oil seal edge width b.
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.
Fig. 1 and 2 show reference direction coordinate systems of embodiments of the present invention, and the embodiments of the present invention will be described below with reference to the directions shown in fig. 1 and 2.
The embodiment of the invention provides a hydrostatic tailstock which can be used for assisting in machining shaft parts with large axial dimensions, and referring to fig. 1, the hydrostatic tailstock comprises a tip assembly and a bearing, the tip assembly comprises a shaft core 1 and a tip 2, the tip 2 is connected with the shaft core 1, a hole of the tip 2 of a workpiece is matched with the tip 2 when the workpiece is machined, the tip 2 and the shaft core 1 synchronously rotate along with the workpiece, the tip 2 is free of abrasion, and the service life of a main shaft of the tailstock is long. Wherein the shaft core 1 has a first journal 11 and a second journal 12 for cooperation with a bearing.
Referring to fig. 1, the bearing includes a first bearing 3 and a second bearing 4, the first bearing 3 and the second bearing 4 are distributed along an axial direction, the first bearing 3 is matched with the first journal 11, a first bearing oil chamber 31 is arranged between the first bearing 3 and the first journal 11, the first bearing oil chamber 31 is provided with a first oil inlet channel and a first oil return channel, oil and other liquid media enter the first bearing oil chamber 31 through the first oil inlet channel and then flow out through the first oil return channel, and a contact position of the first journal 11 and the first bearing 3 is supported and suspended through a high-pressure oil film to form the hydrostatic bearing. The second bearing 4 is matched with the second journal 12, a second bearing oil cavity 41 is arranged between the second bearing 4 and the second journal 12, the second bearing oil cavity 41 is provided with a second oil inlet channel and a second oil return channel, liquid media such as oil enter the second bearing oil cavity 41 through the second oil inlet channel and then flow out through the second oil return channel, and the contact position of the second journal 12 and the second bearing 4 is supported and suspended through a high-pressure oil film to form the hydrostatic bearing. The hydrostatic bearing utilizes a liquid medium and the incompressible property thereof, can realize the effect of high-precision positioning and clamping, leads the shaft core 1 and the bearing not to be in contact wear, has long service life of the main shaft of the tailstock, adopts the hydrostatic bearing as a support, improves the rotation precision, and has the advantages of high precision, high reliability, no wear, long service life and the like.
Referring to fig. 2, the first bearing oil chamber 31 includes a plurality of first bearing oil-dividing chambers with adjustable oil chamber clearances, wherein the oil chamber clearances refer to the radial heights of the bearing oil chambers. The plurality of first bearing oil distribution chambers are distributed along the circumferential direction of the first bearing 3, and the first oil inlet channel comprises a plurality of first oil inlet oil distribution channels connected with the first bearing oil distribution chambers. During the use, can divide the oil feed volume that supplies in the oil pocket through the first bearing of regulation to first bearing 3, regulate and control the oil pocket clearance of oil pocket to the first bearing of first bearing 3, make axle core 1 can carry out angular adjustment in joining in marriage axle clearance within range, thereby finely tune top 2's every single move and side pendulum angle, 2 axis inconsistence correction location to the top, thereby can fix a position the processing to the work piece that the axis is unanimous, reduce traditional lathe tailstock device and join in marriage height, join in marriage the work load of base, have advantages such as high efficiency centering clamping and adjustment accuracy height.
For example, in the embodiment shown in fig. 2, the first bearing oil distribution cavity of the first bearing 3 is arranged along four directions, namely, the first bearing oil distribution cavity includes an upper oil distribution cavity 32, a lower oil distribution cavity 33, a left oil distribution cavity 34 and a right oil distribution cavity 35, the oil cavity clearance of the first bearing oil distribution cavity is regulated and controlled by regulating the size of the oil inlet flow, so that the shaft core 1 can perform angle regulation in the range of the shaft matching clearance, the flow of the upper oil distribution cavity 32 is regulated and increased, the pitch angle of the tip 2 can be finely regulated and decreased downwards, the flow of the upper oil distribution cavity 32 is regulated and decreased, the pitch angle of the tip 2 can be finely regulated and decreased upwards, and similarly, the yaw angle of the tip 2 can be finely regulated. It is understood that the embodiment shown in fig. 2 is only one embodiment of the present invention, and the number of the first bearing oil-dividing chambers is not limited to four, and may be provided in plural numbers such as two, three, etc.
It is understood that, in the above embodiment, the first bearing 3 and the second bearing 4 are not limited to the sequential position relationship in fig. 1, but it is also understood that the first bearing 3 is located behind the second bearing 4, that is, by adjusting the oil cavity gap of the oil cavity of the first bearing in the first bearing 3, the head or the tail of the shaft core 1 swings within a certain range to perform angle adjustment, so as to fine adjust the pitch and yaw angles of the center 2, and correct and position the axis inconsistency of the center 2.
In some embodiments, referring to fig. 2, the second bearing oil chamber 41 includes a plurality of second bearing oil-dividing chambers with adjustable oil chamber gaps, the plurality of second bearing oil-dividing chambers are distributed along the circumference of the second bearing 4, and the second oil-feeding passage includes a plurality of second oil-feeding oil-dividing passages connected to the second bearing oil-dividing chambers. In the embodiment, the first bearing 3 and the second bearing 4 both have an adjusting function, when the adjusting device is used, the first bearing 3 and/or the second bearing 4 can be adjusted by adjusting the oil inlet amount supplied to the first bearing oil distribution cavity and/or the second bearing oil distribution cavity, the shaft core 1 is subjected to angle adjustment in the shaft matching clearance range, the head and/or the tail of the shaft core 1 swings in a certain range, the pitching and sidesway angles of the tip 2 are finely adjusted, the axis inconsistency of the tip 2 is corrected and positioned, and therefore workpieces with consistent axes can be positioned and processed, the swing angle adjusting range of the embodiment is larger, and the adjusting speed is higher.
Referring to fig. 2, the first bearing 3 and the second bearing 4 have a plurality of sets of oil sealing edges 5, each set of oil sealing edges 5 includes at least two oil sealing edges 5 arranged along the axial direction, an oil return gap 51 is arranged between two adjacent oil sealing edges 5, the first bearing oil cavity 31 is divided into a plurality of first bearing oil dividing cavities by the sets of oil sealing edges 5, the second bearing oil cavity 41 is divided into a plurality of second bearing oil dividing cavities by the sets of oil sealing edges 5, the hydraulic pressure of the oil return gap 51 is low, the liquid medium entering the first bearing oil cavity 31 and flowing out of the oil return gap 51 from the oil sealing edges to the oil return gap 51, and oil return is realized.
The first bearing 3 and the second bearing 4 can be positioned by a bracket and other structures, and in some embodiments, referring to fig. 1, the first bearing further includes a box 6, an oil storage chamber 61 is formed inside the box 6, an oil return hole 62 is formed in the bottom of the box 6, and a liquid medium such as lubricating oil flows circularly through the oil return hole 62, so as to supplement the lubricating oil leaked from the first bearing oil chamber 31 and the second bearing oil chamber 41, and ensure that the oil film provides a stable and frictionless axial support for the shaft core 1. Wherein, first bearing 3 is located the box 6 front end to be connected with box 6, and second bearing 4 is located the box 6 rear end to be connected with box 6, and bearing and top 2 subassembly pass through box 6 support and connect into an organic whole. Referring to fig. 1, in order to improve the sealing property, a seal ring 63 may be provided between the housing 6 and the first bearing 3.
Further, referring to fig. 1, the first bearing 3 is provided with a front oil return groove 36 in front of the first bearing oil chamber 31, and the first oil return passage includes a front oil return pipe 37 communicating the front oil return groove 36 with the oil storage chamber 61; the second bearing 4 is provided with a rear oil return groove 42 at the rear of the second bearing oil chamber 41, the second oil return channel comprises a rear oil return pipeline 43 communicating the rear oil return groove 42 with the oil storage chamber 61, the liquid medium returned from the oil return gap 51 of the first bearing oil chamber 31 and the second bearing oil chamber 41 can directly flow out to the oil storage chamber 61 through the front radial oil return pipeline 38 and the rear radial oil return pipeline on one side, and flow out to the oil storage chamber 61 through the front oil return pipeline 37 and the rear oil return pipeline 43 on the other side.
One or more front oil return grooves 36 and front oil return pipelines 37 are arranged, and one or more rear oil return grooves 42 and rear oil return pipelines 43 are arranged. Referring to fig. 1, in some embodiments, a plurality of front oil sumps 36 are arranged in the front-rear direction, and a front oil seal cover 30 is arranged between the first bearing 3 and the first journal 11 in front of the front oil sumps 36; a plurality of rear oil return grooves 42 are provided in the front-rear direction, and a rear oil seal 44 is provided between the second bearing 4 and the second journal 12 behind the rear oil return grooves 42. The liquid medium returned from the oil return gap 51 of the first bearing oil chamber 31 and the second bearing oil chamber 41 can directly flow out to the oil storage chamber 61 through the front radial oil return pipeline 38 and the rear radial oil return pipeline on one side, and firstly flows out from the first-stage oil return pipeline and then flows out from the second-stage oil return pipeline to all flow out to the oil storage chamber 61 on the other side. The multi-stage oil return structure can ensure that the main shaft oil returns quickly and has no possibility of leakage.
In some embodiments, referring to fig. 1, the spindle 1 has a shoulder 13 between the first bearing 3 and the second bearing 4, the shoulder 13 being capable of cooperating with the first bearing 3 and the second bearing 4 for defining an axial displacement of the spindle 1. Referring to fig. 1, the hydrostatic tailstock further comprises a rear gland 7, the rear gland 7 is connected with the box body 6 or the second bearing 4, an elastic supporting part 71 is arranged between the rear gland 7 and the shaft core 1, the elastic supporting part 71 can be a spring, an elastic sheet, an elastic pad, an air support and the like, and the center 2 assembly clamps a workpiece through the elastic supporting part 71, so that the center 2 is stable and reliable in axial extension.
Further, referring to fig. 1, the device further comprises an adjusting member 72 and a rolling ball 73, wherein the adjusting member 72 is in threaded connection with the rear gland 7; the rear end of the shaft core 1 is provided with an axial hole 14, and a rolling ball 73 is arranged in the axial hole 14 and is matched with the shaft core 1 in a rolling way. The elastic supporting part 71 is supported between the rolling ball 73 and the adjusting part 72, the rolling ball 73 and the elastic supporting part 71 control the center 2 to axially extend and retract, the adjusting part 72 is screwed into the rear gland 7 to screw out the pressing force of the control spring, the rolling ball 73 at the end part of the elastic supporting part 71 is in contact fit with the inner conical surface of the axial hole 14, and the center 2 can still rotate together with a workpiece by adding the rolling ball 73, so that the abrasion degree is small.
The embodiment of the invention also provides a hydrostatic tailstock system, which comprises a plurality of flow-adjustable hydraulic pumps and a hydrostatic tailstock in any embodiment, the plurality of flow-adjustable hydraulic pumps are connected with the plurality of first bearing oil distribution cavities, and the hydrostatic tailstock system controls the oil cavity gaps of the corresponding first bearing oil distribution cavities connected with the hydraulic pumps by adjusting the flow of the hydraulic pumps, so that the shaft core 1 can perform angle adjustment in the range of the shaft matching gaps, the pitching and side-swinging angles of the center 2 are finely adjusted, and the inconsistent axes of the center 2 are corrected and positioned, thereby positioning and processing workpieces with consistent axes, reducing the workload of the conventional machine tool tailstock device for matching high-altitude and base, and having the advantages of high efficiency in centering clamping and high adjustment precision. The oil supply mode and the hydraulic structure can ensure that the liquid pressure of each first bearing oil distribution cavity is kept consistent, so that the center 2 assembly can still keep running stably in the adjusting process, and the rotating precision is high.
In some embodiments, referring to fig. 2, the hydraulic pump includes a first hydraulic pump 81, a second hydraulic pump 82, and a third hydraulic pump 83, the first bearing oil distribution chamber includes an upper oil distribution chamber 32, a lower oil distribution chamber 33, a left oil distribution chamber 34, and a right oil distribution chamber 35, the first hydraulic pump 81 is connected to the upper oil distribution chamber 32, the second hydraulic pump 82 is connected to the left oil distribution chamber 34, and the third hydraulic pump 83 is connected to the right oil distribution chamber 35 and the lower oil distribution chamber 33. Referring to fig. 2, the upper oil distribution chamber 32 and the left oil distribution chamber 34 of the first bearing 3 are respectively supplied with oil by a first hydraulic pump 81 and a second hydraulic pump 82, and the lower oil distribution chamber 33, the right oil distribution chamber 35 and the second bearing oil chamber 41 of the first bearing 3 are supplied with oil by a same third hydraulic pump 83; the upper oil distribution chamber 32 and the left oil distribution chamber 34 of the first bearing 3 can adjust the oil intake amount by the adjustment valve, thereby adjusting the oil chamber gap. Referring to fig. 2 and 3, the oil inlet amount Q of the upper oil distribution chamber 32 is adjusted to be increased (or decreased) so that the center 2 is shifted downward (or upward), and the radial clearance of the upper oil distribution chamber 32 is increased (or decreased) according to the formula (1), as shown in the equation0Increase (or decrease), the oil chamber hydraulic resistance R decreases (or increases), and the oil chamber pressure Pr1The pressure of the main shaft can be adjusted to be consistent with that of the lower oil distribution cavity 33, the main shaft can still keep running stably, and the main shaft has high rotation precision. Similarly, the adjustment increases (or decreases) the first bearing3, the oil amount of the left oil distributing cavity 34 is increased, so that the center 2 is shifted to the right (or left), and the pitching and yawing angles of the center 2 are finely adjusted.
Wherein the liquid resistance
In the formula: q-flow, Pr1Oil chamber pressure, h0Radial gap, h1Correction factor for oil film thickness (gap) unevenness, μ -viscosity of oil, D-axial diameter, φ0Oil pocket angle, L-oil pocket length, a-land width, b-land width
The hydrostatic tailstock system adopts a full liquid medium, oil is supplied through a hydraulic station, and spindle oil flows through the front axial oil inlet pipeline 15 and the rear axial oil inlet pipeline 16, the front radial oil inlet pipeline 17 and the rear radial oil inlet pipeline 18, and finally enters the first bearing oil cavity 31 and the second bearing oil cavity 41 by the third hydraulic pump 83; the first hydraulic pump 81 only supplies oil to the upper oil distribution cavity 32 of the first bearing 3, the second hydraulic pump 82 only supplies oil to the left oil distribution cavity 34 of the first bearing 3, and the main shaft oil directly enters the radial oil inlet pipeline and flows into the upper oil distribution cavity 32 and the left oil distribution cavity 34 of the first bearing 3. The main shaft oil return oil paths have the same oil cavities, the main shaft oil flows out of the oil cavity sealing oil to the oil return gap 51, and can flow out of the oil cavity sealing oil to the oil storage tank through the front radial oil return pipeline 38 or directly flow out of the oil storage tank, the other side of the main shaft oil return oil paths is provided with primary oil return pipelines 371 and 431 and secondary oil return pipelines 372 and 432, the main shaft oil firstly flows out of the primary oil return pipelines 371 and 431, and then flows out of the secondary oil return pipelines 372 and 432 to flow out of the oil storage chamber 61; the tail end front oil sealing cover 30 seals the main shaft oil, and the oil return structure can ensure that the main shaft oil returns quickly and has no possibility of leakage.
Embodiments of the present invention also provide a machine tool including a hydrostatic tailstock system according to any of the above embodiments.
Certain embodiments of the invention have the following advantages:
1. high-precision positioning clamp
The oil distribution cavity 32 and the left oil distribution cavity 34 on the first bearing 3 are respectively connected with a hydraulic station, the oil cavity clearance of the hydrostatic bearing is regulated and controlled by adjusting the oil inlet flow, so that the shaft core 1 can be subjected to angle adjustment in the range of the shaft matching clearance, the flow of the oil distribution cavity 32 in the increase and adjustment is regulated, the pitching angle of the tip 2 can be finely adjusted downwards, the flow of the oil distribution cavity can be adjusted and reduced, the pitching angle of the tip 2 can be finely adjusted upwards, and the side swinging angle of the tip 2 can be finely adjusted in the same way. The hydrostatic bearing structure has high rotation precision, and on the basis, the liquid medium and the incompressible property of the liquid medium are utilized, so that the effect of high-precision positioning and clamping can be realized.
2. High-efficiency positioning clamp
For batch processing, the coaxiality of the tip 2 is more and more along with more and more machined parts, and the requirement for adjustment is more and more. However, the existing technical structure for adjusting the deflection of the centre 2 cannot be applied to the hydrostatic tailstock, or the existing methods for matching the same height and the base and the like cause low processing efficiency. Therefore, the design and the adjustment of the structure of the tailstock are convenient and quick. And high-efficiency positioning and clamping can be realized.
3. High reliability, no abrasion, long service life
The shaft core 1 and the bearing are free of contact wear, the center 2 and the workpiece can rotate synchronously, the end of the center 2 is free of wear, and the service life of the tailstock main shaft is long. The rear end adopts the pressure spring structure, controls the spring pretightning force through nut screw in length to realize top 2 axial is flexible, and this kind of axial extending structure makes this tailstock main shaft stable in structure reliable with the hydrostatic pressure structure.
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 defined by the claims of the present application.
Claims (10)
1. Hydrostatic tailstock, its characterized in that: comprises that
The center assembly comprises a shaft core and a center, the center is connected with the shaft core, and the shaft core is provided with a first shaft neck and a second shaft neck;
the bearing, including first bearing and second bearing, first bearing with the cooperation of first journal, first bearing with be equipped with first bearing oil pocket between the first journal, first bearing oil pocket has first oil feed passageway and first oil return passageway, the second bearing with the cooperation of second journal, the second bearing with be equipped with the second bearing oil pocket between the second journal, the second bearing oil pocket has second oil feed passageway and second oil return passageway, wherein, first bearing oil pocket includes a plurality of oil pocket clearance adjustable first bearing branch oil pockets, and is a plurality of first bearing divides the oil pocket to follow the circumference of first bearing distributes, first oil feed passageway include a plurality of with the first oil feed branch passageway that first bearing divides the oil pocket to be connected, through adjusting the oil feed volume of inputing in the first bearing branch oil pocket to first bearing of first bearing, regulates and control the clearance that the first bearing of first bearing divides the oil pocket of first bearing, therefore, the pitching and side swinging angles of the center are finely adjusted, and the centering adjustment of the axis of the center is realized.
2. The hydrostatic tailstock according to claim 1, wherein: the second bearing oil chamber comprises a plurality of second bearing oil distribution chambers with adjustable oil chamber gaps, the second bearing oil distribution chambers are distributed along the circumferential direction of the second bearing, and the second oil inlet channel comprises a plurality of second oil inlet oil distribution channels connected with the second bearing oil distribution chambers.
3. The hydrostatic tailstock according to claim 2, wherein: first bearing and second bearing have multiunit oil seal limit, every group the oil seal limit all includes two at least oil seal limits that set up along the axial, adjacent two be equipped with the oil return clearance between the oil seal limit, the multiunit the oil seal limit will first bearing oil pocket divide into a plurality of first bearing divides the oil pocket, the multiunit the oil seal limit will second bearing oil pocket divide into a plurality of the second bearing divides the oil pocket.
4. The hydrostatic tailstock according to claim 1, wherein: also comprises
The oil storage tank comprises a tank body, wherein an oil storage cavity is formed in the tank body, and an oil return hole is formed in the bottom of the tank body;
the first bearing is positioned at the front end of the box body and connected with the box body, a front oil return groove is formed in the front of the first bearing oil cavity of the first bearing, and the first oil return channel comprises a front oil return pipeline communicated with the front oil return groove and the oil storage cavity; the second bearing is located the box rear end to with the box is connected, the second bearing in the rear of second bearing oil pocket is equipped with back oil gallery, the second oil return passageway is including the intercommunication back oil gallery with the back oil return pipe in oil storage chamber.
5. The hydrostatic tailstock according to claim 4, wherein: a plurality of front oil return grooves are formed in the front-back direction, and a front oil seal cover is arranged between the first bearing and the first journal in front of the front oil return grooves; the rear oil return grooves are arranged in a plurality of front and rear directions, and a rear oil seal cover is arranged between the second bearing and the second journal and behind the rear oil return grooves.
6. The hydrostatic tailstock according to claim 4, wherein: also comprises
The rear gland is connected with the box body or the second bearing, and an elastic supporting component is arranged between the rear gland and the shaft core;
wherein a shoulder is provided between the shaft core and the first and second bearings.
7. The hydrostatic tailstock according to claim 6, wherein: also comprises
The adjusting component is in threaded connection with the rear gland;
the rear end of the shaft core is provided with an axial hole, and the rolling ball is arranged in the axial hole and is in rolling fit with the shaft core;
wherein the elastic support member is supported between the rolling ball and the adjustment member.
8. Hydrostatic pressure tailstock system, its characterized in that: comprises that
A hydrostatic tailstock according to any one of claims 1 to 7;
and the hydraulic pumps with adjustable flow are connected with the first bearing oil distribution chambers.
9. The hydrostatic tailstock system according to claim 8, wherein: the hydraulic pump comprises a first hydraulic pump, a second hydraulic pump and a third hydraulic pump, the first bearing oil distribution cavity comprises an upper oil distribution cavity, a lower oil distribution cavity, a left oil distribution cavity and a right oil distribution cavity, the first hydraulic pump is connected with the upper oil distribution cavity, the second hydraulic pump is connected with the left oil distribution cavity, and the third hydraulic pump is connected with the right oil distribution cavity and the lower oil distribution cavity.
10. Machine tool, its characterized in that: comprising a hydrostatic tailstock system as claimed in claim 8 or 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911352884.6A CN110976924B (en) | 2019-12-25 | 2019-12-25 | Hydrostatic tailstock, hydrostatic tailstock system and machine tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911352884.6A CN110976924B (en) | 2019-12-25 | 2019-12-25 | Hydrostatic tailstock, hydrostatic tailstock system and machine tool |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110976924A CN110976924A (en) | 2020-04-10 |
| CN110976924B true CN110976924B (en) | 2022-01-11 |
Family
ID=70075168
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911352884.6A Active CN110976924B (en) | 2019-12-25 | 2019-12-25 | Hydrostatic tailstock, hydrostatic tailstock system and machine tool |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110976924B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3533316A (en) * | 1967-04-24 | 1970-10-13 | Babcock & Wilcox Co | Hydrostatic precision tailstocks |
| US3812627A (en) * | 1972-12-29 | 1974-05-28 | Landis Tool Co | Pressure indicating device for hydrostatic bearings |
| CN102211210A (en) * | 2010-04-07 | 2011-10-12 | 王传平 | Composite centre with clamping function |
| CN106513719A (en) * | 2016-11-09 | 2017-03-22 | 武汉重型机床集团有限公司 | Tip adjusting method of main shaft of hydrostatic head rack of heavy load horizontal lathe based on three-point supporting structure |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2417953Y (en) * | 2000-05-11 | 2001-02-07 | 盐城市机床厂 | Centre |
| CN102840237B (en) * | 2012-07-27 | 2015-04-15 | 华中科技大学 | Liquid hydrostatic bearing capable of realizing oil distribution from end surface |
| KR101882080B1 (en) * | 2016-06-29 | 2018-07-25 | 현대위아 주식회사 | Hydraulic static pressure tail stock and machine tools equipped with the tail stock |
| CN106563976B (en) * | 2016-11-09 | 2018-11-27 | 武汉重型机床集团有限公司 | A kind of static pressure oil film compensation method improving Boring concentricity |
-
2019
- 2019-12-25 CN CN201911352884.6A patent/CN110976924B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3533316A (en) * | 1967-04-24 | 1970-10-13 | Babcock & Wilcox Co | Hydrostatic precision tailstocks |
| US3812627A (en) * | 1972-12-29 | 1974-05-28 | Landis Tool Co | Pressure indicating device for hydrostatic bearings |
| CN102211210A (en) * | 2010-04-07 | 2011-10-12 | 王传平 | Composite centre with clamping function |
| CN106513719A (en) * | 2016-11-09 | 2017-03-22 | 武汉重型机床集团有限公司 | Tip adjusting method of main shaft of hydrostatic head rack of heavy load horizontal lathe based on three-point supporting structure |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110976924A (en) | 2020-04-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203696631U (en) | Large shaft hole grinding device | |
| CN106041649A (en) | Grinding method and grinding apparatus | |
| CN104625765A (en) | High-precision micro-miniature air static-pressure rotary table | |
| CN115415559A (en) | Large-bearing gas static pressure main shaft with radial throttlers in non-uniform distribution | |
| KR20180002174A (en) | Hydraulic static pressure tail stock and machine tools equipped with the tail stock | |
| CN113635083A (en) | Horizontal numerical control rotary table with rotary oil way | |
| CN110976924B (en) | Hydrostatic tailstock, hydrostatic tailstock system and machine tool | |
| US3189389A (en) | Bearing | |
| CN111070091B (en) | Movable center tailstock, tailstock system and machine tool | |
| CN108032123A (en) | A kind of ball head core shaft rigid grasp frock | |
| CN110230642B (en) | Novel hydrostatic thrust bearing device | |
| CN211332250U (en) | Adjustable rocker arm deep hole drilling clamp | |
| CN106903522A (en) | A kind of special flexible jig of milling flat | |
| CN208879715U (en) | A kind of longitudinal sectional complex milling machine tool electric main shaft device | |
| CN106001687A (en) | Boring bar device for deep hole processing | |
| CN201320706Y (en) | Bearing for centerless grinder | |
| CN205733120U (en) | A kind of boring bar device for deep hole machining | |
| CN204735973U (en) | Starter motor rotor commutator finish turning anchor clamps | |
| CN111539075B (en) | Method for constructing cone angle deviation precision model of valve sleeve inner conical surface | |
| CN215238037U (en) | Hole machining spray-suction drilling system and drill bit thereof | |
| CN101439471A (en) | Machine tool gas kinetic pressure center frame | |
| CN112589484A (en) | Hole machining method for lathe or boring machine | |
| CN204975364U (en) | High -accuracy static pressure main shaft | |
| CN106216719A (en) | A kind of Double End lathe tool and Double End processing method | |
| CN203578787U (en) | Self-centering flange frame for rear tailstock |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |