CN106513719A - Tip adjusting method of main shaft of hydrostatic head rack of heavy load horizontal lathe based on three-point supporting structure - Google Patents

Tip adjusting method of main shaft of hydrostatic head rack of heavy load horizontal lathe based on three-point supporting structure Download PDF

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Publication number
CN106513719A
CN106513719A CN201610983395.0A CN201610983395A CN106513719A CN 106513719 A CN106513719 A CN 106513719A CN 201610983395 A CN201610983395 A CN 201610983395A CN 106513719 A CN106513719 A CN 106513719A
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China
Prior art keywords
static
deflection
hydrostatic bearing
hydrostatic
main shaft
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CN201610983395.0A
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CN106513719B (en
Inventor
桂林
熊万里
何发诚
张召杰
闵祖冰
王俊
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Wuhan Heavy Duty Machine Tool Group Corp
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Wuhan Heavy Duty Machine Tool Group Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B23/00—Tailstocks; Centres
    • B23B23/04—Live centres
    • B23B23/045—Live centres the centres being adjustable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2233/00—Details of centres or drivers
    • B23B2233/12—Centres or drivers with a special arrangement of bearings or with special bearings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2233/00—Details of centres or drivers
    • B23B2233/28—Centres or drivers supporting the workpiece at three points around the circumference

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Magnetic Bearings And Hydrostatic Bearings (AREA)

Abstract

The invention discloses a tip adjusting method of a main shaft of a hydrostatic head rack of a heavy load horizontal lathe based on a three-point supporting structure. The three-point supporting structure is formed by a front hydrostatic bearing, a back hydrostatic bearing and a hydrostatic tray to the main shaft of the hydrostatic head rack. The front hydrostatic bearing is located between the back hydrostatic bearing and the hydrostatic tray, the mass distribution of the main shaft of the head rack is q, the action force of the total weight of a workpiece and a disc chuck to the tip is F, the bearing reaction of each supporting point of the three-point supporting structure is calculated according to a static equilibrium equation and a compatibility equation of deformation, then the deflection f at the tip of the head rack is calculated, the deflection permissible range at the tip of the head rack is set as +/-f0, the bearing reaction at the three point supporting points is adjusted by taking a liquid supply flow at the supporting points as an adjusting variable, so that the deflection f at the tip is adjusted, and the absolute value of f is less than or equal to f0. The tip adjusting method of the main shaft of the hydrostatic head rack of the heavy load horizontal lathe based on the three-point supporting structure has the advantages of being small in alteration, low in cost, accurate to adjust and high in efficiency.

Description

Heavily loaded sleeping carriage static head frame spindle top method of adjustment based on three-point support structure
Technical field
The present invention relates to the adjustment technology of large-scale heavy duty horizontal lathe, more particularly to the heavy duty based on three-point support structure is sleeping Car static head frame spindle top method of adjustment.
Background technology
The referred to as heavily loaded sleeping carriage of large-scale heavy duty horizontal lathe, is grand strategy equipment, such as overcritical nuclear power heavy type rotor and The rudderpost of large-scale naval vessels is processed by heavily loaded sleeping carriage.Hydrostatic spindle is the core functional components of numerical control heavy duty sleeping carriage, its Performance directly affects crudy, precision and efficiency.
In working shaft-like workpiece, the weight range of workpiece changes very greatly heavily loaded sleeping carriage, and about several tons little of workpiece is heavy, big Often tens tons of weights are even heavy up to 250 tons for workpiece.As workpiece weight difference is very big, after causing clamping workpiece, hydrostatic spindle is top The deflection deformation difference at place is very big.The deformation at the top place of hydrostatic spindle will cause the change of sleeping carriage working shaft-like part axiality, And then significantly affect the machining accuracy of shaft-like workpiece.
The content of the invention
The technical problem to be solved in the present invention is to overcome the deficiencies in the prior art, there is provided a kind of to change little, low cost, adjustment Accurately, the heavily loaded sleeping carriage static head frame spindle top method of adjustment based on three-point support structure of efficiency high.
To solve above-mentioned technical problem, the present invention is employed the following technical solutions：
A kind of heavily loaded sleeping carriage static head frame spindle top method of adjustment based on three-point support structure, by front hydrostatic bearing, Hydrostatic bearing and static-pressure bracket form three-point support structure to static head frame main shaft afterwards, and front hydrostatic bearing is located at rear hydrostatic bearing and quiet Between pressure support, it is F to the active force of top generation that headstock spindle Mass Distribution is q, workpiece and floral disc gross weight, flat according to static(al) The support reaction of weighing apparatus equation and each fulcrum of Coordinate deformation equation calculating three-point support structure, then amount of deflection f at the top place of the headstock is calculated, if The amount of deflection allowed band for determining the top place of the headstock is ± f0, with the confession flow quantity at fulcrum to adjust variable to propping up at three-point support Counter-force is adjusted, and then realizes being adjusted amount of deflection f at top place so that | f |≤f0。
Carried out during amount of deflection f for calculating the top place of the headstock according to the following steps：
S1：If the support reaction of front hydrostatic bearing is F3, the support reaction of rear hydrostatic bearing is F1, and the support reaction of static-pressure bracket is F2；
S2：List the equation of static equilibrium：
F1+F2+F3=F+q (l+a)；
S3：List Coordinate deformation equation：At the support reaction F3 of front hydrostatic bearing, the amount of deflection sum that each external force is produced is equal to Fore bearing bias placement e3,
Wherein,
S4：Coordinate deformation equation in the equation of static equilibrium and step S3 that connection is gone through in step S2, obtains support reaction F3；
S5：On the basis of the support reaction F3 for obtaining, amount of deflection f at the top place of the headstock is further sought：
F=fF'+fq1'+fq2'+fF3',
Wherein,
Adjust three-point support at fulcrum at support reaction when, the fuel delivery per minute of the oil pump of static-pressure bracket fuel feeding is carried out Adjustment.
Compared with prior art, it is an advantage of the current invention that：
The heavily loaded sleeping carriage static head frame spindle top method of adjustment based on three-point support structure of the present invention, with workpiece weight Size be kernel variable, active accommodation is carried out to the support reaction of three-point support, is drawn so as to reduce or offset workpiece weight change The static head frame main shaft deflection deformation for rising, makes the top position of static head frame main shaft keep being basically unchanged, top before and after significantly improving The contour of point, reduces or eliminates axiality change during sleeping carriage working shaft-like part, improve the machining accuracy of shaft-like workpiece；For Change very little of the method on the basis of conventional hydraulic oil supply system is realized, increase cost is few, simple structure；Avoid it is simple according to By the uncertainty manually adjusted by empirical data, labour intensity is significantly reduced, improve setting for machine efficiency.In adjustment At fulcrum at three-point support during support reaction, the fuel delivery per minute of the oil pump of static-pressure bracket fuel feeding is adjusted, due to static pressure Stress point based on support, its oil pocket pressure and oil film thickness are most fast to the response speed that fuel delivery per minute changes, and regulated efficiency is most It is high.
Description of the drawings
Fig. 1 is the structural representation of three-point support structure heavy duty sleeping carriage static head frame main shaft.
Fig. 2 is three-point support model of structural mechanics figure.
Fig. 3 is the method for adjustment flow chart of the present invention.
In figure, each label is represented：
1st, front hydrostatic bearing；2nd, rear hydrostatic bearing；3rd, static-pressure bracket；4th, headstock spindle.
Specific embodiment
Fig. 1 to Fig. 3 shows the heavily loaded sleeping carriage static head frame spindle top adjustment based on three-point support structure of the present invention Embodiment of the method, the method are to form three point to static head frame main shaft 4 by front hydrostatic bearing 1, rear hydrostatic bearing 2 and static-pressure bracket 3 Supporting structure, front hydrostatic bearing 1 be located between rear hydrostatic bearing 2 and static-pressure bracket 3,4 Mass Distribution of headstock spindle be q, workpiece and Floral disc gross weight is F to the active force of top generation, calculates three-point support knot according to the equation of static equilibrium and Coordinate deformation equation The support reaction of each fulcrum of structure, then amount of deflection f at the top place of the headstock is calculated, the amount of deflection allowed band at the top place of the headstock is set as ± f0, The support reaction at three-point support is adjusted with the confession flow quantity at fulcrum to adjust variable, and then realizes scratching top place Degree f is adjusted so that | f |≤f0.The present invention's is adjusted based on the heavily loaded sleeping carriage static head frame spindle top of three-point support structure Adjusting method, the size with workpiece weight carry out active accommodation to the support reaction of three-point support as kernel variable, so as to reducing or supporting The static head frame main shaft deflection deformation that the workpiece weight change that disappears causes, makes the top position of static head frame main shaft keep substantially not Become, top contour before and after significantly improving, reduce or eliminate axiality change during sleeping carriage working shaft-like part, improve axle class The machining accuracy of workpiece；To realize change very little of the method on the basis of conventional hydraulic oil supply system, increase cost is few, structure Simply；The uncertainty for being manually adjusted by empirical data merely is avoided, labour intensity is significantly reduced, is improve machine Bed regulated efficiency.
Carried out during amount of deflection f for calculating the top place of the headstock according to the following steps：
S1：If the support reaction of front hydrostatic bearing is F3, the support reaction of rear hydrostatic bearing is F1, and the support reaction of static-pressure bracket is F2；
S2：List the equation of static equilibrium：
F1+F2+F3=F+q (l+a)；
S3：List Coordinate deformation equation：At the support reaction F3 of front hydrostatic bearing, the amount of deflection sum that each external force is produced is equal to Fore bearing bias placement e3,
Wherein,
S4：Coordinate deformation equation in the equation of static equilibrium and step S3 that connection is gone through in step S2, obtains support reaction F3；
S5：On the basis of the support reaction F3 for obtaining, amount of deflection f at the top place of the headstock is further sought：
F=fF'+fq1'+fq2'+fF3',
Wherein,
In the present embodiment, to adjusting the oil pump that static-pressure bracket fuel feeding is adjusted during support reaction at the fulcrum at three-point support Fuel delivery per minute, due to stress point based on static-pressure bracket, the sound that its oil pocket pressure and oil film thickness change to fuel delivery per minute Should be fastest, regulated efficiency highest.
Although the present invention is disclosed above with preferred embodiment, but it is not limited to the present invention.It is any to be familiar with ability The technical staff in domain, in the case of without departing from technical solution of the present invention scope, all using the technology contents pair of the disclosure above Technical solution of the present invention makes many possible variations and modification, or the Equivalent embodiments for being revised as equivalent variations.Therefore, it is every Without departing from the content of technical solution of the present invention, according to the technology of the present invention essence to any simple modification made for any of the above embodiments, Equivalent variations and modification, all should fall in the range of technical solution of the present invention protection.

Claims (3)

1. a kind of heavily loaded sleeping carriage static head frame spindle top method of adjustment based on three-point support structure, it is characterised in that：By front Hydrostatic bearing, rear hydrostatic bearing and static-pressure bracket form three-point support structure to static head frame main shaft, and front hydrostatic bearing is located at rear quiet Last item is held and static-pressure bracket between, and it is F to the active force of top generation that headstock spindle Mass Distribution is q, workpiece and floral disc gross weight, The support reaction of each fulcrum of three-point support structure is calculated according to the equation of static equilibrium and Coordinate deformation equation, then calculates the top place of the headstock Amount of deflection f, set the amount of deflection allowed band at the top place of the headstock as ± f0, with the confession flow quantity at fulcrum to adjust variable to 3 points Support reaction at supporting is adjusted, and then realizes being adjusted amount of deflection f at top place so that | f |≤f0。
2. the heavily loaded sleeping carriage static head frame spindle top method of adjustment based on three-point support structure according to claim 1, It is characterized in that：Carried out during amount of deflection f for calculating the top place of the headstock according to the following steps：
S1：If the support reaction of front hydrostatic bearing is F3, the support reaction of rear hydrostatic bearing is F1, and the support reaction of static-pressure bracket is F2；
S2：List the equation of static equilibrium：
F 1 · l + F 3 · n + F a = q ( l 2 - a 2 ) 2 ,
F1+F2+F3=F+q (l+a)；
S3：List Coordinate deformation equation：At the support reaction F3 of front hydrostatic bearing, the amount of deflection sum that each external force is produced is equal to front axle Bias placement e3 is held,
f × = f F + f q 1 + f q 2 = f F 3 = e 3 = - F 3 K 3 ,
Wherein,
f F = F · a ( l - n ) [ l 2 - ( l - n ) 2 ] 6 E I l + F · a · n l 2 K 1 - F ( l - n ) ( l + a ) l 2 K 2 ,
f q 1 = - q ( l - n ) [ l 3 - 2 l ( l - n ) 2 + ( l - n ) 3 ] 24 E I - q n 2 K 1 - q ( l - n ) 2 K 2 ,
f q 2 = qa 2 ( l - n ) [ l 2 - ( l - n ) 2 ] 12 E I + qna 2 2 l 2 K 1 - q a ( l - n ) ( 2 l + a ) 2 l 2 K 2 ;
S4：Coordinate deformation equation in the equation of static equilibrium and step S3 that connection is gone through in step S2, obtains support reaction F3；
S5：On the basis of the support reaction F3 for obtaining, amount of deflection f at the top place of the headstock is further sought：
F=fF'+fq1'+fq2'+fF3',
Wherein,
f F ′ = F a [ a 2 - a ( 2 l + 3 a ) ] 6 E I - Fa 2 l 2 K 1 - F ( l + a ) 2 l 2 K 2 ,
f q 1 ′ = ql 3 a 24 E I + q a 2 K 1 - q ( l + a ) 2 K 2 ,
f q 2 ′ = - q a 24 E I [ 2 a 2 ( 3 a + 2 l ) - 3 a 3 ] + qa 3 2 l 2 K 1 - q a ( 2 l + a ) ( l + a ) 2 l 2 K 2 ,
f F 3 ′ = - F 3 ( l - n ) n ( 2 l - n ) 6 E I l · a - F 3 n a l 2 K 1 - F 3 ( l - n ) ( l + a ) l 2 K 2 .
3. the heavily loaded sleeping carriage static head frame spindle top adjustment side based on three-point support structure according to claim 1 and 2 Method, it is characterised in that：Adjust three-point support at fulcrum at support reaction when, the fuel feeding per minute to the oil pump of static-pressure bracket fuel feeding Amount is adjusted.
CN201610983395.0A 2016-11-09 2016-11-09 Heavily loaded sleeping carriage static head frame spindle top method of adjustment based on three-point support structure Active CN106513719B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110976924A (en) * 2019-12-25 2020-04-10 广州市昊志机电股份有限公司 Hydrostatic tailstock, hydrostatic tailstock system and machine tool

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2254384Y (en) * 1994-07-01 1997-05-21 湘潭大学 Static pressure floating rotary centre
US20020000141A1 (en) * 2000-03-17 2002-01-03 Mcmillian James Dale Live center an HSK taper shank actuated by a manual clamping device
CN2565568Y (en) * 2002-09-05 2003-08-13 江南造船(集团)有限责任公司 Eccentric shaft processing tool
CN2639870Y (en) * 2003-08-12 2004-09-08 哈尔滨量具刃具厂 Heavy load anti-deformation mechanism
CN201108963Y (en) * 2007-09-25 2008-09-03 万向集团公司 Thimble device
CN103495745A (en) * 2013-10-15 2014-01-08 江苏精海变压器有限公司 Tailstock

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2254384Y (en) * 1994-07-01 1997-05-21 湘潭大学 Static pressure floating rotary centre
US20020000141A1 (en) * 2000-03-17 2002-01-03 Mcmillian James Dale Live center an HSK taper shank actuated by a manual clamping device
CN2565568Y (en) * 2002-09-05 2003-08-13 江南造船(集团)有限责任公司 Eccentric shaft processing tool
CN2639870Y (en) * 2003-08-12 2004-09-08 哈尔滨量具刃具厂 Heavy load anti-deformation mechanism
CN201108963Y (en) * 2007-09-25 2008-09-03 万向集团公司 Thimble device
CN103495745A (en) * 2013-10-15 2014-01-08 江苏精海变压器有限公司 Tailstock

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110976924A (en) * 2019-12-25 2020-04-10 广州市昊志机电股份有限公司 Hydrostatic tailstock, hydrostatic tailstock system and machine tool
CN110976924B (en) * 2019-12-25 2022-01-11 广州市昊志机电股份有限公司 Hydrostatic tailstock, hydrostatic tailstock system and machine tool

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