CN109128868A - A kind of static pressure workbench oil film thickness method based on application factor method - Google Patents
A kind of static pressure workbench oil film thickness method based on application factor method Download PDFInfo
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- CN109128868A CN109128868A CN201810390799.8A CN201810390799A CN109128868A CN 109128868 A CN109128868 A CN 109128868A CN 201810390799 A CN201810390799 A CN 201810390799A CN 109128868 A CN109128868 A CN 109128868A
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- film thickness
- oil film
- electric machine
- machine frequency
- application factor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q1/00—Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
- B23Q1/25—Movable or adjustable work or tool supports
- B23Q1/26—Movable or adjustable work or tool supports characterised by constructional features relating to the co-operation of relatively movable members; Means for preventing relative movement of such members
- B23Q1/38—Movable or adjustable work or tool supports characterised by constructional features relating to the co-operation of relatively movable members; Means for preventing relative movement of such members using fluid bearings or fluid cushion supports
Abstract
The present invention relates to it is a kind of when variable working condition under static pressure workbench oil film thickness adjust and control method, belong to mechanical engineering field.The present invention avoids Working table structure size, load, cutting force, oil temperature, the when variable working condition factor that these influence oil film thicknesses of viscosity are formed, one group of electric machine frequency need to be only set under current working, measure corresponding oil film thickness, obtain electric machine frequency and oil film thickness one-to-one relationship, to acquire the average application factor of this group of data, establish the Controlling model between electric machine frequency and oil film thickness, oil film thickness target value is substituted into the Controlling model, reverse electric machine frequency, this frequency is the required electric machine frequency of the time-varying working condition, then with this electric machine frequency driving motor, drive oil pump, oil film thickness is adjusted to target value.The device of the invention has many advantages, such as that process is easy, adjusted result is accurate, it is small to adjust error.
Description
Technical field
The present invention relates to it is a kind of when variable working condition under static pressure workbench oil film thickness adjust and control method, belong to mechanical engineering
Field.
Background technique
Static pressure rotary worktable has the characteristics that small frictional force, low abrasion, low speed are wide with stable working state without creeping
It is general to be applied to large-scale, heavy precision machine tool.But in practical applications, the oil film thickness of static pressure rotary worktable is such as outer with operating condition
The variation of the operating conditions factor such as load, cutting force, oil temperature and change, deviate design object value, while oil film thickness measurement is accurate
To micron, required precision is very high, and therefore, it is difficult to establish to be accurately controlled model oil film thickness is adjusted to target value.By oil film thickness
Degree control is to guarantee machine finish in target value, improves the important means of processing quality.
The control method of usual static pressure workbench oil film thickness is the oil supply system structure from static pressure workbench, analysis
The transmission function of system links establishes the oil film thickness model based on transmission function, carries out to oil film thickness
It adjusts and controls, however have ignored the variation of working condition mostly, such as workbench load, cutting force, oil temperature, the viscosity of hydraulic oil
Deng variation, the accurate control of oil film thickness is difficult to realize using indemnifying measure.
Summary of the invention
In view of the deficiencies of the prior art, the present invention separately wards off new river rising in Ningxia and flowing into central Shaanxi, without considering working condition, even if not knowing workbench
The parameters such as structure size, workbench load, cutting force, oil temperature, the viscosity of hydraulic oil, it is only necessary to be arranged under the conditions of current working
One group of electric machine frequency measures corresponding oil film thickness under real operating condition, one group of electric machine frequency and oil film thickness value is obtained, according to this
A little data calculate application factor, can establish real-time oil film thickness model, realize the adjusting control of oil film thickness.
The technical scheme is that a kind of static pressure workbench oil film thickness method based on application factor method,
It is characterized in that: including the following steps, calculate average application factorThe step of；Calculate the corresponding electric machine frequency of target oil film thickness
Step；Controller exports the step of corresponding electric machine frequency of target oil film thickness controls motor；
Wherein, the calculating process of average application factor are as follows: one group of electric machine frequency f of setting1, f2..., fn, and run static pressure work
Make platform, measures corresponding oil film thickness h respectively1, h2..., hn, obtain the corresponding application factor k of each electric machine frequency1, k2...,
kn, by averaging, obtain average application factor
The corresponding electric machine frequency of target oil film thicknesshmFor target oil film thickness.
According to the static pressure workbench oil film thickness method as described above based on application factor method, it is characterised in that:
The oil supply system of workbench is frequency control oil supply system.
The beneficial effects of the present invention are: being suitable for the static pressure workbench of frequency control oil supply system；And control process is easy,
Adjusted result is accurate, using the adjusting error of method oil film thickness of the invention less than 3%.
Detailed description of the invention
Fig. 1 is workbench static-pressure oil chamber structure chart.
Fig. 2 is that oil film thickness detects and adjusts test platform block diagram.
Specific embodiment
Technical solution of the present invention is described further below in conjunction with attached drawing.
The technical problem to be solved in the present invention is that for the defects in the prior art, providing a kind of based on application factor method
Static pressure workbench oil film thickness method.
The technical proposal for solving the technical problem of the invention is: a kind of static pressure workbench oil based on application factor method
Film thickness control method, comprising the following steps:
1) the cube linear relationship of electric machine frequency and oil film thickness is derived
Workbench static pressure oil film formed structure as shown in Figure 1,
If guide rail oil pocket flow is Q, then
In formula, Q is oil pocket flow；β is rotary table structural coefficient；W is external applied load, h oil film thickness.
The theoretical flow of pump is related with the revolving speed of pump and discharge capacity, it may be assumed that
In formula, VpFor the discharge capacity of pump；ω is the angular speed of pump.Have again
In formula, f is control electric machine frequency；P is motor number of pole-pairs.
Joint type (1) (2) (3) can obtain between rotary table sliding surface between oil film thickness and hydraulic pump control electric machine frequency
There are following relationships are as follows:
IfThen have:
F=kh3 (5)
Coefficient k in definition (5) is application factor.Formula (5) shows that under a certain operating condition, electric machine frequency f and oil film are thick
There are certain relationships between degree h.That is: there are one using h as the cubic function of independent variable between electric machine frequency f and oil film thickness h
Relationship is equivalent to the most high-order term of interception cubic polynomial, ignores its secondary, primary and constant term.If operating condition is constant, i.e. k
There are linear relationships for the cube of electric machine frequency f and oil film thickness h when for constant.When operating condition variation, value just occurs therewith
Change.Formula (5) adapts to any working condition.
2) oil film thickness model is established based on application factor method
Application factor k by the viscosity of workbench oil channel structures, current load and oil, oil pump is every turns discharge capacity, motor number of pole-pairs
Etc. operating conditions factor determine.If attempting to be nearly impossible by all duty parameters of determination to acquire application factor k.
According to formula (5):
K=f/h3 (6)
To obtain the application factor under current working, by electric machine frequencyIt is interior, set a certain motor
Frequency surveys the oil film thickness under the frequency, and calculates the application factor k under the operating condition using formula (6).
If calculating corresponding electric machine frequency according to formula (5) are as follows:
The corresponding electric machine frequency of target oil film thickness theoretically can be obtained according to formula (5), (6), (7), by oil film thickness
It is adjusted to target value.But since application factor k is only the measurement of certain point and calculated value under current working, not
Cover entire frequency range.With the variation of electric machine frequency actually under same operating, certain fluctuation can occur for application factor.
Thereafter example also indicates that electric machine frequency in 0~50Hz range, and application factor has certain fluctuation, but fluctuation range
< 1%.
For the precision for improving oil film thickness regulation and control, oil film need to be comprehensively considered within the scope of 0~50Hz electric machine frequency
Thickness property.Therefore, during the experiment, by setting one group of electric machine frequency f1, f2..., fn, corresponding oil film is measured respectively
Thickness h1, h2..., hn.Then application factor k is calculated using formula (6)1, k2..., kn.Finally by averaging, obtain
Average application factorThat is:
The application factor that is averaged finally is substituted into formula (7), the corresponding electric machine frequency of target oil film thickness is obtained, to realize
The adjusting of oil film thickness.This oil film thickness adjusting method is known as application factor method by us.
3) adjusting of oil film thickness and control precision
Motor is with frequency fmOperation measures oil film thickness h at this times, calculate and adjust control precision or adjusting error delta h=|
(hm-hs。)|/hm* 100%.
4) all-around test stand is built
Oil film thickness measuring instrument uses 3300 current vortex displacement of Germany rice iridium single channel Series of High Accuracy eddy NCDT
Sensor, measurement range are 0~0.4mm, precision 0.001mm.
For the accuracy for ensureing measurement experiment, eddy current displacement sensor is installed in static pressure workbench oil groove.Pass through
Sensor is installed in oil groove by protective case, can directly measure the change of oil film thickness.
Based on Siemens's 840DSL digital control system, SINUMERIK Operate is developed using tools such as QT and VS2008
Packet carries out oil film thickness controlling system exploitation.
The detection of static pressure rotary worktable oil film thickness is with adjusting test platform mainly by 840DSL control system, and rice is according to electric whirlpool
Flow sensor and fluid pressure workbench composition, as shown in Figure 2.
Certain specific embodiment:
Verification experimental verification is carried out on certain factory Φ 2500mm static pressure rotary worktable, which has constant temperature item
Part is set as 27 degree, and workbench maximum load-carrying capacity is 40T, table surface self weight 5T.Using the load block of 3 10T or so
It is tested, it is therefore an objective to verify the correctness of oil film thickness model under the working condition of different loads.
Test and validation result is as follows.
Table 1 is the calculated result of application factor k under idle condition.
The unloaded lower application factor measurement result of table 1
Data are analyzed it is found that there are small by application factor k under idle condition when setpoint frequency variation in [0,50] Hz
Fluctuation, but adjacent relative error between measured value, maxima and minima twice < 1%, it can thus be appreciated that coefficient k repeatability compared with
Well, accuracy is higher.
Table 2 is the knot for oil film thickness being adjusted using application factor method under four kinds of varying load working conditions control
Fruit.
2 application factor method adjusted result (target thickness h=0.02mm) of table
From the data in table 2, it can be seen that oil film thickness model is constructed using application factor method, it is thick to oil film under varying load operating condition
Control is adjusted in degree, and process is easy, and adjusted result is accurate, adjusts error less than 3%.Method of the invention is suitable for frequency conversion tune
The static pressure workbench of fast oil supply system.
Claims (2)
1. a kind of static pressure workbench oil film thickness method based on application factor method, it is characterised in that: include the following steps,
Electric machine frequency is equal to average application factor multiplied by the cube of oil film thickness, calculates average application factorThe step of；Calculate mesh
Mark the corresponding electric machine frequency step of oil film thickness；Controller exports the step of the corresponding electric machine frequency control motor of target oil film thickness
Suddenly；
Wherein, the calculating process of average application factor are as follows: one group of electric machine frequency f of setting1, f2..., fn, and run static pressure work
Platform measures corresponding oil film thickness h respectively1, h2..., hn, obtain the corresponding application factor k of each electric machine frequency1, k2..., kn,
By averaging, average application factor is obtained
The corresponding electric machine frequency of target oil film thicknesshmFor target oil film thickness.
2. the static pressure workbench oil film thickness method according to claim 1 based on application factor method, feature exist
In: the oil supply system of workbench is frequency control oil supply system.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111503152A (en) * | 2020-04-21 | 2020-08-07 | 南京工程学院 | Temperature rise control method for hydrostatic circular guide rail inclined plane oil pad |
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|---|---|---|---|---|
| CN103335616A (en) * | 2013-06-26 | 2013-10-02 | 西安交通大学 | Sliding bearing universe lubricant film thickness distribution detection method |
| CN104308561A (en) * | 2014-09-19 | 2015-01-28 | 井冈山大学 | Static pressure guide rail oil film thickness feedback compensation device |
| CN105690111A (en) * | 2016-04-08 | 2016-06-22 | 宜昌长机科技有限责任公司 | Self-adaptive static-pressure adjustment supporting device for large rotary workbench and oil film thickness control system and method |
| CN205552014U (en) * | 2016-04-08 | 2016-09-07 | 宜昌长机科技有限责任公司 | Large -scale rotary worktable self -adaptive control static pressure strutting arrangement |
-
2018
- 2018-04-27 CN CN201810390799.8A patent/CN109128868A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103335616A (en) * | 2013-06-26 | 2013-10-02 | 西安交通大学 | Sliding bearing universe lubricant film thickness distribution detection method |
| CN104308561A (en) * | 2014-09-19 | 2015-01-28 | 井冈山大学 | Static pressure guide rail oil film thickness feedback compensation device |
| CN105690111A (en) * | 2016-04-08 | 2016-06-22 | 宜昌长机科技有限责任公司 | Self-adaptive static-pressure adjustment supporting device for large rotary workbench and oil film thickness control system and method |
| CN205552014U (en) * | 2016-04-08 | 2016-09-07 | 宜昌长机科技有限责任公司 | Large -scale rotary worktable self -adaptive control static pressure strutting arrangement |
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| 靖马超: "静压回转工作台油膜厚度的控制方法研究", 《工程科技I辑》 * |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111503152A (en) * | 2020-04-21 | 2020-08-07 | 南京工程学院 | Temperature rise control method for hydrostatic circular guide rail inclined plane oil pad |
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