CN113158369A - Oil film flow simulation monitoring method for oil seal edge of hydrostatic thrust bearing oil pad - Google Patents
Oil film flow simulation monitoring method for oil seal edge of hydrostatic thrust bearing oil pad Download PDFInfo
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Abstract
The invention discloses a method for simulating and monitoring oil film flow of an oil seal edge of a hydrostatic thrust bearing oil pad, mainly relates to a method for monitoring oil film flow values of the oil seal edge of the hydrostatic thrust bearing double rectangular cavities under different working conditions by using FLUENT software, and aims to solve the problem that the flow values of lubricating oil in the hydrostatic thrust bearing cannot be actually and effectively simulated and monitored when the lubricating oil flows through the oil seal edge of the oil pad. The method comprises the following steps: (1) establishing a double-rectangular-cavity oil pad oil film three-dimensional model by using three-dimensional modeling software, and introducing the three-dimensional model into ICEM CFD software for high-quality mesh division; (2) adopting FLUENT software to divide the divided three-dimensional networkCarrying out scaling processing on the grid model, checking grid information and checking grid quality; (3) selecting a solver type and a physical model; (4) setting materials and defining calculation domains and boundary conditions; (5) determining a solving method and solving control parameters; (6) defining a lubricating oil flow monitoring surface of an oil sealing edge of the oil pad; (7) initializing and setting a reasonable iteration step number; (8) residual convergence case selection 10‑3The fluctuation is stable, and the flow rate of the lubricating oil at the oil sealing edge of the oil pad can be checked with an obvious downward trend; the invention is suitable for the field of lubricating oil film simulation monitoring of the hydrostatic bearing technology of the heavy-duty hydrostatic machine tool.
Description
Technical Field
The invention relates to a method for simulating and monitoring oil film flow of an oil seal edge of a hydrostatic thrust bearing oil pad, in particular to a method for simulating and monitoring oil film flow of an oil seal edge of a hydrostatic thrust bearing double rectangular cavity oil pad by using FLUENT software, and belongs to the technical field of hydrostatic bearings of heavy-duty hydrostatic machine tools.
Background
The hydrostatic thrust bearing has the advantages of low friction, no abrasion, high rigidity, large damping, large bearing capacity, stable operation and the like in the operation process, becomes a key part for realizing high-precision stable operation of high-end manufacturing equipment, and is widely applied to the fields of military affairs, nuclear power, ship manufacturing, aerospace, national defense and other national key industries. However, under the high-speed and heavy-load operation condition of the hydrostatic thrust bearing, the shearing calorific value of a gap oil film is increased, the flow carried by hot oil of the oil film is increased, and the heat is accumulated continuously and cannot be diffused, so that the oil film is uneven and thin, the hydrostatic bearing capacity is reduced, local oil film breakage and dry friction can occur in severe cases, the temperature of the oil film is increased finally, the thermal deformation of a machine tool occurs, and the operation precision and the stability of heavy numerical control machining equipment are seriously influenced. However, in an oil film temperature rise equation derived theoretically, the main factor directly influencing the oil film temperature is the flow value flowing through each part, and the research on simulation methods for the specific flow value of the lubricating oil of the hydrostatic thrust bearing flowing through each part is less at home and abroad, so that the method for simulating and monitoring the oil film flow of the oil seal edge of the hydrostatic thrust bearing is important, and provides a basis and an idea for further optimization design of the oil film temperature rise problem of the hydrostatic thrust bearing and also provides a theoretical basis for the processing precision and the operation stability of numerical control equipment under the high-speed and heavy-load working conditions.
Disclosure of Invention
The invention aims to monitor oil film flow values of oil sealing edges of hydrostatic thrust bearing oil pads under different working conditions by using FLUENT software to obtain the oil film flow values, provide real flow for temperature rise calculation of the hydrostatic thrust bearing oil films, further solve the problem of troublesome oil film temperature rise and provide theoretical basis for temperature rise control and heat dissipation scheme determination.
The method for simulating and monitoring the oil film flow of the oil seal edge of the hydrostatic thrust bearing is realized by the following technical scheme; (1) establishing a double-rectangular-cavity oil pad oil film three-dimensional model (12 oil pads are generally uniformly and symmetrically distributed on a hydrostatic thrust bearing circumferential guide rail, and since the specific structure, working parameters and performance of each oil pad are the same, 1/12 of the whole oil film is taken for calculation and analysis), and introducing the three-dimensional model into ICEM CFD software for high-quality grid division;
(2) opening FLUENT software, importing the divided three-dimensional grid model, carrying out scaling processing on the model, checking grid information and checking grid quality;
(3) selecting a solver type and a physical model;
(4) setting materials and defining calculation domains and boundary conditions;
(5) determining a solving method and solving control parameters;
(6) defining an oil film flow monitoring surface of an oil sealing edge of the oil pad;
(7) initializing and setting a reasonable iteration step number;
(8) and selecting 10-3 residual convergence conditions, stabilizing fluctuation and having an obvious descending trend, and checking the specific value of the oil film flow of the oil edge of the oil pad seal.
The invention has the advantages that
The invention utilizes the computer to carry out oil pad oil seal edge oil film flow simulation monitoring on various actual working conditions of the static pressure thrust bearing worktable on site, obtains and researches flow parameters after the temperature of the oil film rises, reveals the main influence rule of thinning of the static pressure thrust bearing oil film and reducing of bearing capacity, and lays a technical foundation for the subsequent optimization design of the static pressure thrust bearing and the realization of high efficiency and high precision. The computer numerical simulation process accords with the engineering actual condition, and designers can clearly see the specific numerical value of the oil film flow at each position for calculating a series of equations such as oil film temperature and oil film loss, and the numerical simulation result has important practical value. The method has simple process and convenient operation, can obtain a large amount of reliable data in a short time, and is a non-binary choice for monitoring the specific numerical value of the oil film flow.
Drawings
For ease of illustration, the invention is described in detail by the following detailed description and the accompanying drawings.
FIG. 1 is a flow chart of a method for simulating and monitoring oil film flow of an oil seal edge of a hydrostatic thrust bearing.
FIG. 2 is a three-dimensional model of the oil film of the single double rectangular cavity oil pad mentioned in step A.
FIG. 3 is a diagram of the model operation tree and parameter set-up panel of FLUENT software.
Fig. 4 is a schematic diagram of the positions of the 4 oil film flow monitoring surfaces mentioned in step F.
Fig. 5 is a graph of the iterative residuals referred to in step H.
FIG. 6 is a diagram of the oil film flow rate at the oil sealing edge of the oil pad with the double rectangular cavities mentioned in step H.
Detailed Description
In order that the objects, aspects and advantages of the invention will become more apparent, the invention will be described by way of example only, and in connection with the accompanying drawings. It is to be understood that such description is merely illustrative and not intended to limit the scope of the present invention.
Step A: and establishing a three-dimensional model of the oil film of the double rectangular cavity oil pad by using Creo or other modeling software according to different working conditions, introducing the three-dimensional model into ICEM CFD software for high-quality meshing, and exporting the three-dimensional model by using a msh file.
Step B1: and starting the FLUENT module, activating the 3D model in the Dimension option, entering the Meshing module only when the 3D is selected, further checking Double Precision under the Options for high-Precision solution, and clicking an OK button to enter the FLUENT interface.
Step B2: importing a divided high-quality grid model, selecting Scale … in a General node in a Setup panel, and scaling a unit m to mm; check is selected to Check grid information, which mainly includes the geometric size, volume statistics and grid surface area statistics of a grid model, and the parameter most needing attention is minimum volume, which must be ensured to be a positive value.
And C: selecting User-Defined in menu bar Define, using viscosity-temperature equation μ 3.5665E31 (T)0+ΔT)-13.22838Setting a user-defined viscosity temperature control UDF program; selecting a model node, and starting Viscosous Heating in Energy-on and Viscosous-Laminar so as to calculate Energy in the process of solving the Laminar flow model; wherein, the user-defined viscosity temperature control UDF procedure in this patent is:
step D1: selecting Materials node to set material parameters, selecting Fluid, setting corresponding sensitivity to 880kg/m3, Cp (specific Heat) to 1884J/(kg K), Thermal Conductivity to 0.132w/m K; selecting a Cell Zone Condition node to set the attributes of the calculation domain, including the working medium, the motion state and the like of the calculation domain;
step D2: selecting a Boundary condition node of a calculation domain to set Boundary Conditions of the calculation domain, wherein the calculation domain comprises in _ left, in _ right, moving-wall, out _ former, out _ later and periodic _ left; the method comprises the steps that in _ left and in _ right select a Speed inlet velocity-inlet type, rotate Speed and inlet flow rate values are set according to different rotate speeds and loads, inlet oil temperature is set to be 298K, an out _ former and an out _ later select a Pressure outlet type, Gauge Pressure is 0, outlet oil temperature is defined to be 298K, and corresponding rotate speeds are input in Speed (m/s) in moving-wall options;
step E1: selecting Solution Methods nodes to set a solving algorithm in a Solution setting panel, wherein a steady-state calculation SIMPLEC separation algorithm is selected from a Scheme option, a Second-Order format of Second Order is selected from a Pressure option, a First Order Upwind First-Order windward format is selected from a Momentum option, and a Second-Order windward format of Second Order Upwind is selected from an Energy option;
step E2: selecting Solution Controls node to set solving control parameters, increasing the sub-relaxation factor in a certain range along with the increase of the load, setting the variation range of the relaxation factor of the Pressure equation to be 0.1-0.3, setting the range of the relaxation factor of the Momentum and energy equations to be 0.3-0.7, and adopting FLUENT default setting for the rest.
Step F: selecting a monitor node of Monitors to define an oil film flow monitor of an oil seal edge of an oil pad, clicking Create in a Surface monitor option to Create a flow monitoring Surface, selecting a Plane … under a New Surface option, and after selecting Bounded, inputting three coordinate values of the required monitoring Surface to click a Create end page, wherein the Plane-1 is selected to have the coordinates of (-144.5,920,25.1), (-144.5,830,25.1) and (-144.5,875,0.0743), the Plane-2 is selected to have the coordinates of (-144.5,820,25.1), (-144.5,730,25.1) and (-144.5,775,0.0743), the Plane-3 is selected to have the coordinates of (144.5,920,25.1), (144.5,830,25.1) and (144.5,875,0.0995), and the Plane-4 is selected to have the coordinates of (144.5,820,25.1), (144.5,730,25.1) and (144.5,775,0.0995), and the unit is mm;
step G: selecting Standard Initialization under a Solution Initialization node for Initialization; selecting a Run Calculation node to set iteration steps, setting the iteration steps to be 2000, and finally selecting Calculation to solve;
step H: and (4) checking whether the residual convergence condition is lower than 10 < -3 >, the fluctuation is stable, and the residual convergence condition has an obvious downward trend, if not, increasing the iteration step number to 5000 steps at the maximum, or modifying the parameter value of the sub-relaxation factor in the step E2, re-inputting the iteration step number for calculation and solution, and checking the oil film flow value of the oil seal oil edge until the residual convergence condition meets the requirement.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are intended to be illustrative only, and that various changes and modifications may be made without departing from the spirit and scope of the invention, which are intended to be within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (4)
1. The method for simulating and monitoring the oil film flow of the oil sealing edge of the hydrostatic thrust bearing oil pad is characterized in that the method for simulating and monitoring the oil film flow of the oil sealing edge of the hydrostatic thrust bearing oil pad by using FLUENT software is realized according to the following steps;
step A: establishing a required three-dimensional model by using Creo or other modeling software according to different working conditions, introducing the three-dimensional model into ICEM CFD software for high-quality meshing, and exporting the three-dimensional model by using a msh file;
step B1: starting a FLUENT module, activating a 3D model in a Dimension option, entering a Meshing module, further checking Double Precision under the Options to perform high-Precision solving, and clicking an OK button to enter a FLUENT interface;
step B2: importing a divided high-quality grid model, selecting Scale … in a General node in a Setup panel, and scaling a unit m to mm; selecting Check to Check grid information, wherein the Check mainly comprises the geometric size, volume statistics and grid surface area statistics of a grid model, the parameter which needs to be paid most attention is minimum volume, and the positive value of the parameter needs to be ensured;
and C: selecting User-Defined in a menu bar Define to set a User-Defined viscosity temperature control UDF program; selecting a model node, and starting Viscosous Heating in Energy-on and Viscosous-Laminar so as to calculate the Energy in the process of solving the Laminar flow model;
step D1: selecting a Fluid in Materials nodes to set material parameters, and selecting a Cell Zone Condition node to set the attributes of a calculation domain, including working media, motion state and the like of the calculation domain;
step D2: selecting a Boundary condition node of a calculation domain to set Boundary Conditions of the calculation domain, wherein the calculation domain comprises in _ left, in _ right, moving-wall, out _ former, out _ later and periodic _ left;
step E1: selecting Solution Methods nodes to set a solving algorithm in a Solution setting panel, wherein a steady-state calculation SIMPLEC separation algorithm is selected from a Scheme option, a Second-Order format of Second Order is selected from a Pressure option, a First Order Upwind First-Order windward format is selected from a Momentum option, and a Second-Order windward format of Second Order Upwind is selected from an Energy option;
step E2: selecting Solution Controls to set solving control parameters, increasing the sub-relaxation factor in a certain range along with the increase of the load, setting the variation range of the relaxation factor of a Pressure equation to be 0.1-0.3, setting the range of the relaxation factor of a Momentum equation and an energy equation to be 0.3-0.7, and adopting FLUENT default setting for the rest;
step F: selecting a monitor node to define an oil film flow monitor of an oil seal edge of an oil pad, clicking Create in a Surface Monitors option to Create a flow monitoring Surface, selecting Plane … under a New Surface option, and after checking bound, inputting three coordinate values of the Surface to be monitored so as to click a Create ending page;
step G: selecting Standard Initialization under a Solution Initialization node for Initialization; selecting a Run Calculation node to set iteration steps, and finally selecting Calculation to solve;
step H: and (4) checking whether the residual convergence condition is lower than 10 < -3 >, the fluctuation is stable, and the residual convergence condition has an obvious downward trend, if not, increasing the iteration step number to 5000 steps at the maximum, or modifying the parameter value of the sub-relaxation factor in the step E2, re-inputting the iteration step number for calculation and solution, and checking the oil film flow value of the oil seal oil edge until the residual convergence condition meets the requirement.
2. The method for simulating and monitoring oil film flow of the oil seal edge of the hydrostatic thrust bearing oil pad as claimed in claim 1, wherein the viscosity-temperature equation used in the step C is μ -3.5665E 31(T ═ 3.5665E310+ΔT)-13.22838The material parameter Density set in the step D1 is 880kg/m3, Cp (Spe)The cific Heat) was 1884J/(kg. multidot.K), and the Thermal Conductivity was 0.132 w/m. multidot.K.
3. The method for simulating and monitoring oil film flow at an oil sealing edge of a hydrostatic thrust bearing oil pad as claimed in claim 1, wherein in _ left and in _ right in step D2 are selected to be a Speed inlet velocity-unlet type, the rotating Speed and the inlet flow rate are set for different rotating speeds and loads, the inlet oil temperature is set to be 298K (room temperature 25 ℃), the out _ former and the out _ later are selected to be a Pressure outlet Pressure-outlet type, the Gauge Pressure is 0, the outlet oil temperature is defined to be 298K, and the corresponding rotating Speed is input in Speed (m/s) in moving-wall option.
4. The method for simulating and monitoring the oil film flow of the oil seal edge of the hydrostatic thrust bearing oil pad according to claim 1, wherein the coordinates of the four monitoring surfaces in the step F are respectively: plane-1 selected coordinates (-144.5,920,25.1), (-144.5,830,25.1) and (-144.5,875,0.0743), plane-2 selected coordinates (-144.5,820,25.1), (-144.5,730,25.1) and (-144.5,775,0.0743), plane-3 selected coordinates (144.5,920,25.1), (144.5,830,25.1) and (144.5,875,0.0995), plane-4 selected coordinates (144.5,820,25.1), (144.5,730,25.1) and (144.5,775,0.0995), in mm.
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