CN108763609A - A kind of design method improving overhead viaduct type Longmen machine tool crossbeam lateral stiffness - Google Patents
A kind of design method improving overhead viaduct type Longmen machine tool crossbeam lateral stiffness Download PDFInfo
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- CN108763609A CN108763609A CN201810248243.5A CN201810248243A CN108763609A CN 108763609 A CN108763609 A CN 108763609A CN 201810248243 A CN201810248243 A CN 201810248243A CN 108763609 A CN108763609 A CN 108763609A
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Abstract
The invention discloses a kind of design methods improving overhead viaduct type Longmen machine tool crossbeam lateral stiffness, belong to overhead viaduct type Longmen machine tool manufacturing field.To the static analysis that overhead viaduct type Longmen machine tool crossbeam has carried out, the dynamic analysis of overhead viaduct type Longmen machine tool, the model analysis of crossbeam；The deformation analysis of the horizontal 0.5g acceleration of crossbeam；The present invention proposes a kind of design method improving overhead viaduct type Longmen machine tool crossbeam lateral stiffness more specifically for the structure of such machine tool beam and the optimization design of reinforcing plate structure.The it is proposed of the invention can reduce the main screw lift of such lathe, improve the lateral stiffness of crossbeam, and then improve the overall stiffness of lathe, final to improve machine cut speed and comprehensive performance.
Description
Technical field
The present invention relates to overhead viaduct type Longmen machine tool manufacturing field, the optimization for also relating to such Longmen machine tool crossbeam is set
Meter field relates more specifically to the design to such lathe solder type beam structure and crossbeam reinforcing plate structure.
Background technology
Gantry machine tool is essential a kind of lathe in process unit.It is mainly used in the processing of heavy parts.Dragon
Gate-type lathe mainly has the characteristics that processing span is big, high in machining efficiency, rigidity is high, is adapted to batch or high-precision is processed.It is navigating
It is widely used in the manufacturings such as sky, space flight, automobile, mold.Crossbeam is one of gantry machine tool important component,
Play a part of connecting the critical components such as slide, saddle, structure and the crossbeam reinforcing plate structure of crossbeam itself determine itself
Dynamic and static characteristic, so the dynamic and static characteristic of crossbeam gusset is directly related to the overall performance of gantry machine tool again.It improves
Processing efficiency, the precision of such lathe, it is necessary to the dynamic and static characteristic for considering machine tool beam and crossbeam reinforcing plate structure, due to lathe
The start and stop, acceleration of crossbeam can generate prodigious active force in the transverse direction of crossbeam during the work time, in order to improve the essence of lathe
Degree, it is therefore desirable to improve the lateral stiffness of crossbeam.
Gantry Machining Center beam force be beam simply support at each end supporting form, the power that crossbeam is born have crossbeam itself,
The dead weight of ram, slide carriage, main shaft etc., in addition, still suffering from toppling of being generated due to the suspension of spindle box etc. and torsional moment.
The crossbeam bending resistance of different reinforcing plate structures, anti-twisting property are different.The effect of gusset is that local load is passed to other sidings, to
Entire supporting member is set to bear load relatively uniformly, longitudinal baffle can improve bending stiffness, and lateral partitions can improve antitorque rigid
Degree.Therefore rational beam structure and crossbeam reinforcing plate structure must be selected, to improve bending resistance, the anti-twisting property of crossbeam.
Nowadays, the problem analysis of related lathe or transverse beam rigidity has been carried out in many research work.Both at home and abroad in machine
Finite element method is mainly used in terms of bed research, Structural Static, dynamic stiffness and dynamic stability are assessed, comparative analysis
The beam structure of different cross section obtains rigidity more preferably beam structure.The present invention is the effect according to gusset, in certain overhead viaduct type
Gusset is arranged inside the crossbeam of Longmen machine tool, and static and dynamic performance analysis has been carried out to crossbeam with FInite Element.Finally determine this hair
Solder type beam structure and crossbeam the reinforcing plate structure design of bright overhead viaduct type Longmen machine tool are more reasonable, rigidity, dynamic characteristic
Etc. comprehensive performances it is more preferable, it is more meaningful to the manufacture of such lathe.
Invention content
The purpose of the present invention is being directed to overhead viaduct type Longmen machine tool (Fig. 1), which is cross beam movement, and workbench is fixed
Structure, the structure include workbench, lathe bed, crossbeam, saddle, ram, hydraulic system, lubricating system, cold filtration system, chip removal
The components such as device, rotary operation panel and electric-control system, middle cross beam are the structure members of lathe key.Lathe takes up an area face
The features such as product is small, workbench load-bearing is big, easy to use, high degree of automation.
To achieve the above object, this method use is as follows：A kind of raising overhead viaduct type Longmen machine tool crossbeam
The design method of lateral stiffness, step 1：Overhead viaduct type Longmen machine tool crossbeam static analysis；
Three-dimensional modeling is carried out to overhead viaduct type Longmen machine tool crossbeam first, because crossbeam integrally uses welding structure, in order to
The problem of meeting welding structure insufficient rigidity, has thickeied the wall thickness of beam structure front and rear sides first, and secondly, design is cut with crossbeam
The parallel and vertical gusset in face (Fig. 2).Established threedimensional model is imported into finite element analysis software ANSYS Workbench
In.Statics Analysis is carried out to it.Crossbeam material is steel Q235, and slide carriage and ram material are gray cast iron HT300, are used
Solid186 units carry out mesh generation, and unit size is set as 50mm.
Constraints is arranged in simulation crossbeam real working condition：Crossbeam both ends are carried out with vertical direction Z-direction at slide contact surface
Constraint.Cylindrical coordinate is added at the position that motor is installed in crossbeam one end, by horizontal Y-direction, that is, cylindrical coordinates X to constraining.Crossbeam
Other end symmetric position bound level Y-direction.These three constraint types can ensure that crossbeam static analysis accurately solves.
When ram and slide carriage, which are assemblied in movable type, determines diplodocus doorframe medium position, vertical force limit feelings suffered by crossbeam are simulated
Under condition static(al) deformation, analyze its vertical Z to maximum deformation quantity.
Step 2：The dynamic analysis of overhead viaduct type Longmen machine tool crossbeam；
Step 2.1：The model analysis of overhead viaduct type Longmen machine tool crossbeam；
It is inadequate that the characteristic of crossbeam is only analyzed in terms of static(al), needs further to analyze its dynamic characteristic.Certainly to crossbeam
It is analyzed by mode, since former rank intrinsic frequencies of crossbeam influence crossbeam performance maximum, the designed cross of this method selection
First three rank mode of beam, and then obtain its intrinsic frequency.
Step 2.1：The deformation analysis of overhead viaduct type Longmen machine tool crossbeam transverse direction 0.5g acceleration；
Crossbeam is required to need to run close under 0.5g acceleration according to machine tool capability, the case where not considering crossbeam dead weight
The stead deformation of beam structure under lower analysis 0.5g constant acceleration limiting cases.One is directly acted in crossbeam horizontal direction
The 0.5g constant accelerations field of force, simulation crossbeam is in 0.5g acceleration start-up courses, and acceleration changes to 0.5g from zero suddenly, in level side
To deformation.Whether deflection meets performance requirement to analysis crossbeam in the limiting case.
Compared with prior art, the present invention is more specifically for the excellent of such machine tool beam structure and crossbeam reinforcing plate structure
Change design, proposes a kind of design method improving overhead viaduct type Longmen machine tool crossbeam lateral stiffness.The it is proposed of the invention can reduce
The main screw lift of such lathe improves the lateral stiffness of crossbeam, and then improves the overall stiffness of lathe, finally improves machine cut
Speed and comprehensive performance.
Description of the drawings
Fig. 1 overhead viaduct type Longmen machine tool complete machine structure schematic diagrames.
Fig. 2 crossbeam cross-sectional structure schematic diagrames.
The structural schematic diagram normal axomometric drawing of Fig. 3 crossbeam gussets.
Fig. 4 crossbeam appearance diagrams.
Specific implementation mode
Below in conjunction with drawings and examples, the present invention will be described in further detail.
Step 1：The static analysis of overhead viaduct type Longmen machine tool crossbeam；
By the threedimensional model of the overhead viaduct type Longmen machine tool crossbeam of foundation, as shown in figure 4, related transverse beam rigidity formula is as follows
It is shown：
Indicate windup-degree；T indicates that torque, l indicate the length of machine tool beam；
GI=G β hb3Referred to as torsional rigidity；
β is also coefficient related with ratio h/b；
EI is the bending stiffness of beam,For the curvature after beam axis deformation；
The deformation of crossbeam, mainly bending deform.And bending stiffness, torsional rigidity are all the functions of cross sectional moment of inertia, with
The increase of section of beam the moment of inertia and increase.Longitudinal baffle can improve bending stiffness, and lateral partitions can improve torsional rigidity.Because
Crossbeam integrally uses welding structure, the problem of in order to meet welding structure insufficient rigidity, devise the muscle parallel with section of beam
Plate is outer (Fig. 3), and the thickness of lateral gusset is 60mm, and the thickness of longitudinal gusset is 10mm.The shape of lateral gusset as shown in Fig. 2,
The shape of longitudinal gusset and position are as shown in Figure 2.It imported into finite element analysis software ANSYSWorkbench.Crossbeam material is
Steel Q235, slide carriage and ram material are gray cast iron HT300, and material parameter is：Elasticity modulus：130GPa, Poisson's ratio：0.25,
Density：7300kg/m3.By the way of free mesh, mesh generation is carried out using Solid186 units, unit size is set
It is set to 50mm.Constraints is arranged in simulation crossbeam real working condition：Crossbeam both ends are carried out with vertical direction Z-direction at slide contact surface
Constraint.Cylindrical coordinate is added at the position that motor is installed in crossbeam one end, by horizontal Y-direction, that is, cylindrical coordinates X to constraining.Crossbeam
Other end symmetric position bound level Y-direction.These three constraint types can ensure that crossbeam static analysis accurately solves.
When ram and slide carriage, which are assemblied in movable type, determines diplodocus doorframe medium position, vertical force limit feelings suffered by crossbeam are simulated
Under condition static(al) deformation, analyze its vertical Z to maximum deformation quantity.
Step 2：The dynamic analysis of overhead viaduct type Longmen machine tool crossbeam；
Step 2.1：The model analysis of crossbeam；
It is far from being enough that the characteristic of crossbeam is only analyzed in terms of static(al), needs further to analyze its dynamic characteristic.To cross
Beam Free Modal is analyzed, since former rank intrinsic frequencies of crossbeam influence maximum to its performance, so only to this crossbeam
First three rank mode studied.Crossbeam first arrives third rank intrinsic frequency, and can further obtain the bending vibation mode picture of the crossbeam.By
This is it is found that the crossbeam vibration resistance designed of this design method is good.
Step 2.1：The deformation analysis of the horizontal 0.5g acceleration of crossbeam；
Crossbeam is required to need to run close under 0.5g acceleration according to machine tool capability, the case where not considering crossbeam dead weight
The stead deformation of beam structure under lower analysis 0.5g constant acceleration limiting cases.One is directly acted in crossbeam horizontal direction
The 0.5g constant accelerations field of force, simulation crossbeam (acceleration changes to 0.5g from zero suddenly) in 0.5g acceleration start-up courses, in water
Square to deformation.
Higher, the limit acceleration feelings by the dynamic characteristic for calculating solder type overhead viaduct type Longmen machine tool crossbeam known to analysis
Machine tool capability requirement can be met under condition completely, and its technological requirement is not high, convenient for manufacture processing.
Claims (1)
1. a kind of design method improving overhead viaduct type Longmen machine tool crossbeam lateral stiffness, step 1：Overhead viaduct type Longmen machine tool
Crossbeam static analysis；
Three-dimensional modeling is carried out to overhead viaduct type Longmen machine tool crossbeam first, because crossbeam integrally uses welding structure, in order to meet
The problem of welding structure insufficient rigidity, has thickeied the wall thickness of beam structure front and rear sides first, and secondly, design is flat with section of beam
Row and vertical gusset；Established threedimensional model is imported into finite element analysis software ANSYS Workbench；To its into
Row statics Analysis；Crossbeam material is steel Q235, and slide carriage and ram material are gray cast iron HT300, use Solid186 units
Mesh generation is carried out, unit size is set as 50mm；
Constraints is arranged in simulation crossbeam real working condition：Crossbeam both ends are constrained with vertical direction Z-direction at slide contact surface；
Cylindrical coordinate is added at the position that motor is installed in crossbeam one end, by horizontal Y-direction, that is, cylindrical coordinates X to constraining；Crossbeam is another
Hold symmetric position bound level Y-direction；These three constraint types can ensure that crossbeam static analysis accurately solves；
When ram and slide carriage, which are assemblied in movable type, determines diplodocus doorframe medium position, simulate under vertical force limiting case suffered by crossbeam
Static(al) deformation, analyze its vertical Z to maximum deformation quantity；
Step 2：The dynamic analysis of overhead viaduct type Longmen machine tool crossbeam；
Step 2.1：The model analysis of overhead viaduct type Longmen machine tool crossbeam；
It is inadequate that the characteristic of crossbeam is only analyzed in terms of static(al), needs further to analyze its dynamic characteristic；To crossbeam free module
State is analyzed, since former rank intrinsic frequencies of crossbeam influence crossbeam performance on maximum, crossbeam designed by this method selection
First three rank mode, and then obtain its intrinsic frequency；
Step 2.1：The deformation analysis of overhead viaduct type Longmen machine tool crossbeam transverse direction 0.5g acceleration；
It requires crossbeam to need to run close under 0.5g acceleration according to machine tool capability, divides in the case where not considering crossbeam dead weight
Analyse the stead deformation of the beam structure under 0.5g constant acceleration limiting cases；A 0.5g perseverance is directly acted in crossbeam horizontal direction
The acceleration field of force, for simulation crossbeam in 0.5g acceleration start-up courses, acceleration changes to 0.5g, change in the horizontal direction from zero suddenly
Shape situation；Whether deflection meets performance requirement to analysis crossbeam in the limiting case.
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Cited By (2)
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| CN109366195A (en) * | 2018-12-10 | 2019-02-22 | 安德激光智能装备（广东）有限公司 | A kind of crossbeam |
| CN113134690A (en) * | 2021-05-11 | 2021-07-20 | 广东宏石激光技术股份有限公司 | Floor type gantry laser cutting machine beam structure |
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| CN109366195A (en) * | 2018-12-10 | 2019-02-22 | 安德激光智能装备（广东）有限公司 | A kind of crossbeam |
| CN113134690A (en) * | 2021-05-11 | 2021-07-20 | 广东宏石激光技术股份有限公司 | Floor type gantry laser cutting machine beam structure |
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