CN202377856U - Guide rail unloading device for cross beam of large machine tool - Google Patents
Guide rail unloading device for cross beam of large machine tool Download PDFInfo
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- CN202377856U CN202377856U CN2011204889647U CN201120488964U CN202377856U CN 202377856 U CN202377856 U CN 202377856U CN 2011204889647 U CN2011204889647 U CN 2011204889647U CN 201120488964 U CN201120488964 U CN 201120488964U CN 202377856 U CN202377856 U CN 202377856U
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- mount pad
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- cross slide
- load
- guide rail
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Abstract
The utility model relates to the technical field of large machine tools, and in particular relates to a guide rail unloading device for a cross beam of a large machine tool. Action of an unloading cylinder is controlled by the convex side of the upper surface of an unloading beam and an electro-hydraulic proportional pressure valve; and theoretical calculation is carried out to determine that the unloading beam on the cross beam in the whole moving stroke of a transverse slide plate is divided into a plurality compensation intervals; the straightness compensation point collected in experiments and the straightness variation of the compensation intervals are transformed into pressure set values of left and right unloading cylinders; electrical signal values corresponding to the pressure set values of the left and right unloading cylinders are input into the numerical control system of the machine tool, and the electrical signals corresponding to the pressure set values of the left and right unloading cylinders are called by a control system to automatically compensate the straightness error of the transverse slide plate under the transverse slide plate working state, so that the pressure of a support surface of a cross beam reference guide rail is reduced, the stress of the cross beam reference guide rail is uniformly distributed, the cross beam deformation is reduced, and the whole accuracy of machine tool operation is improved.
Description
Technical field
The present invention relates to the heavy duty machine tools technical field, specifically a kind of heavy duty machine tools crossbeam is used guide rail unloading devices.
Background technology
Along with nuclear power, mine, heavy-duty machinery industry product specification continue to increase upgrading, very urgent to demand large-scale, heavy process equipment, large-scale, the heavy-duty of process equipment, many technical problems will occur needs to solve.The deflection compensation of its medium-and-large-sized single-column vertical lathe crossbeam and guide rail off-load are exactly a key technology that needs to be resolved hurrily, and it directly affects the main precision of large-scale single-column vertical lathe.
For satisfying the processing of critical components such as the large-scale vital part pressure vessel of million kilowatt compressed water reactor nuclear power; The special-purpose single-column movement vertical type of super large-scale turnning and milling composite processing machine tool arises at the historic moment; The processing request of, high pulling torque high-power and guarantee machining accuracy for adapting to; The rigidity of overlength cantilever style crossbeam also needs to strengthen greatly; The deadweight of cross slide and ram milling head also significantly increases, and has produced a series of problems thus: one, overlength cantilever (freely-supported) type crossbeam causes the distortion of crossbeam basic rack because deadweight produces deflection deformation; Two, the deadweight of cross slide and ram milling head all is loaded on the basic rack of crossbeam, increases the load of beam guideway, causes the distortion of crossbeam basic rack; When three, lathe moved, along with the increasing of cross slide range ability, the pressure between cross slide and the crossbeam basic rack supporting surface increased, and frictional force strengthens thereupon, has increased the additional load of lathe, made panel wearing and tearing aggravation, influenced the running precision of lathe.
Through retrieval, CN 101462232A has announced that on the net a kind of cross slide uses guide rail unloading devices, it is characterized in that 75 ° of inclined holes are opened on the plane on transverse slide carriage; Through the hold-down nut that is threaded, 15 ° of slant rails of crossbeam processing, insert steel band; The support of bearing is installed in the slide carriage inclined hole, is play the guiding role, the lower end is equipped with self-aligning roller bearing through bearing pin; On the crossbeam steel band, roll, the butterfly spring sheet is installed between upper end and the hold-down nut
This structure is mainly used on the Digit Control Machine Tool of middle-size and small-size crossbeam; Its beneficial effect is the pressure that can reduce the crossbeam basic rack, reduces the panel friction between crossbeam and the cross slide, makes the stressed even distribution of crossbeam; Reduce beam deformation, reduce the cross slide drawing force.Its deficiency is: require crossbeam that enough rigidity are arranged, can not compensate the deflection deformation of crossbeam effectively.
CN 102126158A has announced a kind of off-load beam that on the lathe crossbeam, is equipped with on the net; Off-load beam upper surface is processed as the convex line; Off-load wheel and off-load wheel bascule is installed on knife rest, and the off-load wheel is installed on the eccentric shaft, and the eccentric shaft both sides are provided with bearing; Be provided with little axle at eccentric shaft one end, this little axle contacts with the balanced controls axle; Off-load wheel balanced controls axle is by only in bearing, is provided with spring between its bearing and the off-load wheel balanced controls axle, is provided with shutoff and adjusting device that the balanced controls axle is taken turns in spring and off-load in the end of bearing.
On the present Digit Control Machine Tool, more than two kinds of compensation, unloading way modes employing is all arranged, mode one is mainly used in
Mode two is to use a kind of comparatively widely compensation, unloading way at present, can more efficiently reduce the load that the crossbeam basic rack carries, and improves the linearity that tool-slide moves on crossbeam; Its weak point is: the relief arrangement complex structure, and off-load beam upper surface convex difficulty of processing is bigger; The size of off-load power is to rely on the decrement of spring pretension amount and running medi-spring to decide; Can't be according to the stiffness variation of crossbeam self; Spring pretension amount adjustment operation easier is big, in use, the problem of self-aligning roller bearing damage occurs causing because of off-load power is excessive through regular meeting.
Summary of the invention
The objective of the invention is to solve the weak point of above-mentioned prior art, provide a kind of novel structure, control principle is simple, simple to operate, compensation range is wide, machine tool accuracy is high, the workpiece crudy is high heavy duty machine tools crossbeam to use guide rail unloading devices.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of heavy duty machine tools crossbeam is used relief arrangement, is provided with crossbeam, off-load beam, steel band and cross slide, and cross slide is slidingly connected through guide rail and crossbeam; Off-load beam upper surface is provided with steel band, it is characterized in that being fixed with on the crossbeam between cross slide and the crossbeam off-load beam, and off-load beam upper surface is a convex; Convex is to be joined end to end by flat unit to form, and the principle that is beneficial to approach according to slope is calculated the deflection deformation of off-load beam, and then carries out the compensation deflection deformation; The both sides, cross slide center of corresponding off-load beam upper surface are respectively equipped with relief arrangement, and relief arrangement comprises off-load oil cylinder, electric-hydraulic proportion pressure valve, terminal pad, last mount pad, following mount pad, limiting plate, roller guide piece, dog screw and dish spring, and last mount pad lower surface is provided with spherical; Following mount pad upper surface is provided with the spherical concave surface that matches with last mount pad, and the off-load oil cylinder is fixed on the cross slide, and the piston rod end of off-load oil cylinder is provided with terminal pad; Last mount pad upper end is fixedly connected with piston rod through terminal pad, and matching through the concave surface of spherical with following mount pad in the lower end, and is connected with following mount pad with the dish spring through the dog screw at last mount pad center; The piston rod both sides are provided with limiting plate; Limiting plate is fixed on the cross slide, when off-load beam length direction is advanced, is doing the trace rotation to guarantee down mount pad around the piston rod axle center of off-load oil cylinder, and following mount pad lower end is provided with the roller guide piece; Roller guide piece and steel band are inconsistent; Be beneficial to the roller guide piece and on the steel band of off-load beam, roll, bear heavy load, reduce friction; Improve the precision that cross slide moves linearity; Electric-hydraulic proportion pressure valve one end is connected with the off-load oil cylinder, and the other end is connected with the control system, so that the control system is through the upper cavity pressure of electric-hydraulic proportion pressure valve control off-load oil cylinder; Correct the linearity variation of cross slide, play the effect of crossbeam amount of deflection real-Time Compensation, guide rail off-load.
The present invention can be provided with pilot bushing on cross slide, pilot bushing is enclosed within on the piston rod of off-load oil cylinder, and is fixed on the limiting plate through supporting plate, operates steadily reliably with the piston rod that guarantees the off-load oil cylinder.
Steel band among the present invention is a high rigidity quenching steel band, reaches the effect of bearing heavy load, friction resistant.
Control system among the present invention adopts Siemens 840D system.
The present invention rolls on the off-load beam through the roller guide piece and transmits weight; And process curve through off-load beam upper surface and electric-hydraulic proportion pressure valve control off-load cylinder action, confirm that through Theoretical Calculation the total travel that the off-load beam on the crossbeam moves at cross slide is divided into several compensation spacings; The linearity variation of linearity compensation point of testing collection and compensation spacing is converted into the pressure set points of and arranged on left and right sides off-load oil cylinder; The value of electrical signals that the pressure set points of and arranged on left and right sides off-load oil cylinder is corresponding is input in the digital control system of lathe; Under the cross slide duty; Slide plate is in the spacing of corresponding compensation point, and the corresponding signal of telecommunication of pressure set points of transferring and arranged on left and right sides off-load oil cylinder through the control system comes the straightness error of automatic compensate for lateral slide plate, and the precision that makes compensation back cross slide move linearity obtains bigger raising; Reduced the pressure of crossbeam basic rack supporting surface; Make the stressed even distribution of crossbeam basic rack, reduce beam deformation, improved the overall precision of lathe operation.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is the cutaway view of A-A among Fig. 1.
Fig. 3 is an off-load cylinder structure sketch map.
Fig. 4 is an off-load oil cylinder hydraulic schematic diagram.
Fig. 5 is the structural representation of off-load beam upper surface.
Reference numeral: 1. crossbeam, 2. off-load beam, 3. steel band, 4. cross slide, 5. off-load oil cylinder, 6. terminal pad; 7. go up mount pad, 8. descend mount pad, 9. dog screw, 10. butterfly spring, 11. limiting plates; 12. the roller guide piece, 13. pilot bushings, 14. supporting plates, 15. flat units, 16. piston rods.
The specific embodiment
Below in conjunction with accompanying drawing the present invention is further specified:
Shown in accompanying drawing, a kind of heavy duty machine tools crossbeam is used guide rail unloading devices, is provided with crossbeam 1, off-load beam 2, steel band 3 and cross slide 4; Cross slide 4 is slidingly connected through guide rail and crossbeam 1, and off-load beam 2 upper surfaces are provided with steel band 3, it is characterized in that being fixed with off-load beam 2 on the crossbeam 1 between cross slide 4 and the crossbeam 1; Off-load beam 2 upper surfaces are convex, and convex is to be joined end to end by flat unit 15 to form, and the principle that is beneficial to approach according to slope is calculated the deflection deformation of off-load beam 2; And then carry out the compensation deflection deformation, and the both sides, cross slide 4 center of corresponding off-load beam 2 upper surfaces are respectively equipped with relief arrangement, and relief arrangement comprises off-load oil cylinder 5, electric-hydraulic proportion pressure valve, terminal pad 6, last mount pad 7, following mount pad 8, limiting plate 11, roller guide piece 12, dog screw 9 and dish spring 10; Last mount pad 7 lower surfaces are provided with spherical, and following mount pad 8 upper surfaces are provided with the spherical concave surface that matches with last mount pad, and off-load oil cylinder 5 is fixed on the cross slide 4; Piston rod 16 ends of off-load oil cylinder 5 are provided with terminal pad 6, and last mount pad 7 upper ends are fixedly connected with piston rod 16 through terminal pad 6, match through the concave surface of spherical with following mount pad 8 in the lower end; And be connected with following mount pad 8 with dish spring 10 through the dog screw 9 at last mount pad 7 centers, piston rod 16 both sides are provided with limiting plate 11, and limiting plate 11 is fixed on the cross slide 4;, doing off-load beam 2 length directions the trace rotation to guarantee down mount pad 8 when advancing around piston rod 16 axle center of off-load oil cylinder 5; Following mount pad 8 lower ends are provided with roller guide piece 12, and roller guide piece 12 is inconsistent with steel band 3, is beneficial to roller guide piece 12 and on the steel band 3 of off-load beam 2, rolls; Bear heavy load; Reduce friction, improve the precision that cross slide 4 moves linearity, electric-hydraulic proportion pressure valve one end is connected with off-load oil cylinder 5; The other end is connected with the control system; So that the control system passes through the upper cavity pressure of electric-hydraulic proportion pressure valve control off-load oil cylinder 5, the linearity variation of correcting cross slide 4 plays the effect of crossbeam 1 amount of deflection real-Time Compensation, guide rail off-load.
The present invention can be provided with pilot bushing 13 on cross slide 4, pilot bushing 13 is enclosed within on the piston rod 16 of off-load oil cylinder 5, and is fixed on the limiting plate 11 through supporting plate 14, operates steadily reliably with the piston rod 16 that guarantees off-load oil cylinder 5.
Control system among the present invention can preferably adopt Siemens 840D system, and Siemens 840D system is a prior art, and this does not give unnecessary details.
Heavy duty machine tools crossbeam of the present invention is with the operation principle of guide rail unloading devices: two off-load oil cylinder 5 epicoeles that are installed in cross slide 4 center line both sides to symmetry feed hydraulic oil; The piston rod 16 of off-load oil cylinder 5 moves downward; Drive is installed in terminal pad 6 on the piston rod 16, goes up mount pad 7, mount pad 8, spherical guide piece 12 move downward together down; Contact with steel band 3 on the off-load beam 2 until roller guide piece 12, and bear enough load, make crossbeam 1 basic rack stressed evenly; The plane processing that the convex of off-load beam 2 upper surfaces links to each other according to plurality of sections; Can compensate the deflection deformation of crossbeam 1, mount pad 8 matches through spherical and concave surface under last mount pad 7 machines, is connected with dish yellow 10 with dog screw 9 with following mount pad 8 centers at last mount pad 7; Limiting plate 11 is installed on cross slide 4; Guarantee down mount pad 8 only with around the angular error of off-load oil cylinder 5, thereby guarantee that cross slide 4 can move along crossbeam 1 basic rack accurately in different curvature compensation spacing, when cross slide 4 when crossbeam 1 basic rack moves; Because the gravity of crossbeam 1 self and cross slide 4, ram assembly is to the influence of crossbeam 1; Deflection deformation can take place in crossbeam 1 basic rack, and deflection can be big and become big along with the change of cross slide 4 strokes, at this moment can reach the purpose of regulating off-load power size through the force value that the control of electric-hydraulic proportion pressure valve feeds the hydraulic oil of left and right off-load oil cylinder 5 epicoeles; Thereby the error that the real-time change that realizes heavy duty machine tools crossbeam 1 off-load power size is proofreaied and correct cross slide 4 linearitys is converted into the pressure set points of and arranged on left and right sides off-load oil cylinder through test linearity compensation point of gathering and the linearity variation that compensates spacing; The value of electrical signals that the pressure set points of and arranged on left and right sides off-load oil cylinder 5 is corresponding is input in the digital control system of lathe; Under cross slide 4 duties; Cross slide 4 is in the spacing of corresponding compensation point, and the corresponding signal of telecommunication of pressure set points of transferring and arranged on left and right sides off-load cylinder 5 through system comes the straightness error of automatic compensate for lateral slide plate 4.The precision that makes compensation back cross slide 4 move linearity obtains bigger raising.
The present invention is owing to adopt said structure; Simple in structure, control principle is simple, and the signal of telecommunication of transferring the pressure set points of and arranged on left and right sides off-load cylinder through system comes the straightness error of automatic compensate for lateral slide plate; The precision and the scope that make compensation back cross slide move linearity obtain bigger raising; Machine tool accuracy is higher, and on 22 meters single-column vertical lathes of Φ, uses, and the linearity that cross slide moves is 0.01mm at the 1250mm place; When the cross slide range, be 0.05mm when (9250mm), finally improved the crudy of the overall precision and the workpiece of lathe greatly.
Claims (3)
1. a heavy duty machine tools crossbeam is used guide rail unloading devices, is provided with crossbeam, off-load beam, steel band and cross slide, and cross slide is slidingly connected through guide rail and crossbeam; Off-load beam upper surface is provided with steel band, it is characterized in that being fixed with on the crossbeam between cross slide and the crossbeam off-load beam, and off-load beam upper surface is a convex; Convex is to be joined end to end by flat unit to form, and the both sides, cross slide center of corresponding off-load beam upper surface are respectively equipped with relief arrangement, and relief arrangement comprises off-load oil cylinder, electric-hydraulic proportion pressure valve, terminal pad, last mount pad, following mount pad, limiting plate, roller guide piece, dog screw and dish spring; Last mount pad lower surface is provided with spherical, and following mount pad upper surface is provided with the spherical concave surface that matches with last mount pad, and the off-load oil cylinder is fixed on the cross slide; The piston rod end of off-load oil cylinder is provided with terminal pad; Last mount pad upper end is fixedly connected with piston rod through terminal pad, and matching through the concave surface of spherical with following mount pad in the lower end, and is connected with following mount pad with the dish spring through the dog screw at last mount pad center; The piston rod both sides are provided with limiting plate; Limiting plate is fixed on the cross slide, and following mount pad lower end is provided with the roller guide piece, and roller guide piece and steel band are inconsistent; Electric-hydraulic proportion pressure valve one end is connected with the off-load oil cylinder, and the other end is connected with the control system.
2. a kind of heavy duty machine tools crossbeam according to claim 1 is used guide rail unloading devices, it is characterized in that cross slide is provided with pilot bushing, and pilot bushing is enclosed within on the piston rod of off-load oil cylinder, and is fixed on the limiting plate through supporting plate.
3. a kind of heavy duty machine tools crossbeam according to claim 2 is used guide rail unloading devices, it is characterized in that steel band is a high rigidity quenching steel band.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204889647U CN202377856U (en) | 2011-11-30 | 2011-11-30 | Guide rail unloading device for cross beam of large machine tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204889647U CN202377856U (en) | 2011-11-30 | 2011-11-30 | Guide rail unloading device for cross beam of large machine tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202377856U true CN202377856U (en) | 2012-08-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204889647U Expired - Fee Related CN202377856U (en) | 2011-11-30 | 2011-11-30 | Guide rail unloading device for cross beam of large machine tool |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202377856U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102581687A (en) * | 2011-11-30 | 2012-07-18 | 威海华东数控股份有限公司 | Guide track unloading device for crossbeam of large-sized machine tool and deflection compensation method |
| CN102862062A (en) * | 2012-09-29 | 2013-01-09 | 柳州正菱重型数控机床有限公司 | Cross beam reset clamping device |
-
2011
- 2011-11-30 CN CN2011204889647U patent/CN202377856U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102581687A (en) * | 2011-11-30 | 2012-07-18 | 威海华东数控股份有限公司 | Guide track unloading device for crossbeam of large-sized machine tool and deflection compensation method |
| CN102862062A (en) * | 2012-09-29 | 2013-01-09 | 柳州正菱重型数控机床有限公司 | Cross beam reset clamping device |
| CN102862062B (en) * | 2012-09-29 | 2014-08-27 | 柳州正菱重型数控机床有限公司 | Cross beam reset clamping device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120815 Termination date: 20161130 |
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| CF01 | Termination of patent right due to non-payment of annual fee |