CN203292950U - Micro-gap compensation system for square ram of gantry machining center - Google Patents
Micro-gap compensation system for square ram of gantry machining center Download PDFInfo
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- CN203292950U CN203292950U CN2013203445116U CN201320344511U CN203292950U CN 203292950 U CN203292950 U CN 203292950U CN 2013203445116 U CN2013203445116 U CN 2013203445116U CN 201320344511 U CN201320344511 U CN 201320344511U CN 203292950 U CN203292950 U CN 203292950U
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Abstract
The utility model provides a micro-gap compensation system for a square ram of a gantry machining center. The micro-gap compensation system is formed by a gap compensation execution device, a pressure control system and an electrical control module. For solving the problems that due to the fact that the square ram of the gantry machining center enables a sliding guide rail to be used, micro-gaps exist, the supporting rigidity of the square ram is reduced when the square ram extends out, the machining accuracy of a machine tool is reduced when the machine tool is used for machining, a cutter vibrates, and the machining quality of the surfaces of parts is reduced, the micro-gap compensation system for compensating the micro-gaps in a self-adaption mode according to Z axis feeding coordinate signals of the square ram is provided. Field debugging shows that the micro-gap compensation system can effectively improve the supporting rigidity of the ram of the machine tool, improves the machining quality of the surfaces of the parts of the machine tool, and meanwhile has a certain compensation effect on the positioning accuracy of the machine tool.
Description
Technical field
The present invention relates to the machine tool accuracy bucking-out system, especially a kind of be used to compensating the microgap bucking-out system of gantry machining center side's ram rail plate.
Background technology
In the heavy process equipments such as large-sized gantry numerical control machining center, vertical turning center, numerical control floor type boring and milling machine, square ram and saddle structure are one of important composition structures.Ram (Ram) is that the parts such as knife rest or main spindle box are housed, and have guide rail can move on lathe bed or miscellaneous part pillow functional part, and the guide rail of square ram is exactly himself substantially.The ram of existing heavy process equipment generally adopts the square ram structure form, with square ram, refines the formation guide pass on four sides, with the saddle inner surface, forms the sliding friction guideway, and accompanies by hydrodynamic lubrication or oil lubrication.The microgap that sliding friction pair exists, to form lubricating oil film, the precondition of the side's of being beneficial to ram movement, meanwhile, the existence of microgap is also the key factor that affects ram and saddle fit structure, when microgap is too small, can make borderline oil film break, frictional resistance significantly rises, thereby occurs that Digit Control Machine Tool Z axis feeding positioning precision descends, the aggravation of low speed jerking motion phenomenon, the even bad phenomenon such as locking of smooth, unstable wear of sliding; And when microgap is excessive, contact stiffness between ram and saddle weakens greatly, thereby cause the problems such as processing is trembled, the out-of-flatness of part finished surface, meanwhile, gap width δ itself is the factor of influence of machine finish, and being accompanied by stretching out of ram, gap width δ is amplified at double on the impact of positioning precision, thereby causes the positioning precision of lathe, repetitive positioning accuracy to reduce.
Based on above-mentioned analysis, the control of the microgap value between square ram and saddle structure, play an important role for the overall performance that promotes lathe, machining accuracy etc.The concrete analysis of the assembly structure form between side's ram and saddle, helping to deepen the other side's ram microgap forms the understanding of reason and proposes a kind of rationally effectively compensation method, concrete assembly structure for square ram and saddle, refer to Figure of description 1 and 2, analysis for concrete structure, be further described in detail hereinafter at specification.
Summary of the invention
In order to overcome gantry machining center side's ram, adopt rail plate to exist microgap, when the side's of causing ram stretched out, support stiffness descended, degradation problem under machining accuracy decline while causing machine tooling, vibration cutting, piece surface crudy, the present invention proposes a kind of according to square ram Z axis feeding coordinate signal and the microgap bucking-out system of adaptive equalization microgap.
The technical solution adopted for the present invention to solve the technical problems is:
a kind of gantry machining center side ram microgap bucking-out system, by the backlash compensation actuating unit, control pressurer system and electric control module form, it is characterized in that, described backlash compensation actuating unit comprises eight backlash compensation actuators, described backlash compensation actuator is fixed on the little gradient wedge shape installed surface of sliding saddle of machine tool by contiguous block, described backlash compensation actuator is provided with M Circular Thin pressure structure, described Circular Thin pressure structure comprises the elastic springing thin-walled, the pressurization oil pocket, end cap and sealing device, described elastic springing thin-walled is arranged on the front end face of backlash compensation actuator, described control pressurer system is by the plunger type pressure adjusting structure, pressure sensor, drive motors forms, described plunger type pressure adjusting structure comprises cylinder body, plunger, guide rail structure, trapezoidal screw transmission mechanism and support, described cylinder body is fixed on support, in described cylinder body, have the cavity volume hole, front end face has oil-out, described plunger bushing is contained in the cavity volume hole of described cylinder body, between described plunger and described cylinder body, be provided with dynamic sealing device, described guide rail structure comprises the pull bar guide rail, nut connecting plate and lining, described trapezoidal screw transmission mechanism comprises trapezoidal screw axle and feed screw nut, described drive motors seesaws by described trapezoidal screw transmission mechanism and described guide rail structure actuation plunger, described pressure sensor is fixed on described cylinder body, described control pressurer system is loaded into hydraulic oil in the pressurization oil pocket of eight backlash compensation actuators by the bleed off circuit piece, described electric control module comprises pressure feedback control module and lathe Z axis feeding coordinate signal unit.
Further, the position that described backlash compensation actuator is installed is the fixed position that the wedge shape filler rod is adjusted in original gap, described backlash compensation actuator is little gradient wedge, the front end face of described backlash compensation actuator is plane, for the ram contact-making surface, the rear end face of described backlash compensation actuator is inclined-plane, and is corresponding with the little gradient wedge shape installed surface on saddle; On described backlash compensation actuator, Circular Thin pressure structure is set, the elastic springing thin-walled of described Circular Thin pressure structure is arranged on the front end face of backlash compensation actuator, on described end cap, have the sealing ring deep gouge, mounting O-shaped sealing ring in described sealing ring deep gouge, described end cap is fixed by screws in the counterbore of backlash compensation actuator rear end face, form the pressurization oil pocket, the thickness of described end cap does not exceed the rear end face of backlash compensation actuator; The laminating processing of described backlash compensation actuator front end face, be provided with oil cavity on laminating; In described backlash compensation actuator, be provided with pressurization oil circuit and lubricant passage way.
Further again, the side of cylinder block of described control pressurer system is provided with oil-in, the oiling pipeline of auxiliary oiling device is repeatedly kicked on the oil-in of described cylinder body by check valve, the front end face of described cylinder body has oil-out, and the flowline of described cylinder body is connected with the pressurization oil pocket of eight backlash compensation actuators through the bleed off circuit piece; Described plunger bushing is contained in the cavity volume hole of described cylinder body and can seesaws, and on the outer ring surface of described plunger, have sealing ring deep gouge is installed, but described sealing ring is installed deep gouge mounting O-shaped sealing ring and is coordinated back-up ring or the lip-type packing of Y type is installed; Described guide rail structure comprises pull bar guide rail, nut connecting plate and lining, described nut connecting plate can drawn described pull bar guide rail by described lining and seesawed, described trapezoidal screw transmission mechanism comprises trapezoidal screw axle and feed screw nut, described trapezoidal screw axle rotatably is fixed on support by bearing, the trapezoidal screw section of described trapezoidal screw axle and described feed screw nut's engaged transmission, the rear end of described plunger and described feed screw nut are fixed on described nut connecting plate; Described drive motors is fixed on the base plate of support, and the output shaft of described drive motors is connected with described trapezoidal screw axle by shaft coupling.
As a kind of preferred scheme: the support of described control pressurer system comprises base plate, front vertical plate, back vertical plate, and described pull bar guide rails assembling, in the pull bar guide rail hole of described front vertical plate and back vertical plate, and is joined with bolts on support; The rear end face of described cylinder body can be equipped with cylinder end caps, in described cylinder end caps, is provided with the dust ring mounting groove, in described dust ring mounting groove, settles C type dust ring; In the rear end face of described plunger, also be provided with the unsettled hole of trapezoidal screw; The trapezoidal screw section of described trapezoidal screw axle and described feed screw nut's engaged transmission, in the unsettled hole of trapezoidal screw that the unsettled trapezoidal screw that stretches out of described feed screw nut's front end is carried on described plunger.
As preferred another kind of scheme: described backlash compensation actuator is fixed on the little gradient wedge shape installed surface of sliding saddle of machine tool by contiguous block, on described contiguous block, be provided with backlash compensation actuator attachment screw hole, fixing screw hole, gap adjustment screwed hole, described backlash compensation actuator is fixed on the backlash compensation actuator installed surface of described contiguous block by backlash compensation actuator attachment screw hole, described contiguous block is fixed on saddle by fixing screw hole, makes the rear end face of backlash compensation actuator overlap with the little gradient wedge shape installed surface on saddle; On described contiguous block, also be provided with pressurization oil duct oil-in, oil leab oil-in, on the backlash compensation actuator installed surface of described contiguous block, be provided with pressurization oil duct sealing ring deep gouge and oil leab sealing ring installation deep gouge are installed.
As preferred another scheme: on described backlash compensation actuator, be provided with pressurization oil duct and oil leab, described pressurization oil duct connects the pressurization oil pocket of M Circular Thin pressure structure on the backlash compensation actuator, described oil leab has copper pipe deep gouge is installed in the side of backlash compensation actuator, at described copper pipe, buried tube type in deep gouge is installed copper pipe is installed, described copper pipe realizes that oil leab is from nearly oil-in end to the linking away from the oil-in end, and the oil-out of described oil leab is opened on the oil cavity of laminating of backlash compensation actuator.
As preferred another scheme: three Circular Thin pressure structures are set to described backlash compensation actuator equal intervals.
As preferred another scheme: described electric control module comprises pressure feedback control module and lathe Z axis feeding coordinate signal unit, described pressure feedback unit comprises pressure sensor, signal amplifier, data acquisition card, PLC control module, D/A converter and interface arrangement, and described PLC control module is a processing module of Electrical Control of Machinery Tools system; Described lathe Z axis feeding coordinate signal unit is encoder or the grating scale of lathe Z axis feed servo system, lathe Z axis feeding coordinate signal unit provides a Z axis coordinate signal accurately can for described PLC control module in real time, after the PLC control module compares according to the signal of Z axis coordinate signal and pressure sensor feedback, the result of processing is converted into to analog signal by D/A converter, for the operation of controlled pressure control system drive motors.
Beneficial effect of the present invention is embodied in:
For gantry machining center side's ram, adopt rail plate to exist microgap, when the side's of causing ram stretched out, support stiffness descended, degradation problem under machining accuracy decline while causing machine tooling, vibration cutting, piece surface crudy, proposed a kind of according to square ram Z axis feeding coordinate signal and the microgap bucking-out system of adaptive equalization microgap, the field adjustable explanation, this system can effectively improve the machine ram support stiffness, improve the piece surface crudy of lathe, simultaneously Machine Tool Positioning Accuracy is had to certain compensation effect.
The accompanying drawing explanation
Fig. 1 is gantry machining center ram saddle assembly structure schematic diagram
Fig. 2 is the structural representation that wedge shape filler rod and saddle are adjusted in gantry machining center ram, gap
Fig. 3 is backlash compensation actuating unit structural representation of the present invention
Fig. 4 is the structure chart of backlash compensation actuator of the present invention and contiguous block
Fig. 5 is the structure chart (another is attempted) of backlash compensation actuator of the present invention and contiguous block
Fig. 6 is the structure perspective view of backlash compensation actuator of the present invention and contiguous block
Fig. 7 is the structure chart of control pressurer system of the present invention
Fig. 8 is the cutaway view of control pressurer system of the present invention
Fig. 9 is control pressurer system plunger of the present invention, nut connecting plate, feed screw nut's assembly structure schematic diagram
Figure 10 is invention backlash compensation actuator Circular Thin pressure structure cutaway view
Figure 11 is that the control of control pressurer system of the present invention and electric control module concerns flow chart
The specific embodiment
In conjunction with Fig. 1～Figure 11, before the embodiment that introduces gantry machining center side of the present invention ram microgap bucking-out system, paper gantry machining center square ram structure, assembly relation and square ram rail plate clearance adjustment method.
Ram and saddle structure adopt the rail plate fit form, and its concrete structure is as follows: by reference to the accompanying drawings 1,2, and square ram 1 is arranged in saddle 101, and is fixing with cover plate 102, forms the completely encircle structure.Ram sliding friction on the mating surface of saddle, have four guide supporting faces, and two face fine grindings are wherein arranged on saddle, for datum level, and coordinate with these two faces, form two other face of shape of encircling, namely the working face on another side and cover plate on saddle, be gap adjustment face.In existing lathe mounting technology, the microgap value δ when adjusting the wedge shape filler rod and adjust machine ram and slide by gap, this microgap value δ becomes one of restraining factors that affect machine finish.The original gap of ram rail plate is adjusted, and generally adopts at present the artificial method of adjusting, and after being assembled to ram on saddle, cover plate is assembled locked.Ram exists certain ，Yong gap, gap adjustment wedge shape filler rod 104 to carry out trace adjustment in saddle inside, main basis for estimation is the resistance to sliding of ram under hydrodynamic lubrication.Concrete method of adjustment and operation principle are shown in accompanying drawing 2, by the adjustment screw on contiguous block 3, make gap adjust wedge shape filler rod 104 and slide on the little gradient wedge shape installed surface 103 of saddle, and the adjusting play size, and amount of taper is 1:100.Original gap, in case adjustment completes, just can not change.Therefore microgap value δ namely completes gap and adjusts after wedge shape filler rod 104 is adjusted the gap that forms.
After having introduced the assembly structure of traditional gantry machining center ram, introduce by reference to the accompanying drawings microgap of the present invention bucking-out system.
A kind of gantry machining center side ram microgap bucking-out system, consist of backlash compensation actuating unit, control pressurer system and electric control module.
described backlash compensation actuating unit comprises eight backlash compensation actuators 2, described backlash compensation actuator 2 is fixed on the little gradient wedge shape installed surface 103 of sliding saddle of machine tool by contiguous block 3, the position that described backlash compensation actuator is installed is the fixed position that wedge shape filler rod 104 is adjusted in original gap, from design angle, say, described backlash compensation actuator 2 is to adjust on wedge shape filler rod 104 contour structures bases in original gap, carry out the redesign process of the contents such as the innovative design of Circular Thin pressure structure and material, described backlash compensation actuator 2 is little gradient wedge, the front end face of described backlash compensation actuator is plane, for the ram contact-making surface, the rear end face of described backlash compensation actuator is inclined-plane, corresponding with the little gradient wedge shape installed surface 103 on saddle.
on described backlash compensation actuator, be provided with three Circular Thin pressure structures, described Circular Thin pressure structure comprises elastic springing thin-walled 2-12, pressurization oil pocket 2-4, end cap 2-1 and sealing device, described elastic springing thin-walled 2-12 is arranged on the front end face of backlash compensation actuator, on described end cap 2-1, have the sealing ring deep gouge, the one O RunddichtringO 2-13 is installed in described sealing ring deep gouge, described end cap is fixed by screws in the counterbore of backlash compensation actuator rear end face, form pressurization oil pocket 2-4, the thickness of described end cap does not exceed the rear end face of backlash compensation actuator, it is installed surface according to the rear end face that is described backlash compensation actuator, if ending cover thickness has surpassed rear end face, can affect the normal mounting of backlash compensation actuator.The laminating processing of described backlash compensation actuator front end face, be provided with oil cavity 2-11 on laminating; In described backlash compensation actuator, be provided with pressurization oil circuit 2-6 and lubricant passage way 2-7.
described backlash compensation actuator is fixed on the little gradient wedge shape installed surface of sliding saddle of machine tool by contiguous block 3, on described contiguous block, be provided with backlash compensation actuator attachment screw hole, fixing screw hole, screwed hole is adjusted in gap, described backlash compensation actuator is fixed on the backlash compensation actuator installed surface of described contiguous block by backlash compensation actuator attachment screw hole, described contiguous block 3 is fixed on saddle by fixing screw hole, make the rear end face of backlash compensation actuator overlap with the little gradient wedge shape installed surface on saddle, original gap while adjusting the adjustment screw adjustment side ram assembling on screwed hole by gap, operation principle describes in detail hereinbefore.On described contiguous block, also be provided with pressurization oil duct oil-in 2-2, oil leab oil-in 2-5, on the backlash compensation actuator installed surface of described contiguous block, be provided with pressurization oil duct sealing ring deep gouge 2-8 and oil leab sealing ring installation deep gouge 2-9 are installed.
On described backlash compensation actuator, be provided with pressurization oil duct 2-6 and oil leab 2-7, described pressurization oil duct connects the pressurization oil pocket 2-4 of three Circular Thin pressure structures on the backlash compensation actuator, after the hydraulic oil of control pressurer system is connected to the pressurization oil duct oil-in 2-2 on described contiguous block 3 by the bleed off circuit piece, after internal pipeline, end face seal, enter pressurization oil duct 2-6, realize the adjusting of compressed oil intraluminal fluid force feed force value.described oil leab 2-7 has copper pipe deep gouge 2-3 is installed in the side of backlash compensation actuator, at described copper pipe, buried tube type in deep gouge is installed copper pipe is installed, described copper pipe realizes that oil leab is from nearly oil-in end to the linking away from the oil-in end, the oil-out 2-10 of described oil leab opens on the oil cavity 2-11 of laminating of backlash compensation actuator, the fuel-displaced pipeline of grease pump is connected to oil leab oil-in 2-5, through internal pipeline, end face seal, oil leab 2-7, after copper pipe, arrive the oil-out 2-10 of oil leab, the hydrodynamic lubrication of the side's of realization ram movement.In manufacture process, pressurization oil duct and oil leab can not intercommunications.
control pressurer system of the present invention, applied a kind of Pressure Control Technology of micrometeor hydraulic system, described control pressurer system is by the plunger type pressure adjusting structure, pressure sensor 5, drive motors 6 forms, described plunger type pressure adjusting structure comprises cylinder body 4-1, plunger 4-5, guide rail structure, trapezoidal screw transmission mechanism and support, described cylinder body 4-1 is fixed on the front vertical plate 4-3 of support, in described cylinder body, be provided with the cavity volume hole, front end face has oil-out 4-12, described plunger bushing is contained in the cavity volume hole of described cylinder body and can seesaws, between described plunger and described outer cylinder body, be provided with sealing device, described guide rail structure comprises pull bar guide rail 4-9, nut connecting plate 4-7 and lining 4-8, described nut connecting plate 4-7 can draw described pull bar guide rail 4-9 by described lining 4-8 and seesaw, described trapezoidal screw transmission mechanism comprises trapezoidal screw axle 4-10 and feed screw nut 4-6, described trapezoidal screw axle 4-10 rotatably is fixed on the back vertical plate 4-4 of support by bearing, the trapezoidal screw section of described trapezoidal screw axle 4-10 and described feed screw nut's engaged transmission, the rear end of described plunger and described feed screw nut are fixed on described nut connecting plate, described drive motors 6 is fixed on the base plate of support, the output shaft of described drive motors is connected with described trapezoidal screw axle 4-10 by shaft coupling, described pressure sensor 5 is fixed on described cylinder body, and the interface of described pressure sensor oil passage communicates with the molten lumen pore of described cylinder body.
Described control pressurer system is loaded into hydraulic oil in the pressurization oil pocket of eight backlash compensation actuators by the bleed off circuit piece, because system belongs to the micrometeor hydraulic control system, very low to traffic requirement, therefore the oil circuit connecting line adopts pure titanium pipe and special fit to connect.
Specific constructive form for the plunger type pressure adjusting structure, be described below: described support comprises base plate 4-2, front vertical plate 4-3, back vertical plate 4-4, described pull bar guide rail 4-9 is arranged in the pull bar guide rail hole of described front vertical plate and back vertical plate, and be joined with bolts on support, thereby form rigidity support integral body preferably, the ability that this support bears inner tension is better than internal compressive stress far away, is comparatively desirable force structure model; The front and rear end of described back vertical plate has bearing mounting hole, on described bearing mounting hole, bearing is installed, and utilizes bearing (ball) cover that bearing is fixed on back vertical plate, and described trapezoidal screw axle is arranged in above-mentioned bearing; Described drive motors 6 is fixed on the base plate of described support by regulating installing plate.Above-mentioned bearing can be the method to set up of a pair of deep groove ball bearing, and also can be front end is thrust bearing, and rear end is the combination method to set up of deep groove ball bearing.
The side of described cylinder body 4-1 is provided with oil-in, check valve 7 is fixed on described oil-in by jointing, the oil pipe of auxiliary injection system is by cavity volume hole unidirectional communicate of described check valve with described cylinder body, auxiliary injection system can adopt a branch road of Hydraulic Station, after the hydraulic fluid leak in cavity volume, by auxiliary injection system ftercompction.
Described cylinder body 4-1 is revolving body, in described cylinder body, be provided with the cavity volume hole, front end face is provided with oil-out, the upper side of cylinder body front end is provided with pressure sensor installed surface and threaded mounting hole, described pressure sensor is arranged on cylinder body by pressure sensor installed surface and threaded mounting hole, the side of cylinder body is provided with oil-in, and described cavity volume hole, pressure sensor installing hole, oil-in, oil-out communicate by inner oil duct; The rear end of described cylinder body is the flange boss, and described cylinder body is arranged in the cylinder body installing hole of front vertical plate 4-3 and uses screw fastening by the flange boss; Cylinder end caps is fixed the rear end face of described cylinder body by screw, in described cylinder end caps, be provided with the dust ring mounting groove, in described dust ring mounting groove, settles C type dust ring.
Described plunger is stepped revolving body, described plunger 4-5 divides plunger active section and plunger linkage section, described plunger active section is sleeved in the cavity volume hole of described cylinder body, on described plunger active section outer ring surface, be provided with the two seals circle deep gouge is installed, but described sealing ring is installed mounting O-shaped sealing ring in deep gouge and is coordinated back-up ring, and the lip-type packing of Y type also can be installed.Described plunger linkage section is sleeved in feed screw nut's installing hole, and on described plunger linkage section outer ring surface, symmetry has the screw thread fixing hole; The rear end face of described plunger also is provided with the unsettled hole 4-5-1 of trapezoidal screw.
Described nut connecting plate 4-7 two ends are embedded with lining 4-8, and described nut connecting plate center has feed screw nut's mount type hole, and on described nut connecting plate, the two ends vertical with the lining inlaid hole are symmetrically arranged with the first screw thread fixed via; Described feed screw nut's endoporus is divided into two sections of front and back, leading portion is the installing hole of plunger linkage section, back segment is trapezoidal internal thread, described feed screw nut's outer ring surface front end is symmetrically arranged with locating surface, on described locating surface, have the second screw thread fixed via, described feed screw nut is fixed in the mount type hole of described nut connecting plate by locating surface; When the plunger linkage section of described plunger is installed in described feed screw nut's installing hole, when described feed screw nut is installed in the mount type hole of described nut connecting plate, screw thread fixing hole on described the first screw thread fixed via, the second screw thread fixed via and plunger overlaps, utilize nut connecting plate trip bolt 4-11 that the three is fastening, the locating surface that arranges of feed screw nut's outer ring surface front end simultaneously, radially fixing after being conducive to assemble and realize assembling.
Described trapezoidal screw axle 4-10 is multidiameter, and leading portion is the trapezoidal screw section, and stage casing is the bearing construction section, and rear end is the shaft coupling linkage section.Described trapezoidal screw section and feed screw nut's engaged transmission, stretch out in the unsettled hole 4-5-1 of the unsettled trapezoidal screw at described plunger 3 of trapezoidal screw section of feed screw nut's part.Described drive motors is connected with the shaft coupling linkage section of trapezoidal screw axle by shaft coupling, under the effect of drive motors, realize seesawing of plunger, complete and add the decompression process, described drive motors adopts the stepper motor of high pulling torque or the servomotor of high pulling torque.
Described electric control module comprises pressure feedback control module and lathe Z axis feeding coordinate signal unit, described pressure feedback unit comprises pressure sensor, signal amplifier, data acquisition card, PLC control module, D/A converter and interface arrangement, described pressure sensor is technical grade diffuse silicon type pressure transmitter, on described pressure sensor, dispose the oil pressure value display module, described PLC control module is a processing module of Electrical Control of Machinery Tools system; Described lathe Z axis feeding coordinate signal unit is encoder or the grating scale of lathe Z axis feed servo system, lathe Z axis feeding coordinate signal unit provides a Z axis coordinate signal accurately can for described PLC control module in real time, after the PLC control module compares according to the signal of Z axis coordinate signal and pressure sensor feedback, the result of processing is converted into to analog signal by D/A converter, for the operation of controlled pressure control system drive motors.
the operation principle of this embodiment is as follows: the compensation of ram microgap, gantry machining center side, by the backlash compensation actuator, completed, the Circular Thin pressure structure of backlash compensation actuator, under the effect of internal pressure oil, can produce accurately, support stiffness is high, controlled, repeatably micro-distortion, microgap for the side's of compensation ram, Circular Thin pressure structure is out of shape by generation bending elasticity under the internal pressure effect, from the principle angle analysis, be based on elastic properties of materials deformation principle and thin plate minor deflection bending theory, the characteristic of Circular Thin pressure structure generation deflection deformation most critical is mainly by 2 points, first, the deflection deformation compensation rate is directly proportional to internal pressure value, this is the Circular Thin pressure structure controlled basis of actuator by way of compensation, the second, the distortion after the compensation of Circular Thin pressure structure has very high support stiffness, and this is to prevent the machine tooling vibrations, promotes the key factor of lathe cutting ability.For principle and the experimental analysis of Circular Thin pressure structure distortion, specifically do not set forth in the present invention.
The control of backlash compensation actuator Circular Thin pressure structure internal hydraulic pressure oil pressure, by control pressurer system, realized, because this system belongs to the micrometeor hydraulic system, technical solutions according to the invention commonly used realize pressure control, with traditional control pressurer system, compare, have the overflow of preventing waste, avoid that the hydraulic system temperature rise is excessive, the pressure regulation precision accurately, be convenient to the advantage such as assembling maintenance.
And the cooperative cooperating of backlash compensation actuator and control pressurer system is controlled by electric control module.After the lathe field adjustable, can draw out the most suitable compensated curve of Z axis coordinate signal and force value, this compensated curve is the programme controlled core of PLC control system.When lathe is worked, side's ram is fed into a Z axis coordinate signal, the PLC control system can be sent a signal to drive motors, make control pressurer system reach required force value, and force value is by signals collecting, the feedback of pressure sensor, form an effective closed loop, make the pressure regulation precision of control pressurer system more accurate and corresponding quick.
Claims (8)
1. gantry machining center side ram microgap bucking-out system, by the backlash compensation actuating unit, control pressurer system and electric control module form, it is characterized in that, described backlash compensation actuating unit comprises eight backlash compensation actuators, described backlash compensation actuator is fixed on the little gradient wedge shape installed surface of sliding saddle of machine tool by contiguous block, described backlash compensation actuator is provided with M Circular Thin pressure structure, described Circular Thin pressure structure comprises the elastic springing thin-walled, the pressurization oil pocket, end cap and sealing device, described elastic springing thin-walled is arranged on the front end face of backlash compensation actuator, described control pressurer system is by the plunger type pressure adjusting structure, pressure sensor, drive motors forms, described plunger type pressure adjusting structure comprises cylinder body, plunger, guide rail structure, trapezoidal screw transmission mechanism and support, described cylinder body is fixed on support, in described cylinder body, have the cavity volume hole, front end face has oil-out, described plunger bushing is contained in the cavity volume hole of described cylinder body, between described plunger and described cylinder body, be provided with dynamic sealing device, described guide rail structure comprises the pull bar guide rail, nut connecting plate and lining, described trapezoidal screw transmission mechanism comprises trapezoidal screw axle and feed screw nut, described drive motors seesaws by described trapezoidal screw transmission mechanism and described guide rail structure actuation plunger, described pressure sensor is fixed on described cylinder body, described control pressurer system is loaded into hydraulic oil in the pressurization oil pocket of eight backlash compensation actuators by the bleed off circuit piece, described electric control module comprises pressure feedback control module and lathe Z axis feeding coordinate signal unit.
2. gantry machining center side as claimed in claim 1 ram microgap bucking-out system, it is characterized in that: the position that described backlash compensation actuator is installed is the fixed position that the wedge shape filler rod is adjusted in original gap, described backlash compensation actuator is little gradient wedge, the front end face of described backlash compensation actuator is plane, for the ram contact-making surface, the rear end face of described backlash compensation actuator is inclined-plane, and is corresponding with the little gradient wedge shape installed surface on saddle; On described backlash compensation actuator, Circular Thin pressure structure is set, the elastic springing thin-walled of described Circular Thin pressure structure is arranged on the front end face of backlash compensation actuator, on described end cap, have the sealing ring deep gouge, mounting O-shaped sealing ring in described sealing ring deep gouge, described end cap is fixed by screws in the counterbore of backlash compensation actuator rear end face, form the pressurization oil pocket, the thickness of described end cap does not exceed the rear end face of backlash compensation actuator; The laminating processing of described backlash compensation actuator front end face, be provided with oil cavity on laminating; In described backlash compensation actuator, be provided with pressurization oil circuit and lubricant passage way.
3. gantry machining center side as claimed in claim 1 ram microgap bucking-out system, it is characterized in that: the side of cylinder block of described control pressurer system is provided with oil-in, the oiling pipeline of auxiliary oiling device is repeatedly kicked on the oil-in of described cylinder body by check valve, the front end face of described cylinder body has oil-out, and the flowline of described cylinder body is connected with the pressurization oil pocket of eight backlash compensation actuators through the bleed off circuit piece; Described plunger bushing is contained in the cavity volume hole of described cylinder body and can seesaws, and on the outer ring surface of described plunger, have sealing ring deep gouge is installed, but described sealing ring is installed deep gouge mounting O-shaped sealing ring and is coordinated back-up ring or the lip-type packing of Y type is installed; Described guide rail structure comprises pull bar guide rail, nut connecting plate and lining, described nut connecting plate can drawn described pull bar guide rail by described lining and seesawed, described trapezoidal screw transmission mechanism comprises trapezoidal screw axle and feed screw nut, described trapezoidal screw axle rotatably is fixed on support by bearing, the trapezoidal screw section of described trapezoidal screw axle and described feed screw nut's engaged transmission, the rear end of described plunger and described feed screw nut are fixed on described nut connecting plate; Described drive motors is fixed on the base plate of support, and the output shaft of described drive motors is connected with described trapezoidal screw axle by shaft coupling.
4. as claim 1 or 2 or 3 described gantry machining center side ram microgap bucking-out systems, it is characterized in that: the support of described control pressurer system comprises base plate, front vertical plate, back vertical plate, described pull bar guide rails assembling, in the pull bar guide rail hole of described front vertical plate and back vertical plate, and is joined with bolts on support; The rear end face of described cylinder body can be equipped with cylinder end caps, in described cylinder end caps, is provided with the dust ring mounting groove, in described dust ring mounting groove, settles C type dust ring; In the rear end face of described plunger, also be provided with the unsettled hole of trapezoidal screw; The trapezoidal screw section of described trapezoidal screw axle and described feed screw nut's engaged transmission, in the unsettled hole of trapezoidal screw that the unsettled trapezoidal screw that stretches out of described feed screw nut's front end is carried on described plunger.
5. as claim 1 or 2 or 3 described gantry machining center side ram microgap bucking-out systems, it is characterized in that: described backlash compensation actuator is fixed on the little gradient wedge shape installed surface of sliding saddle of machine tool by contiguous block, on described contiguous block, be provided with backlash compensation actuator attachment screw hole, fixing screw hole, screwed hole is adjusted in gap, described backlash compensation actuator is fixed on the backlash compensation actuator installed surface of described contiguous block by backlash compensation actuator attachment screw hole, described contiguous block is fixed on saddle by fixing screw hole, make the rear end face of backlash compensation actuator overlap with the little gradient wedge shape installed surface on saddle, on described contiguous block, also be provided with pressurization oil duct oil-in, oil leab oil-in, on the backlash compensation actuator installed surface of described contiguous block, be provided with pressurization oil duct sealing ring deep gouge and oil leab sealing ring installation deep gouge are installed.
6. as claim 1 or 2 or 3 described gantry machining center side ram microgap bucking-out systems, it is characterized in that: on described backlash compensation actuator, be provided with pressurization oil duct and oil leab, described pressurization oil duct connects the pressurization oil pocket of M Circular Thin pressure structure on the backlash compensation actuator, described oil leab has copper pipe deep gouge is installed in the side of backlash compensation actuator, at described copper pipe, buried tube type in deep gouge is installed copper pipe is installed, described copper pipe realizes that oil leab is from nearly oil-in end to the linking away from the oil-in end, the oil-out of described oil leab is opened on the oil cavity of laminating of backlash compensation actuator.
7. as claim 1 or 2 or 3 described gantry machining center side ram microgap bucking-out systems, it is characterized in that: three Circular Thin pressure structures are set to described backlash compensation actuator equal intervals.
8. as claim 1 or 2 or 3 described gantry machining center side ram microgap bucking-out systems, it is characterized in that: described electric control module comprises pressure feedback control module and lathe Z axis feeding coordinate signal unit, described pressure feedback unit comprises pressure sensor, signal amplifier, data acquisition card, PLC control module, D/A converter and interface arrangement, and described PLC control module is a processing module of Electrical Control of Machinery Tools system; Described lathe Z axis feeding coordinate signal unit is encoder or the grating scale of lathe Z axis feed servo system, lathe Z axis feeding coordinate signal unit provides a Z axis coordinate signal accurately can for described PLC control module in real time, after the PLC control module compares according to the signal of Z axis coordinate signal and pressure sensor feedback, the result of processing is converted into to analog signal by D/A converter, for the operation of controlled pressure control system drive motors.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013203445116U CN203292950U (en) | 2013-06-14 | 2013-06-14 | Micro-gap compensation system for square ram of gantry machining center |
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| CN2013203445116U CN203292950U (en) | 2013-06-14 | 2013-06-14 | Micro-gap compensation system for square ram of gantry machining center |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105798705A (en) * | 2014-12-30 | 2016-07-27 | 武汉重型机床集团有限公司 | Machining compensation method for high-precision hole system of austenitic stainless steel plate part |
| CN103350371B (en) * | 2013-06-14 | 2016-09-28 | 薛莉英 | Ram microgap, gantry machining center side compensates system |
| CN110103080A (en) * | 2019-05-23 | 2019-08-09 | 沈阳航空制造有限公司 | Intelligent production line machine tooling conformance error compensation method |
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2013
- 2013-06-14 CN CN2013203445116U patent/CN203292950U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103350371B (en) * | 2013-06-14 | 2016-09-28 | 薛莉英 | Ram microgap, gantry machining center side compensates system |
| CN105798705A (en) * | 2014-12-30 | 2016-07-27 | 武汉重型机床集团有限公司 | Machining compensation method for high-precision hole system of austenitic stainless steel plate part |
| CN105798705B (en) * | 2014-12-30 | 2018-02-02 | 武汉重型机床集团有限公司 | The processing compensation method of austenitic stainless steel disk-like accessory high-precision porous |
| CN110103080A (en) * | 2019-05-23 | 2019-08-09 | 沈阳航空制造有限公司 | Intelligent production line machine tooling conformance error compensation method |
| CN110103080B (en) * | 2019-05-23 | 2021-05-14 | 沈阳航空制造有限公司 | Machine tool machining consistency error compensation method for intelligent production line |
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