CN114633212B - Hydrostatic bearing grinding head - Google Patents
Hydrostatic bearing grinding head Download PDFInfo
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- CN114633212B CN114633212B CN202210293802.0A CN202210293802A CN114633212B CN 114633212 B CN114633212 B CN 114633212B CN 202210293802 A CN202210293802 A CN 202210293802A CN 114633212 B CN114633212 B CN 114633212B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/04—Headstocks; Working-spindles; Features relating thereto
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/007—Weight compensation; Temperature compensation; Vibration damping
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B45/00—Means for securing grinding wheels on rotary arbors
- B24B45/003—Accessories therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B47/00—Drives or gearings; Equipment therefor
- B24B47/28—Equipment for preventing backlash
Abstract
The invention relates to the technical field of grinding head equipment, in particular to a hydrostatic bearing grinding head. Including the grinding seat of being connected with grinding machine lifting beam, the side of grinding the seat is provided with the revolving stage that is used for angle regulation, and the revolving stage is provided with the bistrique subassembly, and the bistrique subassembly includes: the grinding wheel clamping device comprises a bearing shell, a motor, a bearing part, a clamping part, an unloading device and a grinding wheel, wherein the bearing part is connected with the clamping part through the unloading device, the grinding wheel is fixed on the clamping part, the bearing part comprises a main shaft, the output end of the motor is connected with one end of the main shaft, and the other end of the main shaft is connected with the clamping part. According to the invention, the vibration damper is arranged in the rotating table, so that the vibration energy of the grinding head assembly during grinding operation is reduced, and the dynamic stability of the grinding head is improved; the fit clearance between the clearance eliminating worm and the worm wheel in the rotating table is extremely small, the self clearance eliminating process can be realized in the rotating process of the rotating table, and the vibration generated by the clearance during the meshing of the traditional worm and worm wheel is avoided.
Description
Technical Field
The invention relates to the technical field of grinding head equipment, in particular to a hydrostatic bearing grinding head.
Background
At present, the bearings adopted on the grinding head main shaft of the grinding machine comprise a pure hydrostatic bearing, a pure dynamic pressure bearing and a dynamic and static pressure bearing, the pure hydrostatic bearing needs a set of high-power oil supply system, the pure dynamic pressure bearing generates friction when starting and stopping, and the dynamic and static pressure bearing has the advantages of the dynamic pressure bearing and the static pressure bearing and has the advantages of large bearing capacity, high bearing rigidity, high rotating speed, low power consumption and the like, so the dynamic and static pressure bearing is most widely applied to the grinding head main shaft of the roll grinding machine.
The dynamic performance of the grinding head of the grinding machine is an important index for evaluating the resistance of the whole grinding machine to self-excited vibration and forced vibration, and the dynamic performance of the grinding head is closely related to the grinding precision and is a core component of the whole grinding machine. When the grinding head runs at a high speed, a periodic exciting force is accompanied, and when the frequency of the exciting force is the same as the natural frequency of the grinding head, the grinding head can resonate. The resonance may affect the grinding precision of the grinding head, so that the processing quality of the workpiece cannot reach the standard, the rejection rate is increased, and even the structure of the machine tool can be damaged in severe cases. The vibrations of the grinding head have adverse effects in most cases, which can seriously impair the machining quality, reduce the grinding efficiency, generate noise, and increase the wear of the grinding wheel. In order to reduce the vibrations of the grinding machine, it is necessary to improve its dynamic performance. When the balance of the mechanical system of the grinding machine is damaged, the vibration kept by the elasticity of the mechanical system is free vibration, and the vibration frequency is the natural frequency of the mechanical system; the second is forced vibration, which refers to vibration generated by a mechanical system under the action of continuous excitation of an external force. The capacity required for vibration comes from an excitation source generating excitation force, and the amplitude is not attenuated; the third is self-excited vibration, which mainly occurs in the grinding process of the grinding machine, and is a result of interaction between the grinding machine and the process, and is usually caused by dynamic instability of the grinding process, or instability of the motion of the grinding head on the guide rail, or dynamic instability of the servo system. It should be noted that the vibration of the grinding head of the grinding machine cannot be avoided.
In view of the above, a grinding wheel head with high dynamic stability is needed.
Disclosure of Invention
The invention aims to provide a hydrostatic bearing grinding head which is used for improving the dynamic stability of the grinding head during grinding operation.
The invention is realized by the following technical scheme:
the utility model provides a hydrostatic bearing bistrique, includes the mill seat of being connected with grinding machine lifting beam, the side of mill seat is provided with the revolving stage that is used for angle regulation, the revolving stage is last to be provided with the bistrique subassembly, the bistrique subassembly includes: the grinding machine comprises a bearing shell, a motor, a bearing part, a clamping part, an unloading device and a grinding wheel, wherein the bearing part is connected with the clamping part through the unloading device, the grinding wheel is fixed on the clamping part, the bearing part comprises a main shaft, the output end of the motor is connected with one end of the main shaft, and the other end of the main shaft is connected with the clamping part; the bearing component further includes: bearing housing, thrust ring, bearing housing, sealing washer and angular contact bearing, the bearing housing cover is established the periphery of main shaft, the outer wall of bearing housing with bearing housing's inner wall connection, the thrust ring sets up the periphery of bearing housing and with the bearing housing butt, the side of thrust ring is provided with briquetting lock nut, the sealing washer sets up the main shaft is close to the one end of emery wheel, angular contact bearing sets up the main shaft is kept away from the one end of emery wheel, oil feed channel has been seted up on the bearing housing, the helicla flute has been seted up to the outer peripheral face of main shaft, angular contact bearing's side still is provided with sealed lid. It should be noted that, when the grinding head runs at a high speed, the grinding head is accompanied by a periodic exciting force, and when the frequency of the exciting force is the same as the natural frequency of the grinding head, the grinding head will resonate. The resonance may affect the grinding precision of the grinding head, so that the processing quality of the workpiece cannot reach the standard, the rejection rate is increased, and the structure of the machine tool can be even damaged in severe cases. The vibrations of the grinding head have adverse effects in most cases, which can seriously impair the machining quality, reduce the grinding efficiency, generate noise, and increase the wear of the grinding wheel. It should be further noted that, in view of the above problems, the applicant finds out during long-term work, practical tests and after combining related documents that the dynamic performance of the grinding head is limited by the related physical properties of the oil film and the fit clearance of the rotating table structure. Wherein, the related technology of the related physical properties of the oil film has been greatly developed, and no substantial result can be obtained in a short time; for the structure of the rotating table of the grinding head, the angle adjusting function of the rotating table is generally used by matching a worm wheel and a worm, wherein the worm wheel and the worm have a larger contact gap, and the dynamic performance of the grinding head is reduced by further adopting the gap through the high-speed grinding operation of the grinding head. In summary, the applicant uses the fixed worm and the movable worm in a matching way, specifically, the movable worm generates axial micro-motion relative to the fixed worm, the tooth surfaces can be kept in fit, the return difference formed by backlash in motion is eliminated, and the precision of the rotating table is realized.
Further, the clamping member includes: chuck spare, top cover, end cover, fixing bolt, chuck spare includes complex chuck left part and chuck right part, the chuck left part with the chuck right part passes through fixing bolt connects the centre gripping the emery wheel, the side of chuck right part seted up with unloading device complex interior concave cavity, the end cover sets up the end of main shaft and with the chuck left part can be dismantled and be connected, is located the main shaft of chuck right part inner circle has the tapering, the outside of end cover is provided with the clamping bolt that is used for adjusting magnitude of interference, the top cover sets up clamping bolt's inside. The unloading device is used for unloading part of pre-tightening force generated by the clamping part onto a bearing shell, so that load on the main shaft is reduced, part of deformation on the shaft is reduced, the improvement of the rotation precision of the main shaft is facilitated, the improvement of the dynamic performance of the main shaft is assisted, the clamping part mainly comprises a chuck part and a fixing bolt, the left part of the chuck and the right part of the chuck clamp a grinding wheel through connection of the fixing bolt, the right part of the chuck and a matched main shaft section have conicity and belong to interference fit, the interference magnitude is adjusted by pushing a top sleeve through the clamping bolt, and furthermore, the structural design can enable the grinding wheel to be more convenient to assemble and disassemble.
Further, the rotating table includes: the anti-backlash mechanism comprises a rotating shell, an anti-backlash worm, a worm wheel, a rotating table board and a rotating hand wheel, wherein the worm wheel is rotatably arranged inside the rotating shell and connected with the rotating table board, the anti-backlash worm is arranged inside the rotating shell and matched with the worm wheel, and the end part of the anti-backlash worm penetrates through the rotating shell and connected with the rotating hand wheel. The anti-backlash worm comprises: fixed worm, activity worm, spring, adjustment pad and adjusting bolt, the inside cavity of activity worm, the internal thread has been seted up to the one end of fixed worm, the other end with rotatory hand wheel connection, fixed worm with the activity worm passes through adjusting bolt axial connection, the adjustment pad sets up fixed worm with between the activity worm, the spring housing is established adjusting bolt's periphery, fixed worm with the relative position of activity worm is fixed and can rotate under the operating condition in step. It should be noted that, the rotating table on the grinding machine is one of the effective load components of the grinding head, and not only plays a role of angle adjustment, but also needs to consider the positioning output under the condition of accurate position, so as to ensure that the bidirectional rotation of the rotating table does not generate positioning errors. In the prior art, part of the rotating table is driven by the stepping motor, the output torque is large, the mass of the rotating table is also large, the overall mass of the grinding head is increased, and the dynamic stability of the grinding head is reduced. In view of this, the applicant ensures tooth surface fitting through an adjusting pad in the middle of the sectional type backlash eliminating worm and realizes the movement without return difference.
Further, the inside center of revolving stage is provided with vibration damper, vibration damper is including setting gradually from top to bottom: supporting seat, bracing piece, damping shell and damping seat, the supporting seat with bracing piece threaded connection, the inside of damping shell is provided with cushion, first damping spring, second damping spring and damping piece, the cushion sets up the up end of damping seat, the both ends of first damping spring with the up end of cushion, the lower terminal surface of damping piece are connected, the lower extreme of bracing piece runs through the damping shell with the damping piece is connected, the both ends of second damping spring with the up end of damping piece, the upper end of damping shell inner wall are connected. Damping is the various frictional and other damping effects that damp free vibration, and dampers act to provide resistance to movement and to dissipate energy from movement.
Preferably, the worm wheel is made of polyimide, and the fixed worm and the movable worm are made of titanium alloy. The weight reduction and self-lubrication of the turntable can be realized by adjusting the material of the worm gear.
Preferably, a shafting driving motor and a shafting angle sensor for assisting rotation are further arranged in the rotating table. The shafting driving motor is arranged at the end part of the movable worm, the shafting angle sensor is arranged at the end part of the fixed worm to form a driving control shafting and arranged in the rotating shell, the anti-backlash worm and the worm gear are meshed to form a space conjugate kinematic pair to form a transmission form of 'driving of the azimuth shafting driving motor', meanwhile, the shafting angle sensor forms a measurement feedback unit and forms a closed-loop control system together with the shafting driving motor, and the accurate positioning of the rotating platform and the auxiliary improvement of the dynamic stability performance are realized from two aspects of a mechanical structure and a control system.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. according to the invention, the vibration damper is arranged in the rotating table, so that the vibration energy of the grinding head assembly during grinding operation is reduced, and the dynamic stability of the grinding head is improved;
2. the fit clearance between the clearance eliminating worm and the worm wheel in the rotating table is extremely small, and the clearance self-eliminating process can be realized in the rotating process of the rotating table, so that the vibration generated by the clearance during the meshing of the traditional worm and worm wheel is avoided, and the dynamic stability of the grinding head is improved in an auxiliary manner;
3. the chuck piece and the grinding wheel are matched for use, so that the grinding wheel can be assembled and disassembled more conveniently.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic view of the structure of the present invention;
fig. 2 is a cross-sectional view of the grater assembly;
FIG. 3 is a cross-sectional view of the clamping assembly;
FIG. 4 is a schematic view of the rotary table;
FIG. 5 is a schematic view of the internal structure of the turntable;
FIG. 6 is a cross-sectional view of an anti-backlash worm;
fig. 7 is a sectional view of the vibration damper.
Reference numbers and corresponding part names in the drawings:
1-grinding seat, 2-rotating table, 21-rotating hand wheel, 22-rotating housing, 23-rotating table top, 24-vibration damper, 241-supporting seat, 242-supporting rod, 243-second damping spring, 244-damping housing, 245-damping member, 246-first damping spring, 247-cushion block, 248-damping seat, 25-backlash worm, 251-fixed worm, 252-movable worm, 253-spring, 254-adjusting pad, 255-adjusting bolt, 26-worm wheel, 3-grinding head assembly, 31-motor, 32-grinding head assembly, 320-sealing ring, 321-bearing housing, 322-thrust ring, 323-press block locking nut, 324-bearing housing, 325-angular contact bearing, 326-main shaft, 327-spiral groove, 328-oil inlet channel, 329-unloading device, 33-grinding wheel, 34-chuck clamping member, 341-chuck member, 3411-right part, 3412-left part, 342-inner concave cavity, 343-washer, 344-coupling bolt, 344-clamping bolt, 345-top cover, 347-end cover.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
The embodiment is as follows:
the utility model provides a hydrostatic bearing bistrique, includes the mill seat 1 of being connected with grinding machine lifting beam, the side of mill seat 1 is provided with the rotation platform 2 that is used for angle regulation, be provided with bistrique subassembly 3 on the rotation platform 2, bistrique subassembly 3 includes: the grinding machine comprises a bearing shell 321, a motor 31, a bearing component, a clamping component 34, an unloading device 329 and a grinding wheel 33, wherein the bearing component is connected with the clamping component 34 through the unloading device 329, the grinding wheel 33 is fixed on the clamping component 34, the bearing component comprises a main shaft 326, the output end of the motor 31 is connected with one end of the main shaft 326, and the other end of the main shaft 326 is connected with the clamping component 34; the bearing component further includes: the bearing sleeve 324 is sleeved on the periphery of the main shaft 326, the outer wall of the bearing sleeve 324 is connected with the inner wall of the bearing shell 321, the thrust ring 322 is arranged on the periphery of the bearing sleeve 324 and is abutted to the bearing shell 321, a pressing block locking nut 323 is arranged on the side face of the thrust ring 322, the sealing ring 320 is arranged at one end, close to the grinding wheel 33, of the main shaft 326, the angular contact bearing 325 is arranged at one end, far away from the grinding wheel 33, of the main shaft 326, an oil inlet channel 328 is arranged on the bearing sleeve 324, a spiral groove 327 is arranged on the outer peripheral face of the main shaft 326, and a sealing cover is further arranged on the side face of the angular contact bearing 325.
The clip member 34 includes: the grinding wheel grinding machine comprises a chuck member 341, a top sleeve 347, an end cover 346 and a fixing bolt, wherein the chuck member 341 comprises a chuck left part 3412 and a chuck right part 3411 which are matched, the chuck left part 3412 and the chuck right part 3411 are connected through the fixing bolt to clamp the grinding wheel 33, an inner concave cavity 342 matched with the unloading device 329 is formed in the side surface of the chuck right part 3411, the end cover 346 is arranged at the tail end of the main shaft 326 and is detachably connected with the chuck left part 3412, the main shaft 326 positioned at the inner ring of the chuck right part 3411 is provided with a taper, a clamping bolt 345 used for adjusting the interference is arranged on the outer portion of the end cover 346, and the top sleeve 347 is arranged inside the clamping bolt 345. The rotating table 2 includes: rotate shell 22, anti-backlash worm 25, worm wheel 26, rotate mesa 23 and rotatory hand wheel 21, worm wheel 26 rotates to be set up rotate shell 22 inside and with it connects to rotate mesa 23, anti-backlash worm 25 sets up rotate shell 22 inside and with worm wheel 26 cooperation, the tip of anti-backlash worm 25 run through rotate shell 22 and with rotatory hand wheel 21 is connected. The anti-backlash worm 25 includes: the adjustable worm gear comprises a fixed worm 251, a movable worm 252, a spring 253, an adjusting pad 254 and an adjusting bolt 255, wherein the movable worm 252 is hollow, one end of the fixed worm 251 is provided with an internal thread, the other end of the fixed worm 251 is connected with the rotating hand wheel 21, the fixed worm 251 is axially connected with the movable worm 252 through the adjusting bolt 255, the adjusting pad 254 is arranged between the fixed worm 251 and the movable worm 252, the spring 253 is sleeved on the periphery of the adjusting bolt 255, and the fixed worm 251 and the movable worm 252 are fixed in relative positions and can synchronously rotate in a working state. The inside center of revolving stage 2 is provided with vibration damper 24, vibration damper 24 is including setting gradually from top to bottom: supporting seat 241, bracing piece 242, damping shell 244 and damping seat 248, supporting seat 241 with bracing piece 242 threaded connection, the inside of damping shell 244 is provided with cushion block 247, first damping spring 246, second damping spring 243 and damping piece 245, cushion block 247 sets up the up end of damping seat 248, the both ends of first damping spring 246 with the up end of cushion block 247, the lower terminal surface of damping piece 245 are connected, the lower extreme of bracing piece 242 runs through damping shell 244 with the damping piece 245 is connected, the both ends of second damping spring 243 with the up end of damping piece 245, the upper end of damping shell 244 inner wall are connected. The worm wheel 26 is made of polyimide, and the fixed worm 251 and the movable worm 252 are made of titanium alloy. A shafting driving motor and a shafting angle sensor for assisting rotation are further arranged in the rotating table 2.
It should be noted that when the grinding head is operated at a high speed, the grinding head is accompanied by a periodic exciting force, and when the frequency of the exciting force is the same as the natural frequency of the grinding head, the grinding head resonates. The resonance may affect the grinding precision of the grinding head, so that the processing quality of the workpiece cannot reach the standard, the rejection rate is increased, and even the structure of the machine tool can be damaged in severe cases. The vibrations of the grinding head have adverse effects in most cases, which seriously impair the machining quality, reduce the grinding efficiency, generate noise, and increase the wear of the grinding wheel 33. It should be further noted that, in view of the above problems, the applicant found out that the dynamic performance of the grinding head is limited by the relevant physical properties of the oil film and the fit clearance of the structure of the rotating table 2 during long-term work, practical tests and after the relevant documents. Wherein, the related technology of the related physical property of the oil film has been greatly developed, and no substantial result can be obtained in a short time; for the structure of the rotating table 2 of the grinding head, the angle adjusting function of the rotating table 2 is generally used by matching a worm wheel 26 with a worm, wherein the worm wheel 26 and the worm have a larger contact gap, and the dynamic performance of the grinding head is reduced by further adopting the gap through the high-speed grinding operation of the grinding head. In summary, the applicant uses the fixed worm 251 and the movable worm 252 in cooperation, and specifically, the movable worm 252 generates an axial micro-motion relative to the fixed worm 251, so as to keep the tooth surfaces in contact with each other, eliminate a backlash caused by backlash in the motion, and realize the precision of the rotating table 2.
It should be further noted that the clamping member 34 includes: the grinding wheel grinding machine comprises a chuck member 341, a top sleeve 347, an end cover 346 and a fixing bolt, wherein the chuck member 341 comprises a chuck left part 3412 and a chuck right part 3411 which are matched, the chuck left part 3412 and the chuck right part 3411 are connected through the fixing bolt to clamp the grinding wheel 33, an inner concave cavity 342 matched with the unloading device 329 is formed in the side surface of the chuck right part 3411, the end cover 346 is arranged at the tail end of the main shaft 326 and is detachably connected with the chuck left part 3412, the main shaft 326 positioned in the inner ring of the chuck right part 3411 is provided with a taper, the outer part of the end cover 346 is provided with the clamping bolt 345 for adjusting interference, and the top sleeve 347 is arranged inside the clamping bolt 345. The unloading device 329 is used for unloading part of pretightening force generated by the clamping part 34 to the bearing shell 321, so that load on the main shaft 326 is reduced, part of deformation on the shaft is reduced, the rotation precision of the main shaft 326 is improved, and the dynamic performance of the main shaft 326 is improved in an auxiliary manner, the clamping part 34 mainly comprises a chuck part 341 and a fixing bolt, the left chuck part 3412 and the right chuck part 3411 are connected through the fixing bolt to clamp the grinding wheel 33, the right chuck part 3411 and a matched main shaft 326 section have conicity and are in interference fit, interference magnitude is adjusted by pushing the top sleeve 347 through the clamping bolt 345, and furthermore, the structural design can enable the grinding wheel 33 to be more convenient to assemble and disassemble.
It should be noted that, the applicant also conducted research on the matching and independent use conditions of the rotating table 2 and the clamping component 34, wherein according to experimental data, the improvement of the independent rotating table 2 and the clamping component 34 has a certain improvement on the vibration amount of the grinding head, but the performance improvement is not significant, and under the matching use condition, the overall dynamic performance of the grinding head can be greatly improved. In this regard, the applicant has also found, in combination with the effect of the actual grinding operation, that grinding chatter marks during grinding are greatly reduced.
It should be further noted that the rotating table 2 includes: rotate shell 22, anti-backlash worm 25, worm wheel 26, table face 23 and rotatory hand wheel 21 rotate the setting and are in rotate the shell 22 inside and with table face 23 connects rotates, anti-backlash worm 25 sets up rotate the shell 22 inside and with the worm wheel 26 cooperation, the tip of anti-backlash worm 25 runs through rotate the shell 22 and with rotatory hand wheel 21 is connected. The anti-backlash worm 25 includes: the adjustable worm gear comprises a fixed worm 251, a movable worm 252, a spring 253, an adjusting pad 254 and an adjusting bolt 255, wherein the movable worm 252 is hollow, one end of the fixed worm 251 is provided with an internal thread, the other end of the fixed worm 251 is connected with the rotating hand wheel 21, the fixed worm 251 is axially connected with the movable worm 252 through the adjusting bolt 255, the adjusting pad 254 is arranged between the fixed worm 251 and the movable worm 252, the spring 253 is sleeved on the periphery of the adjusting bolt 255, and the fixed worm 251 and the movable worm 252 are fixed in relative positions and can synchronously rotate in a working state. It should be noted that, the rotating table 2 on the grinding machine is one of the payload components of the grinding head, and not only plays a role of angle adjustment, but also needs to consider the positioning output under the condition of accurate position, so as to ensure that no positioning error is generated when the rotating table 2 rotates bidirectionally. In the prior art, part of the rotating table 2 is driven by the stepping motor 31, the output torque is large, the mass of the rotating table 2 is large, the overall mass of the grinding head is increased, and the dynamic stability of the grinding head is reduced. In view of this, the applicant ensures tooth surface fit through the adjusting pad 254 in the middle of the segmented anti-backlash worm 25, and realizes no return difference motion.
In this embodiment, it is preferable that the inside center of the turntable 2 is provided with a vibration damper 24, the vibration damper 24 includes from top to bottom: supporting seat 241, bracing piece 242, damping shell 244 and damping seat 248, supporting seat 241 with bracing piece 242 threaded connection, the inside of damping shell 244 is provided with cushion block 247, first damping spring 246, second damping spring 243 and damping piece 245, cushion block 247 sets up the up end of damping seat 248, the both ends of first damping spring 246 with the up end of cushion block 247, the lower terminal surface of damping piece 245 are connected, the lower extreme of bracing piece 242 runs through damping shell 244 with the damping piece 245 is connected, the both ends of second damping spring 243 with the up end of damping piece 245, the upper end of damping shell 244 inner wall are connected. Damping is the effect of various friction and other obstacles that dampen free vibration, and dampers function to provide resistance to motion and to dissipate motion energy. Preferably, the material of the worm wheel 26 is polyimide, and the material of the fixed worm 251 and the movable worm 252 is titanium alloy. The material of the worm wheel 26 and the worm is adjusted to reduce the weight of the turntable 2 and to achieve self-lubrication. Preferably, a shafting driving motor and a shafting angle sensor for assisting rotation are further arranged in the rotating table 2. The shafting driving motor is arranged at the end part of the movable worm 252, the shafting angle sensor is arranged at the end part of the fixed worm 251 to form a driving control shafting and arranged in the rotating shell 22, the anti-backlash worm 25 and the worm wheel 26 are meshed to form a space conjugate kinematic pair to form a transmission form of 'azimuth shafting driving motor driving', meanwhile, the shafting angle sensor forms a measurement feedback unit and forms a closed-loop control system together with the shafting driving motor, and the accurate positioning of the rotating table 2 and the auxiliary improvement of the dynamic stability performance are realized from the two aspects of a mechanical structure and a control system.
Taking the test of an internal grinding machine as an example, the internal grinding machine is liable to generate grinding vibration under some excitation, which affects the grinding precision, and therefore, the vibration displacement is required to be small during grinding operation, that is, the dynamic stability is required to be high. Through finite element model calculation and experimental analysis of the whole machine, the first-order modal frequency of the whole machine is set to be 117.9 Hz, the second-order modal frequency is set to be 168.3 Hz, and the vibration displacement data of the first-order modal frequency of the whole machine is shown in the following table:
the vibration displacement data of the second-order modal frequency of the whole machine is shown in the following table:
according to the data in the table, the amplitude of the grinding contact part of the grinding head and the workpiece can be effectively reduced, and the influence of forced vibration and self-excited vibration of the grinding head on the machining precision of the grinding head in a working state can be effectively reduced, so that the dynamic stability of the grinding head is effectively improved.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (5)
1. The utility model provides a hydrostatic bearing bistrique, includes grinding seat (1) of being connected with grinding machine lifting beam, its characterized in that: the side of grinding seat (1) is provided with rotation platform (2) that are used for angle regulation, be provided with bistrique subassembly (3) on rotation platform (2), bistrique subassembly (3) include: the grinding wheel grinding device comprises a bearing shell (321), a motor (31), a bearing part, a clamping part (34), an unloading device (329) and a grinding wheel (33), wherein the bearing part is connected with the clamping part (34) through the unloading device (329), the grinding wheel (33) is fixed on the clamping part (34), the bearing part comprises a main shaft (326), the output end of the motor (31) is connected with one end of the main shaft (326), and the other end of the main shaft (326) is connected with the clamping part (34);
the bearing component further includes: the grinding wheel bearing comprises a bearing shell (321), a thrust ring (322), a bearing sleeve (324), a sealing ring (320) and an angular contact bearing (325), wherein the bearing sleeve (324) is sleeved on the periphery of a main shaft (326), the outer wall of the bearing sleeve (324) is connected with the inner wall of the bearing shell (321), the thrust ring (322) is arranged on the periphery of the bearing sleeve (324) and is abutted against the bearing shell (321), a pressing block locking nut (323) is arranged on the side face of the thrust ring (322), the sealing ring (320) is arranged at one end, close to a grinding wheel (33), of the main shaft (326), the angular contact bearing (325) is arranged at one end, far away from the grinding wheel (33), of the main shaft (326), an oil inlet channel (328) is formed in the bearing sleeve (324), a spiral groove (327) is formed in the outer peripheral face of the main shaft (326), and a sealing cover is further arranged on the side face of the angular contact bearing (325);
the rotating table (2) comprises: the anti-backlash mechanism comprises a rotating shell (22), an anti-backlash worm (25), a worm wheel (26), a rotating table top (23) and a rotating hand wheel (21), wherein the worm wheel (26) is rotatably arranged in the rotating shell (22) and connected with the rotating table top (23), the anti-backlash worm (25) is arranged in the rotating shell (22) and matched with the worm wheel (26), and the end part of the anti-backlash worm (25) penetrates through the rotating shell (22) and is connected with the rotating hand wheel (21);
the anti-backlash worm (25) comprises: the adjustable worm gear comprises a fixed worm (251), a movable worm (252), a spring (253), an adjusting pad (254) and an adjusting bolt (255), wherein the movable worm (252) is hollow, an internal thread is formed in one end of the fixed worm (251), the other end of the fixed worm (251) is connected with the rotating hand wheel (21), the fixed worm (251) is axially connected with the movable worm (252) through the adjusting bolt (255), the adjusting pad (254) is arranged between the fixed worm (251) and the movable worm (252), the spring (253) is sleeved on the periphery of the adjusting bolt (255), and the fixed worm (251) and the movable worm (252) are fixed in relative positions and can synchronously rotate in a working state.
2. A hydrostatic bearing grinding head according to claim 1, wherein: the clamp member (34) includes: the grinding wheel (33) comprises a chuck piece (341), a top sleeve (347), an end cover (346) and a fixing bolt, wherein the chuck piece (341) comprises a chuck left part (3412) and a chuck right part (3411) which are matched, the chuck left part (3412) and the chuck right part (3411) are connected through the fixing bolt to clamp the grinding wheel (33), the side surface of the chuck right part (3411) is provided with an inner concave cavity (342) matched with the unloading device (329), the end cover (346) is arranged at the tail end of the main shaft (326) and is detachably connected with the chuck left part (3412), the main shaft (326) positioned at the inner ring of the chuck right part (3411) is provided with a taper, the outer part of the end cover (346) is provided with a clamping bolt (345) used for adjusting the interference, and the top sleeve (347) is arranged inside the clamping bolt (345).
3. A hydrostatic bearing grinding head according to claim 1, wherein: the inside center of revolving stage (2) is provided with vibration damper (24), vibration damper (24) are including setting gradually from top to bottom: supporting seat (241), bracing piece (242), damping shell (244) and damping seat (248), supporting seat (241) with bracing piece (242) threaded connection, the inside of damping shell (244) is provided with cushion (247), first damping spring (246), second damping spring (243) and damping piece (245), cushion (247) set up the up end of damping seat (248), the both ends of first damping spring (246) with the up end of cushion (247), the lower terminal surface of damping piece (245) are connected, the lower extreme of bracing piece (242) runs through damping shell (244) with damping piece (245) are connected, the both ends of second damping spring (243) with the up end of damping piece (245), the upper end of damping shell (244) inner wall are connected.
4. A hydrostatic bearing grinding head according to claim 1, wherein: the worm wheel (26) is made of polyimide, and the fixed worm (251) and the movable worm (252) are made of titanium alloy.
5. A hydrostatic bearing grinding head according to claim 1, wherein: and a shafting driving motor and a shafting angle sensor for assisting rotation are further arranged in the rotating table (2).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210293802.0A CN114633212B (en) | 2022-03-23 | 2022-03-23 | Hydrostatic bearing grinding head |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210293802.0A CN114633212B (en) | 2022-03-23 | 2022-03-23 | Hydrostatic bearing grinding head |
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| CN114633212A CN114633212A (en) | 2022-06-17 |
| CN114633212B true CN114633212B (en) | 2023-03-03 |
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| CN211193404U (en) * | 2019-12-02 | 2020-08-07 | 众金泰(昆山)电子科技有限公司 | Polishing wheel angle inclination adjusting mechanism |
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| CN101234477A (en) * | 2008-03-05 | 2008-08-06 | 重庆三磨海达磨床有限公司 | Multifunctional grinding apparatus for large-scale container and grinding method |
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|---|---|
| CN114633212A (en) | 2022-06-17 |
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