Ultrasonic vibration atomization mechanism and grinding system of screw nut

Abstract

The application discloses an ultrasonic vibration atomization mechanism and a grinding system of a screw rod and a nut, wherein the ultrasonic vibration atomization mechanism comprises a body part and an atomization part; the body part comprises a containing shell, an ultrasonic power supply, a transducer and a vibration module; the ultrasonic power supply is used for providing an electric signal; the vibration module comprises the transducer at the first end of the vibration module; the transducer is connected with the ultrasonic power supply and is used for converting the electric signal into mechanical vibration; the end of the vibration module is connected with a vibrated part; and part of the vibration module is connected with the containing shell; the atomization part comprises an atomization nozzle, a liquid conveying rod, a liquid conveying pump and a liquid storage tank; and the atomization nozzle is connected with the end of the vibration module. The application meets the technical requirements and use requirements of high precision and high surface quality of hole workpiece internal thread tooth type, and the atomized grinding fluid is easier to enter between the abrasive and the workpiece, thereby improving the cooling and lubricating effect of the grinding fluid.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of grinding technology, in particular to an ultrasonic vibration atomization mechanism and a grinding system of a screw nut. BACKGROUND

[0002] The special geometry of the planetary roller screw nut inner thread form is generally 1.095mm in tooth width, 90 degrees in tooth form angle, [+11", -11"] in tolerance, 19.531 in tooth root diameter, [+0.02, 0] in tolerance, 20 in thread pitch diameter, [+0.001, 0] in tolerance, 0.624 in thread pitch diameter thickness, [0, -0.001] in tolerance, and 0.1 in tooth surface roughness Ra, with a machining precision requirement of 1 microns. The material is GCr15 with high hardness and a hardness of 60-62HRC. In addition, due to the limitation of the planetary roller screw nut inner hole tooth root diameter, the grinding wheel shaft diameter is 8mm and the length is 170mm, with a length-diameter ratio of more than 20, which is a typical weak stiffness mechanism. When grinding the inner thread of the planetary roller screw nut, it is easy to produce chatter, resulting in low machining precision and smoothness of the planetary roller screw nut inner thread form, high scrap rate, and deterioration of the surface micro quality, which cannot meet the high-precision and high-surface quality machining technical requirements and use requirements of the planetary roller screw nut inner thread form, and has become an industry bottleneck problem faced by high-performance part machining.

[0003] Ultrasonic grinding is a process method of grinding by using ultrasonic vibration of a grinding wheel (or a workpiece) in the grinding process. When the ultrasonic generator power is started, the ultrasonic generator sends an electrical signal to the ultrasonic transducer (piezoelectric type), and the ultrasonic transducer converts the electrical signal into a longitudinal mechanical vibration of the same frequency, which is transmitted to the amplitude lever and amplified to a predetermined value, and the resonant tool bar is pushed to vibrate and cut. The ultrasonic transducer, amplitude lever and tool bar are in a resonant state with the ultrasonic frequency output by the generator, forming a resonant system, and the fixed points should be on the displacement node. In general, in order to reduce the grinding temperature in the grinding area and lubricate the abrasive particles on the grinding wheel, a large amount of grinding fluid is used. Although a large amount of grinding fluid is used, it can only reduce the grinding temperature to a limited extent and can only provide boundary lubrication to the abrasive particles. At the same time, a large amount of grinding fluid is wasted and the cost of waste liquid treatment is generated. How to meet the high-precision and high-surface quality machining technical requirements and use requirements of the hole type workpiece inner thread form, and effectively reduce the grinding temperature, fully lubricate the abrasive particles-hole type workpiece grinding area, and reduce the grinding fluid and energy saving and emission reduction, is a technical problem to be solved in the field. SUMMARY

[0004] To this end, the technical problem to be solved by the present application is to provide an ultrasonic vibration atomization mechanism which can drive the grinding wheel or the workpiece to vibrate, meet the high-precision and high-surface-quality processing technical requirements and use requirements of the thread form in the hole workpiece, and atomize the grinding fluid, reduce the use amount of the grinding fluid, and improve the cooling and lubricating effect of the grinding fluid.

[0005] To solve the above technical problems, the present application provides an ultrasonic vibration atomization mechanism comprising a body part and an atomization part.

[0006] The body part comprises a containing shell, an ultrasonic power supply, a transducer, and a vibration module, the containing shell is provided with a containing cavity, the containing cavity has a first end facing the negative direction of the X-axis and a last end facing the positive direction of the X-axis, the last end of the containing cavity is open, the ultrasonic power supply is used to provide an electrical signal, the transducer is arranged in the containing cavity, and the transducer is connected to the ultrasonic power supply and used to convert the electrical signal into mechanical vibration; the vibration module has a first end facing the negative direction of the X-axis and a last end facing the positive direction of the X-axis, the first end of the vibration module is connected to the transducer, the last end of the vibration module is connected to a vibrating component, and the vibration module is connected to the containing shell.

[0007] The atomization part comprises an atomization nozzle, a liquid delivery rod, a liquid delivery pump, and a liquid storage tank, the atomization nozzle is used to spray the misty grinding fluid, the atomization nozzle is connected to the last end of the vibration module, the liquid delivery rod is coaxially fixed in the interior of the vibration module, and one end of the liquid delivery rod is communicated with the atomization nozzle; the liquid delivery pump is used to deliver the grinding fluid, the outlet of the liquid delivery pump is connected to the other end of the liquid delivery rod through a liquid delivery pipeline; and the liquid storage tank is used to store the grinding fluid, and the liquid storage tank is connected to the inlet of the liquid delivery pump through a liquid delivery pipeline.

[0008] Further, the liquid delivery rod is an externally threaded rod provided with a hollow channel, and the liquid delivery rod is threadedly connected to the interior of the vibration module.

[0009] Further, the atomization part further comprises a suction nozzle component and a cooling negative pressure device, the suction nozzle component is arranged on the port side of the hole workpiece away from the vibration module, the suction nozzle component is used to suck out the misty grinding fluid in the hole workpiece, and the cooling negative pressure device is connected to the suction nozzle component and the liquid storage tank, and the cooling negative pressure device is used to provide negative pressure for the suction nozzle component and to cool and liquefy the sucked-out misty grinding fluid and then send it back to the liquid storage tank.

[0010] Further, the liquid storage tank comprises an oil return area and a clean oil area, the oil return area is communicated with the cooling negative pressure device, the clean oil area is connected to the liquid delivery pump, and a filter and a magnetic filter membrane are arranged between the oil return area and the clean oil area.

[0011] Further, the vibration module comprises a first amplitude rod, a second amplitude rod and a mode conversion rod, the first amplitude rod and the second amplitude rod are used for transmitting and amplifying vibration amplitude, the mode conversion rod is used for decomposing longitudinal vibration into longitudinal vibration torsional vibration, adjusting vibration parameters and amplifying vibration amplitude, the first amplitude rod is connected with the transducer, the second amplitude rod is connected with the first amplitude rod, one end of the mode conversion rod is connected with the second amplitude rod, and the other end is connected with the vibrating component.

[0012] Further, the first amplitude rod is integrally formed with a first supporting part, the second amplitude rod is integrally formed with a second supporting part, and the first supporting part and the second supporting part are connected to the accommodating shell.

[0013] Further, the body part further comprises a first rotating support, and the accommodating shell is rotatably connected to the inner side of the first rotating support in the X-axis direction.

[0014] Further, the inner side of the first rotating support is provided with a stator, the outer side of the accommodating shell is provided with a rotor, the stator interacts with the rotor to drive the accommodating shell to rotate, the first rotating support, the accommodating shell, the stator and the rotor constitute an electric spindle, and the end of the vibration module is connected with a grinding wheel rod.

[0015] The application further provides a grinding system of a screw nut, comprising:

[0016] The ultrasonic vibration atomization mechanism, the first rotating support and the accommodating shell are unlocked and locked through a locking part, and the end of the vibration module is threadedly connected with a screw nut;

[0017] A workpiece mechanism, the workpiece mechanism comprises a second rotating support, a clamping part and a rotary driving device, the clamping part is rotatably connected to the inner side of the second rotating support in the X-axis direction, is used for fixing the screw nut and keeping the axial direction of the screw nut as the X-axis direction, and the rotary driving device is used for driving the clamping part to rotate in the X-axis direction.

[0018] A pushing mechanism, the pushing mechanism is used for driving the ultrasonic vibration atomization mechanism to translate along the X-axis direction.

[0019] A first rotary table, the first rotary table is used for driving the workpiece mechanism to rotate in the Y-axis direction.

[0020] A longitudinal translation mechanism, the longitudinal translation mechanism is used for driving the ultrasonic vibration atomization mechanism and the workpiece mechanism to translate along the X-axis direction.

[0021] An internal grinding mechanism, the internal grinding mechanism is connected with an internal grinding grinding wheel and drives the internal grinding grinding wheel to rotate in the X-axis direction.

[0022] An inner thread grinding mechanism is connected to the inner thread grinding wheel and drives the inner thread grinding wheel to rotate around the X-axis direction;

[0023] A second rotary table is used to drive the inner thread grinding mechanism to rotate around the Z-axis direction;

[0024] A lifting mechanism is used to drive the inner thread grinding mechanism to lift along the Y-axis direction;

[0025] A transverse translation mechanism is used to drive the inner cylindrical grinding mechanism and the inner thread grinding mechanism to translate along the Z-axis direction;

[0026] The ultrasonic vibration atomization mechanism is arranged on one side of the workpiece mechanism in the X-axis direction; the inner cylindrical grinding mechanism and the inner thread grinding mechanism are arranged at intervals along the Z-axis direction and are both arranged on the other side of the workpiece mechanism in the X-axis direction.

[0027] The application further provides another grinding system of a screw nut, comprising:

[0028] A workpiece mechanism comprises a second rotary support, a clamping component and a rotary driving device, the clamping component is rotatably connected to the inner side of the second rotary support in the X-axis direction, is used to fix the screw nut and keep the axial direction of the screw nut as the X-axis direction, and the rotary driving device is used to drive the clamping component to rotate around the X-axis direction;

[0029] A first rotary table is used to drive the workpiece mechanism to rotate around the Y-axis direction;

[0030] A longitudinal translation mechanism is used to drive the workpiece mechanism to translate along the X-axis direction;

[0031] An inner cylindrical grinding mechanism is connected to the inner cylindrical grinding wheel and drives the inner cylindrical grinding wheel to rotate around the X-axis direction;

[0032] An inner thread grinding mechanism is connected to the inner thread grinding wheel and drives the inner thread grinding wheel to rotate around the X-axis direction;

[0033] A second rotary table is used to drive the inner thread grinding mechanism to rotate around the Z-axis direction;

[0034] A lifting mechanism is used to drive the inner thread grinding mechanism to lift along the Y-axis direction;

[0035] A transverse translation mechanism is used to drive the inner cylindrical grinding mechanism and the inner thread grinding mechanism to translate along the Z-axis direction;

[0036] The inner circle grinding mechanism and the inner thread grinding mechanism are arranged at a distance along the Z-axis direction and are both arranged on the same side of the workpiece mechanism in the X-axis direction, the inner circle grinding mechanism and the inner thread grinding mechanism are both the ultrasonic vibration atomization mechanism, the end of the vibration module of the inner circle grinding mechanism is connected with the inner circle grinding wheel, and the end of the vibration module of the inner thread grinding mechanism is connected with the inner thread grinding wheel.

[0037] The ultrasonic vibration atomization mechanism and the grinding system of the screw nut disclosed by the application have the following advantages compared with the prior art: on the one hand, the vibration module can drive the grinding wheel or the workpiece to vibrate, so as to meet the technical requirements and use requirements of high precision and high surface quality of the inner thread tooth type of the hole workpiece, and on the other hand, the vibration module can drive the atomization nozzle to vibrate, so that the grinding fluid is atomized, the use amount of the grinding fluid can be reduced, the capillary effect is generated between the abrasive and the workpiece, the grinding fluid is more easily introduced between the abrasive and the workpiece, and the cooling and lubricating effect of the grinding fluid is improved. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to make the content of the application more easily understood, the application will be further described in detail below according to specific embodiments of the application and in combination with the drawings.

[0039] Figure 1 A schematic view of the ultrasonic vibration atomization mechanism disclosed by the first embodiment of the application;

[0040] Figure 2 A partial sectional view of the ultrasonic vibration atomization mechanism disclosed by the first embodiment of the application;

[0041] Figure 3 A schematic view of the ultrasonic vibration atomization mechanism disclosed by the second embodiment of the application;

[0042] Figure 4 A schematic view of the grinding system of the screw nut disclosed by the third embodiment of the application from one angle;

[0043] Figure 5 A schematic view of the grinding system of the screw nut disclosed by the fourth embodiment of the application from another angle.

[0044] DESCRIPTION OF DRAWINGS

[0045] A, ultrasonic vibration atomization mechanism; 101, containing shell; 102, ultrasonic power supply; 103, transducer; 104, first rotating support; 105, bearing; 106, baffle sleeve; 107, first insulating component; 108, second insulating component; 109, first conductive slip ring; 110, second conductive slip ring; 111, first carbon brush; 112, first spring; 113, second carbon brush; 114, second spring; 115, first amplitude bar; 116, second amplitude bar; 1161, helical groove; 117, modal conversion rod; 118, vibration absorption groove / hole; 119, vibration absorption cavity; 120, pre-tightening force adjusting ring; 121, stator; 122, rotor; 123, grinding wheel rod;

[0046] 201, atomizing nozzle; 202, infusion rod; 203, infusion pump; 204, liquid storage tank; 205, flow display table; 206, flow regulating valve; 207, one-way valve; 208, rotary joint; 209, suction nozzle component; 210, cooling negative pressure device; 211, filter; 212, magnetic filter membrane; 213, vernier; 214, proximity sensor; 215, atomizing inclined small hole; 216, atomizing straight small hole;

[0047] B, screw nut; C, grinding wheel;

[0048] D, workpiece mechanism; 301, second rotating support; 302, clamping component; 303, annular groove;

[0049] E, advancing mechanism; F, first rotary table; G, longitudinal translation mechanism; H, internal grinding mechanism; I, internal thread grinding mechanism; J, second rotary table; K, lifting mechanism; L, transverse translation mechanism; M, third rotary table. DETAILED DESCRIPTION

[0050] The present application will be further described below in conjunction with the drawings and specific embodiments, so that those skilled in the art can better understand the present application and implement it, but the embodiments are not limiting to the present application.

[0051] Example One

[0052] Referring to Figure 1 and Figure 2 , an embodiment of the ultrasonic vibration atomization mechanism in the present application is shown.

[0053] The above-mentioned ultrasonic vibration atomization mechanism A includes a body part and an atomization part;

[0054] The body part includes a containing shell 101, an ultrasonic power supply 102, a transducer 103, and a vibration module. The containing shell 101 is provided with a containing cavity having a first end facing the negative direction of the X axis and a last end facing the positive direction of the X axis. The last end of the containing cavity is open. The ultrasonic power supply 102 is used to provide an electrical signal. The transducer 103 is arranged in the containing cavity and is connected to the ultrasonic power supply 102 and used to convert the electrical signal into mechanical vibration of the same frequency. The vibration module has a first end facing the negative direction of the X axis and a last end facing the positive direction of the X axis. The first end of the vibration module is connected to the transducer 103. The last end of the vibration module is connected to a vibrating component. The vibration module is connected to the containing shell 101.

[0055] The atomization part includes an atomization nozzle 201, a liquid delivery rod 202, a liquid pump 203, and a liquid storage tank 204. The atomization nozzle 201 is used to spray misty grinding liquid. The atomization nozzle 201 is connected to the last end of the vibration module. The liquid delivery rod 202 is coaxially fixed inside the vibration module. One end of the liquid delivery rod 202 is communicated with the atomization nozzle 201. The liquid pump 203 is used to deliver grinding liquid. The outlet of the liquid pump 203 is communicated with the other end of the liquid delivery rod 202 through a liquid delivery pipeline. The liquid storage tank 204 is used to store grinding liquid. The liquid storage tank 204 is connected to the inlet of the liquid pump 203.

[0056] The containing shell 101 is used as the mounting base of the vibration module. The vibration module is mounted on the inside of the containing shell 101. The containing shell 101 is a cylinder. The main part of the vibration module is a long rod extending along the X axis direction. The ultrasonic power supply 102 is essentially a power generator which generates a sine signal of a certain frequency and transmits the signal to the transducer 103 through a cable connection line. The transducer 103 converts the electrical signal provided by the ultrasonic power supply 102 into mechanical vibration of the same frequency and finally transmits it to the vibrating component.

[0057] The left end of the atomizing nozzle 201 is connected with the vibration module, and the right end is a spherical body, and the oil injection orifices of the same orientation are distributed on the spherical surface. Due to the high-frequency ultrasonic vibration of the right end spherical body, the grinding fluid is atomized to generate gaseous micro-particle cooling and lubricating gas, which fills the inner hole of the hole workpiece, so that the grinding wheel is fully cooled. The generated micro-particle lubricating gas can increase the cooling effect, so that the size error caused by temperature rise in grinding is greatly reduced. Microscopically, due to the micro-separation effect and capillary effect generated by the high-frequency ultrasonic vibration between the hole workpiece and the grinding wheel, the lubricating gas really enters the rake and flank surfaces of the abrasive grains, the abrasive grains are fully lubricated and cooled, the friction between the abrasive grains and the hole workpiece is reduced, the grinding force is further reduced, and the grinding precision and stability are improved. In addition, due to the high-frequency ultrasonic reciprocating vibration impact and sufficient lubrication between the micro-units of the hole workpiece processing area and the abrasive grains of the grinding wheel, the processed surface of the hole workpiece occurs uniform micro-plastic flow, the grain is refined, the micro-hardness is improved, the fatigue life and corrosion resistance are greatly improved.

[0058] The infusion rod 202 passes through the vibration module, one end of which extends out of the end face of the front end of the vibration module, and the other end of which extends out of the end face of the rear end of the vibration module. The infusion rod 202 is relatively fixed with the vibration module and rotates coaxially and synchronously. The atomizing part further comprises a flow display table 205, a flow regulating valve 206 and a one-way valve 207 arranged on the infusion pipeline thereof. The infusion rod 202 and the infusion pipeline are connected through a rotary joint 208, so that the infusion rod 202 and the infusion pipeline can not only rotate relatively, but also flow with the grinding fluid.

[0059] On the one hand, the vibration module can drive the grinding wheel or the workpiece to vibrate, meeting the technical requirements and use requirements of high precision and high surface quality of the hole workpiece internal thread tooth type, and on the other hand, the vibration module can drive the atomizing nozzle 201 to vibrate, so that the grinding fluid is atomized, not only reducing the use amount of the grinding fluid, but also generating capillary effect between the abrasive and the workpiece, so that the grinding fluid is more easily entered between the abrasive and the workpiece, improving the cooling and lubricating effect of the grinding fluid.

[0060] In the embodiment, the body part further comprises a first rotating support 104, and the accommodating shell is rotatably connected to the inner side of the first rotating support 104 around the X-axis direction.

[0061] The workpiece to be vibrated is a screw nut A, and the end of the vibration module is threadedly connected to the first end of the screw nut A. Specifically, the vibration module is threadedly connected to the screw nut A. When the screw nut A is ground, the screw nut A needs to rotate, and therefore the vibration module also needs to be able to rotate with the screw nut A. At this time, by providing the first rotating support, the accommodating housing 101 is allowed to rotate, the vibration module can be connected to the screw nut and rotate with the screw nut, and ultrasonic vibration is applied to the screw nut A. The rotation speed of the screw nut A is relatively slow, the size of the vibration module can be designed to be relatively large according to the need, and a small-power power supply can meet the requirement of high frequency and large amplitude. By means of ultrasonic auxiliary grinding, the grinding force is greatly reduced, the grinding wheel is less blocked, the grinding wheel grit is sharpened, and the surface finish, size accuracy and geometric accuracy of the workpiece are improved.

[0062] The body part further comprises bearings 105, a retaining sleeve 106, a first insulating part 107 and a second insulating part 108. The accommodating housing is connected to the inner side of the first rotating support 104 through two bearings 105 arranged at a distance along the X-axis direction. The retaining sleeve 106 is arranged between the two bearings 105. The first insulating part 107 is connected to the end of the accommodating housing 101. The second insulating part 108 is connected to the end of the first rotating support 104.

[0063] The ultrasonic vibration assembly further comprises a first conductive slip ring 109, a second conductive slip ring 110, a first carbon brush 111, a first spring 112, a second carbon brush 113 and a second spring 114. The first conductive slip ring 109 and the second conductive slip ring 110 are connected to the first insulating part 107. The first conductive slip ring 109 and the second conductive slip ring 110 are respectively connected to the positive and negative poles of the transducer 103 through power supply lines. The first carbon brush 111, the first spring 112, the second carbon brush 113 and the second spring 114 are connected to the second insulating part 108. The first carbon brush 111 is connected to the positive pole of the ultrasonic power supply 102 through a power supply line. The second carbon brush 113 is connected to the negative pole of the ultrasonic power supply 102 through a power supply line. The first spring 112 applies an elastic restoring force to the first carbon brush 111. The first carbon brush 111 is in contact with the first conductive slip ring 109 under the elastic force of the first spring 112. The second spring 114 applies an elastic restoring force to the second carbon brush 113. The second carbon brush 113 is in contact with the second conductive slip ring 110 under the elastic force of the second spring 114. The vibration module and the ultrasonic power supply 102 can be electrically connected and relatively rotated. The vibration module in the embodiment drives the screw nut A to longitudinally vibrate and torsionally vibrate.

[0064] In the embodiment, the vibration module further comprises a first amplitude transformer 115, a second amplitude transformer 116, and a mode conversion rod 117. The first amplitude transformer 115 and the second amplitude transformer 116 are used to transmit and amplify the vibration amplitude. The mode conversion rod 117 is used to convert the longitudinal vibration into longitudinal torsional vibration, adjust the vibration parameters, and amplify the vibration amplitude. The first amplitude transformer 115 is connected to the transducer 103. The second amplitude transformer 116 is connected to the first amplitude transformer 115. One end of the mode conversion rod 117 is connected to the second amplitude transformer 116, and the other end is connected to the vibrated component.

[0065] The first amplitude transformer 115 and the second amplitude transformer 116 are important components of the vibration module. They mainly amplify the particle displacement or speed of mechanical vibration and concentrate ultrasonic energy on a small area, i.e., energy concentration. By setting two-stage amplitude transformers, the amplitude can be better amplified, and a small-power power supply can achieve the function of high-frequency large-amplitude. Specifically, the first amplitude transformer 115 is a trapezoidal 1 / 4 wavelength amplitude transformer with an amplification factor of 1.8. The second amplitude transformer 116 is a trapezoidal 1 / 2 wavelength amplitude transformer with an amplification factor of 2.5. The mode conversion rod 117 is actually an axis body with a spiral groove on the outer wall. The mode conversion rod 117 not only converts ultrasonic longitudinal vibration into longitudinal torsional vibration, but also has the functions of ultrasonic parameter adjustment and ultrasonic amplitude amplification.

[0066] In the embodiment, the first amplitude transformer 115 is integrally formed with a first support part, and the second amplitude transformer 116 is integrally formed with a second support part. The first support part and the second support part are both connected to the accommodating shell 101.

[0067] The first support part and the second support part are both annular plates. The annular plates are provided with vibration absorption grooves / holes 118, i.e., annular straight grooves (or inclined grooves), and small straight holes (or inclined holes) are arranged at the bottom of the annular plates. The first support part and the second support part form a vibration absorption cavity 119.

[0068] The annular plate has a first plate surface and a second plate surface in the X-axis direction, the first plate surface is arranged opposite to the second plate surface, the damping and vibration absorption groove / hole 118 comprises an annular groove, and a plurality of uniformly distributed small through holes (straight or inclined) are arranged on the bottom of the annular groove, the annular groove surrounds the X-axis direction, the cross section of the annular groove can be a straight groove, or a tapered groove with a wide notch and a narrow bottom, the plurality of uniformly distributed small through holes are arranged on the groove bottom of the annular groove at intervals along the X-axis direction and penetrate through the groove bottom of the annular groove, the notch of part of the annular groove penetrates through the first plate surface, at this time, the through hole also penetrates through the second plate surface, and the notch of another part of the annular groove penetrates through the second plate surface, at this time, the through hole also penetrates through the first plate surface. Due to the arrangement of the damping and vibration absorption groove / hole 118 and the damping and vibration absorption cavity 119, multi-dimensional damping and vibration absorption is realized, that is, the high-frequency multi-dimensional radial / circumferential / axial vibration from the ultrasonic system can be damped / absorbed, and the low-frequency multi-dimensional vibration from the bearing can also be damped / absorbed, and the micro ultrasonic vibration at the fixed points of the primary amplitude transformer 115 and the secondary amplitude transformer 116 is not transmitted to the bearing. The ultrasonic device in the embodiment drives the lead screw nut A to perform ultrasonic longitudinal vibration and torsional vibration.

[0069] The first support part and the second support part determine a straight line, which can improve the axial vibration accuracy of the vibration module and reduce the end face jump and the axial total jump of the output end of the vibration module. The first support part is integrally formed with the first amplitude rod 115, and the second support part is integrally formed with the second amplitude rod 116, so that the entire vibration module can be conveniently installed in the mounting hole.

[0070] In the embodiment, the second support part is connected to the end surface of the mounting hole through a bolt, and a pre-tightening force adjusting ring 120 is arranged between the second support part and the end surface of the mounting hole, and the axial pre-tightening force is adjusted by adjusting the size of the pre-tightening force adjusting ring 120 along the X-axis direction.

[0071] When the size of the pre-tightening force adjusting ring 120 along the X-axis direction is small, the extrusion force between the first amplitude rod 115 and the second amplitude rod 116 is large, that is, the axial pre-tightening force is large, and therefore the load resistance of the vibration module is good. The load resistance of the vibration module can be adjusted by adjusting the pre-tightening force adjusting ring 120.

[0072] In the embodiment, the infusion rod 202 is an externally threaded rod with a hollow channel, and the infusion rod 202 is threadedly connected to the inside of the vibration module.

[0073] The inside of the vibration module is provided with a hollow channel, the hollow channel is provided with an internal thread, and the infusion rod 202 is threadedly connected to the hollow channel, so that the infusion rod 202 can be conveniently disassembled and replaced.

[0074] In the embodiment, the atomizing part further comprises a suction nozzle 209 arranged at the port side of the hole workpiece away from the vibration module, and a cooling negative pressure device 210 connected to the suction nozzle 209 and the liquid storage tank 204, and used for providing negative pressure for the suction nozzle 209 and cooling and liquefying the sucked atomized grinding fluid and then returning the atomized grinding fluid to the liquid storage tank 204.

[0075] The suction nozzle 209 is connected to the cooling negative pressure device 210 through a liquid conveying pipeline, and the cooling negative pressure device 210 is connected to the liquid storage tank 204 through a liquid conveying pipeline. The hot lubricating gas in the inner hole of the hole workpiece is quickly sucked away by the suction nozzle arranged at the right end of the hole workpiece, and the grinding temperature is obviously reduced. The lubricating gas with heat is changed into liquid state by the cooling negative pressure device 210 and returned to the liquid storage tank through the liquid conveying pipeline.

[0076] In the embodiment, the liquid storage tank 204 comprises a clean oil area and a return oil area, the clean oil area is connected to the liquid conveying pump 203, the return oil area is connected to the cooling negative pressure device 210, and a filter 211 and a magnetic filter membrane 212 are arranged between the return oil area and the clean oil area.

[0077] The grinding fluid in the return oil area passes through the filter 211 and the magnetic filter membrane 212 to remove impurities, enters the clean oil area, and is reused. The return oil area is further provided with a vernier 213 and a proximity sensor 214.

[0078] Embodiment two

[0079] Referring to Figure 3 , one embodiment of the ultrasonic vibration atomizing mechanism in the application. The rest is the same as embodiment one, and the difference is that in the embodiment, the vibration module does not comprise the modal conversion rod, and a spiral groove 1161 is arranged on the second amplitude rod 116 to convert the ultrasonic longitudinal vibration into longitudinal vibration and torsional vibration.

[0080] The inner side of the first rotating support 104 is provided with a stator 121, and the outer side of the accommodating shell 101 is provided with a rotor 122, the stator 121 and the rotor 122 interact to drive the accommodating shell 101 to rotate, the first rotating support 104, the accommodating shell 101, the stator 121 and the rotor 122 form an electric spindle, and the vibration module further comprises a grinding wheel rod 123 at the end thereof and used for connecting the grinding wheel C.

[0081] The accommodating shell 101 is a rotating shaft of the electric spindle, the first rotating support 104 is a shell of the electric spindle, the rear end of the second amplitude lever 116 is fixedly connected with the grinding wheel lever 123 through a heat shrink process, and the grinding wheel C is glued to the grinding wheel lever 123. The atomizing nozzle 201 is located on one side of the grinding wheel C, and the grinding wheel lever 123 is further provided with an atomizing inclined small hole 215 and an atomizing straight small hole 216 located on the other side of the grinding wheel C. The atomizing inclined small hole 215 and the atomizing straight small hole 216 are used for spraying grinding fluid. The atomizing inclined small hole 215 forms an acute angle with the axial direction of the grinding wheel lever 123, and the atomizing straight small hole 216 is perpendicular to the axial direction of the grinding wheel lever 123. In the embodiment, the ultrasonic vibration mechanism drives the grinding wheel C to torsionally vibrate.

[0082] Embodiment three

[0083] Referring to Figure 4 and Figure 5 an embodiment of the grinding system of the screw nut in the application

[0084] The grinding system of the screw nut comprises:

[0085] The ultrasonic vibration atomizing mechanism A in Embodiment one, the first rotating support 104 and the accommodating shell are lockably locked through a locking component; the transducer 103 is connected with the ultrasonic power supply 102; and the end of the vibration module is threadedly connected with the screw nut B;

[0086] The workpiece mechanism D, the workpiece mechanism D comprises a second rotating support 301, a clamping component 302 and a rotating driving device (not shown in the figure), the clamping component 302 is rotatably connected to the inner side of the second rotating support 301 in the X-axis direction, is used for fixing the screw nut A and keeping the axial direction of the screw nut A as the X-axis direction, and the rotating driving device is used for driving the clamping component 302 to rotate in the X-axis direction;

[0087] The advancing mechanism E, the advancing mechanism E is used for driving the ultrasonic vibration atomizing mechanism A to translate along the X-axis direction;

[0088] The first rotary table F, the first rotary table F is used for driving the workpiece mechanism D to rotate in the Y-axis direction;

[0089] The longitudinal translation mechanism G, the longitudinal translation mechanism G is used for driving the ultrasonic vibration atomizing mechanism and the workpiece mechanism D to translate along the X-axis direction;

[0090] The internal grinding mechanism H, the internal grinding mechanism H is connected with an internal grinding grinding wheel and drives the internal grinding grinding wheel to rotate in the X-axis direction;

[0091] The internal thread grinding mechanism I, the internal thread grinding mechanism I is connected with an internal thread grinding wheel and drives the internal thread grinding wheel to rotate in the X-axis direction;

[0092] A second rotary table J is used to rotate the internal thread grinding mechanism I around the Z-axis direction;

[0093] A lifting mechanism K is used to lift the internal thread grinding mechanism I along the Y-axis direction;

[0094] A lateral translation mechanism L is used to translate the internal cylindrical grinding mechanism H and the internal thread grinding mechanism I along the Z-axis direction;

[0095] The ultrasonic vibration atomization mechanism A is arranged on one side of the X-axis direction of the workpiece mechanism D;

[0096] The internal cylindrical grinding mechanism H and the internal thread grinding mechanism I are arranged at a distance along the Z-axis direction and are both arranged on the other side of the X-axis direction of the workpiece mechanism D.

[0097] The internal cylindrical grinding mechanism H is used to grind the tooth top of the thread, and the internal thread grinding mechanism I is used to grind the tooth groove of the thread. When the internal thread grinding mechanism works, the second rotary table J is rotated to the required thread rise angle and is kept at this angle, while the lifting mechanism K is lifted or lowered to the specified height to ensure that the center height of the grinding wheel is unchanged, and the internal thread grinding is performed.

[0098] Before processing, the end of the vibration module is connected with the first end of the screw nut A, and the steps are as follows: the first rotating support and the containing shell are locked into an integral whole by the locking part (the containing shell cannot rotate relative to the first rotating support 104), at this time, the end of the vibration module cannot rotate, the ultrasonic vibration atomization mechanism is driven by the advancing mechanism E to approach the screw nut A along the X-axis direction, and the workpiece mechanism D drives the screw nut A to rotate, and the external thread of the end of the vibration module is connected with the internal thread of the screw nut A. When the advancing mechanism E is in place, the system sends a signal to the locking part, and the first rotating support 104 and the containing shell are unlocked. The containing shell can rotate with the rotating screw nut A. At this time, the second end of the screw nut A can be ground.

[0099] When the second end of the screw nut A is machined, the steps are as follows: the transverse translation mechanism L first drives the internal grinding mechanism H to face the second end of the screw nut A, and the internal grinding mechanism H can first machine the screw nut A. During the machining process, the workpiece mechanism D drives the screw nut A to rotate around the X-axis direction, the longitudinal translation mechanism G drives the screw nut A to translate along the X-axis direction, and the internal grinding mechanism H drives the internal grinding wheel to rotate around the X-axis direction, while the internal grinding wheel performs spiral motion relative to the screw nut. After the internal grinding of the screw nut is completed, the second rotary table J and the lifting mechanism K adjust the internal thread grinding wheel to the set helix angle and height, the transverse translation mechanism L drives the internal thread grinding mechanism I to face the second end of the screw nut A, the workpiece mechanism D drives the screw nut A to rotate around the X-axis direction, the longitudinal translation mechanism G drives the screw nut A to translate along the X-axis direction, and the internal thread grinding mechanism I drives the internal thread grinding wheel to rotate around the X-axis direction, while the internal thread grinding wheel performs spiral motion relative to the screw nut A, completing the internal circle and internal thread grinding of the second end of the screw nut A.

[0100] When the first end of the screw nut A is machined, the end of the vibration module is first separated from the screw nut A, and the steps are as follows: the end of the vibration module is connected to the screw nut A, the first rotating support and the containing shell are locked into one whole body (the containing shell cannot rotate relative to the first rotating support 104) through the locking part, the above-mentioned advancing mechanism E drives the ultrasonic vibration atomization mechanism to move away from the screw nut A along the X-axis direction, and the workpiece mechanism D drives the screw nut A to rotate. When the advancing mechanism E retreats to the position, the system gives a signal that the position is reached, and the external thread of the end of the vibration module is separated from the internal thread of the screw nut A. At this time, the first rotary table F drives the workpiece mechanism D to rotate 180°. After the first rotary table rotates 180° to the position, the system gives a signal, and at this time, the end of the vibration module is connected to the second end of the screw nut A according to the above steps. At this time, the first end of the screw nut A can be ground according to the above steps.

[0101] Specifically, the locking component is a hydraulic locking component. The advancing mechanism E includes an advancing drive device and an advancing guide rail. The advancing drive device is an electro-hydraulic actuator, which slides on the advancing guide rail (linear guide rail) and is equipped with a force control feedback system, which can adjust the output force in real time to achieve constant force output and ensure smooth and effective connection between the ultrasonic vibration atomization mechanism and the screw nut A. The advancing mechanism E is also equipped with a position detection component, which can provide a position to position signal to control the clamping and loosening of the locking component, i.e., the locking and unlocking of the first rotating support 104 and the accommodating housing. Thus, the screw nut A and the vibration module can be automatically disassembled. The clamping component 302 is connected to the second rotating support 301 through a bearing. The clamping component 302 is a hydraulic clamping component, which can provide a stable clamping force of up to 7 MPa to clamp the screw nut A through the convex circular rings arranged at two nodes during grinding. The rotating drive device is a servo motor. The second rotating support 301 is installed on the first rotary table F, which drives the second rotating support 301 to rotate around the Y-axis direction. The hydraulic clamping component is a hydraulic expansion vibration absorbing sleeve. The inner hole of the hydraulic expansion vibration absorbing sleeve is provided with staggered annular grooves 303. The end face of the hydraulic expansion vibration absorbing sleeve is provided with a blind hole to form a hydraulic expansion vibration absorbing sleeve with axial vibration absorption, circumferential vibration absorption, and hydraulic vibration absorption functions, which ensures that the ultrasonic vibration generated on the screw nut A cannot be transmitted to the bearings of the workpiece mechanism, thereby avoiding micro-abrasion of the bearings and reducing the rotation accuracy. The first rotary table F is configured with a large-torque, high-rigidity, and high-positioning-accuracy servo motor, which can achieve a positioning accuracy of less than 10 Arcsec and effectively ensure the accurate positioning of the workpiece mechanism D when rotating 180°. Both the inner grinding wheel and the inner thread grinding wheel include a high-speed electric spindle, which drives the grinding wheel to perform grinding. The electric spindle can achieve a maximum speed of 60,000 revolutions, adopts oil-gas lubrication and water cooling, and effectively ensures the accuracy and end face runout of the spindle. The second rotary table J is installed on the column, which is provided with a roller linear guide rail. The box body of the second rotary table J is dragged by the lifting mechanism K along the Y-axis direction in the vertical direction to make linear reciprocating motion. The lifting mechanism K includes a roller screw, a servo drive motor, bearings, and other key components, which are installed in a fixed manner at both ends. During assembly, the screw is pre-stretched to effectively reduce the adverse effects of temperature rise on the accuracy of the screw, thereby ensuring the running accuracy of the screw. The lifting mechanism K and the horizontal translation mechanism L are equipped with an absolute value linear grating ruler with a measurement step of 0.001 μm, which forms a closed-loop system with the lifting mechanism K and the horizontal translation mechanism to ensure accurate positioning of each axis.The absolute value formula linear grating ruler (measuring component) is driven by an electro-hydraulic actuator, the electro-hydraulic actuator has a force control device, and a constant ejection force can be output, so that the (measuring component) can be protected from sudden impact and damage; when the measuring component is working, the electro-hydraulic actuator ejects the measuring component, measures the point coordinate required by the measuring component, and feeds back to the machine tool system, after completing the measuring action, the electro-hydraulic actuator retracts the measuring component and hides behind the metal plate, so that the measuring component is protected from damage by cutting fluid or other debris.

[0102] In the embodiment, the tool unit further comprises a third rotary table M, and the third rotary table M is used to drive the internal grinding mechanism H to rotate around the Y-axis direction.

[0103] When the internal thread grinding mechanism I is machining, the internal grinding mechanism H may interfere with the workpiece mechanism D, at this time, the internal grinding mechanism H is driven by the third rotary table M to rotate counterclockwise by 90°, avoiding the interference position.

[0104] Embodiment Four

[0105] The rest is the same as embodiment three, the difference is that the ultrasonic vibration atomization mechanism is not arranged on the side of the X-axis direction of the workpiece mechanism, the internal grinding mechanism and the internal thread grinding mechanism are the ultrasonic vibration atomization mechanism in embodiment two, the end of the vibration module of the internal grinding mechanism is connected with the internal grinding wheel, and the end of the vibration module of the internal thread grinding mechanism is connected with the internal thread grinding wheel.

[0106] Obviously, the above embodiments are only examples for clearly illustrating, and are not intended to limit the embodiments. For those skilled in the art, on the basis of the above description, other different forms of changes or variations can also be made. Here, all the embodiments do not need to be exhausted, and the obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. An ultrasonic vibration atomization mechanism, characterized in that: It includes a main body part and an atomizing part; The main body includes a housing, an ultrasonic power supply, a transducer, a vibration module and a first rotating support. The housing is provided with a housing cavity, the housing cavity has a head end facing the negative direction of the X-axis and an end facing the positive direction of the X-axis, and the end of the housing cavity is open. The ultrasonic power supply is used to provide an electrical signal. The transducer is provided in the housing cavity. The transducer is connected to the ultrasonic power supply and is used to convert the electrical signal into mechanical vibration of the same frequency; the vibration module has a head end facing the negative direction of the X-axis and an end facing the positive direction of the X-axis. The head end of the vibration module is connected to the transducer, and the end of the vibration module is connected to the vibrated component. The vibration module is connected to the housing, and the housing is rotatable around the X-axis and connected to the inner side of the first rotating support. A stator is provided on the inner side of the first rotating support, and a rotor is provided on the outer side of the housing. The stator and the rotor interact to drive the housing to rotate. The first rotating support, the housing, the stator and the rotor constitute an electric spindle. The end of the vibration module is connected to the grinding wheel rod. The atomizing part includes an atomizing nozzle, an infusion rod, an infusion pump, a liquid reservoir, a nozzle component, and a cooling negative pressure device. The atomizing nozzle is used to spray a mist of grinding fluid and is connected to the end of the vibration module. The infusion rod is coaxially fixed inside the vibration module, and one end of the infusion rod is connected to the atomizing nozzle; the infusion pump is used to deliver the grinding fluid, and the outlet of the infusion pump is connected to the other end of the infusion rod through an infusion pipeline. The liquid storage tank is used to store grinding fluid, and the liquid storage tank is connected to the inlet of the infusion pump through an infusion pipeline. The suction nozzle component is arranged on the port side of the hole workpiece away from the vibration module, and the suction nozzle component is used to suck out the mist grinding fluid in the hole workpiece. The cooling negative pressure device is connected to the suction nozzle component and the liquid storage tank. The cooling negative pressure device is used to provide negative pressure for the suction nozzle component and cool and liquefy the sucked out mist grinding fluid and then send it back to the liquid storage tank.

2. The ultrasonic vibration atomization mechanism according to claim 1, characterized in that: The infusion rod is an externally threaded rod with a hollow channel, and the infusion rod is threadedly connected to the interior of the vibration module.

3. The ultrasonic vibration atomization mechanism according to claim 1, characterized in that: The liquid storage tank includes an oil return area and an oil clean area. The oil return area is connected to the cooling negative pressure device, and the oil clean area is connected to the infusion pump. A filter and a magnetic filter membrane are provided between the oil return area and the oil clean area.

4. The ultrasonic vibration atomization mechanism according to claim 1, characterized in that: The vibration module includes a first horn, a second horn and a mode conversion rod. The first horn and the second horn are used to transmit and amplify the vibration amplitude. The mode conversion rod is used to decompose the longitudinal vibration into longitudinal and torsional vibration, adjust the vibration parameters and amplify the vibration amplitude. The first horn is connected to the transducer, the second horn is connected to the first horn, one end of the mode conversion rod is connected to the second horn, and the other end is connected to the vibrated component.

5. The ultrasonic vibration atomization mechanism according to claim 4, characterized in that: The first horn is integrally formed with a first support portion, and the second horn is integrally formed with a second support portion. Both the first support portion and the second support portion are connected to the accommodating shell.

6. A grinding system for a screw nut, characterized in that: include: The ultrasonic vibration atomization mechanism according to any one of claims 1 to 5, wherein the first rotating support and the accommodating housing are unlockably locked by a locking component, and the end of the vibration module is threadedly connected to a screw nut; A workpiece mechanism, comprising a second rotating support, a clamping component, and a rotary drive device, wherein the clamping component is rotatably connected to the inner side of the second rotating support about the X-axis direction and is used to fix the screw nut and maintain the axial direction of the screw nut in the X-axis direction, and the rotary drive device is used to drive the clamping component to rotate about the X-axis direction; A propulsion mechanism, the propulsion mechanism being used to drive the ultrasonic vibration atomization mechanism to translate along the X-axis direction; A first turntable, the first turntable is used to drive the workpiece mechanism to rotate around the Y-axis direction; A longitudinal translation mechanism, the longitudinal translation mechanism is used to drive the ultrasonic vibration atomization mechanism and the workpiece mechanism to translate along the X-axis direction; An internal grinding mechanism, the internal grinding mechanism being connected to an internal grinding wheel and driving the internal grinding wheel to rotate about the X-axis direction; An internal thread grinding mechanism, the internal thread grinding mechanism being connected to an internal thread grinding wheel and driving the internal thread grinding wheel to rotate about the X-axis direction; a second turntable, the second turntable being used to drive the internal thread grinding mechanism to rotate around the Z-axis; A lifting mechanism, the lifting mechanism is used to drive the internal thread grinding mechanism to move up and down along the Y-axis direction; A lateral translation mechanism, the lateral translation mechanism is used to drive the internal grinding mechanism and the internal thread grinding mechanism to translate along the Z-axis direction; Among them, the ultrasonic vibration atomization mechanism is arranged on one side of the workpiece mechanism in the X-axis direction; the internal cylindrical grinding mechanism and the internal thread grinding mechanism are arranged at intervals along the Z-axis direction and are both arranged on the other side of the workpiece mechanism in the X-axis direction.

7. A grinding system for a screw nut, characterized in that: include: A workpiece mechanism, comprising a second rotating support, a clamping component, and a rotary drive device, wherein the clamping component is rotatably connected to the inner side of the second rotating support about the X-axis direction and is used to fix the screw nut and maintain the axial direction of the screw nut in the X-axis direction, and the rotary drive device is used to drive the clamping component to rotate about the X-axis direction; A first turntable, the first turntable is used to drive the workpiece mechanism to rotate around the Y-axis direction; A longitudinal translation mechanism, the longitudinal translation mechanism is used to drive the workpiece mechanism to translate along the X-axis direction; An internal grinding mechanism, the internal grinding mechanism being connected to an internal grinding wheel and driving the internal grinding wheel to rotate about the X-axis direction; An internal thread grinding mechanism, the internal thread grinding mechanism being connected to an internal thread grinding wheel and driving the internal thread grinding wheel to rotate about the X-axis direction; a second turntable, the second turntable being used to drive the internal thread grinding mechanism to rotate around the Z-axis; A lifting mechanism, the lifting mechanism is used to drive the internal thread grinding mechanism to move up and down along the Y-axis direction; A lateral translation mechanism, the lateral translation mechanism is used to drive the internal grinding mechanism and the internal thread grinding mechanism to translate along the Z-axis direction; In which, the internal cylindrical grinding mechanism and the internal thread grinding mechanism are arranged at a distance along the Z-axis direction and are both arranged on the same side of the X-axis direction of the workpiece mechanism. The internal cylindrical grinding mechanism and the internal thread grinding mechanism are both ultrasonic vibration atomization mechanisms as described in any one of claims 1 to 5. The end of the vibration module of the internal cylindrical grinding mechanism is connected to the internal cylindrical grinding wheel, and the end of the vibration module of the internal thread grinding mechanism is connected to the internal thread grinding wheel.

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