JP7349185B2 - Multi-energy field nano-lubricant microscale bone grinding measurement system - Google Patents

Description

The present invention relates to the technical field of grinding, and more particularly to a multi-energy field nano-lubricant microscale bone grinding measurement system.

Micro-lubrication grinding technology, nanoparticle jet micro-lubrication technology, charged spray technology, etc. are gradually being developed to address problems such as insufficient cooling capacity and poor visibility of the surgical area in micro-grinding for total knee joint replacement in clinical surgery. It is appearing. However, the inventors believe that conventional bone grinding techniques, such as ultrasonic vibration-assisted micro-grinding, nanofluidic microlubrication micro-grinding or nanofluidic microlubrication charged spray-coupled micro-grinding, can meet the requirements in actual production processing. I found it difficult.

(1) Ultrasonic vibration-assisted micro-grinding can effectively reduce grinding force damage, thermal damage and clogging of grinding tools, but the visibility of the grinding operation during processing is low and the convective heat exchange ability is insufficient. Clinical problems such as these are likely to occur. (2) Nanofluidic microlubrication micro-grinding can solve the bottlenecks of the convective heat exchange ability of the grinding area and the low visibility of the surgical area, but it is prone to the problem of microdroplet scattering during processing. (3) Nanofluid micro-lubricated charged spray coupled micro-grinding can successfully solve the problems such as low visibility, lack of convective heat exchange ability and micro-droplet scattering in clinical micro-grinding surgery, but the device It does not take into account the problem of grinding waste discharge and serious clogging of the grinding tool.

The above problems are effectively solved by combining ultrasonic vibration, nano-lubricant, charged spray and micro-grinding processing technology to form an acoustic-electric-force multi-energy field nano-lubricant micro-scale bone grinding processing technology. can. However, how to precisely control the machining parameters and realize the acoustic-electrical-force multi-energy field coupled machining process is always the central problem plaguing the technology. Moreover, the prior art lacks the real-time online detection of the grinding force, grinding temperature and nanoparticle microdroplet of multi-energy field nanolubricant microscale bone grinding.

China Utility Model No. 204671221 China Utility Model No. 209060230

Atul Babbar and 2 others, ``Thermogenesis mitigation using ultrasonic actuation during bone grinding: A hybrid approach using CEM 43°C and Arrhenius model'' ringing: a hybrid approach using CEM43°C and Arrhenius model), Journal of the Brazilian Society of Mechanical Sciences and Engineering, (2 019) 41:401 Yang Min and 5 others, “A new model for predicting the temperature field of skull grinding for neurosurgery”, JOURNAL OF MECHANICAL ENGINEERING, December 2018, Volume 54, No. 23, pp. 215-222 Lihui Zhang and 3 others, "Mist cooling in neurosurgical bone grinding", Elsevier, 2013, Vol. 62, No. 1, pp. 367-370 Albert J. Shih and 4 others, "Prediction of bone grinding temperature in skull base neurosurgery", Elsevier (ELSEVIER) , 2012, Volume 61 , No. 1, pp. 307-310 Yang Min et al., ``Predictive model of convective heat transfer coefficient in bone micro-grinding using nanofluid aerosol cooling'' Nofluid Aerosol Cooling”, Elsevier, June 2021, Volume 125, 105317

In view of the shortcomings of the prior art, the purpose of the present invention is to comprehensively consider the combined effects of ultrasonic vibration, nanofluid, and charged spray, and to detect nanoparticle microdroplets, grinding temperature, and grinding force online in real time. The purpose of the present invention is to provide a multi-energy field nano-lubricant microscale bone grinding measurement system that solves problems such as low visibility, lack of convective heat exchange ability and scattering of microdroplets in clinical microgrinding surgery. .

In order to achieve the above object, the present invention is realized by the following technical solutions.

Embodiments of the present invention provide a multi-energy field nano-lubricant microscale bone grinding measurement system, which is connected via a conductive wire to a three-dimensional displacement worktable on which a jig for clamping a workpiece is mounted. an ultrasonic vibrating device, which includes an ultrasonic generator and an ultrasonic electric spindle, and a grinding tool for grinding the workpiece is attached to the horn of the ultrasonic electric spindle, and is connected to the charged spray nozzle and the ultrasonic generator. It includes a plurality of ultrasonic vibrating rods, each ultrasonic vibrating rod is placed in a container of a different medium, each container is connected to a mixing chamber, and a micro-lubrication pump is provided between the mixing chamber and the charged spray nozzle. Equipped with a connected fluid charging spray device, a grinding force measuring section provided between the jig and the three-dimensional displacement workbench, a micro droplet measuring section and a grinding temperature measuring section provided on the side of the jig. and a measuring device.

In a further embodiment, the grinding force measuring unit includes a grinding force measuring device, an amplifier, an information collector, and a data analyzer connected in sequence, and the jig is installed above a three-dimensional displacement workbench by the grinding force measuring device. be done.

In a further embodiment, the jig includes a restriction sheet and a stopper, a restriction groove is provided in the restriction sheet for placing the workpiece, and the stopper is provided in the restriction groove and cooperates with a clamp bolt to place the workpiece. Restrict.

In a further embodiment, a flat plate is removably connected to the top of the restriction sheet, and a plurality of holding plates whose intervals are adjustable are attached to the flat plate, and the holding plates are used to limit the height direction of the workpiece. .

In a further embodiment, the ultrasound generator is connected to two ultrasonic vibrating rods, one of which is placed in a container containing saline, and the other ultrasonic vibrating rod is It is placed in a container containing the nanoparticles, and the two containers are each connected to the inlet of the mixing chamber via a hose.

In a further embodiment, a high voltage DC power source is connected between the charged spray nozzle and the workpiece.

In a further embodiment, the grinding temperature measurement unit includes a thermocouple insertable into the workpiece, the thermocouple being connected in turn to an information collector and a data analyzer.

In a further embodiment, the microdroplet measuring unit includes a camera for acquiring images of workpiece grinding, and the camera is sequentially connected to an information collector and a data analyzer.

In a further embodiment, an air levitation platform device is further provided at the bottom of the three-dimensional displacement work platform, the air levitation platform device including a bed plate, an air levitation vibration isolator and a support assembly, the air levitation vibration isolator comprising a bed plate. and the support assembly.

In a further embodiment, the upper surface of the bedplate is provided with a magnetically permeable panel and the interior of the bedplate is provided with a honeycomb core plate.

The beneficial effects of the present invention are as follows.
(1) The present invention solves problems such as clogging of grinding tools, fusion of grinding debris, lack of convective heat exchange ability, and scattering of minute droplets in the conventional micro-grinding process by using ultrasonic vibration, medical By integrating nanofluid lubrication and charged spray, we realize micro-grinding of biological bone with low damage control.
(2) The measuring device of the present invention includes a grinding force measuring section, a microdroplet measuring section provided on the side of the jig, and a grinding temperature measuring section, and measures nanoparticle microdroplets, grinding force, and grinding temperature online in real time. can be detected, which not only saves time but also avoids machining errors caused by multiple assemblies.
(3) The grinding tool of the present invention is connected to the ultrasonic horn, the grinding tool generates vibration that can meet the processing requirements, the vibration of the grinding tool head is similar to the reciprocating motion of the piston, and the ultrasonic vibration With assisted micro-grinding, the cooling fluid in the grinding area is subjected to the ultrasonic vibration of the grinding tool to generate high frequency, alternating positive and negative hydraulic shock waves, which is easier to pump in the grinding zone, accelerating the renewal of the cooling fluid in the grinding zone, Greatly enhances the convective heat exchange ability of the cooling medium, and promotes the discharge of debris and avoids clogging of the grinding tool.
(4) The present invention installs an air levitation optical platform device, and based on the vibration isolation airbag of the air levitation vibration isolator, cooperates with vibration damping liquid and high-damping small hole air to perform vibration isolation. It has excellent anti-vibration performance, and by installing an adjustment valve at the entrance, the reaction time is shortened, and a height adjustment mechanism is installed in the air floating optical platform device, which eliminates problems such as distortion and deformation of the bracket due to uneven ground. can be solved.
(5) A jig is attached to the grinding force measurement unit of the present invention, and the jig restricts the workpiece in three directions in order to ensure accuracy of information acquisition.

The drawings of the specification forming part of the invention are used to provide a further understanding of the invention, the illustrative embodiments of the invention and the description thereof are used to interpret the invention, and the drawings of the specification form part of the invention. shall not be unduly limited.

1 is an overall structural schematic diagram according to one or more embodiments of the invention; FIG. 1 is a cross-sectional view of an ultrasonic motorized spindle in accordance with one or more embodiments of the invention. FIG. 1 is a schematic illustration of the process of creating microcracks by interrupted cutting in an ultrasonic vibration microgrinding process according to one or more embodiments of the present invention; FIG. 1 is a schematic illustration of the process of creating microcracks by interrupted cutting in an ultrasonic vibration microgrinding process according to one or more embodiments of the present invention; FIG. 1 is a schematic illustration of the process of creating microcracks by interrupted cutting in an ultrasonic vibration microgrinding process according to one or more embodiments of the present invention; FIG. 1 is a schematic illustration of the process of creating microcracks by interrupted cutting in an ultrasonic vibration microgrinding process according to one or more embodiments of the present invention; FIG. FIG. 3 is a schematic illustration of grinding debris volume conversion in accordance with one or more embodiments of the present invention. 1 is a schematic diagram of a nanoparticle microlubrication charged spray structure according to one or more embodiments of the present invention. FIG. 1 is a schematic diagram of a nanoparticle microdroplet, grinding force, and grinding temperature measurement device according to one or more embodiments of the invention; FIG. 1 is a schematic illustration of a micro-grinding force meter installation and workpiece positioning and clamping apparatus according to one or more embodiments of the invention; FIG. 1 is a schematic diagram of positioning a workpiece in accordance with one or more embodiments of the invention; FIG. FIG. 2 is a cross-sectional view of a workpiece and a schematic diagram of a connection of a temperature measuring device according to one or more embodiments of the present invention. 1 is a self-leveling air-levitation anti-vibration optical platform in accordance with one or more embodiments of the present invention. 1 is a schematic illustration of a honeycomb bedplate structure in accordance with one or more embodiments of the present invention; FIG. 1 is a schematic diagram of a single degree of freedom vibration isolation system in accordance with one or more embodiments of the invention; FIG.

Example 1:

This embodiment provides a multi-energy field nanolubricant microscale bone grinding measurement system, as shown in Fig. 1, ultrasonic vibration device I, fluid charged spray device II, measurement device III, air floating platform device IV. , a three-dimensional displacement workbench, and an air floating platform device IV is installed at the bottom of the three-dimensional displacement workbench, and clamps a workpiece II-2 by a jig II-1 on the three-dimensional displacement workbench.

In this example, bovine long bones were selected as the sample material, and ultrasonic vibrator I was used to solve the problem that bovine long bones have a large grinding force and are prone to cracking due to brittle fracture during processing. Processed by ultrasonic assisted micro-grinding process.

As shown in FIG. 2, the ultrasonic vibration device I includes an ultrasonic generator I-1 and an ultrasonic electric spindle I-2, and an ultrasonic transducer I-3 and an ultrasonic generator of the ultrasonic electric spindle I-2. I-1 is connected via a conductive wire, and the alternating current of the ultrasonic generator I-1 supplies a high frequency electrical vibration signal to the ultrasonic transducer I-3.

The housing of the ultrasonic electric spindle I-2 is connected to an angle adjustment device to adjust the grinding angle, and at the same time, the angle adjustment device is also attached to the three-dimensional displacement workbench and moves in the X direction, Y direction, and Z direction. . The angle adjustment device is a conventional technology, and its explanation will be omitted here.

The grinding tool I-5 is connected to the horn I-4 of the ultrasonic vibration device I, and the grinding tool I-5 can generate vibrations that meet the processing requirements. As the grinding tool I-5 approaches the bone material, the volume of the grinding tool/bone gap decreases and the cooling fluid is discharged from the gap, carrying away heat and bone grinding debris, and the grinding tool I-5 moves away from the bone material. , the volume of the gap increases and fresh coolant is brought in. The ultrasonic vibration device I is attached to the spindle and rotates with it, and through ultrasonic vibration assisted micro-grinding, the cooling fluid in the grinding area is subjected to the ultrasonic vibration of the grinding tool to generate high-frequency alternating positive and negative hydraulic shock waves. It is easier to pump the grinding section, accelerates the renewal of the coolant in the grinding section, greatly enhances the convective heat exchange ability of the cooling medium, and promotes the discharge of debris, making it easier to pump the grinding tool I-5. Avoid clogging.

As shown in Fig. 3(a), when the instantaneous cutting thickness h of the abrasive particles is smaller than the minimum undeformed chip thickness h _min , it will exert plowing and rubbing action on the machined surface. alone, indicating that the abrasive particles are not cutting into the raw surface material. As shown in Fig. 3(b) to Fig. 3(c), with the increase of h, when h=h _min , the abrasive particles just contact and cut into the raw surface, and the material gradually undergoes plastic deformation. If, and there is residual stress at the bottom of the plastic deformation, and h exceeds the minimum undeformed chip thickness h _min , the material will form a chip under the action of plastic shear, and at this time the material will removed plastically.

As shown in Fig. 3(d), when the abrasive particle cuts into the raw surface material, the instantaneous cutting thickness of the abrasive particle increases from 0, and when h increases to a critical value, the final machined surface Micro-cracks including transverse cracks and intermediate cracks occur in , the grinding process changes from plastic region removal to brittle region removal, and as h gradually decreases, the grinding particles separate from the raw surface material again and reach 0. . Therefore, interrupted grinding can be realized in ultrasonic vibration micro-grinding in terms of the instantaneous cutting thickness of a single grinding particle.

Ultrasonic vibration mechanism:

Ultrasound is a vibration wave with an audible frequency of 20 kHz or higher that cannot cause a human auditory response. The ultrasonic vibration converts the high frequency signal sent from the ultrasonic power source into high frequency vibration through the transducer, and further transmits the vibration to the ultrasonic cutter through the ultrasonic horn, and superimposes the ultrasonic vibration amplitude in the axial direction. The instantaneous cutting depth of the grinding particles also changes periodically.

Ultrasonic vibration can change the maximum undeformed cutting thickness of the grinding chips and the average thickness of the grinding chips, improve the material removal rate, and infiltrate the nanofluid more fully into the grinding wheel and workpiece, thereby increasing cooling lubrication. The efficiency and utilization rate of nanofluid are greatly improved, and the schematic diagram of the conversion of the volume of grinding debris during grinding is as shown in Fig. 4, and the related calculations are as follows.

であり、ここで、

は研削工具の単位面積あたりの有効研削刃数であり、Ｃは研削屑の幅と研削屑の厚さの比、即ち

である。 According to the principle of constant volume, the maximum thickness of undeformed grinding chips is:

and here,

is the effective number of grinding teeth per unit area of the grinding tool, and C is the ratio of the width of the grinding chips to the thickness of the grinding chips, i.e.

It is.

であり、式中、

は各研削粒子の体積であり、

は研削除去されたワーク材料の体積である。 If a similar rectangular hexahedron is used to replace the fish-shaped grinding waste,

and in the formula,

is the volume of each grinding particle,

is the volume of workpiece material removed by grinding.

と書くことができ、式中、

は研削屑の平均幅であり、

（Ｃは比例係数であり、研削粒子の歯先円すい角の大きさに関連している）であり、

は研削屑の平均厚さであり、

であり、

は未変形研削屑の長さであり、その数値は幾何学的接触長さの式に応じて求めることができ、即ち

であり、

は研削工具の研削幅である。 Formula (2) is

can be written, and in the formula,

is the average width of the grinding chips,

(C is a proportionality coefficient and is related to the size of the tip cone angle of the grinding particles),

is the average thickness of the grinding chips,

and

is the length of the undeformed grinding chip, whose value can be determined according to the geometric contact length formula, i.e.

and

is the grinding width of the grinding tool.

が得られ、最大未変形切り屑厚さは、

である。 From formula (3),

is obtained, and the maximum undeformed chip thickness is

It is.

Ultrasonic vibration assisted grinding mechanism:

である。 In the micro-grinding process, the machining mechanism is mainly influenced by the ratio of the radius of the grinding particles and the undeformed chip thickness, and since the radius of the grinding particles and the undeformed chip thickness are on the same scale, the undeformed chip thickness A small amount of change in the thickness has a large impact on the processing mechanism. Considering the comprehensive effects such as size effect, minimum chip thickness principle, etc., its material removal mechanism is different from traditional machining methods. Under dynamic impact loading, the dynamic fracture toughness of the material decreases by more than 70% compared to the static fracture toughness. Therefore, instead of the static fracture toughness K _IC , we calculate the dynamic fracture toughness K _ID of the brittle material under ultrasonic vibration, i.e.

It is.

Therefore, in ultrasonic vibration end face micro-grinding, compared to conventional end face micro-grinding, the addition of ultrasonic vibration increases the relative velocity and acceleration between the grinding particles and the material, and the The dynamic impact effect becomes larger, and considering this dynamic impact effect, the micro-grinding of the ultrasonic vibration end face can more easily realize the grinding of the plastic region, and on the premise of the plastic region grinding, achieve a larger material removal rate. can.

であり、式中、αは幾何学的係数であり、βは定数であり、Ｈ_Ｖは生体骨材料の硬度であり、Ｋ_ＩＤは動的破壊靭性であり、Ｋ_Ｖは値が１より大きい影響係数であり、生体骨材料の超音波作用下での硬度変化に関連しており、Ｅは骨材料の弾性率である。Ｋ_ＩＤが増加し、Ｈ_Ｖが減少すると、硬脆材料は脆性状態から塑性状態へ変化しやすく、逆もまた同様である。したがって、超音波振動アシストマイクロ研削プロセスにおいて、超音波振動の導入によりワーク材料を軟化させる効果があり、ワーク材料の硬度Ｈ_Ｖをある程度低下させ、同時に、超音波振動の導入により、研削工具とワークとの間の弾性反発が低下し、加工プロセスがより安定し、動的衝撃作用が減少し、これは、材料の動的破壊靭性Ｋ_ＩＤの増加として現れる。したがって、式（７）～（８）から分かるように、超音波振動により臨界荷重及び臨界切削厚さが増加し、臨界切削深さは一般に通常の研削の２～３倍である。 According to indentation fracture mechanics, when the processing load is smaller than the critical load, the biological bone material is mainly removed plastically, and when the processing load is larger than the critical load, it is mainly removed by brittle fracture. The critical load F _max and critical cutting thickness h _max under ultrasonic action are:

, where α is a geometric coefficient, β is a constant, H _V is the hardness of the biological bone material, K _ID is the dynamic fracture toughness, and K _V has a value greater than 1. is the influence factor, which is related to the hardness change of biological bone material under the action of ultrasound, and E is the elastic modulus of the bone material. As K _ID increases and H _V decreases, hard brittle materials tend to change from brittle state to plastic state and vice versa. Therefore, in the ultrasonic vibration assisted micro-grinding process, the introduction of ultrasonic vibration has the effect of softening the workpiece material, reducing the hardness H _V of the workpiece material to a certain extent, and at the same time, the introduction of ultrasonic vibration has the effect of softening the workpiece material. The elastic rebound between is reduced, the processing process is more stable, and the dynamic impact effect is reduced, which is manifested as an increase in the dynamic fracture toughness K _ID of the material. Therefore, as can be seen from equations (7)-(8), ultrasonic vibration increases the critical load and critical cutting thickness, and the critical cutting depth is generally two to three times that of normal grinding.

Further, as shown in FIG. 5, the fluid charged spraying device II includes a charged spray nozzle II-6, a micro-lubrication pump II-15, a mixing chamber II-13, and an ultrasonic vibration rod II-10. -10 is connected to the ultrasonic transducer I-3, and the number of ultrasonic vibrating rods II-10 is determined according to the number of media to be mixed, and in this example, two ultrasonic vibrating rods II-10 are connected to the ultrasonic transducer I-3. One of the ultrasonic vibration rods II-10 is used to perform ultrasonic vibration on the physiological saline II-11, and the other ultrasonic vibration rod II-10 is used to perform ultrasonic vibration on the nanoparticles II-9. The nanoparticles are uniformly dispersed by the ultrasonic vibration.

The container containing nanoparticles II-9 is connected to the first inlet of the mixing chamber II-13 via a first hose II-8, and the container containing physiological saline II-11 is connected to a second hose II-12. The saline solution II-11 and the nanoparticles II-9 are mixed in the mixing chamber II-13 to form a nanofluid with a low concentration. The outlet of the mixing chamber II-13 is connected to the micro-lubrication pump II-15 via a third hose II-14, and the micro-lubrication pump II-15 is connected to the charged spray nozzle II-6 via the connection line II-7. be done.

The charged spray nozzle II-6 is connected to the high-voltage DC power supply II-4, and the micro-lubrication pump II-15 sprays the nanofluid from the charged spray nozzle II-6, and then the nanofluid droplets are connected to the high-voltage DC power supply II-4. The charged droplets are charged and sprayed to form a group of charged minute droplets, and the charged droplets are moved onto the surface of the workpiece II-2 (the workpiece II-2 is clamped by the jig II-1) in a controllable and orderly manner under the drive of an electric field force. and fixed), and plays mainly the role of lubrication and cooling during the grinding movement.

The high voltage DC power supply II-4 supplies high voltage DC power to the system, the negative current of the high voltage DC power supply II-4 is transported to the conductor II-5 of the charged spray nozzle II-6, and the positive current is transferred to the workpiece II through the conductor. -2 and grounded via ground wire II-3, ensuring that a stable electric field is formed between the nozzle and the workpiece.

Furthermore, as shown in FIG. 6, the measuring device III includes a microdroplet measuring section, a grinding force measuring section, and a grinding temperature measuring section, where the microdroplet measuring section includes a high-speed camera III-8, a third information collecting section, and a third information collecting section. a high-speed camera III-8 is connected to a third information collector III-6 via a conductor, and the third information collector III-6 is connected to a third data analyzer III-6 via a conductor. and is connected to the third data analyzer III-7.

When the grinding tool I-5 grinds the workpiece II-2 to generate a grinding force, the high-speed camera III-8 detects the combination of the nanofluid airflow field, charging field, and ultrasonic high-frequency vibration impact energy field of the nanofluid microdroplet. The motion trajectory under the action is collected and transmitted to the third information collector III-6, and finally transmitted to the third data analyzer III-7, and then the nanofluid microfluid at the grinding tool/living bone constraint interface. The formation mechanism of droplet microchannel capillaries can be analyzed.

As shown in FIG. 9, the grinding temperature measurement unit includes a thermocouple III-10, a first information collector III-2, and a first data analyzer III-1 connected in sequence, and the measurement signal is transmitted to the first information collector III-1. III-2 to the first data analyzer III-1, and the first data analyzer III-1 displays the temperature of the working end of the thermocouple III-10, ie, the workpiece II-2.

At the bottom of workpiece II-2 there is a groove for inserting thermocouple III-10. This example takes two thermocouples III-10 as an example, marked TC1 and TC2, respectively, and their working ends are located 0.5 mm and 1 mm below the upper surface of workpiece II-2, respectively, and are close to TC2. The surface of work II-2 is marked as the a-side, and the surface near TC1 is marked as the b-side. When the grinding head I-5 is ground for the first time in the direction of the arrow (a→b), TC2 is ground first and becomes the first measuring end, and TC1 becomes the second measuring end.

Furthermore, as shown in FIG. 6, the grinding force measuring section includes a grinding force measuring device III-9, an amplifier III-3, a second information collector III-5, and a second data analyzer III-4, The grinding force measuring device III-9, the amplifier III-3, the second information collector III-5, and the second data analyzer III-4 are connected to each other via conductive wires. connected sequentially. When the grinding tool I-5 grinds the workpiece II-2 to generate grinding force, the measurement signal is amplified by the amplifier III-3 and then transmitted to the second information collector III-5, and finally the second data The data is transmitted to analyzer III-4, which is a programmable controller with a display and displays the magnitude of the grinding force.

In this embodiment, as shown in FIG. 7, the base III-1107 is symmetrically attached to both sides of the grinding force measuring device III-9, and the base III-1107 and the grinding force measuring device III-9 are connected by bolts. , the base III-1107 is made of a magnetically permeable metal material, and after the workbench of the air floating platform device IV is activated, the workbench is magnetized and the base III-1107 of the grinding force measuring instrument III-9 is placed on it. It can be adsorbed.

Furthermore, a jig II-1 is attached to the grinding force measuring device III-9, and as shown in FIG. 8, the jig II-1 includes a limit sheet III-1110 and a stopper III-1104, is fixed to the workbench of the grinding force measuring device III-9, and in this embodiment, the restriction sheet III-1110 has a rectangular frame structure, and a rectangular restriction groove is cut in the restriction sheet III-1110.

As can be appreciated, in other embodiments, the restriction sheet III-1110 may be installed in other structures, as long as the restriction grooves of the restriction sheet III-1110 are adapted to the shape of the workpiece II-2.

The workpiece II-2 is attached and installed in one corner of the restriction groove, and a stopper III-1104 is installed between one side of the workpiece II-2 and the inner wall of the restriction groove, and the stopper III-1104 is attached to the first clamp bolt III- 1102 to limit the workpiece II-2 in the X direction. One surface of the stopper III-1104 is bonded to the side surface of the workpiece II-2, the other surface is bonded to the end of the first clamp bolt III-1102, and the first clamp bolt III-1102 is attached to the limit sheet III- Penetrates 1110.

The Y direction of the workpiece II-2 is restricted by the second clamp bolt III-1106 and the restriction sheet III-1110, and the second clamp bolt III-1106 passes through the restriction sheet III-1110, and its end is connected to the workpiece II-2. The other end surface of the workpiece II-2 can be attached to the end surface of the workpiece II-2 in close contact with the side wall of the restriction groove.

The Z direction of the workpiece II-2 is restricted by a plurality of holding plates, and the plurality of holding plates are installed on both sides of the workpiece II-2 in the X direction. In this embodiment, two holding plates III-1109 are installed in the positive direction of the X direction of the workpiece II-2, and of course, in other embodiments, other numbers of holding plates III-1109 may be installed. good.

Furthermore, the upper surface of the stopper III-1104 is removably connected to a first flat plate III-1105, and the first flat plate III-1105 realizes fixing of the stopper III-1104 by screwing in the mounting bolt III-1103, Gasket III-1101 is installed between III-1103 and stopper III-1104.

A second flat plate III-1111 is provided on one side of the workpiece II-2 and is removably connected to the restriction sheet III-1110, a strip-shaped hole is opened in the second flat plate III-1111, and an adjustment bolt III is installed in the strip-shaped hole. The holding plate III-1109 is attached by screwing in the -1108, and the position of the holding plate III-1109 can be adjusted by moving it along the strip-shaped hole.

The shape of the holding plate III-1109 is determined according to the height of the workpiece II-2, so that one end of the holding plate III-1109 can contact the upper surface of the workpiece II-2, and the other end can contact the upper surface of the second flat plate III-1111. It is only necessary to meet the requirement that the upper surface can be contacted. When the three dimensions of the workpiece II-2, length, width, and height, change, the second clamp bolt III-1106, the first clamp bolt III-1102, and the holding plate III-1109 realize the adjustability of the device. and satisfies the dimensional change requirements of work II-2.

Further, as shown in FIG. 10, the air floating platform apparatus IV includes a bedplate IV-1, an air floating isolator IV-2, and a support assembly, and the air floating isolator IV-2 is connected to the bed plate IV-1. and the support assembly. In this embodiment, the support assembly includes a plurality of, for example four, support columns IV-3, and the oppositely installed support columns IV-3 are connected via a connection IV-6, and the support columns IV-3 are connected via a connection IV-6. It is used to reinforce the stability and further improve the stability of the bedplate IV-1.

An air floating vibration isolator IV-2 is connected between the top of each support column IV-3 and the bottom of the base plate IV-1, and a housing groove IV-4 is opened at the bottom of the support column IV-3. , an elevating ground pin IV-5 is installed in the receiving groove IV-4, and the height and flatness of the base plate IV-1 are adjusted by the elevating ground pin IV-5.

Preferably, the inner wall of the receiving groove IV-4 is provided with a screw, and the receiving groove IV-4 is threadedly connected to the lifting ground pin IV-5. Further, a load-bearing pad IV-7 used to support the weight of the base plate IV-1 is installed at the bottom of the lifting ground pin IV-5.

Further, as shown in FIG. 11, the base plate IV-1 is a honeycomb base plate, which includes two support plates IV-105 that are parallel to each other and spaced apart, and the base plate IV-1 includes the direction is sealed by a first frame plate IV-102, the outer surface of the first frame plate IV-102 is provided with a leather lining IV-101, the inner surface is provided with a second frame plate IV-103 of damping material; A honeycomb core plate IV-106 is provided inside the second frame plate IV-103, and a magnetically permeable panel IV-104 is provided on the top of the upper support plate IV-105.

In this example, the magnetically permeable panel IV-104 is a high magnetically permeable stainless steel panel, the honeycomb core plate IV-106 is a square aluminum galvanized steel sheet and a reinforced aluminum galvanized steel sheet that are bonded together, and a square aluminum Concave grooves are pressed inside the galvanized steel plate, which has greater strength than the traditional square thin steel plate, which can prevent liquid from penetrating into the honeycomb layer and prevent gas convection in screw hole parts. .

Air floating platform vibration isolation system theory:

Vibration isolation refers to removing or suppressing the direct transmission of vibration by placing an appropriate vibration isolator between the vibration source and the equipment to be vibration-isolated. As shown in Figure 12, each independent degree of freedom of the vibration isolator can be simplified to a single degree of freedom vibration isolation system, where the controlled object is one rigid mass block and the The shaker is a massless element connected in parallel with an ideal damper, and the ground is a rigid body with infinite mass.

であり、式中、ｍは負荷質量であり、ｋはシステム剛性であり、ｃはシステム減衰である。 The vibration differential equation for a single degree of freedom isolation system is:

, where m is the load mass, k is the system stiffness, and c is the system damping.

とすると、

である。

Then,

It is.

とし、式中、

は該システムの地盤振動伝達関数であり、システムが地盤に対して防振システムを介して絶縁されるシステムの物体に伝達される振動の伝達効果を特徴付ける。図１２から分かるように、システムの伝達表現式は同じであれば、

である。

In the formula,

is the ground vibration transfer function of the system, which characterizes the transfer effect of vibrations transferred to the objects of the system from which the system is isolated with respect to the ground via the vibration isolation system. As can be seen from Figure 12, if the system transmission expressions are the same,

It is.

のモード

は地上の単振動干渉下でのシステムの定常状態振幅伝達と呼ばれ、

である。

mode of

is called the steady-state amplitude transfer of the system under simple harmonic interference on the ground,

It is.

は防振システムの減衰比であり、

は地上干渉振動の振動周波数であり、

は防振システムの非減衰固有周波数である。固有周波数とは振動システムの自由振動周波数を指し、固有周波数が低いほどシステムの自由振動周期が長い。以上から分かるように、防振システムの固有周波数を低下させ、システムの減衰比を増加させることは地面に対する大型防振プラットフォームの振動を効果的に向上させることができる。 During the ceremony,

is the damping ratio of the vibration isolation system,

is the vibration frequency of ground interference vibration,

is the undamped natural frequency of the vibration isolation system. Natural frequency refers to the free vibration frequency of a vibrating system; the lower the natural frequency, the longer the free vibration period of the system. As can be seen from the above, reducing the natural frequency of the vibration isolation system and increasing the damping ratio of the system can effectively improve the vibration of the large vibration isolation platform with respect to the ground.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and those skilled in the art can make various modifications and changes to the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this application shall be included within the protection scope of this application.

I Ultrasonic vibration device II Fluid charged spray device III Measuring device IV Air floating platform device I-1 Ultrasonic generator I-2 Ultrasonic electric spindle I-3 Ultrasonic transducer I-4 Horn I-5 Grinding tool I-6 Endoscope II-1 Jig II-2 Work II-3 Ground wire II-4 High voltage DC power supply II-5 Conductor wire II-6 Charged spray nozzle II-7 Connection wire II-8 First hose II-9 Nanoparticles II -10 Ultrasonic vibration rod II-11 Physiological saline II-12 2nd hose II-13 Mixing chamber II-14 3rd hose II-15 Micro-lubrication pump III-1 1st data analyzer III-2 1st information collection Instrument III-3 Amplifier III-4 Second data analyzer III-5 Second information collector III-6 Third information collector III-7 Third data analyzer III-8 High-speed camera III-9 Grinding force measuring instrument III -10 Thermocouple III-1101 Gasket III-1102 1st clamp bolt III-1103 Mounting bolt III-1104 Stopper III-1105 1st flat plate III-1106 2nd clamp bolt III-1107 Base III-1108 Adjustment bolt III-1109 Holder Plate III-1110 Restriction sheet III-1111 2nd flat plate IV-1 Base plate IV-2 Air levitation vibration isolator IV-3 Support column IV-4 Accommodation groove IV-5 Lifting ground pin IV-6 Connection part IV-7 Resistance Load pad IV-101 Leather lining IV-102 First frame plate IV-103 Second frame plate IV-104 Magnetic permeable panel IV-105 Support plate IV-106 Honeycomb core plate

Claims (8)

A bone grinding measurement system,
a three-dimensional displacement workbench on which a jig for clamping bone material is placed;
an ultrasonic vibration device including an ultrasonic generator and an ultrasonic electric spindle connected via a conductive wire, and a grinding tool for grinding bone material is attached to a horn of the ultrasonic electric spindle;
It includes two ultrasonic vibrating rods connected to a charged atomizing nozzle and an ultrasonic generator , a high voltage DC power source is connected between the charged atomizing nozzle and the bone material, and one of the ultrasonic vibrating rods is connected to a physiological Another ultrasonic vibration rod is placed in a container containing saline to apply ultrasonic vibrations to the physiological saline, and another ultrasonic vibration rod is placed in a container containing nanoparticles to apply ultrasonic vibrations to the nanoparticles. Each container is connected to a mixing chamber, and the ultrasonic-vibrated physiological saline and the ultrasonic-vibrated nanoparticles are mixed in the mixing chamber to prepare a nanofluid . A micro-lubrication pump is connected between the micro-lubrication pump and the charged spray nozzle, and the micro-lubrication pump jets out the nanofluid from the charged spray nozzle, and the high-voltage DC power source causes the nanofluid droplets to be charged and sprayed to form charged microdroplets. a swarm-forming fluid-charged spray device;
A measuring device including a grinding force measuring section provided between the jig and the three-dimensional displacement workbench, a micro droplet measuring section and a grinding temperature measuring section provided on the side surface of the jig. Bone grinding measurement system. The grinding force measuring unit includes a grinding force measuring device, an amplifier, an information collector, and a data analyzer connected in sequence;
The bone grinding measurement system according to claim 1, wherein the jig is installed above a three-dimensional displacement workbench using a grinding force measuring device. The jig includes a restriction sheet and a stopper, and a restriction groove for arranging the bone material is provided in the restriction sheet, and one side of the bone material to be pasted and installed in one corner of the restriction groove and an inner wall of the restriction groove are provided. A stopper is installed in between, one surface of the stopper is bonded to the side surface of the bone material, the other surface of the stopper is bonded to the end of the first clamp bolt, and the stopper cooperates with the first clamp bolt. The bone material is restricted in the X direction, the end of the second clamp bolt is bonded to the end surface of the bone material, and the second clamp bolt is attached to the bone material by bringing the other end surface of the bone material into close contact with the side wall of the restriction groove. The bone grinding measurement system according to claim 2, characterized in that: is limited in the Y direction . A flat plate is removably connected to the top of the restriction sheet, a plurality of holding plates whose intervals are adjustable are attached to the flat plate, and the holding plates are used to limit the height direction of the bone material . The bone grinding measurement system according to claim 3. The bone grinding measurement system according to claim 1, wherein the grinding temperature measuring unit includes a thermocouple that can be inserted into the bone material, and the thermocouple is sequentially connected to an information collector and a data analyzer. . The bone according to claim 1, wherein the micro droplet measuring unit includes a video camera for acquiring a grinding image of the bone material, and the video camera is sequentially connected to an information collector and a data analyzer. Grinding measurement system. An air levitation platform device is further provided at the bottom of the three-dimensional displacement work platform, the air levitation platform device including a bed plate, an air levitation vibration isolator and a support assembly, the air levitation vibration isolator comprising a base plate and a support assembly. The bone grinding process measurement system according to claim 1, wherein the bone grinding process measurement system is installed between . The bone grinding measurement system according to claim 1, wherein a magnetically permeable panel is provided on the upper surface of the bed plate, and a honeycomb core plate is provided inside the bed plate.