Small hole vibration gets the experiment that cuts force to consider

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Summary: The structural design that introduced the tiny Kong Zuan of tall sensitivity to cut the appearance that measure power and small small Kong Zuan cut force to measure working principle of the system. Return to an experiment through yuan of many orthogonal polynomial, got small hole vibration is gotten cut force about oscillatory frequency, amplitude and feed nonlinear recursive equation, analysed oscillatory parameter and cutting parameter to cut the influence of force to getting then, cut mechanism to offer necessary experimental step and valuable research technique to study small hole vibration is gotten deep. 1 foreword is in modern manufacturing industry, the amount that tiny Kong Jia is versed in increasingly grow in quantity, the demand that machines quality to its is higher and higher also. Accordingly, treatment of the efficient, high quality of small hole, low cost already made modern production technology in a very important research task. Vibration getting cuts theory of vibration of new technology be in harmony and cutting theory at an organic whole, the spatio-temporal relation between the cutting tool in changing tradition getting to cut and workpiece and auger cut mechanism, its favorable craft result already caused domestic and international widespread attention. But the theory that cuts about vibration getting and experimental research work still are in start level, the academic problem that still exists to need to discuss in great quantities and the practical technology that develop urgently. Vibration getting cuts a process to get the main factor that cutting force is life of immediate impact broach and bore quality mediumly. Because vibration gets what when cutting small hole, arise,cut force very small and measure not easily, go up in certain level consequently block up get the research that cuts mechanism to small hole vibration. For this, we develop the tiny Kong Zuan that developed tall sensitivity, high accuracy to cut force to survey a system. Had get measure of the test that cut force, can get cut mechanical character to undertake theory and experiment study to small hole vibration, the vibration that discusses small hole deep is gotten cut mechanism, promote small hole vibration to get the further progress that cuts craft. Because the geometrical form of broach is more complex, the mechanical model that so compose builds vibration getting to cut particularly complex. Heretofore, according to cutting mechanical compose builds vibration to get the research that cuts mechanical model field to still do not see more, and a few research were made to theoretical model as a result simplify too much, very difficult as exact as experimental result tally. Getting actually in cutting treatment, normally use experience formula comes to computational getting cut force. Because vibration gets the effect that cuts force to suffer oscillatory frequency, amplitude, feed to wait,exist interact, reason builds the traditional method of formula of cutting strength experience not to apply to vibration getting to cut. For this, the article is used multivariate experiment of orthogonal polynomial regression will build auger cut force about frequency, amplitude, feed nonlinear recursive equation. 2 small alveolus get what the structure that cuts the appearance that measure power designs a model cut structure of the appearance that measure power to basically have Baobi cylinder type and truss vertical are out of shape muscle type. The appearance of the appearance that measure power of construction of type of thin wall cylinder is taller, the ability that fights prejudicial load and side force is poorer, more sensitive to position of strength effect spot. Truss vertical is out of shape muscle type construction is used at big, medium of span it is better to get the performance when cutting the appearance that measure power, but its sensitivity is not easy when be being used at measuring tiny Kong Zuan to cut force achieve a requirement. Spoke type elastomer can be used at measuring axial force and torque at the same time, have admirable natural degree of linearity, the displacement when getting power is lesser, not sensitive to position of strength effect spot, instrument appearance is inferior, can bear larger side force, and the structure is simple, installation is convenient, use generally in the high accuracy sensor of medium span. When be used at grain Cheng sensor, because elastomer geometry dimension is lesser, machine and assemble all more difficult. Get on brass material workpiece cut Ø0.

When 5mm aperture, the axial force of generation is 6N about, torque is less than 1N · Mm. Measure so small force, the appearance that measure power must have extremely tall sensitivity. If use spoke type elastomer, elastomer ply must very small (about 0.

3mm) ; If use integral type structure, sex of its treatment craft is very poor, achieve the precision of the requirement hard. To solve this one problem, we used high strenth structure gooey received assembly type construction, be about to elastomer cent is 4 sole stretch chip to be machined respectively, structure of reoccupy high strenth is gooey receive for an organic whole (place of this the appearance that measure power gets load not quite, stick receive place intensity to be able to satisfy requirement) . Such, elastomer is machined more easily, and can assure what to need precision, resolved the contradiction between sensitivity of the appearance that measure power and structure and processability thereby. Type getting cuts the spoke of development the appearance that measure power can achieve very tall sensitivity, have better processability, its structure is shown 1 times like the graph. Graph 1 spoke type is gotten when cutting diagram of structure of the appearance that measure power to measure power instrument to suffer torque effect, in the elastomer neutral line that sticks a position generation curves stress, and size of value of two side meet an emergency is equal, way is opposite. Reason should the edge is stretch a neuter axis direction is stickup meet an emergency piece, every flexibility piece two side stick each, in all 8 meet an emergency piece comprise complete bridge circuit. Below axial strength effect, stretch a two side generation is identical curve stress, 8 meet an emergency of road of reason torque bridge piece generation size the strain with equal, same way, add through bridge decrease character to be able to offset completely. Axial force can pass stickup on 45 ° or 135 ° direction meet an emergency piece measure cut meet an emergency and get. As a result of flexibility piece dimension is lesser, reason takes an edge 45 ° and 135 ° direction stick a meet an emergency each piece the method comprises complete bridge circuit. Change the appearance that measure power and succeed enlarge circuit, A/D interface join to rise, collect data by the computer, on the appearance that measure power to load can undertake demarcate to the whole system that measure power, measures main function index is as follows: ① sensitivity: Sensitivity of output of region of axial force bridge is 4.

57µe/N, sensitivity of output of torque bridge region is 12.

423µe/N. ② natural frequency: Natural frequency of axial force direction is 800Hz, torque direction natural frequency is 285.

7Hz. ③ is nonlinear: Of road of axial force bridge nonlinear the error is more than 0.

65% , of torque bridge road nonlinear the error is more than 0.

9% . 3 tiny Kong Zuan cuts force to measure systematic work principle to use the computer to collect the real time that reachs processing to check data to be able to realize experimental data is collected automatically and handle, can discover erroneous data in time and fill do a test, place of data of economic processing test needs time, can use a variety of data processing methods, the result that makes more accord with actual. For this, we developed A/D to change interface and data to collect, processing software, the tiny Kong Zuan that if the graph is shown 2 times,cuts composition of the appearance that measure power with tiny Kong Zuan cuts force to survey a system. Graph 2 small hole are gotten in cutting force to measure systematic block diagram to survey a system in this, workpiece outfit is placed on the appearance that measure power, auger cut in personal computer control small hole changes parameter vibration is gotten cut a system aspirant travel. The appearance that measure power generates two output signal, represent axial force and torque respectively, after outputting wave of enlarge of appearance of dynamic meet an emergency of signal classics YD-15, filter, inside the range of 0 ～ 5V that changes interface place to need to A/D via magnifying circuit alternates voltage again, in inputting the computer to signal sampling by ADC0809, show by computer software again get the weaveform that cut force, memory primitive data and processing result, undertake digital signal processing and analysis to primitive data. In the meantime, can undertake disturbing to primitive signal according to demarcate result corrective, remove the two mutual interference between Xiang Lizhi, computation gets each diagnostic parameter in the process that cut force. Finally, can undertake according to need multivariate orthogonal polynomial returns to processing, get force follows the recursive equation that experimental element changes getting cutting. Undertake with this system tiny Kong Zuan cuts force the test is very convenient, whole measure reach data processing process to all control next undertaking in the computer, assured to measure the accuracy that reachs data processing, can improve test efficiency greatly. Vibration of 4 small alveolus is gotten cut force multivariate vibration of experiment of orthogonal polynomial regression is gotten when cutting, existence has opposite vibration of the rule between broach and workpiece, auger before cutting parameter to be like cutting ply, cutting tool, hind speed of horn, cutting mix as A of oscillatory frequency F, amplitude of feed F change and change, and interact exists between F, A, F. Same, auger cut force to also be existed by the influence of F of A of oscillatory frequency F, amplitude, feed interact. Cut the relation between force and F, A, F to inspect its interact to consider to get, we are used multivariate recursive experiment built orthogonal polynomial to get cut force the recursive equation about F, A, F. Auger cut in cutting a course, force is being gotten is constant change, getting cut different section, get the metabolic trend that cuts force to differ. The change that cuts force to consider to get in the round and do not increase too much parameter, we undertook simplifying to getting the weaveform that cut force, will get, get, get in 3 section in getting cut force brief melt into is linear. Get the feature that cut force for comprehensive report, affirmatory experiment index is as follows: 3 section get the slope of the change that cut force to be K1, K2, K3 respectively, the dividing line dot of 3 section is (T1, y1) and (T2, y2) , the average force of the section in getting is Y0, get a hour to be T3. The unit of each parameter is respectively: Unit of K1, K2, K3 is 10N/s or 10N · Mm/s(parts corresponding axial force or torque) ; Unit of T1, T2, T3 is 0.

1s; Unit of Y1, Y2, Y0 is N or N · Mm(parts corresponding axial force or torque) . Express 1 element level to express experiment of horizontal F(Z1)(Hz)A(Z2)(µm)f(Z3)(mm/ Min)1300460240068035008100 to control small hole to change in new-style personal computer undertake on parameter vibration drilling machine. Be opposite in the experiment element F(Z1) , A(Z2) , F (Z3) all takes 3 levels, rank of its element level is expressed 1. Broach diameter is 0.

5mm; Workpiece material is brass, ply 1.

5mm. Because length place is restricted, give out only here measures one group getting cuts force weaveform, if pursue,3 are shown. (F=400Hz, a=4µm, f=80mm/min) pursues 3 get the weaveform that cut force to use multivariate orthogonal polynomial regression is gotten auger cut force the each parameter regression about F, A, F equation, use these to return to equation to be able to analyse oscillatory frequency, amplitude, feed to cut force to getting the influence of each parameter. Return according to returning to equation but draw gives each parameter the three-dimensional curved surface about F, A, F, can make an on-the-spot investigation more intuitionisticly thereby get the metabolic law that cuts force, give out only here auger cut force the average Y0 of the section in be being gotten the three-dimensional curved surface about F, A, F, if pursue 4, the graph is shown 5 times. Can divide the metabolic rule of separate out Y0 by the graph: The effect that the Y0 of axial force suffers F and F is bigger, f increases, y0 increases subsequently; F increases, y0 is reduced subsequently; 2 when the Y0 of torque basically suffers A and A, the impact of F is bigger, y0 ～ A has great value, great value drop is A=5µm; F increases, y0 increases subsequently. (F=400Hz) graph 4 Y0 the three-dimensional curved surface about A, F (the tiny Kong Zuan that about the three-dimensional curved surface of F, F the article develops 5 epilogue cuts A=6µm) graph 5 Y0 force measures a system to have very tall sensitivity, because use the computer to collect, process data, went to the lavatory greatly greatly the measurement that small small Kong Zuan cuts force, cut mechanism to provide necessary experimental measure to study small hole vibration is gotten deep. Tiny Kong Zuan cut the appearance that measure power to use high strenth structure adhesive to stick those who receive assemble type construction, resolved the contradiction between sensitivity of the appearance that measure power and structure and processability. This also is had to the design of grain Cheng sensor draw lessons from action certainly. Vibration getting cuts the small Xiaokong that the article undertakes force is multivariate more comprehensive ground inspected experiment of orthogonal polynomial regression to get cut the relationship between force and oscillatory frequency, amplitude, feed, for small hole vibration getting cuts medium parameter to chose to provide referenced basis, also got cut further thorough research to lay a foundation for small hole vibration. CNC Milling