Spectrum harmonic effectiveness for a given period of time is ground in wind report ball cast-iron applied research

Time:2023-06-15 13:07:20
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source:FANYA CNC Machining

Summary: Generalize the origin that introduced technology of spectrum harmonic effectiveness for a given period of time, analysis its mechanism. Introduced this technology in detail going stress processing effect and retain respect of dimension precision stability, to wind report workpiece of material of nodular cast iron undertook the experiment studies. Through appearance be out of shape to leftover stress and craft after processing determine, show this technology can be replaced heat up effectiveness for a given period of time in order to eliminate stress for the purpose, prevent workpiece to be out of shape, craze, increase stability of work measure precision. Keyword: Stress of magnetism of precision of dimension of much vibration shape of harmonic of leftover stress spectrum detects introductive: Metallic workpiece is in figuration and treatment process, pass natural effectiveness for a given period of time, hot effectiveness for a given period of time or oscillatory effectiveness for a given period of time to eliminate leftover stress commonly. Cycle of natural effectiveness for a given period of time is long, cannot get used to batch production; Specific power consumption of hot effectiveness for a given period of time tall and pollute an environment; Oscillatory effectiveness for a given period of time although efficiency is tall, managing cost 95 ％ , but noise little, stress eliminates big, vibration shape the effect plan of not constant, craft is complex, cause oscillatory effectiveness for a given period of time to was not brought into by most enterprise from beginning to end so formal technological process, can assist a method as hot effectiveness for a given period of time only. After the mankind enters 21 centuries, as the development of electronic IT, the technology of spectrum harmonic effectiveness for a given period of time that is based on fundamental of oscillatory effectiveness for a given period of time appears in China, promotion application received in a lot of industries. The article analyses his above all principle of much vibration shape and microcosmic mechanism, pass applied research and data statistic analysis next, show this technology can be replaced heat up effectiveness for a given period of time in order to eliminate stress for the purpose. One, brief introduction of principle of technology of spectrum harmonic effectiveness for a given period of time this technology is on technology of original and oscillatory effectiveness for a given period of time rise and break through, it is to pass Fu Lixie to analyse, do not need to scan, search inside 100HZ low second harmonic, be in with appropriate energy next many overtone frequency are oscillatory, cause Gao Cixie wave to accumulate oscillatory generation with all possible means to move stress, with multidimensional the leftover stress overlay that distributing, cause plasticity to succumb, reduce stress of peak value remains thereby, make leftover stress distributings at the same time leveling. This technology no matter the harmonic peak that character of discretion of tigidity of workpiece size, frequency, material all can find out 5 kinds of different vibration shape, do not accept restriction of limits of vibrator rotate speed, to stimulating brace up dot and Shi Zhen dot do not have special requirement, can handle inferior the tall rigid Gao Gu that resonance cannot handle has frequency work, can satisfy expensive to dimension precision requirement work, oscillatory noise is low, in mechanical industry enclothe a face to achieve 100 ％ . 2, the research of mechanism of spectrum harmonic effectiveness for a given period of time 1, the generation of leftover stress and elimination methodological metal work are being cast, forging, in solder and using a process, as a result of be heated cold, machinery is out of shape action, the interaction strength that its interior is changed because of relative position between each part and causes, call internal force; The internal force on unit area calls stress. After outside force cancel, the stress of interior of consist in object, call internal stress, and congress of urgent leap of the accumulation of internal stress or local stress produces stress to center, namely leftover stress. Tell from microcosmic angle, distributing and leftover stress is caused. Pass above analysis, to the metal if workpiece brings to bear on mechanical vibration, bring to bear on move stress to be more than metallic stuff attribute to be out of shape succumb the limit, slippage arises between crystal lattice of metallic crystal interior, stress gets flabby, distributing afresh, so OK adjustment stress, make peak value stress is reduced, whole stress leveling, achieve precision of steady work measure, prevent stress to center area crackle budding. 2, the research of mechanism of spectrum harmonic effectiveness for a given period of time 2.

1 macroscopical mechanism studies technology of spectrum harmonic effectiveness for a given period of time has the effective vibration shape of 5 kinds of above, eliminate stress through many dimension vibration, make workpiece interior different place remains stress gets be releasinged adequately, workpiece whole internal stress gets leveling, fight be out of shape ability rises substantially. Leftover stress is shown in metallic workpiece interior multidimensional distributing, if vibration moves the directional overlay of stress direction and leftover stress, leftover stress is eliminated the most sufficient. Express as follows: The influence of flabby to leftover stress per cent expresses direction of vibration of some spare parts oscillatory time (cent) along oscillatory direction flabby to leftover stress percentage (% ) perpendicular to Y level to plane of Y+X+ZY+X of bulk of X transverse Z 1514.

56.

01.

217.

014.

512.

013016.

010.

03.

622.

019.

06022.

019.

012.

027.

024.

025.

018030.

026.

523.

034.

032.

033.

024032.

028.

524.

035.

033.

035.

01 oscillatory parameter: Y to - amplitude =3mm; Frequency =22Hz X to - amplitude =1mm; Frequency =55Hz can sum up from inside the watch at 2 o'clock: (1) , the leftover stress that in perpendicular direction vibration disappear of 15 minutes of place gets rid of, when horizontal way or axial vibration, cost with respect to need 2 times or the vibration of 4 times. (2) , use two-way vibration (planar) or 3 to (bulk) vibration can be more than one-way vibration reduce leftover stress. Nextpage because this, distributing to leftover stress intricate work, should use 3 or the frequency of the different vibration of 3 above condition has ageing treatment. To technology of spectrum harmonic effectiveness for a given period of time, can use more intuitionistic " sand mold law " will analyse its vibration condition. Its method is as follows: In make the same score bead of the Sa Sha on put part, below oscillatory condition, the spare parts is oscillatory the arenaceous bead on each place, arenaceous bead moves, move gradually, center section line (amplitude is the smallest place) around, show section line position and figure. Below frequency of different harmonic vibration, the figure that arenaceous bead shows on spare parts plane and section line position are completely different. Accordingly, technology of spectrum harmonic effectiveness for a given period of time its vibration of 5 kinds of above condition is OK the leftover stress that goes up with much direction undertakes overlay, eliminate workpiece interior adequately of stress of different position remains distributing, make workpiece internal stress gets very good leveling, raise workpiece to fight substantially be out of shape ability. 2.

Effectiveness for a given period of time of vibration of traceable of technology of effectiveness for a given period of time of harmonic of spectrum of research of 2 microcosmic mechanism, its fundamental: Search inside 100HZ low second harmonic, be in with appropriate energy next many overtone frequency are oscillatory, cause Gao Cixie wave to accumulate oscillatory generation with all possible means to move stress, with multidimensional the leftover stress overlay that distributing, cause plasticity to succumb, reduce stress of peak value remains thereby, to the mechanism of oscillatory process, had undertaken much research works domestic and internationally, gain the following consensus. Vibration brings to bear on to metallic component namely periodic active force (move stress σ ) . In oscillatory process, bring to bear on metallic component is departmental of cent move stress σ to move overlay of incomplete of σ of as leftover as interior stress, succumb when what overlay amplitude is more than metallic component ultimate σ ｓ , namely σ is moved + when ｓ of σ of σ incomplete ≥ , these nod crystal lattice slippage, produce tiny plasticity to be out of shape, achieve the goal that releases leftover stress. Look from metallic physics, the process of oscillatory effectiveness for a given period of time, it is metallic stuff interior essentially accumulating of motion of brilliant posture fault, proliferous, a place of strategic importance and intricate process. Because metallic stuff puts fault of v/arc be on the throne, the hands in fluctuant stress and interior leftover stress that arises in component part interior so mutual overlay, in stress higher area, can produce a wrong slippage, appear tiny plasticity is out of shape. Wrong slippage is one-way undertake linear is accumulated, accumulate a macroscopical amount when small meet an emergency, leftover stress is greater inside metallic organization accumulating of a place of strategic importance is able to open a fault of place alternately, local greater leftover stress is able to release, component part is macroscopical internal stress subsequently flabby, make the peak value of leftover stress drops, changed the stress field with original member, make stress reduces the remains of component part to distributing afresh finally, make inferior stress achieves a balance. A wrong mobile suffocate suffocate is caused after bad stuff is accumulated, thereby aggrandizement matrix, raised component part to fight be out of shape ability, make the dimension precision of component part tends stable. 3, the application that technology of spectrum harmonic effectiveness for a given period of time grinds cast-iron spare parts to go up in wind report ball studies 1, research purpose heats up effectiveness for a given period of time and oscillatory effectiveness for a given period of time to two kinds of craft are eliminated in stress and maintain dimension precision stability through be opposite two respects undertake experimental test and verify, affirmatory " spectrum harmonic " oscillatory effectiveness for a given period of time goes stress craft is in wind report nodular cast iron whether can be the domain replaced heat up craft of effectiveness for a given period of time in order to eliminate stress for the purpose. 2, process of treatment of test project content, experiment and detect periodic: The fan FL1500A casing that the specific content of test project decides to be used on the report that it is wind (material is QT400-18) with planet carrier (material machines a process to be surely for QT700-2A); experiment 1.

5 months. After be over from treatment, undertake precision detects the 1st times in succession, place 15 day hind to undertake precision the 2nd times detect. 3, oscillatory effectiveness for a given period of time and hot aging test the interval after finish machining 15 days, detect 2 times circumstance of its size variation. Detect project: The center is apart from; Parallelism; Coaxial is spent; Verticality; Circularity; Cylinder is spent; Flatness detects result statistic analysis: (1) spectrum harmonic effectiveness for a given period of time detected in all 105 projects data, among them data change ≤ 0.

Of 010 have 70, occupy 66.

67% ; ＞ 0.

010 ≤ 0.

Of 030 have 23, occupy 21.

9% ; ＞ 0.

030 ≤ 0.

Of 050 9 are occupied 8.

57% , ; ＞ 0.

05 ≤ 0.

Of 0609 3 are occupied 2.

86% . (2) hot effectiveness for a given period of time detected in all 99 projects data, among them data change ≤ 0.

Of 010 have 65, occupy 66.

66% ; ＞ 0.

010 ≤ 0.

Of 030 have 22, occupy 22.

22% ; ＞ 0.

030 ≤ 0.

Of 050 9 are occupied 9.

09% , ; ＞ 0.

05 ≤ 0.

Of 0648 3 are occupied 3.

03% . From the point of afore-mentioned parallel cases, two kinds of technology are right assure nodular cast iron the effect of the stability of precision of the dimension after finish machining differs dinky, the biggest discrepancy 0.

52% ; The smallest discrepancy 0.

01% ; Because this is OK,consider as identical. 4, nodular cast iron experiments the stress after a hot effectiveness for a given period of time and oscillatory effectiveness for a given period of time eliminates and stress all cloth circumstance detects comparative: Experimental workpiece: Stress of casing of fan FL1500 gear case, planet carrier detects equipment: Russia TSC, 1M, 4 model detector of stress of metallic magnetism memory undertakes stress detects. The fundamental of method of metallic magnetism memory is a metal phenomenon of magnetic field of leakage of the generation in area is centered in leftover stress, and the metabolic report of leakage magnetic field guides magnetism leads tensor, this one tensor is equivalent to a metal be being formed below load action be out of shape or stress tensor. Through this equipment magnetic field of leakage of oscillatory to experimental workpiece around distributings detect, judge distributinging situation of stress of workpiece interior remains, observe stress of around of oscillatory effectiveness for a given period of time is eliminated intuitionisticly thereby with leveling effect. Look from whole, before ageing treatment magnetism stress and gradient value curve distributing not all, local stress centers a phenomenon, stress of the magnetism after ageing treatment distributings reach gradient to be worth peak value to drop apparently. Peak value of value of gradient of stress of 6 3 detected casing, planet carrier magnetism drops on average lowest is 41% , highest for 59% . The leftover stress of the workpiece after proving spectrum harmonic ageing treatment drops, leveling effect is distinct, had stress leveling and elimination favorable effect; Heat up the planet carrier of ageing treatment and casing, the gradient value that the result of gradient value change that gives through detecting and workpiece of oscillatory effectiveness for a given period of time leave in same position undertakes comparative, ratio of its value change is very small can regard the effect as basic and identical. 5, conclusion: According to experimenting to material of nodular cast iron the stress cloth of around of an around of spectrum harmonic effectiveness for a given period of time, hot effectiveness for a given period of time and stress change detect stability of the precision after contrast and finish machining detects comparative, spectrum harmonic effectiveness for a given period of time and the effect that heat up effectiveness for a given period of time agree basically, without clear distinction. Accordingly " spectrum harmonic effectiveness for a given period of time " the technology is in eliminate and stress of leveling workpiece remains is right nodular cast iron the technique that is a kind of effective likewise, can replace heat up craft of effectiveness for a given period of time in order to eliminate stress for the purpose. CNC Milling CNC Machining