Transducer and grinder machine the relation of quality

The main reason cylindrical grinder that affects grinder to machine quality machines a process, because machine material of the appearance of workpiece, dimension, workpiece to pledge and the change of parameter of grinding quantity, grinding, treatment bear changes ceaselessly. Should machine workpiece internal diameter small, grinding feed is little, force of emery wheel grinding is small, treatment negative charge is small. When treatment big internal diameter grows sleeve kind when workpiece, the electromotor that workpiece rotates is in low speed paragraph, emery wheel feed is big, force of emery wheel grinding also is in greaten, treatment negative charge is right now big. Because the change of bear causes electromotor,next moving is spent very hard in constant torsion, constant speed. In the meantime, the change of speed changed the oscillatory frequency such as main shaft, wheelhead and amplitude, face of treatment of the workpiece after treatment appeared the quality problem such as out of tolerance of straight ripple, surface roughness, the quality that cannot satisfy workpiece to machine asks. 2.

The case study that grinder produces vibration in motion is common grinder comprises by 3 oscillatory sources: It is main shaft electric machinery, the whirl that basically is in charge of workpiece; 2 it is wheelhead electric machinery, the high speed that drives grinding emery wheel through belt-conveyor rotates (the stand or fall that contains wheelhead bearing and emery wheel dynamic balancing) ; 3 it is oil pump electric machinery, the around of responsible wheelhead moves and the left and right sides of workpiece moves (some equipment instead of system of oil pump electric machinery alone hydraulic pressure workstation, can cancel this focus) . Any whirl that produce vibration inevitably with mobile equipment, see a picture 1. X axis represents rotate speed, y axis represents oscillatory amplitude. Transducer application communicates the change the frequency of electric machinery power supply and amplitude, change the cycle of its motion magnetic field thereby, achieve the goal of rotate speed of flowing control electromotor. If add wheelhead electric machinery,install the transducer that match, through changing frequency, reduce curve of vibration of wheelhead electric machinery the amplitude of 2, reduce a curve thereby 1, curve the oscillatory amplitude after 2 overlay, reduce the resonance of the generation in grinding process, make sure the precision that processes work asks. 3.

Add outfit transducer inside, the effect company on cylindrical grinder has cylindrical grinder of a M1432A between 2 engine, shouldering process of grinding of motor-car runner shaft. This equipment uses nearly 30 years, ageing of each respect function, treatment precision satisfies craft requirement very hard already, equipment can produce straight ripple when grinding workpiece, personnel of technology of equipment of course career ministry, workshop and equipment maintenance technician undertake study an analysis to this equipment, consider as emery wheel linear velocity and workpiece consistently to rotate linear velocity is interfered each other on frequency, emery wheel produces resonance in machining process of runner shaft, axle sleeve and cause, the solution changes frequency of grinding spindle electric machinery and rotate speed namely, reduce resonance, eliminate the straight ripple of runner shaft thereby. Workshop equipment member, electrician negotiates computation through relapsing, runner shaft is optimal 820 R/min of grinding rotate speed, the rotate speed 3 000 R/min of wheelhead emery wheel, become inverse ratio according to rotate speed and frequency, parameter of technology of electric machinery of wheelhead of affirmatory cylindrical grinder is 1 440 R/min of power 4 KW, rotate speed, frequency 50 Hz and extremely several 4 contrast, think this transducer can apply. Decide the rated power 15 KW of transducer finally, frequency 28.

5~300 Hz, the company is purchased in time, course workshop installation, debug, solved the problem that straight ripple appears in process of runner shaft grinding finally. Draw lessons from outer round grinder to increase transducer, solve the experience of problem of straight moire quality. Career ministry is right the type selecting of wheelhead electric machinery inside the workshop, match appropriate transducer. Parameter is power 5.

50 Hz of 2 900 R/min of 5 KW, rotate speed, frequency, extremely several 2. After installation moves, solved successfully inside the problem of straight moire quality of round grinder. 4.

The last word installs transducer through adding, raised grinder to machine efficiency greatly, by before adding outfit transducer everyday every equipment grinds 8 runner shaft, increase for everyday every equipment can grind 16 runner shaft. Workshop follow-up adds outfit transducer to two grinder again, solved the straight moire problem after runner shaft grinding successfully. Improve through this, not only raised equipment to machine precision, solved the bottleneck working procedure that the workshop produces. In the meantime, managing the sources of energy CNC Milling CNC Machining