Study On Sharpening Device Of Scraping Carbide Hob With Convex Curved Face

1.IntroductionWith the continuous development of science and technology, the gear cutting tool and the method are also developing, specially scrapes the craft along with the hard alloy the unceasing development, along the scraping carbide hob with convex curved face appearance and the application, caused the gear cutting precision and the processing efficiency obtained the very big promotion. Simultaneously also set the new request to the new hob's sharpening equipment. Especially in small factories in general can not afford to purchase special hob sharpener or is uneconomical, hob grinding required delivery, so that both the delay in working hours and wasted money. Therefore, the development of a simple, economic hob grinding device which fit small and medium-sized Factory applications, so that enable it to be possible to facilitate carries on the raised tune before the plain grinding machine scraping carbide hob with convex curved face to have certain actual value and the significance.2. Sharpening PrincipleBecause this research is aiming at convex curved face scraping hob, while the hob used convex curved involute surface as rake face. Therefore we will according to Involute forming principle and generating machining principle to grinding this kind of hob. The involute rake face's basic sharpening principle uses a counter gear meshes mutually when the conjugate profile for the envelope curve principle to each other to grinding hob . When grinding tooth, one round is the grinding wheel, represents an imaginary rack's tooth, its position is fixed motionless, but itself axial makes the grinding movement along the hob.Another round is the hob, for a produce by rubbing correct involute tooth profile, the involute hob's grinding pitch circle should circle the imaginary rack's fixed pitch line pure rolling , namely the hob both must have rotation of its own axis and its axis must have along the pitch line direction translation. Moreover these two movements still maintained the fixed angle transmission ratio. Such the major flank of grinding hob is the grinding wheel in each position envelope curve and involute.3. Sharpening Device design and 3 d model constructionBy the fore-mentioned sharpening theory we may know that hob's sharpening movement is the result which several kind of movement syntheses realize. According to the movement transmission route and mode of motion's difference, we design the device by dividing into the translation part and the rotary motion part. The translation is mainly the servo motor drive the guide screw axis rotation, the guide screw fixes through the bearing on the pedestal and driving the slide plate which connected the axle sleeve to parallel translation along the guideway of pedestal. The rotary motion is achieved by steel strip and rolling disc structure which transform bearing seat translational motion as mainshaft's rotation, thus realizes hob's revolving. Besides hob's indexing is realizes by the index plate and the dividing handle through the manual. Then the components 3d design modeling and the virtual assembly have been carried on using the CATIA powerful modelling function. Also inspects whether the interference between various parts, virtual prototype was established finally. 4. dynamic simulation analysisThe virtual prototype technology may simulate the product whole really movement and the stress situation in each kind of virtual environment. It also can express analyse many kinds of design scheme and carry on the experiment which on the physical prototype in terms of difficult or impossible, until obtains system's optimum design scheme. In this paper, the dynamic characteristic of scraping carbide hob with convex curved face sharpening device have been studied using mechanical system dynamics simulation analysis software ADAMS. The mechanical system components model of sharpening device being import and reassemble then adding constraint and driving in ADAMS/View. The end completion the work process simulation of sharpening device, and according to simulation result tracing analysis installment movement and dynamic performance. Finally we have verified the entire installment state of motion through the visualization movement simulation.5. the components statics analysis by the finite element methodThis paper in had understood the finite element method and in the finite element software's foundation, to the sharpening device components basis structure's actual situation, has analyzed the force, according to the design establishment's solid model, has chosen the appropriate element type, has defined the material properties, has carried on the reasonable mesh generation,has established the finite element model, carries on the computation using the ANSYS software to obtain the displacement and the stress nephogram carries on the statical analysis,has obtained the main axle and the several other components maximum equivalent stress and maximum structure total deformation, has demonstrated the part's stress distribution and the distortion distribution intuitively. We can see the vibration situation through the bearing block modal analysis under the working state. Its vibrational frequency and the amplitude can satisfy machining quality requests. The analysis result indicated that these components' strength may satisfy the machining request which under the dangerous operating condition, its rigidity can guarantee that the sharpening device obtains the enough precision.6. conclusionThis paper give the sharpening device direct-viewing structure through CATIA to carry on the 3d modelling based on the virtual prototype technology. And it can intuitive understanding of the overall device design and the whole idea, but also through interference with a preliminary analysis, we can verify the correctness of the design; Simulation of the sharpening device work process has been carried out through ADAMS then according to simulation result tracing analysis installment movement and dynamic performance. Finally the paper has analyzed its state of motion through the visualization movement simulation. Through carries on the statical analysis using the ANSYS finite element analysis software to the installment main spare part's displacement and the stress nephogram computation, and the bearing block has carried on the modal analysis. Has realized virtual prototype modelling finally.