Nov 23 2016nbsp018332Abstract Thermal deformation of large computer numerical control CNC gear profile grinding machine tools which causes the position changes of grinding point between a grinding wheel and workpiece in X and Y directions affects the machining accuracy significantly.
This invention relates to a method for the generation of a single or multi start grinding worm for grinding tooth profiles in accordance with the principle of continuous diagonal generation grinding and an apparatus for implementing this method by which across a portion of the worm width the flanks of the worm thread are given modifications and the ratio between the modified and the non modified grinding worm zone yields an optimum with respect to a favorable exploitation of the overall worm width.
The majority of cylindrical gears used in gear drive technology today have involute tooth profiles However for load reasons the meshing of two involute gears often fails to produce an optimal operating behavior so the tooth flanks are provided with modifications deviating from the involute in both the profile and longitudinal directions by means of design calculations As the magnitude of such modifications for the most part falls within the micrometric range grinding processes play an essential role in the manufacture of modified tooth flanks.
In contrast the application of more complicated tooth flank modifications requires varying specifications in a number of transverse sections and on a number of cylinders In extreme cases each point on the flank of the tooth can be allotted its own modification magnitude deviation of the profile from the involute The manufacture of such gearing by means of continuous generation grinding requires special technological procedures.
The solution to this task is based on the two known fundamental methods for profiling grinding worms viz profile dressing and line by line dressing as well as on the diagonal generation grinding of gears.
Grinding in hot condition is developed by using the mathematical model of the thermal expansion which allows one to predict changes of the profile of S shaped rolls The algorithm and the results of its manufacturing approbation are pre sented in this paper Keywords hot rolling working rolls grinding thermal profile Received 19 February 2015.
FIG 1a shows the principle of profile dressing of grinding worms.
FIG 1b shows the principle of line by line profiling of grinding worms.
FIG 2a shows contact conditions during continuous generation grinding.
The interacting motion between grinding wheel and the workpiece meanwhile profile grinding wheels are manufactured to match the geometry of the desired gear directly 2 Figure 1 Overview of classes and subclasses in grinding 2 The most used fine finishing method whe n it comes to cylindrical gears is generating gear grinding 10.
The hobbing or grinding machine the tool can run wobbly or eccentrical ly which is described on the reference collar by radial and axial run out devia tions The tool can have a sinus shaped thread lead deviation if the hob or grind ing worm does not run to the reference collars and a linear thread lead deviation.
A process for the discontinuous profile grinding or milling of gear wheels with wheel type or shank type tools which includes setting approximate parameters for the workpiece to be worked by the tool so as to avoid large profile deviations determining by calculation or trial the profile of the workpiece following work thereon comparing the work profile with the predetermined profile of the.
Longitudinal profile If you are having taper problems here are the best things to try first one at a time then So the surface of the wheel is never entirely parallel to the surface it is grinding This slight deviation from parallel may cause unacceptable taper in the bore where the quillwheel is.
Along a profile grinding contact line occurs different material removals because of the different form of the involute at the points j and k In this way a negative deviation of the profile angle arises in the transverse section plane in which the points j and k lie.
Jul 19 2015nbsp018332Profile grinding is an established technology for manufacturing aircraft engine components with a high surface quality and a high dimensional accuracy for instance the dovetails of gas turbine blades In spite of recent advantages the employment of profile grinding has been impeded by drastic wheel wear and thermal damage especially when machining difficult to cut materials such.
As a result the previous surface prediction models that have been extensively studied for surface grinding are not able to reveal the surface generation mechanism of gear profile grinding In this work a comprehensive model is presented to calculate the surface topography and the chip geometry considering the non uniformity of geometric contact and grain workpiece interaction along the tooth.
Jul 01 2020nbsp018332During the grinding process with roughing parameters spindle power P s and clogging degree Z s of the grinding wheel surface were determined The evaluation of the gear quality was carried out by measuring the total flank F and total profile deviation F as well as the concentricity F r the pitch F p and the span deviation W k It was shown that higher feed mark depths lead to an.
According to the graphs the accuracy on both the right and left flanks is grade 4 or higher whereby the deviation of profile is 7 2 m the deviation of helix is 6 1 m and the deviation of cumulative pitch is 18 6 m.
Thread grinding wheel using the rotary dresser and perform diagonal grinding while sequentially shifting the portion of the grinding wheel that grinds the workpiece Figure 2 shows the transition of the tooth profile pressure angle when the grinding wheel ground 40 workpieces between dressing cycles According to the graph the variation on.
Abstract The localized wear on grinding wheel edges is a common phenomenon on profile grinding since the abrasive grains are less attached to the bond The grinding wheel wear depends heavily on the process parameters workpiece and wheel composition causing changes on the process and profile deviation behaviors.
Profile grinding Search Results Articles About profile grinding Articles are sorted by RELEVANCE Sort by Date 1 Profile Grinding Gears From The Solid Is It Practical MayJune 1997 It isnt for everyone but Within the installed base of modern CNC gear profile grinding machines approximately 542 machines worldwide grinding from the solid isnt frequent but a growing number of.
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Set the equation of theoretical involute of the right tooth profile is When the position deviation of grinding wheel is the actual tooth profile after manufacture is From any point of the actual tooth profile tangent for the rolling circle as the tangent point the angle between the straight line and the axis is The angle between the.
Grinding spindle drive power kW 35 28 5 Max grindable module hob grinding mm 6 5 Max grindable module profile grinding mm 12 10 Galvanically coated CBN tools yes yes Dimensions of worm grinding wheel DxLxW mm 275320 x 160 x 160 220240 x 200 x.
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Jan 01 2008nbsp018332Profile and shape grinding of high alloyed steels Profile and shape grinding of high alloyed steels Biermann D Weinert K Jansen T Noyen M 2008 01 01 000000 High alloyed steels are used in areas where special material properties are demanded Providing a high strength and a high wear resistance these steels main application area is forming technology e g for dies or plungers.
In order to fulfill these demands profile and lead modifications are being applied more often than in the past This paper will focus on how to produce profile and lead modifications by using the two most common grinding processesthreaded wheel and profile grinding.
With sufficient accuracy the desired profile of the roll on roll grinding machine in the absence of data on initial pre cooled and final after cooling thermal profile of a deviation the.
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