Flat bottom oscillating follower dish the method of a kind of design of form cam

471 preface are current, the contrail of cutting tool center when the methodological computation that tries equidistant curve according to protruding contour line all is being used to machine cam in all sorts of materials that design about cam. Press this method, want to calculate contrail of cutting tool center must be calculated first the outline line coordinate that gives cam, and computational process and computational formula are quite complex. In view of this, the article is aimed at flat bottom oscillating follower dish form cam mechanism established a group of formula, with this group of formula but not via computational protruding contour line direct calculation gives contrail of cutting tool center, also can calculate directly the working outline line of cam. The derivation graph of 2 formula is shown 1 times to slant buy makes the same score bottom oscillating follower dish form cam mechanism a position in movement. The E in the graph arrives to average a copy driven the distance of O1 of centre of turning circle, a is the length that the center is apart from, rb is basic circle radius, m is driven the osculatory dot of flat bottom and cam. From the actuating travel on cam paragraph of position of rest it is to diameter extremely the axis builds polar coordinates is, criterion the polar coordinates that θ , ρ nods for the M on protruding contour line. By the graph 1 in geometrical relation is visible, driven the: when be in initiative position? ?1) pursues oscillating follower of 1 flat bottom dish form cam mechanism asks according to the job driven of make choice of after motion curve, the driven that can you derive with cam corner δ is ginseng variable is angular displacement equation mixed: of kind of angular velocity equation? Basis of?2) 　 the property of 3 hearts theorem and heart of twinkling of tall deputy orgnaization is knowable, the N-n of public law line that passes M point and nodical P is cam and driven namely speed twinkling heart. By the definition of twinkling heart knowable, in P the dot is in cam and move speed is equal, namely: Solve 　 (3) criterion 　 (the 　 in 4) clear picture (° of =90 of 5) λ + 0+ 　 　 (6) is in △ OMP, use cosine theorem to get: (　 of 7) 　 (δ of = of 8) criterion θ + 0- 　 　 (9) 　 is apparent, if the graph is shown 1 times, the milling cutter center that chooses correspondence with M when machining cam is located in necessarily on N-n of public law line. Set cutting tool radius to be Rd, if take 　 (10) criterion the distance that this nods to P for cutting tool center, its era is entered (7) , (8) , (9) type begs the θ that go out, ρ is coordinate of protruding contour line no longer, however the coordinate of cutting tool center. Ought to point out, classics analysis is knowable, should mix by D/d δ only, acting numerical value has consideration, criterion afore-mentioned various also apply to return trip Duan Hexiu to stop paragraph. In 3 protruding contour line and design of computation of contrail of cutting tool center, after giving basic measure A and Rb certainly, can occupy (1) , (2) , (3) , (4) , (10) , (6) , (7) , (8) , (9) various by the graph 2 show contrail of center of cutting tool of computation of flow process designing or computational protruding contour line. Those who need a specification is: Graph 2 computation flow chart 　 (1) the radius assignment of milling cutter of computational lieutenant general gives Rd, can beg D giving a knife to provide central contrail coordinate directly. (2) tax 0 values to Rd, beg the θ that go out, ρ to be coordinate of line of cam job outline. (3) like driven slant to what graph 1(b) shows place situation, criterion E needs to input negative worth. (4) if be oscillating follower of flat to the heart bottom, need to take E=0 to calculate only can. In the light of specific calculate exemple, the author runs computation on personal computer by afore-mentioned different situations, obtained satisfactory result. Article place narrates 4 epilogue the method will make the same score bottom oscillating follower dish the outline line equation of form cam and be in harmony of equation of contrail of cutting tool center are an organic whole, calculate alone conveniently according to need contrail of cutting tool center or coordinate of protruding contour line. In computation, need a change to slant only the form of flat bottom oscillating follower that is apart from the assignment of E to be able to apply to 3 kinds to differ. And place lists process of derivation of equation palpability understands easily, geometrical relation is clear, formulary the form is simple, easily process designing computation. Design for project technology personnel, made this kind of cam provide the new method with a kind of feasible forthright. CNC Milling