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推刀挤压齿的齿形有各种形式,其中最常见的是一种阶梯式圆柱形棱带的齿形,如图1所示。φD_n和φD_(n+1)为两相邻齿的直径,φD_(n+1)-φD_n=2a_f为齿升量,t为齿距。它的棱带呈圆柱形,并根据齿升量在齿与齿之间呈阶梯状。具有这种齿形的推刀在制造时需要逐级磨削每个齿的棱带外圆。如有一推刀有八个挤压齿,第一挤压齿直径为φ19.980;第八挤压齿直径为φ20.056;齿升量2a_f=0.011;t=5,那么制造时就需要逐级磨削八次。如果将此推刀设计成图2所示形式,将原来阶梯
There are various forms of toothed pinch tooth extrusion, the most common of which is a stepped cylindrical ribbon tooth profile, as shown in Figure 1. φD_n and φD_ (n + 1) are the diameters of two adjacent teeth, φD_ (n + 1) -φD_n = 2a_f is the tooth lift and t is the tooth pitch. Its ribbon has a cylindrical shape and is stepped between the teeth according to the amount of teeth. Knife with this toothed profile needs to be ground step by step for the outer edge of the rib of each tooth during manufacture. If a push knife has eight extrusion teeth, the first extrusion teeth diameter φ19.980; the eighth extrusion teeth diameter φ20.056; tooth lift 2a_f = 0.011; t = 5, then the need to manufacture by Grinding eight times. If you push the knife designed into the form shown in Figure 2, the original ladder