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在通常的资料上,谈到用直线刃车刀加工的蜗杆时,都只讨论下面三种情况: 1)刀刃放在蜗杆轴向平面上(图1a),加工的蜗杆齿面轴向截形为直线,齿面为阿基米德蜗旋面,蜗杆则为阿基米德蜗杆。 2)刀刃放在蜗杆的法截面内,即车刀倾斜角γ等于蜗杆分圆柱螺旋长角λ_0,加工的齿面为法向直廓螺旋面,蜗杆则为法向直廓蜗杆。它又可分为齿槽法向(图1b左边)及齿纹法向(图1b右边)等。 3)刀刃放在基圆柱的切平面内(图1c),用两把车刀分别加工齿面的两侧,齿形角α等于基圆柱螺旋线升角λ_b。加工的齿面为渐开螺旋面,蜗杆为渐开线蜗杆。
In general, when discussing a worm machined with a straight edge turning tool, only the following three cases are discussed: 1) the cutting edge is placed on the axial plane of the worm (Fig. 1a), the axial section of the machined worm gear As a straight line, the tooth surface is Archimedes ’worm surface, and the worm is Archimedes’ worm. 2) The blade is placed in the law section of the worm, that is, the tilting angle γ of the turning tool is equal to the long-axis helical angle λ_0 of the worm. The machined tooth surface is a normal straight helical surface, and the worm is a normal straight-worm. It can be divided into cogging normal (Figure 1b left) and the tooth pattern normal (Figure 1b right) and so on. 3) The cutting edge is placed on the tangent plane of the base cylinder (Fig. 1c). The two sides of the tooth flank are machined respectively by two turning tools. The tooth profile angle α is equal to the rising angle λ_b of the base cylinder helix. Machined tooth surface involute spiral surface, the worm involute worm.