Talking about the preset of the logarithmic spiral broach

Design the chip pocket 1) Calculate the pitch. The pitch of the rough cutting teeth is calculated according to the following formula, and the standard value is checked. Pr=(1125115)L=9mm transition tooth pitch: Pg=Pr=9mm. Fine cutting teeth, calibration tooth pitch: Pj=Pji=016018mm, Pr=7mm.2) Select the shape and size of the chip pocket. Select the groove shape of the curved tooth back: rough cutting tooth, transition tooth take groove depth h=4mm, cutter tooth thickness g=3mm, small arc r=118mm, large arc R=5mm; fine cutting tooth, calibration tooth take h=215mm , g = 215 mm, r = 113 mm, R = 4 mm. 3) chip condition. According to the formula h1113acKL, the chip size K=217 is taken, the cutting thickness is ac=2af, h=3171mm. It is less than the selected chip pocket depth and is qualified.

The arcuate rough cutting teeth do not participate in the cutting of the minimum pole point (middle G point) after the hole broaching, and the machining allowance at this point is completely cut off by the first rough cutting tooth, the transition tooth, and the finishing tooth. Machining allowance for round rough cutting teeth: The maximum diameter of the hole after broaching, according to the shape of the hole and the logarithmic spiral property and tolerance accuracy, etc. 2Qminh=261021mm. The diameter of the drilling hole before broaching is Qmin=1215mm, so The total machining allowance of the first rough cutting teeth, fine cutting teeth and transition teeth is (Qminh-Qmin) Az12=11021mm.

Other parts design 1) The diameter of the leading part d4 and the length L4 are 25 and 50 mm. 2) The cross-sectional profile of the rear guide is the same as that of the type face, and the size is also the same. The length is taken as L7=(015017)L=25mm.3) Diameter and length d1=22mm; L1=90mm.4) neck diameter and length and transition cone length d2=d1=2115mm, neck length L2=155mm, transition cone length is L3=15mm, handle front to first The length of the cutting teeth Lc1=310mm. Calculate and verify the total length of the broach. The length of the cutting part is L5=mm. The length of the calibration tooth L6=35mm, L=L1+L2+L3+L4+L5+L6+L7+L8= 668mm. Finally take L=670mm and change Lc1 to 312mm.

Conclusion The difference between the precision-cutting teeth of the spiral-type face broach and the machining of the calibrated teeth is the grinding of the front and the cogging of the cutter. For precision and calibrated teeth, the edge is the intersection of the logarithmic spiral cylinder and the round face, which is no longer a flat curve. This design is implemented on the L6140 broaching machine. The multiple loading analysis of the logarithmic spiral surface joint model by ANSYS shows that the stress on the contact surface is relatively average and linear with the torque. The engineering site shows that the transmission accuracy and efficiency of the logarithmic spiral surface-connected electric drum are improved and the service life is prolonged.

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