Double vertical clamping structure of dual-worm-gear fly knives

Abstract

The invention relates to a double vertical clamping structure of dual-worm-gear fly knives. A center hole concentric with a cutter rod is mounted in a passive end of the cutter rod, two parallel connection through holes for mounting and tensioning the fly knives are mounted in the radial direction, and communicate with the center hole, the center distance between the two connection through holes is the axial tooth distance of one work worm, planes are mounted on two ends of the connection through holes, tensioning screws are mounted on the planes on the same side, and connect with screw holesin a fly knife straight handle, a positioning clamping mechanism is mounted in the center hole, a force exertion part, multiple round balls, positioning ejector rods, the fly knives, an elastic ejector rod and the like are sequentially mounted on the end face of the passive end, under the effect of the tensioning screws and the force exertion part, opposite end inclined end faces of the positioning ejector rods slide to a fly knife straight handle slope cutting-flat plane to form tight face contact, the two fly knives are fastened in the corresponding connection through holes, cutting blades of the fly knives are partly located on the portion the same with the work worm, and the positioning and dual vertical clamping technical scheme is suitable for rolling cut of a multi-head worm gear with the large cutting force, modulus and lead angle.

Description

technical field [0001] The invention relates to a double vertical clamping structure of double worm gear flying cutters, which is mainly used for hobbing of multi-headed worm gears driven by cylindrical worms with small working worm diameter, high precision and large cutting force. Background technique [0002] When hobbing and cutting worm gears, because the basic geometric parameters of the worm gear hob must generally be the same as the working worm (that is, the worm meshed with the worm gear to be hobbed), the worm gear hob is a highly targeted special tool with low utilization rate and high price. The production cycle is long and it is not economical to use, and it is difficult to manufacture multi-head worm gear hobs. It is not economical to manufacture worm gear hobs in single-piece small batch production. Toothed worm gear hob, its gear cutting principle is the same as that of tangential worm gear hob. The main advantages and disadvantages of flying knives are simp...

AI Technical Summary

Problems solved by technology

This kind of clamping structure has a large clamping force, and the flying knife is not easy to loosen. However, these two clamping structures are arranged along the radial direction of the knife bar to install the round tie rod and the round hole of the flying knife to cross vertically, which weakens the strength and rigidity of the knife bar. This vertical staggered hole structure is suitable for occasions where the diameter of the working worm (cutter bar) and the center distance between adjacent flying knives are relatively large, so the use of multiple flying knives is limited, and in order to avoid the difficulty of manufacturing and adjusting the flying knives of multiple flying knives , had to be replaced by a single flying knife, reducing productivity

Because the number of flying knives is very small and the cutting volume is large, the cutting edge is easy to wear, and the local wear increases quickly, which increases the cutting resistance, and because the flying knives are tangentially fed, when the flying knives roll from the cutting end to the cutting end At the end, the cutting edge of the flying knife cuts from one side to both sides and then to the other side, and the flying knife generates a large periodic alternating torque along its axis. There is a small gap in the round hole, and it is affected by the rigidity of the tool holder and the supporting end and the gap between the rotating parts such as the bearing. The poor dynamic stiffness will easily cause vibration, and the flying knife will loosen, fall off or even be broken under the action of alternating cutting impact force. Worm gear, etc.; especially the working worm with small diameter, large modulus and cutting force, especially the cutting conditions of the cutting edges on both sides of the flying knife with a large lead angle are quite different, and the above clamping structure is not competent

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