Clamping structure of double-worm gear fly-cutter

Abstract

The invention discloses a clamping structure of a double-worm gear fly-cutter. A center hole concentric with a cutter bar is formed in the driven end of the cutter bar, two parallel mounting holes formounting the fly-cutter are formed in the radial direction of the cutter bar and communicated with the center hole, and the center distance between the mounting holes is the axial pitch of a workingworm; a positioning and clamping mechanism is arranged in the center hole, a force application component, a plurality of balls, a positioning ejector rod, fly-cutters, an elastic ejector rod and the like are sequentially arranged on the end face of the driven end, axial force is generated by the force application component, the end faces of the opposite ends of the positioning ejector rod slide tothe sliced plane of a straight handle of each fly-cutter to form tight surface contact, the two fly-cutters can be fastened in the corresponding mounting holes, and the cutting edge part of a fly-cutter head is positioned at the same part as the working worm. According to the technical scheme, the strength and rigidity of the cutter bar are weakened least, the structure is simple, use is convenient, repeated positioning precision is high, and clamping force is large and reliable; and due to the fact that the clamping parts are arranged in the center hole, conditions are created for achievingmulti-fly-cutter machining of part of the integral multi-head worm gear hob with the handle.

Description

technical field [0001] The invention relates to a clamping structure of double worm gear flying cutters, which is mainly used for hobbing of multi-head worm gears driven by cylindrical worms with small working worm diameter and high 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 the flying knife are simple structure, convenient manufac...

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 structure of vertically staggered holes is suitable for occasions where the diameter of the working worm (knife bar) and the distance between adjacent centers are large, so it limits the use of multiple flying knives. Had to use a single flying knife instead, 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, which 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 break under the action of alternating cutting impact force Bad worm gear, etc.; especially the smaller diameter of the working worm, larger modulus and cutting force, especially the large difference in the cutting conditions of the cutting edges on both sides of the fly knife with a large lead angle, the above clamping structure is not competent

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