Method for processing helical surface of toroidal worm by numerically controlled lathe

Abstract

The invention relates to the technical field of turning methods, in particular to a method for processing a helical surface of a toroidal worm by a numerically controlled lathe. The method comprises the following steps of: clamping a to-be-processed worn on the numerically controlled lathe, wherein the plane where the to-be-processed worm is located is S, n and n1 are separately two instantaneous positions, generated when a toothed slot changes as the toroidal worm rotate, of a point on the side surface of a toothed slot in the axial section extending section; moving the tool nose on the corresponding surface of a cut-off tool to the point n, performing bootstrap program for enabling the corresponding tool nose to move to the point n1, carrying out interpolation motion by taking R+m as a cutting radius from the point n1, processing out a circular-arc helical line of one side surface, withdrawing the tool to the initial point n, and cutting a circular-arc helical line of the other side surface in the similar way, thereby completing cutting of the helical surface of the worm. A to-be-processed initial point is determined by performing the bootstrap program, so that the position of the to-be-processed initial point can be accurately determined, dependence on a special numerical-control machine tool is avoided, technical requirements on an operator worker are reduced, manufacturing cost is reduced, the to-be-processed point can be found once, and processing efficiency is greatly improved.

Description

technical field [0001] The invention relates to a turning method, in particular to a method for machining a helical surface of a toroidal worm with a numerically controlled lathe. Background technique [0002] The traditional processing of the helical surface of the toroidal worm is carried out on a special machine tool transformed from a hobbing machine or a lathe, and then ground. This method belongs to the method of processing the tooth shape of the torus worm with a forming knife, but it must be used when processing worms of different specifications. Configure the corresponding cutter head and turning tool. This method has a long processing cycle and high manufacturing cost. Moreover, the adjustment of the machine tool is complicated and cumbersome. The professional requirements for tool sharpening are high, and the technical requirements for workers are high. The existing "Industry and Technology Forum" Volume 10, Issue 24, 2011, Li Song "Using Macro Programs to Realize...

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Problems solved by technology

[0002] The traditional processing of the helical surface of the toroidal worm is carried out on a special machine tool transformed from a hobbing machine or a lathe, and then ground. This method belongs to the method of processing the tooth shape of the torus worm with a forming knife, but it must be used when processing worms of different specifications. Configure the corresponding cutter head and turning tool. This method has a long processing cycle and high manufacturing cost. Moreover, the adjustment of the machine tool is complicated and cumbersome. The professional requirements for tool sharpening are high, and the technical requirements for workers are high. The existing "Industry and Technology Forum" Volume 10, Issue 24, 2011, Li Song "Using Macro Programs to Realize Turning of Toroidal Worm on CNC Lathes" provides a technical method, which belongs to the continuous linear taper thread for simulating tooth profile curves To fit the arc thread to process the method of the tooth profile of the torus worm, when the existing method adopts the CNC lathe to process the tooth profile of the torus worm, the turning worm tooth groove must ensure the synchronous control of the main shaft rotation and the tool movement (C axis X axis Z-axis), in CNC machining, only thread processing can be used to ensure this synchronous relationship. Ordinary CNC systems only support the processing of linear threads, while the tool movement of the toroidal worm is XZ in the case of synchronizing with the spindle rotation. The arc movement in the plane is not provided by the numerical control system. In the process of processing, the existing processing method uses continuous tapered threads to fit the arc threads. In each small section of tapered threads, it is necessary to find the starting point of this section. Starting to process to the end of the spiral section, multiple sub-sections lead to the need to confirm the processing starting point multiple times during processing, resulting in frequent switching of the machine tool system state, and the accumulated error of the processed worm pitch increases, especially in large modules and large guides. It is more obvious during the process, and the crawling phenomenon of the machine tool is serious during the process

In particular, the worm surface processed by this method is an arc thread tooth shape fitted by multi-segment continuous tapered thread lines, not an accurate arc thread tooth surface.

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