A processing device for multi-line large-pitch helical internal thread of parts

Abstract

The invention relates to a machining device of a multi-line coarse-pitch spiral internal thread of a part, wherein the machining device is high in machining precision. The machining device comprises an indexing mechanism, a locating mechanism, a pressing mechanism and a locking mechanism. An indexing disc is rotationally mounted on a core shaft, and indexing grooves with the number matched with that of lines of the multi-line coarse-pitch spiral internal thread of the part are formed in the periphery of the indexing disc. The right side face of a locating block is perpendicular to the axis of a connecting piece. The axial center position and height of a V-shaped groove of a V-shaped block are consistent with the center position and height of the connecting piece. The upper end of a ball head rod is rotationally connected with a press plate. The upper end of a cylinder screw stretches out of the upper portion of a rectangular groove in the front side of the press plate, a pressing nut is assembled at the upper end of the cylinder screw, and the lower end of the cylinder screw is rotationally connected with a fork seat. A locking core shaft is assembled in a locking outer sleeve, an indexing locking part at the lower end of the locking core shaft is correspondingly matched with one indexing groove in the periphery of the indexing disc, a pressure spring is mounted between the locking outer sleeve and the locking core shaft, the upper end of the pressure spring is in elastic compression contact with the bottom face of an upper hole of the locking outer sleeve, and the lower end of the pressure spring is connected with the lower end of the locking core shaft.

Description

technical field [0001] The invention belongs to a thread processing device, in particular to a processing device for a multi-line large-pitch helical internal thread of a part. Background technique [0002] In some special machinery, there is a part with multi-line large-pitch helical internal thread on it. The characteristics of this kind of parts are: it can be 5 wires or 6 wires, there are 5 or 6 pitches in one lead, the pitch is 5mm or 6mm, and the tooth profile of the thread is trapezoidal, zigzag or triangular circular tube shape, The lead is 200mm or 300mm, and the screw direction is left-handed or right-handed. Usually, the multi-line large-pitch helical internal thread of this kind of part is processed on an ordinary lathe, and the device used includes a thread turning tool and a universal three-jaw fixture. The processing method is usually an axial split method, including the following steps; Position it with the outer circle, install and clamp it on the three ja...

AI Technical Summary

Problems solved by technology

Since the scale of the small pallet of ordinary lathes is 0.05mm per division, the calculated number of rotations usually has decimals, so the division cannot be done accurately, resulting in a large division error

At the same time, the transmission error of the guide rail and the screw rod of the small carriage is large, which leads to insufficient stability of the machining accuracy of the parts

This requires processing personnel with high skill level and rich experience, otherwise the processing efficiency and processing accuracy will be low

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