Cutter mechanism of machine tool used for turning spherical workpieces

Abstract

The invention discloses a cutter mechanism of a machine tool used for turning spherical workpieces, comprising a cutter (3), a transmission shaft (14) driven by a rotator (12), a cylinder (1) fixed on the machine tool and a piston (2) matched with the cylinder (1); the center of the piston (2) is penetrated with a through hole; the transmission shaft (14) is arranged in the through hole of the piston (2) by a bearing (11); one end of the transmission shaft (14) is fixed on the cutter (3) and is coaxial with the cutter (3); the cylinder (1) is provided with an upper limiting surface (6) which limits a piston part (7) of the piston (2) axially and is a conical surface; and the upper end surface (8) of the piston part (7) of the piston (2) is a conical surface matched with the upper limiting surface (6). The cutter mechanism of the machine tool used for turning spherical workpieces has the characteristics of good rigidity, high precise of repeated positioning, and low processing difficulty, manufacturing cost and operation cost.

Description

Technical field [0001] The invention relates to a mechanical device, in particular to a cutter head mechanism of a machine tool for turning a spherical workpiece. Background technique [0002] The machine tool used for turning spherical workpieces (such as the ball core of a ball valve) includes a tool rack mounted with tools and a cutter head mechanism fixed with the tool rack. The prior art cutter head mechanism includes a cutter head, a transmission shaft driven by a rotator, an oil cylinder, and a piston matched with the oil cylinder. The piston includes a piston part and a piston rod part. The cylinder is fixed on the head of the machine tool, the center of the piston is penetrated with a through hole, the transmission shaft is installed in the through hole of the piston through a bearing, and one end of the transmission shaft is fixed on the cutter head and the two者 coaxial line. The (inner wall) of the oil cylinder is provided with an upper limit surface which axially limi...

AI Technical Summary

Problems solved by technology

[0005] The cutter head mechanism of the machine tool used for turning spherical workpieces in the prior art has the following disadvantages: in order to ensure the rigidity and repeatability of the positioning accuracy of the cutter head mechanism, the cooperation between the piston and the oil cylinder is required to have a fairly high precision, so that the piston and cylinder are increased. The processing difficulty and manufacturing cost of the oil cylinder, and the above-mentioned parts are easy to wear, once worn, the rigidity and repeatability of the positioning accuracy of the cutterhead mechanism cannot be guaranteed, and the replacement of the worn oil cylinder and piston will increase the operating cost of the equipment

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