Rotary indexing device for machining center tool magazine

Abstract

The invention discloses a rotary indexing device of a processing center tool changer. Originally, the tool changer is provided with a cutter disc, a numerical control unit and a cutter disc counting sensor. Particularly, the tool changer is provided with the rotary indexing device which mechanically and electrically controls operation of the tool changer; the rotary indexing device is provided with a brake clutch disc which is connected to a motor shaft in a guidance way; an electromagnetic coil with the direct current of 90V sleeves the motor shaft; the work voltage of a motor is input into the electromagnetic coil through a transformation and rectification circuit; the electromagnetic coil is controlled to be connected / disconnected by the numerical control unit; a plurality of jacking plates with springs are arranged on the side, facing the brake clutch disc, of the electromagnetic coil; the brake clutch disc is contacted with or departs from a fixed disk in different states of the electromagnetic coil, i.e. an electrified state and an un-electrified state, to allow a motor shaft to rotate or not rotate. According to the rotary indexing device, the traditional defects of rotary indexation of the tool changer are overcome, the failure rate of an automatic tool changing device is greatly reduced, the service life of the tool changer is prolonged, and the production efficiency of a processing center is also greatly improved.

Description

technical field [0001] The invention relates to a tool magazine driving device of a machining center, in particular to an accurate stop device for high-precision rotary indexing of the tool magazine. Background technique [0002] In large machining enterprises, VMC850 has been widely used. The automatic tool change device of the machining center is an important device for the high-efficiency work of the machining center, and the tool magazine is the core component of the tool change device. Under normal circumstances, after the tool change command is executed, the tool magazine will rotate to the corresponding tool position number. The positioning of each tool position in the magazine is completely sensed by the sensor, while the rotation of the traditional tool magazine is completed by the motor with a gear box to drive the cam mechanism. Give the system an instruction to de-energize the motor, and the normal stop position of tool magazine 1 is as follows: figure 1 As sho...

AI Technical Summary

Problems solved by technology

The automatic tool change device of the machining center is an important device for the high-efficiency work of the machining center, and the tool magazine is the core component of the tool change device. Under normal circumstances, after the tool change command is executed, the tool magazine will rotate to the corresponding tool position number. The positioning of each tool position in the magazine is completely sensed by the sensor, while the rotation of the traditional tool magazine is completed by the motor with a gear box to drive the cam mechanism. Give the system an instruction to de-energize the motor, and the normal stop position of tool magazine 1 is as follows: figure 1 As shown, but because the three-phase asynchronous motor needs to rotate a little distance to stop after cutting off the power supply, this will cause deviation of the tool position. If the reduction box and the cam mechanism are used for a long time, the mechanical clearance will increase, which will further Accumulate errors, so that the tool holder 11 is offset as figure 2 As shown, in this way, the tool arm 2 will collide with the tool holder 11 on the tool position when the tool is changed (due to the offset of the tool holder, the center of the tool holder and the center of the spindle 3 are not in a straight line, and they are not completely docked). A knife jam occurs such as image 3 As shown, the tool sleeve or the tool arm may be damaged, and the spindle of the machining center may be damaged, which will affect the machining accuracy and performance of the entire machining center, which is extremely harmful

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