COMPUTER NUMERICAL CONTROL MACHINE TOOL FOR GRINDING TWO SIDES OF A PLANE BY SHIFTING SELF-ROTATION AND ULTRASONIC VIBRATION

• US 20130165019A1
• Filed: 09/08/2011
• Published: 06/27/2013
• Est. Priority Date: 09/14/2010
• Status: Active Grant

• Current Assignee: Xi'An University Of Technology
• Original Assignee: University of Technology
• Inventors: Huang, Yumei, Yan, Wen, Gao, Feng, Jiang, Hao
• Granted Patent: US 9,168,625 B2
• Time in Patent Office: Days
• US Class Current: 451/5
• CPC Class Codes: B24B 1/04 subjecting the grinding or polishing tools, the abrading or polishing medium or work to vibration, e.g. grinding with ultrasonic frequency polishing or abrading surfaces on work by means of tumbling apparatus B24B31/00, involving oscillating or vibrating containers B24B31/06; superfinishing surfaces on work, e.g. by means of abrading blocks reciprocating with high frequency, B24B35/00
• CPC Class Codes: B24B 37/08 for double side lapping
• CPC Class Codes: B24B 41/067 radially supporting workpieces
• CPC Class Codes: B24B 7/17 for simultaneously grinding opposite and parallel end faces, e.g. double disc grinders

Abstract

A computer numerical control machine tool for grinding two sides of a plane by shifting self-rotation ultrasonic vibration, wherein a pillar (3) is provided on the tool body (1) of the machine tool, a Y axis movement assembly (12) is provided on the platform of the tool body (1), with a lower revolving movement assembly (11), which revolves about a Z coordinate axis, being mounted on the upper surface of the Y axis movement assembly (12), and a lower grinding plate (10) being mounted coaxially above the lower revolving movement assembly (11); an ultrasonic vibration assembly (2) is mounted fixedly on the pillar (3), with a separation plate (8) for clamping a workpiece assembly (9) being provided on the ultrasonic vibration assembly (2); an X axis movement assembly (4) is mounted on the upper part of the pillar (3), a Z axis movement assembly (5) is mounted on the upright face of the X axis movement assembly (4), with an upper revolving movement assembly (6), which revolves about the Z coordinate axis, being provided on the Z axis movement assembly (5), and an upper grinding plate (7) being mounted coaxially on the revolving axis of the upper revolving movement assembly (6). The present invention enhances the time variation of grinding movement tracks, the uniformity of grinding speed distribution, machining efficiency and machining precision.

Claims

1. A computer numerical control machine tool for grinding two sides of a plane by shifting self-rotation and ultrasonic vibration, being characterized in that a pillar (3) is provided on a tool body (1) of the machine tool, a Y axis movement assembly (12) is provided on a platform of the tool body (1), with a lower revolving movement assembly (11), which revolves about a coordinate axis Z, being mounted on an upper surface of the Y axis movement assembly (12), and a lower grinding plate (10) is mounted coaxially above the lower revolving movement assembly (11);

an ultrasonic vibration assembly (2) is fixedly mounted on the pillar (3), with a separation plate (8) for clamping a workpiece assembly (9) being provided on the ultrasonic vibration assembly (2);

an X axis movement assembly (4) is mounted on the pillar (3), and a Z axis movement assembly (5) is mounted on an upright face of the X axis movement assembly (4), with an upper revolving movement assembly (6), which revolves about the coordinate axis Z, being provided on the Z axis movement assembly (5), and an upper grinding plate (7) being mounted coaxially on the revolving axis of the upper revolving movement assembly (6).

2. The computer numerical control machine tool for grinding two sides of a plane by shifting self-rotation and ultrasonic vibration according to claim 1, being characterized in that each of the X axis movement assembly (4), the Z axis movement assembly (5) and the Y axis movement assembly (12) is provided with a numerical control servo axis, the Z axis movement assembly (5) is controlled by a moment control mode, position precision of the Z axis movement assembly (5) is controlled by a displacement sensor control mode, both of the X axis movement assembly (4) and the Y axis movement assembly (12) are controlled by a position control mode;

and revolving movements of the upper revolving movement assembly (6) and the lower revolving movement assembly (11) revolving around the Z coordinate axis are controlled by using a variable frequency motor driving mode.

3. The computer numerical control machine tool for grinding two sides of a plane by shifting self-rotation and ultrasonic vibration according to claim 1, being characterized in that the ultrasonic vibration assembly (2) is configured such that a rear connecting member (2-1) is fixedly mounted to the pillar (3), an elastic member (2-3) is disposed between the rear connecting member (2-1) and a front connecting member (2-3), the rear connecting member (2-1), the front connecting member (2-3) and elastic member (2-2) are connected through screws;

Guiding pins (2-5) are additionally provided between the rear connecting member (2-1) and the front connecting member (2-3),one end of the guiding pin (2-5) is fixedly connected to the rear connecting member (2-1) and the other end thereof matches with a pin hole in the front connecting member (2-3);

an ultrasonic transducer (2-6) is provided in an inner chamber of the rear connecting member (2-1), the ultrasonic transducer (2-6) is fixedly connected with the amplitude-variable bar (2-4) and the front connecting member (2-3) in sequence; and

the front connecting member (2-3) is fixedly connected with the separation plate (8).

4. The computer numerical control machine tool for grinding two sides of a plane by shifting self-rotation and ultrasonic vibration according to claim 1, wherein a front end of the separation plate (8) is provided with an inner hole, the axis of which is parallel to the coordinate axis Z;

the workpiece assembly (9) is received in the inner hole of the separation plate (8) with both of an upper surface and a lower surface of a workpiece of the workpiece assembly(9) being exposed outside of the separation plate (8);

the workpiece assembly (9) comprises the workpiece and a clamper, the workpiece is clamped in the inner hole of the clamper, the upper and lower surfaces of the workpiece are exposed outside of the clamper, the clamper has an outline of disc shape, and matches with the inner hole of the separation plate (8), and the inner hole of the clamper matches an outline of the workpiece.

5. The computer numerical control machine tool for grinding two sides of a plane by shifting self-rotation and ultrasonic vibration according to claim 1, wherein a plurality of inner holes are provided in the separation plate (8), and each of a plurality of workpieces (9) is received in each of the inner holes.