CN201186388Y - Machine tool micro-actuating jig for precision machining - Google Patents

Abstract

The utility model relates to a micro-implementing fixture of machine tool used for the precision finishing, which belongs to the precision finishing field and aims at solving the heat error due to the hot deformation of a machine tool during the precision finishing. The fixture is characterized in that a dovetail slide bearing on a Y direction movable block is matched with a dovetail groove of a base (1), the Y direction movable block (6) moves along the Y direction under the driving of a piezoelectric ceramic block A (17), a dovetail slide bearing of a X direction movable block is matched with a dovetail groove of Y direction movable block (6), and the X direction movable block (6) moves along the X direction under the driving of a piezoelectric ceramic block B (5), a dovetail slide bearing of a Z direction movable block (8) is matched with a dovetail groove of a guide pad (9), the Z direction movable block (6) moves along the Z direction under the driving of a piezoelectric ceramic block C (11). The utility model provides a machine tool fixture for the precision finishing, which has simple structure and is easy to be realized.

Description

A machine tool micro-actuated fixture for precision machining

Technical field:

The utility model relates to a machine tool micro-executing fixture used for precision machining, more specifically, the utility model relates to a fixture micro-driver used in precision machining to perform real-time thermal error compensation to drive the fixture to generate compensation displacement.

Background technique:

Most of the existing thermal error compensation technologies use the displacement compensation method of temperature monitoring. The temperature and displacement signals to be detected are converted into micro-electricity signals through temperature sensors and displacement sensors, and then converted into A/D cards through their respective transmission devices. The required input power signal. The A/D conversion card converts the analog quantity (voltage or current) into a digital signal acceptable to the computer and then inputs it to the host computer for processing. Then the host computer inputs signals to the servo feed system through the control bus of the CNC machine tool, and the servo feed system automatically performs real-time error compensation according to the provided control signals and compensation data. This compensation method is constrained by the non-negligible errors produced by the numerical control system and the servo feed system itself.

Utility model content

In order to solve the above problems and overcome the shortcomings of the existing thermal error real-time compensation technology, the utility model proposes a micro-execution fixture for machine tools for precision machining.

The utility model is characterized in that it includes from bottom to top: a base 1, which has a dovetail groove, at least one pair of piezoelectric ceramic blocks A17, at least one pair of fixing devices A16 for fixing and driving the piezoelectric ceramic blocks A17 moving in the Y direction and Adjusting screw A20;

Y-direction moving block 6, the Y-direction moving block has a dovetail guide rail, a dovetail groove, at least one pair of piezoelectric ceramic blocks B5, at least one pair of fixing devices B4 and adjustment screws for fixing and driving the X-direction moving piezoelectric ceramic block B5 B19, and the dovetail guide rail on the Y-direction moving block 6 matches the dovetail groove of the base 1;

X-direction moving block 7, this X-direction moving block has dovetail guide rail, piezoelectric ceramic block D22, the groove 21 that is used to fix and drive the piezoelectric ceramic block D22 that moves in Z direction and the threaded hole 23 that extends along vertical direction, And the dovetail guide rail of the X-direction moving block 7 matches the dovetail groove of the Y-direction moving block 6;

The guide block 9 is on the same level as the Z-direction moving block 8, and the guide blocks 9 are distributed on both sides of the Z-direction moving block 8;

A guide block 9, the guide block has a dovetail groove, at least one pair of piezoelectric ceramic blocks C11, at least one pair of fixing devices C12 for fixing and driving the piezoelectric ceramic block C11 moving in the Z direction; and the moving block in the X direction The threaded hole 23 corresponding position guide block 9 of 7 is provided with through hole;

Z-direction moving block 8, the Z-direction moving block has a dovetail guide rail, and the dovetail-shaped guide rail of the Z-direction moving block 8 matches the dovetail groove of the guide block 9; the Z-direction moving block 8 is provided with evenly distributed clamps Threaded hole.

The computer is connected to the piezoelectric ceramic driving power supply that drives the piezoelectric ceramic block through the D/A device; the piezoelectric ceramic driving power is connected to the above piezoelectric ceramic block A17 to drive the fixture to move in the Y direction, and connected to the above piezoelectric ceramic block B5 to drive The clamp moves along the X direction, and the piezoelectric ceramic block C11 and the piezoelectric ceramic block D22 are connected to drive the clamp to move along the Z direction.

The utility model improves the implementation technology of thermal error compensation in precision machining, that is, after the thermal error compensation amount is predicted by the model, the compensation signal is not input to the servo feed system through the data bus of the numerical control machine tool to perform compensation movement, but the computer compensation signal The piezoelectric ceramic block is driven by inputting the piezoelectric ceramic driving power through the D/A device, so that the micro-driver generates a micro-displacement to compensate the thermal error in real time.

Description of drawings:

Fig. 1 is a schematic diagram of the overall structure of the utility model;

Fig. 2 is the front view of the utility model;

Fig. 3 is a schematic diagram of the structure of the X-direction moving block of the utility model.

Detailed ways

The micro-driver used for the fixture of the machine tool in precision machining according to the embodiment of the present invention will be described below with reference to accompanying drawings 1 to 3 .

The micro-driver of this embodiment mainly includes a base 1 , a Y-direction moving block 6 , an X-direction moving block 7 , a guide block 9 and a Z-direction moving block 8 .

The base 1 is installed on the machine tool table. The two ends of the base 1 are also provided with two bosses, and each boss is provided with two U-shaped grooves with the same spacing as the T-shaped grooves of the machine tool workbench for fixing the base 1 . A pair of piezoelectric ceramic blocks A17 and a fixing device A16 for the piezoelectric ceramic blocks A17 are installed on the base 1 . In addition, the base 1 is also provided with a dovetail groove and two adjustment screws A20.

The Y-direction moving block 6 is provided with a dovetail-shaped guide rail, which cooperates with the dovetail groove of the base 1, and the Y-direction moving block 6 moves in the Y direction under the action of the piezoelectric ceramic block A17. The gap between the dovetail guide rail of the Y-direction moving block 6 and the dovetail groove of the base 1 is adjusted through the insert A18. The adjustment of the inlay A18 is accomplished through the two adjustment screws A20 of the base 1 . A piezoelectric ceramic block B5 and a fixing device B4 for the piezoelectric ceramic block B5 are installed at both ends of the Y-direction moving block. In addition, the Y-direction moving block 6 is also provided with a dovetail groove and two adjusting screws B19.

The X-direction moving block 7 is provided with a dovetail-shaped guide rail, which cooperates with the dovetail groove of the Y-direction moving block 6 , and the X-direction moving block 7 moves in the X direction under the action of the piezoelectric ceramic block B5. The gap between the dovetail guide rail of the X-direction moving block 7 and the dovetail groove of the Y-direction moving block 6 is adjusted by the insert B3. The adjustment of the inlay B3 is accomplished through the two adjustment screws B19 of the Y-direction moving block 6 . The X-direction moving block 7 is also provided with four piezoelectric ceramic blocks D22 and fixing grooves 21 of the piezoelectric ceramic blocks D22, and four threaded holes 23 extending vertically.

A pair of guide blocks 9 are provided with through holes at corresponding positions of the threaded holes 23 of the X-direction moving block 7, and are fixed on the X-direction moving block 7 by four stud bolts A14. The guide block 9 is provided with a pair of piezoelectric ceramic blocks C11 and a fixing device C12 for the piezoelectric ceramic block 11 . In addition, the guide block 9 is also provided with a dovetail groove.

The Z-direction moving block 8 is provided with a dovetail-shaped guide rail, which cooperates with the dovetail groove of the guide block 9 to generate relative movement. The gap between the dovetail guide rail of the Z-direction moving block 8 and the dovetail groove of the guide block 9 is adjusted through the insert C10. The Z-direction moving block 8 is also provided with evenly distributed threaded holes for fixing the fixture. Driven by the piezoelectric ceramic block A11 and the piezoelectric ceramic block D22, the moving block 8 in the Z direction moves relative to the Z direction.

The fixing device A16 of the piezoelectric ceramic block A17 is fixed on the base 1 with the bolt A15; the fixing device B4 of the piezoelectric ceramic block B5 is fixed on the Y-direction moving block 6 with the bolt A2; the fixing device C12 of the piezoelectric ceramic block C11 is fixed with a bolt A13 is fixed on the guide block 9.

The utility model improves the real-time compensation effect of the thermal error of the machine tool on the one hand, and can perform real-time compensation on the thermal error without being restricted by the numerical control system on the other hand, which is convenient for popularization and application.

Claims (2)

1. A machine tool micro-execution fixture for precision machining, characterized in that it comprises from bottom to top: A base (1), the base has a dovetail groove, at least one pair of piezoelectric ceramic blocks A (17), at least one pair of fixing devices A (16) for fixing and driving the piezoelectric ceramic blocks A (17) moving in the Y direction, and Adjusting screw A (20); The Y-direction moving block (6), the Y-direction moving block has a dovetail guide rail, a dovetail groove, at least one pair of piezoelectric ceramic blocks B (5), at least one pair of piezoelectric ceramic blocks B (5) for fixedly driving X direction movement ) fixing device B (4) and adjusting screw B (19), and the dovetail guide rail on the Y-direction moving block (6) matches the dovetail groove of the base (1); The X-direction moving block (7), the X-direction moving block has a dovetail guide rail, a piezoelectric ceramic block D (22), a groove (21) for fixing and driving the piezoelectric ceramic block D (22) moving in the Z direction and A threaded hole (23) extending vertically, and the dovetail guide rail of the X-direction moving block (7) matches the dovetail groove of the Y-direction moving block (6); The guide block (9) is on the same horizontal plane as the Z-direction moving block (8), and the guide block (9) is distributed on both sides of the Z-direction moving block (8); A guide block (9), the guide block has a dovetail groove, at least one pair of piezoelectric ceramic blocks C (11), at least one pair of fixing devices C (12) for fixing and driving the piezoelectric ceramic block C (11) moving in the Z direction ); and the guide block (9) is provided with a through hole at the corresponding position of the threaded hole (23) of the X-direction moving block (7); The Z direction moving block (8), the Z direction moving block has a dovetail guide rail, and the Z direction moving block (8) dovetail guide rail matches the dovetail groove of the guide block (9); the Z direction moving block (8) is set There are evenly distributed threaded holes for mounting fixtures; The computer is connected to the piezoelectric ceramic drive power supply for driving the piezoelectric ceramic block through the D/A device; B (5) is used to drive the clamp to move along the X direction, and the piezoelectric ceramic block C (11) and piezoelectric ceramic block D (22) are connected to drive the clamp to move along the Z direction. 2. A machine tool micro-execution fixture for precision machining according to claim 1, characterized in that two bosses are arranged at both ends of the base (1), and each boss has at least two U-shaped slots with the same spacing as the T-slots of the machine table.

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