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Spindle with piezoelectric actuators

A piezoelectric actuator, the technology of the actuator, which is applied in the direction of fluids that utilize vibration, components of boring machines/drilling machines, manufacturing tools, etc., can solve the problems of increased axial vibration power and so on.

Pending Publication Date: 2022-02-11
MITIS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at high frequencies, the inertia of the moving parts results in a significant increase in the power required to generate axial vibrations

Method used

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  • Spindle with piezoelectric actuators
  • Spindle with piezoelectric actuators
  • Spindle with piezoelectric actuators

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0092] will now refer to figure 1 An example of the spindle 10 according to the present invention is described.

[0093] Here, the spindle 10 is an electrospindle, since it includes an electric motor 11, for example a synchronous motor with permanent magnets.

[0094] The motor 11 drives the shaft 12 to rotate through a connecting rod 14 which allows a certain axial clearance from the shaft 12 sufficient to cause the shaft to vibrate axially along its longitudinal axis with the desired amplitude.

[0095] The shaft 12 drives at its end opposite the motor 11 a tool holder 13 which can accommodate any type of tool, such as a drill or any other tool for e.g. figure 1 schematically shown.

[0096] The interface between tool holder and tool can be of the clamp type and produced according to various standardized standards or proprietary standards such as ER or D types in particular.

[0097] The tool can also be held in the tool holder by hydraulic clamping, heat shrinking, mecha...

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PUM

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Abstract

A spindle (10) for carrying out machining assisted by non-ultrasonic axial oscillations comprises: a tool-bearing shaft (12), and an exciting portion, for subjecting the shaft to non-ultrasonic axial oscillations, especially during its rotation, this exciting portion comprising: a first exciting stage, comprising at least one piezoelectric actuator (24), and a second exciting stage comprising at least one piezoelectric actuator (22) and having a non-zero axial overlap with the first exciting stage, the actuators of the two stages being arranged so that their effects add.

Description

technical field [0001] The invention relates to spindles for machine tools or robots. Background technique [0002] Machine tools, in particular numerically controlled machine tools, comprise a mobile support, especially moving in three directions, which holds an electro-spindle, which is a spindle equipped with a motor and a tool holder to drive the tool holder in rotation about its axis. [0003] It has been proposed to subject rotationally driven tools to ultrasonic vibrations ("ultrasonic machining" or UM) to increase the effectiveness of the tools and to allow drilling of hard materials such as glass. Ultrasonic vibration can generate shear during cutting, but has no significant effect on chip thickness and ejection. [0004] Application US 2011 / 0222975 describes a UM module comprising a transducer arranged to receive a knife. The transducer is powered by a rotating electrical contact. [0005] Patent US 3561462 describes another example of a UM spindle comprising an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23Q1/70B06B1/06B23B37/00B23B47/34B23Q1/34B23Q5/28B23Q5/32
CPCB23Q1/70B23Q1/34B23Q5/32B23Q5/28B23B47/34B06B2201/73B06B1/0607B23B2260/108B23Q1/64B23Q11/127B23Q2705/14
Inventor 西尔万·拉波特
Owner MITIS