Portable magneto-rheological flexible clamping device and clamping method

Abstract

The invention discloses a portable magneto-rheological flexible clamping device and method, belongs to the technical field of machining clamping, and relates to the portable magneto-rheological flexible clamping device and method. The device is composed of a convex die and a concave die. The clamping method comprises the steps that firstly, the concave die and the convex die are placed on two sides of a blade so that the concave die and the convex die are matched; a magnetorheological fluid storage bag is extruded by a piston so that an elastic soft film expands and extends to be tightly attached to a blade body; a long switch permanent magnet is turned on, an excitation magnetic field is applied, a magnetorheological fluid is excited and solidified, and reliable clamping of the blade is achieved; and after the blade is machined, the magnetic field of the long switch permanent magnet is closed, a clamping force is removed, and the blade is taken out. A shell type piston is adopted to extrude the magnetorheological fluid storage bag to make the soft film be rapidly attached to the blade so as to achieve rapid positioning of the blade, the magnetorheological fluid in the soft film israpidly solidified through controllable excitation and works in an extrusion mode, and supporting rigidity and reliability are guaranteed. And on the basis of avoiding secondary clamping, machining efficiency is improved, and machining precision is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of machining and clamping, and relates to a portable magnetorheological flexible clamping device and a clamping method. Background technique [0002] Thin-walled parts are important parts of aviation gas turbine engines. Reliable clamping of thin-walled parts represented by blades is the core link to ensure efficient material removal and final machining geometric accuracy of parts. The blade machining process requires reliable blade clamping, and the suspended area should be minimized to prevent vibration deformation. Generally, blades cannot be directly clamped by claws, and blades are thin-walled workpieces. Due to poor rigidity, vibration deformation, force deformation, heat deformation, etc. are easy to occur during processing, and their shape and size tolerances cannot be guaranteed. The primary technical problem faced in processing is the blade clamping scheme. At present, for the processing of blade...

AI Technical Summary

Problems solved by technology

However, there are some problems with this method: first, the low-melting-point alloy vapor is toxic, which affects health and pollutes the environment; second, the bismuth element in the low-melting-point alloy penetrates into the blade, resulting in a decrease in the fatigue strength of the blade, which easily induces blade fracture; third, the cast alloy The blade needs to be removed before pouring, and the fixture needs to be clamped twice with the workbench after pouring, resulting in positioning error and affecting the machining accuracy

However, the details of the application of the external magnetic field are not explained. In actual processing, the external magnetic field may affect the machining trajectory of the tool.

In 2015, Zhang Dinghua et al. invented a flexible support device in the patent CN201510046697.0. The lower part of the blade body is immersed in magnetorheology, and the flexible support is implemented through external excitation, which can meet the clamping process of the upper part of the blade body. required, but subsequent cleaning treatment is required

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