Supporting device and method for large thin-walled part

Patent metadata

Field	Value
Publication number	US-11618116-B2
Application number	US-202017424392-A
Country	US
Kind code	B2
Filing date	Feb 17, 2020
Priority date	Feb 19, 2019
Publication date	Apr 4, 2023
Grant date	Apr 4, 2023

Abstract

A supporting device and method for a large thin-walled part is disclosed. The supporting device comprises a processing device and a supporting device. A workpiece is positioned between the processing device and the supporting device and is clamped at a periphery in a flexible clamping mode. A cutter in the processing device is connected with an iron core. A coil is wound on the iron core. When the coil is energized, a magnetic field is generated around the coil. A blade part of the cutter is in contact with a processing side of the workpiece. The supporting method combines the magnetorheological fluid technology with the jet supporting technology, and uses a jet impact force to offset part of a milling force. The current magnitude and winding mode of the coil are changed to control magnetic field intensity. The magnetorheological fluid is cured instantly to support the workpiece.

First claim

The invention claimed is:

1. A supporting device for a large thin-walled part, comprising a processing device and a supporting device, wherein a workpiece is positioned between the processing device and the supporting device;
the processing device comprises a cutter, a coil, and an iron core; the end of the cutter is connected with the iron core; the coil is wound on the iron core; when the coil is energized, a magnetic field is generated around the coil; the current magnitude and winding mode of the coil can be changed to accurately control magnetic field intensity to control the magnitude of a supporting force; a blade part of the cutter is in contact with a processing side of the workpiece to remove the material of the workpiece; the supporting device comprises magnetorheological fluid and cured magnetorheological fluid; the cured magnetorheological fluid is near the surface of the workpiece and plays a supporting role on the workpiece, wherein the device also comprises an auxiliary device; and the workpiece is clamped at a periphery in a flexible clamping mode;
the processing device also comprises a servo drive device; the cutter is connected with the servo drive device and moves under the control of the servo drive device according to a processing path;
the supporting device also comprises a nozzle, magnetic particles, and a magnetic particle chain; the nozzle is located on the other side of the workpiece; a through hole is arranged inside the nozzle to serve as a flow passage of the magnetorheological fluid; the nozzle is connected with the servo drive device, and can move in three directions of X, Y and Z to ensure that the supporting device can move with the cutter and ensure the processing stiffness of the workpiece; the magnetic particles are dispersed in the magnetorheological fluid; the magnetorheological fluid is ejected through the nozzle; when the coil is energized, the magnetic particles in the magnetorheological fluid are gathered under the action of a magnetic field force to form the magnetic particle chain, so that the magnetorheological fluid is converted into the cured magnetorheological fluid;
the auxiliary device comprises a collecting box, a magnet, a hose and a hydraulic pump; the collecting box is located under a jet; the collecting box is connected with the servo drive device, and moves with the nozzle; the collecting box collects the magnetorheological fluid flowing down from the workpiece and splashing in the air; the magnet is located below the collecting box and is used to provide a magnetic field that can attract the magnetorheological fluid into the collecting box; the hose is connected with the collecting box, the hydraulic pump and the nozzle; the magnetorheological fluid is conveyed from the collecting box into the nozzle to realize cyclic utilization of the magnetorheological fluid; and the hydraulic pump is connected with the hose to inject the magnetorheological fluid into the nozzle at certain speed and pressure.

2. A supporting method for a large thin-walled part based on the device of claim 1 , comprising the following steps based on the processing device and the supporting device:
step 1: setting the magnitude of a jet impact force of the nozzle according to a magnitude of a milling force, so that the jet impact force can offset most of the milling force; and obtaining a size of an initial jet area according to the diameter of the nozzle;
step 2: according to the mutual offset between the sum of the magnetic field force and the jet impact force and the milling force, obtaining the magnitude of a required magnetic field force;
designing required magnetic field intensity and current, as well as the number of turns and arrangement mode of the coil according to the magnitude of the magnetic field force; and
installing the coil according to the required magnetic field;
step 3: energizing the coil to generate the magnetic field, and moving the cutter to an initial processing position;
step 4: controlling the nozzle to move to the other side of the cutter relative to the workpiece through a servo drive mechanism, and ensuring that a distance between the nozzle and the workpiece is within the area of an initial jet segment; starting the hydraulic pump to eject the magnetorheological fluid from the nozzle; then curing the magnetorheological fluid under the action of the magnetic field to support the workpiece;
installing the magnet on the collecting box; and moving the collecting box by the servo drive device to ensure that the collecting box is always under the jet;
step 5: controlling the cutter to conduct processing according to a processing track and attitude by the servo drive device, and simultaneously controlling the nozzle to move with the cutter to realize the moving support for the workpiece;
step 6: after the end of the processing, deenergizing the coil, and moving the cutter to an initial position; closing the hydraulic pump; and stopping ejecting the magnetorheological fluid by the nozzle, while moving to the initial position.

Assignees

• Univ Dalian Tech

Inventors

• Guo Jiang
• Wang Bin
• Song Chuanping

Classifications

• B23C3/00

  Milling particular work; Special milling operations; Machines therefor (milling gear-teeth B23F, {heat assisted machining B23P25/00}) · CPC title

• B23Q3/086 Primary

  using a solidifying liquid, e.g. with freezing, setting or hardening means · CPC title

• B23Q3/065

  for holding workpieces being specially deformable, e.g. made from thin-walled or elastic material · CPC title

• B23C2220/48

  Methods of milling not otherwise provided for · CPC title

• B23C9/00 Primary

  Details or accessories so far as specially adapted to milling machines or cutter (drives, control devices, or accessories, in general B23Q) · CPC title