Device for precision machining of sphere, and method for precision machining of sphere using same

Patent metadata

Field	Value
Publication number	US-2024335921-A1
Application number	US-202318686872-A
Country	US
Kind code	A1
Filing date	Apr 27, 2023
Priority date	Apr 6, 2023
Publication date	Oct 10, 2024
Grant date	—

Abstract

A sphere precision machining device and a machining method comprise a cavity, an abrasive grain stream, and a circulation device. The cavity holds the workpiece, and comprises two hollow hemispheres, each of said two hemispheres being provided with a main flow channel. Said main flow channel is connected to the cavity. One end of the main flow path of each of the two said hemispheres is connected to a circulating means by which a stream of abrasive grains is made to grind the workpiece. A plurality of main flow channels are disposed homogeneously inside the hemisphere, each of said main flow channels being provided with a plurality of branch flow channels connected to the cavity, said branch flow channels tapering in the flow direction. The present disclosure uses the difference in abrasive grain flow pressure on the surface of the workpiece to achieve precision machining.

First claim

What is claimed is:

1 . A sphere precision machining device, comprising:
a cavity, an abrasive grain stream, and a circulation device, wherein the cavity holds a workpiece, the cavity consists of two hollow hemispheres, and the two hemispheres are each provided with a main flow channel, the main flow channel being connected to the cavity; one end of the main flow path of each of the two hemispheres is connected to a circulating device, and by means of the circulating device, a stream of abrasive grains grinds the workpiece; and a plurality of main flow channels are disposed homogeneously inside the hemispheres, and each of the main flow channels is provided with a plurality of branched flow channels connecting to the cavities, the branched flow channels being tapered in a flow direction.

2 . The sphere precision machining device according to claim 2 , wherein an axis of a branched runner is at an angle of 20° to 45° to a radius direction in which it is located, so that the workpiece is rotated counterclockwise by the impact of the abrasive grain stream.

3 . The sphere precision machining device according to claim 1 , wherein a sealing assembly is provided for sealing between the docking surfaces of the two hemispheres.

4 . The sphere precision machining device according to claim 1 , further comprising a control system, a vibration sensor, and a pressure sensor;
a number of the vibration sensors are mounted on the inner wall of the cavity for detecting vibration signals generated by an abrasive grain flow; the pressure sensor is configured to detect the pressure of the abrasive grain stream at the output of the circulation device; and the control system regulates the output pressure of the circulation device in accordance with the vibration signal.

5 . A processing method of the sphere precision machining device according to claim 1 , further comprising steps of:
placing the workpiece into the cavity and installing the hemispheres in a sealed manner; pumping the abrasive grain stream to the cavity grinding workpiece by means of a circulation device; detecting, by a number of vibration sensors, vibration signals generated by an abrasive grain flow, and regulating, by a control system, the output pressure of the circulation device according to the vibration signals; and after a grinding process is completed, taking out the workpiece to check whether the shape accuracy and surface quality meet the set requirements, if not, putting the workpiece back into the cavity for processing.

6 . The processing method according to claim 5 , characterized in that the control system adjusts the output pressure of the circulation device according to the vibration signal, further comprising:
as an initial state, setting the output pressure of the circulation device to P 0 ; after processing for a time t 1 , comparing, by the control system, the average value S t1 of a number of vibration signals with a first set value according to the average value St of the number of vibration signals, and when the average value Su is less than the first set value, completing the grinding process; and when the average value S t1 is greater than the first set value, increasing, by the control system, the output pressure of the circulation device to P 1 ; after adjusting the pressure and processing for a time t 2 , when the average value S t2 is greater than the first set value and the average value S t2 is less than the average value S t2 , reducing, by the control system, the output pressure of the circulation device to P 2 , wherein P 1 >P 2 >P 0 , until the average value Su is less than the first set value.

7 . A processing method of the sphere precision machining device according to claim 2 , further comprising steps of:
placing the workpiece into the cavity and installing the hemispheres in a sealed manner; pumping the abrasive grain stream to the cavity grinding workpiece by means of a circulation device; detecting, by a number of vibration sensors, vibration signals generated by an abrasive grain flow, and regulating, by a control system, the output pressure of the circulation device according to the vibration signals; and after a grinding process is completed, taking out the workpiece to check whether the shape accuracy and surface quality meet the set requirements, if not, putting the workpiece back into the cavity for processing.

8 . A processing method of the sphere precision machining device according to claim 3 , further comprising steps of:
placing the workpiece into the cavity and installing the hemispheres in a sealed manner; pumping the abrasive grain stream to the cavity grinding workpiece by means of a circulation device; detecting, by a number of vibration sensors, vibration signals generated by an abrasive grain flow, and regulating, by a control system, the output pressure of the circulation device according to the vibration signals; and after a grinding process is completed, taking out the workpiece to check whether the shape accuracy and surface quality meet the set requirements, if not, putting the workpiece back into the cavity for processing.

9 . A processing method of the sphere precision machining device according to claim 4 , further comprising steps of:
placing the workpiece into the cavity and installing the hemispheres in a sealed manner; pumping the abrasive grain stream to the cavity grinding workpiece by means of a circulation device; detecting, by a number of vibration sensors, vibration signals generated by an abrasive grain flow, and regulating, by a control system, the output pressure of the circulation device according to the vibration signals; and after a grinding process is completed, taking out the workpiece to check whether the shape accuracy and surface quality meet the set requirements, if not, putting the workpiece back into the cavity for processing.

10 . A processing method of the sphere precision machining device according to claim 5 , further comprising steps of:
placing the workpiece into the cavity and installing the hemispheres in a sealed manner; pumping the abrasive grain stream to the cavity grinding workpiece by means of a circulation device; detecting, by a number of vibration sensors, vibration signals generated by an abrasive grain flow, and regulating, by a control system, the output pressure of the circulation device according to the vibration signals; and after a grinding process is completed, taking out the workpiece to check whether the shape accuracy and surface quality meet the set requirements, if not, putting the workpiece back into the cavity for processing.

Assignees

• Univ Jiangsu

Inventors

• Chen Lan
• Zhang Xinzhou
• Yang Zhiwei
• Lu Linkai
• Yu Guanxi
• Ren Xudong

Classifications

• B24B11/02 Primary

  for grinding balls · CPC title

• B24B31/00

  Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor (abrasive blasting machines B24C3/26) · CPC title

• B24B31/116

  using plastically deformable grinding compound, moved relatively to the workpiece under the influence of pressure · CPC title

• B24C3/32 Primary

  designed for abrasive blasting of particular work, e.g. the internal surfaces of cylinder blocks (B24C3/08, B24C3/18 take precedence) · CPC title

• B24C1/08

  for polishing surfaces, e.g. {smoothing a surface} by making use of liquid-borne abrasives · CPC title