Method for the hydro-erosive grinding of components

Patent metadata

Field	Value
Publication number	US-11878392-B2
Application number	US-201915734222-A
Country	US
Kind code	B2
Filing date	May 21, 2019
Priority date	Jun 1, 2018
Publication date	Jan 23, 2024
Grant date	Jan 23, 2024

Abstract

The invention relates to a method for the hydro-erosive processing of components, in which hydro-erosive grinding a liquid containing grinding particles flows over surfaces of the component (1), in a device having a channel (3), through which the liquid containing grinding particles flows under pressure and in which the component (1) to be ground is held and in which a valve (5) is positioned upstream of the component (1) in the flow direction, by means of which valve the flow of the liquid can be adjusted.

First claim

The invention claimed is:

1. A method for the hydroerosive processing of components, in which a liquid comprising grinding particles flows over surfaces of the component, in a device having a channel through which the liquid comprising grinding particles flows under pressure and in which the component to be processed is received, and in which a valve, with which the flow of the liquid can be adjusted, is positioned in front of the component in the flow direction, comprising the following steps:
(a) closing the valve in front of the component and generating a predetermined pressure in the liquid comprising the grinding particles;
(b) opening the valve in front of the component and setting up a first volumetric flow of the liquid comprising the grinding particles, which is from 5 to 80% less than a product of a minimum setpoint cross-sectional area flowed through and a maximum permissible speed at this position, without the predetermined pressure generated in step (a) being changed;
(c) measuring a pressure difference which is set up between a position in front of the component to be processed and a position behind the component to be processed in the liquid comprising the grinding particles;
(d) increasing the volumetric flow of the liquid comprising the grinding particles until the volumetric flow corresponds to the product of the minimum setpoint cross-sectional area flowed through and the maximum permissible speed at this position, as soon as the pressure difference measured in step (c) has decreased by from 5 to 80%;
(e) closing the valve in front of the component and terminating the flow, as soon as the volumetric flow in step (d) corresponds to the product of the minimum setpoint cross-sectional area flowed through and the maximum permissible speed at this position.

2. The method according to claim 1 , wherein the volumetric flow is increased continuously, constantly and monotonically increasingly in step (d).

3. The method according to claim 1 , wherein the maximum permissible speed at the position of the minimum setpoint cross-sectional area flowed through lies in the range of from 1 m/s to 99% of the speed of sound.

4. The method according to claim 1 , wherein the maximum permissible speed is determined by a simulation calculation.

5. The method according to claim 1 , wherein a shape of the component is modeled in a simulation calculation before the grinding process.

6. The method according to claim 1 , wherein, in the case of outer surfaces to be processed, the component is positioned inside the channel so that the liquid comprising grinding particles can flow over the outer surfaces.

7. The method according to claim 1 , wherein, in the case of inner surfaces to be processed, the component is fitted into the channel in such a way that all of the liquid comprising grinding particles flows through the interior of the component to be processed.

8. The method according to claim 1 , wherein, in order to detect cavitation, a sound sensor is positioned in the channel behind the component or at the component, and if cavitation occurs the volumetric flow is reduced until cavitation is no longer detected.

9. The method according to claim 1 , wherein the liquid comprising grinding particles is provided in a storage container and flows back into the storage container after flowing over the surfaces to be processed of the component.

10. The method according to claim 9 , wherein the liquid comprising grinding particles is relaxed before flowing into the storage container.

11. The method according to claim 1 , wherein a second valve is positioned behind the component, and the volumetric flow and the pressure in the liquid comprising the grinding particles are adjusted by means of the first valve and the second valve.

12. The method according to claim 11 , wherein, before closing the valve in front of the component in step (e), the second valve behind the component is closed as soon as the volumetric flow corresponds to the product of the minimum setpoint cross-sectional area flowed through and the maximum permissible speed at this position in step (d).

13. The method according to claim 1 , wherein the pressure of the liquid comprising grinding particles is measured in step (a) with a first pressure sensor, which is positioned between the valve in front of the component and a pump, with which the pressure and the flow of the liquid comprising grinding particles are generated.

14. The method according to claim 1 , wherein, in order to determine the pressure difference, the pressure is measured with a second pressure sensor, which is positioned between the valve in front of the component and the component, and a third pressure sensor, which is positioned behind the component.

Assignees

• Basf Se

Inventors

• Weickert Mathias

Classifications

• B24C3/327 Primary

  by an axially-moving flow of abrasive particles without passing a blast gun, impeller or the like along the internal surface (polishing or abrading surfaces using plastically deformable grinding compound, moved relatively to the workpiece under the influence of pressure B24B31/116) · CPC title