CN-117620907-B - Depth-controllable complex micro through hole inner surface strengthening device and method

CN117620907BCN 117620907 BCN117620907 BCN 117620907BCN-117620907-B

Abstract

The invention discloses a depth-controllable complex micro through hole inner surface strengthening device and method, wherein a nozzle is provided with a high-pressure nozzle and four low-pressure nozzles, the four low-pressure nozzles are identical in structure and are uniformly distributed on the outer side of the high-pressure nozzle along the circumferential direction, an outlet of a reservoir is connected with an inlet of a high-pressure plunger pump through a pipeline sequentially through a first valve and a filter, the outlet of the high-pressure plunger pump is connected with the high-pressure nozzle through a pipeline through a relief valve and a first pressure gauge to form a high-pressure pipeline, the high-pressure plunger pump is sequentially and electrically connected with a motor and a frequency converter five, water and abrasive particles are stored in a reservoir II, each outlet of the reservoir II is respectively connected with a corresponding valve through a centrifugal pump and a corresponding low-pressure nozzle to form four low-pressure pipelines, each centrifugal pump is electrically connected with a frequency converter, and the incident pressure entering the high-pressure nozzle and the low-pressure nozzle is controlled through the frequency converter in the high-pressure pipeline to strengthen the inner surface of the micro through the frequency converter.

Inventors

WANG YUN
LI FUZHU
LIU WEILI
ZHANG TAILIANG
ZHANG KOUBAO
YU LIANG
HE PEIYU
ZHANG LINQIANG
HU XINYAO
YU CHAO
LEI ZHIYUAN
Pan Shuaixing
YANG KAIWEN

Assignees

江苏大学

Dates

Publication Date: 20260512
Application Date: 20231225

Claims (10)

1. A depth-controllable complex micro through hole inner surface strengthening device is provided with a first water storage tank (1), a second water storage tank (9) and a nozzle (15), and is characterized in that the nozzle (15) is provided with a high-pressure spray opening and four low-pressure spray openings, the high-pressure spray opening (23) is positioned at the right center of the nozzle (15), the four low-pressure spray openings have the same structure and are uniformly distributed along the circumferential direction outside the high-pressure spray opening (23), water is stored in the first water storage tank (1), an outlet of the first water storage tank (1) is connected with an inlet of a high-pressure plunger pump (6) through a pipeline sequentially through a first valve and a filter (3), an outlet of the high-pressure plunger pump (6) is connected with the high-pressure spray opening (23) through a pipeline through a relief valve (7) and a first pressure gauge (8) to form a high-pressure pipeline, the high-pressure plunger pump (6) is sequentially electrically connected with a motor (5) and a frequency converter (4), water and a frequency converter (22) are stored in the second water storage tank (9), each outlet is respectively provided with four outlets through a corresponding valve, a first pressure gauge (10), a conformal abrasive particle pump (10) is connected with the first pressure gauge (17) through a corresponding low-pressure gauge (17) and a transparent abrasive particle to be processed through the nozzle (17) on a transparent workpiece to be processed through the first water tank (17) through the nozzle, the low pressure gauge (17) and the transparent abrasive particle processing device, the highest water level of the water in the transparent water tank (17) does not contact the micro through hole, the five frequency converters (4) and the four frequency converters in the low-pressure pipeline are regulated, the rotating speeds of the high-pressure plunger pump (6) and each centrifugal pump (10) are controlled, and areas with different depths on the inner surface of the micro through hole are processed.
2. The device for strengthening the inner surface of the complex micro through hole as set forth in claim 1, wherein the high-pressure nozzle (23) is formed by continuously shrinking a section (231), a cylindrical section (232) and an expanding section (233) from top to bottom at the lower section near the micro through hole (20), the caliber of the shrinking section (231) gradually decreases from top to bottom, the caliber of the cylindrical section (232) is the same as the lower port diameter of the shrinking section (231), the caliber of the expanding section (233) gradually increases from top to bottom, and the lower sections of the four low-pressure nozzles gradually shrink from top to bottom towards the high-pressure nozzle (23) to form a cone shape.
3. The device for strengthening the inner surface of the complex micro through hole as claimed in claim 1, wherein the transparent water tank (17) is connected with the reservoir III (18) through a pipeline.
4. The device for strengthening the inner surface of a complex micro through hole according to claim 1, wherein a stirring device (16) is arranged in the second reservoir (9).
5. The apparatus for reinforcing the inner surface of a complex micro-hole as set forth in claim 2, wherein the inner diameter of the micro-hole is larger than the inner diameter of the nozzle (15), the contraction angle of the contraction section (231) is 40 °, and the expansion angle of the expansion section (233) is 60 °.
6. A method of strengthening the inner surface of a complex micro-via as set forth in claim 1, wherein: When the front end surface area of the micro through hole is strengthened, the rotating speeds of the high-pressure plunger pump (6) and the four centrifugal pumps (10) are reduced simultaneously, so that cavitation water jet carrying abrasive particles (22) is popular Cheng Bianduan; When the rear end surface area of the micro hole is reinforced, the rotating speeds of the high-pressure plunger pump (6) and the four centrifugal pumps (10) are increased simultaneously, so that the cavitation water jet flow carrying abrasive particles (22) is prolonged; When the bending area of the micro through hole is strengthened, the fluid speed in the high-pressure nozzle (23) is kept unchanged, the fluid speed of the low-pressure nozzle corresponding to the side area with the larger bending radius of the bending area is reduced, and the fluid speed of the low-pressure nozzle corresponding to the side area with the smaller bending radius is increased, so that the speed difference between the low-speed jet and the high-speed jet at the side with the larger bending radius is larger than the speed difference between the low-speed jet and the high-speed jet at the side area with the smaller bending radius.
7. A strengthening method as claimed in claim 6, wherein the initial pressure of the high-velocity injection into the high-pressure nozzle (23) is at least 20MPa, and the initial pressure is not more than 1000 times the low-velocity injection into the low-pressure nozzle.
8. The method for reinforcing a hollow fiber according to claim 7, wherein when the rotation speed of the high-pressure plunger pump (6) is reduced while reinforcing the front end surface region of the minute through hole, the high-velocity injection pressure into the high-pressure nozzle (23) is reduced to half of the initial pressure.
9. The method for reinforcing a rear end surface region of a fine through hole according to claim 7, wherein the high-velocity injection pressure into the high-pressure nozzle (23) is increased to 1.5 times the initial pressure.
10. The method of reinforcing a small through hole according to claim 7, wherein when reinforcing a curved region of the small through hole, a jet incidence pressure of a low-pressure nozzle corresponding to a side having a larger radius of curvature is smallest, a jet incidence pressure of a low-pressure nozzle corresponding to a side having a smaller radius of curvature on the opposite side is largest, and jet incidence pressures of the remaining two low-pressure nozzles are the same.

Description

Depth-controllable complex micro through hole inner surface strengthening device and method Technical Field The invention relates to the field of strengthening treatment of the inner surface of a micro through hole, in particular to a processing technology for strengthening the inner surface of the micro through hole by adopting an artificial submerged cavitation jet flow carrying abrasive materials. Background The micro through holes are used as parts widely applied to daily life, the general aperture is smaller, the length-diameter ratio is larger, and part of the micro through holes have regions with complex shapes, such as bending regions and the like. With the rapid development of industries such as electronic information and the like, the requirements on the precision, the strength and the like of machine parts in industrial production are gradually improved, the technology for strengthening the tiny through holes is a difficult problem, and the existing strengthening technology still has some difficulties in meeting the requirements on different depths, different areas, different surface treatments of all parts and the like for strengthening tiny through holes with complex shapes. The cavitation water jet technology can utilize huge energy generated when cavitation bubbles in liquid collapse to carry out material strengthening processing, and is an effective means for strengthening micro through holes. Compared with the traditional reinforced processing technology, the cavitation water jet technology is more controllable, more environment-friendly and lower in cost. Most of the existing cavitation water jet technologies are artificial submerged technologies, for example, the technology is named as "an artificial submerged cavitation water jet micro part plastic forming device and method" in China patent number ZL 201810562060.0. However, these cavitation water jet technologies have a problem of small effective target distance, and due to the limitation of working conditions, working in a liquid environment is required, and the problem of size problem is that the processing cannot be performed due to the tiny through holes attached to large parts. The artificial submerged cavitation jet technology is characterized in that a sleeve is added to the periphery of a conventional cavitation nozzle, the Chinese patent number is 202210961025.2, the name is a non-submerged ultrasonic cavitation auxiliary water jet nozzle structure, a submerged environment is provided for high-speed jet ejected from an internal cavitation nozzle in a mode of introducing low-speed jet into the peripheral sleeve, and then shearing action between the high-speed jet and the low-speed jet is promoted to form a low-pressure area, and cavitation effect occurs when the pressure is lower than saturated vapor pressure, so that cavitation jet is generated. The cavitation jet technology can effectively overcome the existence point of submerged cavitation water jet, but the problems of how to control different depths and different areas of the artificially submerged cavitation jet reinforced micro through holes, improve the processing efficiency of the complicated shape area and the like are not solved effectively. Disclosure of Invention In order to solve the problems that the existing artificial submerged cavitation water jet reinforcement processing of the inner surface of the micro hole is limited by processing conditions, different areas cannot be processed in a segmented mode, the reinforcement efficiency of the complex-shape area is low, and the like, the invention creatively provides a novel complex micro through hole inner surface reinforcement device with controllable depth and an inner surface reinforcement method thereof, the reinforcement of each depth and bending area of the inner surface of the micro through hole is realized, and the continuity, uniformity and reinforcement efficiency of the reinforcement processing of the inner surface of the micro hole are improved. The invention discloses a depth-controllable complex micro through hole inner surface strengthening device, which adopts the technical scheme that the depth-controllable complex micro through hole inner surface strengthening device comprises a first water storage tank, a second water storage tank and a nozzle, wherein the nozzle is provided with a high-pressure nozzle and four low-pressure nozzles, the high-pressure nozzle is positioned at the right center of the nozzle, the four low-pressure nozzles have the same structure and are uniformly distributed along the circumferential direction outside the high-pressure nozzle, water is stored in the first water storage tank, an outlet of the first water storage tank is connected with an inlet of a high-pressure plunger pump through a pipeline sequentially through a first valve and a filter, the outlet of the high-pressure plunger pump is connected with the high-pressure nozzle through a pressure relief valve and a fi