Blasting Nozzle with Escape Port for Abrasive Flow Control
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Solution Overview
Problem
The conventional blasting process for micro-machining faces challenges in achieving high precision and productivity due to the difficulty in controlling the blasting depth and surface roughness, particularly when the nozzle is moved closer to the workpiece, leading to disturbed flows and reduced area processing.
Innovation Solution
A nozzle design with a conical surface having an apex angle of 50∼70° at the distal end and a support member with rotational capability, allowing the nozzles to be arranged perpendicularly and rotated to correspond to the workpiece width, preventing reflected abrasives from remaining between the nozzle and the workpiece, and enabling efficient sweeping of a wider area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the nozzle is moved closer to the workpiece surface to suppress the broadening of abrasive flow, then the machining precision and boundary clarity are improved, but a disturbed flow is formed by reflected abrasives between the nozzle and workpiece, making it difficult to control blasting depth and surface roughness
Solution Approach 1:
The invention extracts and removes the harmful reflected abrasives from the space between the nozzle and workpiece by providing an escape path. The distal end of the ejecting portion is designed with a diameter smaller than the proximal end, creating a region that guides reflected abrasives outward and away from the blasting zone, preventing them from forming disturbed flows that would compromise depth and roughness control.
Solution Approach 2:
The varying diameter structure of the ejecting portion acts as an intermediary mechanism between the abrasive flow and the workpiece surface. This structural feature mediates the interaction by providing a controlled escape path for reflected abrasives, preventing direct re-collision with the workpiece and maintaining flow stability.
2Manufacturing precision
If the nozzle diameter is reduced to suppress the broadening of abrasive flow, then the machining precision is improved, but the area processed by one sweep of the nozzle is reduced, lowering productivity
Solution Approach 1:
The invention applies dynamics by making the ejecting portion's cross-sectional area variable along its length. The distal end has a smaller diameter than the proximal end, creating a dynamic flow channel that adapts to the abrasive flow pattern. This dynamic structure allows precise control of the abrasive jet at the tip while maintaining adequate flow volume for productive processing.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enhances precision and productivity by ensuring that reflected abrasives easily escape, maintaining clear boundaries between processed and non-processed areas and allowing for efficient processing of larger areas with each nozzle sweep.
Implementation Method 1
which portion can prevent the abrasives that are blasted toward the surface of the work and are reflected from the surface from remaining within the space between the surface of the work and the distal end of the ejecting portion because of the collision of the reflected abrasives with the distal end of the ejecting portion
Data Source
Figure 1
Figure 2
Figure 3(A)~3(B)
AI summary
A nozzle, a nozzle unit having a plurality of nozzles, and a blasting machine equipped with the nozzle unit, which can achieve a micro-machining with a high precision and a high productivity for the blasting process, are provided. Since the portion for escape 13c is formed at the distal end of the ejecting portion 13, if the distance between the surface of the work and the nozzle 11 is shortened to suppress the broadening of the flow of the abrasives, the reflected abrasives do not remain within the space between the surface of the work and the distal end of the ejecting portion 13. Thus, the blasting process with a high precision can be achieved. Further, since the nozzle 11m and the nozzle 11n can be arranged so as to correspond to the width of the surface of the work to be processed by the rotational device 16, it is possible to blast a wider area of the surface of the work while the nozzle unit 10 or the blasting machine 20 sweep one time. Thus, the high productivity of the blasting process can be achieved.