Cutting Tool Suction Nozzle Using the Coanda Effect for Debris Removal
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Solution Overview
Problem
Existing shaping tools for cutting metal or non-metal materials face challenges in efficiently removing flakes, which lead to increased rejects, cleaning efforts, and tool downtimes due to the complexity and limited integration of suction devices.
Innovation Solution
A shaping tool with a suction nozzle using the Coanda effect, integrated externally to the cutting blade, featuring a slot-shaped or slit nozzle opening that connects to a vacuum pump, allowing for efficient removal of flakes without requiring extensive tool sealing or installation space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If integrated extraction channels are provided in the die and punch below the blank holder, then debris can be extracted during cutting, but the entire tool needs to be sealed to achieve the necessary suction power
Solution Approach 1:
The suction device is extracted from the traditional integrated channel system in the die and punch, and repositioned as an external device. The suction device is arranged outside the tool insert in the area of the engagement contour, with a suction opening that can be brought into engagement with the workpiece during cutting. This extraction eliminates the need for complex sealed channels throughout the tool structure.
Solution Approach 2:
The debris extraction function is segmented from the main tool body (die and punch). Instead of having extraction channels integrated into the entire tool structure, the suction device is separated as an independent external component that engages locally at the cutting zone. This segmentation reduces the overall sealing requirements to only the immediate vicinity of the suction opening.
2Object-generated harmful factors
If a Venturi nozzle with suction channel is integrated into the tool insert, then material particles can be extracted during trimming, but the installation space in the tool insert is limited
Solution Approach 1:
The suction device is taken out from the constrained internal space of the tool insert and positioned externally. This allows the suction mechanism to have adequate size and complexity without consuming valuable installation space within the tool insert, while still maintaining effective particle extraction capability at the cutting zone.
3Productivity
If traditional suction devices are used, then debris can be removed, but the structure becomes complex and requires extensive tool sealing
Solution Approach 1:
The suction device utilizes the Coanda effect, where a jet of compressed air or gas attaches to a curved surface and creates a low-pressure region that automatically draws in debris particles. This self-inducing mechanism eliminates the need for complex mechanical suction components and extensive sealing systems, as the fluid dynamic effect performs the suction function inherently.
Solution Approach 2:
The invention employs pneumatic principles through the use of compressed air or gas jets that utilize the Coanda effect to generate suction. This pneumatic approach replaces complex mechanical suction devices and sealed channel systems with a simpler fluid-based mechanism that achieves effective debris removal without requiring extensive tool sealing.
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
The solution enables a structurally simple and effective suction of flakes, reducing rejects and maintenance efforts by utilizing the Coanda effect to create a high pumping speed with low air consumption, thus minimizing downtime and improving production efficiency.
Implementation Method 1
a suction device with a suction nozzle (4) arranged externally from the tool insert (3) in the area of the engagement contour (3.1) for the extraction of debris and having a nozzle opening (4.1), which is connected to a vacuum pump utilizing the Coanda effect
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention relates to a forming tool (1) for forming metal or non-metal materials, comprising at least one base body (2) on which at least one tool insert (3) with an engagement contour (3.1) is arranged, and a suction nozzle (4) arranged in the region of the engagement contour (3.1) for the extraction of debris (F) and having a nozzle opening (4.1), which is connected to a vacuum pump (10) utilizing the Coanda effect. In an alternative forming tool, an extraction channel (8) with an extraction opening (8.1) provided in the region of an engagement contour (3.1) and a discharge opening (8.2) is integrated into a tool insert (3) for the extraction of debris (F).