Cut-Off Machine Hood Layout for Maximum Cutting Depth
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Solution Overview
Problem
Existing portable, hand-held cut-off machines achieve cutting depths that are less than the maximum potential due to oversized flange diameters, which restrict the cutting depth to 20% less than the theoretical maximum for diamond cutting wheels of 300 mm and 16% less for 350 mm wheels, as per the standards EN ISO 19432:2012 and ANSI B175.4-2013.
Innovation Solution
The design optimizes the portable cut-off machine by ensuring the flange diameter corresponds to the minimum flange diameter, with the protective hood, supporting housing, and transmission device maintaining maximum distances from the output axis within half the minimum flange diameter, allowing for adjustable pivot positions to achieve the maximum cutting depth defined by the wheel diameter and flange diameter difference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the flange diameter is increased to meet safety standards, then the safety and structural stability are improved, but the cutting depth is reduced
Solution Approach 1:
The protective hood is made pivotable about a pivot axis that is offset from the output axis, allowing the hood to be dynamically repositioned. This enables the cutting machine to achieve maximum cutting depth by pivoting the hood away from the cutting path, while maintaining safety coverage when the hood is in its protective position. The dynamic repositioning resolves the contradiction between safety coverage and cutting depth achievement.
Solution Approach 2:
The solution introduces a new spatial dimension by offsetting the pivot axis from the output axis and making the protective hood pivotable. This allows the hood to move in an arcuate path, creating additional spatial arrangement options. The cutting components can be positioned in the angular range where the hood does not interfere with maximum cutting depth, effectively using three-dimensional spatial optimization to resolve the two-dimensional trade-off between safety coverage and cutting depth.
2Length of moving object
If the flange diameter is reduced to increase cutting depth, then the cutting depth is improved, but the structural stability and safety are worsened
Solution Approach 1:
The pivotable protective hood provides dynamic adaptability, allowing the system to achieve maximum cutting depth when needed while maintaining full safety coverage in protective positions. This dynamic reconfiguration enables the use of smaller flange diameters without compromising safety, as the hood can be positioned to provide coverage without interfering with the cutting path.
Solution Approach 2:
The invention changes the spatial parameters of the protective hood by introducing offset pivot axes and pivotable movement. This allows the hood to achieve different positional configurations, enabling the system to meet safety requirements with smaller flange diameters while still achieving maximum cutting depth through proper angular positioning of the cutting components.
3Reliability
If the protective hood is made fixed to ensure safety coverage, then the safety is improved, but the cutting depth is reduced due to interference with the cutting path
Solution Approach 1:
The protective hood is made pivotable rather than fixed, allowing it to dynamically reposition between safety coverage positions and cutting clearance positions. The hood can pivot about an offset axis to move out of the cutting path while maintaining safety coverage capability, resolving the contradiction between fixed safety coverage and cutting depth achievement.
Solution Approach 2:
The protective hood is functionally segmented into different operational zones through its pivotable design. One angular range provides safety coverage, while another angular range allows maximum cutting depth. The hood can be positioned in different segments of its rotational range depending on whether safety coverage or cutting performance is the primary requirement.
4Length of moving object
If the components are arranged closer to the output axis to increase cutting depth, then the cutting depth is improved, but the structural stability and safety coverage are worsened
Solution Approach 1:
The solution uses angular positioning as an additional dimension to resolve the radial positioning conflict. Components can be arranged at specific radial distances from the output axis, and the protective hood is positioned at specific angular ranges relative to these components. This two-dimensional spatial arrangement (radial distance + angular position) allows maximum cutting depth while maintaining safety coverage, overcoming the limitation of one-dimensional radial arrangement.
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3A~3B
AI summary
The invention relates to a portable, hand-guided abrasive cutting machine (10) comprising a rotating abrasive cutting disk, a supporting housing part (36), an output drive shaft, which is rotatably mounted about an output drive axis (40), a drive motor, a transmission device (19), which connects the drive motor to the output drive shaft, a flange, and a protective cover (24), which covers the abrasive cutting disk over a covering area. The abrasive driving disk is rotationally fixedly mounted on the output drive shaft by means of the flange and is surrounded by the protective cover (24), which is pivotable about a pivot axis. The protective hood (24), the supporting housing part (36), and the transmission device (19) have, over an outcut angle (θ), maximum distances from the output drive axis (40) which are less than or equal to half the diameter of the flange.