Tubular Body Cutting with Accompanying Roller Pressure Stabilization
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Solution Overview
Problem
Existing transversal cutting equipment for tubular bodies requires precise alignment of multiple rotating parts, struggles with maintaining cut pressure distribution, and is inefficient in producing short pieces.
Innovation Solution
An apparatus with a base frame, parallel cylinders, and a movable cutting head with a circular saw blade and accompanying roller, where the blade and roller movements are coordinated by an elastic or constant-force member, allowing easier alignment and more even cut pressure, enabling cutting into short pieces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional end mill is used to cut tubular bodies, then the cutting process is simple, but the cutting edges break easily due to high compressive forces and radial thrust
Solution Approach 1:
The cutting tool is divided into multiple segments: a body portion and a separate insert portion with cutting edges. This segmentation allows the cutting edges to be replaced independently without replacing the entire tool, addressing the reliability issue while maintaining process simplicity.
Solution Approach 2:
The patent changes the geometric parameters of the cutting edges by forming them at angles between 45-60 degrees relative to the longitudinal axis, and by creating a chamfered configuration. These parameter changes improve the strength and durability of the cutting edges against breakage from compressive forces and radial thrust.
2Reliability
If the cutting edges are made stronger to prevent breakage, then the reliability improves, but the device complexity increases
Solution Approach 1:
By segmenting the tool into a body and replaceable inserts, the patent achieves stronger, more durable cutting edges without increasing overall device complexity. The modular design allows simple replacement of worn inserts rather than redesigning the entire tool structure.
Solution Approach 2:
The cutting edges are pre-formed on separate inserts before assembly to the tool body. This preliminary formation allows optimization of edge geometry and strength without complicating the overall tool structure, as the inserts can be manufactured and prepared in advance.
3Reliability
If the cutting edges are angled to reduce radial thrust, then the reliability improves, but the manufacturing precision requirements increase
Solution Approach 1:
The cutting edges are formed at the required angles (45-60 degrees) during the manufacturing of the inserts, which are then assembled to the tool body. This preliminary formation at controlled manufacturing stages ensures consistent angular precision without requiring complex precision operations on the final assembled tool.
Solution Approach 2:
By specifying a range of angles (45-60 degrees) rather than a single precise value, and by creating a chamfered configuration, the patent achieves adequate performance while reducing the stringency of manufacturing precision requirements. The chamfering process itself becomes part of the standard manufacturing sequence.
Data Source
Figure 1
Figure 2A~2B
Figure 2C~2D
AI summary
An apparatus (100) for transversally cutting a tubular body (1) of thickness (t) comprises a base frame (2) on which two parallel cylinders (10) are mounted horizontally and arranged to be rotatably actuated in a same rotation direction, thus forming a cradle (17) arranged to support and to rotate the tubular body (1). A cutting head (31) is arranged above the cradle (17), including a movable support (35) that is arranged to be brought closer to or further away from the cradle (17), and that supports a rotatable circular blade (32) arranged to cut the thickness (t) of the rotatable tubular body (1) while being brought closer to the cradle (17). In order to stabilise the tubular body (1) on the cradle (17), an idler accompanying or positioning roller (40) is arranged between the cradle (10) and the rotation axis (33) of the blade (32), said roller (40) rotatably mounted to an arm (42) that is movably connected to the movable support (35) via an elastic or constant-force member (44) in such a way that, when the cutting head (31) is lowered towards the cradle (17), the roller (40) comes into contact with the surface of the tubular body (1) and then remains in that position while the blade (32) continues to be lowered towards the tubular body (1) and finally attains and cuts the tubular body (1), moving to a position (B), in which the distance (D2) of the accompanying roller (40) from the cradle (17) is shorter than the distance (D2) of the blade (32) from the cradle (17) by a predetermined amount (d) that is at least equal to the thickness (t) of the tubular body (1).