Pipe Boring Feed Mechanism for Cutter Speed and Wear Control
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Solution Overview
Problem
Existing boring machines struggle with controlling the speed of the cutter during through-hole formation in fluid pipes, leading to potential wear and breakage due to excessive friction, as the contact condition is difficult to manage through manual handle operation.
Innovation Solution
A boring machine with a forward and backward moving operation mechanism that allows switching the feed amount of the cutter and shaft member in the axial direction based on the rotational amount of the handle, enabling control of the cutter's speed by manually adjusting the handle's operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the feed amount of the cutter is set to be large to move forward the cutter within the branch portion in a short time, then the productivity is improved, but the cutter may come into contact with the peripheral wall portion of the fluid pipe with excessive force causing wear and breakage
Solution Approach 1:
The patent applies dynamics by making the feed amount variable rather than fixed. The forward and backward moving operation mechanism allows the operator to dynamically adjust the feed amount based on real-time cutting conditions. When the cutter approaches the peripheral wall portion, the operator can reduce the feed amount to prevent excessive contact force, and increase it during non-contact phases to improve overall productivity.
2Productivity
If the cutter proceeds too fast when contacting the peripheral wall portion, then the productivity is improved, but the friction force increases excessively causing wear and breakage of the cutter
Solution Approach 1:
The patent applies parameter changes by allowing the feed amount parameter to be adjusted during operation. The forward and backward moving operation mechanism enables changing the feed amount parameter based on the contact condition between the cutter and peripheral wall portion. This dynamic parameter adjustment reduces friction force during contact phases while maintaining higher average proceeding speed for improved productivity.
3Productivity
If the feed amount is set to be large for fast cutting, then the productivity is improved, but it becomes difficult to properly control the proceeding speed of the cutter when contact condition changes
Solution Approach 1:
The patent resolves this contradiction by making the feed amount dynamic and controllable. The forward and backward moving operation mechanism provides the operator with direct control over the feed amount, enabling easy adjustment of proceeding speed in response to changing contact conditions. This dynamic control maintains both high productivity and ease of operation.
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 mechanism enables precise control of the cutter's speed, reducing friction and preventing wear or breakage by allowing for faster or slower advancement based on handle rotation, thus stabilizing the cutting process.
Implementation Method 1
a screw shaft (not shown) inserted through the inside of the shaft member rotates. In an inner periphery of the shaft member, a female screw corresponding to the screw shaft is cut. By rotation of the screw shaft, the cutter and the shaft member move relative to each other in an axial direction of the screw shaft
Data Source
AI summary
A boring machine for boring a part of a fluid pipe in an uninterrupted flow state, includes: a shaft member having a leading end to which a cutter is attached; a drive mechanism configured to rotate the cutter and the shaft member around the shaft of the shaft member; and a forward and backward moving operation mechanism configured to move the cutter and the shaft member forward and backward in the axial direction of the shaft member by a handle that is manually rotated. The forward and backward moving operation mechanism is further configured to switch a feed amount of the cutter and the shaft member in the axial direction between at least two different feed amounts according to a rotational amount of the handle.