Pipe Boring Machine With Variable Feed for Cutter 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 faster or slower progression by switching between at least two different feed amounts.
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 excessive contact with the peripheral wall portion 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 switch between a first feed amount and a second feed amount (which is smaller than the first) based on the cutting conditions. This dynamic adjustment enables high productivity when the cutter is not in contact with the pipe wall, and switches to a smaller feed amount when contact is detected, preventing excessive friction and cutter wear.
2Ease of operation
If the cutter is manually advanced by rotating the handle, then the ease of operation is maintained, but the manufacturing precision of the through-hole is difficult to control due to changing contact conditions
Solution Approach 1:
The patent implements feedback by allowing the operator to sense changes in resistance during manual handle rotation and switch between different feed amounts accordingly. When the cutter contacts the peripheral wall portion, the resistance increases, and the operator can detect this change and switch to the smaller second feed amount to maintain precise control and prevent excessive friction, thereby ensuring through-hole quality while maintaining ease of manual 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
Facilitates precise control of the cutter's speed, reducing friction and preventing wear or breakage by adjusting the feed amount manually, while maintaining an uninterrupted fluid flow.
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.