Segmented Thread Cutting to Prevent Chip Entanglement
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Solution Overview
Problem
Conventional threading devices and methods face issues with long chip entanglement and surface damage when forming long threads, as continuous turning generates lengthy chips that can entangle with the tool or damage the workpiece surface.
Innovation Solution
A threading device and method that control the movement of a tool relative to a workpiece using a spindle and control unit, performing turning steps with predetermined cutting depths and radial rounding-up, shifting axial positions for each step to form a thread groove while keeping machining lengths shorter than conventional methods, and incorporating a deburring process to remove top thread burrs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If continuous turning is performed over the entire axial range to form long threads, then threading completeness is improved, but chip length increases causing entanglement and surface damage
Solution Approach 1:
The continuous turning process is divided into multiple discrete turning steps, each covering only a portion of the axial range. The tool performs turning operations sequentially on different axial segments, with each step generating shorter chips that are easily evacuated, thereby preventing chip entanglement and surface damage while completing the full thread length
Solution Approach 2:
The turning operation is executed periodically with alternating phases: a turning step that cuts the workpiece over a limited axial range, followed by a rounding-up step that moves the tool radially outward. This periodic cycle repeats across multiple passes, progressively forming the complete thread while continuously breaking chips into manageable segments
2Manufacturing precision
If multiple repeated turning operations are performed to form long threads, then threading depth is improved, but chip length increases causing entanglement
Solution Approach 1:
Each turning operation is segmented to cover only a specific axial portion rather than the entire thread length. Multiple such segmented turning steps are executed in sequence, with each step producing short chips that are easily removed, thereby achieving deep threading without long chip entanglement
Solution Approach 2:
The tool path is designed to move not only axially but also radially outward during the rounding-up phase. This dimensional change allows the tool to clear chips effectively by moving away from the cutting zone, preventing chip entanglement while maintaining progressive threading depth
Data Source
AI summary
Disclosed are threading device and threading method, including a turning step for threading a rotating workpiece with a predetermined cutting depth, by relatively moving a tool in the axial direction of the workpiece and then rounding-up the workpiece obliquely by relatively moving the tool in the axial direction and radially outward. The workpiece is subjected to the threading process by repeatedly carrying out the turning step while sequentially shifting the axial position for starting the rounding-up of the workpiece relative to an axial position where the rounding-up of the workpiece has been started in a previous turning step.