Helical Drill Adjustment Surface for Variable-Length Chamfering
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Solution Overview
Problem
Existing drilling/chamfering tools have limited length adjustment capabilities due to adjustment surfaces oriented parallel to the longitudinal direction, restricting the range of variable length adjustments and requiring low twist angles for sufficient axial adjustment.
Innovation Solution
A drilling/chamfering tool with a drill featuring helically extending grooves and partially flattened drill backs forming a helical adjustment surface, allowing for a longer adjustment range and enabling larger twist angles for grooves while maintaining sufficient axial adjustment, along with a clamping sleeve design that includes a guide element for forced guidance during length adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the adjustment surface extends in parallel to the longitudinal direction, then the structure is simple, but the length adjustment range is limited
Solution Approach 1:
The adjustment surface is transformed from a linear arrangement (parallel to longitudinal direction) to a helical arrangement (adding rotational dimension). This dimensional change allows the adjustment surface to extend over a longer path while maintaining compact axial length, thereby increasing the length adjustment range without significantly increasing device complexity
Solution Approach 2:
The adjustment surface is made rotatable relative to the drill shaft, transforming a static linear adjustment mechanism into a dynamic helical adjustment mechanism. This allows the cutting insert to be positioned at multiple locations along the helical path, expanding the effective adjustment range
2Productivity
If low twist angles are used for grooves, then sufficient axial adjustment is possible, but chip transport efficiency decreases
Solution Approach 1:
The adjustment mechanism utilizes the helical dimension of the grooves themselves rather than relying on low twist angles. By positioning the adjustable cutting insert to engage with the helical groove structure, sufficient axial adjustment is achieved through the helical path while maintaining conventional twist angles for efficient chip transport
Solution Approach 2:
The helical grooves serve dual functions: they maintain their primary function of chip transport with conventional twist angles, and simultaneously provide the secondary function of enabling axial adjustment through the helical path. This multi-functionality resolves the contradiction between chip transport efficiency and adjustment range
Data Source
AI summary
The combination tool (2), in particular a drilling/chamfering tool, comprises a drill (6) extending in the longitudinal direction (4) with a clamping sleeve (8), which is designed to receive the drill (6) and fasten the drill (6) at a variable length and which has a holding seat (38) for a cutting insert (12). The drill (6) comprises a cutting region (22) provided with grooves (14), wherein the grooves (14) extend helically and are formed between two grooves (14) drill backs (18). At least one of the drill backs (18) is partially flattened to form an adjustment surface (16) for the cutting insert (12), wherein the adjustment surface (16) extends helically. As a result, a length adjustment over a large length range is made possible independently of the twist angle (γ).