Eccentric Boring Bar with Dense Balance Element for Precise Hole Machining
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Solution Overview
Problem
Existing boring bars face challenges in efficiently machining multiple holes separated by a given spacing distance due to the difficulty in supporting the tool during the machining process, especially when the holes are rough and unmachined, which can lead to imprecise cutting and potential damage to the hole surface.
Innovation Solution
A cutting tool design featuring a main body with a balance element and guide elements, where the balance element is made of a denser material than the basic body, allowing for controlled deformation and precise cutting edge alignment, enabling eccentric guidance and support within a guide hole, thus ensuring precise machining without radial shift during the cutting process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a line boring bar with multiple blades is used to machine multiple holes simultaneously, then productivity is improved, but the tool becomes difficult to support and guide accurately through rough unmachined holes
Solution Approach 1:
The boring bar is segmented into a basic body and a separate balance element, allowing independent optimization of each component. The balance element can be specifically designed for balancing without affecting the basic structural integrity and guidance capabilities of the main body.
Solution Approach 2:
A balance element made of dense material (e.g., tungsten) is attached to the basic body to counterbalance the weight distribution. This creates a balanced tool that can be accurately supported and guided through rough holes while maintaining the capability to machine multiple holes simultaneously.
2Stability of the object's composition
If the balance element is made of dense material to compensate for imbalance, then rotational balance is improved, but the deformation behavior becomes unpredictable affecting cutting precision
Solution Approach 1:
The material density parameter of the balance element is specifically selected (e.g., tungsten with high density) to achieve optimal balance compensation. The density is high enough to provide effective balancing but the overall design ensures controlled deformation characteristics.
Solution Approach 2:
The boring bar combines the basic body material (e.g., steel) with a balance element material (e.g., tungsten) to create a composite structure. This allows the balance element to provide rotational stability while the overall composite structure maintains predictable deformation behavior for precise cutting.
3Reliability
If guide elements are added to support the boring bar, then tool stability is improved, but the device complexity increases
Solution Approach 1:
The balance element serves multiple functions: it compensates for rotational imbalance, provides structural support, and contributes to overall tool stability. This multi-functionality reduces the need for additional separate guide elements, thereby limiting the increase in device complexity.
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 cutting tool achieves precise and efficient machining of multiple holes by maintaining concentricity and preventing radial shift of the cutting edge, ensuring accurate hole dimensions and reducing vibration, thereby enhancing machining precision and tool stability.
Implementation Method 1
the balance element and the basic body are typically produced from different materials or substances, and wherein the balance element is typically produced from a material with a greater density than the basic body
Implementation Method 2
The special design of the balance element and the basic body described below ensures that the deformation arising in use of the cutting tool presented here causes a cutting edge of a blade of the cutting tool, viewed in a cross-section, to shift essentially in a direction perpendicular to a midplane
Implementation Method 3
the guide elements are separated from the axis of rotation by a guide radius. The main body is furthermore divided into a functional region and an eccentric region, wherein the cutting elements as well as the guide elements are distributed about the main body over an angular range of less than 180°
Data Source
AI summary
The present application relates to a cutting tool (2), in particular a boring bar (2) for machining holes (16) separated from each other in an axial direction (4) by a given spacing distance (a), comprising a main body (10) extending in an axial direction (4) with an axis of rotation (R) with at least one cutting element (12), as well as with a number of guide elements (14) for guiding the main body (10) within a guide hole (16A), wherein the guide elements (14) for the axis of rotation (R) are separated by a guide radius (r1), wherein viewed in a cross-section, the main body (10) is divided into a functional region (19) and an eccentric region (20), wherein the cutting elements (12) and the guide elements (14) are arranged distributed over the circumference of the main body (10) over an angular region (α) of less than 180°.