Cylinder Head Bolt Removal Template for Accurate Drilling
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Solution Overview
Problem
Conventional methods for removing broken bolts from cylinder heads, particularly in Ford 3.5L & 3.7L EcoBoost Engines, are inefficient and prone to damaging the bolt holes due to the lack of a guiding structure, leading to improper drilling angles and sizes, which complicates the removal process.
Innovation Solution
A template with aligned apertures is used to secure to the cylinder head, guiding a drill bit for precise removal of broken bolts by aligning with both broken and empty bolt holes, ensuring proper drill bit orientation and preventing lateral movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional unassisted drilling methods are used to remove broken bolts, then the removal process can be performed without additional tools, but the drilling accuracy deteriorates resulting in improper bore size, angle, or position
Solution Approach 1:
The patent introduces a template as an intermediary guiding device that mediates between the drill bit and the broken bolt. The template includes alignment features such as positioning pins that fit into reference holes in the cylinder head, and guide holes that direct the drill bit along the correct trajectory, thereby ensuring accurate bore placement without requiring complex measurement procedures
Solution Approach 2:
The template is prepared in advance with pre-defined alignment features and guide geometries specific to the cylinder head design. By performing the alignment and positioning work beforehand in the template fabrication stage, the actual bolt removal process becomes simpler while maintaining high precision, as the template already contains the correct bore locations and angles
2Manufacturing precision
If a template with alignment features is used to guide drilling, then drilling precision is improved, but the device complexity increases
Solution Approach 1:
The template is segmented into distinct functional zones: positioning features (pins or blocks) that align with reference holes, guide holes for drill bit trajectory, and mounting features for securing the template to the cylinder head. This segmentation allows each feature to be optimized independently while keeping the overall template design manageable and manufacturable
Solution Approach 2:
The template is designed as a universal tool that can accommodate multiple bolt removal operations on the same cylinder head. The template includes multiple guide holes corresponding to different bolt locations, and the positioning features align with standard reference holes in the cylinder head design, allowing the same template to guide drilling for various broken bolts without requiring custom templates for each location
3Productivity
If manual drilling without guidance is performed, then the equipment requirement is minimal, but the time required for accurate positioning increases
Solution Approach 1:
All positioning and alignment work is performed in advance during template fabrication. The template contains pre-positioned guide holes that correspond exactly to the required bore locations and angles. During actual bolt removal, the operator simply needs to attach the template to the cylinder head and insert the drill bit through the guide hole, eliminating time-consuming measurement and calculation steps
Data Source
AI summary
Embodiments of the apparatus relate to a template used to assist in the removal of broken bolts from an intake manifold mounting fasteners. The apparatus includes a template having a plurality of apertures. When the template is used with a cylinder head, one or more of the apertures is designated as an insertion aperture and one or more of the apertures is designated as a connection apertures. Insertion apertures align with bolt holes of the cylinder head containing broken bolts, and connection apertures align with empty bolt holes of the cylinder head that may be used to secure the template to the cylinder head. The template is used to guide a drill bit or other tools through the insertion apertures as the drill bit or other tool performs work to remove a broken bolt within the cylinder head.