Countersinking Tool Insertion Pin Centering and Depth Control
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Solution Overview
Problem
Existing countersinking tools often fail to achieve precise alignment and consistent depth in machining operations, leading to irregularities in the countersink or bore dimensions, particularly in applications like automotive and aerospace manufacturing where exact alignment is crucial.
Innovation Solution
A countersinking tool with an insertion pin featuring a reaming edge that widens the bore to the nominal diameter, ensuring precise alignment and rotational symmetry, combined with a tool aligning device for accurate depth control and angle adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an insertion pin is used to center and guide the countersinking tool in the bore, then the tool alignment is improved, but the machining precision deteriorates because the insertion pin cannot ensure exact alignment relative to the workpiece surface
Solution Approach 1:
The patent introduces a centering element with a conical centering portion that acts as an intermediary between the insertion pin and the workpiece bore. This conical centering portion is received in a corresponding conical recess in the workpiece, providing precise geometric alignment and ensuring that the countersinking tool is correctly positioned both axially and angularly relative to the workpiece surface.
Solution Approach 2:
The patent changes the geometric parameters of the insertion pin by adding a conical centering portion with a specific cone angle that matches the corresponding conical recess in the workpiece. This parameter change enables the insertion pin to provide both centering and angular alignment, transforming it from a simple positioning element to a precision alignment device.
2Manufacturing precision
If a stop device with a freely rotatable stop sleeve is used to control penetration depth, then the depth control is improved, but the overall device complexity increases
Solution Approach 1:
The patent combines multiple functions into the insertion pin: it serves as both a centering element (with the conical centering portion) and a depth control element (with the stop device). The stop sleeve can freely rotate on the insertion pin while the insertion pin itself provides both positioning and depth limitation, reducing the need for separate centering and stopping mechanisms.
Solution Approach 2:
The patent merges the centering function and the depth control function into a single integrated insertion pin assembly. The conical centering portion handles alignment while the stop sleeve with bearing handles depth control, both operating from the same tool structure without requiring additional separate devices.
3Manufacturing precision
If the insertion pin has a diameter corresponding to the nominal diameter of the bore, then the guidance precision is improved, but the ease of insertion deteriorates due to tight fit
Solution Approach 1:
The patent segments the insertion pin into two distinct functional portions: a conical centering portion at the tip for initial engagement and alignment, and a cylindrical portion with diameter corresponding to the nominal bore diameter for precise guidance. The conical portion facilitates easy insertion by gradually engaging the conical recess, while the cylindrical portion provides accurate centering once inserted.
Solution Approach 2:
The conical centering portion performs preliminary alignment and engagement action before the cylindrical portion engages the bore. This preliminary conical engagement prepares the path and ensures correct orientation, making the subsequent insertion of the full-diameter cylindrical portion easier and more precise.
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 solution enables the production of countersinks and bevels with high precision, ensuring consistent dimensions and accurate alignment, critical for streamlined workpiece surfaces in industries like automotive and aerospace.
Implementation Method 1
The reaming edge can be inserted into an unfinished bore with a diameter, which is smaller than a nominal diameter of the bore, in a cutting fashion
Implementation Method 2
a stop that features a bearing, by means of which a stop sleeve can rotate freely about the countersinking tool
Data Source
AI summary
A countersinking tool, comprising a tool shank and a tool head with multiple deburring or countersinking edges and an insertion pin. In some embodiments, the insertion pin features at least one reaming edge, on a radially outer side and extends over less than 33% of the overall length of the insertion pin, wherein the reaming edge can be inserted into an unfinished bore with a diameter, smaller than a nominal diameter of the bore, in a cutting fashion, wherein the reaming edge acts as a drill bit and is arranged on the insertion pin at a radius that corresponds to the radius of a nominal diameter of the bore, and wherein the insertion pin has the nominal diameter of the bore and can be guided in the bore without play.Also, a tool arrangement with a countersinking tool and to a method for producing a countersunk and/or deburred bore.