Chamfered Shaft Support for Accurate Male Screw Rolling
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Solution Overview
Problem
The existing methods for manufacturing male screw portions on shafts often result in deformation and increased manufacturing costs due to the formation of recessed holes and subsequent burrs or protrusions, which affect the accuracy and smooth operation of feed screw mechanisms.
Innovation Solution
A shaft member design with chamfered portions that include supported surface portions inclined radially outward, allowing for rolling processing without forming recessed holes, and a method of supporting the shaft during processing to prevent deformation and reduce excess material formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If recessed holes are formed in axial end surfaces to position material during rolling processing, then positioning accuracy is improved, but manufacturing complexity and post-processing requirements increase
Solution Approach 1:
The chamfered portion is formed in advance on the shaft member before rolling processing, creating a supported surface that enables accurate positioning during subsequent operations without requiring post-processing removal of excess material
Solution Approach 2:
The invention extracts the positioning function from the axial end surfaces (by not forming recessed holes there) and relocates it to the chamfered portions with supported surfaces, eliminating the need for recessed holes and subsequent cutting operations
2Shape
If axial end portions are cut and removed after rolling to eliminate recessed holes, then surface quality is improved, but male screw portion accuracy deteriorates due to deformation
Solution Approach 1:
The chamfered portion with supported surface is formed beforehand to enable accurate positioning during rolling, ensuring high male screw portion accuracy from the start and eliminating the need for subsequent cutting operations that would cause deformation
3Stability of the object's composition
If material is strongly pressed against jig during rolling processing, then positioning stability is improved, but burr and protrusion formation increases
Solution Approach 1:
The supported surface on the chamfered portion provides a localized, optimized contact area with the jig, distributing pressure evenly and enabling strong pressing for positioning stability without causing burr and protrusion formation at the axial end edges
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 prevents deformation of the male screw portion and reduces manufacturing costs by eliminating the need for post-processing removal of excess material, ensuring high shape accuracy and smooth operation of the feed screw mechanism.
Implementation Method 1
the shaft member is positioned in a radial direction by pressing at least an axially intermediate portion of the supported surface portion of the shaft member against a tapered surface provided on a jig
Implementation Method 2
a male shaft is manufactured by rolling-processing a shaft member
Data Source
AI summary
A shaft member includes: an outer peripheral surface; at least one axial side surface facing an axial direction; a chamfered portion formed at a connection portion between an axial end edge of the outer peripheral surface and an outer peripheral edge of the axial side surface; and a processing target portion formed on at least a part of the outer peripheral surface. The chamfered portion includes at least one supported surface portion disposed at an axially intermediate portion of the chamfered portion and inclined radially outward as approaching the processing target portion in the axial direction. The axial end edge of the outer peripheral surface and the outer peripheral edge of the axial side surface are located radially inward than a tangent line at an axially intermediate portion of the supported surface portion, in a cross section in the axial direction.