Helical Notch Nut Structure for Coating Film Peeling During Tightening
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for peeling coating films from male screw components during assembly hinder complete fastening due to the film adhering to the nut's bearing surface, reducing productivity and complicating welding processes.
Innovation Solution
A coating film peeling nut with a helically formed notch on its inner surface, oriented differently from the female screw's lead angle, directs the peeled film away from the bearing surface, allowing for effective discharge and preventing interference with fastening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coating film is thickened on male screw components to improve rust prevention, then corrosion resistance is improved, but the coating film adheres to the nut during assembly preventing proper tightening
Solution Approach 1:
The nut's inner surface is segmented into multiple functional zones: a coating film peeling portion with oblique notches for removing coating, a bearing surface for fastening, and a discharge space for ejecting peeled coating. This segmentation allows the nut to simultaneously handle coating removal and fastening functions without interference.
Solution Approach 2:
The harmful coating film is extracted from the fastening interface by the peeling portion before the coating contacts the bearing surface. The discharged space then extracts the peeled coating from the assembly path, preventing it from interfering with complete fastening.
2Object-affected harmful factors
If masking tape or insulating film is applied to prevent coating adhesion, then coating film adhesion is prevented, but additional operations for removing masking tape or peeling coating are required reducing productivity
Solution Approach 1:
The nut performs self-service by automatically peeling off the coating film during the tightening operation itself. The oblique notches on the coating film peeling portion actively remove coating as the nut threads onto the male screw component, eliminating the need for separate masking or post-coating removal operations.
Solution Approach 2:
The coating film peeling function is merged with the fastening function in a single integrated nut structure. The peeling portion and bearing surface work together in one component, allowing coating removal and fastening to occur simultaneously during a single tightening operation.
3Object-affected harmful factors
If a conventional nut with axial notch is used to peel coating film, then coating film peeling is achieved, but the peeled coating film falls onto the bearing surface preventing complete fastening
Solution Approach 1:
The notch orientation is changed from axial (parallel to screw axis) to oblique (at an angle to screw axis). This dimensional change in notch orientation creates a discharge space that directs peeled coating away from the bearing surface in a different spatial direction, preventing coating accumulation on the fastening surface.
Solution Approach 2:
Instead of allowing peeled coating to fall downward onto the bearing surface as in conventional designs, the oblique notch configuration inverts the discharge path, directing coating upward or laterally away from the bearing surface through the discharged space.
Data Source
AI summary
The coating film peeling nut of the present invention has a notch 13 formed in an inner surface of a nut main body 10 on which a female screw 12 is formed, the notch 13 extending in a direction different from that of a lead angle of the female screw 12. The notch 13 is formed helically, and a winding direction thereof is the same as that of the female screw 12. A pitch of the notch 13 is 2 to 10 times a pitch of the female screw 12, and a depth of the notch 13 is 20 to 80% of a thread height of the female screw 12.