Stud Bolt Recessed Rotation Stop to Prevent Burrs and Warpage
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Solution Overview
Problem
Conventional stud bolts cause metal deformation and burr formation when press-fitted into mounting plates, leading to quality issues such as damage to separate members and warpage, which can interfere with surrounding parts.
Innovation Solution
A stud bolt design featuring a non-perfect circular rotation stop portion, an annular groove, and an annular protrusion, with a recessed portion that guides the deformed metal into the groove, preventing burr formation and increasing detachment and free-spin torque by ensuring the metal enters the groove and recessed area, thus maintaining plate quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the rotation stop protrusion crushes the metal plate during press-fitting, then the detachment load and free-spin torque increase, but metal flows to the outer side radially causing burr formation and warpage
Solution Approach 1:
The rotation stop portion is divided into multiple functional zones: a crushing portion that deforms the metal plate, a recessed portion that captures flowing metal, and an annular groove that further contains the metal flow. This segmentation prevents uncontrolled radial flow that causes burrs while maintaining the necessary crushing action for high detachment load.
Solution Approach 2:
The recessed portion acts as an intermediary structure between the crushing portion and the outer periphery. It provides a controlled path for the crushed metal to flow into, preventing the metal from flowing directly to the outer side where it would form burrs. The recessed portion mediates the metal flow, converting harmful uncontrolled flow into controlled deformation within the recessed area.
2Force
If the rotation stop protrusion crushes the metal plate during press-fitting, then the free-spin torque increases, but the metal plate warps and interferes with surrounding parts
Solution Approach 1:
The rotation stop portion is segmented into a crushing portion for generating torque and a recessed portion for containing deformed metal. This segmentation allows the crushing action to generate high free-spin torque while the recessed portion simultaneously prevents warpage by capturing the flowing metal within its boundaries, preventing interference with surrounding parts.
Solution Approach 2:
The crushing of the metal plate, which initially causes harmful warpage, is converted into a beneficial effect. The recessed portion guides the crushed metal into a controlled deformation pattern that increases free-spin torque while the annular groove and recessed structure prevent uncontrolled warpage, transforming the harmful metal flow into a useful torque-generating mechanism.
3Strength
If metal flows to the outer side in the radial direction during press-fitting, then the detachment load increases, but burrs are generated that damage separate members
Solution Approach 1:
The rotation stop portion is segmented into a crushing portion that generates metal flow for high detachment load, and a recessed portion with annular groove that captures the flowing metal. This segmentation ensures that metal flows into the controlled recessed area rather than to the outer periphery, preventing burr formation that would damage separate members while maintaining high detachment load through the crushing action.
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 design effectively prevents burr generation, secures detachment load, and enhances free-spin torque while minimizing warpage, resulting in improved product quality and reduced interference with surrounding components.
Implementation Method 1
when the rotation stop portion crushes the mounting target plate, the mounting target plate that flows due to plastic deformation enters the recessed portion in addition to the annular groove
Data Source
AI summary
A stud bolt is provided that can improve the quality obtained when being fixed to a mounting target plate.[Means for Resolution]A stud bolt B to be fixed, in a retained state and a rotation stop state, to a mounting target plate T includes a head 1, a screw shaft portion 2, a rotation stop portion 3, an annular groove 21, and an annular protrusion 22. The mounting target plate T is to be sandwiched between a bearing surface 21 of the head 1 and the annular protrusion 22. A recessed portion 32 recessed toward an upstream side X2 in a screw advance direction is formed at the rotation stop portion 3.