Rivet Nut Die Structure for Direct Oblique Tooth Forming
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Solution Overview
Problem
Conventional nut molding machines struggle to directly form oblique teeth on rivet nuts without damaging the die structure, necessitating a secondary process like knurling, which complicates the production and reduces yield.
Innovation Solution
A molding die structure comprising a mold seat, a first forging die with an oblique shoulder, a second forging die with an oblique toothed portion, and a retaining member, allowing for direct formation of oblique teeth on the rivet nut flange during the molding process without damaging the dies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional nut molding machine uses a conventional die structure to forge the rivet nut, then the rivet nut can be formed, but the oblique teeth cannot be stripped from the die structure without damaging the rivet nut or die structure
Solution Approach 1:
The die structure is divided into two separate forging dies: a first forging die with a die cavity and an oblique shoulder, and a second forging die with an oblique toothed portion. This segmentation allows the oblique teeth to be formed on the flange while enabling easy removal without damage, as each die component has a specific function and the low friction contact facilitates stripping.
Solution Approach 2:
The patent introduces a dynamic element by allowing the second forging die to rotate during the forging process. The rotation of the second forging die enables the oblique teeth to be formed at different angles and facilitates easy removal from the flange without damaging either the rivet nut or the die structure, as the rotating action reduces friction and prevents sticking.
2Productivity
If oblique teeth are directly formed on the flange during the working process, then production efficiency is improved, but the die structure becomes more complex
Solution Approach 1:
The patent merges the formation of oblique teeth with the existing forging process by integrating the oblique toothed portion into the second forging die that is already part of the conventional nut molding machine. This allows direct formation of oblique teeth during the working process without adding a separate secondary working process, thereby improving production efficiency while keeping the die structure complexity manageable.
Solution Approach 2:
The second forging die serves multiple functions: it forms the oblique teeth on the flange, allows for easy removal of the teeth without damage, and can rotate to accommodate different forging angles. This multi-functionality reduces the need for additional specialized components, thereby improving productivity without proportionally increasing device complexity.
3Manufacturing precision
If a secondary working process like knurling is used to form oblique teeth, then the oblique teeth can be formed, but the working procedure is complicated and yield decreases
Solution Approach 1:
The patent combines the oblique tooth formation process with the primary forging process by integrating the oblique toothed portion into the second forging die. This eliminates the need for a separate secondary working process like knurling, thereby simplifying the working procedure and increasing the yield of rivet nuts by reducing additional processing steps and potential damage points.
Solution Approach 2:
The oblique toothed portion is pre-formed on the second forging die before the forging process. This preliminary preparation allows the oblique teeth to be directly imprinted onto the flange during the normal forging operation, eliminating the need for subsequent secondary processes and improving overall productivity and yield.
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
This solution enables the direct formation of oblique teeth on rivet nut flanges without a secondary process, simplifying the production procedure, reducing time, and significantly increasing yield by facilitating a low-friction contact between the dies.
Implementation Method 1
The second forging die and the die cavity of the first forging die form a low friction contact
Data Source
AI summary
A molding die structure for forming oblique teeth on a rivet nut includes a mold seat, a first forging die, a second forging die, and a retaining member. The mold seat is provided with a mold cavity and a threaded portion. The first forging die is inserted into the mold cavity and provided with a die cavity and a nut cavity. The second forging die is inserted into the die cavity and has an inner face provided with an oblique toothed portion and a guide hole. The oblique toothed portion includes a plurality of oblique teeth. The retaining member is screwed into the threaded portion and limits the first forging die and the second forging die in the mold cavity. The second forging die and the die cavity of the first forging die form a low friction contact.