Orbital Forging Structure for Large-Angle Crimp Forming
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Solution Overview
Problem
Conventional orbital forging devices are large and costly due to the need for a thrust sliding bearing with a partially spherical sliding surface, and setting a swing angle of the molding die to 15 degrees or more increases the device size and manufacturing cost, making it difficult to form crimped portions efficiently.
Innovation Solution
The orbital forging device features a driving mechanism that prevents movement of the swinging shaft toward the frame, eliminating the need for a thrust sliding bearing and allowing a larger swing angle of the molding die from 15 to 30 degrees, using a rotating body with a rolling bearing to support the swinging shaft and maintain stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thrust sliding bearing with a partially spherical sliding surface is used to support the swinging shaft, then the device can maintain stability during orbital forging, but the device size and manufacturing cost increase significantly
Solution Approach 1:
The invention extracts and eliminates the thrust sliding bearing from the orbital forging device. By providing a driving mechanism that directly prevents movement of the swinging shaft toward the frame, the complex thrust sliding bearing with partially spherical sliding surface is removed entirely, reducing device size and manufacturing cost while maintaining stability
Solution Approach 2:
The driving mechanism is designed to perform multiple functions: it both drives the orbital forging process and prevents movement of the swinging shaft toward the frame. This multi-functionality eliminates the need for separate thrust bearing components, simplifying the overall device structure
2Productivity
If the swing angle of the molding die is increased to 15 degrees or more to improve forging efficiency, then crimped portions can be formed more efficiently, but the device size and manufacturing cost increase
Solution Approach 1:
The invention enables a larger swing angle of 15 to 30 degrees for the molding die, which improves orbital forging efficiency. The driving mechanism is specifically designed to accommodate and control this dynamic movement, allowing the swinging shaft to achieve the necessary arc motion for effective crimped portion formation without requiring oversized device components
3Device complexity
If the swing angle of the molding die is set to a small value to reduce device size, then manufacturing cost decreases, but it becomes difficult to form crimped portions with sufficient force
Solution Approach 1:
The invention optimizes the swing angle parameter to a specific range of 15 to 30 degrees, which is larger than conventional small angles. This parameter change enables the molding die to apply sufficient axial and radial outward load to the cylindrical section for effective plastic deformation, while the driving mechanism controls the motion to maintain manageable device dimensions
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 design reduces the size and manufacturing cost of the orbital forging device while enabling efficient formation of crimped portions with controlled machining loads, suppressing deformation of the inner ring and maintaining preload stability in hub unit bearings.
Implementation Method 1
a rolling bearing to support the swinging shaft and prevent movement of the swinging shaft toward the frame
Implementation Method 2
the inner end section in the axial direction of the cylindrical section 8 which is provided in the inner end section in the axial direction of the hub body 6 is plastically deformed outward in the radial direction so as to form a crimped portion 9
Implementation Method 3
the molding die 15 rotates around its center axis 8 based on the friction force that acts on the contact portion thereof with the inner end section in the axial direction of the cylindrical section
Data Source
AI summary
Provided is construction which is able to downsize an orbital forging device comprising a spherical seat with shaft that swings and rotates with a molding die. The end section on the other side in the axial direction of the swinging shaft 13 is supported with respect to the driving mechanism 17 in a state where the movement toward one side in the axial direction (lower side) is prevented, and a member for preventing the swinging shaft 13 from moving toward the one side in the axial direction with respect to the frame 10 is not assembled in a section which is located between the convex spherical seat 14 and the driving mechanism 17 in the axial direction of the swinging shaft 13.