Ball Screw Nut Laminate Structure for Lower-Cost Hydraulic Forming
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Solution Overview
Problem
The high cost of manufacturing machine components with complex shapes using hydraulic forming methods, due to the increased cost of forming dies and the complexity of shaping processes.
Innovation Solution
A ball screw device and manufacturing method that utilize a laminate body forming die with laminated plates, allowing for the cost-effective production of machine components by plastically deforming tubular materials using hydraulic pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a hydraulic forming method is used to manufacture machine components with complex shapes, then the manufacturing capability for complex shapes is improved, but the manufacturing cost increases due to the increased cost of forming dies
Solution Approach 1:
The forming die is divided into multiple plates that can be laminated together. This segmentation allows each plate to be manufactured separately at lower cost, and only the necessary number of plates are assembled to create the complex three-dimensional forming surface, reducing the overall cost of the forming die while maintaining the ability to form complex shapes
Solution Approach 2:
Multiple plates are laminated together in a nested configuration to build up the complex forming die structure. This nesting approach allows the complex three-dimensional shape to be constructed from simpler two-dimensional plates, reducing the manufacturing cost of each individual component while achieving the desired complex overall shape
2Shape
If a hydraulic forming method is used to manufacture machine components with complex shapes, then the manufacturing capability for complex shapes is improved, but the complexity of shaping processes increases
Solution Approach 1:
The forming process is segmented into multiple pressing operations, each corresponding to a specific plate in the laminate body. This segmentation simplifies the overall complex shaping process by breaking it down into manageable steps, where each step can be controlled and optimized independently, reducing the overall process complexity while achieving complex final shapes
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 method reduces manufacturing costs by simplifying the formation of the forming die and enabling efficient shaping of complex components, while maintaining the accuracy and durability required for machine components.
Implementation Method 1
a hydraulic pressure is applied to the inner peripheral surface of the tubular material so that the tubular material is plastically deformed radially outward
Implementation Method 2
the tubular material is plastically deformed radially outward until the tubular material has a shape along the forming peripheral surface
Data Source
AI summary
A ball screw device includes a nut (3), a screw shaft, and a plurality of balls arranged between the nut (3) and the screw shaft. The nut (3) includes a first member (11) disposed to surround the screw shaft, a second member (10) disposed between the screw shaft and the first member (11), and a third member (12) disposed between the first member (11) and the second member (10). The third member (12) includes a laminate body (12A) having a plurality of plates (22a, 22b) laminated in an axial direction. The laminate body (12A) includes an inner surface facing an outer surface of the second member (10). The inner surface of the laminate body (12A) has a shape corresponding to a shape of the outer surface of the second member (10).