Ball Screw Nut Manufacturing via Flat Plate Bending
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Solution Overview
Problem
Existing ball screw devices face challenges in achieving adequate nut strength while maintaining high productivity, particularly in designs where the nut is thin and requires reinforcement due to manufacturing limitations.
Innovation Solution
A screw device manufacturing method involving the formation of loaded rolling-element grooves and return grooves in a flat plate, which is then bent into a ring to form the nut, ensuring adequate strength and stability through compression stress and unique groove shapes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the ball screw nut is formed by molding with a thin plate member to enable easy detachment from the mold, then productivity is improved, but the strength of the ball screw nut deteriorates
Solution Approach 1:
The invention changes the thickness parameter of the plate member from thin to thick, which enables the nut to achieve adequate strength while still being formed by molding. This parameter change resolves the contradiction by allowing the nut to be both easily detachable from the mold and sufficiently strong in operation.
2Strength
If the plate member is made thicker to increase nut strength, then strength is improved, but the ease of detachment from mold deteriorates
Solution Approach 1:
The invention changes the thickness parameter to enable adequate strength, and compensates for the reduced ease of detachment by optimizing the groove design and molding process. The grooves are specifically designed to facilitate detachment even with thicker plate members, thus resolving the contradiction between strength and ease of manufacture.
3Device complexity
If the loaded ball rolling groove is formed with less than one turn to reduce component count, then device complexity is reduced, but manufacturing precision deteriorates
Solution Approach 1:
The invention performs preliminary action by forming the grooves in a flat plate before bending it into a ring shape. This preliminary groove formation in the flat state allows for better manufacturing precision, and the subsequent bending process maintains the groove integrity, thus resolving the contradiction between reduced complexity and maintained precision.
4Strength
If the nut is formed by bending a flat plate into a ring to ensure adequate strength, then strength is improved, but the manufacturing process complexity increases
Solution Approach 1:
The invention performs preliminary groove formation in the flat plate before bending, which simplifies the overall manufacturing process. By preparing the grooves in the flat state where access is easier, the subsequent bending into a ring becomes a simpler operation, thus resolving the contradiction between strength improvement and process complexity.
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 method enhances nut strength, stabilizes groove dimensions, and increases productivity by allowing thicker plate formation and efficient plastic deformation, addressing the limitations of previous designs.
Implementation Method 1
bending the flat plate into a ring
Data Source
AI summary
A screw device manufacturing method ensures high productivity and adequate nut strength. The disclosed screw shaft manufacturing method includes: a groove forming step of forming a loaded ball rolling groove in a flat plate; and a nut forming step of bending the flat plate into a ring to form a nut. As the groove forming step of forming of the loaded ball rolling in the flat plate is followed by the nut forming step of bending the flat plate into a ring, sufficient strength of the nut can be easily achieved. Besides, a high compression stress is left in the loaded ball rolling groove in the inner surface of the nut.