Screw Fitting Control for High-Pressure Tightening Alignment
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Solution Overview
Problem
Existing screw member tightening and loosening apparatuses face challenges in suitably fitting the rotating body's fitting part to the screw member's fitted part due to high pressure contact during rotation, leading to difficulties in aligning and attaching the components.
Innovation Solution
A control unit manages a rotating body with a fitting part that repeats a predetermined shape at every angle, allowing for controlled alignment, pressing, and rotation in specific directions to facilitate separation and fitting, using a rotation-driving unit and movement unit to align, press, and rotate the rotating body in predetermined angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the rotating body is rotated at high speed to tighten the screw member, then the tightening efficiency is improved, but the fitting surfaces of the fitted part and fitting part come into contact with high pressure making it difficult to move the rotating body toward the screw member
Solution Approach 1:
The control unit performs preliminary alignment control before rotation, moving the rotating body toward the screw member at a position where the fitting surfaces do not contact each other. This preliminary positioning ensures that when rotation begins, the fitting part is already in the correct axial position, preventing high-pressure contact that would occur if alignment were attempted during rotation.
Solution Approach 2:
The fitting process is divided into distinct phases: alignment phase (where the rotating body is positioned axially without contact) and rotation phase (where tightening occurs). This segmentation allows each phase to be optimized independently - alignment without pressure contact, and rotation with high speed for efficiency.
2Reliability
If the rotating body is moved toward the screw member under high pressure to ensure fitting, then the fitting reliability is improved, but the rotation-driving unit cannot rotate the rotating body due to excessive contact pressure
Solution Approach 1:
The control unit executes preliminary alignment control to position the rotating body axially aligned with the screw member before rotation begins. During this alignment phase, the fitting surfaces are positioned to avoid contact, ensuring reliable alignment without applying excessive pressure that would prevent subsequent rotation.
Solution Approach 2:
The system dynamically transitions from a non-contact alignment state to a contact rotation state. The control unit manages the transition by first establishing axial alignment without pressure contact, then initiating rotation when the fitting part is properly positioned, allowing the system to adapt its interaction mode based on operational requirements.
Data Source
AI summary
A control unit is configured to perform a first control of controlling a movement unit so that a fitted part of a screw member and a fitting part of a rotating body are axially aligned with each other; a second control of controlling the movement unit to press the fitting part against the fitted part; a third control of, while maintaining a state in which the fitting part is pressed against the fitted part, controlling a rotation-driving unit to rotate the rotating body to a first rotation direction side by a first predetermined angle; a fourth control of, while maintaining the state in which the fitting part is pressed against the fitted part, controlling the rotation-driving unit to rotate the rotating body to a second rotation direction side by a second predetermined angle, which is smaller than the first predetermined angle, the fourth control performed after the third control.