Scroll Vacuum Pump Spiral Walls for Spring-Back Compensation
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Solution Overview
Problem
The manufacturing of scroll vacuum pump components, particularly the spiral walls, is challenging due to spring-back effects during machining, leading to dimensional instability and increased production time and costs, as existing correction algorithms cannot account for these effects, necessitating manual interventions.
Innovation Solution
The spiral walls are produced with reduced thickness or recesses at the free end sections to prevent spring-back, allowing for automatic correction of machining settings and improved dimensional stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the spiral walls are produced by chip-forming machining with a rotating end mill cutter pressed against the spiral wall, then the spiral walls can be manufactured, but the spiral walls deflect due to elastic deformability causing spring-back effects that lead to dimensional instability and exceed production tolerances
Solution Approach 1:
The patent applies preliminary action by reducing the thickness of the free end sections of spiral walls before the final machining operation. This pre-thinning compensates for the expected spring-back effect during machining, ensuring that after the elastic recovery, the spiral wall remains within the required production tolerances. The reduction in thickness is calculated in advance based on the material's elastic properties and machining forces.
Solution Approach 2:
The patent changes the physical parameter of the spiral wall thickness at specific locations (free end sections) to address the spring-back problem. By locally reducing the thickness parameter, the structural rigidity at these critical sections is adjusted to minimize elastic deformation during machining, thereby maintaining dimensional stability without affecting the overall functionality of the spiral component.
2Manufacturing precision
If correction algorithms are used to adjust machining settings based on measurement results, then manufacturing accuracy can be improved, but existing algorithms cannot account for spring-back effects requiring manual interventions
Solution Approach 1:
The patent incorporates spring-back compensation directly into the machining program as a preliminary correction factor. Instead of using complex post-machining measurement and adjustment algorithms, the spring-back effect is calculated in advance and the machining parameters are pre-adjusted to compensate for it. This eliminates the need for complex iterative correction systems and manual interventions.
Solution Approach 2:
The patent skips the complex iterative measurement-correction-remeasurement cycle by implementing a one-time pre-calculated spring-back compensation in the machining program. This approach rushes through the correction process in a single machining operation rather than requiring multiple measurement and adjustment cycles, thereby simplifying the correction system.
3Manufacturing precision
If manual interventions are used to evaluate correction measurements and adjust machining settings, then dimensional stability can be maintained, but production time and costs increase
Solution Approach 1:
The patent implements self-service by automatically compensating for spring-back effects through pre-calculated corrections in the machining program. The system serves itself by having the control program automatically adjust machining parameters based on pre-determined spring-back compensation values, eliminating the need for manual evaluation and adjustment of each workpiece.
Solution Approach 2:
The patent changes the machining parameters in the control program to account for spring-back effects. By modifying the tool path parameters and cutting depths based on pre-calculated spring-back compensation, the system automatically maintains dimensional stability without requiring manual intervention, thereby preserving production speed.
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 approach simplifies and speeds up the manufacturing process by enabling automatic interpretation of measurement results and reduces the need for manual interventions, enhancing cost-effectiveness and precision.
Implementation Method 1
a drive shaft (17) that rotates about an axis of rotation (15) during operation and that has an elastic section (19) for driving the movable spiral component (13)
Data Source
AI summary
A scroll vacuum pump includes a pump system having a stationary spiral component and a movable spiral component cooperating with the stationary spiral component in a pump-active manner, a drive shaft that rotates about an axis of rotation during operation and that has an eccentric section for driving the movable spiral component, and an electric drive motor for the drive shaft. The movable spiral component includes a spiral arrangement, which has spiral walls, spiral grooves bounded by the spiral walls and a spiral base forming the base of the spiral grooves, and a support for the spiral arrangement. The support cooperates with the eccentric section of the drive shaft. The stationary spiral component includes a spiral arrangement, which has spiral walls and a spiral base, and a support for the spiral arrangement.