Conical Wedge Centering for Rotary Die Positioning
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Solution Overview
Problem
Traditional centering devices for rotary cutting dies in molds lack precision and repeatability due to clearance between guide elements, leading to misalignments and inaccuracies in lamination stacking, especially when handling large numbers of laminations for electric motor production.
Innovation Solution
A centering device with wedge-like elements and conical cavities on the sleeve provides a clearance-free conical coupling to lock the die in precise angular positions, ensuring accurate alignment and minimizing wear, using a cam-driven mechanism to engage and disengage the wedge-like element with the sleeve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional guide devices with clearance between pilot column and centering bush are used, then the device complexity is reduced and ease of manufacture is improved, but the manufacturing precision and positioning accuracy deteriorate due to clearance causing misalignment
Solution Approach 1:
The patent employs a conical wedge element that engages with a corresponding conical cavity in the centering bush. This conical geometry provides self-centering action and eliminates clearance between the pilot column and centering bush, ensuring precise and repeatable positioning of the die relative to the punch without requiring complex adjustment mechanisms
Solution Approach 2:
The wedge element acts as an intermediary between the pilot column and the centering bush. It fills the clearance gap and transmits positioning forces accurately, mediating the interaction between the moving and stationary parts to achieve precise alignment while maintaining a relatively simple device structure
2Reliability
If traditional centering devices with clearance are used, then the ease of operation is improved, but the reliability deteriorates due to non-repetitive die positioning causing wear and inaccuracies
Solution Approach 1:
The conical geometry of the wedge element and cavity provides automatic self-centering and repeatable positioning. Each time the die is rotated to a new angular position, the conical wedge ensures consistent engagement without clearance, achieving high positioning repeatability while requiring minimal operational intervention
Solution Approach 2:
The centering device with conical wedge performs preliminary positioning action before the cutting operation begins. The wedge element pre-loads the pilot column and centering bush into precise alignment, ensuring that subsequent cutting operations start from a known, accurate position, thereby improving both reliability and ease of operation
3Manufacturing precision
If rotary die with rotation about own axis is used for compensation, then the adaptability is improved for handling large numbers of laminations, but the manufacturing precision deteriorates due to clearance in guide device causing non-repetitive positioning
Solution Approach 1:
The conical wedge element maintains precise alignment during die rotation by providing continuous contact surfaces that eliminate clearance. As the die rotates to different angular positions for compensation, the conical geometry ensures that the pilot column remains centered in the bush throughout the rotation, maintaining alignment accuracy while enabling versatile positioning
Solution Approach 2:
The centering function is segmented into the wedge element and cavity components, allowing the die to be divided into rotatable and stationary parts. This segmentation enables the die to rotate for compensation while the centering mechanism remains stationary, maintaining precision across multiple angular positions and adapting to different lamination stacking requirements
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 solution enhances the precision and repetitiveness of die positioning, reducing misalignments and wear, while maintaining high production speeds and accuracy, even with inaccurate motor positioning, and is resistant to metal dust abrasion.
Implementation Method 1
at least one wedge-like element fastened to said mold and to be alternatively engaged in one of said at least two cavities of the sleeve with a conical coupling, in order to lock the sleeve following a rotation of the same
Data Source
AI summary
A mold houses a least one cutting die that defines a die axis. The mold has at least one punch aligned with the die axis and movable in a reciprocating manner that cooperates with the at least one cutting die to cut the laminate into the laminations by carrying out cutting steps. The mold has a centering device within the mold that locks the at least one cutting die into a desired position prior to each of the cutting steps. A punching movement of the at least one punch is coordinated with a feeding movement of the laminate to a location within the mold that is interposed between the at least one punch and the cutting die.