Cast Refiner Plate Segments With Blunt Edges for Safe Handling
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Solution Overview
Problem
Conventional mechanical refiner plate segments made of hard alloys like stainless steel or white iron pose safety hazards due to sharp edges and corners, requiring costly and time-consuming hand buffing to mitigate injuries.
Innovation Solution
Incorporating cast blunt surfaces, such as chamfers or rounded sections, at the junctions of machined surfaces in the casting mold to create refiner plate segments that are safer and reduce manufacturing costs by preventing sharp edges from forming during precision machining.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If precision machining is applied to all surfaces of refiner plate segments, then manufacturing precision and performance are improved, but sharp edges and corners are created posing safety hazards
Solution Approach 1:
The patent applies preliminary action by incorporating blunt surfaces directly into the casting mold before machining. The mold includes blunt surface formers that create chamfered or rounded surfaces at junctions, which remain after machining removes excess material. This preliminary formation of safe edges eliminates the need for post-machining buffing operations.
Solution Approach 2:
The patent applies local quality by providing different surface characteristics at different locations on the refiner plate segment. The working surfaces require high precision machining for performance, while the junction areas where hands may contact are provided with blunt, chamfered, or rounded surfaces for safety. This localized differentiation resolves the contradiction between precision and safety.
2Object-affected harmful factors
If hand buffing is applied to reduce sharp edges, then safety is improved, but manufacturing time and cost increase
Solution Approach 1:
The patent applies self-service by designing the casting mold to automatically create the safety features (blunt surfaces, chamfers, or rounds) at junctions during the normal casting process. The mold includes specialized formers that shape the edges, and the machining process that follows automatically reveals these pre-formed blunt surfaces without requiring additional manual buffing operations. The system serves itself to create safe edges as part of the standard manufacturing流程.
Solution Approach 2:
The patent eliminates time loss by performing the edge-blunting action preliminarily during casting, before machining. The blunt surfaces are pre-formed in the mold, so when material is removed during machining, the safe edges are already present and require no additional processing time.
3Ease of manufacture
If conventional casting and machining processes are used, then manufacturing capability is maintained, but safety hazards and processing costs persist
Solution Approach 1:
The patent merges the safety feature creation with the existing casting and machining processes. Instead of adding separate buffing operations, the mold design incorporates blunt surface formers that work together with the standard machining sequence. The combination of modified casting plus conventional machining produces both precise working surfaces and safe edges in a single integrated process flow.
Solution Approach 2:
The patent maintains ease of manufacture by incorporating safety features into the preliminary casting stage. The mold includes formers for blunt surfaces, chamfers, or rounds that are created during normal casting operations, allowing existing manufacturing capabilities to produce safer products without requiring new equipment or processes.
Data Source
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AI summary
A cast metal plate segment for a refiner of lignocellulosic material or a disperser of comminuted paper or packaging products, the plate segment including a front side with a front surface configured to refine the lignocellulosic material or disperge the comminuted paper or packaging products, and a back side, opposite to the front side, including a corner or edge, wherein the corner or edge comprises a casted surface between machined planar surfaces adjacent the corner or edge.