Metallic Casing Rotary Cutting with Secondary Edges

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Solution Overview

Problem

The existing method for making metallic casings results in a poor appearance due to gaps formed at the boundaries of the sidewalls during the rotary cutting process, requiring additional polishing steps to rectify.

Innovation Solution

An apparatus comprising an upper and lower mold with sharp edges and secondary-cutting edges is used for a rotary cutting process, allowing precise control to maintain uncut portions and eliminate gaps by defining a cut-out adjacent to the cutting edges, ensuring seamless separation of excess portions and enhancing the appearance of the casing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a rotary cutting process is used to separate excess portions from the preform, then the excess portions can be removed, but gaps are formed at the boundaries of the sidewalls resulting in poor appearance

Engineering Contradiction:

Improveexcess portion removalVSAvoidboundary gap formation

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The cutting edges are divided into multiple segments: primary cutting edges for initial cutting and secondary cutting edges for finishing. This segmentation allows different parts of the cutting edge to perform different functions - the primary edges remove material while the secondary edges clean up the cut to prevent gap formation at boundaries

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The secondary cutting edges are positioned to act after the primary cutting edges have made the initial cut. This preliminary action by the primary edges followed by the finishing action of secondary edges ensures that gaps are prevented before they can form at the sidewall boundaries

Inventive Principle:

Principle #10Preliminary action

2Manufacturing precision

If additional polishing steps are added to remove gaps, then the appearance can be improved, but manufacturing time and complexity increase

Engineering Contradiction:

Improvegap removalVSAvoidmanufacturing efficiency

Core Design Contradiction:

Manufacturing precisionVSProductivity

Solution Approach 1:

The cutting apparatus performs its own finishing function through the secondary cutting edges that are integrated into the same tool. The secondary edges automatically clean up the cut and prevent gap formation without requiring a separate polishing process, making the cutting tool self-sufficient for both rough and finish cutting

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The primary cutting function and the gap-prevention finishing function are merged into a single cutting apparatus with multiple cutting edges. This combination eliminates the need for separate polishing equipment and operations, integrating both functions into one step

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS8297100B2Method and apparatus for making metallic casing

Publication Date: 2012.10.30 HONG FU JIN PRECISION IND (SHENZHEN) CO LTD

AI summary

An exemplary apparatus for making metallic casing, the apparatus includes a first mold and a second mold, the first mold is opposite and movable relative to the second mold, the first mold defines a rectangular depression opposite to the second mold. The rectangular depression forms a plurality of side surfaces interconnecting to each other. Each side surface has a sharp edge. The second mold includes a plurality of cutting edges corresponding to the sharp edges respectively, one of the cutting edges has a secondary-cutting edge.