Split-die Press Tool Inclined Side Surface for Powder Leakage Control
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Solution Overview
Problem
Conventional split-die press tools experience powder leakage during the filling process, which can affect operator health, damage the tool, and cause shape deviations in the green body of double-sided and double positive cutting inserts.
Innovation Solution
The split-die press tool design includes movable die sections and punch units with inclined side surface portions that minimize powder leakage by creating a narrow horizontal gap, where the second side surface portion acts as a restraining level to catch escaping powder, preventing it from leaking further.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the press tool uses a conventional design with horizontal die sections and vertical punches for forming green bodies, then the tool can produce double-sided and double positive cutting inserts with the required geometry, but powder leaks between the lower punch and die section side surfaces during filling
Solution Approach 1:
The invention introduces a vertically extending first side surface portion that is inclined downward and away from the pressing axis, creating a three-dimensional barrier structure. This inclined surface extends from the pressing level to an expansion level below, forming a barrier that intercepts powder in a vertical dimension rather than relying solely on horizontal clearance control.
Solution Approach 2:
The first side surface portion acts as an intermediary barrier between the lower punch and the die section. This intermediate inclined surface catches and redirects leaking powder back into the compression space, preventing direct contact between the punch and die section that would cause significant leakage.
2Reliability
If the press tunnel surface extends below the lower punch front end surface to allow green body expansion, then the green body can expand downward without damaging the bottom edge, but creates a larger gap that increases powder leakage
Solution Approach 1:
The invention applies different surface characteristics to different regions of the press tunnel. The first side surface portion has a specific inclination angle and vertical extension that is optimized for both preventing leakage and allowing expansion. The second side surface portion provides additional vertical extension with a different orientation to further control powder flow while maintaining expansion space.
Solution Approach 2:
The press tunnel surface is formed as a composite structure with two distinct side surface portions having different orientations and functions. The first portion inclines downward and away from the axis to catch powder, while the second portion provides additional vertical extension, creating a composite barrier system that addresses both leakage prevention and expansion requirements.
Data Source
AI summary
A split-die press tool for forming, by compressing a powder, a green body for a double-sided and double positive cutting insert for metal cutting. The tool includes a die with at least two die sections having a punch tunnel formed therebetween, an upper punch unit and a lower punch unit. When the lower punch unit is in a distal position a front end periphery of the lower punch unit is at a first expansion level corresponding to a maximal downward vertical decompression expansion of the green body to be formed. The punch tunnel has a first side surface portion on at least one of the die sections that has a vertical extension downward from the first pressing level to the first expansion level and is inclined downward and away from the pressing axis by an angle β of at least the angle α of an adjacent inclined lower surface of the green body.