Dummy Block for Extrusion Press with Expandable Collar
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Solution Overview
Problem
Existing dummy blocks for metal extrusion presses face limitations in efficiently transferring extrusion pressures due to design constraints, such as the need for lengthy bayonet connector lugs and outer connecting rings, which restrict the contact area and lead to lower operational pressures.
Innovation Solution
A dummy block design featuring a cylindrical base with an expandable collar and moveable plunger, where the collar and base engage interlockingly, and a stud or elongate projection with tapered lugs, allowing for increased pad area and direct force transfer, eliminating the need for lengthy bayonet connectors and outer rings, and incorporating a spring for reliable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If conventional dummy block design with bayonet connector lugs and outer connecting rings is used, then structural connection is achieved, but contact area is restricted and operational pressure is reduced
Solution Approach 1:
The invention removes the bayonet connector lugs and outer connecting rings from the dummy block design. By extracting these components, the patent eliminates the restrictions they imposed on contact area, allowing for a larger pad area that can sustain higher operational pressures during extrusion operations.
Solution Approach 2:
The invention merges the functions of connection and force transfer into a simplified dummy block structure. By combining the base, collar, and plunger into an integrated design without separate connecting rings and lugs, the patent creates a unified force transfer path that maximizes contact area and improves pressure distribution.
2Duration of action of stationary object
If lengthy bayonet connector lugs are used, then connection to extrusion ram is achieved, but stress concentrations increase and service life decreases
Solution Approach 1:
The invention extracts and eliminates the lengthy bayonet connector lugs from the design. By removing these stress-prone components, the patent prevents stress concentration at the connection points, thereby extending the service life of the dummy block through reduced fatigue and wear.
Solution Approach 2:
Instead of using lengthy lugs to achieve connection, the invention inverts the approach by using a compact base with circumferential flange and interlocking collar design. This inverted connection methodology achieves secure attachment to the extrusion ram while minimizing stress concentrations through a more favorable geometric configuration.
3Strength
If outer connecting rings are used, then structural integrity is maintained, but device complexity increases
Solution Approach 1:
The invention extracts and removes the outer connecting rings from the dummy block assembly. By eliminating this separate component, the patent reduces device complexity and the number of parts that require assembly, maintenance, and replacement, while maintaining structural integrity through the integrated base-colla plunger design.
Solution Approach 2:
The invention merges the structural functions previously distributed across multiple components (base, connecting rings, collar, lugs) into a unified dummy block structure. This consolidation maintains the necessary structural integrity for withstanding extrusion forces while significantly simplifying the overall device architecture.
Data Source
AI summary
A dummy block for a metal extrusion press comprises: a generally cylindrical base having a forward surface and an outwardly extending circumferential flange; an expandable collar coupled to the base, the collar having an inwardly extending circumferential rib abutting the circumferential flange; a collar support coupled to the base and abutting the collar; and a moveable plunger coupled to the base and accommodated by the collar. The plunger has a rear surface configured to abut the forward surface of the base.