Nested Conical Dies for Compact Presses

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Solution Overview

Problem

Existing presses for producing dimensionally stable preforms from pulverulent materials face challenges with complexity, size, and elasticity, leading to issues like buckling and stress, particularly due to the sequential arrangement of tool planes and the need for extensive accessories.

Innovation Solution

A press design featuring conically expanding dies that nest into each other, allowing for direct force transmission without pressure plates, reducing tool size and weight, and ensuring identical elasticity across tool planes, enabling higher rigidity and reduced machine downtime.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If tool planes are disposed sequentially with accessories (die holders, pressure plates, clamping plates), then the press can handle complex preform production, but the tool size and weight increase rapidly in the axial direction

Engineering Contradiction:

Improvecomplex preform production capabilityVSAvoidtool axial size

Core Design Contradiction:

Adaptability or versatilityVSLength of stationary object

Solution Approach 1:

The patent implements nesting by disposing multiple dies (first die and second die) concentrically along the axial direction, where one die is positioned inside another. This allows multiple tool planes to be arranged in a compact axial space without requiring sequential stacking of separate accessories, thereby reducing the overall tool length while maintaining the capability to produce complex preforms.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The patent merges the functions of multiple separate accessories (die holders, pressure plates, clamping plates) into an integrated die structure. The first and second dies are combined in a concentric arrangement, eliminating the need for separate sequential accessories and reducing the axial dimension of the tool while preserving all necessary functions for complex preform production.

Inventive Principle:

Principle #5Merging (Combining)

2Adaptability or versatility

If tool planes are extended to accommodate accessories and displacement paths, then the press can handle various pressing positions, but the risk of buckling and high stress increases

Engineering Contradiction:

Improvepressing position flexibilityVSAvoidbuckling and stress resistance

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

By nesting the first and second dies concentrically, the patent reduces the axial extension required for tool accessories and displacement paths. This shorter axial dimension decreases the critical buckling length and reduces the risk of Euler buckling and high stress in the cross-section, while the concentric arrangement maintains the necessary pressing position flexibility through the nested configuration.

Inventive Principle:

Principle #7Nested doll (Nesting)

3Adaptability or versatility

If multiple tool planes are arranged sequentially, then complex preforms can be produced, but the elasticity levels and stress in the cross section increase

Engineering Contradiction:

Improvecomplex preform productionVSAvoidcross-sectional stress resistance

Core Design Contradiction:

Adaptability or versatilityVSStrength

Solution Approach 1:

The concentric nesting of multiple dies reduces the axial length of the tool structure, which in turn reduces the cross-sectional stress and elasticity levels. The nested configuration allows complex preform production through multiple tool planes while maintaining better structural integrity and lower stress in the cross-section compared to sequential arrangement.

Inventive Principle:

Principle #7Nested doll (Nesting)

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 design results in more compact, efficient presses capable of producing complex preforms with improved density and reduced risk of buckling, while minimizing machine downtime and ensuring high-quality preforms with uniform relaxation.

Implementation Method 1

a first die and a second die are conjointly disposed as the upper die or the lower die so as to slide into one another... at least one of the two dies along a portion conically expands to the extent that the second end thereof has a width which corresponds to an external diameter of a die holder which is associated with the second end

Methodology Applied

Scientific EffectForce transmission: Force

Data Source

PatentUS11278962B2Press for producing dimensionally stable preforms and production process

Publication Date: 2022.03.22 GKN SINTER METALS ENG GMBH

AI summary

The invention relates to a press for producing dimensionally stable preforms from material that is substantially in the form of a powder, in particular iron powder and or ceramic powder, with a tool comprising an upper die and a lower die, wherein the upper die and the lower die respectively comprise at least one die, wherein a first die and a second die are arranged together, one sliding in the other, as the upper die or lower die and respectively have a first end and a second end, lying opposite the first end, wherein at least one of the two dies spreads out along one portion to such an extent that the second end thereof has a width that at least approaches an outer diameter of a die holder associated with the second end. This allows presses of a compact form to be made available for producing dimensionally stable preforms of high quality and great complexity.