Radially Pivoting Chuck for Internal Profile Forming

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Solution Overview

Problem

Existing devices for molding internal and external profiles or toothings on preforms require a spacer ring and parallel key, leading to high forming temperatures and increased manufacturing time due to excessive stress on the chuck, which can result in damage such as broken teeth.

Innovation Solution

The chuck is designed to be radially pivot-mounted with the mandrel, allowing material flow with both axial and radial components, enabling the chuck to yield under pressure and reduce friction, thus preventing overstressing and lowering forming temperatures for faster processing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If the chuck is fixed rigidly on the mandrel, then the structural stability is improved, but the chuck teeth can break due to excessive radial forces during material displacement

Engineering Contradiction:

Improvestructural stabilityVSAvoidchuck tooth durability

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

The chuck is designed with radial pivot capability, allowing it to dynamically adjust its position in response to radial forces during material displacement. This dynamic feature enables the chuck to yield under excessive pressure through controlled movement, preventing tooth breakage while maintaining operational stability

Inventive Principle:

Principle #15Dynamics

2Productivity

If high forming pressures are applied to the preform, then the forming speed is improved, but the forming temperatures significantly increase

Engineering Contradiction:

Improveforming speedVSAvoidforming temperature

Core Design Contradiction:

ProductivityVSTemperature

Solution Approach 1:

The radially movable chuck reduces friction between the chuck and preform during material displacement. This dynamic design allows the chuck to move with the material flow, significantly reducing frictional heating and enabling faster forming cycles at lower temperatures

Inventive Principle:

Principle #15Dynamics

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 solution prevents damage to the chuck and toothings, reduces forming temperatures, and allows for faster production of work pieces by enabling the chuck to move with the forces applied, resulting in more efficient manufacturing.

Implementation Method 1

the friction in the radial direction of the mandrel is reduced significantly, thus generating significantly lower forming temperatures

Methodology Applied

Scientific EffectFriction: Friction

Implementation Method 2

Due to the material flowing from the preform because of the pressure, the material not only flows axially due to the rotation of the mandrel but the material flow also has a radial or tangential component, respectively

Methodology Applied

Scientific EffectPlasticity: Plasticity

Data Source

PatentUS8984921B2Device and process for producing or processing workpieces from a preform, in particular for integrally forming internal profiles or internal tooth systems

Publication Date: 2015.03.24 REPKON MASCH & TOOL IND & TRADE LTD

AI summary

A device for manufacturing or processing work pieces consists of a preform (4.1), with a mandrel (1a) that is supported rotatably and parallel to a longitudinal axis (x) of the device, an associated chuck (1b) for clamping the preform (4.1) as well as a spindle sleeve (2a) that can be coupled with the mandrel (1a) and can be moved along the longitudinal direction (x), and with a forming unit (3) for forming the preform (4.1). The chuck (1b) is designed in a rotational fashion in relation to the mandrel (1a).