Elastic Press Die Assembly for Consistent Punch Positioning
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Solution Overview
Problem
In traditional press die assemblies, variations in punch position due to inertia and thermal expansion lead to inconsistent pressing amounts, affecting machining accuracy and binding strength of workpieces.
Innovation Solution
A press die assembly with a stripper plate and coupling member system, featuring a punch with large-diameter portions and an elastic member to maintain consistent punch position and prevent back-pushing, ensuring accurate press working.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the slide is moved vertically at high speed, then productivity is improved, but the top dead center and bottom dead center of the slide vary due to inertia, causing variation in punch pressing amount
Solution Approach 1:
The invention changes the physical state of the coupling member from rigid to elastic, allowing it to deform under inertial forces during high-speed sliding. This elastic deformation absorbs the inertia-induced position variations, maintaining consistent punch pressing amount even at high sliding speeds, thus resolving the contradiction between productivity and manufacturing precision.
2Temperature
If thermal expansion or contraction occurs in the slide or bolster, then device complexity is improved (thermal management), but the relative positions of the punch and die hole change, affecting machining accuracy
Solution Approach 1:
The elastic member changes its elastic modulus with temperature, allowing it to compensate for thermal expansion or contraction of the slide or bolster. By selecting an elastic member whose elastic modulus varies with temperature in a specific range, the invention maintains constant relative positioning between the punch and die hole despite temperature fluctuations, resolving the contradiction between temperature management and manufacturing precision.
3Device complexity
If a rigid coupling member is used between the upper die and stripper plate, then device complexity is reduced, but the punch cannot maintain consistent position due to inertia and thermal effects
Solution Approach 1:
The invention uses an elastic member with temperature-dependent elastic modulus that remains relatively rigid at operating temperatures to maintain structural integrity, yet can deform elastically to compensate for inertia and thermal expansion effects. This resolves the contradiction between device complexity and manufacturing precision by using a single component that adapts its mechanical properties to operating conditions.
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
Enhances machining accuracy and reduces variation in workpiece dimensions, improving binding strength and reducing replacement costs by allowing separate component replacement.
Implementation Method 1
The elastic member is configured to urge the punch toward the restricting portion and to allow the upper die main body to approach the punch by being compressively deformed
Data Source
AI summary
A press die assembly includes a lower die, an upper die, a stripper plate provided between the lower die and the upper die, and a coupling member that couples the upper die and the stripper plate to each other such that the upper die and the stripper plate are movable relative to each other. The upper die includes a punch, an upper die main body, and an elastic member. The punch includes a first large-diameter portion and a second large-diameter portion. The upper die main body includes a restricting portion that restricts downward movement of the punch by contacting the second large-diameter portion. The elastic member is configured to urge the punch toward the restricting portion and to allow the upper die main body to approach the punch by being compressively deformed in a state in which the first large-diameter portion is in contact with the stripper plate.