Assist Punch Pressure Control for Single-Stage Deep Drawing
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Solution Overview
Problem
Existing assist drawing technologies face challenges in preventing thinning and cracking, especially when working with materials like aluminum alloys, and require multiple stages of drawing and machining, leading to increased production costs and complexity.
Innovation Solution
The assist drawing device incorporates a punch, drawing die, blank holder, assist punches, and a control system that dynamically controls the assist pressure based on the position of the punch, ensuring optimal pressure synchronization during the drawing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If multiple stages of drawing and machining are performed to achieve deep drawing, then product depth is increased, but production cost and process complexity increase
Solution Approach 1:
The dynamic assist pressure control enables single-stage deep drawing by adapting the pressure throughout the drawing process. This eliminates the need for multiple drawing and ironing stages, achieving deep products in one operation while reducing process complexity and production cost.
Solution Approach 2:
The system changes the assist pressure parameter dynamically during the drawing process to enable deep drawing in a single stage. By varying the pressure according to punch position, the material can be drawn to greater depths without thinning or cracking, avoiding the need for multiple machining stages.
2Length of moving object
If multiple punches are used for multi-stage machining, then product depth is achieved, but the amount of machining oil and coolant oil required increases
Solution Approach 1:
The dynamic assist pressure control enables deep drawing in a single punch operation, eliminating the need for multiple punches and associated machining fluids. This reduces the quantity of machining oil and coolant oil required while achieving the same product depth.
Solution Approach 2:
The invention combines multiple drawing and ironing operations into a single deep drawing operation by using dynamic assist pressure control. This merging of processes eliminates the need for separate machining stages and their associated lubricants and coolants.
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 configuration allows for the formation of products with deeper depths while effectively suppressing thinning and cracking, reducing the need for multiple punches and stages of machining, and thereby lowering production costs and simplifying the process.
Implementation Method 1
a tensile stress applied to the material causes thinning, cracking, or the like. Thus, in the assist drawing method or apparatus, a compressive stress field is formed at a location of the material to which the tensile stress is applied during forming so that thinning, cracking, or the like is suppressed
Implementation Method 2
the assist punches (pressurizing plates) 6 are pressed by a pressurizing device which uses a fluid pressure or the like, for example, a hydraulic pressure
Data Source
AI summary
Provided is an assist drawing device by which, when a punch is moved from a stroke start edge toward a stroke end edge in accordance with a command from a control device to a punch drive unit, and drawing is performed in cooperation with a drawing die to thereby perform the drawing, assist drawing is performed while pressing a blank material against the drawing die by a blank holder and pressing both end surfaces of the blank material by assist punches, and in which the control device includes an assist pressure control unit configured to control an assist punch drive unit such that, when the assist drawing is performed, an assist pressure of the assist punches reaches a target assist pressure in accordance with a position of the punch.