Back Pressure Device for Progressive Die Laminates
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Solution Overview
Problem
Existing back pressure devices for progressive die apparatuses are complex and costly, and they fail to prevent iron core laminates from being pushed upward due to excessive pressure, requiring a simpler and more effective mechanism for applying suitable back pressure during the blanking process.
Innovation Solution
A back pressure device with a vertically moveable support table driven by a lifting motor, controlled by a unit that sets torque limit values to manage the motor's output torque, ensuring appropriate back pressure is applied during the blanking interval while preventing the iron core laminates from being pushed upward, using a ball screw for reverse movement to buffer the load and a control unit for precise position control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a support table is placed under the squeeze ring to apply upward back pressure on the iron core laminates, then the crimping mechanical strength is increased, but the iron core laminates may be pushed upward by the support table if the back pressure exceeds the retaining force
Solution Approach 1:
The support table is made vertically moveable instead of fixed, allowing it to dynamically adjust its position and apply back pressure only when needed during the blanking process. The lifting motor controls the vertical movement, enabling the support table to move downward during blanking to apply back pressure, then return to its initial position to prevent upward pushing of laminates.
Solution Approach 2:
The control unit receives signals from the detection unit that detects the position of the punch, and based on this feedback, controls the lifting motor to adjust the support table's vertical position. When the punch is in the blanking position, the support table moves downward to apply back pressure; when the punch moves away, the support table returns to its initial position, creating a closed-loop control system that prevents excessive pressure.
2Stress or pressure
If a vertically moveable base table with an elastic member (gas spring) is used to apply back pressure, then the back pressure is more effectively applied to the iron core laminates, but the structure becomes complex and costly
Solution Approach 1:
The elastic member (gas spring) is replaced with a lifting motor that directly drives the support table vertically through a ball screw mechanism. This substitution eliminates the need for complex elastic members and their associated guide mechanisms, while achieving the same back pressure application function through controlled motor movement.
Solution Approach 2:
The lifting motor serves multiple functions: it moves the support table vertically to apply back pressure during blanking, positions the support table at the initial position to prevent upward pushing, and can be controlled to maintain the support table in various positions. This single component replaces the previous complex system of elastic members, guide members, and assist mechanisms.
3Stress or pressure
If the support table is made vertically moveable to apply suitable back pressure, then the back pressure can be controlled during blanking, but a guide member or assist mechanism is required to maintain the upper surface of the support plate in a horizontal attitude
Solution Approach 1:
The vertical movement function and the horizontal positioning function are merged into a single integrated system. The lifting motor, through the ball screw mechanism, simultaneously achieves vertical movement control and maintains the support table's horizontal attitude. The control unit coordinates the motor's movement to ensure the support table remains horizontal while applying back pressure, eliminating the need for separate guide members.
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
The solution allows for a simple, cost-effective application of suitable back pressure during both blanking and non-blanking intervals, enhancing contact between iron core laminates and increasing their volume ratio without pushing them upward, thus improving the manufacturing process efficiency.
Implementation Method 1
using a ball screw for reverse movement to buffer the load
Implementation Method 2
A back pressure device with a vertically moveable support table driven by a lifting motor, controlled by a unit that sets torque limit values to manage the motor's output torque
Data Source
AI summary
In a back pressure device for progressive die apparatus, a suitable back pressure can be produced during the blanking interval preventing the iron core laminates from being pushed upward by using a simple structure. The back pressure device for progressive die apparatus comprises a support table (31) disposed in a vertically moveable manner in an iron core retaining member (22) for retaining iron core laminates blanked from the sheet steel strip in the progressive die apparatus (1) and for stacking the iron core laminates thereon one after another, a support unit (32) for supporting the support table, a lifting motor (33) for causing a vertical movement of the support table via the support unit and a control unit (34) for controlling a rotational motion of the lifting motor, wherein the control unit is configured to set a plurality of torque limit values for limiting an output torque of the lifting motor depending on an action of the progressive die apparatus so that the output torque is limited by a largest of the torque limit values during a blanking interval for the iron core laminates.