Planar Pulse Generator Module for Wire EDM Thermal Management
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Solution Overview
Problem
Current electric discharge machines face challenges in positioning the pulse generator module close to the working area without causing thermal issues and accommodating the limited space, while maintaining effective cooling and accessibility.
Innovation Solution
The pulse generator module is designed with generator boards arranged in a single plane within a protective enclosure, mounted adjacent to the work tank, using a high-speed serial bus connection and fluid cooling to manage heat dissipation, and thermally insulated to prevent heat transfer to the machining fluid and workpiece.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the pulse generator module is positioned close to the working area, then the pulse shape quality improves and electromagnetic emissions are reduced, but thermal distortion of the machine frame and workpiece increases
Solution Approach 1:
The generator enclosure is divided into separate thermal zones with insulated passageways for current supply. The cooling circuit is segmented into dedicated generator cooling channels separate from the work tank cooling system, allowing independent temperature control of each component.
Solution Approach 2:
Thermal insulation panels are introduced as intermediary elements between the generator enclosure and the work tank to block heat transfer. Insulated passageways act as thermal barriers while still allowing electrical current to flow to the electrodes.
2Manufacturing precision
If the generator enclosure is mounted adjacent to the work tank, then the lead distance is reduced improving pulse quality, but the space availability is limited
Solution Approach 1:
The generator enclosure is designed with a flat, planar configuration that mounts to the back wall of the work tank, utilizing the vertical dimension and wall surface area rather than occupying additional horizontal workspace. This dimensional reconfiguration allows proximity to the spark gap without encroaching on the limited working volume.
3Ease of repair
If the generator boards are arranged in a rack with parallel PCBs, then accessibility and serviceability improve, but the device complexity and cabling requirements increase
Solution Approach 1:
Multiple generator boards are mounted in the same plane within a single enclosed housing rather than stacked in separate rack positions. The cooling system is merged into the enclosure structure itself, with cooling channels integrated into the housing walls, eliminating the need for separate external cooling apparatus.
4Temperature
If the machining liquid is used for direct cooling of the generator module, then the cooling efficiency improves, but the temperature stability of the working fluid deteriorates
Solution Approach 1:
The cooling system is segmented into separate circuits: one dedicated to generator cooling and another for work tank cooling. This segmentation allows the machining liquid to cool the generator effectively without absorbing excessive heat that would compromise the temperature stability required for precise machining operations.
Solution Approach 2:
A heat exchanger is introduced as an intermediary device that transfers heat from the generator cooling circuit to the machining liquid supply, allowing efficient generator cooling while maintaining temperature control of the working fluid through separate thermal management zones.
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 allows for improved machining precision by maintaining optimal pulse shape and reducing thermal distortion, simplifying cabling, and lowering manufacturing costs while minimizing electromagnetic emissions and thermal interference.
Implementation Method 1
a fluid cooling circuit (61) to remove the heat dissipated on said boards
Implementation Method 2
a fluid cooling circuit (61) to remove the heat dissipated on said boards
Implementation Method 3
at least part of the generator enclosure (51) is thermally insulated
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
The invention relates to a pulse generator module (50) for electric discharge machines which comprises a generator enclosure (51) containing PCBs, whereas at least one of the comprised PCBs is a generator board (52). The invention is characterized by the fact, that the comprised PCBs (52) are all arranged in one plane.