Dual Workpiece Tables for Long Toothed Rack Machining
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Solution Overview
Problem
Existing machines for milling or grinding toothed racks have long downtimes and high unit costs due to inefficient loading and unloading processes, limited maximum length of workpieces, and high complexity in maintaining precision, leading to suboptimal productivity.
Innovation Solution
A machine design with dual preparation areas and workpiece tables that can be coupled and moved synchronously, allowing continuous operation, reduced space requirements, and enhanced positioning accuracy through opposing drive torque, along with optional robotic assistance for loading and cleaning, enabling longer toothed rack machining without modifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single workpiece table is used in existing machines, then the machine structure is simpler, but the machine has long downtimes and lower productivity due to sequential loading/unloading operations
Solution Approach 1:
The workpiece handling system is segmented into two independent workpiece tables (first and second workpiece tables) with separate preparation areas. While one table is being machined, the other can be loaded and prepared, enabling parallel operations and eliminating idle time. This segmentation resolves the contradiction by doubling the handling capacity without requiring complete redesign of the machining system.
Solution Approach 2:
The preparation areas allow workpieces to be pre-loaded onto workpiece tables before they enter the machining workspace. This preliminary action ensures that whenever a workpiece table completes machining, another table is already ready to immediately replace it, eliminating downtime. The preliminary loading and positioning operations occur outside the critical machining path, maintaining productivity while managing system complexity.
2Length of moving object
If toothed racks are manufactured in longer lengths, then fewer pieces are needed for the same application, but machining precision cannot be maintained due to accumulated errors
Solution Approach 1:
The workpiece table system can be configured with multiple tables that can be coupled together to form an extended machining surface. This allows the effective machining length to be increased by combining multiple standardized table units, maintaining precision through modular assembly rather than requiring a single large table that would amplify positioning errors.
Solution Approach 2:
The opposing drive torque mechanism acts as an intermediary that compensates for positioning errors and maintains precision across extended workpiece lengths. By applying counteracting forces through the opposing drives, the system compensates for accumulated errors that would otherwise occur over longer machining distances, enabling accurate machining of extended toothed racks.
3Loss of time
If loading and unloading operations are performed sequentially on a single workpiece table, then the machine structure is simpler, but downtimes increase and cycle times become longer
Solution Approach 1:
Two workpiece tables with their respective preparation areas are merged into a coordinated system where both tables operate in parallel. The coupling mechanism allows the tables to function independently during loading/unloading while maintaining synchronization during machining. This merging enables simultaneous preparation and machining operations, eliminating sequential downtime without creating entirely separate independent systems.
Solution Approach 2:
The dual workpiece table system ensures continuous useful action by eliminating idle time. While the machining head processes workpieces on one table, the other table continuously undergoes loading, positioning, and preparation operations. This continuous parallel operation maintains productive action throughout the entire cycle, removing the downtime gaps inherent in sequential single-table operations.
4Length of moving object
If the workpiece table dimensions are increased to accommodate longer toothed racks, then longer racks can be machined, but the machine footprint and space requirements increase
Solution Approach 1:
Instead of using a single large workpiece table, the system segments the workholding capacity into multiple smaller tables that can be coupled together. This allows the machine to accommodate longer toothed racks by combining multiple standardized table units rather than requiring one oversized table, thereby limiting the increase in machine footprint to only what is necessary for the modular configuration.
Solution Approach 2:
The workpiece tables are designed with movable and adjustable characteristics, allowing them to be reconfigured for different workpiece lengths. The tables can be positioned, coupled, and decoupled dynamically based on production requirements, enabling the machine to handle various rack lengths without requiring a fixed large footprint designed for maximum capacity.
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 significantly reduces downtimes, increases productivity, and allows for machining of longer toothed racks with improved accuracy and efficiency, reducing operational costs and complexity.
Implementation Method 1
the coupled workpiece tables can be moved collectively, in particular with the aid of opposing drive torque
Implementation Method 2
they are usually held and positioned magnetically on a workpiece table
Data Source
AI summary
A machine for the milling or grinding of toothed racks, having a workspace, in which a machining head carrying milling and/or grinding tools is movably arranged is provided. The machine further has a first preparation area arranged on a first side of the workspace, which has a first workpiece table reversibly movable from the first preparation area into the workspace, and which for its part has first positioning means for workpieces. The machine has a second preparation area, which is arranged on a second side of the workspace, and has a second workpiece table which can be reversibly moved from the second preparation area into the workspace, and which for its part has second positioning means for workpieces. A corresponding method is also provided.