Multi-Spindle Machining Center Rework Using Spindle-Specific Correction
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Solution Overview
Problem
Multi-spindle machining centers face challenges in post-processing high-precision workpieces due to mechanical connection limitations, tool wear, and clamping system deviations, leading to inconsistent precision and increased complexity and cost, especially when trying to correct deviations in multiple workpieces simultaneously.
Innovation Solution
A method that allows for simple and time-saving post-processing by designating one work spindle as the post-processing spindle, generating correction data for each clamping system using reference workpieces, and using a workpiece measuring device to determine actual dimensions for precise correction, without requiring independent spindle adjustments or additional mobility, thus maintaining a straightforward machine center structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple work spindles are mechanically connected to perform the same movements, then productivity is improved by machining multiple workpieces in parallel, but manufacturing precision deteriorates due to inability to apply individual correction data to each spindle
Solution Approach 1:
The patent segments the correction process by assigning individual correction data sets to each work spindle. The control unit stores multiple correction data sets (first correction data for first spindle, second correction data for second spindle) and applies the appropriate correction data to each spindle independently, allowing each spindle to be optimized for its specific workpieces while maintaining parallel operation.
Solution Approach 2:
The patent implements preliminary action by measuring reference workpieces with each work spindle before actual production, generating specific correction data for each spindle in advance. This preliminary measurement and correction data generation enables subsequent workpieces to be machined with high precision without requiring real-time adjustments during production.
2Manufacturing precision
If a separate correction machine tool with single spindle is used for post-processing, then manufacturing precision is improved by applying individual correction data, but device complexity and cost increase
Solution Approach 1:
The patent makes the multi-spindle machining center universal by enabling it to perform both parallel machining and individual correction operations. The control unit is configured to store and apply multiple correction data sets for different work spindles, allowing the same machine to handle both high-volume production and precision correction without requiring a separate correction machine tool.
3Manufacturing precision
If corrective rework is performed on a separate correction machine tool, then manufacturing precision is improved, but productivity deteriorates due to required reclamping of workpieces
Solution Approach 1:
The patent merges the correction function with the original multi-spindle machining center. By configuring the control unit to store and apply individual correction data sets for each work spindle, the system combines parallel machining capability with individual correction capability in a single machine, eliminating the need to transfer workpieces to a separate correction machine and thereby maintaining continuous production flow.
4Ease of operation
If initial correction data is applied to both work spindles, then ease of operation is improved by uniform correction, but manufacturing precision deteriorates because each spindle has different morphological characteristics and wear levels
Solution Approach 1:
The patent applies local quality by assigning specific correction data sets to individual work spindles based on their unique characteristics. The control unit stores first correction data for the first work spindle and second correction data for the second work spindle, allowing each spindle to receive tailored corrections that account for its specific morphological differences and wear patterns, thereby optimizing precision for each spindle individually.
Data Source
Figure 1a~1b
Figure 2a~3b
Figure 4a~4b
AI summary
The present invention relates to a method for the parallel machining of multiple workpieces (381,382), in particular two workpieces, using a machining center (30), wherein the workpieces are clamped rigidly to each other in a set-up area (40) by means of a clamping system (37) and optionally with the aid of a gripping robot (39), are moved along a displacement path (36) into a machining area (32) and are machined simultaneously by means of a plurality of work spindles (241, 242), wherein correction data are generated for each workpiece (381,382) for post-machining, either by measurement of the actual dimensions of each workpiece after each machining by a workpiece measurement device (50) or by a one-time measurement of the deviation of the actual dimensions from reference workpieces on the basis of the clamping in the clamping system (37) by means of a clamping system measurement device (52), and wherein subsequently each workpiece (381,382) is post-machined one after the other by means of one of the two work spindles (241,242) on the basis of the generated correction data in order to thereby correct the deviations from the target dimensions.