Abstract
<p>The heart of the machining center design is the spindle design, and one of the primary functions in the spindle design is a tool clamping system mechanism. The selection of disc spring stack for a tool clamping mechanism is an iterative process that highly depends on the spindle space availability, drawbar design, tool unclamp stroke length, and standard clamping force requirements. For example, even a design space of 0.1 mm may impact one kN clamping force depending on the disc spring stack design. Hence the design of the tool clamping system for a spindle is a time- intensive process and also needed careful attention. The iterative process of disc spring stack selection may lead to an unoptimized tool clamping system, which may not be the best design. This paper explains a dynamic way to find the best spring stack selection to optimize the spindle tool clamping mechanism based on the computational application.</p>
Highlights
A machining center spindle has a tool to remove the material from the workpiece in the machining process
An axial thrust cylinder-piston mechanism used to provide a significant thrust to the drawbar, which compressing the disc spring stack to release the tool through a collet mechanism [4], [5]
Jacob [20] proposed the User Interface clearly defined with required parameters. - Spring reference number to identify the manufacturer details from the database - Spring dimensions (De, Di, t, l0, i) and stack information (i, n, Total) for design reference - Spring stack length (L0) and forces (Fp, force requirement (Fu)) for further work on design of spindle and tool clamp cylinder
Summary
A machining center spindle has a tool to remove the material from the workpiece in the machining process. Zhu et al [3] described, a tool clamping system uses the preloaded disc springs with a combination of parallel and the series arrangement inside the spindle stack length to hold the tool. The selection of spring stack, drawbar length and outside diameter, spindle stack length and inside diameter, thrust cylinder stroke length and thrust load capacity, and spindle taper clamping force are highly correlated. It makes the system more complicated and needs an iterative process to design the optimized tool clamping system. They can collaborate with computer engineer to develop it
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