Product category:
Machining centres - all types
News Release from: Cincinnati Machine | Subject: Specht Xperimental HMC
Edited by the Manufacturingtalk Editorial
Team on 17 October 2001
Parallel kinematics HMC is
self-calibrating
Cross Hueller has built an experimental machine for the ACCOMAT (ACcuracy COntrolled MAchine Tool) Project in collaboration with wbk, WZL, Siemens, Zeiss and ISW.
Cross Hueller has built an experimental machine, the Specht Xperimental, for the ACCOMAT ( ACcuracy COntrolled MAchine Tool ) Project in collaboration with wbk, WZL, Siemens, Zeiss and ISW This is a prototype for a self-calibrating machine tool for milling and drilling prismatic workpieces
This article was originally published on Manufacturingtalk on 12 Mar 2003 at 8.00am (UK)
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The automatic calibration system used is called "accuracy control" and enhances accuracy via a mechatronic approach without needing temperature control for the machine or the environment.
The goal is to reduce positional inaccuracies by 50% of that currently achievable by compensating for variations due to: * machine geometry misalignments.
* temperature changes.
* wear of machine tool elements.
Linear and rotary misalignments between spindle and fixture are measured by laser interferometer and photo sensitive diodes.
These are then continually compensated for by offsets in the machine's control system.
The parallel coupler kinematics in X/Y is equipped with linear direct drives and offers ideal preconditions to integrate the sensors.
This "Quantum Leap" in machine design provides the perfect solution for ensuring high stiffness is achieved with optimum dynamic response in the minimum of space.
This development of non-cartesian kinematics principles is seen as the optimal solution for Cross Hueller's market segment.
The Z axis of the machine is driven by conventional ball screw.
The direct driven rotary table (B axis) and the 4 piezo-actuators (A axis) compensate for rotational misalignments.
Machine traverses include an X-axis stroke of 630mm, Y-axis stroke of 630mm (centre 1065mm and Z-axis stroke of 750mm.
Machine width is 1700mm.
Stiffness for the spindle / fixture, X / Y axes is greater than 30N/æm.
Position uncertainty (planned) is 5micron.
Motor spindle has a HSK 63 tool adapter.
Driving power (100% ED) is 60kW and spindle torque (100% ED) is 38Nm.
Spindle speed is 20.000 rev/min.
Acceleration time to reach 10.000 rpm / 20.000 rpm is 0,45 / 0,9s Feed and rapid traverse rate in the X-axis is 120 m/min, Y-axis is 120m/min and Z-axis is 60m/min.
Acceleration in the X/Y-axes is about 15 m/sec2 and in the Z-axis, about 10 m/sec2.
Control is Siemens Sinumerik 840 D.
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