Electricity: motive power systems – Positional servo systems – Program- or pattern-controlled systems
Patent
1987-09-25
1989-04-04
Shoop, Jr., William M.
Electricity: motive power systems
Positional servo systems
Program- or pattern-controlled systems
318565, 318569, 36447434, G05B 1910
Patent
active
048189251
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a device for setting the working point of a tool with respect to a reference plane or a reference point in an NC machine tool with a tool slide system to which the tool is attachable and with which the tool point is movable in a plane of motion, and with a path measuring system for the tool slide motion which is connected to a machine control system, and with a control sensor for transmitting a correction signal to the machine control system and having a sensing point which can be brought in the plane of motion of the tool point into the reference plane or to the reference point, up to and over which the tool point can be moved by program control, starting from a starting point of the tool slide, with the starting point of the tool slide and the reference plane or the reference point being spaced at a specified distance from one another and with distances of the tool point from the starting point of the tool slide specified by program commands for machining a workpiece being balanced by the machine control system against distances which can be evaluated by the machine control system on the basis of the correction signal and also on the basis of path measurement signals of the path measuring system.
Known devices of this kind, for example, that according to German Patent 1,945,017 of the applicant company and its marketed device for measuring tools in the working area of NC lathes comprise a quasi-stationary control sensor which prior to the measuring procedure must be swung or moved into a stationary location in the working area of the machine tool which is easily accessible by the tool. Since this location is usually in the normal working area of the tools, the control sensor must be removed again after the measuring procedure. The swinging in and out or moving in and out involves considerable structural and manufacturing expenditure because the motions of the control sensor must be carried out quickly and precisely. In spite of precise design, the leverage ratios, for example, in a control sensor which can be swung in, in relation to its sensing point, result in a certain tolerance range of the measuring position of the sensing point of the control sensor which impairs precision of the measurement of the working point of the tool edge. The above-mentioned leverage ratios also increase the dispersion of the position of the sensing point of the control sensor owing to heat influences. A further disadvantage of the known measuring device is that the chuck for the workpieces which are to be machined and the workpieces themselves influence the availability of space for the measuring device. With unfavorable workpiece dimensions, it may be necessary to unclamp the workpiece to enable measurement of a tool, which is not only time-consuming and tedious, but also involves problems with respect to precise adjustment of the workpiece which has to be reclamped.
The known measuring device also requires a time-consuming measuring cycle: The control sensor must first be swung or moved into the working area of the machine tool, whereupon the tool is moved itto a position in the proximity of the control sensor. The tool point is then brought up to the control sensor at a low speed of the tool slide system. After generation of the correction signal, the tool must first be moved away from the control sensor before the latter can be swung out of the working area. If the control sensor were approached by the tool at a higher speed, the control sensor could break if the slide carrying the tool caused too great a deflection of the control sensor as a result of a larger slowing down path.
Finally, in a lathe comprising one tool carrier at the front and one tool carrier at the rear of the axis of rotation of the workpiece for machining shaft-type workpieces, in order to measure the tools of the rear tool carrier with the known measuring device, the workpiece must be unclamped prior to the measuring procedure or two measuring devices must be used.
The object underlying the invention was to provide a devic
REFERENCES:
patent: 4620281 (1986-10-01), Thompson et al.
Traub AG Instruction Manual, "Integrierte Messteuerung", (44 pp.).
Brochure "CNC-Drehmaschinenreihe Traub-TNA 480", (7 pp.).
Brochure "CNC-Drehmaschinenreihe Traub-TNS 30", (20 pp.).
Grossmann Walter
Lahm Heinrich
Schleich Gunther
Bergmann Saul M.
Index-Werke KG Hahn & Tessky
Shoop Jr. William M.
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