DD143106A1 - METHOD AND MEASURING DEVICE FOR LOCATING THE ROTATION AXES OF ROTATIONAL SYMMETRIC WORKSTUECTS - Google Patents

Abstract

Method and measuring device for determining the position of the rotational axis of rotationally symmetrical workpieces of different, particularly large diameters, on an individual workpiece held between workpiece holders, centers or steady rests in preparation for or during external cylindrical machining on a machine tool, preferably a roll turning or roll grinding machine. The invention enables position determination by means of a measuring device of simple construction and effective handling in a process without deficient requirements. This eliminates the need to first perform an outgoing machining step on a workpiece held in a four-axis machine tool before the first measuring process to determine its cylindricity deviation. This determination of the position of the rotation axis is achieved by determining the distance of the workpiece periphery from a reference line parallel to the tool guide in the machining direction of the machine tool in at least two measuring positions, whereby an indicator of the measuring device, in an axially movable sleeve centrally in the opening angle of a pair of prism cheeks guided through its apex, is used in a double way both to mark the workpiece peripheral distance and to fix a measuring reference point for the workpiece half-diameter determination.

Description

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Title of the invention. ^{; c} A

Method and measuring device for determining the position of rotation.

axis of rotationally symmetrical workpieces

Field of application of the invention

The invention relates to a method and a measuring device for determining the rotational axis rotationally symmetrical workpieces of different, in particular large diameter, on a between V / erk piece-recording tips and / or recorded in lunettes or pegs Einzelwerkstüc) in preparation for Äußenrundbearbeitung or during the same on a machine tool, preferably for external turning or external cylindrical grinding of elongate, heavy individual workpieces on a roll lathe or roll grinding machine.

Characteristic of the known technical solutions To determine the position of the axis of rotation of rotationally symmetrical · workpieces is known from DE-PS 1 288 949, so when grinding of workpieces at least two offset in the axial direction workpiece points each provide a measuring head for scanning the diameter and the measured values at mutual deviation from the predetermined values to form the difference value for correcting the axial position between the grinding spindle and the -spindel- "gelagerten'Werkstück zoom pull" the invention-Bgemäße Before ^*: direction thereof is so designed that according to the measured values with actuation of a pressure member is an elastically deformable connecting member. on the spindle bearing head, the same value in the amount of the differential value for the correction of the axial position. ....; ', -:' · .. · '' · .. '' · '-': '..ΐ: ·:'; -:?: ..; i ^; ': ^· - ·'

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Furthermore, it is known, starting from various diameters measured on the workpiece, to adjust the parallelism or a desired angular position of the axis of rotation of rotationally symmetrical workpieces or to correct them according to the method determined by continuous measuring. Upon reaching the nominal dimension of one of these diameters, the machining process is interrupted and corrects the parallelism or V / ink layer according to the remaining excess of the nominal size of another diameter.

A measuring device for a machine tool, which is suitable for continuously measuring diameters, in particular for measuring highly divergent workpiece diameter in external cylindrical grinding, is known from DE-AS 2022 742 (Union priority US 824433). This measuring device, which comprises an elongate, an axially movable feeler housing leading symmetrically to the Tastgliedspitze branching Tangentiallehrenschenkel for attaching the device to a cylindrical workpiece, according to the invention features: ·: .. A transducer, which housed in the housing and with the feeler The sliding of the feeler against the cylindrical workpiece takes place via an elastic pressure element , which acts with almost always a constant pressure force ^.

A disadvantage of the above-mentioned procedure according to the method and the device or measuring device to be used for determining the position of the axis of rotation of rotationally-symmetrical workpieces during cylindrical grinding is that the! For external cylindrical machining of workpieces accommodated in a machine tool, invariably only require a preceding machining operation prior to the initial measuring operation to determine the at least two workpiece diameters for a possible cylindricity compensation or to determine a correction value for an optionally different position determination of the rotational axis of the workpieces. In addition, the dimensions of conventional diameter measuring devices and in particular those of the measuring device according to DE-AS 2022 742 grow strongly, so that so to work \

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In addition, measuring devices of such dimensions and weight are no longer safe and can be handled with the appropriate precision, as is ultimately required for gum eating in the / um range. _v Similarly affect measuring devices such prostitute ions visibility and accessibility to the machine tool on which the machining particularly long and serious piece products relatively large diameter occurs ·

Object of the invention

The aim of the invention is relative to weighty, present in large dimensions rotationally symmetrical workpieces of different, especially large diameter, in effectively simple structural design for easy handling and without deficient requirements of a method and a measuring device to be applied, determining the position of the rotation axis on a to enable rotation-arresting or rotationally-moving individual workpieces received on a tool-making machine between tool receiving tips or setting blocks .

Explanation of the essence of the invention

The invention lie ^v gt ^ the object of one. Method and, to propose a measuring device for carrying out the method for determining the rotational axis rotationally symmetrical workpieces of different, especially large diameter on a recorded between WerkStückaufnahmespatζen or on pegs rotationsruhendem or rotationally moving weighty individual workpiece on a machine tool, the need to exclude, at such in one Machine workpiece recorded before the first measuring operation to determine a possible cylindricity deviation or a correction value for an otherwise otherwise position determination of the workpiece rotation axis only a previous processing operation to perform ·

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In addition, the measuring device to be used in accordance with its dimension and function allowed ^ that the same safe and with appropriate precision for Genaumessen in / around area is operated and used.

According to the invention, the object is achieved in relation to the method in that using a in.V / irk-connected with one of the longitudinal guide elements for the tool in the machining direction of the machine tool in a known manner determining a workpiece radius on three specific Meßbezugspunkte on the Circumferential line of assignable workpiece ~ circular cross-sectional area allows the following steps are performed:

a) Determining and storing a proportional measured value

the Ab stand between a workpiece surface line and a

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parallel to the tool guide in the machining direction of the machine tool selected reference line in the position of the measuring device in a first measuring position;

b) determining and storing a proportional measurement value

for the workpiece radius also in the position, _: .- the measuring device in the first measuring position using the left touch position of the measuring device to the workpiece periphery in determining the proportional measurement of the distance after step a) _t ^?

c) summing the stored measured values according to the method steps a) and b), ν '·.'' V

d) carrying out the method steps according to a) to c) in repetition of the same in the position of the measuring device in a second or a further Meßposit ^ pn in each case a selected distance in the axial direction to the first or another defined measuring position, Λ '

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e) forming the difference between the summed heights of the measured positions to be set and determining a correction value taking into account the distance in the axial direction zv / ischen the respective measuring positions »

Furthermore, the invention. The task with respect to the measuring device for carrying out the method is achieved in that using a known, located in a certain opening angle Prismenwangenpaares and a center in the 'opening angle of the two Prismenwangen, axially guided on a straight line through the angle vertex quill, in the zent.risch an axially movable indicator'is available, longitudinally guided on a adaptation base body and -einrichtbar a pinole carrier and a drive unit carrier is arranged and fixed. The pinole carrier coaxially surrounds the quill, which can be moved longitudinally axially by a rotary translator, and aligns with the front of the drive unit carrier a speed former and, behind it, aligned behind the axis.

a stepper motor on the front side -. both Drehbewegungsvlirbunden by a flexible coupling is attached. '. , "In addition, a double-pin piece of the quill at its peripheral free end near the indicator arranged there frontally

Climber-bound from the outside embraces and around both solid Kirrzapfen ·

the Doppelzapfenstückes a Parallelführungs- and -stell'einheit for the prism beam pair is tilt-rotatably mounted. γ

The Parallelführungs- and -Stelleinheit is equipped so that both sides of a first, a Kurzzapfenjdes double pin piece enclosing bearing sleeve extends eoiiee Geradführungssäule and on both sides of a second, 'the other short pin of Doppelzapfenstücks enclosing bearing sleeve extends a center divided opposite run causing Stellführungsspindel arranged, the ends each extension side are 'spaced' by one transverse yoke each, and on the outside of the outer side at one of the transverse yokes. is achsfluchtend arranged to Stellstellspindel eii Positionr actuator attached. , , :.

The prism cheek pair is expediently composed of two individual ------

cheek body, the cross-section related to the linear guide column and Ste11führungsspindel ever a Geradführungsgegenelement and a Stellführungsgegenelement the Stichmaßabstand both guides have been arranged and fixed to each other on connecting webs ·

Execution example ·, '·

The invention is explained in more detail below with reference to an exemplary embodiment. The corresponding drawings show: ^. ,

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Pig · 2; the measuring device seen in side view from Y / erkstück from.

After Pig · 1 is longitudinally guided on a basic adaption body 1 and -inrichtbar a Pinolenträger 2 and a Antriebsaggre-: gateträger 3 arranged and fixed. The basic adaptation element rests on the longitudinal slide (not shown) of the tool support as a longitudinal guide element for the tool of the machine tool in the machining direction of the same. Coaxially enclosed by the quill support 2, there is a quill 4 axially moveable in it. A stepper motor 7 in conjunction with a speed shaper 6 - both connected by a Plexibe! clutch 8 and on the. Drive unit carrier 3 mounted in each case on the outside of the outer side move the sleeve 4, including the indicator 5, axially via a rotation / translation converter, not shown,

O. , '' '''' ¹ ^ '

in the example via a Peingewinde screw drove ~ against or in front of the locally existing workpiece surface line · The indicator 5, in the example a differential transformer is after touching the workpiece by the wedge

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cutting piece into its O-position, d, h. pressed axially against the existing on-site workpiece surface line to the delivery of its Q-signal. The purpose pulses from the starting position of the indicator 5 of required number of rotation of the stepping motor 7 is stored and corresponds to the proportional measured value of the distance between the existing local _t generatrix of the workpiece and a zur'Werkzeugführung selected in the machining direction of the machine tool parallel reference line.

At the free end of the sleeve 4 - is clamped from the outside still equipped with a double tenon piece 9, where the at- the short pins 10 and 11 are fixed, which store a parallel guide and positioning unit for a prism beam pair tiltable «

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After Pig. 2, the Parallelführungs- and -Stelleinheit consists of a linear guide column 14, in the example of a round guide column, which extends on both sides of a first, the short pin 10 of the double piece 9 enclosing bearing sleeve 12 and from a center divided opposite run causing actuator spindle 151 in the example of a mittgeteilten On each extension side, the ends of the linear guide column 14 and the ^ tellführungsspindel 15 are spaced by a respective transverse yoke 16 and · 17 distance · At the transverse yoke 16 is aligned achsfluchtend to Stellstellspindel 15. a position divider 18 beasts * The Prismenwangenpaar consists of two single cheeks body 19 and 20, which for a parallel guide to each other in Stichmaßabstand the linear guide column 14 to Stellführungsspindel 15 jev / eils ei n straight-line counter-element 21, in the example in each case, a cylinder-ball guide sleeve and a positioning counter-element 22, arranged in the example a right- or "left-hand threaded bushing and fixed to connecting webs" the single cheek body 19 and 20 are parallel to each other at the same off-angle or moved by the position divider 18 by means of the rotational movement of the actuator spindle 15 in the respective actuator counter-elements 22nd

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The purpose of this from the initial position of the single cheek body 19 bzw., 20 to the uniform tangential investment of their wedge-shaped Meßs.schneiden to a respective contact .Jnit with the. Workpiece periphery required number of switching pulses to the position divider 18 is stored and stands as a proportional measurement for the Werkstückhalbjnesser.'unter maintaining the contact position of the indicator in the O position thereof in the same measuring position of the measuring device, - _ '- .-. .... .. _ · _ ...,:

The special "advantage of the measuring device and thus also the invention is the Dopperverwendung the axially movable indicator in connection with the center in the opening angle of the Prismenwangenpaares by its Winkeische itelpiuikt axially guided on a straight quill same a ^ atmi marking the distance of the workpiece periphery! selected reference line, as well as for fixing one of the three specific measuring reference points for determining the .Werkstückhalbmessers in .and the same measuring position · The simple ^ > plug-in mounting and the possible quick Yfec'Üseln the 'indicator justified serviceability with time again, achievable high accuracy · ... '''::..'';

Claims (4)

2123 5 8 Claim for invention '.' '. '.-. 1 * Method for determining the position of the rotation axis rotation. symmetrical workpieces different, in particular: large diameter on a recorded between Werkstückaufnahme- / laces and / or lunettes or Setzstöcken, / rotationsruhen or rotationsbewegten single workpiece> 'on a' machine tool using one with one of the longitudinal guide elements for the tool in the Bearbeitungsuhgsrichtung the machine tool in active connection standing measuring device which allows in a known manner the determination of a workpiece radius according to three specific Keßbezugspunkte on the circumference of the zuördenbaren workpiece ι circular cross-sectional area, "! characterized by,) that the following method steps are carried out: a) determining a proportional measurement value j of the distance between a workpiece surface line and a reference line selected parallel to the tool guide in the machining direction of the machine tool in the position of the measuring device in a: first measuring position, b). Determining and storing a proportional measured value for the Werkstückhalters3er in · also the position of the measuring device in the first measuring position using the left Antaststellung the measuring device to the J workpiece periphery when determining the propolrbionalen measured value of the distance after step a), '' - '''.''' W '.-- -V- ^:'' ^: ' c) summing the stored measured values according to the method steps according to a) and b), ·., -..... V f- d) carrying out the method steps according to a) bi ^ c) in repetition of the same in the position of the measuring device in a second or * in a further measuring position in each case selected distance in the axial direction to the first Meßpo3ition, 21 23 5 8 ^; V. e) forming the difference of the summed up hysteresis values and determining a correction value, taking into account, the. Distance in the axial direction of the respective measuring position to the first measuring position « 2 · Measuring device for carrying out the method according to point '. 1 under .Use of a known, located in a certain opening angle be prism pair and a centrally in the opening angle of the two prismatic cheeks, axially on a straight line through the v / incision vertex led quill in the centrally an axially movable indicator isVföp available. ' characterized in that. , longitudinally guided on an adaptation basic body (1) and arranged and fastened with a pinole carrier (2) and a drive unit carrier (3), the pinole carrier (2) holding the quill longitudinally moveable axially by a rotation / translation converter (US Pat. 4) coaxially surrounds and achsfluchtend thereto on the drive unit carrier (3) the front face a speed shaper (6) and the rear side a stepper motor (7), both drehbewegungsverbunden by a flexible coupling (8) is fixed, also a Doppelzapfenstück (9) the quill (4) at its peripheral free end near the indicator (5) arranged there .klemmverbunden from the outside and around both fixed short pin (10; 11) of the double pin piece (9) a parallel -... leadership and -Stelleinheit for the Prism beam pair tilting   is rotatably mounted. , 3 »measuring device according to point 2,
, characterized in that the Parallelführungs- and -Stelleinheit on both sides of a. First, a short pin (10) of the double pin piece (9) enclosing bearing sleeve (12) extends a straight guide column (14) and on both sides of a second, the other short pin (11) of the double pin piece (9) -: 'closing bearing sleeve (13) extends an initten divided opposite running actuating spindle (15) In this arrangement, the ends of each extension side are held apart by a respective transverse yoke (16, 17) and a position selector (18) is fastened at the front, 'outside on one of the transverse yokes, aligned with the adjusting spindle (15). --- -_ ^ ____ «' ^: . · 4 · measuring device according to point 2, characterized in that r ------- ....._. the Prismenwan pair consists of two Einzelv / nuchlcb'rper (19; 20), the cross-section related to the linear guide column '' (14) -. And the actuator spindle (15) each have a Geradführungs ~ counter element (21) and a Stellfülirungs counter ~ element ( .22) in the central measure from st and both guides to each other \. · ''' Arranged and fastened to connecting webs · Hserzu .._ iL $ a drawings