DD268426B5 - ARRANGEMENT FOR MEASUREMENT DETECTION AND CORRECTION IN THE FINAL GRINDING OF OPTICAL COMPONENTS WITH BALL-END CROP SURFACES - Google Patents

Description

adjustable, a pulse emitting key unit is coupled, the key unit is coupled via a drive controller with a transistor pulse controller for controlling the drive dos in his direction reversible Werkstückpositioniersystsms, the drive controller via a zer UaIe computer unit and a microcomputer system is controllable, the workpiece positioning from eir <? m with a clutch provided DC motor, which is connected via a Wälzschraubtrieb with a positioning slide, and the positioning slide is coupled via a position measuring system with the drive controller.

The central processing unit assumes the function of coordination, the selection of the operating mode "step" or "automatic", the evaluation of measuring results, the calculation of machine constants and machining positions, the transfer of target positions to the drive controller, the updating and display of the current actual position of the Wertstückes as well as control and monitoring functions. The drive controller makes it possible that the commands urv I instructions that go out of the central computer unit and the power transmission unit in direction of rotation and speed information for the preferably used transistor pulse controller and to convert the Weginkrementimpulse supplied by the measuring system in speed and Lageistinformationen. In the case of a position command, the DC motor actuated by the electrical contact system, that is to say by the transistor pulse controller, causes the positioning carriage, which is driven by the coupling and the rolling screw drive, on which the workpiece is located, to be moved to the required target position.

The arrangement according to the invention thus makes it possible, in a relatively simple manner, to achieve a free position, which can be carried out by subjective influences of the working force, of the optical component to be machined. About the computer control a selbstätige center thickness detection is performed in conjunction with a subsequent correction processing. Furthermore, a check of the processing result is possible at any time, with all said steps are possible both in automatic and in step mode.

embodiment

In an embodiment below, the arrangement according to the invention will be explained in more detail. To show:

Fig. 1: Overall structure in the arrangement of the probe element on the tool side directed optical functional surface Fig. 2: Tastelementanordnung directed to tool-removed optical functional surface

FIG. 1 shows the overall structure of the arrangement for measuring, processing and testing a lens-shaped optical component 1. A scanning element 2, which is arranged pivotably on a machine frame of an optical processing machine, is located in the pivoted-in position facing the optical axis of the component 1. Serves a Tasthebelschwenkeinrichtung 3. The Tasthebelschwenkeinrichtung 3 is connected via a sensing lever 4 with a sensing device 5, which generates a pulse when probing, which is forwarded to a drive controller 8. The drive controller 8, which constantly determines the current position via the connected measuring system 16, recognizes the current position of the probed functional surface 7 of the optical component 1 upon receipt of the pulse of the sensing device 5. This position position is communicated to a central computer unit 7 per position controller cycle of the drive controller 8. Via this computer unit 7, different measuring processes can be called up via keyboard input, target positions calculated automatically, and measurement results evaluated. Corrected machine constants, Positionist positions displayed and new target positions and process speeds - according to the measuring operations - are passed to the controller 8. Via a connected microcomputer control system 9, border positions or pulse releases coming from a machine 11 as well as the control commands coming from a machine operating panel 10 can be forwarded to the drive controller 8.

Furthermore, FIG. 1 shows a workpiece positioning system that can be reversed in its direction of movement, comprising a DC motor 13 provided with a coupling 12, which is connected to a positioning slide 15 via a rolling screw drive 14. The positioning carriage 15 is coupled to the drive controller 8 via a position measuring system 16. The measurement of the actual position of the provided with the optical functional surfaces 17 and 18 component can be done according to various, freely selectable measuring operations.

In a measuring process 1, the position of the optical component 1 is measured by the functional surface to be processed 17 is touched. Starting from a starting position - Positionierschlitten 15 has approached a position that positions the component 1 as far as possible away from a tool 19 - a measuring operation for touching the tool 19 facing functional surface 17 is started. In this case, first of the sensing lever 4 is pivoted so that when approaching the optical component 1, the probe element 2 hits exactly on the optical axis of the component 1. With the start of the measuring process, a positioning process is initiated, which causes the optical component 1 on there? Probe element 2 moved. Upon impact of the optical functional surface 17 on the probe element 2, after an existing game has degraded, via the sensing lever 4, a power transmission to the button unit 5 is effective. After reaching a defined (settable) operating force by opening a contact system an electrical pulse au: elöst and forwarded to the controller. 8 Upon detection of this pulse by the drive controller 8, this initiates a braking process of the workpiece positioning system. Thereupon, the direction of movement of the positioning carriage !, 15 reversed and retracted at measuring speed until the retraction pulse is triggered via the button unit 5 falls below the operating force. With the return pulse, an actual position counter is set to "zero" in the drive controller 8. Subsequently, a positioning process is called, with the η target to be positioned and held at "zero". By entering the Nullpositior. in the central computer unit 7, the calculation, that is, the definition of the processing position (grinding) takes place

Pb. = K1 + A

Pe »= processing position a

K1 = machine constant 1

A = removal

In this measurement process 1 of each measurement of the removal to be achieved in the central computer unit must be reentered. In a measuring process 2, the position of the optical component 1 is determined to the effect that the not to be processed optical functional surface 18 is touched (Figure 2).

Starting from a position of the optical component 1, which is located in the vicinity of the processing position, the probing takes place by means of an auxiliary plunger 20 through the bore of a fixing device for fixing the device 1 serving collet 21. Here, first, the optical device 1 in the vicinity of Bearbeitungspositiun, ie positioned near the tool 19. Subsequently, the Tasthebelschwenkeinrichtung 3, the sensing lever 4 is brought with probe element 2 in the same position as in measuring process 1 when probing the functional surface 17th

Calling the measuring process 2, the same positioning cycle as in the measuring process 1, only from the opposite direction. With contact between the probe element 2 and the auxiliary plunger 20, the lots between de.i individual links builds and the force increases. Exceeding the set on the key unit 5 sensing force a switching pulse is triggered and forwarded to the controller 8. The exact positioning corresponds to the positioning movements as in the first measuring process, wherein the calculation Jer processing position b in the central processing unit 7 is carried out as follows:

P _B b = K2-MD

Peb = machining position b

K 2 = machine constant 2

MD = center thickness

This measuring variant eliminates a prior measurement of the center thickness or determining the Abtrages outside the machine. To process the batch size of a particular optical component 1 only once the required center thickness needs to be entered before the start of processing the lot.

In a measuring process 3, the measurement of the center thickness takes place in such a way that after the processing of the 1st and

2. Measurement process, whereby in the second measurement process no "zeroing" of the position measuring system 16 after the gene positioning on the tactile pulse is triggered.

MD = Pm.8-K3

MD = center thickness

Pm «b = measuring position

K 3 = machine constant 3

The center thickness wii d displayed or stored by the central computer unit 7.

In a 4.Meßvorgang can be done checking the glass removal achieved. It can optionally take place after individual glass removal operations, in which the first measuring operation is changed in such a way that the measuring system 16 is not brought to "zero." The result indicated by the central computer unit 7 can be monitored by predetermined tolerance values.

To check the obtained Abtrages with simultaneous correction calculation of the machine constants, the machine constants K1 and K2 are determined and entered in the memory of the central processing unit 7 after checking the obtained Abtrages after the 4th measurement in a fifth measurement. The measured tolerance amounts are added to the machine constant as follows:

Ta = Asoii - Ai, t 11 machine KI _n = KI _n ., + Ta 12 clutch K2 "= K1 _n -K3 13 DC motor 14 rolling screw drive 15 positioning slide 16 measuring system Asoii = removal to be achieved 17 , 18 optical functional area A «= measured removal 19 Tool T _A = removal tolerance 20 auxiliary plunger 21 collet Ki _n = Mnschinenkonstante 1 (n-terValue) K2 "= machine constant 2 (nth value) K3 = machine constant 3 Compilation of the reference numbers used 1 optical component 2 probe element ? """lever steering unit 4 feeler lever 5 power transmission unit 6 transistor pulsers 7 central computer unit 8 controllers 9 microcomputer control system 10 machine operating panel

Claims (1)

Arrangement for measuring value acquisition and correction during fine grinding of optical components with spherically curved surfaces, in particular for detecting and configuring the center axis of lenticular optical components, consisting of a probe element acting on the surface of the component in the direction of the optical axis, a display unit and a workpiece positioning system for machining position correction , characterized in that the probe element (2) on the machine frame on both surfaces (17,18) of a positionally fixed optical component (1) directed in the axial direction of the component (1) stationary, via a Tasthebelschwenkeinrichtung (3) is pivoted, the probe element (2) is coupled to an adjustable, impulse emitting key unit (5), the key unit (5) is coupled via a drive controller (8) to a transistor pulse controller (6) for controlling the drive of the reversible workpiece positioning system, the An drive controller (8) via a central computer unit (7) and a Mikrorochnersteuersystem (9) is controllable, the Werkstückpositioniersystem from a clutched DC motor (13) which is connected via a Wälzschräubtrieb (14) with a positioning slide (15) consists and the positioning carriage (15) is coupled to the drive controller (8) via a position measuring system (16). For this 1 page drawings Field of application of the invention The invention relates to an arrangement for measured value detection and correction in the fine grinding of optical components with spherically curved surfaces, in particular for detecting and correcting the center thickness of lens-shaped optical components. It can be used on all optical grinding machines. Characteristic of the known state of the art Known arrangements and methods for measured value detection and correction in the fine grinding of optical components based on the fact that the workpieces are measured before and after processing and then made a correction by hand to change the Glasabtrages. The optical components are mainly removed from the machine and torn at a special test station. Furthermore, it is well known that for detecting, for example, the center thickness, between individual stages of operation of the scanning elements, which are coupled with Wegmeßsystemon be placed on the machine carriage outpatient. However, such arrangements have the disadvantage that, especially in the series processing of individual elements of the temporal testing and correction effort is very high. From metal processing it is known that in numerically controlled lathes arrangements with measuring elements are used to determine the actual positions of workpieces or tools (eg DD-PS 236031, DD-PS 240694). In such arrangements, the sensing elements are moved in the direction of the 7 u measuring component, wherein the position of the probe element is used to define the actual position and gegebent.ifalls a correction is supplied to a positioning system. However, such arrangements can not be transferred to processing units of the glass or crystal processing, since once completely different machine specifications are present and on the other predominantly rotationally symmetric parts with opposite spherical functional surfaces must be processed under consideration of special mounting and recording conditions. Object of the invention The aim of the invention is to reduce the time required for the measurement value acquisition and correction during the fine grinding of optical components with spherically curved surfaces and to improve the working conditions. Explanation of the essence of the invention The invention has for its object to develop an arrangement for data acquisition and correction in the fine grinding of optical components with spherically curved surfaces, which enables a Mittendickenmeßwerterfassung, a correction of the measured values and a constant control of the work result without subjective influences of the worker. According to the invention, the object is achieved by an arrangement consisting of a force acting on the surface of the device in the direction of the optical axis probe element, a display unit and a Werkstückpositioniersytem for processing position correction, characterized in that the probe element on the machine frame on both surfaces of a fixed-position optical component stationary over a Tasthebelschwenkeinrichtung is pivoted, the probe element with a