Classifications

• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
  • G01B11/00—Measuring arrangements characterised by the use of optical techniques
  • G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
  • G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
  • G01B5/003—Measuring of motor parts
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
  • G01M13/00—Testing of machine parts
  • G01M13/005—Sealing rings

Definitions

• the invention relates to a method for measuring the contour of a piston provided with a shock generated non-round.
• Piston ring which should have a round contour in the engine operating condition, compared to a surrounding cylindrical sealing surface as possible be performed light gap.
• piston rings were compressed to check this Lichtspaltdense or the radial pressure, for example by means of a clamping band and then checked the remaining radial gap between the outer peripheral surface of the piston ring and the clamping band or the radial pressure determined.
• the invention has for its object to provide a method for measuring the contour of a provided with a shock non-rotatably produced piston ring, with which damage to be measured piston ring can be reliably avoided and thus the rejection can be reduced compared to the prior art.
• This object is achieved on the one hand by a method for measuring the contour of a shock-provided non-round piston ring produced by an open
• Piston ring placed on a rotatable body, at least one of the peripheral surfaces of the open piston ring is scanned contactless in the course of the rotational movement of the body, the measured values are stored in a data processing system and adjusted with predetermined stored contour reference values.
• Piston ring receiving turntable and at least one non-contact measuring device wherein at least one of the peripheral surfaces of the open piston ring for detecting the contour of the respective peripheral surface on the at least one measuring device in the course of the rotation of the turntable mecanickelbar is.
• the measured values of the second measurement can be compared at least with those of the first measurement. If here, too, no deviations from the intended contour are determined, this piston ring is now ready to be further processed. Supplementary measurements of the light gap tightness or the radial pressure by radially compressing the non-circularly produced piston ring are therefore unnecessary.
• the piston ring which is produced in particular by winding, is deposited on an electrically driven precision rotary table and roughly aligned. Opposite this there is at least one laser, which in the course of the rotation of the turntable scans the contour of at least one of the circumferential surfaces, in particular the outer peripheral surface of the piston ring, in a non-contact manner.
• the at least one laser sits on a precision guide in order to adjust the laser to the respective distance to the piston ring can.
• the correct distance is displayed in a measuring program.
• the measurement results can be displayed on a monitor, can be
• Figure 1 schematic diagram of the inventive method for measuring the contour of a non-circular piston ring
• Figure 2 Schematic diagram of a winding and measuring a non-round
• FIG. 1 shows a schematic diagram of a measuring device 1, comprising a base body 2, which receives a drive element 3.
• the main body 2, respectively the drive element 3, is provided for receiving a precision turntable 4.
• the main body 2 furthermore accommodates a non-contact measuring device 5, which in this example should be formed by a single precision laser.
• the laser 5 is provided at a predeterminable distance from the turntable 4.
• a shock 6 piston ring 7 is to be measured.
• the outer peripheral surface 8 of the piston ring 7th is measured from its contour.
• the unstressed, ie open piston ring 7 is placed on the turntable 4 and roughly aligned.
• the laser 5 is advantageously adjustable in the longitudinal and transverse directions (see arrows), so that also different high and different diameter from the piston rings 7 can be measured.
• the measured values determined by the laser 5 are made available to a data processing system DV and compared with the contour reference values stored in same.
• the data processing device DV is in this example in operative connection with a display device 9, which reflects a graphical representation 10 of the measured circumferential surface 8. Only hinted is the
• the measured unrestrained piston ring 7 can be used for the further processing or assembly step, for example a heat treatment.
• this piston ring 7 is subjected to a renewed measuring process, whereby here too the open-loop, i.e. unstrained
• Piston ring 7 measured values are at least compared to those of the first measurement process. If the measured values are also within tolerance range T, piston ring 7 can be further processed or installed in the engine.
• Figure 2 shows a schematic diagram of a practical application of the
• the subject matter Shown is the turntable 4, which receives the piston ring 7 and the laser 5 and the data processing device DV. Visible is the shock 6 of the piston ring 7. The turntable 4 is after coarse alignment of the
• Piston ring 7 is scanned contactless. Here, too, a comparison between the measured contour values and the contour reference values takes place, which in the
• Data processing device DV are stored.
• the Data processing device DV with a piston ring winding device 11 (only indicated) in operative connection.
• the piston rings 7 are wound out of round from the endless material 12 via winding rollers 13 according to their required diameter and in the region 14, for example by a cantilever blade (not shown) cut off from the continuous material 12.
• a radially adjustable body 15 is provided, which can be positioned in the region of the inner and / or the outer circumferential surface of the wound piston ring 7.
• the body 15 may also be formed as a role as needed.
• the body 15 influences the degree of out-of-roundness of the piston ring 7 to be wound. If the contour measurement result determined by the laser 5 is outside the tolerance T, the winding process is influenced directly by the fact that correction values are transmitted to the body 15 and the tolerance deviations

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

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Cited By (3)

Citations (5)

Family Cites Families (5)

• 2011
  • 2011-12-08 DE DE102011120590A patent/DE102011120590A1/de not_active Ceased
• 2012
  • 2012-12-01 WO PCT/DE2012/001148 patent/WO2013083108A1/de active Application Filing

Patent Citations (5)

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