Classifications

• • 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
  • G01B5/20—Measuring arrangements characterised by the use of mechanical techniques for measuring contours or curvatures
  • G01B5/202—Measuring arrangements characterised by the use of mechanical techniques for measuring contours or curvatures of gears
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
  • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
  • G01B7/28—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring contours or curvatures
  • G01B7/283—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring contours or curvatures of gears

Definitions

• the invention relates to a method and a device for measuring a tooth profile, wherein a measuring probe scans the rotating tooth profile during a measuring process.
• the state of the art also includes a tooth profile measuring device in which a slide performs two translational movements.
• the gear to be tested is fixed, which results in the disadvantage of a corresponding conversion.
• the object of the present invention is to provide a method and a device of the type mentioned at the outset in which the most accurate measurement possible can be carried out in a simple manner.
• the line of engagement as the geometric location of all points of contact of the measuring key and tooth profile is a non-linear curve.
• a probe is used, which is arranged on a slide; this carriage couples two movements of the measuring head, ie the probe, namely rotation and translation.
• the slide guides can be made considerably shorter due to the combination of rotation and translation. The measuring principle with a non-linear line of action can therefore be implemented particularly advantageously using compact precision mechanics.
• Fig. 2 is a schematic, perspective view of a tooth profile measuring device
• Fig. 3 shows a measuring head K of the tooth profile measuring device.
• Fig. 1 the line of engagement E is shown, which the probe 5 scans when checking the rotating tooth profile.
• the method according to the invention is explained below using the example of involute toothing.
• the non-linear line of engagement E with respect to the rotating pole Z of the measuring device is defined by the polar coordinates r 2 and ⁇ 2 .
• ⁇ 1 angle of rotation of the polar coordinate r 1 or of the test object
• ⁇ 2 angle of rotation of the polar coordinate r 2 or of the measuring device
• FIG. 2 shows a practical exemplary embodiment of the aforementioned measuring method.
• the measuring head K shown enlarged in FIG. 3 is placed on a slide S 1 which can be moved in the Z direction.
• any end cut planes of a gear P to be tested in the present case an involute gear, can be approached.
• the measuring head K essentially consists of a slide S 3 mounted pivotably about the Z axis, and the two measuring systems 1a and 3 for determining the position coordinates r 2 and ⁇ 2 of the measuring probe 5 .
• the table T is rotatably mounted around the Z ⁇ axis to accommodate the gear wheel P. Its angle of rotation ⁇ 1 is determined by the win kelmeßsystem 4 detected, via the workpiece carriage S 2 positionable in the Y direction, the center distance can be adjusted according to the gear wheel diameter.
• the current center distance is recorded via the path measuring system 1b.
• the two axes Z 1 and Z 2 are spatially aligned in parallel via measuring and actuating elements.
• the degrees of freedom required for this are identified by F 1 .... F 3 .
• the same parallelism requirements apply to the two axes Z and Z ..
• the zero position of the angle of rotation ⁇ 1 must be determined. It is defined by the theoretical connecting line between the axes of rotation Z and Z 2 . The measurement of the right or left flank takes place symmetrically to this line, whereby only the signs for the angles of rotation are reversed.
• the coordinates of the starting position of the measuring head K must first be calculated according to the following formula:
• the gearwheel rotates continuously around the table axis Z 2 , the measuring head K or the probe 5 being tracked in accordance with the relationships (1) and (2).
• Deviations from the theoretical involute are detected by the probe 5 and can be output as usual in the form of a so-called involute diagram.
• a limiting case of the measuring method presented is when measuring rack profiles.
• the otherwise non-linear line of engagement becomes a straight line and is identical to the tooth profile.
• the measurement setup shown in Fig. 2 can also be used for flank line measurements without restrictions.
• the position numbers 1b represent the infeed movement and 1a the measurement movement with respect to the displacement measuring system Y.
• the position number 2 relates to the displacement measurement system Z, the position number 3 the angle encoder of the measuring head K, the position number 4 the angle encoder of the workpiece P.
• the angle encoders 3 and 4 and the front mentioned measuring systems connected to each other via the control and evaluation unit 6, the entire measuring process being triggered by the angle transmitter 4.
• the measuring probe 4 passes through an engagement line E, which according to FIG. 1 is designed as a non-linear curve. This results in a significant improvement in the measurement accuracy of a tooth profile in a simple manner.

Landscapes

• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Length Measuring Devices With Unspecified Measuring Means (AREA)
• A Measuring Device Byusing Mechanical Method (AREA)

Priority Applications (1)

Applications Claiming Priority (1)

Publications (1)

Family

ID=6201088

Family Applications (1)

Country Status (5)

Families Citing this family (6)

Citations (3)

Family Cites Families (2)

• 1983
  • 1983-06-09 DE DE19833320905 patent/DE3320905A1/de active Granted
• 1984
  • 1984-06-07 DD DD26391384A patent/DD219562A5/de not_active IP Right Cessation
  • 1984-06-08 JP JP59502466A patent/JPH0726839B2/ja not_active Expired - Lifetime
  • 1984-06-08 EP EP19840710020 patent/EP0131537B1/de not_active Expired
  • 1984-06-08 WO PCT/DE1984/000131 patent/WO1984004959A1/de not_active Ceased

Patent Citations (3)

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