SE505820C2 - Method for computer-aided measurement of edge spacing preferably in rolling bearings and measuring device for carrying out this method - Google Patents

Abstract

Clearances are measured for a workpiece (16) retained between a baseplate (14) and fixed stops (15,15') placed against its outer surface (17) or inner surface (18). A calibration procedure fixes the centre point (31) whose coordinates are stored in the computer. With the workpiece (16) in position the new centre point is computed and stored, from which axial clearance is deduced with a radially movable feeler (25) and radial clearance with an axially movable feeler (32). ADVANTAGE - Distance measurements in radial and axial directions at both inner and outer surfaces can be made within narrow tolerances and automated easily.

Description

10 15 20 25 30 35 505 820 2 standing in the radial and axial directions both on the inside and also on the outside regardless of the design of the edge distance with tight tolerances and with the possibility for easy automation.

The solution of this task succeeds with the vets 1 and 2 characteristic part specified measures.

With the specified measuring procedure and with the The calculation of the movements of the measuring sensor body also takes place with regard to the position of the two appropriations relative to automatically, with the computer only when calibrating the step must be stated as to whether it is a question of inside or outside.

An embodiment of the invention will now be explained. race in more detail in connection with the attached drawings. On these shows: Fig. 1 FIG an assembly example for a ball bearing, schematically in a section, a plan view of the base plate of the measuring device, ~; the measuring point schematically during the calibration step, the measuring point schematically at the diameter compensation and the measuring point schematically during a measurement routine.

Fig. 1 shows a deep groove ball bearing 1, with 1 ' a measuring device, FIG FIG FIG (ß ßUN Fig. 6 drawn inner ring and with 1 "outer ring, which layer in the radial direction sits on the shaft 2 and in the housing 3 and in axial direction by means of the shoulder shoulder 4 and the housing shoulder 5 and shoulders 6 and 7 of spacer bushings 8 and 9 are fixed in its position. The edge sections required for correct installation the stand has been denoted by rs-radial 10 and 10 'and by rs-axial 11 and 11 '. The radial and axial edge distances determined by the largest radii rg axis 12 and rg-house 13.

In Fig. 2 and in Fig. 3 the measuring device is shown in diagram ethical way. The measuring device mainly consists of base plates. tan 14 and the two fixed stops 15 and 15 '(Fig. 3), mot which lies the specimen 16 with its outside 17 with diameters tern D or with its inside 18 with the diameter d. The two 10 15 20 25 30 35 505 820 3 the fixed stops 15 and 15 ', respectively, are arranged thereon relative to the radial reference line 19 to their tangent 20 forms a right angle to the reference line 19 and that the race centers are equally far from reference line 19 on the distance 2a (21). The fixed stops 15 and 15 'respectively designed as cylinders of equal diameter 2r (22). Both of them the diameter 22 of both fixed stops 15, 15 'and also the spacing the 21 was used for the diameter comments of the specimens 17 and 18. pension in the measurement value calculation.

Pig 2 shows a section along the reference line 19. On the base plate 14 lies the sample object 16 with its side surface 23.

On the underside of the base plate 14, the X-measuring slide 24 is arranged. which is preferably designed as a roller slide with light biasing of the rollers. By means of an application not shown here arrangement, which may, for example, be designed as a tension spring »Element or as.pressure-operated cylinder, is moved The X-measuring slide 24 in the minus-X direction when measuring so far against the test object 16 until the sensing body 25 with its rela- The base plate 14 is inclined at an angle α (26) abuts the axial edge of the chamfer 28.

The movement of the X-measuring slide 24 is sensed by a wall sensor 29 and passed on as a road signal to an unrepresented computer. The X-measuring slide 24 is thus arranged on a basic plate 14 that the measuring edge 27 of the measuring sensor body 25 at the measuring the movement in the radial reference line 19.

On the X-measuring slide 24, the Y-measuring slide 30 is arranged, which is preferably designed as a roller slide with light prestressing of the rollers. By means of an undrawn device, which for example, can be designed as a tension spring element or as compressed air operated cylinder, the Y measuring slide 30 is moved in plus-Y direction when measuring so far towards the test object 16 until the measuring sensor body 32 with its relative base plate 14 angle b (33) inclined measuring edge 34 abuts against the bevel even 28 radial edge.

The movement of the Y-measuring slide 30 is sensed by a wall sensor 35 and the path signal is forwarded to an unrepresented one computer. The Y-measuring slide 30 is thus arranged on the X-measuring slide. 505 820 10 15 20 25 30 35 4 slide 24, that the measuring edge 34 of the measuring sensor body 32 at the measuring the movement moves in the axial reference line 20, which stands at right angles to the radial reference line 19 and intersect it at the center point 31.

Fig. 4 schematically shows the calibration of the measuring device. ring. At the two fixed appropriations 15, 15 'and at the base 14, the calibration standard piece 37 is applied, which is typically designed as a cylinder with a diameter of 2 rk (38). In this position, they cut vertically and horizontally the keys of the calibration standard piece each other in the center point 31. Starting from the center point 31 with the coordination x = 0, y = 0, the two measuring edges 27 and 34 move of the measuring sensing bodies 25 and 32 during the calibration the distances x (39) and y (40), which are sensed by the associated the wall sensors 25 and 35, respectively, and are passed on to the previously mentioned computer. Road sections x (39) and y (40) are directly affected by the predetermined angles a (26) and b (33) for the measuring edges (27, 34). According to known mathematical formulas are calculated by means of the computer, which distances the sensing bodies 25 and 32 move at calibration removed from the center point 31 and used as calibration values and stored respectively.

Calibration routine Given: Calibration normal with radius rk Measuring sensor body angle in x-direction a Measuring sensor body angle in the y-direction b Setting path of the X-measuring slide x = rk * (tg a - (1 / cos a - 1)) Setting path of the Y-measuring slide y = rk * tg b - rk * (1 / cos b - 1)) - rk * (tg a - (1 / cos a - 1)) * tg b Fig. 5 shows the diameter compensation schematically way. The specimen 16 settles depending on whether it is a specimen with the outside 17 facing the outer diameter or thereabouts is a specimen with inside 18 towards the inner diameter, when measuring against the two fixed stops 15, 15 'and against the top of the base plate 14. 10 15 20 25 30 35 505 820 5 Depending on the diameter of the sample object 16, they move both sensing bodies 25 and 32 along the radial reference cleaning line 19 in the minus-X direction (for test body with inside 18) or in the plus-X direction (for test piece with outside 17), to abut without chamfering or edge spacing a sample object 16. According to mathematical formulas, plus-X- the setting paths for D (41) and minus-X-in- the position paths for d (42) are calculated at pre-given diameters 2r (22) and given distance 2a (21) for the fixed ones stops 15, 15 'and they can be stored as compensation values those in the computer. The new center points 43 for test objects with outside (17) and 44 respectively for test objects with inside (18) was used as starting points for measuring edge spacing.

Diameter compensation Given: Impact diameter with radius r Impact distance with distance 2a Exterior diameter D Inside diameter d _ 2.1 Setting path for the X-measuring slide at the outside == = fi / w -1/1 - ro / co / z + m? 2.2 Setting path for the X-measuring slide at the inside x = _4 / z- (1 -Va - -ga / (d / z - f »: 1 Fig. 6 shows a measuring routine. Based on the new one center point 43 or 44, the sensing bodies are moved 25 and 32 the measuring paths x (45) and y (46) corresponding to measuring body angles a (26) and b (33) up to their measuring edges 27 and 34 touch the test object 16 at it axial edge distance (47) with the measuring edge 27 and at it radial edge spacing (48) with measuring edge 34.

Based on the measuring distances x (45) and y (46) can the edge distances rk-radial (49) and rs-axial (50) are calculated according to known mathematical formulas. 505 820 10 15 20 25 30 35 Measurement routine Given: Measurement path in X-direction x Measurement path in Y-direction y Measuring sensor body angle in x-direction a Measuring sensor body angle in the y-direction b Calculation of the edge distance is radial rs radical = x / tg a Calculation of the edge distance rs axial rs axial = x + y / tg b Because the computer has stored it from case to case Regarding the edge distance, a SHOULD / IS comparison can be made and the result is used for continued control functions, e.g. for the CNC lathe.

Claims (2)

10 15 20 25 30 35 505 820 PATENT REQUIREMENTS Method for computer-aided measurement of edge distance, preferably in rolling bearings, characterized in that - by a calibration step the center point (31) is determined and stored in the computer, - then the workpiece (16, 17) is loaded in a pick-up device ( 14, 15, 15 ') and that the calculator calculates the new center point (43, 44) and 18) to be measured is stored in memory, - the axial edge distance rs axial (50) is determined by means of a radially displaceable measuring sensor body (25) and the radial edge distance rs radial (49) is determined by an axially displaceable measuring sensor body (32) and via wall sensors (29, 35) and their signals are transmitted to the computer - and that the edge distance is calculated by the computer with reference to the new center point (43, 44) as well as indicated. Measuring device for measuring the edge distance, preferably in the case of rolling bearing rings, wherein a pick-up device for workpieces and measuring sensors provided with a wall sensor are provided, and with a computer which evaluates and, where appropriate, indicates the road signals, characterized by , that - always a measuring sensor body (25, 32) is arranged for the radial and the axial measurement, respectively, - one measuring sensor body (32) is slidably arranged on the other, also displaceable measuring sensor body (25), the measuring edges (27, 34) of both measuring sensing bodies intersect at the center point (31) and their directions of movement are offset by 90 °, - the measuring edges (27, 34) are inclined relative to their direction of movement at an angle a (26) and b (33), respectively, - the angle of inclination a (26 ) and b (33) are smaller than the associated workpiece angle a '(51) and b' (52), - and that the computer evaluates the signals of the wall sensors (29, 35) 10 15 20 25 30 35 505 820 8 with regard to to the center point (31) and the new center points (43, 44) determined at the calibration step and indicate the signals, - the pick-up device for the workpiece consists of a base plate (14) and two stops (15, 15 '), which have equal large distance from the radial reference line (19) of one measuring sensor body (25).