JPH0579412U - Ring-shaped groove diameter measuring device - Google Patents

Abstract

(57) [Summary] [Purpose] It is applied to after-gauges of grinding machines that grind rolling surfaces on the inner and outer rings of bearings. Even if the circularity is large like a thin ring product, accurate measurement can be performed. A rotating device 1 for supporting and rotating a ring-shaped product W is provided, and a plurality of openable / closable measuring terminals 2 and 3 in contact with the bottom surface of the groove of the ring-shaped product W are provided. A detector 4 such as an electric micrometer for measuring the displacement of the measuring terminal 3 is provided. The programmable machine controller 26 and the like are provided with an average value calculation means 26 for obtaining an average value of the measured values of the entire circumference measured by the detector 4 as the ring-shaped product W rotates. The feed command value of the grinding wheel 21 is corrected according to the average value calculation result.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an after-gauge for a grinder that grinds the raceways on the inner and outer races of a bearing, and a ring-shaped groove diameter measuring device used for measuring the groove diameter of other ring-shaped articles in general.

[0002]

[Prior Art]

 The grinding machine that processes the rolling surfaces of the inner and outer rings of rolling bearings measures the groove diameter with an in-process gauge, and automatically performs the processing so that the groove diameter becomes the specified value. However, the gauge may be out of the intended tolerance due to damage, wear, malfunction, or dimensional drift due to temperature characteristics.

As a countermeasure for this, a post process gauge called an after gauge is installed after the grinder to measure the groove diameter dimension of the machined work. Based on this measured value, a pass / fail judgment is made against the tolerance, and the average value of several units is calculated to find the deviation from the target point. This deviation amount is used as a correction amount, and a dimensional correction command is issued to the process gauge of the grinding machine, which is the previous process, to correct the deviation. In this way, the measured values of the aftergage are fed back to automatically monitor the dimensions.

[0004]

[Problems to be solved by the device]

 However, since the conventional after gauge only measures the groove diameter of one place once for one work, it is easily affected by the roundness. In other words, assuming that the work rigidity is low and the roundness is poor, and the amount of the work is uneven, the measured value will vary greatly depending on the measurement point when the measurement is performed at only one point. However, it is difficult to capture the true value. Therefore, incorrect measurement information will be sent to the grinder, which may cause confusion. Particularly, in the case of a bearing ring of a thin bearing whose thickness is thinner than the ring diameter, there is a large problem of measurement error due to the defective circularity. For this reason, thin wall bearings require a lot of man-hours for quality assurance, and it is difficult to improve productivity.

An object of the present invention is to provide a groove diameter measuring device for a ring-shaped product, which enables accurate measurement even if the circularity of the ring-shaped product is poor.

[0006]

[Means for Solving the Problems]

 The configuration of the present invention will be described with reference to FIG. 1 corresponding to the embodiment. The object to be measured (W) is a ring-shaped product having a circumferential groove on the inner diameter surface or the outer diameter surface. A rotating device (1) for supporting and rotating the ring-shaped product (W) is provided, and a plurality of openable and closable measuring terminals (2), (3) respectively contacting the groove bottom surface of the ring-shaped product (W). To provide. A detector (4) for measuring the displacement of the measuring terminal (3) is provided, and the average value of the average values of all the circumferences measured by the detector (4) along with the rotation of the ring-shaped product (W) is obtained. A value calculation means (26) is provided.

[0007]

[Action]

 According to this configuration, while rotating the ring-shaped product (W), the displacement of the measuring terminal (3) in contact with the bottom surface of the circumferential groove (Wa) is measured by the detector (4), and the ring-shaped product (W) is measured. ) The groove diameter is measured all around. The measurement may be performed continuously over the entire circumference, or may be measured by sampling at appropriate intervals. The average value of the measured values of the entire circumference thus obtained is calculated by the average value calculation means (26) and output as the groove diameter measured value. Since the measurement is performed over the entire circumference and the average value is used as the measured value, accurate measurement can be performed without being affected by the roundness.

[0008]

【Example】

 An embodiment of this invention will be described with reference to FIGS. FIG. 2A is a sectional view of a mechanical portion of this groove diameter measuring device. The ring-shaped product W, which is the object to be measured, serves as the outer ring of the deep groove ball bearing, and is supplied to the groove diameter measuring device A after grinding the circumferential groove Wa to be the rolling surface on the inner diameter surface. ..

This groove diameter measuring device A measures the displacement of the movable measuring terminal 3 and the rotating device 1 that supports and rotates the ring-shaped product W, the fixed measuring terminal 2 and the movable measuring terminal 3 that can be opened and closed mutually. And a detector 4 for measuring. The rotating device 1 has a horizontal rotating disc 5 and a holding plate 10 which sandwich the ring-shaped product W from each other. The rotating disc 5 has a shaft portion rotatably supported by a bearing 7 on a fixed base 6, It is rotationally driven by a motor 8 via a gear train 9. The holding plate 10 is rotatably supported by a bearing 12 on the measuring terminal support frame 11.

Each of the fixed measuring terminal 2 and the movable measuring terminal 3 has contacts 2a, 3a at the tips thereof which come into contact with the bottom surface of the circumferential groove Wa of the ring-shaped product W, and is shown from the bottom in FIG. 2 (B). As shown, the fixed measuring terminal 2 is provided with two contacts 2a, and the movable measuring terminal 3 is provided with one measuring terminal 3a. Each of these contacts 2a and 3a is made of a carbide ball or the like.

In FIG. 2A, the fixed measurement terminal 2 is provided in a fixed state on the measurement terminal support frame 11, and the movable measurement terminal 3 is attached to the fixed measurement terminal 2 so as to be openable and closable around the support shaft 13, The spring member 14 is biased in the opening direction. The movable measuring terminal 3 has an upper end in contact with a retraction cam 16 provided on the measuring terminal support frame 11 so as to be rotatable around a support shaft 15, and the rotation of the cam 16 resists the spring member 14. Can be closed.

The measurement terminal supporting frame 11 is supported by a fixed frame 17 on the upper side so as to be able to move up and down by a guide member (not shown), and is biased downward by a spring member 18, so that the biasing force of the spring member 18 is exerted. Then, the ring-shaped product W is clamped between the pressing plate 10 and the rotary disc 5. The ring-shaped product W can be attached and detached by pushing up the measuring terminal supporting frame 11 against the spring member 18 and closing the movable measuring terminal 3 by the retraction cam 16.

The detector 4 is composed of an electric micrometer, and is attached to the fixed measuring terminal 2 with a mounting member 19 so that the detector 4 a contacts the side surface of the movable measuring terminal 3. As shown in FIG. 2, the detector 4 has an amplifier 4b for performing amplification and calibration separately from the detector body.

FIG. 2 is a conceptual diagram of a grinding system in which the groove diameter measuring device A is used as an after gauge of a grinding machine. The grinder 20 has a movable spindle base 22 on which a grindstone 21 and a rotation drive device for the same are mounted so as to be movable back and forth on a bed (not shown), and is movable by a servomotor 23 via a feed screw. The advancing / retreating position of the spindle base 22 is adjusted. The ring-shaped product W is gripped at a predetermined position by a chuck (not shown) that is rotationally driven.

The control device of the grinder 20 is mainly composed of a CNC (numerical control device) 24 that performs axis control and a PMC (programmable machine controller) 25 that performs sequence control. The motor 23 is driven to control the depth of cut of the grinding wheel 21 into the ring-shaped product W by moving the movable spindle table 22 back and forth.

The PMC 25 is provided with an average value calculating means 26 for processing the measurement values obtained by the detector 4 of the groove diameter measuring device A, a comparison / determination means 27, and a reference setting means 28. The average value calculating means 26 calculates the average value of the measured values during one rotation of the ring-shaped product W, and A / D converts the analog output of the amplifier 4b to calculate the average value. The reference setting means 28 is a storage means for setting a reference value for the groove diameter. The comparison determining means 27 is means for comparing the calculation result of the average value calculating means 27 and the reference value of the reference setting means 28 and giving the difference to the CNC 24 as a correction signal b. The CNC 24 is equipped with correction means (not shown) for correcting the feed command value of the servo motor 23 by the correction signal b.

The CNC 24 is provided with a means for correcting the feed command value of the servo motor 23 based on the measured value of an in-process gauge (not shown) for measuring the groove diameter of the ring-shaped product W being processed. ..

Next, the measurement and correction operations with the above configuration will be described. The groove diameter measuring device A is supplied with a ring-shaped product W that has been groove-processed by a grinding wheel 21 of a grinder 20, and contacts 2a and 3a of fixed and movable measuring terminals 2 and 3 are circumferential grooves Wa. It is held between the rotating disk 5 and the holding plate 10 so as to contact the bottom surface of the. When the ring-shaped product W is rotated together with the rotary disk 5 by the motor 8, the contacts 2a and 3a of the measuring terminals 2 and 3 are pressed against the inner surface of the circumferential groove Wa by the biasing force of the spring member 14. However, it will move relatively in the circumferential direction in the circumferential groove Wa. Therefore, the movable measuring terminal 3 is opened and closed according to the groove diameter of each portion, and the displacement of the movable measuring terminal 3 is measured by the detector 4, whereby the groove diameter of each portion of the circumferential groove Wa is measured.

In this way, the groove diameter of the entire circumference of the ring-shaped product W is measured, and the average value of the measured values is calculated by the average value calculation means 26. The calculation result is compared with the set value of the reference setting means 28 by the comparison determination means 27, and the difference is transferred to the CNC 24 as a correction signal b, and the feed command value of the servo motor 24 is corrected by the correction function of the CNC 24. .. The comparison / determination means 27 may output the correction signal b only when it continuously exceeds the allowable value, or stores the measured values or the comparison results of several ring-shaped products W and stores them appropriately. The modified signal b may be output according to the setting standard by the statistical method of.

Since the groove diameter measuring device A measures the groove diameter over the entire circumference of the ring-shaped product W in this way and uses the average value as the measured value, it is affected by the circularity of the ring-shaped product W. Accurate groove diameter measurement can be performed without Therefore, an accurate measured value can be fed back to the CNC 24 of the grinder 20 and stable sizing control can be performed. Further, in this embodiment, the fixed measuring terminal 2 is provided with two contacts 2a, and the contacts 2a, 2a, 3a are brought into contact with three positions of the ring-shaped product W to perform the measurement. Stable measurement can be performed as compared to the case where measurement is performed by making contact with each other.

In the above embodiment, the groove diameter of the inner diameter surface of the ring-shaped product W is measured. However, the contact terminals 2a and 3a are provided on the facing surfaces of the respective measurement terminals 2 and 3, and both measurement terminals 2 and 3 are provided. The groove diameter of the outer diameter surface of the ring-shaped product W may be measured by closing and urging 3. Further, in the above embodiment, one of the measuring terminals 2 is fixed, but both measuring terminals 2 and 3 may be movable.

Further, in this embodiment, only the average value of the measured values is used as the measurement data for the position correction, but according to the groove diameter measuring device A, the perfect circle can be obtained by measuring the entire circumference. Since the degree data can also be obtained, the position can be corrected by a process in which the roundness is added to the average value.

[0023]

[Effect of the device]

 The groove diameter measuring device of this invention is provided with a rotating device for rotating a ring-shaped product, a measuring terminal in contact with the groove bottom and a detector of its displacement, and an average value calculating means, and the ring-shaped product is rotated while rotating. Since the groove diameter of the entire circumference of the shaped article is measured and the average value is calculated, the groove diameter can be accurately measured without being affected by the roundness.

[Brief description of drawings]

FIG. 1 is a conceptual diagram of a grinding machine system to which a groove diameter measuring device for a ring-shaped product according to an embodiment of the present invention is applied.

FIG. 2A is a sectional view of a mechanical portion of the groove diameter measuring apparatus, and FIG. 2B is a bottom view of a measuring terminal in the mechanical portion.

[Explanation of symbols]

1 ... Rotating device, 2 ... Fixed measuring terminal, 3 ... Movable measuring terminal,
2a, 3a ... Contactor, 4 ... Detector, 5 ... Rotating disk, 8 ...
Motor, 10 ... Holding plate, 11 ... Measuring terminal support frame,
14 ... Spring member, 21 ... Grinding wheel, 24 ... Numerical control device,
25 ... Programmable machine controller, 26 ... Average value calculating means, A ... Groove diameter measuring device, W ... Ring-shaped product

Claims (1)

[Scope of utility model registration request] 1. A groove diameter measuring device for a ring-shaped product having a circumferential groove on an inner diameter surface or an outer diameter surface, comprising a rotating device for supporting and rotating the ring-shaped product, each of which is provided so as to be openable and closable with respect to each other. A plurality of measurement terminals in contact with the groove bottom surface of the ring-shaped product, a detector for measuring the displacement of the measurement terminal, and a measurement value of the entire circumference of the ring-shaped product measured by the detector along with the rotation of the ring-shaped product. And a groove diameter measuring device for a ring-shaped product, comprising: