JPH07159103A - Measuring device of eccentricity and cylindricity of long size round bar - Google Patents

Abstract

PURPOSE:To provide a measuring device for eccentricity and cylindricity of a long size round bar with excellent measuring accuracy and little variation of measuring conditions. CONSTITUTION:A pair of first rolls 3 as support rolls and a pair of second rolls coaxial with the first rolls 3 are installed on a surface plate 2, and a guide rail 5 is installed in parallel to the first rolls 3 and second rolls 4. The guide rail 5 is slidably provided with a slide mechanism 6 which is equipped with a measuring probe 7 and a dial gage 9. In this way, eccentricity and cylindricity of a long size round bar can be measured with high accuracy and without variation of measuring conditions. Also, measuring accuracy of the eccentricity and cylindricity can be excellently maintained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for measuring eccentricity and cylindricity of a long round bar, and more particularly to a device for measuring eccentricity and cylindricity of a long round bar which has good measurement accuracy and less variation in measurement conditions.

[0002]

2. Description of the Related Art A long round bar such as a boring bar is required to have good cylindricity with little eccentricity with respect to the central axis. Therefore, it is necessary to measure whether the eccentricity and the cylindricity of each long round bar are within a predetermined range.

FIG. 4 shows such a conventional eccentricity and cylindricity measuring device. In FIG. 4, the measuring device 41 has a fixed plate 42.
And a flat plate-shaped bearing stand 43, 43A having a pair of V-shaped grooves installed on the plate 42, a magnet clamp 45 installed on the plate 42 so as to be movable in the axial direction, and the magnet. A dial gauge 44A provided with a clamp 45 and provided with a measuring probe 44 suspended between the bearing stands 43, 43A.
The operation is that the long round bar 46 is placed in the V-shaped groove of the bearing pedestals 43, 43A, and the tip of the measuring probe 44 is attached to the outer peripheral surface of the long round bar 46. The long round bar 46 is rotated with a hand or the like in a state of being brought into contact with the predetermined position of the above, and the eccentric amount is read by the dial gauge 44A. By repeating this operation while sequentially moving the magnet clamp 45 in the axial direction, the eccentricity and cylindricity of the long round bar 46 are measured, and those exceeding the predetermined eccentricity are recognized as defective products.

[0004]

In the above-mentioned conventional eccentricity and cylindricity measuring device 41, the magnet clamp 45 needs to be moved every time the measuring position of the long round bar 46 is changed. There is a problem in that it is extremely difficult to always bring the measuring probe 44 into accurate contact with the center of the rod 46. In addition, it is difficult to measure the eccentricity and cylindricity of each long round bar 46 under the same conditions. Further, in the above-mentioned conventional technique, the bearing base 4 having the V-shaped groove is used.
Place the long round bar 46 on 3, 43A, and use the bearing stand 43, 43A.
Since this is rotated above, the bearing bases 43, 43A
There is also a problem that the measurement conditions change with the wear of the.
In particular, when the bearing bases 43, 43A are unevenly worn, the reliability of eccentricity and cylindricity measurement decreases.

Therefore, in order to suppress the degree of wear of the bearing pedestals 43, 43A and improve the accuracy, as shown in FIG.
It is conceivable to use the block 51 and place the long round bar 46 there. However, since the accuracy of such a long V block 51 is not stable, the long V block 51 is used as a reference plane. There is a problem that the eccentricity and the cylindricity are not accurate even if they are measured. Further, since it is necessary to move the magnet clamp 45 each time the measurement position of the long round bar 46 is changed, as in the case of the pair, the measuring probe 44 is always brought into accurate contact with the center of the long round bar 46. There is a problem that it is extremely difficult to do so.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an eccentricity and cylindricity measuring device for a long round bar, which has good measurement accuracy and less variation in measurement conditions. .

[0007]

SUMMARY OF THE INVENTION The present invention provides an apparatus for measuring eccentricity and cylindricity by rotating a long rod while contacting a measuring probe to the outer peripheral surface of the rod. The device is a fixed plate, at least a pair of support rolls of the long round bar installed on the fixed plate, a guide rail provided in parallel with the roll, and slidably installed on the guide rail. The slide mechanism, the measuring probe attached to the sliding mechanism, and the measuring means connected to the measuring probe.

[0008]

In the apparatus for measuring the eccentricity and cylindricity of the long round rod of the present invention, the long round rod is placed on at least a pair of support rolls, and the tip of the measuring probe is attached to the long round rod. The aforesaid long round bar is rotated by a hand or the like in a state of being brought into contact with a predetermined position on the outer peripheral surface of the measuring means, and the vertical movement of the measuring probe along the undulation of the outer circumference of the long round bar is measured. Read with. By repeating this operation by sliding the slide mechanism along the guide rail parallel to the longitudinal direction of the long round bar, the cylindricity can be measured with high accuracy without fluctuation of the measurement conditions. Further, since the bearing table for mounting the long round bar is a pair of rolls, the long round bar can be smoothly rotated, and there is no friction between the roll and the long round bar. Further, the roll is not worn, and the measurement accuracy of the eccentricity and the cylindricity can be kept good.

[0009]

An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a front view showing an eccentricity and cylindricity measuring device 1 for a long round bar of the present invention, FIG. 2 is a plan view, and FIG. 3 is a side view. An eccentricity and cylindricity measuring device 1 for a long round bar of the present invention comprises a steel constant plate 2 and a pair of first rolls 3, which are support rolls for the long round bar installed on the constant plate 2. A pair of second rolls 4 provided coaxially with the first roll 3 at a predetermined interval, and guide rails provided parallel to the axes of the first roll 3 and the second roll 4 at a predetermined interval. 5, a slide member 6 which is a slide mechanism is slidably fitted onto the guide rail 5 at the lower portion thereof, and a measurement probe is provided at the tip of the slide member 6 at the upper end thereof. A support member 8 having 7 is attached. In addition, the support member 8 has a dial gauge 9 as a means for measuring eccentricity and cylindricity.
Is installed and connected to the measurement tentacle 7. In the measuring device 1, the pair of first rolls 3 is one in which a roll 11 is rotatably attached to a U-shaped fixing member 10 and the pair of rolls are fixed to the fixed plate 1 so as to face each other. ,
The second roll 4 is also composed of the same member.
Further, the slide member 6 has a slide bearing (not shown) in a sliding portion with the guide rail 5. Reference numeral 12 is a bolt for axially mounting the roll 10, 13 is a holding member, and 14 is a pin for fixing the support member 8 to the slide member 6.

Next, the operation of the above configuration will be described. First, the long round bar 15 is placed between the rolls 10 of the first and second rolls, the slide member 6 is slid to one end of the long round bar 15, and the measuring tentacle 7 is moved to the long round bar. Abut the outer peripheral surface of 15. Next, when the other end of the long round bar 15 is gripped with a hand or the like and rotated in the direction of the arrow in FIG. 3, the pair of first rolls 3 and second rolls 4 are rotated, and the long round bar is rotated. The rod 15 rotates smoothly. At this time, the measuring probe 7 moves up and down along the undulations of the outer circumference of the long round bar 15. The vertical movement of the measuring probe 7 is transmitted to the dial gauge 9 by a transmission mechanism (not shown) and displayed. The eccentricity is defined as 1/2 of the difference between the maximum value and the minimum value of the displayed values. For the cylindricity, the slide member 6 is slid from one end side to the other end side, and the above-mentioned operation is repeated to measure the undulation of the outer circumference of each part of the long round bar, and the dial gauge 9 at this time is displayed. It is calculated from each value by the method of least squares or the like.

The eccentricity and cylindricity measuring device 1 for a long round bar of the present invention as described above has a constant plate 2, a pair of first rolls 3 as support rolls installed on the constant plate 2, and the above-mentioned. A pair of second rolls 4 installed coaxially with the first roll 3.
A guide rail 5 provided in parallel with the first roll 3 and the second roll 4, a slide mechanism 6 slidably installed on the guide rail 5, and a measurement device attached to the slide mechanism 6. It is provided with a tentacle 7 and a dial gauge 9 connected to the measuring tentacle 7, and a long round bar 15 is placed on the pair of the first roll 3 and the second roll 4 for measurement. The long rod 15 is rotated with a hand or the like while the tip of the probe 7 is brought into contact with a predetermined position on the outer peripheral surface of the long rod 15, and the length of the measurement probe 7 at that time is increased. The vertical movement of the outer circumference of the round bar 15 along the undulations is read by the measuring means. By repeating this operation while sliding the slide mechanism 6 along the guide rail 5 parallel to the longitudinal direction of the long round bar 15,
It is possible to measure the cylindricity with high accuracy without changing the measurement conditions. Further, since the bearing base on which the long round bar 15 is placed is the pair of rolls 3 and 4, the long round bar 15 can be smoothly rotated, and furthermore, the rolls 3 and 4 and the long round bar 15 can be rotated. Since there is no friction between the rolls 3 and 4, the rolls 3 and 4 are not worn, and the eccentricity and cylindricity measurement accuracy can be maintained at a good level.

The present invention has been described above with reference to the accompanying drawings. However, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention. For example, the long round bar 15 capable of measuring the eccentricity and the cylindricity by the device 1 of the present invention is not particularly limited as long as the outer peripheral surface is basically circular, and various shapes such as a cylindrical shape and a tubular shape are applied. It is possible. Further, the outer peripheral surface does not need to be circular over the entire length of the work (measurement object), and at least the outer peripheral surface of the portion placed on the first roll 3 and the second roll 4 may be circular. Further, the size of the plate 2, the diameter of the rolls 3, the distance between the rolls, the distance between the rolls 3 and 4, and the like can be appropriately changed according to the length and diameter of the long round bar. Further, the pair of rolls supporting the long round bar need not be two sets as in the present embodiment, and may be three sets or more or one set as long as it is a long roll. Also, the fixing member for the roll 11
The bearing used for the shaft attachment to 10 and the slide member 6 is not limited to the ball bearing and the slide bearing, and an appropriate bearing can be appropriately selected and used. It may not be used if it has sufficient sliding characteristics without a bearing.

[0013]

The eccentricity and cylindricity measuring device for a long round bar of the present invention is configured to rotate by rotating the long round bar while contacting the measuring probe to the outer peripheral surface of the long round bar. In a device for measuring the eccentricity and cylindricity of a round bar, the device is a fixed plate, a support roll of at least a pair of the long round bar installed on the fixed plate, and provided in parallel with the roll. A guide rail, a slide mechanism slidably installed on the guide rail, a measurement tentacle attached to the slide mechanism, and a measurement means connected to the measurement tentacle. , Placing the long round bar on the support roll, and holding the long round bar in a state in which the tip of the measurement probe is brought into contact with a predetermined position on the outer peripheral surface of the long round bar. Rotate by, and measure the vertical movement along the undulation of the outer circumference of the long rod of the measuring probe at that time Read by the stage. By repeating this operation while sliding the slide mechanism along the guide rail parallel to the longitudinal direction of the long round bar, the cylindricity can be measured with high accuracy without fluctuation of the measurement conditions. Further, since the bearing base for mounting the long round bar is a pair of rolls, the long round bar can be smoothly rotated, and there is no friction between the roll and the long round bar. Therefore, the roll is not worn, and the eccentricity and cylindricity measurement accuracy can be kept good.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of an eccentricity and cylindricity measuring device of the present invention.

FIG. 2 is a plan view showing an embodiment of the eccentricity and cylindricity measuring device of the present invention.

FIG. 3 is a side view showing an embodiment of the eccentricity and cylindricity measuring device of the present invention.

FIG. 4 is a perspective view showing a conventional eccentricity and cylindricity measuring device.

FIG. 5 is a perspective view showing another example of a conventional eccentricity and cylindricity measuring device.

[Explanation of symbols]

 1 Eccentricity and cylindricity measuring device 2 Fixed plate 3 1st roll (supporting roll) 4 2nd roll (supporting roll) 5 Guide rail 6 Sliding member (slide mechanism) 7 Measuring tentacle 9 Dial gauge (measuring means) 15 Long round bar

Front Page Continuation (72) Inventor Mori Horiuchi 1-3, Koganecho, Niigata City, Niigata Prefecture Mitsubishi Materialial Co., Ltd. Niigata Works

Claims (1)

[Claims] 1. An apparatus for measuring eccentricity and cylindricity by rotating the long round bar while bringing a measuring probe into contact with the outer peripheral surface of the long round bar, wherein the device is a fixed plate,
At least a pair of support rolls of the long round bar installed on the plate, guide rails provided parallel to the rolls, a slide mechanism slidably installed on the guide rails, and the slide An eccentricity and cylindricity measuring device for a long rod, comprising: a measuring probe attached to the mechanism; and a measuring means connected to the measuring probe.