JPH0351694Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to an apparatus for measuring a round bar-shaped product such as a mandrel used for shaping the inner diameter of a steel pipe.

(Prior Art) For example, a mandrel product 1 shown in FIG. 2 includes a cylindrical large diameter part 1a, a tapered or parallel small diameter part 1c, and a curved part connecting the large diameter part 1a and the small diameter part 1c. Or because it has a complicated shape consisting of the tapered part 1b, the outer diameter, roundness, runout (curvature)
A large number of measurement points (indicated by broken lines) are set over the entire length of the mandrel 1.

For this reason, conventionally, first, the mandrel 1 is stood upright on a surface plate with the large diameter portion 1a facing down, and the positions of the set measurement points (broken lines) are measured using a height gauge, and each measurement point determined in this way is (dashed line)
The outer diameter was measured by touching a micrometer to the surface and reading the scale. Further, when measuring the roundness and runout, the mandrel 1 is held horizontally and supported by both centers, and the measurement is carried out by reading the pointer of a dial gauge while determining the angle of the mandrel.

(Problem that the invention aims to solve) However, as mentioned above, these manual measuring instruments require a considerable amount of time and effort to measure round rod-shaped products such as mandrels, which have many measurement points and many measurement items. Moreover, there was a problem in that measurement errors were likely to occur due to misreading of the scale by the measurer.

The present invention was developed to solve the above problem, and by simply attaching a round rod-shaped product such as a mandrel between the two centers, it is possible to simultaneously measure the position of the measurement point and measure the outer diameter, roundness, and runout. It is an object of the present invention to provide a round bar-shaped product measuring device that can automatically perform measurements in a short period of time and is configured so that these measured values are displayed digitally with excellent reliability and certainty.

Hereinafter, the present invention will be explained in detail based on the drawings shown as examples.

(Means for Solving the Problems) Fig. 1 is a diagram showing an example of a round rod-like product measuring device implementing the present invention, in which a is a front view, b is a plan view, and c is a diagram of Fig. 1 a. d is a sectional view taken along the line A-A of FIG.

As can be seen in the entire figure of FIG. 1, the round bar-shaped product measuring device of the present invention has a knife edge-shaped tip 4' on the outer surface of a round bar-shaped product 1 supported on a bed 2 at both centers 3a and 3b. A measuring device 5 that digitally measures the outer diameter, roundness, and deflection of each part of the round bar-shaped product 1 by vertically contacting the carbide measuring tip 4 from above;
A carbide rod 6 whose tip 6' is in the shape of a knife edge and which abuts vertically from below at a position facing the measuring tip 4 on the outer surface is attached to the round rod-shaped product 1 along the digital scale 7 attached to the bed 2. The rod 6 is held by two vertically parallel arms 10a and 10b that project from the head 9 of a stand 8 that is movable in parallel, and the rod 6 held by the lower arm 10b is removable. Said head 9
It is characterized in that the entire structure is movable up and down by a spring 11.

That is, the round bar-shaped product 1 to be measured is
It is supported horizontally between the left and right centers 3a, 3b of the tailstocks 12a, 12b, which are disposed oppositely on the bed 2.
The distance between the two centers 3a and 3b is such that one tailstock 12a is a fixed tailstock and the other tailstock 12b is a fixed tailstock so that it can accommodate different lengths of the round bar-shaped product 1. It moves back and forth in the axial direction connecting the centers 3a and 3b, and can be fixed at a predetermined position by tightening bolts or the like. The center 3b of the movable tailstock 12b can be moved forward and backward by rotating the handle 13.
By moving the center 3b forward, the round rod-shaped article 1 is held between the two centers 3a and 3b. Further, the fixed tailstock 12a includes both centers 3
A motor 14 for rotating the round rod-shaped product 1 held between a and 3b and a digital angle indexing board 15 are built in, and the detected angle of the angle indexing board 15 is determined by a counter attached to the side of the bed 2. 16 is now displayed. Further, the center 3a and the end face 1' of the round rod-shaped article 1 are provided with a concave and convex portion (not shown) for transmitting rotation, and the rotation of the rotational drive motor 14 is caused by engagement of the concave and convex portions. The motion is transmitted to the round bar-shaped product 1, but when rotating the round bar-shaped product 1 manually without using the motor 14, the center 3a may be a general one, and the center 3a of the round bar-shaped product 1 may be rotated manually. A normal center hole may also be provided in the end face 1'.

A stand 8 equipped with a measuring device 5 for measuring the outer diameter, roundness, and deflection of a round rod-shaped product 1 has a pedestal 18 that is threadedly engaged with a screw rod 17 horizontally mounted on the side of the bed 2, and a stand 8 that is mounted parallel to the pedestal 18. Two poles standing on 19,1
9, and a head 9 slidably fitted onto the two poles 19, 19. The spring 11 fixed to the center of the lower surface of the head 9 is used to elastically support the entire head 9 on the base 18 when the fixing bolt 20 is loosened.The other end of the spring 11 has two springs. pole 1
It is fixed to the upper surface of a plate 31 fixed to the lower part of the parts 9 and 19.

By rotating the manual handle 21 of the screw rod 17, the stand 8 having the above-mentioned structure is installed between the two centers 3a and 3b.
It is possible to move left and right parallel to the
In order to shorten the time required to return the stand 8 to the measurement origin, the screw rod 17 is equipped with a screw rod driving motor 22 in addition to the manual handle 21.
is installed.

Further, an optical, magnetic, or electromagnetic digital scale 7 is attached to the side surface of the bed 2 on which the pedestal 18 of the stand 8 slides. A detector 23 is attached. The scale detector 23 is connected to a counter 24 attached to the side of the bed 2, so that the amount of movement of the stand 8 can be read digitally by the counter 24.

The head 9 of the stand 8 has an upper arm 10a whose tip extends directly above the round rod-shaped article 1, and a lower arm 10b whose tip extends directly below the round rod-shaped article 1, projecting in parallel. A digital measuring device 5 for measuring the outer diameter, roundness, and deflection of the round rod-shaped product 1 is held at the tip of the arm 10a, and a rod 6, which is a tail stock, is held at the tip of the lower arm 10b.

A digital measuring device 5 held at the tip of the upper arm 10a measures the amount of vertical movement of the measuring tip 4 brought into perpendicular contact with the outer surface of the round bar-shaped product 1 by optical, magnetic, or electromagnetic means. The detected value is digitally displayed with an accuracy of 1/1000 mm by a counter 25 installed next to the bed 2.
The measuring element 4 of the measuring instrument 5 and the rod 6 held perpendicularly to the tip of the lower arm 10b are attached so as to be located on one axis.

The rod 6 held at the tip of the lower arm 10b is attached by threading the threaded body 6'' into the screw hole 27 at the tip of the lower arm 10b and tightening the lock nut 28. By loosening 28 and rotating the rod body 6'', it is also possible to adjust the height of the tip 6' of the rod 6.

In addition, the measuring head 4 and rod 6 of the digital measuring instrument 5
In each case, the tip portions 4' and 6' which come into contact with the outer surface of the round bar-shaped article 1 are formed into a knife edge shape from a cemented carbide having excellent wear resistance.

Next, a description will be given of the operation when measuring the outer diameter, roundness, and runout of a mandrel using the device of the present invention having the above configuration.

(Function) First, the tailstock 12b is moved in accordance with the length of the mandrel 1 to be measured and fixed at a predetermined position. Next, the mandrel 1 is attached between the center 3b of the tailstock 12b and the center 3a of the fixed tailstock 12a, and the stand 8 on which the measuring instrument 5 is mounted is moved to the measurement origin (in the illustrated example) using the screw rod drive motor 22. The tip of the measuring element 4 is moved to the position of the large-diameter end 1' of the mandrel 1. At this time,
The numerical value of the counter 25 indicating the amount of movement of the stand 8 displays "0".

Then, by turning the manual handle 21 of the screw rod 17, the stand 8 is gradually moved in the length direction of the mandrel 1 from the above-mentioned origin position, and when the counter 25 displays the preset measurement point. to stop the movement of stand 8.

When measuring the outer diameter and roundness of the mandrel 1 at the above measurement location, the mandrel 1 is sandwiched between the measuring tip 4 and the rod 6 of the measuring device 5, and the mandrel 1 is rotated 360 degrees by the rotary drive motor 14. .
At this time, the fixing bolt 20 of the head 9 is loosened in advance so that the knife-edge tips 4', 6' of both the probe 4 and the rod 6 can follow the outer surface of the mandrel 1. so that it goes up and down.

The rotation angle of the mandrel 1 is displayed one after another by the angle counter 16, and the movement amount of the measuring stylus 4 according to the rotation angle is displayed one after another on the counter 25 of the digital measuring instrument 5. By comparing the values displayed on the counters 16 and 25, the roundness can be inspected, and at the same time, the outer diameter can also be determined.

Next, when measuring runout, loosen the lock nut 28 that fixes the rod 6, rotate the body 6'' of the rod 6, and attach the tip 6' of the rod to the mandrel 1.
Move further away. Then, the mandrel 1 is rotated 360 degrees by the rotary drive motor 14, and the amplitude thereof is measured by the digital measuring device 5. This measured value can also be known from the display on the counter 25.

In this way, when the measurement of one measurement point is completed, the manual handle 21 is turned again to move the stand 8 to the next measurement point.

In addition, there are three types of counters 1 installed next to bed 2.
If 6, 24, and 25 are further connected to a register 29, etc., as shown in Fig. 1b, these measurement results can be automatically printed, and the set values are stored in this register 29 in advance. If the comparison calculation circuit 30 is connected, the deviation from the measured value can also be automatically printed.

(Effects of the invention) As explained above, according to the invention, the outer diameter, roundness, etc., including the positioning of the measurement point, can be measured while the round bar-shaped product such as a mandrel is attached between both centers. Since all necessary measuring operations such as runout are performed simultaneously and automatically, the measuring time can be greatly shortened, and the number of personnel required for the measuring operations can also be greatly reduced. In addition, since all measured values are displayed digitally, there is no measurement error caused by misreading the scale as in the conventional method, and highly reliable measurement results can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing an example of the round rod-like product measuring device of the present invention, in which a is a front view, b is a plan view, c is a sectional view taken along the line A-A in Fig. 1a, and d is a B in Figure 1c
-B arrow view, FIG. 2 is an explanatory diagram of the measurement location of the mandrel. 1: Round bar-shaped product (mandrel), 2: Bed,
3a, 3b: Center, 4: Measuring point, 5: Digital measuring device, 6: Rod, 7: Digital scale,
8: stand, 9: head, 10a, 10b: arm, 11: spring, 16, 24, 25: counter.

Claims (1)

[Scope of utility model registration request] A carbide probe 4 with a knife-edge tip is vertically brought into contact with the outer surface of the round rod-shaped article 1 attached between the left and right centers 3a and 3b on the bed 2 from above, and the outer surface of each part of the round rod-shaped article 1 is touched vertically from above. A measuring device 5 for digitally measuring diameter, roundness, and runout, and a carbide rod 6 having a knife-edge tip that abuts vertically from below at a position opposite the measuring tip 4 on the outer surface of the round rod-shaped product 1. , vertically parallel 2 projecting from the head 9 of a stand 8 which is movable parallel to the round bar-shaped product 1 along the digital scale 7 attached to the bed 2.
are held by book arms 10a and 10b, respectively,
A round rod-shaped product measuring device characterized in that the rod 6 held by the lower arm 10b is removable, and the entire head 9 is configured to be movable up and down by a spring 11.