JPS59136610A - Measuring device for diameter of work with large sized vertical lathe - Google Patents

Abstract

PURPOSE:To measure the diameter of a work with good accuracy and efficiency by processing arithmetically the output of an accelerometer attached to the measuring surface of the work placed on a rotary table and displaying the same. CONSTITUTION:When a start signal generator 31 is started, a reset signal is generated to reset the memories 33, 35 of an integrator A32 and an integrator B34; at the same time, a clock pulse generator 36 is actuated to start integration calculation. An accelerometer 21 attached to a work 14 transmits a tagent acceleration signal upon starting of a table 13. The signal is integrated in an integrator 32 via an AD converter 37 and a tangent speed is inputted to a memory 33, the output of which is integrated by an integrator 34 and the peripheral displacement is inputted to the memory 35. when a projection 22 faces an index detector 23, the memory 35 and a display part 49 are reset by the detection signal A and the value of the memory 35 is fed to a 1/pi device 38 by the detection signal B when the projection faces the detector in the next time. A diameter is obtd. by said device and is displayed 40 after the diameter is corrected by a corrector 39. The diameter is thus measured with good accuracy and efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for measuring the diameter of a workpiece machined with a large vertical lathe.

Conventionally, to measure the diameter of a workpiece machined on a large vertical lathe, a dedicated large micrometer was used, or blocks were placed opposite the outer diameter of the workpiece, and an inside micrometer was used between the blocks. I connected it to a meter and measured it. In the former method, the large micrometer was heavy and difficult to operate, and there were problems with accuracy. In the latter method, it was difficult to place the block accurately in contact with the workpiece, and it was also difficult to connect the inside micrometer accurately. There is also a method in which the diameter of the workpiece is calculated from the number of rotations of the roller by rotating a table that is in contact with the workpiece and pressing a roller with a known diameter against the measurement surface of the workpiece. In addition, when the roller is pressed, that part of the workpiece becomes shiny, which can be unpleasant.

The present invention has been made from this point of view, and its object is to provide an apparatus for accurately and efficiently measuring the diameter of a workpiece in a large vertical lathe.

The present invention will be explained below with reference to figures showing one embodiment. Fig. 1 (schematic view of a large earthen vertical lathe, with a table 1 rotated by a drive mechanism 12 above a bed 11)
3, and the workpiece e114 is removed in one rotation of the table. A column ] 5 stands on the left and right side of the pendo 11, and this column] 5 has a horizontal digit 16 that moves up and down.
A turret 17 that slides left and right is attached to the horizontal digit 16, and a tool (not shown) is fixed to the tip of a ram 17A of the turret 17.

The first workpiece 14 is attached to the workpiece 14 for measuring the diameter after cutting, and on the other hand, a protrusion n such as a dog or a magnet is attached to the table 13 for indexing one revolution. An indexing detector, such as a proximity switch or a magnetic sensor, is fixed to the ped 11 and cooperates with the protrusion 22. The outputs of the accelerometer 21 and the index detector O are connected to a calculation display mechanism U attached to the horizontal digit 16 and the like.

Next, details of the above-mentioned arithmetic and display mechanism U will be explained with reference to FIG. 2, together with its operation. When the start signal generator 31 is activated with the table stopped, a reset signal from the generator 31 is sent to the speed memory 33 of the integrator A 32 and the displacement memory of the integrator B 34, resetting both memories 33 and the song. Next, the integration start signal from the start signal generator 31 activates the clock pulse generator 36, so that the integrators A32 and B34 start integration operations.

Next, when the table 13 is started, the accelerometer 21 attached to the workpiece 14 sends out the tangential acceleration γi at the center of sensitivity, and this signal is converted into a digital signal by the A/D converter 37 and input to the integrator A32. This digital signal is integrated moment by moment by an integrator A32, and the tangential velocity γδ is inputted to the velocity memory 33.The output of the velocity memory 33 is received by an integrator B34, which integrates it and outputs the tangential velocity γδ to the displacement memory 35K IR(
Input the directional displacement γθ. When the protrusion 22 attached to the table 13 faces the index detector B while the table 130 is rotating, the detection signal A of the index detector 23 resets the displacement memory 35 and the display section 40.

When the rotation of the table 13 causes the protrusion n to face the indexing detector O again, the detection signal B of the indexing detector O is transferred to the displacement memory 35.
is held and the held value π is sent to the first unit 38.

The content of the displacement memory 35 is the circumferential displacement during one rotation of the table, so the circumference length, that is, the diameter x π, is 1.
After being converted into a diameter by the /π device 38, the mounting surface of the accelerometer 21 to the workpiece 14 and the sensitivity center position of the accelerometer 21 are corrected by the corrector 39, and then displayed on the display unit 40. After checking the display section 40, the table 13 is stopped and the diameter measurement of the workpiece 14 is completed. Note that the 1/π converter; 38 is provided independently;
It is possible to incorporate it into 7 as a constant, and it is also possible to incorporate it into the corrector 39.

In the present invention, the workpiece diameter measuring device for a large vertical lathe is attached to a table rotatably supported on a bed and a measuring surface of an initial workpiece placed on the table, as described above. an accelerometer attached to the table for indexing one rotation of the table; an indexing detector fixed to the four rads and cooperating with the protrusion; and A converting the analog signal of the accelerometer into a digital signal. /D converter, two integrators connected in series to convert the acceleration signal of the A/D converter into a circumferential displacement amount, and - the circumference output from the rear integrator after rotation. A 1/π device that changes the length to a diameter after one rotation, a corrector that receives the output signal of the 1/π device to correct the sensitivity center position of the accelerometer with respect to the workpiece mounting surface of the inertial accelerometer, and the corrector. The system consists of a display section that displays the output of the system.

Therefore, the measuring device of the present invention does not require the use of a large and heavy micrometer or inside micrometer, and the workpiece can simply be rotated after attaching the accelerometer to the measurement surface of the workpiece. Therefore, the present invention has the effect of making it possible to perform highly accurate measurements because the operation is extremely easy and there is little room for error.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a side view, and FIG. 2 is a mechanical diagram of the main parts. 11... Bed, 13... Table, 14... Workpiece, 21... Accelerometer, 22... Protrusion, B...
- Indexing detector, 31... A/D converter, 32, 35
...Integrator, 37...1/π unit, Seki...Corrector,
39...Display section. Applicant: Toshiba Machine Co., Ltd.

Claims (1)

[Claims] A table rotatably supported on a bed, an inertial accelerometer attached to the measurement surface of a workpiece placed on the table, and an inertial accelerometer attached to the table for immersing one rotation of the table. an indexing detector that is fixed to a protrusion and the bed and cooperates with the protrusion; an A/D converter that converts an analog signal of the accelerometer into a digital signal;
Two integrators are connected in series to convert the acceleration signal of the /D converter into circumferential displacement amount, and 1/ π device and
A corrector that receives the output signal of the 1/π converter for correcting the sensitivity center position of the inertial accelerometer with respect to the workpiece mounting surface, and a display unit that displays the output of the corrector. Workpiece diameter measuring device for large vertical lathes.