SU1402800A1 - Method and apparatus for measuring linear dimensions of objects of bodies of revolution type - Google Patents

Abstract

The invention relates to a measurement technique and can be used, for example, in devices for the active control of diameters on lathes. The aim of the invention is to improve the measurement accuracy. The transducers 1, 2 move in the direction of the axis of the product being monitored. The signals from transducers 1, 2 are fed to measurement blocks 3, 4, converted into digital form in analog-to-digital converters 5, 6, and stored in buffer blocks 7, 8 of memory. Measurement mode control is performed using serially connected preset 9, generator 10 clock pulses and reversible counter 11. Mini search unit 13 controls the operation of switch 12. Measurement cycles continue until the axis of converter 2 crosses the axis of rotation of the object. In this case, in the memory block 14, the measurement result of the displacement transducer 1 is recorded. Computing unit 15 calculates the radius of the item being monitored, which is recorded in block 16 of registration. 1 h. item f-ly, 2 ill. SS (L

Description

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The invention relates to a measurement technique and can be used, for example, in devices for the active control of diameters on lathes.

The purpose of the invention is to improve the measurement accuracy by eliminating base error.

FIG. 1 is a diagram illustrating the measurement method; in fig. 2 - block diagram of the device that implements the method.

The method for measuring the diametral dimensions is as follows (Fig. I).

Measuring transducers 1 and 2 are set so that their axes are mutually perpendicular, the transducers are spaced apart from each other, measured between the end of the first transducer and the axis of the second. The transducers are moved along the axis of the transducer 1 with feed S (mm / min) in the direction of the axis of rotation of the object under test, rotating at a frequency n (rpm), and the gap b | between the transducer 1 and the object TO.V1 at the time of the minimum gap bz between the transducer 2 and the object, i.e. when the axis of the transducer 2 crosses the axis of rotation of the object. Thus, the positioning error of the transducer 1 relative to the object being monitored is eliminated. The radial size g of the object is determined from the ratio

,

where / is the distance between the end of the first converter and the axis of the second;

b | - the gap between the first transducer and the object.

When multiple gaps are measured in one revolution of the object being monitored, data can be obtained for constructing a circular pattern of the measured section of the object.

A device that implements the method (Fig. 2) contains measuring transducers 1 and 2, spacing 1, located on the clamping unit (not shown) in such a way that their axes are mutually perpendicular and pass through the axis of the product being tested. Measuring converters I and 2 are connected to measurement units 3 and 4, respectively, and analog-to-digital converters 5 and 6 are connected to the outputs of the latter, which in turn are connected to memory buffer blocks 7 and 8.

The device also contains serially connected preset node 9, a clock generator 10, a reversible counter 11. The outputs of the buffer blocks 7 and 8 of the memory are connected to the first and second inputs of the switch 12, respectively, the fourth input of the switch 12 is connected to the output of the minimum search block 13, the input of which is connected to the second output of the first buffer memory unit 7. The output of the reversible counter 11 is connected to the third input of the switch 12. To the output of comm0

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The controller 12 is connected to a chain of series-connected memory unit 14, computing unit 15, registration unit 16.

The device works as follows.

Before the measurements are started using the preset node 9, the frequency / generator of 10 clock pulses and the number of pulses .V of the reversing counter 11 are set equal to the number of measurements of the gaps per revolution

0 objects. Frequency / generator 10 is determined by the ratio

- pn g-

where n is the frequency of rotation of the object, rpm.

 The indicated frequency / must be less than the maximum possible frequency of operation of analog-digital converters 5 and 6. The measurements are carried out simultaneously by contactless converters 1 and 2 as they move with feed S relative to the object. At the same time, at the outputs of blocks 3 and 4, the voltage levels corresponding to the current values of the gaps b | and 62- Generator 10 with a frequency / gives pulses to the control inputs of analog-digital converters 5 and 6 and to the input of a reversible counter 11. At each clock pulse, analog signals are received from blocks 3 and 4 of measurement to analog-to-digital converters 5 and 6, where digitized. The digital information from the analog-digital converter 5 is fed to the buffer memory unit 7 and the minimum search unit 13, and from the analog-digital converter 6 information is fed to the buffer memory unit 8. When an object rotates, each measurement cycle is performed for each revolution. In this case, in the buffer blocks 7 and 8, the memory is accumulated by N values of gaps b2 and b |, and in block 13 of the minimum search, the minimum value of the gap 62 is determined

0 for the current turnover of the object, which is compared with the minimum value of the gap 62 obtained during the previous measurement cycles. At the end of each measurement cycle from the output of the reversible counter 11, the enable signal is supplied to the switch 12. Switch 12 connects the outputs of the buffer memory blocks 7 and 8 to memory block 14 in the case that the enable signal from search block 13 also arrives at the input of the switch 12 minimum. The minimum search unit 13 generates a resolution signal under the condition that the minimum value of the gap 62 for the current object turn will be less than the minimum value of the gap 62 obtained in the previous measurement cycles. Simultaneously with the overwriting of information from the buffer blocks 7 and 8 of the memory into the memory block 14, the minimum value of the gap 62 in the minimum search block 13 is updated. Measurement cycles continue.

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until the axis of the transducer 2 deliberately crosses the axis of rotation of the object. As a result of the measurements, in the memory block 14, the values of the gaps 6i and 62, measured during one revolution of the object with the smallest gap between the transducer 2 and the object, will remain, which corresponds to the minimum error of the measuring device. According to the obtained values of gaps 6i and 62 in the computing unit 15, the diameter is determined where /

the distance between the end face of the converter, the axis of which coincides with the direction of movement of the measuring system, and the axis of the second converter;

b - measurement result of the second converter.

2. A device for measuring the linear dimensions of objects such as bodies of revolution, which contains two contactless measuring dimensions of an object: the radii of an object, a Young converter, two measuring units.

at each measurement point, the minimum and maximum diameters d, nin and d, nax, deviation parameters from roundness. The results of the calculations come in block 16 registration

each of which is connected to a corresponding measuring transducer, a recording unit, characterized in that, in order to improve the measurement accuracy, it

which can be made in the form of digital-with two analog-digital pre-printing device, display, grapho- -

builder, etc.

Claims (2)

Invention Formula Developers whose inputs are connected to the outputs of the respective measurement units, two buffer memory blocks connected to the outputs of the corresponding analog-to-digital converters, comp. 1. A method for measuring linear dimensions 20 by a mutator, the first two inputs of subobjects of the type of rotation bodies, consisting in that the measuring system is positioned perpendicularly to the axis of the product under test, move it towards the axis of the product under test, measure the moment of passage of the measuring transducer by the transmitter oh system centreline controlled article to said time count t derivatives of controlled size. connected to the outputs of the buffer memory blocks, a chain of series-connected preset, clock generator, reversible counter, the output of which is connected to the third input of the switch, the second and third clock generator outputs are connected to the second inputs of the first and second analog-to-digital converters, minimum search block, input characterized in that, in order to increase the first connected to the second output measurement accuracy due to the exclusion of the base error; two measuring transducers, the axes of which are mutually perpendicular and passing through the axis of the product under test, are used as the measuring system; the measurement system moves to the axis of the product under test along the axis of one of the measurement transducers diametral plane controls a buffer memory block, an output to the fourth input of the switch, a memory block connected to the output of the switch, a computing unit connected to the output of the memory block, non-contact measuring transducers are located on a base node that is two mutually connected perpendicular levers located in a plane perpendicular to the axis of the product being tested, so that the axes of the measuring convertible product are determined by the minimum of 40 formers mutually perpendicular the transducer's signal, set perpendicular to the direction of movement of the measuring system, and the radial size of the tested product is determined from the ratio . and pass through the axis of the monitored product, based the node out, 1nen with the ability to move in the direction of the axis of one of the measuring transducers, and the registration unit is connected to the computing unit. 02800 where / four the distance between the end face of the converter, the axis of which coincides with the direction of movement of the measuring system, and the axis of the second converter; b - measurement result of the second converter. 2. A device for measuring the linear dimensions of objects such as rotating bodies, containing two non-contact measuring transducers, two measuring units. each of which is connected to a corresponding measuring transducer, a recording unit, characterized in that, in order to improve the measurement accuracy, it connected to the outputs of the buffer memory blocks, a chain of series-connected preset, clock generator, reversible counter, the output of which is connected to the third input of the switch, the second and third clock generator outputs are connected to the second inputs of the first and second analog-to-digital converters, minimum search block, input o connected to the second output of the first a buffer memory block, an output to the fourth input of the switch, a memory block connected to the output of the switch, a computing unit connected to the output of the memory block, non-contact measuring transducers are located on a base node that is two mutually connected perpendicular levers, located in a plane, perpendicular to the axis of the controlled product, so that the axes of the measuring instruments are mutually perpendicular and pass through the axis of the monitored product, based the node out, 1nen with the ability to move in the direction of the axis of one of the measuring transducers, and the registration unit is connected to the computing unit. 1