RU2767709C1 - Comparator for checking plane-parallel gauge blocks - Google Patents

Abstract

FIELD: metrology.SUBSTANCE: comparator for verification of plane-parallel gauge blocks relates to the field of metrology, in particular to devices for metrological verification of plane-parallel gauge blocks, and can be used not only for calibration of gauge blocks of nominal length from 0.5 to 100 mm, but also nominal length from 0.1 to 0.5 mm. For this purpose, the comparator is additionally equipped with a removable cassette for locating measures, which is a flat plate made of optical glass, on the surface of which on the side of the upper transducer there are channels connected through the locking unit and the receiver to the vacuum pump, at the same time the surface of the cartridge on the side of the lower transducer is hollow.EFFECT: broader functional capabilities due to wider range of nominal lengths of measured gauge blocks.1 cl, 2 dwg

Description

The invention relates to the field of metrology, in particular, to devices for metrological verification of plane-parallel end gauges, and can be used not only for checking end measures of length (KMD) of nominal length from 0.5 to 100 mm, but also of nominal length from 0.1 to 0.5 mm.

Known comparators for checking plane-parallel gauge blocks of length, for example, from TESA (https://galika.ru/wp-content/uploads/2013/07/L_2010.pdf - TESA Catalog, p. 9), containing a measuring rack, a massive structure with toothed guide and handwheel for moving, as well as an integrated holder and a device for precise setting of the upper probe. The comparator also contains a special measuring table, a massive measuring table with 6 cylinder pins to support and protect the end measures during their use, two length measurement sensors - special inductive axial probes TESA GT 22 with pneumatic withdrawal of the measuring rod. Adjustment using the resistances available on each probe. Movement of the measuring rod ±150 µm. Measuring force ≈1 N (upper probe A) or ≈0.63 N (lower probe B).

The disadvantage of the known comparator is the inability to verify thin CMD with a nominal value of 0.1 to 0.5 mm.

A comparator is also known for checking and calibrating end plane-parallel measures of length (Pribory-Si catalog, https://pribory-si.ru/catalog/pribory-dlya-poverki-mer-dliny-kontsevyldVkomparator-emp consisting of: a granite slab with a special table made of hardened steel Five horizontal cylindrical carbide pins are located on the surface of the table, which form a plane for the location of gauge blocks, a guide with a movement device, two measuring probes: an inductive probe and a high-precision incremental linear transducer with a measuring range of 25 mm, a vacuum pump, automatically operating the inductive probe PEKAL 32 software that manages the measurement process and processes the measurement results The device allows two methods of measurement: the direct evaluation method and the differential method ia (+A+B), allow measurements, while the movement of the measuring rod and the creation of a measuring force are carried out using a servo probe. Two temperature sensors allow in the current mode to control the temperature of the reference and calibrated end plane-parallel length measures. The software allows you to: automatically clamp the measuring probes; evaluate the quality of the measurement in terms of scope at each verified point of the measure; prompt the verification sequence to the verification; show on the display: the nominal size of the measure, the scheme of verified points, the setting for the nominal size, the ambient temperature, all values of the verified measure; recalculate the deviations of the verified measure, taking into account corrections for the reference; print the protocol of measurements; keep in memory all the actual values of the measures of exemplary sets until the next certification, control the temperature regime of the reference and verified measures, automatically calculate the correction factor for the error in thermal expansion and take it into account in the measurement results.

The disadvantage of the known comparator is also the inability to verify thin CMD with a nominal value of 0.1 to 0.5 mm.

The closest of the known analogues to the claimed comparator for checking plane-parallel end measures of length is the "Installation for verification of end measures of length UKM-100" (Catalogue of Engineering and Metrology Center "MICRO" LLC, http://imcmikro.ru/), containing a measuring table with a rigidly fixed granite base, on which a column is vertically mounted, fixed on the reverse side of the granite base with a rod, bottom bracket and nut, the upper bracket is fixed on the column with the ability to move along it above the granite base, while each bracket is equipped with a measuring module feed mechanism , installed in a cylindrical housing with a vacuum caging system and the corresponding upper or lower inductive sensor, while the said inductive sensors are connected to the corresponding inputs of the display unit connected to the computer output and to the input of the caging block, and the vacuum caging system of the corresponding upper and the lower inductive sensor is connected through the caging block to the vacuum pump.

The technical result achieved by the invention is to expand the functionality of the comparator for checking plane-parallel gage blocks by expanding the range of nominal lengths of the measured gage blocks.

The claimed technical result is achieved in a comparator for checking plane-parallel end measures of length due to a removable cassette, which is a flat plate made of optical glass, on the surface of which, on the side of the upper inductive sensor, there are channels connected through a blocking block with a vacuum pump, while the surface of the cassette from the side the lower inductive sensor is made hollow.

Unlike the known analogues, the inventive comparator, additionally containing a removable cassette, in which a tight fit of fine measures to the cassette is ensured, due to the supply of vacuum through the channels made on its surface from the side of the upper transducer, allows verification of fine measures with a nominal value of less than 0.5 mm, in addition to its original functions - verification of plane-parallel end measures of length, with a nominal value of 0.5 mm.

The essence of the invention is illustrated by drawings (Fig. 1 and Fig. 2), which show a schematic diagram of a universal comparator and the design of a removable cassette.

The comparator (Fig. 1) contains a measuring table with a rigidly fixed granite base 1, on which a column 2 is vertically mounted, fixed on the reverse side of the granite base 1, upper 3 and lower 4 brackets, while the top 3 bracket is fixed on the column 2 with the possibility of movement along it above the granite base 1. The upper 3 and lower 4 brackets are equipped with a microfeed mechanism 5 and 6 with a flywheel, respectively, of the upper 7 and lower 8 sensor, for example M-026, also developed by the applicant, including a measuring module, a vacuum caging system, installed in a cylindrical housing , while the said top 7 and bottom 8 sensors are connected to the corresponding inputs of the display unit 9 connected to the output of the computer 10 and to the input of the caging block 11, and the vacuum caging system of the corresponding top 7 and bottom 8 transducer is connected through the caging block 11 and the receiver 12 to vacuum pump 13. The comparator also contains removable cassette 14 (Fig. 2) for locating the CMD, which is a flat plate made of optical glass, on the surface of which, on the side of the upper 7 sensor, there are channels 15 for supplying vacuum, connected through a caging block 11 and a receiver 12 with a vacuum pump 13, while the surface of the cassette from the side of the lower 8 of the transducer is made hollow. Blocks 9 and 11 were developed by the applicant for the inventive universal comparator.

The comparator works as follows.

The inventive comparator uses a differential method for measuring measures using the upper and lower inductive sensors with a measuring module and a vacuum caging system included in the respective sensors 7 and 8.

The special comparator software was developed by the applicant and installed in the computer.

The universal comparator software consists of two parts. The first part concerns the verification of the KMD, and the second part concerns the verification of the comparator itself.

The software allows:

- receive information about trusted and verified sets;

- check the selected set;

- receive information about sets in accordance with GOST 9038-90;

- enter information about reference sets;

- receive information about all sets of attorneys on a given comparator;

- check the comparator itself.

Work with the program is carried out according to the following algorithm.

1. Launching the program. The main menu with windows opens. The screen will display the readings of the upper 7 and lower 8 sensors, and their total readings.

2. Data entry of the reference set. To do this, the data of the reference sets used for verification are entered.

3. Verification of end measures. From the menu, select the item - "Checked sets". Next, the position is selected - "Create" and data is entered according to the standard or non-standard set, which will be verified. Then the menu item is selected - "Start a new verification". The set that will be verified from the list of sets is selected and the empty windows are filled: "Manufacturer", "Owner", "Class", "Discharge", "Verifier", "Temperature", "Humidity".

Then a reference set is selected from those proposed by the program. The position - "Verification" is selected from the main menu. The selected set appears on the screen.

Reference 17 and verified 16 KMD are placed in a removable cassette 14, which is installed on the measuring position. The required measure is selected from the list in the program.

Using the movement mechanisms included in the design of the column 2, the upper measuring sensor 7 is brought up to touch with the reference measure 17. After that, the upper bracket is securely fixed.

By rotating the movement mechanism 5 for fine tuning, the upper measuring module is adjusted to "0" with an accuracy of ±0.5 µm. After that, the lower measuring module is adjusted to “0” with an accuracy of ±0.5 µm by rotating the handwheel of the movement mechanism 6 for fine tuning the lower sensor 8. is not produced, as it does not participate in the measurements.

The settings window closes. The measurement is performed according to the points bypass scheme, according to the recommendation of MI 2079-90.

The results are saved.

4. Processing of measurement results.

Verification of the end measures of length includes the determination of the median length, the deviation of the length from the nominal, the deviation from the plane parallelism of the end measures. Measurements and readings are performed in the following sequence:

on the reference end measure at the middle point - counting 0 _beginning (initial zero);

on the end gauge being checked at the middle point - reading C1 and at four corner points of the measuring surface of the measure - readings a, b, d, e and again at the middle point - reading C2;

on the reference end measure at the middle point - a second count of 0 _con (end zero);

The discrepancies between readings 0 _initial and 0 _end , C1 and C2 when checking exemplary end blocks of the 3rd category and working accuracy class 1 should not exceed 0.05 microns, when checking standard end blocks of the 4th category and working accuracy classes 2 and 3 - 0.1 microns and working end blocks of accuracy classes 4 and 5 - 0.4 microns.

If the discrepancies exceed the indicated values, the measurements should be repeated.

All received readings are processed and recorded in the verification protocol, the form of which is given in the appendix.

Based on the received readings, the program calculates the deviation from plane parallelism, from the nominal length, from the median length and the median length of the gauge block.

From readings 0 _start , 0 _end and C1, C2 are calculated average values 0 _cf , and C _cf .

To determine the deviation from plane parallelism h, the difference between the largest and smallest readings from C _cf is calculated; a; b; d; e. The maximum absolute value of the difference is taken as a deviation from the plane-parallelism of the end measure.

To determine the deviation from the nominal length ΔLn, Δl _max is calculated - the maximum difference between one of the readings C _cp , a, b, d, e and reading 0 _cf and algebraically summed with ΔL _mod .

ΔLn=ΔL _arr +Δl _max

where ΔL _arr is the deviation of the median length of the reference end measure, microns.

To determine the deviation of the median length from the nominal value ΔL _pov and the median length L _pov of the verified measure, the difference in the median lengths of the verified and reference end measures Δl _c is calculated.

Δl _c \u003d C _cf - 0 _cf.

Then:

ΔL _rev = ΔL _arr + Δl _c , L _rev =L + ΔL _rev

where L _pov is the nominal length of the checked end measure, mm;

ΔL _pov - deviation of the median length of the verified measure, mm.

Based on the verification results, the program generates a verification protocol.

Claims (1)

A comparator for checking plane-parallel gage blocks, containing a measuring table with a rigidly fixed granite base, on which a column is vertically mounted, fixed on the reverse side of the granite base with a rod, bottom bracket and nut, the upper bracket is fixed on the column with the possibility of moving along it over the granite the base, while the upper and lower brackets are provided with a mechanism for supplying the corresponding sensor, including a measuring module and a vacuum caging system installed in a cylindrical housing, while the said upper and lower sensors are connected to the corresponding inputs of the display unit connected to the output of the computer and to the input of the caging unit , and the upper and lower vacuum caging system of the corresponding transducer is connected through a caging block and a receiver to a vacuum pump, characterized in that the comparator is additionally equipped with a removable cassette for basing measures, representing a flat plate made of optical glass, on the surface of which, on the side of the upper transducer, there are channels connected through a caging block and a receiver with a vacuum pump, while the surface of the cassette on the side of the lower transducer is made hollow.

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