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• universality of the installation for monitoring
various types of internal
and external threads;
• non-contact measurement method and full replacement of manual control
with calibers;
• 100% control of each pipe or coupling directly on the production or repair
line;
• control of all thread parameters according to GOST, high accuracy and
repeatability of results;
• possibility of measuring the wall thickness under the thread and the
internal chamfer;
• high reliability, absence of special requirements for maintenance
personnel;
• absence of special requirements for the basing
of pipes at the control
position;
• small size and weight;
• saving measurement results in the database and displaying them as
graphic and text protocols with the ability to print;
• connection of the plant with the production
control system for the
certification of pipes.
The principle of operation is based on conoscopic profilometry, i.e. non-
contact measurement of the thread geometry by laser scanning of a given num-
ber of sections (Fig. 6.9)
Figure 6.9 – Scheme of the mechatronic installation:
1 – linear motor; 2 – rotation drive of the pickup nozzle;
3 – laser micrometer; 4 – laser beam; 5 – controlled product.
The specialized software uses the obtained data for differentiated element-
by-element control of individual thread parameters. By results of measurements
automatically conforms of the thread to the requirements of GOST and its
suitability for subsequent application is determined. The installation can work
either autonomously or as part of ACS of production
with the output of the
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obtained measurement results and service signals in digital form. The main
controlled parameters are: pitch and thread length,
profile height, profile side
angle, vertex rounding radius and profile troughs, taper, diameters and thread
length, wall thickness under the thread.
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