MD572Z - Technological pulse current source of the tools for dimensional electrochemical machining of turbine blades - Google Patents

Technological pulse current source of the tools for dimensional electrochemical machining of turbine blades Download PDF

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Publication number
MD572Z
MD572Z MDS20110174A MDS20110174A MD572Z MD 572 Z MD572 Z MD 572Z MD S20110174 A MDS20110174 A MD S20110174A MD S20110174 A MDS20110174 A MD S20110174A MD 572 Z MD572 Z MD 572Z
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Moldova
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power
outputs
transformer
secondary winding
inputs
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MDS20110174A
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Romanian (ro)
Russian (ru)
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Сергей ДЕРЕВЯНЧЕНКО
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Сп Завод Топаз Ао
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Abstract

The invention relates to technological pulse current sources of the tools for dimensional electrochemical machining of turbine blades.The technological pulse current source of the tools for dimensional electrochemical machining of turbine blades comprises two power units composed of n modules. Each module consists of a three-phase rectifier, the outputs of which are connected to the inputs of a controlled inverter, the outputs of which, in turn, are connected to the primary windings of two power pulsed low-profile transformers. The output of the secondary winding of the first transformer is connected to the input of the secondary winding of the second transformer, at the same time the input of the secondary winding of the first transformer and the output of the secondary winding of the second transformer are connected to the inputs of a power rectifier, the outputs of which form the outputs of the module for connection of the tool electrodes of the tool for dimensional electrochemical machining. Each module of the power units is equipped with temperature sensors, connected to the controlled inverter, transformers and power rectifier, connected to a monitor and control unit, to which are connected the controlled inputs of each controlled inverter of the modules of the power units. The modules of each power unit are interconnected to their outputs in parallel.

Description

Invenţia se referă la surse de curent tehnologic de impulsuri ale strungurilor pentru prelucrarea electrochimică dimensională a paletelor de turbine. The invention relates to pulsed technological current sources for lathes for dimensional electrochemical machining of turbine blades.

Este cunoscută o sursă de curent tehnologic a strungurilor de prelucrare electrochimică, executată în baza unui redresor comandat cu un sistem de comandă a tiristoarelor, care formează la ieşire un curent tehnologic de impulsuri [1]. A technological current source for electrochemical machining lathes is known, made on the basis of a rectifier controlled with a thyristor control system, which forms a technological pulse current at the output [1].

Dezavantajele acestei surse constau în posibilităţile limitate de formare a impulsurilor de curent de scurtă durată (mai puţin de 0,5…3 s) şi imposibilitatea de a regla amplitudinea lor fără modificarea duratei. The disadvantages of this source are the limited possibilities of forming short-duration current pulses (less than 0.5…3 s) and the impossibility of adjusting their amplitude without changing their duration.

Este cunoscută o sursă de curent tehnologic a strungurilor de prelucrare electrochimică, care conţine un redresor comandat şi un invertor dependent, fiecare dotat cu sistem de control, precum şi un reactor şi o cheie cu tiristor. Totodată, intrarea invertorului prin reactor este conectată la ieşirea redresorului, iar sarcina prin cheia cu tiristor este conectată la intrarea invertorului [2]. A technological current source for electrochemical machining lathes is known, which contains a controlled rectifier and a dependent inverter, each equipped with a control system, as well as a reactor and a thyristor switch. At the same time, the input of the inverter through the reactor is connected to the output of the rectifier, and the load through the thyristor switch is connected to the input of the inverter [2].

Dezavantajele acestei surse constau în gama îngustă de variaţie a puterii de ieşire şi executarea constructivă în formă de unitate de alimentare cu un singur modul, ceea ce reduce fiabilitatea, măreşte greutatea şi gabaritele, ca urmare a utilizării transformatorului de forţă masiv. The disadvantages of this source are the narrow range of output power variation and the constructive execution in the form of a single-module power supply unit, which reduces reliability, increases weight and dimensions, as a result of the use of a massive power transformer.

Problema pe care o rezolvă invenţia constă în extinderea posibilităţilor de control al reglării curentului de ieşire şi tensiunii sursei de curent tehnologic, extinderea gamei puterilor de ieşire a acesteia, majorarea fiabilităţii acesteia şi reducerea greutăţii şi gabaritelor, ceea ce oferă comoditatea transportării, montării şi reparării strungurilor pentru prelucrarea electrochimică dimensională a paletelor de turbine. The problem solved by the invention consists in expanding the control possibilities of regulating the output current and voltage of the technological current source, expanding the range of its output powers, increasing its reliability and reducing its weight and dimensions, which provides convenience in transporting, assembling and repairing lathes for dimensional electrochemical processing of turbine blades.

Sursa de curent tehnologic, conform invenţiei, înlătură dezavantajele menţionate mai sus prin aceea că conţine două blocuri de putere formate din n module. Fiecare modul constă dintr-un redresor trifazat, ieşirile căruia sunt conectate la intrările unui invertor comandat, ieşirile căruia, la rândul lor, sunt conectate la înfăşurările primare a două transformatoare de putere de impulsuri de profil jos. Ieşirea înfăşurării secundare a primului transformator este unită cu intrarea înfăşurării secundare a transformatorului al doilea, totodată intrarea înfăşurării secundare a primului transformator şi ieşirea înfăşurării secundare a transformatorului al doilea sunt conectate la intrările unui redresor de putere, ieşirile căruia formează ieşirile modulului pentru conectarea electrozilor-scule ai strungului pentru prelucrare electrochimică dimensională. Fiecare modul al blocurilor de putere este dotat cu senzori de temperatură, cuplaţi cu invertorul comandat, transformatoarele şi redresorul de putere, uniţi cu un bloc de comandă şi control, la care sunt conectate intrările comandate ale fiecărui invertor comandat al modulelor blocurilor de putere. Modulele fiecărui bloc de putere sunt unite între ele cu ieşirile lor în paralel. The technological current source, according to the invention, eliminates the above-mentioned disadvantages by containing two power blocks consisting of n modules. Each module consists of a three-phase rectifier, the outputs of which are connected to the inputs of a controlled inverter, the outputs of which, in turn, are connected to the primary windings of two low-profile pulse power transformers. The output of the secondary winding of the first transformer is connected to the input of the secondary winding of the second transformer, at the same time the input of the secondary winding of the first transformer and the output of the secondary winding of the second transformer are connected to the inputs of a power rectifier, the outputs of which form the outputs of the module for connecting the tool electrodes of the lathe for dimensional electrochemical processing. Each module of the power blocks is equipped with temperature sensors, coupled with the controlled inverter, transformers and power rectifier, connected to a command and control block, to which the controlled inputs of each controlled inverter of the power block modules are connected. The modules of each power block are connected to each other with their outputs in parallel.

Rezultatul tehnic al invenţiei constă în extinderea posibilităţilor de control al reglării tensiunii şi curentului de ieşire, extinderea gamei puterilor de ieşire a acesteia, datorită utilizării a două unităţi de alimentare pentru prelucrarea electrochimică simultană bilaterală a paletelor turbinelor, majorarea fiabilităţii acesteia, datorită principiului modular de construcţie utilizat şi reducerea greutăţii şi gabaritelor datorită utilizării transformatoarelor de forţă de impulsuri cu profil jos, ceea ce asigură comoditatea transportării, montării şi reparării strungurilor pentru prelucrarea electrochimică a paletelor de turbine. The technical result of the invention consists in expanding the control possibilities of output voltage and current regulation, expanding the range of its output powers, due to the use of two power supply units for simultaneous bilateral electrochemical processing of turbine blades, increasing its reliability, due to the modular construction principle used, and reducing weight and dimensions due to the use of low-profile pulse power transformers, which ensures the convenience of transportation, assembly and repair of lathes for electrochemical processing of turbine blades.

Invenţia se explică prin desenul din figură, în care este reprezentată schema sursei de curent tehnologic a strungului pentru prelucrarea electrochimică dimensională a paletelor de turbine. The invention is explained by the drawing in the figure, which represents the scheme of the technological current source of the lathe for the dimensional electrochemical processing of turbine blades.

Sursa de curent tehnologic a strungurilor pentru prelucrarea electrochimică dimensională a paletelor de turbine este executată în baza a două blocuri de putere comandate separat, formate din n module. Fiecare modul constă dintr-un redresor trifazat 1, a cărui ieşiri sunt conectate la două intrări ale unui invertor comandat 2, care constă dintr-o placă de control 3 a modulului, două ieşiri ale căreia sunt conectate la intrările a două plăci 4 ale unor drivere de putere ale IGBT-tranzistoarelor, ieşirile cărora sunt conectate la înfăşurările primare a două transformatoare de putere de impulsuri de profil jos 5 şi 6. Ieşirea înfăşurării secundare a primului transformator 5 este unită cu intrarea înfăşurării secundare a transformatorului al doilea 6. Intrarea înfăşurării secundare a primului transformator 5 şi ieşirea înfăşurării secundare a transformatorului al doilea 6 sunt conectate la intrările unui redresor de putere 7, executat în baza diodelor Schottky MBPR400100CTL, produse de către International Rectifier. Ieşirile redresorului de putere 7 formează ieşirile modulului pentru conectarea electrozilor-scule ai strungului pentru prelucrarea electrochimică a paletelor (în figură nu sunt prezentaţi). Modulele fiecărui bloc de putere sunt unite între ele cu ieşirile lor în paralel. The technological power source of the lathes for the dimensional electrochemical processing of turbine blades is made on the basis of two separately ordered power blocks, consisting of n modules. Each module consists of a three-phase rectifier 1, the outputs of which are connected to two inputs of a controlled inverter 2, which consists of a module control board 3, two outputs of which are connected to the inputs of two boards 4 of power drivers of IGBT transistors, the outputs of which are connected to the primary windings of two low-profile pulse power transformers 5 and 6. The output of the secondary winding of the first transformer 5 is connected to the input of the secondary winding of the second transformer 6. The input of the secondary winding of the first transformer 5 and the output of the secondary winding of the second transformer 6 are connected to the inputs of a power rectifier 7, made on the basis of Schottky diodes MBPR400100CTL, produced by International Rectifier. The outputs of the power rectifier 7 form the outputs of the module for connecting the tool electrodes of the lathe for electrochemical processing of the blades (not shown in the figure). The modules of each power block are connected to each other with their outputs in parallel.

Fiecare modul al blocurilor de putere este dotat cu senzori de temperatură 9, 10 şi 11, cuplaţi cu plăcile 4 driverelor de putere ale IGBT-tranzistoarelor invertorului comandat 2, transformatoarele 5, 6 şi redresorul de putere 7, şi uniţi cu un bloc de comandă şi control 8, la care sunt conectate intrările comandate ale fiecărei plăci de control 3 a invertorului comandat 2 al modulelor blocurilor de putere. Each module of the power blocks is equipped with temperature sensors 9, 10 and 11, coupled with the boards 4 of the power drivers of the IGBT-transistors of the controlled inverter 2, the transformers 5, 6 and the power rectifier 7, and connected to a command and control block 8, to which the controlled inputs of each control board 3 of the controlled inverter 2 of the power block modules are connected.

Sursa de curent tehnologic funcţionează în modul următor The technological power source operates in the following mode

Tensiunea reţelei trifazate de 380 V se aplică la redresorul trifazat 1 şi se transformă în tensiune constantă de 540 V. Această tensiune se aplică la invertorul comandat 2, care o transformă într-o secvenţă de impulsuri cu frecvenţa de 15…35 kHz, care variază la comanda blocului de comandă şi control 8 în funcţie de tensiunea şi curentul de ieşire dorite. Această secvenţă se aplică la transformatoarele 5, 6, apoi la redresorul de putere 7, care formează curentul tehnologic cu care se alimentează electrozii-scule ai strungului pentru prelucrarea electrochimică dimensională a paletelor de turbine (în figură nu sunt prezentaţi). The three-phase network voltage of 380 V is applied to the three-phase rectifier 1 and is transformed into a constant voltage of 540 V. This voltage is applied to the controlled inverter 2, which transforms it into a sequence of pulses with a frequency of 15…35 kHz, which varies at the command of the command and control block 8 depending on the desired output voltage and current. This sequence is applied to the transformers 5, 6, then to the power rectifier 7, which forms the technological current with which the electrodes-tools of the lathe are powered for the dimensional electrochemical processing of turbine blades (not shown in the figure).

Cu ajutorul senzorilor de temperatură 9, 10 şi 11 se efectuează monitorizarea constantă a încălzirii plăcilor 4 driverelor de putere ale IGBT-tranzistoarelor invertorului comandat 2, transformatoarelor 5, 6 şi redresorului de putere 7. Rezultatele măsurărilor temperaturii sunt transmise la blocul de comandă şi control 8 pentru analiza şi deconectarea modulului corespunzător al blocului de putere la depăşirea temperaturii admise. Using temperature sensors 9, 10 and 11, constant monitoring of the heating of the boards 4 of the power drivers of the IGBT-transistors of the controlled inverter 2, transformers 5, 6 and power rectifier 7 is carried out. The results of temperature measurements are transmitted to the command and control block 8 for analysis and disconnection of the corresponding module of the power block when the permissible temperature is exceeded.

Caracteristicile generale ale sursei de curent tehnologic propuse la utilizarea a două blocuri de putere cu cinci module conectate în paralel în fiecare bloc sunt după cum urmează: The general characteristics of the proposed technological current source using two power blocks with five modules connected in parallel in each block are as follows:

- tensiunea de ieşire - 10…40 V; - output voltage - 10…40 V;

- curentul de ieşire maxim în regim de impulsuri - 20 000 A; - maximum output current in pulse mode - 20,000 A;

- curentul de ieşire maxim în regim constant - 6 000 A; - maximum output current in constant mode - 6,000 A;

- puterea de ieşire de impulsuri - până la 800 kW. - pulse output power - up to 800 kW.

Aceste caracteristici sunt confirmate de protocoalele de testare ale încercărilor de uzină ale sursei de curent tehnologic. These characteristics are confirmed by the test protocols of the factory tests of the technological power source.

1. SU 545071 A1 1977.01.30 1. SU 545071 A1 1977.01.30

2. SU 890546 A1 1981.12.15 2. SU 890546 A1 1981.12.15

Claims (1)

Sursă de curent tehnologic a strungurilor pentru prelucrarea electrochimică dimensională a paletelor de turbine, care conţine două blocuri de putere formate din n module; fiecare modul constă dintr-un redresor trifazat, ieşirile căruia sunt conectate la intrările unui invertor comandat, ieşirile căruia, la rândul lor, sunt conectate la înfăşurările primare a două transformatoare de putere de impulsuri de profil jos; ieşirea înfăşurării secundare a primului transformator este unită cu intrarea înfăşurării secundare a transformatorului al doilea, totodată intrarea înfăşurării secundare a primului transformator şi ieşirea înfăşurării secundare a transformatorului al doilea sunt conectate la intrările unui redresor de putere, ieşirile căruia formează ieşirile modulului pentru conectarea electrozilor-scule ai strungului pentru prelucrare electrochimică dimensională; fiecare modul al blocurilor de putere este dotat cu senzori de temperatură, cuplaţi cu invertorul comandat, transformatoarele şi redresorul de putere, uniţi cu un bloc de comandă şi control, la care sunt conectate intrările comandate ale fiecărui invertor comandat al modulelor blocurilor de putere; modulele fiecărui bloc de putere sunt unite între ele cu ieşirile lor în paralel.Technological power source for lathes for dimensional electrochemical machining of turbine blades, containing two power blocks consisting of n modules; each module consists of a three-phase rectifier, the outputs of which are connected to the inputs of a controlled inverter, the outputs of which, in turn, are connected to the primary windings of two low-profile pulse power transformers; the output of the secondary winding of the first transformer is connected to the input of the secondary winding of the second transformer, at the same time the input of the secondary winding of the first transformer and the output of the secondary winding of the second transformer are connected to the inputs of a power rectifier, the outputs of which form the outputs of the module for connecting the tool electrodes of the lathe for dimensional electrochemical machining; each module of the power blocks is equipped with temperature sensors, coupled with the controlled inverter, transformers and power rectifier, connected to a command and control block, to which the controlled inputs of each controlled inverter of the power block modules are connected; the modules of each power block are connected to each other with their outputs in parallel.
MDS20110174A 2011-11-04 2011-11-04 Technological pulse current source of the tools for dimensional electrochemical machining of turbine blades MD572Z (en)

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU545071A1 (en) * 1975-11-20 1977-01-30 Предприятие П/Я М-5644 Current pulse generator
SU890546A1 (en) * 1979-06-06 1981-12-15 Предприятие П/Я М-5644 Dc electric pulse generator for electrochemical machine
MD1538G2 (en) * 1999-11-02 2001-03-31 Vitalii Balitchii Pulse oscillator
EA001606B1 (en) * 1998-01-12 2001-06-25 Конинклейке Филипс Электроникс Н.В. Electrochemical machinning a workpiece
MD1589G2 (en) * 1999-11-02 2001-07-31 Apolon Oriol Pulse oscillator for erosion machining
EA001749B1 (en) * 1998-04-06 2001-08-27 Конинклейке Филипс Электроникс Н.В. Method of and arrangement for electrochemical machining
EA005146B1 (en) * 2000-04-18 2004-12-30 Конинклейке Филипс Электроникс Н.В. Method of controlling an electrochemical machining process
MD3749G2 (en) * 2007-06-11 2009-06-30 Институт Прикладной Физики Академии Наук Молдовы Current source for electric working processes
MD207Z (en) * 2009-06-05 2010-12-31 Институт Прикладной Физики Академии Наук Молдовы Current stabilizer
  • 2011

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU545071A1 (en) * 1975-11-20 1977-01-30 Предприятие П/Я М-5644 Current pulse generator
SU890546A1 (en) * 1979-06-06 1981-12-15 Предприятие П/Я М-5644 Dc electric pulse generator for electrochemical machine
EA001606B1 (en) * 1998-01-12 2001-06-25 Конинклейке Филипс Электроникс Н.В. Electrochemical machinning a workpiece
EA001749B1 (en) * 1998-04-06 2001-08-27 Конинклейке Филипс Электроникс Н.В. Method of and arrangement for electrochemical machining
MD1538G2 (en) * 1999-11-02 2001-03-31 Vitalii Balitchii Pulse oscillator
MD1589G2 (en) * 1999-11-02 2001-07-31 Apolon Oriol Pulse oscillator for erosion machining
EA005146B1 (en) * 2000-04-18 2004-12-30 Конинклейке Филипс Электроникс Н.В. Method of controlling an electrochemical machining process
MD3749G2 (en) * 2007-06-11 2009-06-30 Институт Прикладной Физики Академии Наук Молдовы Current source for electric working processes
MD207Z (en) * 2009-06-05 2010-12-31 Институт Прикладной Физики Академии Наук Молдовы Current stabilizer

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