PL59577B1 - - Google Patents
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- Publication number
- PL59577B1 PL59577B1 PL112775A PL11277566A PL59577B1 PL 59577 B1 PL59577 B1 PL 59577B1 PL 112775 A PL112775 A PL 112775A PL 11277566 A PL11277566 A PL 11277566A PL 59577 B1 PL59577 B1 PL 59577B1
- Authority
- PL
- Poland
- Prior art keywords
- die
- bath
- electrode
- etching
- boiling point
- Prior art date
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- 238000000034 method Methods 0.000 claims description 14
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 5
- 238000005530 etching Methods 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 238000009835 boiling Methods 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 2
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical class [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 claims description 2
- 150000002823 nitrates Chemical class 0.000 claims description 2
- 150000002826 nitrites Chemical class 0.000 claims description 2
- 239000003054 catalyst Substances 0.000 claims 1
- 238000000576 coating method Methods 0.000 claims 1
- 239000003112 inhibitor Substances 0.000 claims 1
- 239000000126 substance Substances 0.000 claims 1
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000005266 casting Methods 0.000 description 3
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000005554 pickling Methods 0.000 description 2
- 239000011253 protective coating Substances 0.000 description 2
- 101150114468 TUB1 gene Proteins 0.000 description 1
- 230000002730 additional effect Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 229940117975 chromium trioxide Drugs 0.000 description 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N chromium trioxide Inorganic materials O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- GAMDZJFZMJECOS-UHFFFAOYSA-N chromium(6+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Cr+6] GAMDZJFZMJECOS-UHFFFAOYSA-N 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 229910052570 clay Inorganic materials 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 229910001234 light alloy Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 150000007522 mineralic acids Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 230000007096 poisonous effect Effects 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 238000005488 sandblasting Methods 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 235000012222 talc Nutrition 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Description
Pierwszenstwo: Opublikowano: 20.III.1970 59577 KI. 48 d2, 1/16 MKP C 23 g Al4b UKD 621.794.423 Twórca wynalazku: dr Jerzy Romanski Wlasciciel patentu: Instytut Odlewnictwa, Kraków (Polska) Sposób czyszczenia kokil metalowych i Przedmiotem wynalazku jest sposób czyszcze¬ nia kokil metalowych do odlewania stopów lek¬ kich pozwalajacy na usuwanie zuzytych powlok ochronnych takich jak: mieszaniny szkla wodne¬ go z glinka formierska, talkiem, tlenkiem cynku, trójtlenkiem chromu i tym podobnych.Dotychczasowe sposoby oczyszczania kokil me¬ talowych opieraja sie prawie wylacznie na meto¬ dach mechanicznych polegajacych na piaskowaniu, skrobaniu i tym podobnych operacjach. Stosowa¬ ne jest równiez niejednokrotnie dodatkowe tra¬ wienie kokil w agresywnych i trujacych kwasach nieorganicznych.Te sposoby postepowania sa pracochlonne i po¬ woduja czesto uszkodzenie gladzi kokili, prowa¬ dzac do powiekszenia wneki roboczej. W efekcie nastepuje pogorszenie wygladu zewnetrznego odle¬ wów oraz powstawanie strat materialowych w wy¬ niku zbednej nadwagi odlewów.Celem wynalazku jest sposób czyszczenia kokil pozbawiony wyzej wymienionych niedogodnosci.Istota wynalazku polega na krótkotrwalym che¬ micznym trawieniu kokil w 10—50«/0 roztworze wodorotlenku sodowego w temperaturze wrzenia lub bliskiej wrzenia w czasie 2—10 minut. Kapiel trawiaca zawiera dodatki nieorganiczne o dziala¬ niu inhibicyjnym lub katalitycznym, takie jak azo¬ tyny, azotany, chromiany, pyl cynkowy w ilosci 0—10«/0 wagowych.Zabezpieczaja one kokile przed korozja w czasie 10 15 20 25 30 trawienia oraz przyspieszaja i ulatwiaja sam pro¬ ces usuwania zuzytej powloki ochronnej z po¬ wierzchni kokili.Trawienie kokil sposobem wedlug wynalazku odbywa sie w specjalnych wannach 1 wykonanych z miekkiej blachy stalowej, przedstawionych na rysunku. Kapiel trawiaca ogrzewa sie do tempe¬ ratury wrzenia lub bliskiej wrzenia, elektrodowa za pomoca pradu przemiennego o napieciu 10—24V i natezeniu rzedu 100—1000A, który czerpany jest z transformatora 2 polaczonego z woltomierzem 3 i amperomierzem 4.Elektrody stanowia: a) dwie blachy stalowe 5,5' zanurzone w kapieli (fig. 1), b) lub wanna stalowa 1 i jedna blacha 5 albo 5' (fig. 2), c) wzglednie wanna stalowa 1 i czyszczona ko- kila 6 (fig. 3). .Trawiona kokile 6 po wyjeciu z wanny 1 pod¬ daje sie plukaniu oraz szczotkowaniu miekka szczotka w naczyniu z zimna woda wodociagowa.Celem dokladniejszego oczyszczania poddaje sie ja dodatkowemu plukaniu w goracym rozcienczo¬ nym roztworze kwasu neutralizujacego lub w ka¬ pieli pasywujacej.Zastosowanie bezposredniego elektrodowego ogrzewania kapieli jest korzystniejsze od posred¬ nich sposobów ogrzewania, na przyklad za po¬ moca oporowych grzalek elektrycznych, poniewaz 5957750577 wyeliminowana zostaje w ten sposób mozliwosc czestych awarii urzadzenia na skutek korozji ele¬ mentów grzewczych. Ponadto w przypadku, gdy jedna elektrode stanowi metalowa wanna 1, a dru¬ ga elektrode czyszczona kokila 6, zachodzi dodat¬ kowe dzialanie pradu przemiennego. PLPriority: Published: 20.III.1970 59577 KI. 48 d2, 1/16 MKP C 23 g Al4b UKD 621,794,423 Inventor: Dr. Jerzy Romanski Patent owner: Foundry Research Institute, Krakow (Poland) Method of cleaning metal chill i The subject of the invention is a method of cleaning metal chills for casting light alloys which allow for the removal of used protective coatings such as: mixtures of water glass with molding clay, talcum, zinc oxide, chromium trioxide and the like. Previous methods of cleaning metal molds are based almost exclusively on mechanical methods consisting in sandblasting, scraping and the like. Additional etching of the die in aggressive and poisonous inorganic acids is also often used. These procedures are labor-intensive and often damage the die coals, leading to an enlarged working cavity. As a result, the external appearance of the castings is deteriorated and material losses are created as a result of unnecessary excess weight of the castings. The object of the invention is a method of cleaning the die without the above-mentioned drawbacks. sodium hydroxide at or near the boiling point for 2-10 minutes. The pickling bath contains inorganic additives with an inhibitory or catalytic effect, such as nitrites, nitrates, chromates, zinc dust in the amount of 0-10% by weight. They protect the die from corrosion during etching and accelerate and the process of removing the used protective coating from the die surface is facilitated. The die etching of the die according to the invention takes place in special tubs 1 made of soft steel sheet, shown in the drawing. The pickling bath is heated to the boiling point or close to the boiling point, the electrode is made of an alternating current of 10-24V and 100-1000A, which is drawn from a transformer 2 connected with a voltmeter 3 and an ammeter 4. The electrodes are: a) two 5.5 'steel sheets immersed in the bath (Fig. 1), b) or a steel bath 1 and one 5 or 5' sheet (Fig. 2), c) or a steel bath 1 and a cleaned boiler 6 (Fig. 3) ). The etched mold 6 is rinsed and brushed in a vessel filled with cold tap water after being removed from the tub 1. Electrode heating of the bath is preferable to indirect heating methods, for example by means of electric resistance heaters, since the possibility of frequent breakdowns of the apparatus due to corrosion of the heating elements is thus eliminated. Moreover, in the case where one electrode is a metal bath 1, and the other electrode is the cleaned die 6, an additional effect of the alternating current takes place. PL
Claims (4)
Publications (1)
| Publication Number | Publication Date |
|---|---|
| PL59577B1 true PL59577B1 (en) | 1970-02-26 |
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