SE128746C1

SE128746C1 -

Info

Publication number: SE128746C1
Authority: SE
Publication date: 1950-01-01

Description

KLASS 31 c:11 BEVILJAT DEN 27 APRIL 19 PATENTTID FRAN DEN 26 JAN. 1943 PUBLICERAT DEN 11 JUL! 19 Hartill en razzing. CLASS 31 c: 11 GRANTED ON 27 APRIL 19 PATENT PERIOD FROM 26 JAN. 1943 PUBLISHED ON JULY 11! 19 Hartill and razing.

C. C. MISFELDT, GLENDALE, CAL., AMERIKAS FORENTA STATER. C. C. MISFELDT, GLENDALE, CAL., UNITED STATES OF AMERICA.

Satt och form for framstallning av gjutgods. Set and form for the production of castings.

Prioritet begard frdn den 26 januari 1942 (Amerikas ferenta stater). Priority was given on January 26, 1942 (United States of America).

FOreliggande uppfinning hanfOr sig till pressgjutning och isynnerhet till ett salt och en anordning for pressgjutning av plastiska material och metaller, som resulterar i foremal, som ha manga av hejarsmidesgodsets egenskaper, speciellt med avseende pa likformighet och fullandning av den gjutna produkten. The present invention relates to die casting and in particular to a salt and apparatus for die casting of plastic materials and metals which result in molds which have many of the properties of the forging cast, especially with respect to uniformity and full landing of the cast product.

Huvudandama.let med foreliggande uppfinning är att astadkomma en anordning och ett salt for framstallning av material utan blasor, inneslutningar, avkylningsfelaktigheter eller krympsprickor. Uppfinningen avser i forsta hand ett satt att framstalla gjutgods genom att tvinga flytbart material in i en delad ihalig form, kannetecknat darav, att materialet bringas att flyta genom formen under bakom materialet tillfort positivt tryck utan atomisering av materialet for att bringa den fortskridande ytan av materialet att verka som en kolv for att tvinga luft ur formen, att den oxiderade och avkylda metallen i den fortskridande ytan uppfangas i en blindhalighet eller -haligheter f5rbundna med formens sjalva formhalighet, och att ett stelningstryck av avsevart Rad storlek tillfores materialet i formen, sedan namnda halighet eller haligheter fyllts. The main object of the present invention is to provide a device and a salt for the production of materials without blisters, inclusions, cooling defects or shrinkage cracks. The invention primarily relates to a method of producing castings by forcing flowable material into a divided hollow mold, characterized in that the material is caused to flow through the mold under positive pressure applied behind the material without atomizing the material to bring the advancing surface of the material to act as a piston to force air out of the mold, that the oxidized and cooled metal in the advancing surface is trapped in a blind cavity or cavities connected to the mold shape itself, and that a solidification pressure of considerable Rad size is supplied to the material in the mold, then said slipperiness or slickness filled.

Med avseende pa apparaten omfattar uppfinningen allmant en delad form, bestaende av mot varandra svarande formhalvor, vilka begransa en inloppskanal med formen av en provstang, som oppnar sig in i f ormhaligheten, och vilka aven inkludera blindhaligheter forbundna med formhaligheten for att upptaga metall, som passerar genom formhaligheten, varvid inloppskanalen star i f &bindelse med en tryckkammare forsedd med en tryckkolv, med Tars hjalp materialet t-vingas in i formen. With regard to the apparatus, the invention generally comprises a divided mold, consisting of corresponding mold halves, which define an inlet channel in the form of a test rod, which opens into the mold cavity, and which also include blind cavities connected to the mold cavity to receive metal which passes through the mold cavity, the inlet duct being connected to a pressure chamber provided with a pressure piston, with Tars helping the material to be forced into the mold.

Enligt foreliggande uppfinning framstallda forernal ha tillracklig hallfasthet for att vara godtagbara i stallet for sandgjutgods, ehuru de framstallts i en standardformgjutmasldn, eller i vissa fall, dã hogre tryck anvandas, istallet for hejarsmidesgods. Den har beskrivna anordningen och forfaringssattet ha i stor utstrackning minskat utskottsprocenten av delar exempelvis for anvandning i flygmaskiner, dar den minsta blasa i fOremalet fororsakar kassation. Sadan kontroll gores med hjalp av rdntgenstralar for varje del fore anvandningen, och i ett sarskilt fall minskades utskotten frau 2-3 % till 0,1 %, nar foreliggande uppfinning tillampades. ritningen visar fig, 1 en tvarsektion av en del av en maskin, vilken kan anyandas for att utfora fOrfaringssattet. Fig. 2 Or en perspektivvy av ett foremal, som framstallts enligt foreliggande uppfinning, och visar foremalet, nar det avlagsnats fran formen och fare fardigstallningen. Formulas produced in accordance with the present invention have sufficient rigidity to be acceptable in the form of sand castings, although they are produced in a standard mold casting mold, or in some cases, when higher pressures are used, instead of forged castings. The device and procedure described have greatly reduced the percentage of parts of parts, for example for use in aircraft, where the slightest blister in the form causes disposal. Such control is done by means of X-rays for each part before use, and in a particular case the projections were reduced from 2-3% to 0.1% when the present invention was applied. the drawing shows Fig. 1 a cross-section of a part of a machine, which can be used to perform the procedure. Fig. 2 is a perspective view of a mold made in accordance with the present invention, showing the mold when it has been removed from the mold and finished.

Ett pressblock 1 Or forsett med en tryckcylinder 2 omgiven av en upphettningscylinder 3, i vilken aro inbaddade elektriska upphettningselement 4 fOr upphettning av tryekcylindern. En tryckkolv 5 Or anordnad att foras genom tryckcylinderns halighet 6 av en hydraulisk pistong 7, vilken tryckkolv Or ihalig och forsedd med en rorlig insats 8, vars spets 9 anvandes for att tillsluta kolvens 5 On-de. Kolven 5 glider Oven genom ett matningsblock 11 fast medelst bultar 12 vid pressblocket 1, vilket matningsbloek 11 har ett laddningsinlopp 14, som oppnar sig uppat for att mottaga smalt metall. Den motstaende sidan av pressblocket 1 är forsedd Hied en forminpassningsplatta 15, som har en oppning 16, som sammanfaller med tryckcylinderns halighet 6, och denna forminpassningsplatta Or fast vid pressblocket 1 medelst bultar 17. T:tsprang 19 aro anordnade pa inpassningshlocket 15, som Or i ingrepp med ena halften 20 av en delad form 21, vars andra halft 22 Or i ingrepp med ett upphettningsblock 24, vilket upphettningsblock Or i kontakt med ett kolvhuvud 25, som glider i spar 26 pa maskinens huvudram 27, vid vilken pressblocket 1 Or fastat. Kolvhuvudet 25 drives av en hydraulisk kolystfing 28 for att tvinga formens bada halvor tillsammans under tryck under gjutningsprocessen. Inpassningsblocket 15 och upphettningsblocket 24 upphettas hada ge- 2— nom elektriska upphettningselement 29. Salunda upphettas presshatigheten 6 och bada halvorna av formblocket. A press block 1 Or provided with a pressure cylinder 2 surrounded by a heating cylinder 3, in which are electric heating elements 4 embedded for heating the pressure cylinder. A pressure piston 5 Or arranged to be passed through the hollow 6 of the pressure cylinder 6 by a hydraulic piston 7, which pressure piston Or is hollow and provided with a movable insert 8, the tip 9 of which is used to close the end of the piston 5. The piston 5 slides above through a feed block 11 fixed by means of bolts 12 to the press block 1, which feed block 11 has a charge inlet 14, which opens upwards to receive narrow metal. The opposite side of the press block 1 is provided with a form-fitting plate 15, which has an opening 16, which coincides with the hollowness 6 of the pressure cylinder, and this form-fitting plate Or is fixed to the press-block 1 by means of bolts 17. Taps 19 are arranged on the fitting block 15, which Or engaging one half 20 of a split mold 21, the other half 22 of which engages a heating block 24, the heating block Or in contact with a piston head 25 sliding in grooves 26 on the main frame 27 of the machine, to which the press block 1 Or is attached. . The piston head 25 is driven by a hydraulic colystic finger 28 to force both halves of the mold together under pressure during the casting process. The fitting block 15 and the heating block 24 are heated by means of electric heating elements 29. Thus, the press speed 6 is heated and both halves of the mold block are heated.

Den delade formen 21 dr forsedd med en inre halighet 30, som yid den ena anden har ett inlopp 31, som sammanfaller med oppningen 16 och tryckhaligheten 6. Huvudformhalighetens 80 form är naturligtvis formen pa det foremal som skall gjutas. Emellertid anordnas aven hjalphaligheter och fOretradesvis blindbaligheter i den delade formen, vilkas lagen lattast kunna ses pa det pa fig. 2 visade fardiggjutna foremalet. Pa. fig. 2 är foremalsdelen 30' formad efter konturen av huvudhaligheten 30. Salunda är formhalig- hetens inlopp 31 direkt forbundet med en provstangsdel 35 av haligheten, i vilken en provstang 35' gjutes mellan inloppet och fO- remalet, vilken provstang har fOrstorade par-tier 36 vid vardera anden och en smalare del 37 mellan de fOrstorade partierna. Langs kan- terna av huvudhaligheten aro anordnade sidohaligheter skilda fran huvudhaligheten endast genom ett smalt spelrum mellan plattorna, sa att nar formen är full, bildas sidoskenor av avsevard tjoeklek fasta vid föremãlet 30' genom tunna fenor 38'. MetaBen Iran aven tvingas genom de skenorna 38 bildande haligheterna for att bilda sidofenor 39, vilka naturligtvis aro papperstunna, dar metallen inkornmer mellan formplattorna 20 och 22. De haligheter, vilka bilda skenorna 38, Aro gjorda s, att de aro av avsevard volym och halla en avsevard mangd metall. The divided mold 21 there is provided with an inner cavity 30, which in one end has an inlet 31, which coincides with the opening 16 and the pressure cavity 6. The shape of the main mold cavity 80 is, of course, the shape of the mold to be cast. However, auxiliary cavities and preferably blind bales are also provided in the divided form, the layers of which can most easily be seen on the finished molded article shown in Fig. 2. Pa. Fig. 2, the mold portion 30 'is formed after the contour of the main cavity 30. Thus, the inlet 31 of the mold cavity is directly connected to a test rod portion 35 of the cavity, in which a sample rod 35' is cast between the inlet and the mold, which sample rod has enlarged portions. 36 at each end and a narrower portion 37 between the enlarged portions. Along the edges of the main cavity are arranged side cavities separated from the main cavity only by a narrow clearance between the plates, so that when the mold is full, side rails of considerable thickness are formed fixed to the object 30 'by thin fins 38'. MetaBen Iran is also forced through the ridges forming the rails 38 to form side fins 39, which are of course paper-thin, where the metal encloses between the mold plates 20 and 22. The ridges which form the rails 38 are made so that they are of considerable volume and inclination. a considerable amount of metal.

Vid formens Ovre dude utformas, eftersom det foredrages att anordna formen i vertikalt la.ge, en blindhalighet 40, som kommunicerar med huvudhaligheten 30 vid den bortre nden av det gjutna fOremalet, sa att nar metallen strommar in i denna halighet 40, bildas en metallande 40'. Den lialighet, som bildar denna ande ar av avsevard storlek, for att all den metall, som fOrst passerar genom huvudhaligheten 30, skall kunna upptagas och hallas dari. Det faredrages att inspruta den smalta eller plastiska metallen i formen langsamt, och den kontinuerliga hojningen av metallnivan i formen utdriver luften och fyller for-men utan atomisering. Den i formen forst instriimmande metallen, vilken naturligtvis är I beroring riled luften i formen, nar den tyingar luften ut ur formen mean de sammanfOrda ytorna av formplattorna, upptages antingen i sidoskenorna 38 och fenorna 39 eller anden 40'. Naturligtvis avkyles denna forsta metall, nar den passerar genom formen, nagot, fOrutom att den oxideras, och genom att den kalla metallen drives genom och forbi huvudhaligheten kan ingenting av denna avkylda och oxiderade metall kvarlamnas i huvudhaligheten for att bilda flagon del av det huvudforemal, som skall gjutas dari. In the upper dude of the mold, since it is preferred to arrange the mold vertically, a blind cavity 40 is formed which communicates with the main cavity 30 at the far end of the molded article, so that when the metal flows into this cavity 40, a metallizing 40 '. The surface which forms this spirit is of considerable size, so that all the metal which first passes through the main cavity 30 can be absorbed and held therein. It is dangerous to inject the narrow or plastic metal into the mold slowly, and the continuous rise of the metal level in the mold expels the air and fills the mold without atomization. The metal which first enters the mold, which is of course in contact with the air in the mold, when it forces the air out of the mold between the joined surfaces of the mold plates, is received either in the side rails 38 and the fins 39 or the spirit 40 '. Of course, this first metal, as it passes through the mold, cools somewhat, except that it is oxidized, and by driving the cold metal through and past the main cavity, nothing of this cooled and oxidized metal can be left in the main cavity to form a flake portion of the main mold. to be cast therein.

Pa. fig. 2 visas schematiskt pa den ovre ytan av anden 40' vissa stromningsmarken 41, som aro iakttagbara for -blotta Ogat vid undersokning av anden. Redan det fOrhallandet, att sadana marken visa sig pa ytan av metallen, visor, att metallen icke är homogen pa detta stalle. Markena hero pa oxiderad-metall Man- dad med den renare metallen. Under vanliga forhallanden och i vanliga formar skulle denna oxiderade metall bilda en del av det gjutna foremalet. Vid det f5religgande forfaringssattet avlagsnas emellertid sadan fororenad metall Iran det gjutna fOremalet, eftersom alla de haligheter, som upptagit den forsta metallen under gjutningen aro blinda, sa att metallen senare bortskares. Anvandningen av dessa hjalphatigheter hindrar icke pa Ira-got salt den sista tillforingen av tryck under metallens stelnande. ROntgenundersOkning av delar framstallda enligt det oven. beskrivna forfaringssattet kunna ofta visa gasinneslutningar, oxidation och ibland kylningsfelaktigheter i skenorna 38 och anden 40'. Ibland uppvisar anden 40' mycket bestamda felaktigheter pa grund av for tidig avkylning av den dari inflytande metallen. I alla handelser fylles huvudhaligheten 30 endast med ren, varm metall, och fullkomligheten av de gjutna foremalen iikas i stor utstrackning med avseende pa procenten utskott. Pa. Fig. 2 shows schematically on the upper surface of the duct 40 'certain flow marks 41, which are observable for the naked eye when examining the duck. The mere fact that such ground appears on the surface of the metal shows that the metal is not homogeneous in this place. Markena hero on oxidized metal Manded with the cleaner metal. Under ordinary conditions and in ordinary molds, this oxidized metal would form part of the cast foremale. In the present process, however, such contaminated metal is removed from the cast iron, since all the cavities which occupied the first metal during casting are blind, so that the metal is later cut off. The use of these auxiliary speeds does not prevent on Ira-got salt the last application of pressure during the solidification of the metal. X-ray examination of parts manufactured according to the above. described procedures can often show gas entrapment, oxidation and sometimes cooling defects in the rails 38 and spirit 40 '. Sometimes the spirit 40 'exhibits very definite inaccuracies due to premature cooling of the metal influencing it. In all transactions, the main cavity 30 is filled only with pure, hot metal, and the perfection of the cast forums is greatly increased with respect to the percentage of protrusions.

Sedan foremalet sasom visas pa fig. 2 avlagsnats ur.formen, kan provstangen 35' avlagsnas fran foremalet genom skarning Hugs den streckade linjen 42 vid fogen mellan fOremalet och provstangsdelen, skenorna 38 avskiljas fran foremalet, och anden 40' avlagsnas genom skarning Tangs linjen 43. Denna avlagsnade metall kan renas och anvandas pa nytt. Foremalet kan darefter rengoras for sin slutliga anvandning och hal borras i overensstammelse med markena 44, om sa onskas. Ingen polering erfodras, utom dar foremalet skurits eller trimmats. After the form as shown in Fig. 2 has been removed from the mold, the test rod 35 'can be removed from the form by cutting. This removed metal can be purified and reused. The article can then be cleaned for its final use and drilled in accordance with the marks 44, if desired. No polishing is required, except where the paint has been cut or trimmed.

Ehuru foreliggande uppfinning beskrivits tillampad pa en sarskild gjuten del och med ett sarskilt arrangement av blindhaligheter for att upptaga den forsta metallen, som passerar genom formen, ãr det for faekmannen uppenbart, att delar av vilken corn heist storlek och form kunna gjutas enligt foreliggande uppfirming, varvid pa alla stallen, dar det kan anses nodvandigt utefter formen anordnas blindkaviteter fOr upptagande av den forsta metallen, som strOmmar genom for-men. Naturligtvis varierar anordnandet av sadana blindhalligheter och deras forbindning med formens huvudhalighet avsevart overensstammelse med foremalets form. De har lamnade foreskrifterna torde vara tillrackliga for en fackman for att anbringa sadana blindhaligheter i de ratta lagena runt omkring huvudhaligheten i enlighet med flOdet av metall darigenom, sa att dessa blindhaligheter upptaga den forsta avkylda eller oxiderande metallen, som passerar genom formen. — —3 Although the present invention has been described as being applied to a particular molded part and having a particular arrangement of blind cavities for receiving the first metal passing through the mold, it will be apparent to those skilled in the art that parts of which the size and shape of the corn can be molded in accordance with the present invention in all stables, where it can be considered necessary along the mold, blind cavities are arranged for receiving the first metal, which flows through the mold. Of course, the arrangement of such blind cavities and their connection with the main cavity of the mold varies considerably with the shape of the object. The regulations provided are sufficient for a person skilled in the art to apply such blind cavities in the steering layers around the main cavity in accordance with the flow of metal therethrough, so that these blind cavities absorb the first cooled or oxidizing metal passing through the mold. - —3

Claims

Patent claim:

Set to produce castings by forcing flowable material into a divided hollow mold, characterized in that the material is caused to flow through the mold under positive pressure applied behind the material without atomizing the material to cause the advancing surface of the material to act as a soul. piston for forcing air out of the mold, that the oxidized and cooled metal in the advancing surface is trapped in a blind cavity or cavities connected to the mold shape itself, and that after solidification pressure of considerable Rad size is supplied to the material in the mold, then said cavity or cavities filled.

2. set according to patent claim 1, characterized in that the material is caused to flow upwards through the mold under the positively applied pressure.

Shtt according to patent package 1 or 2, characterized in that the material is introduced into the mold through an inlet channel in the form of a test rod.

A split mold for making the set according to claim 3, consisting of corresponding mold halves (20, 22), which define an inlet channel (35) in the form of a test rod, which opens into the mold cavity (30), and which also include blind cavities connected to the mold cavity to receive metal passing through the mold cavity (30), the inlet channel (35) communicating with a pressure chamber (6) provided with a pressure piston (5), by means of which the material is forced into the mold .

Split mold according to claim 4, characterized in that at least one of the blind cavities (40) is located at the opposite spirit of the split mold at the inlet (35) for receiving the first metal which passes through the mold cavity (30). Stockholm 1950, Kungl. Boktr, P. A. Norstedt & Sthier 500089