DE2011254C - Casting mold for the production of a one-piece cast piece - Google Patents

Description

25 training longer.

In an expedient embodiment, the invention provides for this purpose that the first, perpendicular Growth part shorter than the second, horizontal

The invention relates to a casting mold for the production of a growing part. Such Development of a single crystal casting and in particular 30 embodiment is used to produce a single upright on a cooling plate and apply from a crystal castings, which substantially län heating device enclosed, open at the bottom pourers than are wide, for example turbine blades, form for the production of a single crystal casting with the in the direction of its longitudinal axis through the on the centrifugal forces acting on a laterally and upwardly narrowed turbine rotor between one on the cooling plate.

standing, vertically running first wax Using the example of the configuration shown in the drawing

The invention will now be further elucidated in part and in a mold-guiding form which forms the casting.

cavity. tert. In the drawing is

From French patent specification 1 481 366, FIG. 1 is a section through a casting mold,

a mold of this type is known in which the 40 Fi g. 2 a section through a modified execution

The sense of the narrowed passage is, one of the cooling form,

plate on which the growth part rises., go out- F i g. 3 a vertical one on an enlarged scale

to prefer the growth of the crystal, cut through a casting with dendritic wax

that only this crystal does the actual turn and

Reached mold cavity and this with the formation of 45 Fig. 4 a horizontal cross section through a

desired single crystal fills. Casting with dendritic growth.

The cast in this known casting mold The casting mold is generally designated 10 and

crystal castings are oriented in one direction. includes a mold cavity 12, a sprue 14,

Such a single crystal has in this direction a consisting of the sections 16a, 166, 16c

Particularly high strength. 50 narrowed passage, the first growth part 20,

In modern jet engines, doors used the second growth part 18 as well as two cooling plate blades, which are preferably as single crystal castings 22 and 24, of which the cooling plate 22 are made vertically, are arranged by centrifugal forces and through and the second, horizontal thermal effects are highly stressed. This area limits the growth part 18, while the cooling load takes place not only in one but in several plate 24 in the first, perpendicularly extending wax directions. The limited 20 used in jet engines. The entire casting mold 10 is in th turbine blades, therefore, such blades must be enclosed in four containers 26. The space can withstand two-way loads. see the mold 10 and the container 26 is with This results in the problem of a casting and a refractory support material 28, z. B. Al ₂ O _{3 from in} particular a turbine blade to pour so that 60 filled. The casting mold 10 is a shell casting mold, the finished casting withstands loads in all of Rieh's usual construction from a number of stresses. The invention is therefore based on the different layers of a suitable shaping material, the known casting mold in this way. The casting mold 10 is poured in such a way that in it single crystal castings are heated to a high degree that a temperature gradient between the load capacity in all directions is pouring 65 cooling plate !! 22, 24 and the top of the pouring spouts. To solve this problem, the egg fin shape 10 is created. The heating is carried out in such a way, in the case of a casting mold of the type mentioned at the outset, that the casting mold temperature increases with increasing temperature, so that a second, horizontally extending rigidity is gradually reduced. The cooling off

2 Oil 254

^{through the}

through the rest in the sense of p
temperature is monitored in this way
horizontal fixed C
point of the two ί

Warming ^ SST u 32 34 Send Ä £ "? Den wÄmsS? ISΝ.Γ ι ⁶ ' ¹ '

bez'ujau "the E ^ rrtgszone
gert be kanvTf _c

^essential
Intersection

τ ? ^arises - ^T " ^au | ^tIoniS P ^ul en 30,

^de T ^{Ormteil 12 And thus have the} characteristic (001) orientation J " ^ΚΟΓΠεΓ 'which ^{lie against the} ^ cchL cooling plate ^M ' ^{and the} dendritic growth is still at right angles to the two cooling plates 5 22,24. In this way, has the blade after hardening will have the desired perpendicular (001) orientation, and the horizontal growth will ^{extend in two planes} , one at right angles to the

Le>

Alloy

ι ^L «ftT ^g

temperature of UrieiSSrt
by KühSEa 24
fiction which 1 "! JV

pte Tst ! 7 the action de IC fhi. »
dLrch en sUndene T ^

^In Fig. ^{2 an} embodiment is shown in which the casting mold is designed so that the (001) ^{alignment is} "g ^waa S ^erecl ". In this Airing, - '

? ^ ° ^{ΓΠ1 bC the casting mold} ' ^{that the} horizontal

^w »; ^d water 15 and vertical columnar growth parts 18, 20

^{And dle Le} " ^{with the} cooling plates 22 and 24 work together.

nu ^The β ™ «" «!« * «Difference from Fig. 1

^{By stands} ™> ^d ate the vertical growth part 20 ISN

^U " ^{d that there} '8 ^{it is as the} horizontal growth part 18. In other

^A " ^SaU " ^{20 of} the two versions

rSteristisdie mon C ¹ Jf ^rt u ° ^{d3ß die Cha} -

WaSSmteil 18 ^ J ^ ⁵¹¹ "" ⁵³ " ⁵ " ^^ J "each ^d em

de? both wLhstumsteSe ifS "3? L · ^ndem , ^eil l ^he other wrd we den dta" κ? η * r> third in the kür ^ nn τίι η ^the " ^{Korner or Den} "

St erreiS i ^? rt «" 1 ° ^ ^rcU » ^{UngSpunkt zu} -Seren Te ™, over the ⁸ ^ ¹ '^ ^Wacl T ^{m of the} prevent crossing point hm ver

From the

is the axes

pillar

their? SiS wS

plates 22 24 heat

lead off 'id! d Z

rerSÄ

advantageous

^vertical

Lhaft OrkntiS
dendritic awake M ^
DhE 16?

b Γ

5 h ⁸ ; ϊ ι ^erhar , ^end en alloy

? ί ⁰⁶¹ " ^k i! ^rZe " em snow

^ "'f ^{Γ daS}

P I " ⁸

Cooling plates 22, 24 is oriented The narrow Dnrrh let 16a 16ft 16r rtipnt rtn ,,. · ^ · ⁸ ^ ■ "to keep growing ΐη ^{FoSiTi einZ} 'g ^e " ^Knsta "

ϋεΓνέΞε KrE, n T to be selected.

a säu ^ enarlp? Ä i J ^S ° ^{eordnet to} l. that only ^{a5 Nadldem} is the casting mold filled with the molten alloy, starting at each cooling plate, the ^E ^ ärtung and sits at right angles to the ^ÜhI ^ P ^ ^{slats in a} ulenartigen mold to the point of intersection on. The grains of the shorter column

^{grow a} ' ^{s first through} the crossing point, but the dendritic growth is influenced by the columnar growth of the longer column in such a way that dendritic growth takes place out of the ^{crossing point} in planes which

perpendicular to the two cooling plates 22, 24.

S " ^{Influence of the ZWdten KÜhl} P ^Ia " ^{e causes a steep} temperature gradient, while the hardening from the

Progresses intersection of the column and causes ^a "hnelleres growth of the grains from the M _m ren column. When the narrowed passage 16 '

^{is reached 'eiri is only peo it} g ^grain 8 ^{ewähIt' and} di it ^ ^{grows into and through} the mold part 12 ', while ^the dendritic growth, "hlplatten, but with horizontal ^ ⁸ ™" section at right angles ^{Z "de" two K 1} ! ¹ "« «." Disgusts. The in Fig. 2 cast ^a turbine blade, in which the axis & load transverse to the aerodynamic part

or horizontal as shown in FIG. The casting takes place under vacuum.

^{the shorter column SElltrccht sci} "

the part 166 inΓ the upper side ΐΐ ϊ-ϊί only one grain from the vertical ^ Tdf DS a grain always grows in the form of a _s el, 'Ln Kr stalls and with the same arihtng £ i ¥ 16 «through it ^ L ^^ ^ = SSsSSa

^{Waag, Erech! Be} · ^{Since the bes! E} crystal growth 'Λ' T ^{'the la "guests Ausdehnu"} g ^d "part? £ ^IIun 8 ^{irt. because the} temperature ^{gradient can be monitored} . will be the shorter

secure the main load axis.

In addition 1 PJatt drawings

Claims (2)

1 2 growth part in the first, vertical patent claims: growth part opens out at the end of the second growth part remote from the narrowed passage 1. Is arranged on a cooling plate and a cooling plate that closes it off, a heating device enclosed, open at the bottom 5 and the first and the second growth part different casting mold for the production of a single crystal casting are long. Piece with a laterally and upwardly directed, vertical orientation, which is cast or guarded in this casting mold between a single crystal casting on the senes single crystal casting has a double grain cooling plate. This leads to a high growth part and a load resistance of the casting in two directions which are perpendicular to one another and form a mold cavity. The different characterizes that a second, horizontal length of the two growth parts can influence the grain extending growth part (18) in the first, growth. The crystal grains from the vertically extending growth part (20) of a shorter growth part are the first to open through the end of the second growth part that is narrowed from the narrowed passage (16 a, 16 b, 15 and in the form 16 c). grow into the cavity. However, the dendritic growing part (18) of a cooling plate closing it is arranged by the columnar growth (22) and the first and second of the crystal grains from the longer growth part growth part (20, 18) are of different lengths. influenced. In the Formhohlrauni therefore results 2. Casting mold according to claim 1, characterized in that there is a crystal wax taking place in two directions. indicates that the first one, runs vertically. The casting receives its greater strength in fende growth part (20) shorter than the second, direction or parallel to the shorter growth part, horizontally extending growth part (18) is. Accordingly, one becomes that or that vertical growth part shorter or