EP0721387B1 - Verfahren und giessvorrichtung zum herstellen von teilen mit einer schraubensymmetrischen aussenkontur - Google Patents
Verfahren und giessvorrichtung zum herstellen von teilen mit einer schraubensymmetrischen aussenkontur Download PDFInfo
- Publication number
- EP0721387B1 EP0721387B1 EP95926880A EP95926880A EP0721387B1 EP 0721387 B1 EP0721387 B1 EP 0721387B1 EP 95926880 A EP95926880 A EP 95926880A EP 95926880 A EP95926880 A EP 95926880A EP 0721387 B1 EP0721387 B1 EP 0721387B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- casting
- mould
- section
- outer contour
- produced
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000005266 casting Methods 0.000 title claims description 76
- 238000000034 method Methods 0.000 title claims description 38
- 229910001018 Cast iron Inorganic materials 0.000 claims description 34
- 238000004519 manufacturing process Methods 0.000 claims description 21
- 238000003754 machining Methods 0.000 claims description 14
- 238000000465 moulding Methods 0.000 claims description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 229910002804 graphite Inorganic materials 0.000 claims description 6
- 239000010439 graphite Substances 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 230000005496 eutectics Effects 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 238000010112 shell-mould casting Methods 0.000 claims 4
- 238000000926 separation method Methods 0.000 claims 1
- 238000000227 grinding Methods 0.000 description 8
- 238000012545 processing Methods 0.000 description 8
- 238000003801 milling Methods 0.000 description 5
- 239000011148 porous material Substances 0.000 description 5
- 238000007711 solidification Methods 0.000 description 5
- 230000008023 solidification Effects 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 210000001520 comb Anatomy 0.000 description 3
- 238000010791 quenching Methods 0.000 description 3
- 230000000171 quenching effect Effects 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005087 graphitization Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000012778 molding material Substances 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910001141 Ductile iron Inorganic materials 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 229910052845 zircon Inorganic materials 0.000 description 1
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D25/00—Special casting characterised by the nature of the product
- B22D25/02—Special casting characterised by the nature of the product by its peculiarity of shape; of works of art
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
Definitions
- the invention relates to a method for producing Rotors for screw compressors which have a section one screw-symmetrical to an axis of symmetry Have an outer contour.
- GB 2 229 121 is the manufacture of a Screw element known for extruders.
- a Casting body by molding a model with screw-symmetrical outer contour and then this mold body used as part of a mold.
- the invention has for its object a method to improve the generic type such that such parts with less effort and therefore cheaper can be produced.
- This task is carried out in a process described in the introduction Art solved according to the invention in that Impression of the section with screw symmetrical Model having an outer contour in this section Molded body surrounding azimuthally to the axis of symmetry is produced and that with this mold body in a casting mold to solidify the shell Cast iron melt leading deterrent to the one to be manufactured Part of the corresponding cast iron cast is produced and that the mold under Sealing feed of the cast iron melt is poured out .
- the advantage of the method according to the invention is there too see that by the azimuthal surrounding area Mold body and pouring the same under Shell solidification of the cast iron melt leading to quenching already a screw-symmetrical outer contour having, in particular one-piece cast can be produced is.
- This is a significant reduction of the manufacturing effort achieved because of the geometry the screw-symmetrical outer contour is close to the final contour or true to the final contour.
- It also brings pouring under leading to shell solidification Quenching the cast iron melt has the advantages of doing so the one-piece cast body in particular defined high strength properties can be achieved and the Castings in particular have a high quality of themselves large cross-sectional differences extending material have and preferably preferably substantially homogeneous and in particular essentially free of pores and Cavities are.
- Another advantage is that the mold poured out under the sealing feed of the cast iron melt is, so that especially with precipitated graphite the graphitization pressure is used to blow holes and to prevent pores in the cast.
- the mold halves have a mold for at least one the section with the screw symmetrical Outer contour adjoining section of the part to be manufactured Form part.
- the mold body by molding the model with molding material and then unscrewing the model from the mold body will be produced. It is also useful if the Molded body by molding in an outer mold container is produced with a defined outer contour, in particular when the mold body as an insert in a Half of the mold should be inserted, in which case the Half of the mold corresponding to the outer contour of the casting body Has recess.
- Suitable for such a production of the mold body there is in particular a sand-molding process in which a molding of the model for the production of the Inner contour and, for example, the molded container Production of the outer contour of the mold body is carried out.
- the cast after demolding Centering surfaces created by machining the casting is then taken up on the centering surfaces and machined.
- Finishing is done, for example, by milling in one clamping and subsequent grinding in one further tension.
- the casting is carried out after Manufacturing of the centering surfaces in one clamping is finished.
- This is finishing grinding, preferably high speed grinding.
- cast iron melts all possible variants of cast iron melts would be usable, for example also a cast iron melt, which is created in cast iron with lamellar graphite.
- the structure is preferred predominantly pearlitic and slightly ferritic.
- the invention further relates to a casting device for manufacturing of rotors for screw compressors made of cast iron an outer contour that is screw-symmetrical to the axis of symmetry having section, this casting device especially for performing the above Variants of the inventive method is used.
- the object of the invention is in such a casting device solved in that a mold a Section with the screw-symmetrical outer contour azimuthal to the axis of symmetry surrounding and closed a model with the screw-symmetrical outer contour has molded mold body and that the mold of one when pouring to solidify one into the mold introduced cast iron melt surrounding heat sink is.
- the heat sink is made of steel gravel, which one has high heat capacity to have a deterrent effect to achieve the solidification of the shell in the cast.
- the weight of the Heat sink at least 8 to 10 times the casting weight is.
- the wall thickness of the casting mold is a maximum of 10 mm is, it is preferably provided that the wall thickness is a maximum of 5 to 10 mm.
- the casting mold could be made solely by the casting mold body be educated. However, it is particularly advantageous in particular, around which the screw-symmetrical outer contour section having to form additional sections, if the mold comprises two mold halves, into which the mold body is inserted.
- the mold halves are preferably designed such that they have a shape for at least one sticking to the section the section adjoining the helical outer contour form the part to be manufactured.
- a particularly precise casting can be achieved if the mold halves according to the mold mask or the mask molding process are produced, since it can be used to produce very precise shapes are.
- the invention further relates to a rotor for screw compressors with a screw-symmetrical outer contour having compression section, wherein according to the invention the rotor has a cross-section that is free of pores and voids from cast iron with graphite precipitates and that Structure in the cross-section is rigidified on the outer contour side.
- the invention relates to a part made of cast iron with a screw-symmetrical to an axis of symmetry Outer contour, in particular a rotor for one Screw compressor with a screw symmetrical Compression section having an outer contour, which according to the invention is characterized in that this one over a cross section of the section with screw symmetrical Outer contour has a homogeneous structure.
- the structure in the Cross section is completely free of pores and voids, whereby pores and cavities are to be understood as cavities, which are visible and larger than about 1/10 mm in diameter are.
- a particularly preferred embodiment of a part of the invention has in addition to the screw symmetrical Outer contour of other shaped elements, for example Wave approaches that also with the screw-symmetrical outer contour cast in one go are, so that the structure, for example by the seal supply available structure, through the entire extends in one piece and thus also the properties associated with this structure with the simple inexpensive manufacture refer to this whole one-piece body.
- the parts produced according to the invention are, for example Rotors 10, 12 shown in FIGS. 1 and 2 Screw compressors 14, each of the rotors 10 and 12 as a one-piece part with a section 16 or 18 screw-symmetrical outer contour, simplified below referred to as a screw-symmetrical section, formed is in which an outer contour of the rotors 10, 12 several helical to an axis of symmetry or screw axis 20 or 22 extending screw combs 24 or 26, which have different cross-sectional shapes, the Cross-sectional shapes are designed so that the Screw combs 24 and 26 of the two rotors 10 and 12 interlock tightly.
- the cross-sectional shape of the Screw combs 24 and 26 are different, however mutually adjusted so that with each other rotating rotors 10 and 12 of these compresses a medium becomes.
- the rotors 10 and 12 are in one piece with 30 designated housing arranged, which is the screw symmetrical Sections 16 and 18 are essentially sealing encloses.
- Each of the rotors 10 and 12 is also still on both sides of the symmetrical sections 16 and 18 and coaxial to the symmetry axis 20 or 22 integrally molded shaft ends 32 or 34 and 36 or 38 provided with which the Rotors 10 and 12 are rotatably supported in the housing 30.
- One of the shaft ends or the shaft end 36 is there led to a drive motor, not shown in Fig. 1 and driven by it.
- the casting mold 44 in turn comprises two mold mask halves 46 and 48, which according to the known shape mask method, for example described in the book "Foundry Molding Materials", VEB-Verlagtechnik Berlin, edition 1955, author: Dr. R. Grochalski are made. These mold mask halves 46 and 48 form a shape for the shaft ends 32 'and 36 ', which is on both sides of the screw symmetrical Section 16 'extend.
- the mold for casting the screw symmetrical section 16 ' is formed by a mold body 50, which the screw-symmetrical section 16 'in the azimuthal direction encloses closed to the axis of symmetry 20 and in a corresponding recess 52 of the two mold mask halves 46 and 48 is inserted.
- the casting mold body 50 is cylindrical to the axis of symmetry 20
- Outer surface 54 and end faces 56 and 58 and the recess 52 has an inner cylinder surface 60 and ring surfaces 62 and 64 delimiting them and forms with these a precisely fitting receptacle for the mold body 50.
- a division plane 70 of the two mold mask halves 46 and 48 is placed so that in this the axis of symmetry 20 of the rotationally symmetrical section 16, which is simultaneously the axis of symmetry for the two shaft ends 32 'and 36' forms.
- the casting mold comprises the two mold mask halves 46 and 48 and the mold body 50 inserted into it. This is arranged in the bucket 42 so that the axis of symmetry 20 runs in the vertical direction. Furthermore, the mold still surrounded by a heat sink 72 in the bucket 42, which from a bed surrounding the mold 44 Steel gravel is formed. The bed of steel gravel surrounds the entire mold 44 and has a mass, which is about 8 to 10 times the mass of the cast 10 'of the rotor corresponds.
- the mold 44 is designed so that it is preferably one between the casting 10 'and the heat sink 72 lying wall thickness of 5 to 8 mm, so that a suitable thermal coupling between the in the mold filled cast iron melt and the heat sink 72 is possible.
- the casting mold body 50 is produced as shown in FIG. 4, by means of a whole designated 80 Molding device having a molding container 82 in which a model 84 for the screw symmetrical Section 16 'can be used.
- the molded container 82 includes a bottom 86 and can be closed by a cover 88, an inner wall 90 of the molding container 82 the cylindrical Outer surface 54, the bottom 86, the end face 58 and the cover 88 define the end face 56.
- Of the Cover 88 is designed so that it is a one
- the outer contour of the model 84 has the corresponding opening 92, so that the model 84 with its screw symmetrical The outer contour extends through this opening and thus can also be screwed through the cover 88 is.
- the model 84 is also non-rotatably connected to a shaft 94, which is displaceable in the direction of its axis of rotation 96 a drive wheel 98 penetrates, but rotatably with the Drive wheel 98 is connected so that by rotating the drive wheel 98 the entire model 84 through the cover 88 can be unscrewed.
- Model 84 is preferably guided exactly the opening 92 formed in accordance with the outer contour Cover, which in the direction of the axis of symmetry 20, which runs coaxial to axis 96, has a length that at least approximately the extent of the model 84 in the Mold container 82 corresponds.
- the model 84 is used to manufacture the mold body 50 screwed far into the mold container 82 until it with his End face 100 is seated on the bottom 86 of the molded container 82. Subsequently, openings 102 are made using a Core shooter sand under pressure in the space between the model 84 and the molded container 82 with the bottom 86 and the cover 88 shot and in conventional Solidified so that the solidified sand the mold body 50 forms. After solidification is done by turning of the drive wheel 98, the model 84 from the mold body 50 unscrewed, then the cover 88 is lifted off and the mold body 50 is removed from the mold container 82.
- This mold body 50 is then in the two after one conventional mold mask halves produced 46 and 48 can be used to mold 44 form.
- the mold mask halves 46 and 48 are one for the mold mask process usual sand-resin mixture and hardened.
- Cooling of the screw-symmetrical section 16 'is required is the mold body 50 made of a mixture of quartz sand, To produce chrome ore and zircon sand.
- the mold 44 embedded in the heat sink 72 is at vertical alignment of the axis of symmetry 20 over a Feeder 104 with an essentially eutectic cast iron melt poured out, the cast iron melt in the
- Casting mold 44 essentially eutectic and due to the Quenching by the heat sink by solidifying the shell stiffens. Furthermore, the supply takes place in the way of Seal feed analogous to that known from gravity die casting Seal feeding (e.g. in the technical essay by Dipl. Ing. K. Näser with the title HD special casting in "The Constructor” 3/83 described), so that by forming in the mold 44 Graphitization pressure the formation of cavities is prevented.
- a cast iron melt is preferably used such melt used that the casting 10 'a structure from spheroidal graphite cast iron, so that preferably a GGG material, in particular GGG70, is created.
- the structure is advantageously essentially pearlitic and slightly ferritic, preferably approximately 95% pearlitic and approximately 5% ferritic.
- the mechanical one is carried out machining, for example only by Milling or only by grinding in the area of the screw symmetrical Section 16 ', so that after removal of the Oversize of the screw-symmetrical section 16 of the rotor 10 arises and further appropriate processing takes place of the stub shafts 32 'and 36' to the stub shafts Get 32 and 36.
- the casting 10 ' is preferably clamped after removal from the mold and in this clamping centering surfaces are machined, which are either recordings for tips or at least one Holder for clamping the workpiece or non-rotatable Hold and another such recording or recording embrace for a bit.
- the Cast 10 'in the screw-symmetrical section 16' preferably in the end regions 16a 'and 16b' with one each Clamping jaw set 110a and 110b clamped, such a Tensioning the screw symmetrical section 16 'therefore is simply possible because it uses the form mask process is manufactured and therefore already based on this Casting process high accuracy in the area of the peripheral surface, in which a clamping with the jaw sets 110a and 110b.
- the machining follows the cylinder surface 116 an end threaded portion 118.
- An end face 120 of the stub shaft end 32 ' is edited at least in such a way that a conical Centering hole 122 is introduced coaxially to the axis 20.
- the shaft stub projection 36 ' is also processed in such a way First, machining a cylinder surface 124, which adjoins the end face 112b, then the Machining a set back from the cylinder surface 124 Cylinder surface 126, which is preferably a Forms the frustum of the shaft and then the processing an end driving surface 128, which also is set back radially with respect to the cylinder surface 126, he follows. Then another is processed Front 130 of the shaft end 36 'in that also a conical centering hole 132 coaxial with the axis 20 is introduced.
- All machining operations are preferably carried out in the first clamping on the end faces 112a and 112b and the cylinder surfaces 114, 116, 124, 126 and 128 in the form of a pre-turning of these areas.
- the casting 10 ' After machining the centering surfaces, the casting 10 ' recorded with these and either with milling and finished a subsequent grinding operation or in one machine in one setup, especially finished by high-speed grinding.
- the casting 10 ′ in the centering bores 122 and 132 added between tips 134 and 136 and additionally in the area of the clamping surface 128 by means of jaws 138 Torque initiation excited.
- the clamping surface 128 remains on the finished part preserved and does not interfere with the use of the same.
- the advantage of the invention is that a high accuracy of the finished machined workpiece is accessible, for example selecting suitable finished No need for pairs of rotors, since all the rotors are sufficient high precision can be produced with little machining are.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Description
- Fig. 1
- einen Längsschnitt durch einen Schraubenverdichter, bei welchem als Rotoren Teile mit schraubensymmetrischer Außenkontur Verwendung finden;
- Fig. 2
- einen Schnitt längs Linie II-II in Fig. 1 und insbesondere durch die Rotoren mit schraubensymmetrischer Außenkontur;
- Fig. 3
- einen senkrechten Schnitt durch eine Vorrichtung zum Herstellen eines Abgusses für einen derartigen Rotor;
- Fig. 4
- einen Längsschnitt durch eine Vorrichtung zur Herstellung eines Gießformkörpers für eine Gießform gemäß Fig. 3;
- Fig. 5
- eine Darstellung einer ersten Aufspannung eines erfindungsgemäßen Abgusses für einen Rotor zur mechanischen spanabhebenden Bearbeitung; und
- Fig. 6
- eine Darstellung einer zweiten Aufspannung des Abgusses zur Fertigbearbeitung.
Claims (22)
- Verfahren zum Herstellen von Rotoren für Schraubenverdichter, welche einen Abschnitt, mit einer zu einer Symmetrieachse schraubensymmetrischen Außenkontur aufweisen,
dadurch gekennzeichnet,daS durch Abformen eines den Abschnitt mit schraubensymmetrischer Außenkontur aufweisenden Modells ein diesen Abschnitt azimutal zur Symmetrieachse geschlossen umgebender Gießformkörper hergestellt wird, und daß mit diesem Gießformkörper in einer Gießform unter zur Schalenerstarrung der Gußeisenschmelze führender Abschreckung ein dem herzustellenden Teil entsprechender Abguß aus Gußeisen hergestellt wird und daS dabei die Gießform unter Dichtspeisung der Gußeisenschmelze ausgegossen wird. - Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Gießen bei vertikal stehender Symmetrieachse des Gießformkörpers erfolgt.
- Verfahren nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, daß das Gußeisen in der Gießform im wesentlichen eutektisch erstarrt.
- Verfahren nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, daß die Gießform mit einer Gußeisenschmelze nahe dem Eutektikum gespeist wird.
- Verfahren nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, daß zur Herstellung der Gießform der Gießformkörper als Einsatz zwischen zwei Formhälften eingelegt wird.
- Verfahren nach Anspruch 5, dadurch gekennzeichnet, daß die Formhälften im Formmaskenverfahren oder Maskenformverfahren hergestellt werden.
- Verfahren nach Anspruch 5 oder 6, dadurch gekennzeichnet, daß die Formhälften eine Form für mindestens einen sich an den Abschnitt anschließenden Abschnitt des herzustellenden Teils bilden.
- Verfahren nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, daß der Gießformkörper durch Abformen des Modells mit Formmaterial und anschließendes Herausschrauben des Modells aus dem Gießformkörper hergestellt wird.
- Verfahren nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, daß der Gießformkörper durch Abformen in einem äußeren Formbehälter mit definierter Außenkontur hergestellt wird.
- Verfahren nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, daß der Abschnitt mit der schraubensymmetrischen Außenkontur als Abguß mit Aufmaß hergestellt und anschließend spanabhebend auf die endgültige Form bearbeitet wird.
- Verfahren nach Anspruch 10, dadurch gekennzeichnet, daß der Abguß mit Zentrierflächen versehen und dann spanabhebend fertig bearbeitet wird.
- Verfahren nach Anspruch 11, dadurch gekennzeichnet, daß der Abguß zum Versehen mit den Zentrierflächen im Bereich der schraubensymmetrischen Außenkontur aufgenommen wird.
- Verfahren nach Anspruch 11 oder 12, dadurch gekennzeichnet, daß die Fertigbearbeitung mit einer einzigen Aufspannung an den Zentrierflächen durchgeführt wird.
- Verfahren nach einem der Ansprüche 10 bis 13, dadurch gekennzeichnet, daß die spanabhebende Bearbeitung auf die endgültige Form auf einer Maschine durchgeführt wird.
- Gießvorrichtung zum Herstellen von Rotoren für Schraubenverdichter aus Gußeisen mit einem eine zu einer Symmetrieachse schraubensymmetrische Außenkontur aufweisenden Abschnitt, insbesondere zur Durchführung des Verfahrens nach einem der voranstehenden Ansprüche, wobei eine Gießform (44) einen den Abschnitt (16) mit der schraubensymmetrischen Außenkontur azimutal zur Symmetrieachse (20) geschlossen umgebenden und durch ein Modell (84) mit der schraubensymmetrischen Außenkontur geformten Gießformkörper (50) aufweist, und wobei die Gießform (44) von einem beim Abgießen zur Schalenerstarrung einer in die Gießform (44) eingebrachten Gußeisenschmelze führenden Kühlkörper (72) umgeben ist.
- Gießvorrichtung nach Anspruch 15, dadurch gekennzeichnet, daß der Kühlkörper (72) aus Stahlkies ist.
- Gießvorrichtung nach Anspruch 16, dadurch gekennzeichnet, daß das Gewicht des Kühlkörpers (72) das acht- bis zehnfache Gießgewicht beträgt.
- Gießvorrichtung nach einem der Ansprüche 15 bis 17, dadurch gekennzeichnet, daß die Wanddicke der Gießform (44) maximal 10 mm beträgt.
- Gießvorrichtung nach einem der Ansprüche 15 bis 18, dadurch gekennzeichnet, daß die Gießform (44) zwei Formhälften (46, 48) umfaßt, in welche der Gießformkörper (50) eingelegt ist.
- Gießvorrichtung nach Anspruch 19, dadurch gekennzeichnet, daß die Formhälften (46, 48) eine Form für mindestens einen sich an den Abschnitt (16) mit der schraubensymmetrischen Außenkontur anschließenden Abschnitt (32', 36') des herzustellenden Teils bilden.
- Gießvorrichtung nach Anspruch 19 oder 20, dadurch gekennzeichnet, daß die Formhälften (46, 48) nach dem Formmaskenverfahren oder Maskenformverfahren hergestellt sind.
- Rotor für Schraubenverdichter mit einem eine schraubensymmetrische Außenkontur aufweisenden Verdichtungsabschnitt, dadurch gekennzeichnet, daß der Rotor (10, 12) ein Abguß aus Gußeisen ist, daß der Rotor (10, 12) ein im Querschnitt ein poren- und lunkerfreies Gefüge mit Graphitausscheidungen aufweist, und daß das Gefüge im Querschnitt außenkonturseitig schalenerstarrt ist.
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4426567 | 1994-07-27 | ||
DE4426567 | 1994-07-27 | ||
DE4430890 | 1994-08-31 | ||
DE4430890A DE4430890A1 (de) | 1994-07-27 | 1994-08-31 | Verfahren und Gießvorrichtung zum Herstellen von Teilen mit einer schraubensymmetrischen Außenkontur |
PCT/EP1995/002762 WO1996003237A1 (de) | 1994-07-27 | 1995-07-14 | Verfahren und giessvorrichtung zum herstellen von teilen mit einer schraubensymmetrischen aussenkontur |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0721387A1 EP0721387A1 (de) | 1996-07-17 |
EP0721387B1 true EP0721387B1 (de) | 1999-12-08 |
Family
ID=25938726
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95926880A Expired - Lifetime EP0721387B1 (de) | 1994-07-27 | 1995-07-14 | Verfahren und giessvorrichtung zum herstellen von teilen mit einer schraubensymmetrischen aussenkontur |
Country Status (5)
Country | Link |
---|---|
US (1) | US5743321A (de) |
EP (1) | EP0721387B1 (de) |
CN (1) | CN1046442C (de) |
DK (1) | DK0721387T3 (de) |
WO (1) | WO1996003237A1 (de) |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1063687C (zh) * | 1997-10-16 | 2001-03-28 | 杨光兴 | 不锈钢螺旋桨整体铸造工艺 |
US6681835B2 (en) | 2001-04-27 | 2004-01-27 | Ishikawajima-Harima Heavy Industries Co., Ltd. | Method and apparatus for manufacturing supercharger rotor |
US6860315B2 (en) * | 2001-07-26 | 2005-03-01 | Copeland Corporation | Green sand casting method and apparatus |
JP2003184769A (ja) * | 2001-12-12 | 2003-07-03 | Hitachi Ltd | スクリュー圧縮機及びスクリュー圧縮機用ロータの製作方法 |
CA2438445C (en) * | 2002-12-26 | 2006-11-28 | Hyosung Corporation | Lyocell multi-filament for tire cord and method of producing the same |
US20080170958A1 (en) * | 2007-01-11 | 2008-07-17 | Gm Global Technology Operations, Inc. | Rotor assembly and method of forming |
DE102008035525B3 (de) * | 2008-07-30 | 2009-12-17 | Kapp Gmbh | Verfahren zum Herstellen eines Werkstücks und Schleifmaschine |
MX2012011513A (es) | 2011-10-03 | 2013-09-03 | Emerson Climate Technologies | Metodo para colar componentes de compresor de voluta. |
CN104015008A (zh) * | 2014-04-11 | 2014-09-03 | 汉钟精机股份有限公司 | 一种复合式螺旋转子的制造方法 |
CN104096806B (zh) * | 2014-07-03 | 2016-08-24 | 浙江汉声精密机械有限公司 | 一种螺旋转子砂型 |
DE102015000370B4 (de) | 2015-01-20 | 2019-10-17 | Viessmann Werke Gmbh & Co Kg | Verfahren zur Herstellung eines mit einem Gewindegang versehenen Körpers |
JP6616239B2 (ja) * | 2015-12-09 | 2019-12-04 | 株式会社神戸製鋼所 | 中子造型方法および中子造型装置 |
BE1027183B1 (nl) * | 2019-04-09 | 2020-11-10 | Atlas Copco Airpower Nv | Werkwijze en inrichting voor het gieten van een rotor van een compressor-, vacuümpomp- en/of expanderinrichting met een longitudinale as |
CN112024824A (zh) * | 2020-08-18 | 2020-12-04 | 陕西理工大学 | 用于压缩机螺杆转子的成型模具 |
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DE7224272U (de) * | 1973-01-11 | Verschleiss Technik Wahl H | ||
US3267527A (en) * | 1962-11-05 | 1966-08-23 | George M Brown | Method and apparatus for making ceramic molds |
SE217570C1 (de) * | 1966-09-27 | 1967-12-12 | ||
DE3506475A1 (de) * | 1985-02-23 | 1986-08-28 | Gts Ges Fuer Turbo Und Schraub | Verfahren zur herstellung von rotoren fuer schraubenverdichter |
DE3528589A1 (de) * | 1985-08-09 | 1987-02-19 | Thyssen Industrie | Werkzeug zur herstellung von ungeteilten kernen oder formen aus sand fuer gussstuecke, die ein gewinde aufweisen |
US4899799A (en) * | 1988-06-09 | 1990-02-13 | Drazy Norman A | Helical compressor and method of making same |
GB2229121B (en) * | 1989-02-08 | 1992-06-10 | Frisby Engineering Limited | Production of screw elements |
-
1995
- 1995-07-14 DK DK95926880T patent/DK0721387T3/da active
- 1995-07-14 CN CN95190688A patent/CN1046442C/zh not_active Expired - Fee Related
- 1995-07-14 EP EP95926880A patent/EP0721387B1/de not_active Expired - Lifetime
- 1995-07-14 WO PCT/EP1995/002762 patent/WO1996003237A1/de active IP Right Grant
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1996
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Also Published As
Publication number | Publication date |
---|---|
CN1046442C (zh) | 1999-11-17 |
US5743321A (en) | 1998-04-28 |
DK0721387T3 (da) | 2000-05-29 |
CN1131398A (zh) | 1996-09-18 |
EP0721387A1 (de) | 1996-07-17 |
WO1996003237A1 (de) | 1996-02-08 |
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