WO1980002817A1 - Endless screw apparatus for preparing plastic or viscous materials for casting - Google Patents

Endless screw apparatus for preparing plastic or viscous materials for casting Download PDF

Info

Publication number
WO1980002817A1
WO1980002817A1 PCT/DE1980/000090 DE8000090W WO8002817A1 WO 1980002817 A1 WO1980002817 A1 WO 1980002817A1 DE 8000090 W DE8000090 W DE 8000090W WO 8002817 A1 WO8002817 A1 WO 8002817A1
Authority
WO
WIPO (PCT)
Prior art keywords
protection layer
wear protection
diamond particles
coated
screw machine
Prior art date
Application number
PCT/DE1980/000090
Other languages
German (de)
French (fr)
Inventor
R Fritsch
Original Assignee
R Fritsch
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by R Fritsch filed Critical R Fritsch
Publication of WO1980002817A1 publication Critical patent/WO1980002817A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/505—Screws
    • B29C48/507—Screws characterised by the material or their manufacturing process
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/68—Barrels or cylinders
    • B29C48/6801—Barrels or cylinders characterised by the material or their manufacturing process

Definitions

  • Screw machine for processing pourable, plastic or viscous masses.
  • the invention relates to a screw machine for processing pourable, plastic or viscous viscous masses, with a housing having a cavity and at least one material processing shaft arranged in the housing cavity, which is designed as a screw shaft over at least part of its length and with a surface in the surface areas wetted by the material to be processed Carbide wear protection layer is coated.
  • the invention was therefore based on the object, screw machines of the type mentioned, such as Compounding machines, extruders and the like. To improve so that they can be operated at a lower cost.
  • this object is achieved in that the wear protection layer is designed as an electroplating layer and diamond particles are embedded in it.
  • Such wear protection layers not only have a significantly longer service life than the sprayed boron carbide layers, but they can also be removed galvanically, so that the material processing shaft or its parts provided with the wear protection layer according to the invention can be reused without difficulty, i.e. can be re-plated.
  • the basic idea of the invention is also applied to the areas of the housing cavity surface which are subject to high wear, so that at least a part of this housing cavity surface is also coated with a galvanically applied carbide wear protection layer in which diamond particles are embedded, as a result of which the The service life of all highly stressed parts of the screw machine can be increased accordingly.
  • the matrix of the wear protection layer consists of chrome carbide, and the diamond particles have a grain size in the range from D 30 to D 500.
  • the material processing shaft or the housing cavity surface is only partially coated, it is advisable for machines for melting thermoplastic materials to coat the material processing shaft or the housing cavity surface at least in the area with the wear protection layer that receives diamond particles in which the materials are melted. In the case of a machine for mixing in hard additives, such as glass fibers in particular, it is advisable to coat the material processing shaft or the housing cavity surface at least in the area with the wear protection layer which absorbs diamond particles, in which the additives are added.
  • Fig. 1 shows a cross section through a worm machine with two mutually parallel, intermeshing worm shafts and
  • Fig. 2 is a side view and a partial section through a section of one of these worm shafts.
  • 1 has a housing 10 with a housing cavity 12, the wall of which is clad with a wear protection layer 14 according to the invention.
  • two core shafts 16 and 18 are rotatably and drivably mounted, on which a plurality of screw bushes 20 are pushed and secured against rotation on the core shafts.
  • FIG. 2 shows a piece of one of these core shafts with a screw bushing arranged thereon.
  • Known means e.g. a longitudinal groove with wedge.
  • the peripheral surface 20a of the metallic body 20b of the screw barrel 20 is clad with a wear protection layer 20c, which consists of a matrix of galvanically applied chromium carbide with diamond particles embedded therein.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

The endless screw apparatus for preparing plastic or viscous materials to be cast, comprises a frame having a cavity wherein one or a plurality of shafts are arranged for working the material conformed, at least on a portion of the length thereof, into an endless screw. The surface of the shaft areas and of the cavity wet by the material to be worked, is provided with a protection layer against wear (14, 20c) of chromium carbide, applied by galvanising, wherein diamond particles are embedded.

Description

Schneckenmaschine zur Bearbeitung schüttfähiger, plastischer oder zähviskoser Massen. Screw machine for processing pourable, plastic or viscous masses.
Die Erfindung betrifft eine Schneckenmaschine zur Bearbeitung schüttfähiger, plastischer oder zähviskoser Massen, mit einem einen Hohlraum aufweisenden Gehäuse und mindestens einer im Gehäusehohlraum angeordneten Materialbearbeitungswelle, die mindestens über einen Teil ihrer Länge als Schneckεnwelle ausgebildet und in den von dem zu bearbeitenden Material benetzten Oberflächenbereichen mit einer Karbid-Verschleißschutzschicht beschichtet ist.The invention relates to a screw machine for processing pourable, plastic or viscous viscous masses, with a housing having a cavity and at least one material processing shaft arranged in the housing cavity, which is designed as a screw shaft over at least part of its length and with a surface in the surface areas wetted by the material to be processed Carbide wear protection layer is coated.
Bei Schneckenmaschinen ist es üblich, auf eine Kernwelle sogenannte Schneckenbüchsen aufzuschieben, deren Umfangsflächen die bei der Materialbearbeitung wirksam werdenden Überflächenbereiche der Materialbearbeitungswelle bilden. Bei bekannten Schneckenmaschinen der eingangs erwähnten Art sind die ümfangsflächen der Schneckenbüchsen mit der erwähnten Verschleißschutzschicht versehen, die aus aufgesprühten und durch Erhitzen aufgesinterten Borkarbiden besteht. Nachteilig ist dabei nicht nur, daß das für die Herstellung der Verschleißschutzschicht unvermeidliche Erhitzen der Schneckenbüchsen die Einhaltung der gewünschten Präzision der Abmessungen dieser Schneckenbüchsen zumindest problematisch, wenn nicht gar unmöglich macht, sondern bei einer teilweisen Abnutzung der Verschleißschutzschicht ist es äußerst schwierig oder gar unmöglich, die Reste der Verschleißschutzschicht zu ent fernen, um die Schneckenbüchsen wieder verwenden zu können. Schließlich lassen die bekannten BorkarbidVerschleißschutzschichten hinsichtlich ihrer Standzeiten zu wünschen übrig, vor allem dann, wenn glasfaserverstärkte Kunststoffe oder Kunststoffe mit anderen harten Füll- und Zuschlagstoffen barbeitet werden müssen.In worm machines, it is customary to push so-called screw bushes onto a core shaft, the peripheral surfaces of which form the surface areas of the material processing shaft that become effective during material processing. In known screw machines of the type mentioned in the introduction, the circumferential surfaces of the screw bushes are provided with the abovementioned wear protection layer, which consists of boron carbides sprayed on and sintered on by heating. The disadvantage here is not only that the heating of the screw bushes, which is inevitable for the production of the wear protection layer, at least makes it difficult, if not impossible, to maintain the desired precision of the dimensions of these screw bushings, but it is extremely difficult or even impossible if the wear protection layer is partially worn. to remove the remnants of the wear protection layer far away in order to be able to use the snail bushes again. Finally, the known boron carbide wear protection layers leave something to be desired in terms of their service life, especially when glass fiber reinforced plastics or plastics with other hard fillers and additives have to be processed.
Der Erfindung lag deshalb die Aufgabe zugrunde, Schnekkenmaschinen der eingangs erwähnten Art, wie z.B. Compoundiermaschinen, Extruder und dergl., so zu verbessern, daß sie mit geringerem Kostenaufwand betrieben werden können. Erfindungsgemäß wird diese Aufgabe dadurch gelöst, daß die Verschleißschutzschicht als Galvanikschicht ausgebildet wird, und in sie Diamantpartikel eingebettet sind. Derartige Verschleißschutzschichten weisen nicht nur wesentlich höhere Standzeiten als die aufgesprühten Borkarbidschichten auf, sondern sie lassen sich galvanisch auch wieder abtragen, so daß die Materialbearbeitungswelle bzw. deren mit der erfindungsgemäßen Verschleißschutzschicht versehene Teile ohne Schwierigkeiten wieder verwendet, d.h. neu plattiert werden können.The invention was therefore based on the object, screw machines of the type mentioned, such as Compounding machines, extruders and the like. To improve so that they can be operated at a lower cost. According to the invention, this object is achieved in that the wear protection layer is designed as an electroplating layer and diamond particles are embedded in it. Such wear protection layers not only have a significantly longer service life than the sprayed boron carbide layers, but they can also be removed galvanically, so that the material processing shaft or its parts provided with the wear protection layer according to the invention can be reused without difficulty, i.e. can be re-plated.
Es ist von Vorteil, wenn man den Grundgedanken der Erfindung auch auf die einem hohen Verschleiß ausgesetzten Bereiche der Gehäusehohlraumoberfläche anwendet, so daß mindestens ein Teil dieser Gehäusehohlraumoberfläche gleichfalls mit einer galvanisch aufgebrachten Karbid-Verschleißschutzschicht beschichtet ist, in die Diamantpartikel eingebettet sind, wodurch dann die Standzeiten aller hochbeanspruchten Teile der Schneckenmaschine entsprechend erhöht werden. Bei einer besonders bevorzugten Ausführungsform besteht die Matrix der Verschleißschutzschicht aus Chromkarbid, und die Diamantpartikel weisen eine Körnung im Bereich von D 30 bis D 500 auf.It is advantageous if the basic idea of the invention is also applied to the areas of the housing cavity surface which are subject to high wear, so that at least a part of this housing cavity surface is also coated with a galvanically applied carbide wear protection layer in which diamond particles are embedded, as a result of which the The service life of all highly stressed parts of the screw machine can be increased accordingly. In a particularly preferred embodiment, the matrix of the wear protection layer consists of chrome carbide, and the diamond particles have a grain size in the range from D 30 to D 500.
Wenn die Materialbearbeitungswelle bzw.die Gehäusehohlraumfläche nur teilweise beschichtet wird, empfiehlt sich bei Maschinen zum Aufschmelzen thermoplastischer Materialien die Materialbearbeitungswelle bzw. die Gehäusehohlraumoberfläche mindestens in demjenigen Bereich mit der Diamantpartikel aufnehmenden Verschleißschutzschicht zu beschichten, in dem die Materialien aufgeschmolzen werden. Bei einer Maschine zum Einmischen von harten Zuschlagstoffen, wie insbesondere Glasfasern, empfiehlt es sich, die Materialbearbeitungswelle bzw. die Gehäusehohlraumoberfläche mindestens in demjenigen Bereich mit der Diamantpartikel aufnehmenden Verschleißschutzschicht zu beschichten, in dem die Zuschlagstoffe zugegeben werden.If the material processing shaft or the housing cavity surface is only partially coated, it is advisable for machines for melting thermoplastic materials to coat the material processing shaft or the housing cavity surface at least in the area with the wear protection layer that receives diamond particles in which the materials are melted. In the case of a machine for mixing in hard additives, such as glass fibers in particular, it is advisable to coat the material processing shaft or the housing cavity surface at least in the area with the wear protection layer which absorbs diamond particles, in which the additives are added.
Weitere Merkmale, Vorteile und Einzelheiten der Erfindüng ergeben sich aus der nachfolgenden Beschreibung und der beigefügten zeichnerischen Darstellung einer bevorzugten Ausführungsform einer erfindungsgemäßen Schneckenmaschine; es zeigen:Further features, advantages and details of the invention arise from the following description and the attached drawing of a preferred embodiment of a screw machine according to the invention; show it:
Fig. 1 einen Querschnitt durch eine Schneckenmaschine mit zwei zueinander parallelen, miteinander kämmenden Schneckenwellen undFig. 1 shows a cross section through a worm machine with two mutually parallel, intermeshing worm shafts and
Fig. 2 eine Seitenansicht und einen Teilschnitt durch ein Teilstück einer dieser Schneckenwellen. Die in bekannter Art und Weise aufgebaute Doppelschnekkenmaschine gemäß Fig. 1 besitzt ein Gehäuse 10 mit einem Gehäusehohlraum 12, dessen Wandung mit einer erfin- dungsgemäßen VerschleißSchutzschicht 14 plattiert ist.Fig. 2 is a side view and a partial section through a section of one of these worm shafts. 1 has a housing 10 with a housing cavity 12, the wall of which is clad with a wear protection layer 14 according to the invention.
In dem Gehäusehohlraum 12 sind zwei Kernwellen 16 und 18 dreh- und antreibbar gelagert, auf die mehrere Schneckenbüchsen 20 aufgeschoben und gegen ein Verdrehen auf den Kernwellen gesichert sind.In the housing cavity 12, two core shafts 16 and 18 are rotatably and drivably mounted, on which a plurality of screw bushes 20 are pushed and secured against rotation on the core shafts.
Die Fig. 2 zeigt ein Stück einer dieser Kernwellen mit einer darauf angeordneten Schneckenbuch.se. Der Mitnahme der Schneckenbüchse 20 dienen bekannte Mittel, z.B. eine Längsnut mit Keil. Die Umfangsflache 20a des metallischen Körpers 20b der Schneckenbüchse 20 ist mit einer Verschleißschutzschicht 20c plattiert, die aus einer Matrix aus galvanisch aufgebrachtem Chromkarbid mit darin eingebetteten Diamantpartikeln besteht. 2 shows a piece of one of these core shafts with a screw bushing arranged thereon. Known means, e.g. a longitudinal groove with wedge. The peripheral surface 20a of the metallic body 20b of the screw barrel 20 is clad with a wear protection layer 20c, which consists of a matrix of galvanically applied chromium carbide with diamond particles embedded therein.

Claims

A n s p r ü c h e : Expectations :
1. Schneckenmaschine zur Bearbeitung schüttfähiger, plastischer oder zähviskoser Massen, mit einem einen Hohlraum aufweisenden Gehäuse und mindestens einer im Gehäusehohlraum angeordneten Materialbearbeitungswelle, die mindestens über einen Teil ihrer Länge als Schneckenwelle ausgebildet und in den von dem zu bearbeitenden Material benetzten Oberflächenbereichen mit einer Karbid-Verschleißschutzschicht beschichtet ist, dadurch gekennzeichnet, daß in die galvanisch aufgebrachte Karbid-Verschleißschutzschicht (20c) Diamant- partikel eingebettet sind.1. Screw machine for processing pourable, plastic or viscous viscous masses, with a housing having a cavity and at least one material processing shaft arranged in the housing cavity, which is designed as a worm shaft over at least part of its length and is coated with a carbide in the surface areas wetted by the material to be processed. Wear protection layer is coated, characterized in that diamond particles are embedded in the galvanically applied carbide wear protection layer (20c).
2. Schneckenmaschine nach Anspruch 1, dadurch gekennzeichnet, daß mindestens ein Teil der Gehäusehohlraumoberfläche (12) gleichfalls mit einer galvanisch aufgebrachten Karbid-Verschleißschutzschicht (14) beschichtet ist, in die Diamantpartikel eingebettet sind.2. Screw machine according to claim 1, characterized in that at least a part of the housing cavity surface (12) is also coated with an electroplated carbide wear protection layer (14) in which diamond particles are embedded.
3. Schneckenmaschine nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Matrix der VerschleißSchutzschicht (20c; 14) aus Chromkarbid besteht.3. Screw machine according to claim 1 or 2, characterized in that the matrix of the wear protection layer (20c; 14) consists of chromium carbide.
4. Schneckenmaschine nach einem oder mehreren der vorstehenden Ansprüche, dadurch gekennzeichnet, daß die Diamantpartikel eine Körnung im Bereich von D 30 bis D 500 aufweisen. 4. Screw machine according to one or more of the preceding claims, characterized in that the diamond particles have a grain size in the range from D 30 to D 500.
5. Schneckenmaschine nach einem oder mehreren der vorstehenden Ansprüche, dadurch gekennzeichnet, daß bei einer Maschine zum Aufschmelzen thermoplastischer Materialien die Materialbearbeitungswelle bzw. die Gehäusehohlraumoberfläche mindestens in demjenigen Bereich mit der Diamantpartikel aufnehmenden Verschleißschutzschicht beschichtet ist, in dem die Materialien aufgeschmolzen werden.5. Screw machine according to one or more of the preceding claims, characterized in that in a machine for melting thermoplastic materials, the material processing shaft or the housing cavity surface is coated at least in that area with the wear protection layer receiving diamond particles in which the materials are melted.
6. Schneckenwelle nach einem oder mehreren der vorstehenden Ansprüche, dadurch gekennzeichnet, daß bei einer Maschine zum Einmischen von harten Zuschlagstoffen, wie Glasfasern, die Materialbearbeitungswelle bzw. die Gehäusehohlraumoberfläche mindestens in demjenigen Bereich mit der Diamantpartikel aufnehmenden Verschleißschutzschicht beschichtet ist, in dem die Zuschlagstoffe zugegeben werden. 6. worm shaft according to one or more of the preceding claims, characterized in that in a machine for mixing in hard additives, such as glass fibers, the material processing shaft or the housing cavity surface is coated at least in that area with the wear-resistant layer receiving the diamond particles, in which the additives are added become.
PCT/DE1980/000090 1979-06-18 1980-06-18 Endless screw apparatus for preparing plastic or viscous materials for casting WO1980002817A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2924507 1979-06-18
DE19792924507 DE2924507A1 (en) 1979-06-18 1979-06-18 MEASURING SCREW MACHINE FOR MACHINING SHEET-CAPABLE, PLASTIC OR TOOTH-VISCOSED

Publications (1)

Publication Number Publication Date
WO1980002817A1 true WO1980002817A1 (en) 1980-12-24

Family

ID=6073475

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1980/000090 WO1980002817A1 (en) 1979-06-18 1980-06-18 Endless screw apparatus for preparing plastic or viscous materials for casting

Country Status (2)

Country Link
DE (1) DE2924507A1 (en)
WO (1) WO1980002817A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995002078A1 (en) * 1993-07-09 1995-01-19 Sandvik Ab Diamond coated body

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050274215A1 (en) * 2004-06-15 2005-12-15 Geoff Bishop Worm gear assembly having improved physical properties and method of making same

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3295941A (en) * 1963-06-26 1967-01-03 Du Pont Diamond reinforced coatings and method of preparing same
FR2143332A1 (en) * 1971-06-23 1973-02-02 Di Coat Corp
US3998318A (en) * 1975-03-31 1976-12-21 The Pantasote Company Extruder screw
US4089466A (en) * 1977-03-30 1978-05-16 Lomax Donald P Lining alloy for bimetallic cylinders
DE2811225A1 (en) * 1977-03-16 1978-09-28 Glacier Metal Co Ltd METHOD AND DEVICE FOR REDUCING METAL OXIDES

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3295941A (en) * 1963-06-26 1967-01-03 Du Pont Diamond reinforced coatings and method of preparing same
FR2143332A1 (en) * 1971-06-23 1973-02-02 Di Coat Corp
US3998318A (en) * 1975-03-31 1976-12-21 The Pantasote Company Extruder screw
DE2811225A1 (en) * 1977-03-16 1978-09-28 Glacier Metal Co Ltd METHOD AND DEVICE FOR REDUCING METAL OXIDES
US4089466A (en) * 1977-03-30 1978-05-16 Lomax Donald P Lining alloy for bimetallic cylinders

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995002078A1 (en) * 1993-07-09 1995-01-19 Sandvik Ab Diamond coated body
US5543210A (en) * 1993-07-09 1996-08-06 Sandvik Ab Diamond coated body

Also Published As

Publication number Publication date
DE2924507A1 (en) 1981-01-15

Similar Documents

Publication Publication Date Title
DE2256671B1 (en) PROCESS FOR WEAR RESISTANT LINING OF EXTRUDER HOUSING BORES AND WEAR PROTECTIVE LINING MANUFACTURED BY THIS PROCESS
DE1729345A1 (en) Double screw housing with a wear-resistant inner coating for plastic, especially thermoplastic extruders
EP0995565B1 (en) Apparatus for continuous treatment of flowable material
DE102021110900A1 (en) METHOD OF MANUFACTURING GEAR, GEAR AND GEAR DEVICE OF THE BENDING ENGAGEMENT TYPE
DE4031685A1 (en) WHEEL BLOCK
DE3142196A1 (en) Continuous casting mould with different coating layers of metal, and process for the manufacture thereof
WO1980002817A1 (en) Endless screw apparatus for preparing plastic or viscous materials for casting
EP0035010B1 (en) Apparatus for the manufacture of profiled plate-like moulded articles of concrete or the like, preferably roof tiles
DE3312197C2 (en)
DE102016104334B4 (en) Mixing tool manufacturing process
DE2751873C2 (en) Friction disc for a false wire spindle
DE7244106U (en) Bushing for a twin screw housing of a plastic or rubber extruder
EP1613867B1 (en) Roller coating method and coated roller
EP0906781A2 (en) Mixing tool
CH676215A5 (en) Long life chain-saw blade
DE10161363A1 (en) Wear resistant plastics processing screw and cylinder have different wear resistant coatings along the screw or cylinder length
DE2642801A1 (en) Wear protecting device for transport worm - consists of metal plate with wear resisting layer of rubber attached to worm surface
DE10163519B4 (en) Plasticizing extruder for the production of fiber-reinforced plastic materials
DE3637439A1 (en) Wear-resistant lining for containers, in particular drum mills
DE102016119858A1 (en) Cylinder for a plastic processing machine
DE4414582C1 (en) Conical mixing screw
DE3239906A1 (en) DEVICE FOR PRODUCING A MIXTURE
CH658815A5 (en) Method of producing worms, with a worm-thread face provided with wear-resistant material, and use of the worm
DE9105266U1 (en) Blast wheel - Shovel
DE2204055A1 (en) Segmented extruder screw - with electrochemically or electrical discharge eroded fixing keyways

Legal Events

Date Code Title Description
AK Designated states

Designated state(s): JP US