DE3448025C2 - - Google Patents

Info

Publication number
DE3448025C2
DE3448025C2 DE3448025A DE3448025A DE3448025C2 DE 3448025 C2 DE3448025 C2 DE 3448025C2 DE 3448025 A DE3448025 A DE 3448025A DE 3448025 A DE3448025 A DE 3448025A DE 3448025 C2 DE3448025 C2 DE 3448025C2
Authority
DE
Germany
Prior art keywords
rotor
screw
rotor body
die
rotors
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
Application number
DE3448025A
Other languages
German (de)
Other versions
DE3448025C3 (en
DE3448025A1 (en
Inventor
Guenter 5090 Leverkusen De Kirsten
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GTS GESELLSCHAFT fur TURBO- und SCHRAUBENVERDICHTERTECHNIK KIRSTEN KG 5090 LEVERKUSEN DE
Original Assignee
GTS GESELLSCHAFT fur TURBO- und SCHRAUBENVERDICHTERTECHNIK KIRSTEN KG 5090 LEVERKUSEN DE
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 GTS GESELLSCHAFT fur TURBO- und SCHRAUBENVERDICHTERTECHNIK KIRSTEN KG 5090 LEVERKUSEN DE filed Critical GTS GESELLSCHAFT fur TURBO- und SCHRAUBENVERDICHTERTECHNIK KIRSTEN KG 5090 LEVERKUSEN DE
Priority to DE3448025A priority Critical patent/DE3448025C3/en
Publication of DE3448025A1 publication Critical patent/DE3448025A1/en
Application granted granted Critical
Publication of DE3448025C2 publication Critical patent/DE3448025C2/de
Publication of DE3448025C3 publication Critical patent/DE3448025C3/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/08Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C18/082Details specially related to intermeshing engagement type pumps
    • F04C18/084Toothed wheels
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C37/00Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
    • B29C37/0003Discharging moulded articles from the mould
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/26Moulds
    • B29C45/2618Moulds having screw-threaded mould walls
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/68Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
    • B29C70/72Encapsulating inserts having non-encapsulated projections, e.g. extremities or terminal portions of electrical components
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00Moulds or cores; Details thereof or accessories therefor
    • B29C33/42Moulds or cores; Details thereof or accessories therefor characterised by the shape of the moulding surface, e.g. ribs or grooves
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29LINDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00Other particular articles
    • B29L2031/748Machines or parts thereof not otherwise provided for
    • B29L2031/7498Rotors

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)

Description

Die Erfindung betrifft ein Verfahren zur Herstellung von Rotoren für Schraubenverdichter sowie Vorrichtungen zur Durchführung des Verfahrens.The invention relates to a method for manufacturing of rotors for screw compressors and devices to carry out the procedure.

Schraubenverdichter zum Verdichten von Gasen haben zwei mit unterschiedlichen schraubenförmigen Profilen ver­ sehene Rotoren, von denen der eine einen Hauptläufer und der andere einen Nebenläufer bildet. Diese Rotore werden aufgrund ihres komplizierten Profils in der Re­ gel im Abwälzfräsverfahren mit Profilfräsern herge­ stellt. Dieses Verfahren erfordert hohe Investitionen an Maschinen und Fräswerkzeugen. Da sich die Fräswerk­ zeuge abnutzen, ist wegen der geforderten hohen Maß­ haltigkeit der Rotore ein ständiges Nacharbeiten der Fräswerkzeuge erforderlich. Ein weiterer Nachteil des bekannten Herstellungsverfahrens besteht darin, daß die Formen der Schraubenprofile beschränkt sind. So lassen sich beispielsweise Schraubenprofile mit bestimmten Hinterschneidungen nicht im Fräsverfahren herstellen.Screw compressors for compressing gases have two with different helical profiles seen rotors, one of which is a main rotor and the other is a runner. These rotors due to their complicated profile in the Re Gel in the hobbing process with profile cutters poses. This process requires high investments on machines and milling tools. Since the milling machine Wear and tear is due to the high degree required durability of the rotors a constant reworking of the Milling tools required. Another disadvantage of known manufacturing process is that the  Shapes of the screw profiles are limited. Let it be for example, screw profiles with certain Do not create undercuts in the milling process.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren der eingangs genannten Art anzugeben, das eine ein­ fachere Herstellung der Rotore ermöglicht und auch solche Schraubenprofile herzustellen gestattet, die wegen ihrer Profilform nach den üblichen Verfahren nicht hergestellt werden können.The invention has for its object a method of the type mentioned at the beginning, the one enables more professional manufacture of the rotors and also allowed to produce such screw profiles that because of their profile shape according to the usual procedures cannot be manufactured.

Die Lösung dieser Aufgabe besteht nach der Erfindung darin, daß ein Kunststoff in eine entsprechend einer Negativform des Rotorkörpers ausgebildeten Formmatrize hinein extrudiert wird.This object is achieved according to the invention in that a plastic in a corresponding one Negative form of the rotor body formed form die is extruded into it.

In der Formmatrize entsteht eine im Prinzip endlose Kunststoffschraube mit dem Profil des Rotorkörpers. Während der Kunststoff im wesentlichen axial aus dem Extruder herausgedrückt wird, wird dieses Material durch das Schraubenprofil der Formmatrize gedreht, so daß der Kunststoff in der Formmatrize nicht nur axial vorgeschoben, sondern auch drehend angetrieben wird. Die Rotorkörper können von dem entstehenden Strang abgetrennt werden. Zweckmäßigerweise ist der Strang zusätzlich durch Verstärkungsfasern, die in die Form­ matrize einlaufen, verstärkt.In principle, an endless one is created in the molding die Plastic screw with the profile of the rotor body. While the plastic is essentially axially from the Extruder is pushed out, this material rotated by the screw profile of the form die, so that the plastic is not only axial in the mold advanced, but is also driven in rotation. The rotor body can from the resulting strand be separated. The strand is expedient additionally by reinforcing fibers that are in the form shrink matrix, reinforced.

Eine Vorrichtung zur Durchführung des Verfahrens ist dadurch gekennzeichnet, daß im Anschluß an das Aus­ trittsende eines Extruders die für den fortlaufenden Austritt des rotierenden Rotorkörpers offene Form­ matrize angeordnet ist. An dem Extruder kann ein Dorn befestigt sein, der in dem Rotorkörper einen axialen Kanal zum Befestigen der Rotorwelle erzeugt.An apparatus for performing the method is characterized in that following the end kick end of an extruder for the continuous Exit of the rotating rotor body open form matrix is arranged. A mandrel can be attached to the extruder be attached to an axial in the rotor body Channel for attaching the rotor shaft generated.

Im folgenden werden unter Bezugnahme auf die Zeichnun­ gen Ausführungsbeispiele der Erfindung näher erläutert.In the following with reference to the drawing gene embodiments of the invention explained in more detail.

Es zeigen:Show it:

Fig. 1 das Prinzip des Zusammenwirkens der beiden Rotoren eines Schraubenverdichters, Fig. 1 shows the principle of the interaction of the two rotors of a screw compressor,

Fig. 2 eine Seitenansicht des Nebenrotors, Fig. 2 is a side view of the slave rotor,

Fig. 3 einen Längsschnitt durch eine Vorrichtung zur Herstellung von Rotorprofilen im Extrusions­ verfahren und Fig methods. 3 is a longitudinal section through a device for the production of the rotor profiles in the extrusion and

Fig. 4 eine Abwandlung der Vorrichtung nach Fig. 3. Fig. 4 shows a modification of the device of FIG. 3.

In Fig. 1 ist das Zusammenwirken der beiden Rotoren eines Schraubenverdichters dargestellt. Der Hauptrotor 10 weist mehrere über seinen Umfang verteilt angeordne­ te abstehende Zähne 12 auf, die in Längsrichtung des Rotors schraubenförmig verlaufen. Die Zähne 12, die in die schraubenförmigen Zahnlücken 13 des Nebenrotors eintauchen, haben Flanken, deren Kontur sehr genau ein­ gehalten werden muß, um die gewünschte Verdichtung zu erreichen. In gleicher Weise müssen auch die die Zahn­ lücken 13 begrenzenden Wände des Nebenrotors 11 mit ganz bestimmten Formen und mit großer Genauigkeit her­ gestellt werden. Die dargestellten Rotoren 10 und 11 haben relativ einfache Schraubenprofile. In manchen Fällen ist es zweckmäßig, Schraubenprofile zu verwen­ den, die Hinterschneidungen haben, d.h. Hohlräume, die durch eine Flanke begrenzt sind, welche einen radialen Zugang zu dem Hohlraum nicht zuläßt. In Fig. 1, the interaction of the two rotors of a screw compressor is shown. The main rotor 10 has a plurality of teeth 12 which are distributed over its circumference and which extend helically in the longitudinal direction of the rotor. The teeth 12 , which dip into the helical tooth spaces 13 of the secondary rotor, have flanks, the contour of which must be kept very precisely in order to achieve the desired compression. In the same way, the tooth gaps 13 bounding walls of the secondary rotor 11 must be made with very specific shapes and with great accuracy. The rotors 10 and 11 shown have relatively simple screw profiles. In some cases, it is useful to use the screw profiles that have undercuts, ie cavities that are delimited by a flank that does not allow radial access to the cavity.

Fig. 2 zeigt eine Seitenansicht des Nebenrotors 11. Hieraus ist die Rotorwelle 14 zu ersehen, die sich durch den Rotorkörper 15 hindurch erstreckt. Der Rotor ist einstückig angefertigt. Fig. 2 shows a side view of the sub rotor 11. This shows the rotor shaft 14 , which extends through the rotor body 15 . The rotor is made in one piece.

Bei dem Ausführungsbeispiel der Fign. 3 und 4 erfolgt die Herstellung der Rotorkörper mit Hilfe eines Ex­ truders 52, an dessen Ende eine Formmatrize 53 be­ festigt ist. Das Extrudat gelangt vom Extruder aus in die Formmatrize 53, die entsprechend einem Negativ des herzustellenden Rotorkörpers profiliert ist. Die Form­ matrize 53 weist daher mehrere Schraubengänge auf. Das aus dem Extruder austretende Material gelangt in die Formmatrize 53 und wird in dieser durch den Extrusions­ druck nicht nur vorgeschoben, sondern infolge der schraubenförmigen Wandkontur der Formmatrize auch in Drehung versetzt. Während des schraubenförmigen Hin­ durchbewegens durch die Formmatrize 53 wird das Extru­ dat gekühlt, so daß es sich zunehmend verfestigt und schließlich als endlose Schnecke die Formmatrize ver­ läßt. Dabei entstehen die in Fig. 3 dargestellten Zonen. In der Füllzone wird die Formmatrize 53 hohl­ raumfrei mit dem Extrudat ausgefüllt. In der nachfol­ genden Kühlzone erstarrt das Extrudat, während es in der Ausstoßzone seine endgültige Form annimmt. An die Ausstoßzone schließt sich der Abgangsbereich an, der den Auslaß der Formmatrize bildet.In the embodiment of FIGS. 3 and 4 takes place the manufacture of the rotor body with the help of an ex truder 52 , at the end of which a die 53 is fastened. The extrudate passes from the extruder into the forming die 53 , which is profiled in accordance with a negative of the rotor body to be produced. The form die 53 therefore has a plurality of screw turns. The material emerging from the extruder gets into the die 53 and is not only pushed forward in this by the extrusion pressure, but also set in rotation due to the helical wall contour of the die. During the helical movement through through the die 53 , the extrusion dat is cooled, so that it becomes increasingly solidified and finally the die can be ver as an endless screw. This creates the zones shown in FIG. 3. In the filling zone, the die 53 is filled with the extrudate in a hollow space. The extrudate solidifies in the subsequent cooling zone, while it takes on its final shape in the discharge zone. The discharge area, which forms the outlet of the molding die, adjoins the discharge zone.

Bei dem Ausführungsbeispiel der Fig. 4 ist an der Extruderwelle ein Dorn 54 befestigt, der sich bis weit in die Formmatrize 53 hinein erstreckt und in dem her­ zustellenden Rotorstrang einen Kanal erzeugt, in den später die Rotorwelle eingesetzt werden kann. In the embodiment of FIG. 4, a mandrel 54 is attached to the extruder shaft, which extends far into the forming die 53 and creates a channel in the rotor strand to be produced, into which the rotor shaft can later be inserted.

Mit den Vorrichtungen nach Fign. 3 und 4 werden die Rotorkörper als endlose Schrauben hergestellt, von denen geeignete Stücke abgetrennt werden können. Es ist zu beachten, daß für die Herstellung der Hauptrotore die Drehrichtung entgegengesetzt zu der Drehrichtung bei der Herstellung von Nebenrotoren ist.With the devices according to FIGS. 3 and 4 , the rotor bodies are manufactured as endless screws, from which suitable pieces can be separated. It should be noted that the direction of rotation for the manufacture of the main rotors is opposite to the direction of rotation for the manufacture of secondary rotors.

Claims (3)

1. Verfahren zur Herstellung von Rotoren für Schraubenverdichter, dadurch gekennzeichnet, daß ein Kunststoff in eine entsprechend einer Negativform des Rotorkörpers ausgebildete Form­ matrize (53) hinein extrudiert wird.1. A method for producing rotors for screw compressors, characterized in that a plastic is extruded into a mold ( 53 ) formed in accordance with a negative shape of the rotor body. 2. Vorrichtung zur Durchführung des Verfahrens nach Anspruch 1, dadurch gekennzeichnet, daß im An­ schluß an das Austrittsende eines Extruders (52) die für den fortlaufenden Austritt des rotierenden Rotorkörpers offene Formmatrize (53) angeordnet ist.2. Device for performing the method according to claim 1, characterized in that in the connection to the outlet end of an extruder ( 52 ) is arranged for the continuous exit of the rotating rotor body mold die ( 53 ). 3. Vorrichtung nach Anspruch 2, dadurch gekennzeich­ net, daß an der Schnecke des Extruders (52) ein Dorn (54) befestigt ist, der in dem Rotorkörper einen axialen Kanal zum Befestigen der Rotorwelle erzeugt.3. Apparatus according to claim 2, characterized in that a mandrel ( 54 ) is attached to the screw of the extruder ( 52 ), which generates an axial channel in the rotor body for fastening the rotor shaft.
DE3448025A 1984-06-30 1984-06-30 Process for the manufacture of rotors for screw compressors Expired - Fee Related DE3448025C3 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE3448025A DE3448025C3 (en) 1984-06-30 1984-06-30 Process for the manufacture of rotors for screw compressors

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3448025A DE3448025C3 (en) 1984-06-30 1984-06-30 Process for the manufacture of rotors for screw compressors
DE19843424148 DE3424148A1 (en) 1984-06-30 1984-06-30 Method of manufacturing rotors for screw-type compressors

Publications (3)

Publication Number Publication Date
DE3448025A1 DE3448025A1 (en) 1986-05-28
DE3448025C2 true DE3448025C2 (en) 1988-01-21
DE3448025C3 DE3448025C3 (en) 1995-03-23

Family

ID=6239534

Family Applications (2)

Application Number Title Priority Date Filing Date
DE19843424148 Granted DE3424148A1 (en) 1984-06-30 1984-06-30 Method of manufacturing rotors for screw-type compressors
DE3448025A Expired - Fee Related DE3448025C3 (en) 1984-06-30 1984-06-30 Process for the manufacture of rotors for screw compressors

Family Applications Before (1)

Application Number Title Priority Date Filing Date
DE19843424148 Granted DE3424148A1 (en) 1984-06-30 1984-06-30 Method of manufacturing rotors for screw-type compressors

Country Status (1)

Country Link
DE (2) DE3424148A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3506475A1 (en) * 1985-02-23 1986-08-28 Gts Ges Fuer Turbo Und Schraub Method for the manufacture of rotors for screw-type compressors
SE470337B (en) * 1986-09-05 1994-01-24 Svenska Rotor Maskiner Ab Rotor for a screw rotor machine and the procedure for its manufacture
JPS63243478A (en) * 1987-03-30 1988-10-11 Aisin Seiki Co Ltd Rotor for fluid equipment
SE468122B (en) * 1990-04-27 1992-11-09 Svenska Rotor Maskiner Ab ROTOR OPERATES A SCREW ROTOR, A SCREW ROTOR, AND A PROCEDURE FOR MANUFACTURING A ROTOR
DE19502323C2 (en) * 1995-01-26 1997-09-18 Guenter Kirsten Process for the manufacture of rotors of screw compressors
CN107470597A (en) * 2017-08-11 2017-12-15 保定东峰铸造有限公司 A kind of special equipment and casting method of the screw feeder demoulding

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1660646U (en) 1953-03-24 1953-08-06 Buehler & Co CAN WITH SPRING LID.
DE1018219B (en) * 1954-09-01 1957-10-24 Alkett Maschb Ges Mit Beschrae Attachment piece to be attached behind the outlet of an injection molding cylinder for thermoplastic masses
US3567569A (en) * 1965-08-09 1971-03-02 Toyo Rayon Co Ltd Synthetic fibers having novel shape
DE1508723B1 (en) 1966-09-24 1969-09-04 Svenska Rotor Maskiner Ab Molding device for the production of molds for helical bodies
US3828628A (en) 1970-11-24 1974-08-13 Peugeot & Renault Methods of extruding helical gear blanks
DE2409554A1 (en) 1974-02-28 1975-09-11 H & H Licensing Corp Rotors in screw compressor - formed by glass fibre reinforced heat resistant polyamide injected on metal shaft
US4287749A (en) * 1979-11-15 1981-09-08 Ford Motor Company Tapered extrusion die and method of forming the same
US4337800A (en) 1980-07-07 1982-07-06 Steward Plastics, Inc. Two piece extruded hose
IT1136763B (en) 1981-05-27 1986-09-03 Lombarde Ind Plastiche DEVICE FOR THE CONTINUOUS PRODUCTION OF EXTRUDED PIPES REINFORCED BY METALLIC WIRE HELICALLY WRAPPED

Also Published As

Publication number Publication date
DE3448025C3 (en) 1995-03-23
DE3424148C2 (en) 1988-02-25
DE3448025A1 (en) 1986-05-28
DE3424148A1 (en) 1986-01-09

Similar Documents

Publication Publication Date Title
EP0431681B1 (en) Method and extrusion tool for making a blank with internal bores
DE4120165A1 (en) EXTRACTION TOOL FOR PRODUCING A HARD METAL OR CERAMIC BAR
DE2426492C2 (en) Method and apparatus for the continuous manufacture of striped soap bars
DE69311850T2 (en) Multi-part extrusion mouthpiece
DE4120166A1 (en) EXTRACTION TOOL FOR PRODUCING A HARD METAL OR CERAMIC BAR WITH TWISTED INTERNAL HOLES
DE19858102A1 (en) Multi-component brush body, especially for tooth brush comprises thin walled basic body and additional material areas whose cooling times after injection run simultaneously
DE2811468C2 (en) Extrusion press
DE2943230C2 (en) Kneading device for plastic mixtures
DE2108936A1 (en) Method and device for the production of partially foamed plastic semi-finished products
DE1945675B2 (en) PROCESS AND DEVICE FOR MANUFACTURING HOSES FROM RUBBER OR OTHER PLASTICIZABLE COMPOSITIONS WITH STRONG REINFORCING INSERTS IN THE HOSE LENGTH DIRECTION
EP1042086B1 (en) Method for the production of a drilling tool for machine tools
DE2415896A1 (en) SCREW PRESS
EP0513593B1 (en) Device for the extrusion of plastic and rubber compounds
DE69634308T2 (en) METHOD FOR CONTINUOUS PRODUCTION OF PROFILED PARTS AND DEVICE FOR CARRYING OUT THE METHOD
EP1396331B1 (en) Cord-like seal for vehicle, process and apparatus for manufacturing it
DE3448025C2 (en)
DE4433487C2 (en) Planetary roller extruder
DE2616177A1 (en) PROCESS FOR THE CONTINUOUS MANUFACTURING OF ENDLESS TIMING BELTS OF ANY SIZE
DE2920916A1 (en) METHOD FOR PRODUCING AN ARMORED ENDLESS TIMING BELT FROM PLASTIC WITH A MINUS TOLERANCE OF THE BELT CIRCUMFERENCE LENGTH
DE19703798A1 (en) Gear extruder
DE3874203T2 (en) METHOD FOR PRODUCING AN INJECTION MOLD FOR MOLDING SCREW-MOLDED EXTRUDED PARTICLES.
DE69704289T2 (en) Method and device for mixing with continuous rolls of thermoplastic material
DE4114609C2 (en) High-performance extruder with a constant number of gears in the inlet and outlet area of a transfer shear part
DE10354172A1 (en) Extrusion plant for melts with high filler content has extruder used alone or in tandem with a second extruder and barrel inner wall has screw flight profiling to increase melt pressure
EP1336465A1 (en) Method for manufacturing an extruder cylinder with a lining

Legal Events

Date Code Title Description
AC Divided out of

Ref country code: DE

Ref document number: 3424148

Format of ref document f/p: P

OP8 Request for examination as to paragraph 44 patent law
AC Divided out of

Ref country code: DE

Ref document number: 3424148

Format of ref document f/p: P

D2 Grant after examination
AC Divided out of

Ref country code: DE

Ref document number: 3424148

Format of ref document f/p: P

8363 Opposition against the patent
8366 Restricted maintained after opposition proceedings
8305 Restricted maintenance of patent after opposition
AC Divided out of

Ref country code: DE

Ref document number: 3424148

Format of ref document f/p: P

D4 Patent maintained restricted
8339 Ceased/non-payment of the annual fee