WO2003051604A1 - Clapet antiretour comportant une couche de protection antiusure et procede de fabrication - Google Patents

Clapet antiretour comportant une couche de protection antiusure et procede de fabrication Download PDF

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Publication number
WO2003051604A1
WO2003051604A1 PCT/EP2002/014153 EP0214153W WO03051604A1 WO 2003051604 A1 WO2003051604 A1 WO 2003051604A1 EP 0214153 W EP0214153 W EP 0214153W WO 03051604 A1 WO03051604 A1 WO 03051604A1
Authority
WO
WIPO (PCT)
Prior art keywords
crc
wear protection
nicr
zro
return valve
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.)
Ceased
Application number
PCT/EP2002/014153
Other languages
German (de)
English (en)
Inventor
Paul-Eberhard Kortmann
Bernhard PÖLTL
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.)
Mannesmann Plastics Machinery GmbH
Original Assignee
Mannesmann Plastics Machinery GmbH
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 Mannesmann Plastics Machinery GmbH filed Critical Mannesmann Plastics Machinery GmbH
Publication of WO2003051604A1 publication Critical patent/WO2003051604A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/47—Means for plasticising or homogenising the moulding material or forcing it into the mould using screws
    • B29C45/50—Axially movable screw
    • B29C45/52—Non-return devices
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C26/00—Coating not provided for in groups C23C2/00 - C23C24/00
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/47—Means for plasticising or homogenising the moulding material or forcing it into the mould using screws
    • B29C45/50—Axially movable screw
    • B29C45/52—Non-return devices
    • B29C2045/526—Abrasion resistant means in the screw head or non-return device

Definitions

  • the invention relates to a non-return valve according to the preamble of patent claim 1 and a method for its production according to the preamble of the independent patent claim 9.
  • screws In the injection molding of thermoplastic materials, screws are used that can be axially displaced in plasticizing cylinders and rotated in a defined direction.
  • the plastic granulate is melted by the friction occurring here and by additional heating strips placed on the outside of the plasticizing cylinder.
  • the screw is used as a piston to inject the plastic compound into the cavity of a mold and is moved axially in the plasticizing cylinder.
  • non-return valves are used.
  • Non-return valves are known from the prior art (WO 00/23248), which have a locking sleeve or a locking ring at the front end of the screw. During injection, this locking ring is pressed against a pressure ring surface of a base body arranged at the head of the screw. When dosing, i.e. when the rotating screw returns, the locking ring is lifted off the pressure and stop surface and pressed against the stop surfaces by wings or the like arranged on the head of the base body.
  • the locking ring is freely movable with respect to the screw and does not rotate at all or only at a low speed when dispensing due to the friction on the wall of the plasticizing cylinder. This results in a rubbing process between the locking ring and the contact surfaces of the wings.
  • the abutting surfaces are provided with wear protection layers.
  • a method for producing a coating on the surface of a non-return valve in which a metallic, hard metal or ceramic edge layer is produced by means of laser beam remelting.
  • a disadvantage of the laser beam remelting process is that the process is expensive and lengthy.
  • DE 3943 344 C1 it is known to provide a plasticizing screw with a wear protection layer by winding a winding tape consisting of a wear-resistant metallic material onto the top of the web of the screw webs and fixing it there.
  • the invention is based on the object of specifying a non-return valve which has a long service life and of specifying a method for its production which enables a rapid production process to be carried out at low cost.
  • the main advantage of the non-return valve according to the invention is that the friction pairings can be optimally coordinated with one another by using different wear protection layers. In this way, the friction pairings can be optimally coordinated with one another by using different wear protection layers. In this way, the friction pairings can be optimally coordinated with one another by using different wear protection layers. In this way, the friction pairings can be optimally coordinated with one another by using different wear protection layers. In this way, the friction pairings can be optimally coordinated with one another by using different wear protection layers. In this way, the
  • Wear protection coating can be optimally adapted to the respective wear. This advantage can also be achieved by varying the chemical composition of the belt and thus taking into account the different types of wear.
  • a tape containing a coating material is applied to the areas of the non-return valve that are subject to increased wear, different tapes are used for different surface areas. It proves to be a great advantage that the respective tape can be cut in the simplest manner to the appropriate shape of the surface to be coated.
  • the strip sections are then thermally treated, so that a wear-protected surface is created in said areas, the surfaces corresponding to one another having different wear protection layers.
  • the belts can be applied and thermally treated at any processing stage of the non-return valve of the plasticizing, mixing or conveying screw, provided that only the surfaces on which the belt sections are applied have already been machined during machining. Another advantage is that the belts can also be used to repair a non-return valve that is already in use.
  • the band is applied and tempered on an annular sealing and / or friction surface of the screw tip and / or of the pressure ring and / or of the locking ring directed in the conveying direction and / or counter to the conveying direction of the plasticizing unit. These axially directed surfaces meet during the operation of the non-return valve.
  • the end face of the screw tip directed against the conveying direction meets a surface of the locking ring pointing in the conveying direction.
  • An end face of the locking ring directed against the conveying direction meets an end face of the pressure ring directed in the conveying direction.
  • the surfaces hit each other and rub against each other. These surfaces are therefore subject to high wear during operation of the non-return valve.
  • a wear protection coating according to the method of the invention therefore proves to be particularly advantageous here.
  • the band sections are advantageously applied to at least one end face of a pressure ring and / or locking ring.
  • all the surfaces that meet, the annular sealing or friction surface of the screw tip, both end surfaces of the locking ring and the end surface of the pressure ring pointing in the conveying direction are armored with a wear protection layer.
  • the tapes are preferably glued onto the non-return valve. This is the easiest and cheapest way of fastening.
  • the strips are fixed on the non-return valve by a ceramic support device or a wire mesh, so that it cannot slip during the subsequent thermal treatment.
  • the glue is not required in this variant. This does not cause problems with the adhesive's combustion residues during the heat treatment of the tape.
  • the thermal treatment is preferably a soldering process or a sintering process.
  • the belt is firmly bonded to the non-return valve without it being distorted by excessive thermal stress.
  • This thermal treatment preferably takes place in a vacuum oven. This avoids oxidation processes on atmospheric oxygen.
  • the thermal treatment takes place by means of an induction coil.
  • the thermal treatment by means of the induction coil is preferably carried out with a blanket of inert gas.
  • the thermal treatment is carried out using a flame. This is a very inexpensive variant.
  • a tape containing a coating material is applied to a worn area of the non-return valve after its mechanical pretreatment for repair purposes.
  • the strip is then thermally treated, so that a wear-protected surface is created in said area.
  • the surface is preferably machined.
  • a non-return valve 9 has a base body 1, which consists of a head part 2 tapering towards the front, a cylindrical shaft part 3 and an end piece 4. On the head part 2 wings 6 are provided, on the end faces 7 of the locking ring 10 in the open position of the non-return valve. At the front end of the end piece 4, a pressure ring 5 is provided, while the rear end of the end piece 4 has a thread (not shown here) in order to be able to fasten the non-return valve in the plasticizing screw.
  • the locking ring 10 is freely movable in a certain area on the base body 1 between the end faces 7 of the wings 6 as a stop surface and a stop surface 8 of the pressure ring 5. Between the inner wall of the locking ring 10 and the shaft part 3, an annular gap 12 is formed, through which the plastic melt can flow into the antechamber in the open position of the non-return valve.
  • the axially directed surfaces meet one another during operation of the non-return valve 9.
  • the locking ring 10 rests with its rear stop surface 14 close to the stop surface 8 of the pressure ring 5, while in the open position the locking ring 10 with its front stop surface 15 bears against the stop surfaces 7 of the wing 6.
  • the end faces 6 of the vanes 7 directed counter to the conveying direction 11 meet the front stop face 15 of the locking ring 10 pointing in the conveying direction 11.
  • the rear stop face 14 of the locking ring 10 directed counter to the conveying direction 11 meets an end stop facing in the conveying direction 11 End face 8 of the pressure ring 5.
  • a first band A containing a coating material is applied to the friction surfaces 7 of the vanes 6, which are directed against the conveying direction 11 of the plasticizing unit. Furthermore, a second, different band B is applied to the front stop surface 15 and a third band C to the rear stop surface 16 in the locking ring 10. In addition, a fourth band D is applied to the end face 8 of the pressure ring 5 pointing in the conveying direction 11. To do this, tapes A, B, C and D are cut to the appropriate shape beforehand. The inside of the tapes are provided with an adhesive and therefore adhere independently to the previously mentioned surfaces to be coated. Bands A - D are optimized depending on the type of wear that occurs.
  • these strips are sintered onto the areas of the wings 6, the locking ring 10 and the pressure ring 5 to be coated in a vacuum furnace, not shown.
  • the adhesive burns on the inside of the tapes.
  • the tapes melt and form an intimate connection with their respective base.
  • the surfaces of the wings 6, the locking ring 10 and the pressure ring 5 which are intimately connected to the band 1 are now armored by different and optimally coordinated wear protection coatings.
  • One or more of the following materials are used as coating materials in the strips: Al, B, Co, Cr, Mo, Nb, Ni, Si, Ti, W, AlO-ZrO, AL-TiO, Co-Cr, Co-Ni, CO- Mo-Cr, CrC-NiCr, CrC-Ni, Cr-Ni, CrO, NiCrAI, NiCrMo, TiC-CrNi, VC-CrNi, WC-CrC-Ni, WC- CrC-NiCr, WC-Co, WC- Co-Cr, WC-Co-NiCr, WC-Ni, WC-VC-Ni, ZrO-AlO, ZrO-MgO.
  • the material to be processed on the plastics machine can be a determining factor.
  • the proportion of hard phases in the strip alloys can vary between 5 and 50% by weight.
  • the friction partners should have a different composition if possible, for example when using alloys with the hard phase WC-Co the proportion in the contact surfaces of the wings is 50% by weight and 30% by weight in the corresponding front stop surface of the locking ring.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Sliding Valves (AREA)

Abstract

L'invention concerne un clapet antiretour (9) comportant un corps de base (1) présentant une partie de tête (2) pourvue d'ailettes (6), et une partie de tige (3) pourvue d'une bague de verrouillage (10) pouvant se déplacer axialement. En position ouverte, la surface d'appui frontale (15) de la bague de verrouillage (10) s'appuie contre la base de la partie de tête (2), et en position fermée, la surface d'appui arrière (14) s'appuie contre une bague d'étanchéité (5). Les surfaces de contact de la bague de verrouillage (10), de la partie de tête (2) et de la bague d'étanchéité (5) sont pourvues d'une couche de protection antiusure. La clapet antiretour selon l'invention est caractérisé en ce que les surfaces de contact (7, 8, 14, 15) présentent différentes couches de protection antiusure (A, B, C, D). Ainsi, le revêtement de protection antiusure peut être adapté idéalement aux contraintes d'usure individuelles. Selon l'invention, différentes bandes (A, B, C, D) contenant respectivement le matériau de revêtement souhaité sont employées. Ces bandes sont fixées sur les surfaces devant être revêtues et soumises à traitement thermique.
PCT/EP2002/014153 2001-12-14 2002-12-12 Clapet antiretour comportant une couche de protection antiusure et procede de fabrication Ceased WO2003051604A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10161362 2001-12-14
DE10161362.8 2001-12-14

Publications (1)

Publication Number Publication Date
WO2003051604A1 true WO2003051604A1 (fr) 2003-06-26

Family

ID=7709138

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2002/014153 Ceased WO2003051604A1 (fr) 2001-12-14 2002-12-12 Clapet antiretour comportant une couche de protection antiusure et procede de fabrication

Country Status (1)

Country Link
WO (1) WO2003051604A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10052099B2 (en) 2006-01-31 2018-08-21 Ethicon Llc Surgical instrument system comprising a firing system including a rotatable shaft and first and second actuation ramps
CN110001015A (zh) * 2019-05-20 2019-07-12 陈国放 一种注塑机的注塑螺杆
CN110091480A (zh) * 2019-05-31 2019-08-06 徐锡东 一种注塑机用螺杆止逆环机构
DE102019127097A1 (de) * 2019-10-09 2021-04-15 Wittmann Battenfeld Gmbh Verfahren zum Herstellen einer Rückstromsperre einer Schnecke einer Plastifizier- und/oder Einspritzeinheit einer Spritzgießmaschine

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2005302A (en) * 1977-10-04 1979-04-19 Rolls Royce Nickel-free cobalt alloy
US5167971A (en) * 1991-07-29 1992-12-01 Gill Joseph R Check valve assembly for injection molding apparatus
JPH05261782A (ja) * 1992-03-18 1993-10-12 Hitachi Metals Ltd プラスチック成形用スクリュ部品およびその組立品
US5424134A (en) * 1991-05-30 1995-06-13 Castolin S.A. Wear-resistant layer on a component and process for the production thereof
EP1029629A2 (fr) * 1999-02-17 2000-08-23 EUROMAT Gesellschaft für Werkstofftechnologie und Transfer mbH Procédé pour la fabrication d'une couche de protection sur la surface de pièces; alliage et matériau de brasage utilisé
US6155816A (en) * 1995-10-04 2000-12-05 Engel Maschinenbau Gesellschaft M.B.H. Return flow shut-off device for an injection unit in an injection moulding machine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2005302A (en) * 1977-10-04 1979-04-19 Rolls Royce Nickel-free cobalt alloy
US5424134A (en) * 1991-05-30 1995-06-13 Castolin S.A. Wear-resistant layer on a component and process for the production thereof
US5167971A (en) * 1991-07-29 1992-12-01 Gill Joseph R Check valve assembly for injection molding apparatus
JPH05261782A (ja) * 1992-03-18 1993-10-12 Hitachi Metals Ltd プラスチック成形用スクリュ部品およびその組立品
US6155816A (en) * 1995-10-04 2000-12-05 Engel Maschinenbau Gesellschaft M.B.H. Return flow shut-off device for an injection unit in an injection moulding machine
EP1029629A2 (fr) * 1999-02-17 2000-08-23 EUROMAT Gesellschaft für Werkstofftechnologie und Transfer mbH Procédé pour la fabrication d'une couche de protection sur la surface de pièces; alliage et matériau de brasage utilisé

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section Ch Week 199345, Derwent World Patents Index; Class A32, AN 1993-356822, XP002235566 *
SCHEY J.A.: "Introduction to manufacturing processes", 1987, MC GRAW-HILL BOOK COMPANY, SINGAPORE, XP002235565 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10052099B2 (en) 2006-01-31 2018-08-21 Ethicon Llc Surgical instrument system comprising a firing system including a rotatable shaft and first and second actuation ramps
CN110001015A (zh) * 2019-05-20 2019-07-12 陈国放 一种注塑机的注塑螺杆
CN110091480A (zh) * 2019-05-31 2019-08-06 徐锡东 一种注塑机用螺杆止逆环机构
DE102019127097A1 (de) * 2019-10-09 2021-04-15 Wittmann Battenfeld Gmbh Verfahren zum Herstellen einer Rückstromsperre einer Schnecke einer Plastifizier- und/oder Einspritzeinheit einer Spritzgießmaschine

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