EP3705203A1 - Procédé de fabrication d'une armature en métal coulé et armature correspondante - Google Patents

Procédé de fabrication d'une armature en métal coulé et armature correspondante Download PDF

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Publication number
EP3705203A1
EP3705203A1 EP20158034.7A EP20158034A EP3705203A1 EP 3705203 A1 EP3705203 A1 EP 3705203A1 EP 20158034 A EP20158034 A EP 20158034A EP 3705203 A1 EP3705203 A1 EP 3705203A1
Authority
EP
European Patent Office
Prior art keywords
fitting
cast metal
casting
fittings
inner pipe
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.)
Withdrawn
Application number
EP20158034.7A
Other languages
German (de)
English (en)
Inventor
Andreas Rueegg
Alex Fehlmann
Manuel Keel
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.)
KWC Group AG
Original Assignee
Franke Water Systems AG
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 Franke Water Systems AG filed Critical Franke Water Systems AG
Publication of EP3705203A1 publication Critical patent/EP3705203A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/0045—Casting in, on, or around objects which form part of the product household utensils
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/0072—Casting in, on, or around objects which form part of the product for making objects with integrated channels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D31/00—Cutting-off surplus material, e.g. gates; Cleaning and working on castings
    • B22D31/002—Cleaning, working on castings
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03C—DOMESTIC PLUMBING INSTALLATIONS FOR FRESH WATER OR WASTE WATER; SINKS
    • E03C1/00—Domestic plumbing installations for fresh water or waste water; Sinks
    • E03C1/02—Plumbing installations for fresh water
    • E03C1/04—Water-basin installations specially adapted to wash-basins or baths
    • E03C1/0404—Constructional or functional features of the spout

Definitions

  • the present invention relates to a method for manufacturing a fitting from a cast metal, preferably brass or bronze casting or a zinc die-cast alloy, according to the preamble of claim 1, in which at least one inner pipe is shaped like a waterway of the future fitting, with fittings at its ends is provided and placed with the fittings in a mold, and in which the mold is then poured around the inner tube with the cast metal.
  • the invention also relates to a fitting made of cast metal according to the preamble of claim 11.
  • Such a method is known, for example, from US 2003/062088 A1 .
  • the inner tube is provided with end pieces.
  • a sand core is formed around the inner pipe.
  • the inner tube is placed in a mold and the fitting body is cast.
  • the inner tube can also protrude beyond the area of the casting mold to be poured.
  • the supernatant is then removed and a receptacle for a mouthpiece is incorporated into the front area of the valve outlet.
  • the receptacle must be worked up to the end piece embedded in the casting material so that this forms a sealing surface for the mouthpiece. In this way it can be prevented that escaping water comes into contact with the cast metal of the fitting body.
  • the method therefore requires a comparatively high level of manufacturing accuracy in order to ensure that the subsequently attached receiving opening extends as far as the cast-in end piece that is not visible from the outside, thus preventing water contact with the cast metal.
  • the present invention has set itself the task of specifying an improved method for producing a fitting made of cast metal, which is technically simple and easy to control and thus has a low reject rate, and which enables a thin-walled and filigree fitting design for fittings produced by the casting process.
  • the invention provides that the molded pieces protrude beyond the area of the casting mold to be poured and are connected to the inner pipe in a watertight manner before or during the casting, that after the casting of the fitting, the protrusion of the molded pieces is removed and attached to at least one of the At the ends of the fitting, a receiving opening for a mouthpiece to be inserted is created by machining, the material of the molded piece being removed down to the surrounding cast material in the region of the receiving opening.
  • the advantage of the present invention is, on the one hand, that by using the inner tube embedded in the cast metal, delicate and complex, especially thin-walled fittings can be produced in the casting process, which is not possible with conventional processes that work with a sand core to be removed after casting was.
  • the method according to the invention enables a significantly higher manufacturing accuracy.
  • the molded pieces that protrude beyond the area of the casting mold to be poured contribute to this Allow inner tube in the mold without the risk of this being displaced or removed when the hot casting material is filled.
  • fittings can be made from a cast metal that is easier to process, but not necessarily suitable for drinking water, in particular cast metal with a higher lead content, without the risk of the drinking water being contaminated with heavy metals.
  • the shaped pieces which in turn can be prefabricated as cast, milled or turned parts, are made from a metal suitable for drinking water, in particular a low-lead copper alloy (brass, bronze) or chrome steel.
  • the fitting can also be manufactured from a zinc alloy (zamak) using a die-casting process.
  • the molded pieces have an anti-twist device within the area of the casting mold to be poured, in that they have a shape deviating from a circular cross-section, in particular in that the molded pieces are each provided with one or more millings or shoulders.
  • a molded part with a polygonal cross section is also possible.
  • a sealing seat for sealing against the mouthpiece to be inserted is created in the molding remaining in the cast metal above the region of the receiving opening.
  • the mouthpiece is screwed with a corresponding seal directly against the sealing seat on the part of the fitting remaining in the cast fitting and sealed against it.
  • the sealing seat is thus created directly when the receiving opening is made, for example by drilling or milling. It is thus ensured that the inside of the sealing seat, that is to say in the area of the waterway, is completely in the material of the shaped piece in question.
  • the molded pieces have one or more constrictions within the region of the casting mold to be poured.
  • a constriction that is to say a reduction in the diameter over a certain axial area of the shaped piece in question, can have several functions at the same time.
  • the constriction because it lies within the cast metal, creates a form-fitting connection between the cast metal and the fitting and thus an additional safeguard in the axial direction against loosening of the fittings within the cast metal during subsequent mechanical processing.
  • the wall thickness of the cast metal is increased in the area of the constriction. This prevents cracks from developing in the cast metal, especially at the end of the valve outlet.
  • the watertight connection between the inner pipe and fittings is produced by a soldered, welded or press connection.
  • the inner tube is thus connected in a watertight manner to the fittings before it is inserted into the casting mold. This connection is retained after casting, so that a watertight connection from end-to-end of the fitting is ensured.
  • the watertight connection between the inner pipe and fittings can also be made by inserting the inner pipe together with a solder into a hole in the respective fitting and melting the solder into a soldered joint as a result of the heat generated during casting. This so-called in-situ soldering, using the heat generated during casting, saves one process step.
  • the at least one inner tube consists of a metal suitable for drinking water with a higher melting point than the surrounding cast material, in particular made of copper or stainless steel. In this way, deformation or melting of the surface of the inner tube during casting due to the development of heat is avoided.
  • a plurality of essentially parallel inner pipes are arranged between the two fittings.
  • smaller pipe diameters can be used for the several inner pipes, with which a particularly flat outlet can be designed.
  • At least one of the fittings preferably both fittings, each have a vent hole through which in the inner tube overpressure arising during casting can escape.
  • bores for the later waterways are already introduced in the fittings, which at the same time serve as ventilation bores.
  • the shaped pieces are provided with a receptacle for a positioning aid in the area of their protrusion.
  • a corresponding positioning aid can be a mandrel provided in the casting mold, which is inserted into the receiving opening provided on the molded piece and holds it in the correct position during casting. This measure increases the manufacturing accuracy during the casting process, since the molded pieces and the inner tube connected to them cannot slip within the casting mold.
  • a fitting according to the invention made of a cast metal, preferably made of cast brass or bronze or a zinc die-cast alloy, with at least one inner pipe defining the shape of a waterway through the fitting, which is provided with shaped pieces at its ends, the inner pipe and shaped pieces being surrounded by the cast metal and the fittings are connected to the inner pipe in a watertight manner, and in which the fittings are each in a water-conducting connection to the inner pipe via a bore
  • the fittings have an anti-twist device by having a shape deviating from a circular cross-section, in particular in that the fittings are each provided with one or more milled cuts or shoulders.
  • the fitting preferably has a receiving opening at at least one of its ends for a mouthpiece to be inserted, the material of the molded piece being removed down to the surrounding cast metal in the region of the receiving opening, preferably with a part of the molded piece remaining in the cast metal above the receiving opening
  • Sealing seat is designed to seal against the mouthpiece to be used.
  • At least one of the shaped pieces has one or more constrictions. This ensures a positive connection between the molded part and the cast metal in the axial direction.
  • the at least one inner tube is preferably made of a metal suitable for drinking water with a higher melting point than the surrounding cast metal, in particular made of copper or stainless steel.
  • a plurality of essentially parallel inner tubes are arranged between the two shaped pieces.
  • the fitting 1 shown has a fitting body 2 which, in a transitional area 3 bent at right angles, merges into an approximately horizontally extending, flat outlet area 4.
  • the connection-side molded piece 6 and the mouth-side molded piece 7 are fluid-tightly connected to the inner pipe 5 and define a waterway through the fitting 1.
  • a recess 8 is milled into the fitting body 2, into which an internal thread is cut.
  • a connecting piece with a corresponding external thread is screwed into the receptacle 8 and is used to mount the fitting on a vanity or the like.
  • connection hoses connection hoses
  • connection nipples connection hoses
  • connection openings with internal threads are incorporated into which the connection nipples are screwed to connect the supply lines (hot / cold).
  • a receiving opening 9 is also worked into the lower area of the outlet 4, in which a mouth piece such as a jet regulator is inserted.
  • the fitting 1 is produced from a cast metal such as brass using the metal casting process.
  • the inner tube 5 and the fittings 6, 7 are embedded or cast in the cast metal.
  • the receiving openings 8 and 9 are incorporated into the cast blank by subsequent mechanical processing using a machining process such as milling or drilling.
  • the inner tube 5 consists of a metal with a higher melting point than the cast metal, here copper.
  • the fittings 6, 7 consist of a lead-free or lead-reduced and therefore drinking water-compatible brass alloy.
  • an inner tube 5 is shown with fittings 6, 7 connected to it at the end.
  • the inner tube 5 is bent in the shape of the waterway of the future fitting and soldered to the fittings 6, 7.
  • other methods for the watertight connection of the parts could also be used, such as welding or pressing (crimping, crimping), and are included within the scope of the present invention.
  • the shaped pieces 6, 7 each have extensions 61, 71 projecting beyond the future fitting. These are each provided with a receiving bore 63, 73 which serve as positioning aids in a casting mold for the fitting.
  • the molded piece 6 has a constriction 62 in the area of its upper third. This serves to anchor the molded piece 6 in the surrounding casting material during casting of the fitting and to connect it to it in a form-fitting manner.
  • the shaped piece 7 also has a constriction 72, which, however, extends over a significantly larger axial area. This constriction 72 exposes a larger area, which is filled with cast metal when the fitting is poured and thereby ensures an increased material thickness of cast metal in the mouth area of the fitting.
  • the upper area of the molded piece 7 is also anchored in a form-fitting manner in the surrounding casting material.
  • a milled recess 74 can be seen in the upper area on the right-hand side of the molded piece 7. This serves as an anti-twist device by also leading to a positive connection between the molded piece 7 and the surrounding casting material.
  • FIG. 3a to c the fitting 6 on the connection side is made of Figure 2 shown in more detail.
  • a continuous longitudinal bore 65 which serves on the one hand as a waterway and on the other hand as a ventilation bore.
  • the hole 63 serving as a positioning aid is shown transversely to this.
  • the upper area of the fitting 6 tapers conically and in this area forms a receiving bore 66 for the inner tube 5.
  • a milled recess 64 which serves as an anti-twist device for positive anchoring of the fitting 6 in the surrounding casting material.
  • the Figures 4a to c the mouth-side molded piece 7.
  • This also has a longitudinal bore 75 serving as a waterway and the bore 73 arranged transversely thereto in the protruding area 71 of the molded piece 7, which serves as a positioning aid when inserted into a casting mold.
  • the milling 74 is shown, which in turn acts as an anti-twist device.
  • a connection bore 76 is arranged in the radial direction, which has a connection to the longitudinal bore 75 and is used to connect the inner tube 5.
  • the neck region formed by the constriction 72 is located in the later mouth region of the fitting 1, in which the receiving opening 9 is milled for inserting a mouth piece such as a jet regulator.
  • a (semi) tool in the form of a casting mold 10 is shown.
  • the casting mold 10 has an area 11 to be filled with cast metal, in which the inner tube 5 with the connected fittings 6, 7 is inserted and fixed by means of corresponding positioning aids in the form of cams that engage in the receiving openings 63, 73.
  • the casting mold 10 is then closed with a corresponding upper part and liquid cast metal, here brass, is filled in via a filling opening 12. As soon as the cast metal emerges to the overflow openings 13, the casting mold is filled and the cast blank can be removed after cooling.
  • Figure 6 shows the casting mold 10 in a side view. This is the lower part. A corresponding upper mold half is not shown. The molded pieces 6, 7 with the inner tube 5 located between them are inserted into the casting mold 10 and half of them protrude from the casting mold 10.
  • the blank is processed by removing protrusions from the shaped pieces 6, 7 and casting approaches and grinding the blank. Then a receiving opening 8, 9 is milled from both sides of the valve, i.e. in the base area of the valve body 2 and in the mouth area of the outlet 4, and a thread is cut into this, into which a jet regulator and a connection piece is screwed in the base area.
  • the receiving opening 8, 9 is milled in, the material of the molded pieces 6, 7 and the surrounding casting material are removed.
  • This also creates a sealing seat on the part of the fittings that remains in the fitting 6, 7.
  • the mouthpiece or the connection hose can then be screwed in a sealing manner against these sealing seats by means of a corresponding seal.
  • the sealing surfaces adjoining the waterway of the fitting 1 are therefore located completely within the fittings 6, 7, so that there is no contact with the surrounding cast metal. A material with a higher lead content can thus be used as the cast metal, which as a result has better casting properties.
  • Another advantage is that no sand core is required when casting the fitting.
  • the thicker base area 2 of the fitting 1 shown in the figures is largely filled with the molded piece 6 so that a sand core can be dispensed with at this point.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Domestic Plumbing Installations (AREA)
EP20158034.7A 2019-03-07 2020-02-18 Procédé de fabrication d'une armature en métal coulé et armature correspondante Withdrawn EP3705203A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102019105889.9A DE102019105889A1 (de) 2019-03-07 2019-03-07 Verfahren zum Herstellen einer Armatur aus Gussmetall sowie entsprechende Armatur

Publications (1)

Publication Number Publication Date
EP3705203A1 true EP3705203A1 (fr) 2020-09-09

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EP20158034.7A Withdrawn EP3705203A1 (fr) 2019-03-07 2020-02-18 Procédé de fabrication d'une armature en métal coulé et armature correspondante

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EP (1) EP3705203A1 (fr)
DE (1) DE102019105889A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5579823A (en) * 1994-04-11 1996-12-03 Moen Incorporated Method of casting a permanent core plumbing product
WO1997027417A1 (fr) * 1996-01-24 1997-07-31 Hage Fittings Gmbh & Co. Kg Raccord de tuyaux
US20030062088A1 (en) 2001-10-02 2003-04-03 Frank Perla Water delivery device and method of forming same
US20130174932A1 (en) 2010-03-01 2013-07-11 Globe Union Industrial Corp. Outlet Pipe Structure of a Faucet

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009002057A1 (de) * 2009-03-31 2010-10-07 Zf Friedrichshafen Ag Gussteil und Verfahren zur Herstellung des Gussteiles
WO2013167210A1 (fr) * 2012-05-10 2013-11-14 HDO Druckguss- und Oberflächentechnik GmbH Élément moulé sous pression et procédé de production d'un élément moulé sous pression
US9573191B2 (en) * 2013-05-17 2017-02-21 Moen Incorporated Fluid dispensing apparatus and method of manufacture
DE102014000412B4 (de) * 2014-01-17 2018-01-11 Grohe Ag Verfahren und Armaturengehäuse zur Herstellung einer Sanitärarmatur

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5579823A (en) * 1994-04-11 1996-12-03 Moen Incorporated Method of casting a permanent core plumbing product
WO1997027417A1 (fr) * 1996-01-24 1997-07-31 Hage Fittings Gmbh & Co. Kg Raccord de tuyaux
US20030062088A1 (en) 2001-10-02 2003-04-03 Frank Perla Water delivery device and method of forming same
US20130174932A1 (en) 2010-03-01 2013-07-11 Globe Union Industrial Corp. Outlet Pipe Structure of a Faucet

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