EP1563931A1 - Procédé d'assemblage des pièces inorganiques produites par moulage par injection avec des pièces produites par un autre procédé - Google Patents

Procédé d'assemblage des pièces inorganiques produites par moulage par injection avec des pièces produites par un autre procédé Download PDF

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Publication number
EP1563931A1
EP1563931A1 EP05002766A EP05002766A EP1563931A1 EP 1563931 A1 EP1563931 A1 EP 1563931A1 EP 05002766 A EP05002766 A EP 05002766A EP 05002766 A EP05002766 A EP 05002766A EP 1563931 A1 EP1563931 A1 EP 1563931A1
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EP
European Patent Office
Prior art keywords
inorganic
injection molding
shaped body
powder
parts
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.)
Granted
Application number
EP05002766A
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German (de)
English (en)
Other versions
EP1563931B1 (fr
Inventor
Hans Dr. Wohlfromm
Arnd D.I. Thom
Johan D.I. Ter Maat
Martin Blömacher
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BASF SE
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BASF SE
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Priority to PL05002766T priority Critical patent/PL1563931T3/pl
Publication of EP1563931A1 publication Critical patent/EP1563931A1/fr
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Publication of EP1563931B1 publication Critical patent/EP1563931B1/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
    • B22F3/225—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip by injection molding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/10—Sintering only
    • B22F3/1017—Multiple heating or additional steps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
    • B22F7/06—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools
    • B22F7/062—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools involving the connection or repairing of preformed parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy

Definitions

  • the present invention relates to a method for connecting at least one of Powder injection molding compounds produced by injection molding first inorganic shaped body with at least one produced by a method other than injection molding second inorganic molded article and the use of this method.
  • the moldings produced by the known method have over others Among other things, manufacturing processes have the advantages of offering a wide range of bandwidth of available materials that complex geometries are made can be and that tight tolerances without post-processing (accuracy about +/- 0.3%) and good surfaces can be achieved.
  • the object of the present invention is to provide an improved Process for the permanent joining of powder injection molding compounds by injection molding produced inorganic moldings with other methods than Injection molding produced inorganic moldings.
  • first a first inorganic molded article is produced by injection molding Powder injection molding materials produced.
  • the powder injection molding compounds are, for example as injection-moldable granules containing both an inorganic powder (for Example metal powder), as well as a binder.
  • injection molding compound a product from the Catamold® product range of BASF AG, Ludwigshafen, Germany Germany, used.
  • Such injection molding compounds are for example from the DE 197 00 277 A1 or DE 40 21 739 A1.
  • For injection molding of the first inorganic moldings can be standard machines for thermoplastic injection molding be used. If necessary, the injection molding machine to the Material properties of the powder injection molding compound of the first inorganic molding be adapted, for example by special screw geometries or nozzles, by installing a backflow lock or by increasing the wear protection.
  • step b) of the process according to the invention the first inorganic molded body binder removal.
  • Debinding is understood to mean the removal of the binder as far as possible from the first inorganic molded article produced by injection molding (Green compact). The debinding method depends on that in the powder injection molding compound contained binder.
  • binder systems with thermally decomposable binders in particular To grow. These are made by a thermal debinding process (Melt out or decompose via the gas phase) from the first inorganic Molded body removed.
  • Another debinding option is solvent extraction, in which the binder is removed with solvents such as water or acetone.
  • the most common method is catalytic debinding, which allows for short debinding times.
  • the Catamold® powder injection molding compounds from BASF AG contain polyacetal as a binder.
  • polyacetal can be depolymerized in non-molten state in gaseous components and thus remove without residue from the injection molded part. This is made possible by the special chemical structure of the polyacetal.
  • Polyacetal unlike polyethylene, is characterized by recurrent carbon-oxygen bonds. At the oxygen atom of this group, acids can attack and split the macromolecule into the basic building blocks CH 2 O (formaldehyde).
  • the catalyst used is preferably gaseous nitric acid (> 99%).
  • the particular suitability of this chemical reaction for debindering in powder injection molding is to be seen in the conditions under which it takes place.
  • the polymer has a melting temperature of about 165 ° C. Debindering takes place well below the melting point at 110 to 140 ° C.
  • the reaction proceeds in the form of a front from outside to inside through the part to be debinded. In the reaction, the polymer goes directly from the solid to the gas state. The reaction gas can thus easily escape through the already porous shaped body zones. A pressure build-up and the resulting destruction of the molding can be avoided.
  • the resulting monomer has a boiling point of -21 ° C and is thus under degassing conditions in any case gaseous. In principle, a 100% debinding could be achieved in this way.
  • the debindered first inorganic shaped body is called a Braunling.
  • step c) of the process according to the invention is a sintering process with the assembled first and second inorganic moldings performed.
  • the second inorganic molded article is a method other than injection molding produced inorganic shaped body, for example one by press-sintering, Casting, forging, milling or turning manufactured molding.
  • sintering is meant a heat treatment process in which the loose powder framework of the debindered first inorganic shaped body (Braunling) to the finished Component compacted and simultaneously with the second inorganic molded body is connected.
  • a thermally activated material transport takes place, the leads to a decrease in the specific surface area of the inorganic powder particles.
  • the first inorganic shaped body shrinks during sintering in step c) of the invention Process.
  • Shaped body Particle contacts between the particles of the first inorganic shaped body and the second inorganic molded article. It creates a cohesive Composite between the two moldings.
  • the inventive method thus allows the cost-effective connection of inorganic injection molded articles with inorganic non-injection molded articles in large quantities.
  • the first inorganic molded body and the second inorganic molded body can in the present invention before step b) of the method according to the invention or before step c) of the method according to the invention are joined together. If the Moldings are assembled before step b), they go through the together Debinding step b).
  • the process steps b) according to the invention are and c) in two different furnaces (debinding and sintering furnace) or one after the other performed in a single oven.
  • the joining of the moldings before step b) has the advantage that the brittle Braunling (the debinded first molding) not must be moved individually before performing the sintering process and Thus, a possible breakage of the Braunlings is avoided.
  • the inorganic sinterable powder A can be made of any known suitable inorganic sinterable powders are selected. It is preferably made of metal powders, Metal alloy powders, metal carbonyl powders and mixtures thereof.
  • metals which may be in powder form are iron, cobalt, Called nickel and silicon. Alloys are, for example, light metal alloys based on aluminum and titanium as well as alloys of copper or bronze. Hard metals such as tungsten carbide, boron carbide or titanium nitride come in combination with metals such as cobalt and nickel into consideration. Suitable powders are, for example in EP-A 0 465 940, EP-A 0 710 516, DE-A 39 36 869, DE-A 40 00 278 and EP-A 0 114,746 and the literature cited therein.
  • the particle sizes of the powders are preferably from 0.1 to 50 ⁇ m, more preferably 0.2 to 8 ⁇ m.
  • the metal powders, metal alloy powders, metal carbonyl powders can also be used in a mixture.
  • component C dispersing aid can be known from Dispergiertosmitteln be selected.
  • examples are oligomeric polyethylene oxide having an average molecular weight of 200 to 600, stearic acid, stearic acid amide, Hydroxystearic acid, fatty alcohols, fatty alcohol sulfonates and block copolymers of ethylene and propylene oxide, as well as particularly preferred polyisobutylene.
  • Especially Polyisobutylene is preferred in an amount of 1 to 6% by volume, based on the Component A, B and C used.
  • thermoplastic compositions may also contain conventional additives and processing aids, the rheological properties of the mixtures during deformation influence favorably.
  • the at least one second inorganic molding contains at least a material from the group of low-alloy steels, stainless steels, tool steel, soft magnetic alloys, light metals, heavy metals, copper base materials or precious metals.
  • This sintering process is particularly suitable for powder injection molding compounds from the Catamold® product range BASF AG suitable.
  • the sintering process needs be tuned to the respective material to be sintered.
  • the above Temperature program is taken into account that after debindering in Step b) still a small proportion of residual binder in the first inorganic molding located.
  • the maximum to be reached Sintering temperature depends on the material of the first and second inorganic shaped body.
  • the sintering process preferably takes place in inert gas or in a vacuum.
  • the Inert gas atmosphere or the vacuum are necessary to unwanted prevent chemical reactions during sintering.
  • Possible shielding gases are hydrogen, argon or nitrogen or a mixture thereof.
  • the sliding aid serves to shrink the first inorganic shaped body during the sintering process without hindrance and without an undesirable in certain places ensure cohesive connection of the moldings.
  • the slip aid will Therefore, before the sintering step applied to surface portions of the moldings, the touching each other after being joined, but not firmly connected by sintering but on which the first inorganic molding through the shrinkage during sintering slides along.
  • a necessary feature of the slip aid is therefore its sliding action at the maximum sintering temperature (second Holding temperature).
  • Preferred slip aids for the process according to the invention are Boron nitride, molybdenum sulfide or molybdenum disulfide.
  • a polymer film between certain sixteenzusinternde Surfaces prior to performing the sintering process, a polymer film between certain fauxzusinternde Surfaces inserted.
  • the polymer film can have different functions fulfill. You can for a better bond between the first inorganic Shaped body and the second inorganic shaped body, since they have a lower Melting point than the maximum sintering temperature possesses and therefore during the sintering process unfolds an adhesive effect between the moldings. Further can it release carbon, which diffuses into the surfaces of both moldings, the melting temperature is reduced there, and thus sintering closer to the melting temperature allows.
  • the polymer film can be made from any known suitable polymer films to be selected. Preferably, it contains a polymer from the group Polyethylene (PE), polypropylene (PP) or polyvinyl chloride (PVC).
  • the present invention further includes the use of the invention Method for the production of gear parts, gears, jewelery, levers, nozzles, Covers, pump parts, electric motor parts, ball bearings, valves, parts of weapons, sports equipment, Household appliances, medical devices, tools or parts thereof.
  • the use of the method according to the invention is not based on the production limited said workpieces.
  • Figure 1 shows in Figure i a section through two moldings, which with the aid of the invention Process are to be firmly connected.
  • the first inorganic molded body 1 is an annular workpiece shown in FIG i is present as a green compact, so produced by injection molding from a powder injection molding material was, or is present as a brownling, so is already released.
  • the powder injection molding compound For example, was an injection-moldable granules for the production of sintered moldings from a low alloy, case - hardenable steel from Type 8620.
  • the second inorganic molded part is for example a forged part of highly alloyed Stole. It has a cylindrical portion 3 whose radius is smaller than the radius of the first inorganic molding 1 is.
  • the first shaped body 1 is a debonded Braunling, can after joining the two moldings 1, 2 next, the sintering process be performed.
  • a surface 6 of the second molded body is preferably before sintering a polymer film (not shown) which is thus interposed between them Surfaces 6 and 7 of the two moldings 2 and 1, respectively located.
  • Figure iii of Figure 1 shows the connected according to the inventive method Shaped body 1, 2 after performing the sintering process. Shaped body 1 is during sintering onto the cylindrical portion 3 of the second molded body 2 "shrunk” and sintered together with this on the surfaces 6, 7. That so manufactured workpiece 8 is for example a gear part.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Materials Engineering (AREA)
  • Powder Metallurgy (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Producing Shaped Articles From Materials (AREA)
EP05002766A 2004-02-12 2005-02-10 Procédé d'assemblage des pièces inorganiques produites par moulage par injection avec des pièces produites par un autre procédé Active EP1563931B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL05002766T PL1563931T3 (pl) 2004-02-12 2005-02-10 Sposób łączenia nieorganicznych kształtek wytwarzanych z proszkowych mas wtryskowych przez formowanie wtryskowe z nieorganicznymi kształtkami wytwarzanymi innym sposobem

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004006954 2004-02-12
DE102004006954A DE102004006954A1 (de) 2004-02-12 2004-02-12 Verfahren zum Verbinden von anorganischen, aus Pulverspritzgussmassen durch Spritzgießen hergestellten Formkörpern mit nach einem anderen Verfahren als Spritzgießen hergestellten anorganischen Formkörpern

Publications (2)

Publication Number Publication Date
EP1563931A1 true EP1563931A1 (fr) 2005-08-17
EP1563931B1 EP1563931B1 (fr) 2007-04-18

Family

ID=34684026

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05002766A Active EP1563931B1 (fr) 2004-02-12 2005-02-10 Procédé d'assemblage des pièces inorganiques produites par moulage par injection avec des pièces produites par un autre procédé

Country Status (9)

Country Link
US (1) US20050182176A1 (fr)
EP (1) EP1563931B1 (fr)
JP (1) JP2005226160A (fr)
AT (1) ATE359889T1 (fr)
DE (2) DE102004006954A1 (fr)
ES (1) ES2285580T3 (fr)
PL (1) PL1563931T3 (fr)
PT (1) PT1563931E (fr)
SG (1) SG114696A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113860883A (zh) * 2020-06-30 2021-12-31 比亚迪股份有限公司 一种多色陶瓷及其注塑方法

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7583489B2 (en) * 2006-05-22 2009-09-01 Andrew Llc Tungsten shorting stub and method of manufacture
JP2009215881A (ja) * 2006-07-05 2009-09-24 Mitsubishi Electric Corp バルブタイミング調整装置
DE102006060338A1 (de) 2006-12-13 2008-06-19 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Haftfester Metall-Keramik-Verbund und Verfahren zu seiner Herstellung
US8679598B2 (en) * 2010-10-08 2014-03-25 Guardian Industries Corp. Vacuum insulated glass (VIG) unit including nano-composite pillars, and/or methods of making the same
US9162927B2 (en) * 2011-03-16 2015-10-20 Basf Se Process for producing metallic or ceramic shaped bodies
DE102011106950A1 (de) * 2011-07-08 2013-01-10 Wdt-Wolz-Dental-Technik Gmbh Verfahren zur Herstellung eines metallischen Körpers aus mindestens zwei optisch unterschiedlichen Metallen
CN109676141B (zh) * 2017-12-06 2020-10-23 全亿大科技（佛山）有限公司 异形复杂金属制品的制造方法及异形复杂金属制品
JP2022101987A (ja) * 2020-12-25 2022-07-07 セイコーエプソン株式会社 製品の製造方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4681733A (en) * 1984-02-24 1987-07-21 Nitto Electric Industrial Co., Ltd.: Mazda Motor Corporation Process for fixing alloy powder molding at sintering
EP0491950A1 (fr) * 1990-07-12 1992-07-01 Seiko Epson Corporation Procede de production de pieces constitutives de la tete d'impression d'une imprimante par points du type a impact
US20020005085A1 (en) * 1997-07-16 2002-01-17 Macki James M. Method to form dense complex shaped articles
DE10127626A1 (de) * 2001-06-07 2002-12-19 Alliance S A Verfahren zur Herstellung gebauter Werkstücke
EP1464874A1 (fr) * 2003-04-04 2004-10-06 Polymer-Chemie GmbH Procédé de fabrication d'une roue dentée pour engrenage de changement de vitesse

Family Cites Families (4)

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Publication number Priority date Publication date Assignee Title
US5487865A (en) * 1993-04-08 1996-01-30 Corning Incorporated Method of making complex shaped metal bodies
JPH08310878A (ja) * 1995-05-17 1996-11-26 Juki Corp 焼結体と異種材料体との結合方法
US6033788A (en) * 1996-11-15 2000-03-07 Case Western Reserve University Process for joining powder metallurgy objects in the green (or brown) state
US6551551B1 (en) * 2001-11-16 2003-04-22 Caterpillar Inc Sinter bonding using a bonding agent

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4681733A (en) * 1984-02-24 1987-07-21 Nitto Electric Industrial Co., Ltd.: Mazda Motor Corporation Process for fixing alloy powder molding at sintering
EP0491950A1 (fr) * 1990-07-12 1992-07-01 Seiko Epson Corporation Procede de production de pieces constitutives de la tete d'impression d'une imprimante par points du type a impact
US20020005085A1 (en) * 1997-07-16 2002-01-17 Macki James M. Method to form dense complex shaped articles
DE10127626A1 (de) * 2001-06-07 2002-12-19 Alliance S A Verfahren zur Herstellung gebauter Werkstücke
EP1464874A1 (fr) * 2003-04-04 2004-10-06 Polymer-Chemie GmbH Procédé de fabrication d'une roue dentée pour engrenage de changement de vitesse

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113860883A (zh) * 2020-06-30 2021-12-31 比亚迪股份有限公司 一种多色陶瓷及其注塑方法
CN113860883B (zh) * 2020-06-30 2022-12-09 比亚迪股份有限公司 一种多色陶瓷及其注塑方法

Also Published As

Publication number Publication date
JP2005226160A (ja) 2005-08-25
SG114696A1 (en) 2005-09-28
DE502005000591D1 (de) 2007-05-31
PL1563931T3 (pl) 2007-09-28
ATE359889T1 (de) 2007-05-15
DE102004006954A1 (de) 2005-09-01
EP1563931B1 (fr) 2007-04-18
US20050182176A1 (en) 2005-08-18
ES2285580T3 (es) 2007-11-16
PT1563931E (pt) 2007-05-31

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