EP2475480B1 - Spritzenkolben für druckguss und gussverfahren - Google Patents

Spritzenkolben für druckguss und gussverfahren Download PDF

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Publication number
EP2475480B1
EP2475480B1 EP10761040.4A EP10761040A EP2475480B1 EP 2475480 B1 EP2475480 B1 EP 2475480B1 EP 10761040 A EP10761040 A EP 10761040A EP 2475480 B1 EP2475480 B1 EP 2475480B1
Authority
EP
European Patent Office
Prior art keywords
piston
injection
plunger
alloy
steel
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.)
Active
Application number
EP10761040.4A
Other languages
English (en)
French (fr)
Other versions
EP2475480A1 (de
Inventor
Frédéric ZEDDA
Cédric VERON
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.)
PSA Automobiles SA
Original Assignee
Peugeot Citroen Automobiles SA
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Filing date
Publication date
Application filed by Peugeot Citroen Automobiles SA filed Critical Peugeot Citroen Automobiles SA
Publication of EP2475480A1 publication Critical patent/EP2475480A1/de
Application granted granted Critical
Publication of EP2475480B1 publication Critical patent/EP2475480B1/de
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/2015—Means for forcing the molten metal into the die
    • B22D17/2038—Heating, cooling or lubricating the injection unit

Definitions

  • the present invention relates to an injection piston for the die casting of a material.
  • the invention further relates to a method of molding a material under pressure with the injection piston.
  • a piston When molding a material under pressure, a piston is used to introduce the material of an injection bushing into the cavity of a mold. The piston is then in contact with the piston head with the material in the liquid state and at an elevated temperature. The piston is also subject to high temperature variations and friction in the material injection bushing. The life of such a piston is then limited by these constraints and generates significant costs, including the frequent shutdown of mass production of die cast parts for the replacement of the injection piston.
  • the document FR-A-2,631,862 proposes an injection piston for molding coated with a thermal shield, with a low coefficient of thermal conductivity, on the front wall of the piston.
  • the purpose of the document is then to provide a seal between the piston and the wall of the injection chamber while avoiding the possibility of excessive cooling of the front portion of the piston. This solution does not appear entirely satisfactory and does not allow a short molding cycle time.
  • the invention proposes an injection piston for molding under pressure, characterized in that the piston comprises a piston body and a material injection head, at least a part of the head being made of refractory alloy with the heat with a coefficient of thermal expansion of less than 6 * 10 -6 K -1 and / or a coefficient of thermal conductivity greater than 50 W / mK
  • the piston comprises an insert fixed to the body of the piston, the insert forming the injection head of the piston.
  • the piston body comprises a hot working steel whose thermal conductivity coefficient is of the order of 25 W / mK and / or whose coefficient of thermal expansion between 8 * 10 -6 K -1 and 10 * 10 -6 K -1 .
  • the refractory alloy has a thermal expansion less than that of steel, preferably five times lower than that of steel, and a thermal conductivity greater than that of steel, preferably from three to five times. times greater than that of steel.
  • the refractory alloy is a nickel-based alloy, tungsten or molybdenum.
  • the piston further comprises a copper alloy ring around the piston body.
  • the invention also relates to a pressure molding process of a material characterized in that the injection of the material is carried out using the injection piston as defined above.
  • the injected material is an aluminum alloy, the injection then preferably being carried out at a temperature of between 650 ° C. and 680 ° C.
  • the invention relates to an injection piston for die casting.
  • This piston comprises a piston body and a metal alloy injection head. At least a part of the head is made of heat-refractory alloy.
  • the material for molding is in a socket before its introduction into the mold cavity 96 shown figure 1 .
  • the mold cavity 96 consists of a moving part 92 and a fixed part. The mobility of this part 92 makes it possible to extract the part after solidification and the mass production of molded parts.
  • an injection piston 10 placed in contact with the material 30 is used to introduce it into the cavity of the mold 96.
  • the piston 10 then moves inside the injection bushing to inject the material in the mold cavity 96.
  • the injection sleeve is in a fixed part 94 of the machine 90.
  • the molding material 30 in the injection sleeve is liquid, thus above its melting point, when the material 30 is in contact with the injection piston 10.
  • the temperatures of the material before molding can be important, for example in the case of an aluminum alloy the temperature can be 650 ° C to 680 ° C in contact with the piston injection head.
  • the rate of mass production of molded parts imposes a rapid cooling of the material 30 just after the injection resulting in rapid and large variations in the temperature of the material 30.
  • piston 10 particularly the piston injection head, are subjected to high temperatures and large temperature variations.
  • the refractory alloy has a good mechanical strength at high temperature, for example temperatures between 600 ° C and 700 ° C.
  • the use of such a piston 10 then reduces the loss of mechanical strength of the piston 10 due to these high temperatures and large temperature variations.
  • the heat refractory alloy has a low coefficient of thermal expansion, the high temperatures then cause only limited expansion of the injection piston 10 in the socket. Indeed the piston injection head, as well as the rest of the piston 10, tend to deform depending on the coefficient of thermal expansion of the material component of the piston 10.
  • the piston 10 and / or the injection head of piston can then no longer be perfectly cylindrical.
  • the limitation of the expansion of the piston 10 is advantageous in that it makes it possible to reduce the friction between the piston 10 and the bushing during the injection of material for molding. Indeed such friction can cause localized wear on the piston 10.
  • the reduction of the friction of the piston 10 then avoids premature failure of the piston 10 and ensures a longer life of the piston 10 as well as the entire molding machine 90. This longer lifetime also reduces the production costs of molded parts using such a piston 10.
  • the coefficient of thermal expansion of a refractory material may for example be less than 6 * 10 -6 K -1 , preferably between 4 * 10 -6 K -1 and 6 * 10 -6 K -1 .
  • heat resistant alloys have a good coefficient of thermal conductivity.
  • the use of an injection piston 10 comprising a refractory alloy then causes rapid cooling of the injected material.
  • the material remaining in the sleeve in contact with the piston 10, the pellet 40 shown figure 2 then solidifies faster.
  • the reduction of the solidification time makes it possible to save time on the production of the molded piece 80, ie a reduction in the cycle time of the mass production.
  • a rapid cooling of the pellet 40 also makes it possible to reduce the number of splashes of the primary casting channel containing the material 42 and which connects the socket to the mold cavity 96. Thus, if the primary casting channel remains too hot, this can cause many production stops.
  • the coefficient of thermal conductivity of a refractory material may, for example, be greater than 50 W / m ⁇ K, preferably between 50 W / m ⁇ K and 150 W / m ⁇ K.
  • the refractory alloy has a good mechanical strength at high temperature, for example temperatures between 600 ° C and 700 ° C.
  • the breaking strength of the refractory alloy can then be of the order of 500 to 600 MPa.
  • the use of such a refractory alloy makes it possible to maintain the mechanical strength of the piston 10 while improving the thermal conductivity and decreasing the thermal expansion.
  • the piston comprising a heat refractory alloy ultimately makes it possible to increase the service life of the molding installation and to reduce the production costs of molded parts.
  • FIG 3 shows a front view of an injection piston 10 for die casting of material.
  • the piston injection head 16 intended to come into contact with the material 30 to be injected into the cavity of the mold 96.
  • figure 4 shows a side view of the injection piston 10 of the figure 3 .
  • the piston 10 may further comprise an insert 12.
  • the insert 12 is fixed to the body of the piston 14.
  • the insert may form part of the head or form the entirety of the piston head 16.
  • the insert 12 has the refractory alloy to heat. It is also possible to make the insert 12 entirely of heat-refractory alloy in accordance with the figure 5 .
  • the addition to the piston 10 of the refractory alloy can then be done simply and economically by the production of an insert 12 which is fixed to the rest of the piston 10.
  • the piston body 14 may however comprise a hot working steel.
  • Hot working steels may have a coefficient of thermal conductivity of the order of 25 W / mK -1 , a coefficient of thermal expansion greater than 8 * 10 -6 K -1, typically of the order of 9 * 10 - 6 K -1 .
  • the realization of a piston body 14 made of hot-working steel makes it possible to limit the consumption of heat-refractory alloy for the production of the piston 10. Heat-resistant alloys can be more expensive to supply than heat-resistant alloys. hot working steel.
  • the refractory alloy has a thermal expansion less than that of steel.
  • the coefficient of thermal expansion of the refractory alloy is then lower than that of the hot working steel.
  • the deformation of the piston 10, or of the piston injection head 16 is therefore limited with respect to the deformation of the piston body 14 made of hot working steel with a coefficient of thermal expansion greater than that of the refractory alloy. .
  • the piston injection head 14 has dimensions very close to that of the sleeve to prevent the infiltration of material to be injected between the piston 10 and the sleeve. Slight variations in the dimensions of the piston injection head by expansion then lead to friction of the piston injection head 16 against the injection bushing.
  • the limitation of the expansion of the piston 10 is therefore particularly useful at the level of the piston injection head 16.
  • the limitation only of the deformation of the piston head 16 makes it possible to avoid the friction of the piston injection head 16 with the injection bushing while limiting the manufacturing costs of the steel piston body 14, which is a more common material.
  • the shape of the end of the piston head 16 can also be made thinner to limit the mechanical forces due to thickness variations. Indeed the piston head 16 expands under the effect of high temperatures. Significant variations in the thickness of the piston head 16 may lead to the appearance of mechanical forces at the level of thickness variations. It can then be provided that the inner face 22 of the piston head 16 is hollowed to refine the shape of the end of the piston head 16, that is to say to limit the variation of the refractory alloy thickness.
  • the thermal expansion of the refractory alloy is five times lower than that of steel. This ratio between the thermal expansion of the refractory alloy and that of the steel of the piston body 14 makes it possible to limit the production costs of the piston 10 with the refractory alloy while ensuring sufficient thermal expansion.
  • the refractory alloy has a higher thermal conductivity than steel.
  • the piston portion 10 of refractory alloy then allows a better heat dissipation as the piston body 14. This better heat dissipation, including the heat of the material remaining in the injection bushing after injection of the material into the mold cavity, allows faster solidification of this material 30 in a pellet 40. This better heat dissipation also allows a faster solidification of the material remaining in the casting channel 42.
  • the piston body 14 is not directly in contact with the molding material, and it plays a secondary role in the evacuation of heat. The rest of the steel piston body 14 is then made for reasons of economy, the refractory alloy being more expensive than steel.
  • the refractory alloy has a thermal conductivity three to five times greater than that of steel.
  • thermal conductivity allows sufficient heat removal while limiting the use of refractory materials much more efficient and more expensive.
  • the refractory alloy may be a nickel-based alloy, tungsten or molybdenum.
  • the tungsten and molybdenum based alloys thus have a low thermal expansion and excellent thermal conductivity.
  • Nickel base alloys have average thermal expansion and average thermal conductivity.
  • the piston 10 may comprise a copper alloy ring 18.
  • This copper alloy ring 18 surrounds the piston body 14 and a part of the piston injection head 16.
  • the copper alloy ring 18 has an outer diameter greater than the outside diameter of the piston head 14.
  • the copper ring 18 makes it possible to produce the facing surface of the injection bushing containing the piston 10.
  • the copper ring 18 is then the part of the piston 10 which is wear the most rapidly by friction during the molding process.
  • the realization of the part of the piston 10 that wears most frictionally in a separate part of the rest of the piston 10 allows the replacement of the ring 18 independently of the rest of the piston which can thus have a longer life.
  • the piston 10 may comprise a tip 20 on which is disposed the piston body 14.
  • the arrangement of the piston body 14 on a tip 20 allows rapid replacement of the used piston body 14 by mass production of molded parts 80.
  • the tip 20 may be made of hot working steel.
  • the piston 10 may then comprise a copper ring 18 in addition to the nozzle 20.
  • the copper ring 18 has an outer diameter greater than that of the piston head 16 and that of the nozzle 20.
  • the invention also relates to a method of molding a material 30 under pressure. This molding process is then carried out using the injection piston 10 previously described. The molding process allows a reduction of the solidification times of the pellet 40 and stop times for the piston 10 to be changed. The molding process using the piston 10 for the injection of a material 30 results in a productivity gain of molding of parts 80.
  • the method of molding under pressure with such a piston 10 then makes it possible to inject a one-piece aluminum alloy 80.
  • the molding process can also allow the injection of a zinc or magnesium alloy into one. room 80.
  • the die-casting process makes it possible to produce solid pieces, for example in the automotive field, such as motor housings.
  • the use of this die-casting process for molding aluminum alloy is then particularly useful in the automotive field which uses aluminum alloys for their light weight and mechanical strength.
  • the die casting process using the injection piston 10 allows the molding of material at elevated temperatures.
  • aluminum alloys can have a relatively high injection molding temperature, for example between 650 ° C and 680 ° C.
  • the pressure molding process with the piston 10 then allows the injection at these temperatures while ensuring a good life of the injection piston 10 and thus a good productivity of the molding process.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Claims (10)

  1. Spritzenkolben für Druckguss, dadurch gekennzeichnet, dass der Kolben (10) einen Kolbenkörper (14) und einen Einspritzkopf (16) für Werkstoff aufweist, wobei mindestens ein Teil des Kopfs (16) aus hitzebeständiger Legierung besteht, deren Wärmedehnungkoeffizient niedriger ist als 6*10-6K-1 und/oder deren Wärmeleitungskoeffizient größer ist als 50 W/m.K.
  2. Spritzenkolben nach Anspruch 1, dadurch gekennzeichnet, dass der Kolben (10) einen Einsatz (12) aufweist, der an dem Kolbenkörper (14) befestigt ist, wobei der Einsatz (12) den Einspritzkopf (16) des Kolbens (10) bildet.
  3. Spritzenkolben nach einem der Ansprüche 1 bis 2, dadurch gekennzeichnet, dass der Kolbenkörper (14) einen warm gearbeiteten Stahl aufweist, dessen Wärmeleitungskoeffizient in der Größenordnung von 25 W/m.K liegt und/oder dessen Wärmedehnungkoeffizient zwischen 8*10-6K-1 und 10*10-6K-1 liegt.
  4. Spritzenkolben nach Anspruch 3, dadurch gekennzeichnet, dass die hitzebeständige Legierung eine Wärmedehnung hat, die kleiner ist als die des Stahls, und eine Wärmeleitfähigkeit, die größer ist als die des Stahls.
  5. Spritzenkolben nach einem der Ansprüche 3 bis 4, dadurch gekennzeichnet, dass die hitzebeständige Legierung eine Wärmedehnung hat, die fünf Mal kleiner ist als die des Stahls.
  6. Spritzenkolben nach einem der Ansprüche 4 bis 5, dadurch gekennzeichnet, dass die hitzebeständige Legierung eine Wärmeleitfähigkeit hat, die 3 bis 5 Mal größer ist als die des Stahls.
  7. Spritzenkolben nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass der hitzebeständige Werkstoff eine Legierung auf der Basis von Nickel, Wolfram und Molybdän ist.
  8. Spritzenkolben nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass der Kolben (10) ferner einen Ring (18) aus Kupferlegierung um den Kolbenkörper (14) aufweist.
  9. Verfahren zum Formen unter Druck eines Werkstoffs, dadurch gekennzeichnet, dass das Einspritzen des Werkstoffs mit Hilfe des Spritzenkolbens (10) nach einem der Ansprüche 1 bis 8 erfolgt.
  10. Verfahren zum Formen nach Anspruch 9, dadurch gekennzeichnet, dass der eingespritzte Werkstoff eine Aluminiumlegierung ist.
EP10761040.4A 2009-09-10 2010-08-11 Spritzenkolben für druckguss und gussverfahren Active EP2475480B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0956177A FR2949694B1 (fr) 2009-09-10 2009-09-10 Piston d'injection pour le moulage sous pression et procede de moulage
PCT/FR2010/051693 WO2011030025A1 (fr) 2009-09-10 2010-08-11 Piston d'injection pour le moulage sous pression et procede de moulage

Publications (2)

Publication Number Publication Date
EP2475480A1 EP2475480A1 (de) 2012-07-18
EP2475480B1 true EP2475480B1 (de) 2013-05-15

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP10761040.4A Active EP2475480B1 (de) 2009-09-10 2010-08-11 Spritzenkolben für druckguss und gussverfahren

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EP (1) EP2475480B1 (de)
FR (1) FR2949694B1 (de)
WO (1) WO2011030025A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SG2013087283A (en) 2013-11-25 2015-06-29 Pratt & Whitney Services Pte Ltd Replaceable piston ring for die casting machine plunger

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR956177A (de) 1950-01-26
US3532561A (en) * 1967-05-11 1970-10-06 Gen Electric Ferrous metal die casting process and products
FR2631862B1 (fr) * 1988-05-26 1990-08-10 Snpe Ingenierie Dispositif de transfert a piston refroidi, d'une composition metallique en fusion sur une presse verticale de moulage a forte pression
US6591894B2 (en) * 2001-06-15 2003-07-15 Brush Wellman, Inc. Shot blocks for use in die casting
JPWO2004087351A1 (ja) * 2003-03-27 2006-06-29 株式会社クボタ ダイカストマシン用断熱プランジャースリーブ

Also Published As

Publication number Publication date
FR2949694B1 (fr) 2011-08-26
EP2475480A1 (de) 2012-07-18
FR2949694A1 (fr) 2011-03-11
WO2011030025A1 (fr) 2011-03-17

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