EP2475480A1 - Injection plunger for die casting, and casting method - Google Patents
Injection plunger for die casting, and casting methodInfo
- Publication number
- EP2475480A1 EP2475480A1 EP10761040A EP10761040A EP2475480A1 EP 2475480 A1 EP2475480 A1 EP 2475480A1 EP 10761040 A EP10761040 A EP 10761040A EP 10761040 A EP10761040 A EP 10761040A EP 2475480 A1 EP2475480 A1 EP 2475480A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- injection
- alloy
- head
- 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.)
- Granted
Links
- 238000002347 injection Methods 0.000 title claims abstract description 73
- 239000007924 injection Substances 0.000 title claims abstract description 73
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000004512 die casting Methods 0.000 title claims abstract description 12
- 238000005266 casting Methods 0.000 title abstract description 5
- 239000000463 material Substances 0.000 claims abstract description 40
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 10
- 239000000956 alloy Substances 0.000 claims abstract description 10
- 238000000465 moulding Methods 0.000 claims description 31
- 229910000753 refractory alloy Inorganic materials 0.000 claims description 30
- 229910000831 Steel Inorganic materials 0.000 claims description 25
- 239000010959 steel Substances 0.000 claims description 25
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 8
- 229910000838 Al alloy Inorganic materials 0.000 claims description 7
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 5
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 4
- 229910052750 molybdenum Inorganic materials 0.000 claims description 4
- 239000011733 molybdenum Substances 0.000 claims description 4
- 229910052759 nickel Inorganic materials 0.000 claims description 4
- 239000011819 refractory material Substances 0.000 claims description 4
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 4
- 239000010937 tungsten Substances 0.000 claims description 4
- 229910052721 tungsten Inorganic materials 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 15
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 6
- 238000007711 solidification Methods 0.000 description 5
- 230000008023 solidification Effects 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 239000008188 pellet Substances 0.000 description 4
- 230000017525 heat dissipation Effects 0.000 description 3
- 238000001746 injection moulding Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000012778 molding material Substances 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229910001297 Zn alloy Inorganic materials 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
-
- 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 heat 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 provides an injection piston for molding under pressure, characterized in that the piston comprises a piston body and a material injection head, at least a portion of the head being in refractory alloy at the Heat with a coefficient of thermal expansion of less than 6 * 1 0 "6 K " 1 and / or a coefficient of thermal conductivity greater than 50 W / mK
- the piston comprises an insert attached to the piston body, the insert forming the injection head of the piston.
- the piston body comprises a hot working steel whose thermal conductivity coefficient of the order of 25W / mK and / or whose coefficient of thermal expansion between 8 0 "6 K “ 1 and 1 0 * 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 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.
- FIG. 1 a die casting machine
- Figure 2 a motor housing obtained by molding using the die casting machine
- FIG. 3 a front view of an injection piston for the die casting of a material
- FIG. 4 a sectional view of the injection piston of FIG. 3;
- Figure 6 an injection piston diagram provided with a ring.
- the invention relates to an injection piston for molding under pressure.
- 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 cavity of the mold 96 shown in 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.
- the 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 refractory heat alloy has a low coefficient of thermal expansion, the high temperatures then lead only limited expansion of the injection piston 10 in the sleeve. 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 40-6 K -1 and 6 * 10 -6 K -1 .
- heat-resistant alloys have a good coefficient of thermal conductivity.
- the coefficient of thermal conductivity of a refractory material may for example be greater than 50 W / mK, preferably between 50 W / mK and 150W / mK
- 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 refractory heat alloy ultimately allows to increase the life of the molding installation and reduce the production costs of molded parts.
- Figure 3 shows a front view of an injection piston 10 for die casting of material.
- the piston injection head 16 is shown intended to come into contact with the material 30 to be injected into the cavity of the mold 96.
- FIG. 4 shows a side view of the injection piston 10 of FIG. 3.
- the piston 10 may further comprise an insert 12.
- the insert 12 is attached to the body of the piston 14.
- the insert can form a part of the head or form the entirety of the piston head 16.
- the insert 12 comprises the refractory alloy to heat. It is also possible to make the insert 12 entirely of heat refractory alloy in accordance with FIG. 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 the it is fixed to the rest of the piston 10.
- the piston body 14 may however comprise a hot working steel.
- the hot work steels can have a coefficient of thermal conductivity of about 25 W / mK "1, a coefficient of thermal expansion greater than 8 * 10" 6K “typically 1 to about 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 refractory alloy to heat for the realization of the piston 10. In fact the alloys refractory to heat can be more expensive to supply than hot work steel. It is preferred that 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 thermal conductivity greater than that of 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.
- 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. Such thermal conductivity allows sufficient heat removal while limiting the use of refractory materials much more efficient and more expensive.
- the refractory alloy may be an alloy based on nickel, 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 ring of copper alloy 18 surrounds the piston body 14 and a portion of the piston injection head 16
- the copper alloy ring 18 has an outside 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 wears more quickly 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 the piston body 14 is disposed.
- the arrangement of the piston body 14 on a tip 20 allows rapid replacement of the used piston body 14 by mass production of moldings 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. L use of a nozzle 20 with a copper ring 18 makes it possible to quickly replace the wear-worn copper ring 18 by simply displacing the piston body 14 with respect to the nozzle 20.
- the invention also relates to a process for 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 process for molding under pressure with such a piston 10 then allows the injection of a one-piece aluminum alloy 80.
- the molding process can also allow the injection of a zinc alloy or one-piece magnesium 80.
- the die casting process allows the production of massive parts, for example in the automotive field, as engine cases.
- 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 pressure molding 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)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0956177A FR2949694B1 (en) | 2009-09-10 | 2009-09-10 | INJECTION PISTON FOR PRESSURE MOLDING AND MOLDING METHOD |
PCT/FR2010/051693 WO2011030025A1 (en) | 2009-09-10 | 2010-08-11 | Injection plunger for die casting, and casting method |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2475480A1 true EP2475480A1 (en) | 2012-07-18 |
EP2475480B1 EP2475480B1 (en) | 2013-05-15 |
Family
ID=41334479
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10761040.4A Active EP2475480B1 (en) | 2009-09-10 | 2010-08-11 | Injection plunger for die casting, and casting method |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2475480B1 (en) |
FR (1) | FR2949694B1 (en) |
WO (1) | WO2011030025A1 (en) |
Families Citing this family (1)
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR956177A (en) | 1950-01-26 | |||
US3532561A (en) * | 1967-05-11 | 1970-10-06 | Gen Electric | Ferrous metal die casting process and products |
FR2631862B1 (en) * | 1988-05-26 | 1990-08-10 | Snpe Ingenierie | DEVICE FOR TRANSFERRING A COOLED PISTON, A METAL COMPOSITION MELTED ON A VERTICAL HIGH PRESSURE MOLDING PRESS |
US6591894B2 (en) * | 2001-06-15 | 2003-07-15 | Brush Wellman, Inc. | Shot blocks for use in die casting |
AU2003220875A1 (en) * | 2003-03-27 | 2004-10-25 | Kubota Corporation | Heat insulation plunger sleeve for die casting machine |
-
2009
- 2009-09-10 FR FR0956177A patent/FR2949694B1/en not_active Expired - Fee Related
-
2010
- 2010-08-11 EP EP10761040.4A patent/EP2475480B1/en active Active
- 2010-08-11 WO PCT/FR2010/051693 patent/WO2011030025A1/en active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2011030025A1 * |
Also Published As
Publication number | Publication date |
---|---|
FR2949694B1 (en) | 2011-08-26 |
WO2011030025A1 (en) | 2011-03-17 |
FR2949694A1 (en) | 2011-03-11 |
EP2475480B1 (en) | 2013-05-15 |
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