EP3470148B1 - Vorrichtung zur herstellung von gussteilen aus metall - Google Patents

Vorrichtung zur herstellung von gussteilen aus metall Download PDF

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Publication number
EP3470148B1
EP3470148B1 EP18178939.7A EP18178939A EP3470148B1 EP 3470148 B1 EP3470148 B1 EP 3470148B1 EP 18178939 A EP18178939 A EP 18178939A EP 3470148 B1 EP3470148 B1 EP 3470148B1
Authority
EP
European Patent Office
Prior art keywords
channel
sleeve
section
venting
casting cavity
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
EP18178939.7A
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German (de)
English (en)
French (fr)
Other versions
EP3470148A1 (de
Inventor
Achim Tenbusch
Kai- Uwe Ekrutt
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.)
Raskopf Sauerlander Werkzeugfabrik GmbH
Original Assignee
Raskopf Sauerlander Werkzeugfabrik 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 Raskopf Sauerlander Werkzeugfabrik GmbH filed Critical Raskopf Sauerlander Werkzeugfabrik GmbH
Priority to PL18178939T priority Critical patent/PL3470148T3/pl
Publication of EP3470148A1 publication Critical patent/EP3470148A1/de
Application granted granted Critical
Publication of EP3470148B1 publication Critical patent/EP3470148B1/de
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Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/06—Permanent moulds for shaped castings
    • B22C9/067—Venting means for moulds

Definitions

  • the invention relates to a device for the production of cast parts made of metal or light metal alloys by gravity, tilting or low pressure casting with several mold segments that form mold shells and surround a casting cavity in a sealed manner in a casting position, the mold shell, the areas located locally high above the casting cavity which form air-collecting areas, has venting means at least in one of the high-lying areas, the or each venting means consisting of a channel opening into the air-collecting area and penetrating the wall of the mold shell, the venting insert having at least one coolant channel closed to the casting cavity, which on its outside the end opening out of the mold shell can be connected or connected to a coolant transport device, and a continuous ventilation channel which connects the casting cavity with the ambient atmosphere.
  • the air collection area is formed by a large-volume slot on the upper side of the mold part molds, to which a venting means is attached on the outside.
  • the venting means consists of a large-volume body, which on the outside has a two-part body made of poorly thermally conductive material, which on the inside surrounds a two-part body made of good thermally conductive material, this highly conductive body having a ventilation slot with various corrugations between its sub-bodies.
  • air slots are arranged between the venting means and the casting molds, which are intended to hinder or avoid the heat transfer.
  • an arrangement of cooling channels is provided in the poorly thermally conductive outer components of the venting means, which lead to a free space between the highly thermally conductive body and the outer poorly thermally conductive body in order to be able to additionally cool the highly thermally conductive body.
  • the invention is based on the object of creating a device of the generic type in which disruptive accumulations of air in the casting cavity are avoided, and blockage of ventilation elements can also be largely excluded.
  • the invention proposes that the ventilation insert made of a material that conducts heat well is inserted and fixed with a sleeve made of a material that is poorly heat conductive and surrounding the ventilation insert.
  • a through-channel is created in the area in which air can accumulate, that is to say in an area located locally high above the casting cavity, for example by using a drill.
  • This channel then serves to accommodate the ventilation insert together with the sleeve surrounding it.
  • the air mass located in the critical area can flow out through the ventilation channel of the ventilation insert.
  • the preferably provided coolant channel causes the ventilation insert to be cooled, so that the casting material flowing out into the ventilation channel solidifies.
  • a cast fin made of solidified material is thus created.
  • a clogging of the ventilation channel is avoided hereby because the cast fin, which is still formed in one piece with the casting body, is removed from the ventilation channel during demolding. After the casting has been removed from the mold, the casting mold is immediately available again for a new casting process in which the mold segments are closed again and liquid material is again poured into the casting cavity in the casting position.
  • the sleeve is made of poorly heat-conducting material. This means that the heat transfer from the casting material can essentially only take place at the end of the vent insert. This heat is dissipated via the coolant so that the corresponding cast fin is generated without the surface of the cast body to be generated being significantly thermally impaired.
  • the ventilation insert is made of metal, preferably steel.
  • the sleeve consists of ceramic material.
  • the sleeve extends over the entire length of the channel and is preferably flush with the channel at the end opening towards the casting cavity.
  • the sleeve has a collar at its end facing away from the casting cavity, which collar rests against the wall of the mold shell next to the channel.
  • vent insert with its end region facing the casting cavity ends flush with the sleeve and flush with the channel.
  • coolant channel is designed to surround the ventilation channel over its entire length.
  • the coolant duct can be designed in the manner of a helix, so that it surrounds the ventilation duct over its entire length in a helical manner and thus heat can be dissipated to a corresponding extent.
  • the ventilation insert In order to promote the formation of the solidification zone in the ventilation channel of the ventilation insert and to reduce it to the smallest possible zone, provision is also made for the ventilation insert to have a considerably smaller cross-section in its area surrounded by the sleeve than in the one across the sleeve in the direction of the wall the mold shell directed away projecting end region. In addition, it is provided here that the area with the smaller cross section is approximately half as large in diameter as the area with the larger cross section.
  • the ventilation duct has a diameter of 2 mm ⁇ 0.5 mm in a first area, which extends from the end opening to the casting cavity to just above the end of the sleeve, and in the further area up to the area facing away from the casting cavity End has a larger diameter of up to 4 mm.
  • venting channel extends conically widened at its end region opening into the casting cavity, preferably merging from an oval mouth or slot-shaped mouth into the circular cross section, the conical end region over about a third to over half the length of a first region , which extends from its end opening into the casting cavity to over the end of the sleeve.
  • the ventilation channel merges from an oval, elliptical or slot-shaped mouth contour into the smaller bore diameter of the ventilation channel, promotes the solidification process in the direction of the smaller semi-axis of the slot, the oval configuration of the bore or the elliptical configuration of the bore, so that inside the channel the melt is pinched off and further flow of the melt is prevented.
  • the ventilation insert has an assembly collar which, in the desired assembly position, rests against a collar of the sleeve and overlaps it, the assembly collar being fastened to the mold shell with fasteners.
  • FIGs 1 and 2 a device for producing cast parts made of metal, in particular light metal alloys, is shown schematically, which has two mold segments 1, 2 which form mold shells. In a casting position that is in Figure 2 As is illustrated, these mold segments 1, 2 surround a casting cavity 3, which has a region 4 which is located locally high above the casting cavity 3 and which forms an air-collecting region. In this air collection area a venting means, generally designated 5, is provided. For the arrangement of the venting means 5, a channel 6 penetrating the mold segment 2 is formed, which penetrates the mold shell 2 and opens into the collecting area 4.
  • a ventilation insert 7 is inserted tightly, which reaches through the corresponding channel 6 with a partial area and on the front side extends to the collecting area 4, the other end protruding significantly beyond the mold segment 2.
  • the ventilation insert 7 is tightly surrounded by a sleeve 8 made of poorly heat-conducting material, which is also inserted tightly into the channel 6.
  • the ventilation insert 7 at least one coolant channel 9 which is closed towards the casting cavity 3 and which can be or is connected to a coolant transport device at its ends 10, 11 opening out on the outside of the mold shell.
  • the coolant can be fed into the coolant channel at 10, the coolant then being able to be withdrawn again at 11 after passing through the coolant channel.
  • the ventilation insert 7 has a continuous ventilation channel 12, which connects the casting cavity 3 with the ambient atmosphere.
  • the ventilation insert 7 is preferably made of steel, while the sleeve 8 is made of ceramic material with poor thermal conductivity.
  • the length of the sleeve 8 is such that in the assembly position it extends over the entire length of the channel 6 and is flush with the channel 6 at the end opening towards the casting cavity 3.
  • the sleeve 8 has a collar 13 which, in the desired position, rests against the wall of the mold segment 2 next to the channel 6.
  • vent insert 7 closes with its end region facing the casting cavity 3 flush with the sleeve 8 and flush with the channel 6, as in FIG Figure 2 is made clear.
  • the coolant channel 9 is, as in the Figures 5.6 , 9.10 illustrated, designed so that it surrounds the ventilation channel 12 over its entire length, preferably in the manner of a helix.
  • the helix shape is in Figure 7 shown only as an example. It should clarify the shape and the course of the coolant channel 9.
  • the coolant can for example be supplied at 10 and withdrawn again at 11.
  • the ventilation insert 7 has a considerably smaller cross-section (diameter) in its area surrounded by the sleeve 8 than in the one across the sleeve 8 in the direction of the wall of the mold segment 2 facing away protruding end area.
  • the area with a smaller cross section is about half as large in diameter as the area with a larger cross section.
  • the ventilation channel 12 has a diameter of approx. 2 mm ⁇ 0.5 mm in a first area, which extends from the end opening into the casting cavity 3 to just above the end of the sleeve 8, in order to effect adequate air removal, as well as in the further area up to the end facing away from the casting cavity 3 has a larger diameter of for example up to 4 mm.
  • the ventilation channel 12 is widened conically.
  • the conical widening is denoted by 14.
  • the mouth 15 of this area is approximately oval or can also be slot-shaped or elliptical.
  • the conical region 14 extends approximately over a third to half the length of the first region of the Ventilation channel 12, which extends from its end opening into the casting cavity 3 to over the end of the sleeve 8.
  • the ventilation insert 7 has a mounting collar 16 with mounting holes 17. In the intended assembly position, this rests against a collar 13 of the sleeve 8 and overlaps it, as in particular in FIG Figure 2 It can be seen, this assembly collar 16 being fastened to the mold shell 2 with fastening means which engage through the fastening holes 17, for example screws.
  • the ventilation insert 7 has several zones, with the area A forming the solidification zone as the boundary area to the casting contour (cavity 3). Area B with the tightly coiled cooling channel is used for direct heat dissipation from zone A. The somewhat larger coiled area C of the cooling channel is used to dissipate heat in the remaining area of the ventilation insert 7.
  • the assembly of the entire unit is carried out with the following steps.
  • a hole is made (channel 6) into which the sleeve 8 made of poorly thermally conductive material, in particular ceramic, is tightly inserted, which is flush with the contour of the cavity 3.
  • the vent insert 7 is pushed tightly into the sleeve 8 with its end with a smaller diameter until the vent insert with its collar 16 rests on the collar 13 of the sleeve 8.
  • the entire unit is clamped and fastened to the corresponding molded part 2.
  • the function of the ventilation insert 7 during the casting process can be described in the following way.
  • a liquid casting material for example an aluminum alloy.
  • the casting material rises in the casting cavity 3 and displaces the air inside, in particular through the ventilation insert 7. Since the ventilation insert 7 has a sufficiently large air duct 12 of at least 2 mm in diameter, the air can escape very easily there.
  • the air first passes through the solidification zone A and then the further area of the ventilation channel 12. As soon as the air has escaped via the ventilation channel 12, the casting material rises below (at 14) into the area of the solidification zone A.
  • the solidification zone A is geometrically formed as a transition area which merges from an elliptical contour 15 into the smaller bore diameter of the ventilation channel 12.
  • the nozzle-shaped solidification zone at the end has a flow-compatible entry radius and necessary draft angles (preferably between 5 ° and 10 °).
  • the elliptical shape favors the solidification process in the direction of the smaller semiaxis, so that the formation of an insulation channel inside is counteracted and the melt is pinched off.
  • the helically designed cooling channel 9 has an inlet opening 10 and an outlet opening 11 for a cooling medium, for example water or air.
  • the cooling channel 9 is designed as a continuous helix and runs in area B and area C.
  • the descending coil supplies the cooling medium.
  • the ascending spiral leads the cooling medium together with the absorbed heat to the outside again.
  • the ascending branch meets the descending branch of the coil.
  • the sleeve 8 is used as an insulation element. As a result, the heat transport emanating from the casting material can essentially only take place at the end of the ventilation insert 7.
  • the cooling coil removes the heat from the cast material located in the solidification zone A and allows a cast fin to solidify there. If the cast part is now removed from the mold, this cast fin remains as an element protruding beyond the cast contour, which can be removed and leveled by simple reworking.
  • the heat dissipation is controlled, for example with water.
  • the heat dissipation in the ventilation insert 7 takes place on the one hand through the Thermal conduction of the material wall made of material with good thermal conductivity, in particular steel, to the continuous cooling channel 9 and, on the other hand, to the boundary layer of the cooling channels 9 as a result of a convective transition.
  • the heat transfer coefficient ⁇ is a function of several key figures, such as the Nusselt, Prandtl and Reynolds numbers. Since the cooling medium is usually fixed, for example water, and the channel cross-sections of the cooling channel 9 are geometrically predetermined, the heat dissipation is influenced essentially only via the flow speed of the cooling medium and its initial temperature. The temperature of the cooling medium is advantageously left to the ambient temperature, so that the flow rate or the flow rate per time is used to a decisive extent to control the cooling.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
EP18178939.7A 2017-10-10 2018-06-21 Vorrichtung zur herstellung von gussteilen aus metall Active EP3470148B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL18178939T PL3470148T3 (pl) 2017-10-10 2018-06-21 Urządzenie do wytwarzania odlewów z metalu

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102017123470.5A DE102017123470A1 (de) 2017-10-10 2017-10-10 Vorrichtung zur Herstellung von Gussteilen aus Metall

Publications (2)

Publication Number Publication Date
EP3470148A1 EP3470148A1 (de) 2019-04-17
EP3470148B1 true EP3470148B1 (de) 2020-10-07

Family

ID=62748773

Family Applications (1)

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EP18178939.7A Active EP3470148B1 (de) 2017-10-10 2018-06-21 Vorrichtung zur herstellung von gussteilen aus metall

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EP (1) EP3470148B1 (da)
DE (1) DE102017123470A1 (da)
DK (1) DK3470148T3 (da)
PL (1) PL3470148T3 (da)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111230066A (zh) * 2020-03-13 2020-06-05 张军堂 一种防止砂眼的航空用零件压铸模具
CN112496298A (zh) * 2020-10-30 2021-03-16 郝杰 一种快速成型的金属防震动发动机精密配件模具压铸装置

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3006043A (en) * 1959-04-09 1961-10-31 Die Casting Res Foundation Inc Die casting machine and casting process
DE3011098A1 (de) * 1980-03-22 1981-10-01 BEGO Bremer Goldschlägerei Wilh. Herbst GmbH & Co, 2800 Bremen Verfahren und vorrichtung zur herstllung von praezisionsguessen
JPS6360060A (ja) * 1986-08-29 1988-03-16 Takeshi Arai 金型用ガス抜き装置
DE3938086C2 (de) * 1989-11-16 1996-07-11 Rolf Nefzger Entlüftungseinrichtung für formgebende Werkzeuge
JP3025656B2 (ja) * 1997-03-12 2000-03-27 日本碍子株式会社 チルベント
JP3423873B2 (ja) * 1997-11-20 2003-07-07 日本碍子株式会社 チルベント
DE102010007812B4 (de) 2010-02-11 2017-04-20 Ksm Castings Group Gmbh Verfahren und Vorrichtung zur Herstellung von Kraftfahrzeug-Fahrwerksteilen
JP2013166154A (ja) * 2012-02-14 2013-08-29 Japan Mold Trade:Kk ダイキャスト用チルベント
US9272326B2 (en) * 2013-01-16 2016-03-01 Ksm Castings Group Gmbh Apparatus for ventilation of a casting mold

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP3470148A1 (de) 2019-04-17
DK3470148T3 (da) 2021-01-04
PL3470148T3 (pl) 2021-04-19
DE102017123470A1 (de) 2019-04-11

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