DE102008034462A1 - Method for casting parts of motor vehicle from metal or metal alloy in a mold using cast-inserted piece remaining in the mold, where the cast-inserted piece comprises a channel for coolant for discharge and supply of heat and/or cold - Google Patents

Abstract

The method for casting parts of motor vehicle from metal or metal alloy in a mold using cast-inserted piece remaining in the mold, is claimed. The cast-inserted piece comprises a channel (5) for coolant for discharge and supply of heat and/or cold during casting and/or cooling. The channel for coolant is removed in the casting insert piece in the production of the casting part. The channel for coolant is arranged and formed in the cast-insert piece so that its removal is carried out in the production of the casting part without additional step. The method for casting parts of motor vehicle from metal or metal alloy in a mold using cast-inserted piece remaining in the mold, is claimed. The cast-inserted piece comprises a channel (5) for coolant for discharge and supply of heat and/or cold during casting and/or cooling. The channel for coolant is removed in the casting insert piece in the production of the casting part. The channel for coolant is arranged and formed in the cast-insert piece so that its removal is carried out in the production of the casting part without additional step. The distance of the channel for coolant arises itself through surface processing in the following processing of the casting part. The channel for coolant is arranged in a material projection (4) that is removed during the production of the casting part. The casting part is a motor block (1) in which cylinder sleeves are cast for cylinder (2). The cast-insert piece is pre-heated into the mold and casting part comprises cast-insert piece, which consists of different channels or different form of channels. An independent claim is included for a cast-insert piece for casting parts of motor vehicle.

Description

The Invention relates to a method for casting parts, in particular parts of motor vehicles, of metals or metal alloys in a mold, remaining in the casting Cast inserts are used.

It is known to influence the later Properties of a casting may be useful, the casting to cool immediately after the introduction of the liquid metal, to specifically influence the thermal progression during cooling.

So it is from the US 2003/0217831 A1 and the US 7,017,648 B2 known to use actively cooled moldings for the casting of engine or cylinder blocks.

In Both patents will be a "form body" with high specific heat density (or here cold) and Conductivity in a sand casting package in the area of the crankshaft bearing of an attached cylinder block brought in. The casting medium solidifies in this area, due to the high and rapid heat absorption of the molding, faster than the rest of the area, resulting in locally different ones Set material properties. The shaped body is after taken from the casting and the destruction of the sandpacket, cooled and can then be reused.

hereby However, the moldings are used even more expensive and more complex.

Farther It is known when casting cast inserts to use, which remain in the finished casting and possibly subsequently edited, such. B. cylinder liners at an engine block. These are mainly used to in light metal castings higher strength component, eg. B. cylinder liners, pour.

In In production, it has proven to be advantageous to use these cylinder liners, also called "liner", in pre-heated condition to introduce into the mold. This will be the full Filling of the bridge area with casting material positive influenced or it is the cold run in the contact zone diminished, d. H. a quench-solidification of the melt as it approaches at the cold liner and as a result a loss of liner contact, which would be fatal for the heat transfer. On the other hand, a preheated liner has a clear higher amount of heat, which has a negative impact on the Cooling behavior, especially in the web area effect.

From this there is a conflict of goals between the hotest possible Bridge area when filling the form and possible cold bridge area immediately after the mold filling.

this Problems is dedicated to the invention and provides a solution at least minimizes or bypasses the problems.

By the method set forth in claim 1, wherein a Gußeinsatzstück at least one channel for coolant to off and / or Supply of heat or cold during casting and / or cooling, it is not possible only targeted to influence the material properties locally, but also the formation of voids in certain areas, the otherwise caused by cooling shrinkage, to prevent and to prevent a risk of cracking by reducing internal stresses. Consequently can the thermal history problematic casting areas when cooling even more targeted or directly influenced become.

there For example, a casting may have one or more casting inserts exhibit. Furthermore, the Gußeinsatzstücke each have different numbers of channels, either one or more, which also formed differently can be, both within a Gußeinsatzstückes itself as well as the shape of the channels of the various cast inserts can be different. Under form is understood here the geometric design the channels, ie diameter, cross-sectional shape, cross-sectional shape, Curvature etc. This allows targeted in certain zones of the casting, the cooling is controlled even more precisely become.

Already during casting and / or after casting Coolant targeted through the cooling channels led to a rapid heat removal and thus faster solidification in the area of the cooling channels comes. The remaining area of the casting remains uncooled and solidifies accordingly slower. If that entire casting or workpiece is solidified is the mold is opened and the newly created workpiece is taken.

Especially it is preferred within the scope of the invention if the channels for coolant in the cast inserts removed during the subsequent processing of the casting become. The channels for coolant in the Gußeinsatzstücken are therefore preferably arranged and trained that their removal in the subsequent processing of the casting without additional steps can be done. This can be z. B. in the subsequent processing of the casting by an anyway necessary surface treatment result. So can the channels for coolant are arranged in material projections, in the following Processing of the casting to be removed.

For example can the coolant channels in inside directed, longitudinally extending material protrusions be formed of cylinders. After completion of the corresponding Engine blocks need the inner surfaces of the cylinders machined, wherein the material protrusions Easy to be removed, so that the desired Surface yields.

essential Thought of the invention is therefore the arrangement of coolant channels in separate material protrusions arranged and are formed that after their removal an already desired Course of the workpiece or its surface results.

The Invention may preferably be used in the die casting process come. However, an application in the sand casting process is also conceivable.

The Gußeinsatzstücke can due to the invention Design now preheated inserted into the mold become. It has proven to be good in production, the cast inserts (eg liners) in pre-heated State in the mold to bring. This will be the full filling the web area positively influenced by casting material or it is the cold running reduced in the contact zone.

The The invention also relates to corresponding cast inserts for use in casting parts, in particular of parts of motor vehicles, of metals or metal alloys in a mold, wherein the Gußeinsatzstück remains in the casting, characterized in that the Casting insert at least one channel for Coolant for the removal and / or supply of heat or cold during casting and / or cooling having.

Especially it is preferably a cylinder for an engine block. The cast inserts are cylinder liners, preferably made of cast steel or gray cast iron, and the engine block is made of light metal, preferably an aluminum or magnesium alloy.

Further Details, features and advantages of the invention will become apparent the following description of an embodiment based on the drawing in which the

figure a schematic cross section through an engine block after the Pour and show after editing.

In the figure is a schematic cross section through two cylinders 2 and 2 ' an engine block 1 shown. In the engine block 1 made of light metal are the cylinder liners 3 and 3 ' for the cylinders 2 and 2 ' cast. The cylinder shows 2 or the cylinder liner 3 the processing stage after casting, and the cylinder 2 ' the processing stage after a machining of the cylinder liner 3 ' ,

The cylinder liner 3 has a material projection 4 in which a coolant channel 5 is introduced, extending in the longitudinal direction of the cylinder liner 3 extends. Thus, the bridge can 6 between adjacent cylinders 2 and 2 ' be cooled specifically.

During casting, the cylinder liners become 3 . 3 ' on a not shown positioning in the mold for the engine block 1 positioned. Then the mold is closed and the casting takes place, wherein all suitable casting methods can be used, for. B: Die-casting or sand casting.

Already during casting and / or after cooling liquid is targeted through the cooling channels 5 directed, so that it to a controlled and / or rapid heat removal and thus faster solidification in the area of the web 6 comes.

The rest of the area remains uncooled and solidifies accordingly slower. When the entire workpiece is solidified, the mold is opened, the newly created workpiece is removed, new cylinder liners 3 are inserted and a new pouring process can be started.

Subsequently, the cylinder 2 reworked as usual and known, z. B. milling or cutting. This is the material advantage 4 that the cooling channel 5 includes, removed, the cylinder thus obtained 2 ' has a circular inner circumference. Preferably, the processing is carried out in the same step as the already necessary processing of the inner surface of the cylinder 2 ' , Then is for the removal of the material projection 4 and the cooling channel 5 no additional processing step required.

1

block

2

cylinder

3

Cylinder liner

4

material advantage

5

Coolant channel

6

web

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• US 2003/0217831 A1 [0003]
• US 7017648 B2 [0003]

Claims (14)

Method for casting parts, in particular parts of motor vehicles, of metals or metal alloys in a casting mold, in which at least one casting insert piece remaining in the casting ( 3 ), characterized in that the cast insert ( 3 ) at least one channel ( 5 Has for coolant for removal and / or supply of heat or cold during casting and / or cooling. Method according to claim 1, characterized in that the channel ( 5 ) for coolant in the casting insert ( 3 ) in the subsequent processing of the casting ( 1 ) Will get removed. Method according to claim 1 or 2, characterized in that the channel ( 5 ) for coolant in the casting insert ( 3 ) is arranged and designed so that its removal in the subsequent processing of the casting ( 1 ) can be done without additional work step. A method according to claim 3, characterized in that in the subsequent processing of the casting ( 1 ) the distance of the channel ( 5 ) for coolant results from an anyway necessary surface treatment. Method according to claim 3 or 4, characterized in that the channel ( 5 ) for coolant in a material projection ( 4 ) is arranged in the subsequent processing of the casting ( 1 ) Will get removed. Method according to one of the preceding claims, characterized in that the casting is an engine block ( 1 ), in which one or more cylinder liners ( 3 ) for the cylinders ( 2 ) are poured with. Method according to one of the preceding claims, characterized in that it is a die-casting or sand casting. Method according to one of the preceding claims, characterized in that the cast inserts ( 3 ) are used preheated in the mold. Method according to one of the preceding claims, characterized in that a casting several Gußeinsatzstücke having. Method according to claim 9, characterized in that that the cast inserts a different Number of channels. Method according to claim 9 or 10, characterized that cast insert different forms of Have channels. Casting insert for use in the casting of parts, in particular parts of motor vehicles, of metals or metal alloys in a mold, in which the casting insert ( 3 ) remains in the casting, characterized in that the Gußeinsatzstück ( 3 ) at least one channel ( 5 Has for coolant for removal and / or supply of heat or cold during casting and / or cooling. Casting insert according to claim 12, characterized in that at least two channels are present, which are formed differently. Casting insert according to claim 12 or 13, characterized in that it is a cylinder liner ( 3 ) for an engine block ( 1 ).