DE19727566A1 - Process for die casting a machine housing, in particular for internal combustion engines - Google Patents

Description

According to the preamble of claim 1, the invention relates to Process for die casting a machine housing, in particular for a burner engines, which is a chamber formed by means of a hollow insert having.

DE 29 04 167 C describes a cylinder head which can be produced by die casting known for a water-cooled internal combustion engine, in which transverse channels and a Longitudinal channel are formed by cast, interconnected pipes. Furthermore, the individual tubes of this insert serving as a core replacement separate openings in the cylinder head towards the machine-side parting plane molded water spaces, with the insert over which the water Spaces forming projections of the die with positive engagement in the respective openings of the tubes of the insert is positioned.

The invention is based, for a method for die casting a machine housing with an insert for this positioning to show that the smallest possible number subsequently in the casting closing openings.  

This object is achieved with claim 1, the insert in the Die casting mold positioned on a substantially overhung mandrel is arranged.

With the positioning according to the invention is easy or relatively short building insert in the casting only to subsequently close an opening, whereas with an elongated insert or / and a heavy insert part of the flying mandrel in its free end section with a a die casting cooperating support pin is supported and thus for in this case a second opening has to be closed later.

In an advantageous development of the method, the insert along its Er stretching over its inner contour with an essentially appropriate fit thorn fixed. This configuration is in addition to that in a simple manner achieved position fixation the further advantage associated with that at a relatively thin wall insert the pressure occurring during die casting from the mandrel will catch. A simple example of this is a cylindrical tube as an insert partially referenced that over its entire extent from that point on fitted mandrel is filled. Because here the thorn over the entire extent the tubular insert is cylindrical and does not require tapering, there is no high thermal load on the mandrel in its tapered end Area.

In a further embodiment of the method according to the invention, dung disadvantageous material accumulations in the machine housing suggested that the chamber formed by the insert via a hollow fort formed on the insert sets is increased in volume.

Best suited for the given machine housing designs fit chamber is in a further embodiment of the method according to the invention thereby achieved that the insert with projections formed with high internal pressure has, and for perfect positioning in an end area with the Mandrel has a form-fitting interacting fixing profile. This fixing profile can  featured in the end area of the insert or outside the machine housing to be seen.

According to a further proposal according to the invention, this becomes easy insert formed in a metal alloy into a light metal machine housing poured, the insert with its extensions in a cylinder crank serves to reduce the accumulation of material, especially in the cylinder the area of the machine housing near the socket.

For a machine manufactured by the die casting process according to the invention Finally, it is proposed that the insert be placed in a Crankcase outside and adjacent to the interface to the cylinder head orderly extension forms a resource channel, which if necessary with Cylinder head directed connecting lines is formed.

An equipment channel with a connection located on the outside of the housing cables to the cylinder head arranged above is per se z. B. from the FR 2225628 A known.

The method according to the invention is based on two differently shaped Inserts described for the machine housing shown in the drawing. It shows

Fig. 1, a cylinder-crankcase with innenhochdruckverformtem insert,

Fig. 2 shows the deformed insert as a resource channel in section along the line II-II, and

Fig. 3 shows a tubular insert.

A chamber 3 , 3 'is formed in each case in a machine housing 1 , 1 ' produced by the die casting process by means of an insert part 2 , 2 '. For the positioning of the respective insert 2 , 2 'in the respective die-casting mold, a method is to be shown which leaves the lowest possible number of openings to be subsequently closed in the respective machine housing 1 , 1 '.

For this purpose, the method according to the invention provides that the insert 2 , 2 'is positioned in the die-casting mold (not shown) on a mandrel 4 which is arranged essentially in a flying manner.

This mandrel 4 can be arranged with a short insert 2 , 2 'and / or light weight single sided in the die casting mold, with a long insert 2 , 2 ' and / or large weight the mandrel 4 can have a securing pin 5 at its free end , which engages in a slide of the die.

In a according to Fig. 3 designed in the form of a tube 6 the insertion part 2 is this' along its extension (not shown) on its inner contour on a mandrel adapted accordingly positioned. The mandrel, not shown, completely fills the tube 6 and thus serves, in particular in the case of a thin-walled insert 2 ', to withstand the casting pressure.

In the further developed according to FIG. 1, the chamber 3 formed by the insert 2 is enlarged via hollow extensions 7 formed on the tubular insert 2 . This increase in volume of the insert 2 is preferably achieved in that the insert 2 has projections 7 formed with internal high pressure. For the position-securing positioning of this insert 2 , it has in one end region a fixing profile 8 which interacts positively with the mandrel 4 , for. B. a square.

In a preferred application of the method according to the invention, the insert part 2 , 2 'formed from a light metal alloy is poured into a light metal machine housing 1 , 1 ', the insert part 2 with its extensions 7 in a cylinder crankcase 9 to advantageously reduce a Material accumulation is used.

In one manufactured in the die casting machine housing 1, 1 'with a method according positioned insert part 2, 2', this adjacent in the outside of the cylinder crankcase 9, and an interface 10 to a not shown cylinder head disposed extension 11 forms an operating fluid channel 12 connected to the cylinder head Directional connecting lines 13 is formed.

Claims (6)

1. Method for die casting a machine housing, in particular for internal combustion engines

• having a chamber ( 3 , 3 ') formed by means of a hollow insert ( 2 , 2 '), characterized in that
• - That the insert ( 2 , 2 ') is positioned in the die-casting mold on an essentially flying mandrel ( 4 ).

2. The method according to claim 1, characterized in that the insert ( 2 ', tube 6 ) is fixed in position along its extent over its inner contour with a substantially correspondingly adapted mandrel. 3. The method according to claim 1 and 2, characterized in that the chamber is volumenvergrößert formed by the insert (2) (3) molded on the insert part (2) hollow projections (7). 4. The method according to claim 3, characterized in

• - That the insert ( 2 ) with molded internal projections ( 7 ), and
• - In an end region with the mandrel ( 4 ) positively co-operating fixing profile ( 8 ).

5. The method according to claims 1 to 4, characterized in

• - That the insert formed from a light metal alloy ( 2 , 2 ') is poured into a light metal machine housing ( 1 , 1 '), where at
• - The insert ( 2 ) with its extensions ( 7 ) in a cylinder cure bel housing ( 9 ) serves to reduce material accumulation.

6. The die casting process according to claims 1 to 5 manufactured machine housing, characterized in that

• - That the insert ( 2 , 2 ') in an on the cylinder crankcase ( 9 ) on the outside and a separating surface ( 10 ) adjacent to the cylinder head extension ( 11 ) forms an operating medium channel ( 12 )
• - If necessary with connecting lines directed to the cylinder head ( 13 ) is formed.