U.S. patent application number 10/478789 was filed with the patent office on 2004-09-09 for mold and method for the production of a lost-foam casting model for a light metal cylinder liner.
Invention is credited to Bing, Karlheinz, Winger, Frank.
Application Number | 20040173334 10/478789 |
Document ID | / |
Family ID | 7686186 |
Filed Date | 2004-09-09 |
United States Patent
Application |
20040173334 |
Kind Code |
A1 |
Bing, Karlheinz ; et
al. |
September 9, 2004 |
Mold and method for the production of a lost-foam casting model for
a light metal cylinder liner
Abstract
According to the invention a light metal cylinder liner with a
surface which facilitates the connection with the surrounding cast
material may be produced, whereby the cylinder liner is produced by
means of a lost-foam method with a form for production of the cast
foam model having a structured surface with height variations of
0.8 to 5 mm, said structuring being for example grooves or
longitudinal elevations.
Inventors: |
Bing, Karlheinz; (Remseck,
DE) ; Winger, Frank; (Stuttgart, DE) |
Correspondence
Address: |
WILLIAM COLLARD
COLLARD & ROE, P.C.
1077 NORTHERN BOULEVARD
ROSLYN
NY
11576
US
|
Family ID: |
7686186 |
Appl. No.: |
10/478789 |
Filed: |
April 26, 2004 |
PCT Filed: |
May 21, 2002 |
PCT NO: |
PCT/DE02/01860 |
Current U.S.
Class: |
164/35 ;
164/45 |
Current CPC
Class: |
B22D 19/0009 20130101;
B22D 19/0081 20130101; B22C 7/023 20130101; F02F 7/00 20130101;
F02F 2200/08 20130101 |
Class at
Publication: |
164/035 ;
164/045 |
International
Class: |
B22C 007/02 |
Foreign Application Data
Date |
Code |
Application Number |
May 25, 2001 |
DE |
101 25 615.9 |
Claims
1. Mold for the production of a lost-foam casting model for a light
metal cylinder liner of internal combustion engines, characterized
in that the mold has a structured surface with height variations of
0.8 to 5 mm, at least in partial regions.
2. Mold for the production of a lost-foam casting model according
to claim 1, characterized in that the structured surface is formed
by grooves (1) in the surface of the mold.
3. Mold for the production of a lost-foam casting model according
to claim 1, characterized in that the structured surface is formed
by elevations in the surface of the mold.
4. Mold for the production of a lost-foam casting model according
to claim 1, characterized in that the grooves (1) or elevations run
in the axial direction, in the circumference direction, or in a
diagonal direction, or in wave shape.
5. Method for the production of a lost-foam casting model for a
light metal cylinder liner of internal combustion engines,
characterized in that the surface of the mold in which the
lost-foam casting model is produced has a structured surface with
height variations of 0.8 to 5 mm, at least in segments.
6. Method according to claim 5, characterized in that the surface
is structured by means of grooves (1) or elevations, which run in
the axial direction, in the circumference direction, or in a
diagonal direction, or in wave shape.
Description
[0001] The invention relates to a mold and a method for the
production of a lost-foam casting model for a light metal cylinder
liner of internal combustion engines.
[0002] It is known to cast light metal cylinder liners having an
elevated silicon content in engine blocks, using the composite
casting method. In this connection, it is necessary to produce a
good connection, either as a positive lock or in terms of material,
between the base material having a lower Si content and the
cylinder liner having a higher Si content. A prerequisite for such
locking together of the cylinder liner and the base material is,
among other things, a rough, fissured surface of the cylinder
sleeve that is to be cast into place.
[0003] In order to produce this rough and fissured surface,
different methods have already been proposed: blasting, milling of
depressions, or reshaping of the surface of the cylinder liner by
means of pressure rollers. All of the methods require another
processing step subsequent to the production of the cylinder liner
by means of casting technology.
[0004] It is furthermore known from DE 3909521 to produce cylinder
liners using the lost-foam method. In this connection, the
lost-foam casting model is produced in a multi-part mold.
[0005] It is known from DE 19958185, which is not a prior
publication, to produce a lost mold, more precisely a lost-foam
casting model, having a structured outside surface, in that
particles are applied adhesively to the smooth surface of a lost
mold, which particles produce undercuttings when the light metal
cylinder liner is cast.
[0006] The invention occupies itself with the problem of producing
a light metal cylinder liner having a structured surface, in simple
manner. This problem is solved in that the mold for the production
of the lost-foam casting model of a cylinder liner has a structured
surface with height variations of 0.8 to 5 mm, at least in partial
regions. Advantageous further developments are the object of the
dependent claims.
[0007] In the production of the lost-foam casting model in the mold
according to the invention, a structured outside surface is formed
on the model. Later, the model is embedded in casting sand and
brought into connection with melt by way of a casting channel. When
this is done, the model is replaced by the melt. The surface
structure of the model is reproduced on the casting, forming a
cylinder liner having a structured surface, without any additional
machining being required.
[0008] In a standard case, the lost-foam casting model consists of
polystyrene.
[0009] The height variations on the surface of the cylinder liner
that form the structured surface amount to 0.8 to 5 mm, preferably
1 to 3 mm, and particularly preferably 1 to 2 mm.
[0010] In this connection, the height variations can be formed
either by grooves or by elevations, and the grooves or elevations
can run preferably in the axial direction, in the circumference
direction, or in a diagonal direction. Furthermore, grooves and
elevations can also extend in wave shape. Combinations of the
stated progressions are also possible.
[0011] The grooves can be made in the mold for the production of
the lost-foam casting model by means of milling, for example; the
elevations can be applied by means of application welding. The
erosion method is also a possibility.
[0012] The mold for the production of the lost-foam casting model
must be parted in such a manner that the lost-foam casting model
can be reliably unmolded. It can particularly be divided into two
mold halves or four mold parts.
[0013] FIG. 1 shows a surface, according to the invention, of a
mold for the production of a lost-foam casting model. The surface
shows diagonally running grooves 1. Likewise, however, elevations
can also be formed instead of the grooves. The surface is divided
into diamond-shaped individual areas 2 by the grooves 1.
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