Casting mould and piston produced with the casting mould

Patent metadata

Field	Value
Publication number	US-2016236273-A1
Application number	US-201415027979-A
Country	US
Kind code	A1
Filing date	Sep 23, 2014
Priority date	Oct 8, 2013
Publication date	Aug 18, 2016
Grant date	—

Abstract

A casting mold for casting a piston for an internal combustion engine may include a mold body having a surface texture in a region corresponding to a subsequent internal surface of a piston skirt. The surface texture may be defined by a plurality of grooves. The plurality of grooves may have the following dimension: a depth of 0.2 mm<t<0.5 mm, a width of 0.02 mm<b<0.05 mm, and at least two groove walls which are inclined outwardly at 0°<α<10°.

First claim

1 . A casting mold for casting a piston for an internal combustion engine, comprising: a mold body having a surface texture in a region corresponding to a subsequent internal surface of a piston skirt, wherein the surface texture is defined by a plurality of grooves, and wherein the plurality of grooves have the following dimensions,
a depth of 0.2 mm<t<0.5 mm, a width of 0.02 mm<b<0.05 mm, and at least two groove walls which are inclined outward at 0°<α<10°.

2 . The casting mold as claimed in claim 1 , wherein the plurality of grooves define a quadrilateral structure.

3 . The casting mold as claimed in claim 1 , wherein at least two grooves of the plurality of grooves have a distance of approximately 0.2 mm<a<2.0 mm between one another.

4 . The casting mold as claimed in claim 1 , wherein the plurality of grooves are formed via a laser.

5 . The casting mold as claimed in claim 1 , further comprising a coating disposed on the surface texture.

6 . The casting mold as claimed in claim 1 , wherein the surface texture has a square waffle pattern.

7 . A piston cast in a casting mold comprising: a piston part having an internal surface, and a surface texture disposed on the internal surface defined by a plurality of grooves, wherein the plurality of grooves have the following dimensions,
a depth of 0.2 mm<t<0.5 mm, a width of 0.02 mm<b<0.05 mm, and at least two groove walls which are inclined outward at 0°<α<10°.

8 . The piston as claimed in claim 7 , wherein the piston part is a cast piston skirt.

9 . The piston as claimed in claim 7 , wherein the plurality of grooves define a quadrilateral structure.

10 . The piston as claimed in claim 7 , wherein at least two grooves of the plurality of grooves have a distance of approximately 0.2 mm<a<2.0 mm between one another.

11 . The piston as claimed in claim 7 , further comprising a coating disposed on the surface texture.

12 . The piston as claimed in claim 11 , wherein the coating includes a release agent.

13 . The piston as claimed in claim 7 , wherein the surface texture has a square waffle pattern.

14 . The casting mold as claimed in claim 2 , wherein at least two grooves of the plurality of grooves have a distance of approximately 0.2 mm<a<2.0 mm between one another.

15 . The casting mold as claimed in claim 14 , wherein the surface texture has a square waffle pattern.

16 . The casting mold as claimed in claim 15 , further comprising a coating disposed on the surface texture.

17 . The casting mold as claimed in claim 16 , wherein the coating is a release agent.

18 . The casting mold as claimed in claim 3 , wherein the surface texture has a square waffle pattern.

19 . The casting mold as claimed in claim 5 , wherein the coating includes a release agent.

20 . A casting mold for casting a piston, comprising:
a mold body having a surface texture in a region corresponding to an internal surface of a piston skirt; wherein the surface texture as a quadrilateral pattern and is defined by a plurality of grooves, and wherein the plurality of grooves have the following configuration:
a depth of 0.2 mm<t<0.5 mm;
a width of 0.02 mm<b<0.05 mm; and
at least two groove walls inclined outwardly from one another at 0°<α<10°; and
wherein at least two grooves of the plurality of grooves have a distance of approximately 0.2 mm<a<2.0 mm between one another.

Assignees

• Mahle Int Gmbh

Inventors

• Tilch Peter
• Zarges Dieter

Classifications

• F02F3/0076

  the inside of the pistons being provided with ribs or fins · CPC title

• B22C9/06

  Permanent moulds for shaped castings (moulds for ingots B22D7/06) · CPC title

• F02F3/02

  having means for accommodating or controlling heat expansion · CPC title

• F02F2003/0007

  Monolithic pistons; One piece constructions; Casting of pistons · CPC title

• B22D25/02

  by its peculiarity of shape; of works of art {(cylinders, pistons B22D15/02)} · CPC title