Device for producing piston

A piston and casting production technology, applied in the field of piston devices, can solve problems such as easy fracture of the core

Inactive Publication Date: 2015-11-11
MAHLE INT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this device has the disadvantage that the mechanically extremely sensitive core is gripped by pre-stressing from the inside, whereby especially C-shaped cores, ie cores that do not form a closed loop, are particularly susceptible to fracture.

Method used

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  • Device for producing piston
  • Device for producing piston

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Embodiment Construction

[0021] Such as figure 1 As shown, a device 1 for producing pistons for internal combustion engines by casting has a casting mold 2 with an upwardly open chamber 3 in which a core 4 (for example a salt core or a sand core) configured to form a cooling duct can be arranged. chamber 3. Likewise, a core holding device 5 is also provided for introducing the core 4 into the casting mold 2 (see inter alia figure 2 ). According to the invention, the core holding device 5 has a gripping device 6 with a telescopic lower inner gripper 7 adjustable between a first position and a second position, in In a first position, they are arranged radially inwards and in this state can be pushed through the core 4, in a second position they have moved radially outwards and have a radial direction forming a support for the core 4. Out towards area 8. The area 8 is in this case formed in the form of a protrusion. In its first position, the inner gripper 7 has an outer diameter smaller than the i...

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PUM

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Abstract

An apparatus for producing a piston may include a casting mould having an axially open cavity defining a surrounding cavity wall, the cavity wall being profiled to receive an annular core to define a cooling duct geometry. A core holding device may be adjustable in an axial direction for introducing the core into the casting mould. The core holding device may include a gripping device for gripping the core. The gripping device may include a plurality of spreadable first grippers. The plurality of first grippers may be adjustable at least between a first position, in which the plurality of first grippers are arranged in a radially inner position, and a second position, in which the plurality of first grippers transition radially outwards in relation to the first position and support the core.

Description

technical field [0001] The invention relates to a device for producing pistons for internal combustion engines by casting according to the preamble of claim 1 . The invention also relates to a method for producing such a piston. Background technique [0002] Due to the increased performance requirements, modern cast pistons, especially light alloy pistons, usually have cooling ducts which are produced during casting by means of cores, especially sand cores or salt cores. After the molten material has solidified, the core is washed out again, thus leaving the desired cooling ducts. In order also to be able to absorb the high loads that occur on the piston rings, the aforementioned light alloy pistons usually have a cast ring insert, in particular of cast iron, into which the piston ring can be arranged later. When installing such ring inserts or sand cores or salt cores in casting molds for light-alloy pistons, the problem often arises that the ring inserts are temperature-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/22
CPCB22C9/24B22C9/10B22C9/108B22C23/00
Inventor 米夏埃尔·米特尔施泰特
Owner MAHLE INT GMBH
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