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Method for manufacturing salt cores for manufacturing workpieces by casting

A workpiece and salt melting technology, which is applied in the core field of manufacturing workpieces, can solve problems such as difficult to reproduce

Inactive Publication Date: 2017-06-09
MAHLE INT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the case of pressed salt cores, rough surfaces of this type can only be produced with widespread reprocessing and are difficult to reproduce precisely

Method used

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  • Method for manufacturing salt cores for manufacturing workpieces by casting
  • Method for manufacturing salt cores for manufacturing workpieces by casting
  • Method for manufacturing salt cores for manufacturing workpieces by casting

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Experimental program
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Embodiment Construction

[0023] figure 1 A first exemplary embodiment of a piston 10 according to the invention is shown. The piston 10 has a piston head 11 and a piston shaft 12 axially engaged with the piston head 11 . The piston head 11 has a combustion recess 13, a circumferential fire land 14 and a circumferential ring 15 with annular grooves (not shown) for receiving piston rings. In the exemplary embodiment, piston 10 is a one-piece cast piston made of any suitable metallic material. However, the invention also covers a two-part piston having a piston head and a piston shaft, wherein at least the piston head is cast from any suitable metallic material.

[0024] A circumferential cooling duct 16 is arranged in the piston head 11 flush with the ring 15 . The cooling duct 16 has an elongated elliptical cross-section, the major axis of which is inclined relative to the piston axis, which makes particularly effective cooling of the piston head including the radially outer region of the combustion...

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Abstract

The present invention relates to a method for the production of cores for producing workpieces by casting, particularly annular cores for forming cooling galleries in pistons or piston parts for combustion engines to be produced by casting, wherein the cores are cast by placing a molten salt used as a casting material, with high flow speed and limited pressure, into a cavity of a mould die arrangement corresponding to the core or cores to be produced, wherein the flow speed and the temperatures of the salt melt and the mould parts are selected such that the salt melt begins to solidify only once the cavity is completely filled, and the pressure is limited to a maximum value at which a deformation of the mould parts remains below a tolerance value.

Description

technical field [0001] The invention relates to a method for producing by casting a core for producing a workpiece, in particular for forming a cooling duct for a piston or a piston part of an internal combustion engine, the core being produced by casting. Background technique [0002] Regardless of their method of manufacture, internal combustion engine pistons must have cooling ducts near the edge of the piston head into which oil can be injected from the engine's crank space when the internal combustion engine is in operation to prevent thermal overload. In this context, in pistons or piston parts to be produced by casting, it is particularly desirable to form cooling ducts in the form of annular ducts with a ring plane parallel to the piston head, through which the oil can then pass through the feed and discharge channels Flowing through the cooling conduit, the inlet and outlet channels open into the crank space of the internal combustion engine. [0003] When manufact...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/08B22C9/10F02F3/18
CPCB22C9/08B22C9/105F02F3/18F02F3/22F02F2003/0007
Inventor 米夏埃尔·米特尔施泰特
Owner MAHLE INT GMBH