Sand casting a diesel piston with an as-cast, reentrant combustion bowl

A bowl, diesel engine technology, applied in pistons, casting equipment, molds, etc., can solve problems such as increasing the cost of pistons

Inactive Publication Date: 2012-05-16
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These additional processes add significantly to the cost of the piston

Method used

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  • Sand casting a diesel piston with an as-cast, reentrant combustion bowl
  • Sand casting a diesel piston with an as-cast, reentrant combustion bowl
  • Sand casting a diesel piston with an as-cast, reentrant combustion bowl

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Embodiment Construction

[0052] The ablation casting method can be used to produce a piston with a dome comprising an as-cast reentrant bowl and optionally internal cooling channels. Ablation casting uses inorganic (ie, water-soluble) cores, and water is sprayed onto the mold, which is slowly washed away (hence the term "ablation"), rapidly cooling the casting. Rapid cooling produces improved mechanical properties. Ablation casting allows the production of complex parts with fine solidified microstructures. The application of water allows controlling the solidification and cooling of the part independently of each other (for example, by applying water to specific areas of the casting before other areas or by applying different amounts of water to different areas). Ablation casting allows the formation of complex parts such as those that combine There are parts with thin and thick sections, and parts with complex inner cores. The overall cross-sectional properties are superior to those of parts fabr...

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Abstract

A diesel engine piston and a method of making the piston. The method involves casting the piston with complex geometries, including undercut features. The casting uses an aggregate disposable mold that can be removed from the as-cast part. In one form, the complex geometry includes an undercut combustion bowl formed in the piston dome, while in another, it may include an internal cooling passage. The undercut bowl and internal passages may be produced using the aggregate disposable mold.

Description

[0001] Explanation of related cases [0002] This application claims the benefit of Provisional Application 61 / 405739, entitled "Sand Casting Diesel Engine Pistons with As-Cast Reentrant Combustion Bowls," filed October 22, 2010, which is incorporated herein by reference. technical field [0003] The present invention relates generally to apparatus and methods of casting engine components, and more particularly to advanced bimetallic pistons with complex features and casting methods thereof. Background technique [0004] Pistons used in internal combustion engines generally consist of a head (also called a dome), a skirt, one or more annular grooves, and lands between the annular grooves. Tighter emissions and efficiency requirements dictate that future pistons will need to operate closer to stoichiometry, at higher cylinder pressures and with tighter packaging, which in turn will result in higher component loads and operating temperature conditions inevitable. This is esp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/22B22C1/16
CPCB22D15/02B22D29/002B22D30/00F02F2003/0007B22C9/00B22D23/00B22C9/04
Inventor J.C.科普基克M.A.奥斯博恩R.D.里基
Owner GM GLOBAL TECH OPERATIONS LLC
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