Valve Body Remanufacturing via Hardened Insert Segmentation
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Solution Overview
Problem
Existing remanufacturing strategies for valve seats in fuel injectors often fail to maintain performance due to wear and damage, as they typically involve regrinding, which can expose softer materials and limit the number of remanufacturing cycles, especially when hardened material has been previously removed.
Innovation Solution
A process involving the removal of the original valve seat and guide bore from a salvaged valve body, followed by the insertion of a hardened material insert with a newly machined valve seat and guide bore, ensuring the insert is made of harder material suitable for the service environment, allowing for precise re-establishment of the valve timing and preventing exposure of softer materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If regrinding of the valve seat is performed to remove wear, then the valve seat surface can be restored, but the hardened material is removed and softer material is exposed, rendering the fuel injector unsuitable for use
Solution Approach 1:
The valve body is divided into two segments: the original valve body and a separate insert. The insert contains the valve seat and is made entirely of hardened material, while the valve body can be made of softer material. This segmentation allows the hardened insert to be replaced independently when worn, preserving the valve body for further service.
Solution Approach 2:
The hardened material portion (insert) is extracted as a separate replaceable component from the valve body. When the valve seat wears out, only the insert needs to be removed and replaced, rather than scrapping the entire valve body. This extraction enables multiple remanufacturing cycles.
2Duration of action of moving object
If hardened material is removed in a prior round of remanufacturing, then the valve seat can be restored, but subsequent remanufacturing becomes impossible as all hardened material is gone
Solution Approach 1:
The valve assembly is segmented into a permanent valve body and a replaceable insert. The insert contains all the hardened material needed for the valve seat and guide bore. This segmentation allows the insert to be replaced multiple times while the valve body remains in service, enabling multiple remanufacturing cycles.
Solution Approach 2:
The hardened insert is designed to be discarded and replaced rather than reground repeatedly. When the insert wears out, it is removed and a new insert is installed in the valve body. This approach recovers the valve body for continued use while replacing only the worn insert component.
3Duration of action of stationary object
If an insert made of hardened material is positioned in place of the removed valve seat and guide bore material, then multiple remanufacturing cycles are enabled, but the device complexity increases
Solution Approach 1:
The hardened insert is designed as a disposable or limited-life component that can be replaced relatively easily. When the insert wears out, it is removed and replaced with a new one, rather than attempting to restore the original valve body. This simplifies the remanufacturing process to a straightforward insert replacement operation.
Data Source
AI summary
A process for remanufacturing valve bodies such as fuel injector valve bodies includes receiving a salvaged valve body having a first segment, a second segment and a middle segment which includes a valve seat and a guide bore for a valve therein. The process further includes removing material of the valve body where the valve seat and the guide bore are disposed, and positioning an insert within the valve body in place of the removed material. A new valve seat and a new guide bore are then machined in the insert, including locating for machining the new valve seat and new guide bore on a timing face of the valve body.