Abstract
Vacuum brazed steel-copper laminate could be used in high-pressure hydraulic manifolds in order to reduce size, weight and allow use of complex designs. The durability of such material is unknown. Samples were manufactured and static and dynamic tests were conducted. Results showed reduced material performance due to heat treatment. A hydraulic test manifold was manufactured and a long-term pressure load test was conducted. The material showed surprisingly good durability and pressure hull did not break in tests. A microscopic study was performed and only solidified copper in the corners had micro cracks after 10 million test cycles.
Highlights
Steel has been used for hydraulic high-pressure (20–35 MPa) valve manifolds due to good characteristics in both use and in machining
The aim of this study is to study the limitations and characteristics of laminated structures for use in hydraulic manifolds in general
The study showed that vacuum brazed steel-copper structure has lower yield strength than solid steel but considerably higher than copper
Summary
Steel has been used for hydraulic high-pressure (20–35 MPa) valve manifolds due to good characteristics in both use and in machining. Downside of the traditional approach is size and weight and since conventional machining methods set limitations on manifold design. Typical manifolds are cubic-shaped, and drillings are made perpendicular from each face. It was notices that some of the pieces had some 0.5–1.0 mm deviation in axial direction. This material does not seem to endure conventional manufacturing methods as well as was hoped. One test sample has 35 brazed copper-steel connections in the middle part with 10 mm diameter. This means maximum of 210 μm of copper and likely less
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