By Josh Cosford, Contributing Editor
Skiving is removing the outer cover at the end of a hydraulic hose in the location of the crimp fitting. For some high-pressure applications, the hose&#;s inner tube ID may be skived to allow the hosetail to better fit. Using a specialized machine with externally rotating mandrels, the tooling cuts and then peels the outer carcass. Depending on the machine, the skiving process may take thirty to forty-five seconds.
The assembly technician must reference the manufacturer&#;s catalogue to mark the skive&#;s length, which corresponds to the mark length used to subtract the coupling length from the overall length. The coupling length is the distance from the tip of the cut hose to the outside tip of the hose end when the hose is installed. The total length of a hose assembly equals the hose cut length plus the sum of each of the two coupling lengths.
Once the skiving process removes the inner or outer rubber layer(s), the remaining hose end is left with its steel braids or windings nearly exposed. A single skive leaves only the outer layer exposed, while its combination with a tube skive is often referred to as a double skive. Where single- or double-skived are chosen depends on the rated pressure, with double skiving more often used in very high-pressure applications.
Once skived, the hose end may be fitted and crimped to the hose. Skived hose assemblies require crimp ends specific to the application and are not compatible with non-skive fittings. A skived hose assembly bites into the reinforcement wires, and as such, is dimensioned differently to avoid breaking through the cover.
Skived hose assemblies are used in applications where ultimate reliability under high-pressure conditions is an absolute must. Because the crimp occurs directly on the wire braiding or spiral, the force exerted is across a more stable surface. A skived hose assembly has less chance of failure, and when done correctly, these hoses rarely fail. Many machinery manufacturers swear by the reliability and safety of a skived hose assembly, requiring them for all applications.
Here are multiple hydraulic hose specifications, and hydraulic hoses can be categorized into skive hydraulic hose and no-skive hydraulic hose based on the hydraulic hose cover.
In this guide, let&#;s see the skive vs no skive hydraulic hose, and this is the explanation of the advantages of skive versus no skive hydraulic hose.
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Skive refers to the fact that you need to remove or shave some parts of the hydraulic hose cover, and/or inner tube prior to the hydraulic hose ends to fit the size of the hydraulic hose fittings, for hydraulic hose assemblies.
The skive hydraulic hose has a thicker hydraulic hose cover; you have to shave some layers of hydraulic hose rubber cover to make it much slimmer and thinner to make it much easier to insert into the hydraulic hose fittings.
The hydraulic hose skiving machine can help you shave the hydraulic hose cover, making it suitable for the hydraulic hose fitting size, to connect the hydraulic hoses to complete the hydraulic hose installation.
Here we have a hydraulic hose SAE 100r1A/DIN EN853 1ST with a thicker hydraulic hose cover. This is for you to use the hydraulic hose skiving tool to shave hydraulic hose cover rubber during the hydraulic hose assembling process.
And this is the video showing you how to skive the hydraulic hose.
The no-skive hydraulic hose is designed without needing the skiving step, this is the ready-to-assemble hydraulic hose, and the non-skive hydraulic hose is manufactured with the thinner hydraulic hose, compared with the skive hydraulic hose.
PS: Sometimes, the &#;No-Skive&#; is printed on the hydraulic hose layline, which can tell the hydraulic hose technicists don&#;t need to use the hydraulic hose skiving blade to remove the hydraulic hose cover. And the &#;No-Skive&#; hydraulic hose is applied widely due to the convenience of assembling hydraulic hose.
The difference between the skive hydraulic hose and the non-skive hydraulic hose is the thickness of the hydraulic hose cover. The thicker hydraulic hose cover needs to be shaved before crimping the hydraulic hose into the hydraulic hose fittings.
If you have any questions about the skive vs no-skive hydraulic hose, be pleased to contact us at any time.