I.D. Honing of Hydraulic Sleeves for a Heavy Equipment Application

At Midway Grinding Inc., we specialize in providing our customers with high precision, large volume products at competitive prices and with short lead times. The project highlighted here exemplifies these capabilities.

Most high volume applications pose challenges in one form or another; in this project maintaining the quality of the incoming blanks was a critical factor. This family of product is designed for use as a hydraulic sleeve in hydraulic cartridge valves for a heavy equipment application. Composed of 12L14 H.T., the sleeves required I.D. honing and single pass diamond bore finishing. They featured dimensions of .600" in diameter and 2" in length and needed to be produced in lots of 10,000 pieces bi-weekly.

The process begins on our Sunnen ML4000, which provides the roughing operation; this is followed by the finishing on our single pass bore sizing machine. These advanced capabilities allow us to maintain the extremely tight tolerances of .0001" overall, and .00005" for roundness. In-process testing and inspection is provided by our Federal Air Gaging, Talyrond 365 roundness tester, and Zeiss profilometer.

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I.D. Honing Project Highlights

Product Name Hydraulic Sleeves
Product Description These sleeves are used in hydraulic cartridge valves.
Capabilities Applied/Processes Primary: I.D. Honing
Secondary: Single Pass Diamond Bore Finishing
Equipment Used to Manufacture Part Sunnen ML4000 for Roughing operation
Single Pass bore sizing machine for finishing operations
Overall Part Dimensions Approximately .600" diameter x 2.0" length
Tightest Tolerances .0001 size
.00005 roundness
Material Used 12L14 H.T.
Material Finish Heat Treated
In process testing/inspection performed Federal Air Gaging, Talyrond 365 roundness tester, Zeiss profilometer
Industry for Use Hydraulic, Heavy Equipment
Volume 100,000 +++ EAU
Delivery/Turnaround Time 10,000 pc lots in 2 weeks or less
Standards Met Customer supplied print
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