CNC Turned Sleeve
Typical installations include hydraulic cylinders for earthmoving machinery, machine tool spindle protection sleeves, chemical high-pressure plunger sleeves, and plastic injection barrel liners, providing continuous fluid sealing and low-friction guiding under internal pressure cycles.
- Product Introduction
Deep-Bore Thin-Wall Sleeves & High-Pressure Hydraulic Isolation
Machined from carbon steels, alloy steels, and stainless tubes, these tubular components serve as wear-resistant fluid barriers and piston guides in fluid power systems. Typical installations include hydraulic cylinders for earthmoving machinery, machine tool spindle protection sleeves, chemical high-pressure plunger sleeves, and plastic injection barrel liners, providing continuous fluid sealing and low-friction guiding under internal pressure cycles.
Long-Stroke Cylindricity & Wall Thickness Uniformity Breakthrough
Deep-bore machining in thin-walled tubular sleeves can result in bore chatter or wall-thickness variations due to boring bar overhang. Machining cells use damped boring bars coupled with high-pressure internal chip-evacuation systems to absorb transverse vibrations. Continuous fine-boring feeds coupled with steady-rest alignment keep bore cylindricity uniform over lengths up to 1500 mm, maintaining consistent wall thickness for reliable burst-pressure containment.
Product Specifications
|
Parameter |
Specification |
|
Maximum Machining Size |
Outer diameter Φ300 mm, length 1500 mm |
|
Wall Thickness Range |
2 mm – 30 mm |
|
Geometric Accuracy |
Bore cylindricity ≤ 0.01 mm, straightness ≤ 0.02 mm per 300 mm |
|
Metrology Equipment |
Internal micrometers, pneumatic gauges, ultrasonic thickness gauges |
Vibration-Damped Deep-Hole Turning & Stress Relief Annealing
To prevent thin-wall tube stock from expanding under tool pressure, specialized pull-boring techniques and floating reamers are deployed. Between heavy roughing and finish boring passes, sleeves undergo stress-relief annealing in vertical pit furnaces to stabilize internal grain structures. Final finish passes are performed in temperature-controlled cells to prevent dimensional shift after parts are released from workholding.
Ultrasonic Wall-Thickness Mapping & Anti-Collision Packaging
In addition to internal bore measurements, ultrasonic thickness gauges scan parts circumferentially and axially to confirm wall thickness uniformity and eliminate thin spots that could compromise pressure ratings. Straightness is verified using optical alignment instruments. Sleeves are coated with rust-inhibiting oil, fitted with protective end caps, wrapped in bubble wrap, and secured in custom wooden crates with internal support cradles.
FAQ
Q: Can pressure testing data be provided for sleeves intended for high-pressure hydraulic service?
A: Hydrostatic pressure tests can be performed to designated test pressures. Inspection documentation can include pressure hold logs, dimensional checks before and after pressurization, and proof of zero permanent plastic deformation.
Q: How are internal bores of the CNC Turned Sleeve protected against corrosion during ocean shipping?
A: Bores are ultrasonically cleaned, hot-air dried, and coated with an atomized rust-preventative oil film. The ends are sealed with tight-fitting plastic caps containing desiccant packets to prevent moisture ingress during transport.
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