Rotating Unions for Machine Tools
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Catalog excerpts

Rotating Unions for Machine Tools - 1

ENGINEERING CATALOGUE ROTATING UNIONS f or M ac h i n e To o l s , M a c hining Ce nt re s, a nd Tra nsfe r Lines w w w . d e u b l i n . e u

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Rotating Unions for Machine Tools - 2

4 STEPS TO FINDING THE CORRECT UNION SERIES FOR YOUR MACHINE TOOL APPLICATION 1 Does the machine have a single supply connection (for example, coolant) or multiple connections (such as a combination of coolant, air, and hydraulic oil)? What fluid or fluids must be transferred by the rotating union? What is the maximum pressure required? What is the maximum spindle speed required? Coolant or MQL (always present during rotation) 1116 series (p. 13) 1101 series (p. 12) up to 70 bar 1005 series (p. 11) Coolant or MQL - unlimited dry run possible (rotation with no coolant is possible) Coolant or...

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Rotating Unions for Machine Tools - 3

HOW TO GET THE MOST VALUE FROM THIS CATALOGUE If you are less familiar with machine tool applications of rotating unions, or if you would like a quick review, first please read the “Information” sections. These sections contain important details about designing, installing and using rotating unions in machine tools. TABLE OF CONTENTS Information for Designers of Machine Tools Operating Principles of Rotating Unions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Selecting the Right Rotating Union for Your Application. . . . . . . . . . . . . . . 5, 6 Mounting Tolerances. . . ....

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Rotating Unions for Machine Tools - 4

INFORMATION FOR DESIGNERS OF MACHINE TOOLS OPERATING PRINCIPLES OF ROTATING UNIONS Advantage of Through-Spindle Coolant (TSC) Nearly all modern machine tools and machining centres are equipped with so-called “flood coolant”. High-speed cutting tools require both cooling and lubrication to reduce the rate of tool wear and to prevent overheating, which degrade the tool’s strength. Flood coolant systems spray coolant fluid onto the work piece near the cutting tool. But for many machining operations, such as milling or hole drilling, these systems are less effective at getting coolant fluid to...

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Rotating Unions for Machine Tools - 5

INFORMATION FOR DESIGNERS OF MACHINE TOOLS SELECTING THE RIGHT UNION FOR YOUR APPLICATION Bearing-supported Rotor-mounted Bearing-supported Bore-mounted Example: DEUBLIN 1109 series Example: DEUBLIN 1109 series Example: DEUBLIN 1117 series Bearing or Bearingless? Rotating unions for machine tool applications are available in bearing-supported and bearingless configurations. Each kind has advantages and disadvantages for the machine tool designer. Bearing-supported unions are easy to install and replace, because of their one-piece design. DEUBLIN makes two different mounting styles. The...

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Rotating Unions for Machine Tools - 6

INFORMATION FOR DESIGNERS OF MACHINE TOOLS SELECTING THE RIGHT UNION FOR YOUR APPLICATION Which DEUBLIN Seal Technology? DEUBLIN offers five different seal technologies, in order to provide the best solution for every machining application. Only DEUBLIN can offer such flexibility to the machine tool designer. “Closed Seal”: As the name indicates, the seals stay closed with or without coolant pressure. Therefore, drain lines generally are not required. However, all rotating unions operate with a thin film of media between the seals. Over time, small, nearly invisible quantities of media can...

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Rotating Unions for Machine Tools - 7

INFORMATION FOR DESIGNERS OF MACHINE TOOLS MOUNTING TOLERANCES The interface between spindle and union must be manufactured to precise tolerance to ensure accurate, vibration-free operation. Bearingless unions and rotor-mounted, bearing-supported unions require the spindle end to be machined according to the following dimensions and tolerances: Table shows reference data: Please refer to the dimensions on the individual drawing when dimensioning the spindle. Rotor Connection A Rotor Pilot All dimensions in millimetres unless otherwise indicated. Installed Rotor Datum A is the axis of...

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Rotating Unions for Machine Tools - 8

INFORMATION FOR DESIGNERS OF MACHINE TOOLS DRAIN AND SUPPLY HOSE CONNECTIONS Drain Connections All unions, even closed-seal designs, can experience migration of minimal amounts of media across the seal faces. Such media migration keeps the seals well lubricated and avoids the permanent seal damage that comes from dry running. In addition, even the best unions eventually will need replacement. Therefore, the machine tool designer should provide adequate drainage to prevent costly spindle damage. DEUBLIN designs are very advanced, but even DEUBLIN must obey the law of gravity! Therefore, it...

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Rotating Unions for Machine Tools - 9

INFORMATION FOR USERS OF MACHINE TOOLS INSTALLATION TECHNIQUES Installing a DEUBLIN Rotating Union is as easy as 1-2-3. For maximum life and reliability, maintenance engineers and service technicians need only to follow a few simple rules. 1. For bearing-supported, rotor-mounted unions, connect both supply and drain hoses to the union before mounting the union on the spindle. Otherwise, bearings in the union may become brinnelled or galled when the hose connections are tightened. 2. Clean thoroughly the mounting surfaces of the spindle before mounting the union. The spindle pilot must be...

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Rotating Unions for Machine Tools - 10

INFORMATION FOR USERS OF MACHINE TOOLS COOLANT FILTRATION AND MAINTENANCE DEUBLIN unions are designed to handle the various coolant contaminants found in most manufacturing facilities. To ensure long union life and maximum productivity, however, coolant filtration should conform to ISO 4406:1999 Code 17/15/12, SAE 749 Class 5, or NAS 1638 Class 8, with a maximum particle size of 60 microns. For comparison, pumps (both fixed piston and variable volume) such as those used in coolant systems typically require ISO 4406 Code 16/14/11 or better – in other words, half as much contamination as...

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Rotating Unions for Machine Tools - 11

DEUBLIN 1005 Series “Closed Seal” Rotating Unions for Continuous Coolant Service • Single passage for coolant or MQL • Closed seals for transfer line and similar applications • Full-flow design has no obstructions to trap swarf or debris • Bearing-supported with threaded rotor for easy installation • Labyrinth system and large vents to protect ball bearings • Balanced mechanical seals made from silicon carbide for long life even under difficult operating conditions • Anodised housing and stainless steel rotor resist corrosion Operating Data Filtration Max. Speed Max. Pressure Max. Flow Max....

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