is a key functional component of CNC machine tools. Driven by a servo motor, precision transmission mechanisms (such as worm gears and harmonic reducers) and high-precision detection devices (such as grating scales and encoders), it achieves automatic indexing, continuous rotation or positioning in the circumferential direction. It can be linked with the X/Y/Z axes of the CNC machine tool to complete the processing of complex curved surfaces and multi-sided workpieces. It is the core equipment for realizing "multi-process integration" and "high-precision indexing".
|
|
|
|
|
|
The table is placed horizontally, with good radial stability, suitable for small and medium-sized parts |
|||
|
Large transmission ratio (up to 100:1), high positioning accuracy, suitable for low-speed indexing |
|||
|
High transmission efficiency, small return clearance (<=1'), suitable for high-speed linkage |
High-speed milling of impellers and camshafts |
||
|
No mechanical transmission gap, fast response speed, and extremely high positioning accuracy (<=±3″) |
High-end aerospace parts, medical parts |
1. Indexing Machining of Multi-Sided/Multi-Station Parts
Case parts such as transmission cases and engine blocks require multi-faceted machining of threaded and smooth holes on the front, rear, left, and right sides of the case. This process uses a rotary table indexing function to sequentially machine threaded and smooth holes, ensuring coaxiality and positional accuracy (e.g., <=0.02mm) for each hole system.
For example, "Circumferential Hole Machining" for flanges: The worktable is indexed at 360℃/N (N=number of holes), and bolt holes are drilled, reamed, or milled sequentially along the circumference, ensuring an angular error of <=±5″ between holes.
Valve Parts: For example, "Multi-Station Sealing Surface Machining" for ball valve bodies: After indexing, the valve body's water inlet, outlet, and valve core groove are machined sequentially to ensure the coaxiality and perpendicularity of each sealing surface.
2. Coordinated Machining of Complex Surfaces and Contours
Impeller/Blade Parts: For example, aircraft engine turbine impellers and centrifugal compressor impellers: The rotary table (C-axis) drives the workpiece, coordinated with the milling motion of the X/Y/Z axes, to produce a twisted blade profile with a surface accuracy of <=0.03mm.
Cam Camshaft parts: such as automotive engine camshafts – The rotary table rotates according to the motion of the cam profile, while the Z-axis (milling cutter) rises and falls with the profile, machining the cam surface that controls valve opening and closing, ensuring a cam lift error of <=0.01mm.
Mold cavity parts: such as complex curved molds (e.g., mobile phone case molds) – The rotary table and linear axis are linked to create deep cavities and circular transitions, avoiding the "tool interference" problem encountered in traditional machining.
3. Precision Turning/Milling of Circular Surfaces
Circular milling of cylindrical parts: such as keyway machining on motor shafts – The workpiece is clamped on the rotary table, which rotates at a constant speed, while the milling cutter (X-axis) rotates the workpiece. The CNC rotary table is fed into the workpiece (axis) to produce circumferentially distributed keyways, ensuring keyway symmetry <=0.02mm.
Circumferential positioning machining of special-shaped parts: such as eccentric hole machining of eccentric shafts – Through precise positioning of the rotary table, the eccentric reference is found before hole machining, avoiding part failure caused by eccentric errors.
4. Flexible Manufacturing System (FMS) and Automation Integration
Mass machining of automotive parts: such as the machining of automotive wheel hub bearing seats – A robot clamps the workpiece onto the rotary table, which then indexes the workpiece through the multi-step process of "rough milling - fine milling - drilling - tapping." After completion, the robot unloads the workpiece, achieving efficient "one person, multiple machines" production.
Automated production of medical device parts: such as the machining of titanium alloy artificial joints – The rotary table is linked with the five-axis machine tool to complete the precision machining of the joint spherical surface and mortise and tenon. At the same time, closed-loop testing is used to ensure machining accuracy to meet medical-grade requirements.
