The CNC crankshaft grinding machine is a specialized equipment that achieves high-precision machining through a CNC system. It is primarily used for the precision grinding of crankshaft main journals, connecting rod journals, and thrust surfaces, and is suitable for mass production in the automotive, internal combustion engine, shipbuilding, and defense industries.
Its core configuration includes a dual grinding wheel head layout, CBN grinding wheels (with a linear speed of 120-200 m/s), and a high-rigidity hydrostatic spindle system. Combined with linear servo motor drive and closed-loop control technology, the minimum setting unit reaches 0.1 μm. Using cutting point tracking grinding technology, it achieves multi-journal synchronous machining through precise interpolation movement between the grinding wheel and the workpiece. Combined with online measurement and automatic compensation functions, it can complete multi-process grinding in a single clamping operation, achieving a roundness accuracy of 0.002-0.015 mm. Typical CNC systems include Siemens 840DSL, supporting six-axis linkage control and automatic grinding wheel dressing, enhancing the flexibility of mass production.
Performance and Structure
The machine tool structure has a reasonable layout, full protection, and is easy to maintain, meeting ergonomic requirements.
The grinding wheel spindle system has high rotational accuracy and strong rigidity; the CBN grinding wheel linear speed can reach 120 m/s.
It adopts a fixed worktable and a rear-mounted cross-slide for the dual grinding wheel heads, enabling grinding wheel head feed and movement (X1, X2, Z1, Z2 axes).
The grinding wheel head feed (X1, X2 axes) is directly driven by a linear servo motor with a closed hydrostatic guide structure; the minimum setting unit is 0.1 μm, and the maximum rapid traverse speed can reach 40 m/min, meeting the accuracy requirements for connecting rod journal grinding.
The grinding wheel head slide movement (Z1, Z2 axes) is driven by an AC servo motor and ball screw pair.
The workpiece rotation axis (C1, C2 axes) uses a high-precision rolling bearing spindle structure, equipped with an angle encoder for closed-loop feedback control, achieving extremely high rotational accuracy and positioning accuracy.
It is equipped with advanced imported active measurement devices to achieve full closed-loop control of the grinding process. Equipped with crankshaft connecting rod journal follow-up grinding software and user-specific grinding interface software, it achieves high-precision follow-up grinding and online automatic compensation during a single clamping process of the crankshaft part.
