Method and grinding machine for the complete grinding of short and/or rod-shaped workpieces
AssigneeErwin Junker Maschinenfabrik GmbH
InventorGeorg Himmelsbach
Life of this patent
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Abstract
Short and/or rod-shaped workpieces are completely machined by grinding two parallel end faces and the longitudinal sides of the workpiece with very short cycle times. The grinding machine includes two grinding spindles that are arranged in a tandem arrangement with parallel rotational axes on a shared grinding headstock and that are jointly moved in the X direction. In cooperation with a special holding and transport device for the workpieces, two workpieces are each ground, at least partly concurrently, the end faces of the one workpiece being ground in one machining position and the final non-circular grinding of the exterior contour of a second workpiece occurring in a second machining station, the end faces of the second workpiece having already been ground.
Claims26
Grinding machine for grinding rod-shaped workpieces having a non-circular cross-section formed by at least one of straight and curved lines and flat end faces that run parallel to one another, comprising:
- a machine bed supporting a slide track on which are arranged on a common axis C two workpiece headstocks adjustably axially spaced from each other;
- wherein the workpiece headstocks comprise respective clamping jaws having respective clamping surfaces facing one another;
- and
- each workpiece headstock further comprises an electric motor for rotating a respective one of the clamping jaws about the C-axis;
- a control device configured to cause the two clamping jaws to rotate synchronously and in-phase and to clamp the workpiece by moving against the end faces of the workpiece;
- a grinding headstock arranged on the machine bed such that it can be moved in a controlled manner along an X axis perpendicular to the C axis;
- a first grinding wheels or wheel and a second grinding wheel carried by the grinding headstock, rotationally driven first and second grinding parallel spindles on which are respectively mounted the first grinding wheels or wheel and the second grinding wheel, the grinding wheels being arranged above one another such that the first grinding wheels or wheel is higher and closer to a perpendicular plane of symmetry of the slide track than the second grinding wheel;
- wherein the first grinding wheels or wheel defines a space laterally bounded by opposed walls surfaced with abrasive layers spaced apart by distances substantially equal to length of the workpiece for grinding the end faces of the workpiece;
- and wherein axial width of the second grinding is at least equal to length of the workpiece for grinding longitudinal sides of the workpiece;
- a holding device arranged between the workpiece headstocks, mounted for being rotationally driven about an axis parallel to axes of the spindles and carrying at least three angularly spaced pairs of grippers;
- wherein each pair of grippers is configured for clamping the workpiece on its longitudinal sides and for bringing it with a longitudinal axis thereof parallel to the C axis into a first machining position for grinding the end faces thereof concurrently by said opposed walls surfaced with said abrasive layers and for subsequently transferring the workpiece to a second machining position at which the workpiece is clamped by the clamping jaws;
- wherein the second grinding wheel is located in the second machining position and the control device is also configured to effect grinding of the longitudinal sides of the workpiece by controlling rotation of the workpiece about the C axis and movement of the second grinding wheel in a direction along the X axis.
Grinding machine for complete machining of workpieces having longitudinal sides and circular or non-circular cross-sections, comprising;
- first grinding wheels comprising opposing main bodies defining grinding layers that face one another for concurrently grinding outermost end faces of the workpieces upon receipt of the end faces therebetween the grinding layers,
- a second grinding wheel for grinding the longitudinal sides of the workpieces,
- a holding device for holding and moving the workpieces to the first grinding wheels and the second grinding wheel in succession,
- a grinding headstock that is controllable so as to be movable along an axis that is perpendicular to the workpieces held by the holding device, and
- first and second parallel spindles carried by the grinding headstock so that said spindles are spaced vertically relative to each other and on which the first grinding wheels and the second grinding wheel are respectively mounted to be rotationally driven, the first grinding wheels and the second grinding wheel being offset from one another so that the workpieces are moved by the holding device to the first grinding wheels or before the second grinding wheel so that the first grinding wheels come into grinding contact with the end faces of a first workpiece as the second wheel is positioned into grinding contact with the longitudinal sides of a second workpiece in succession.
Grinding machine for complete machining of workpieces having longitudinal sides and circular or non-circular cross-sections, comprising
- first grinding wheels or wheel for concurrently grinding end faces of the workpieces,
- a second grinding wheel for grinding the longitudinal sides of the workpieces,
- a holding device for moving the workpieces to the first grinding wheels and the second grinding wheel,
- a grinding headstock, and
- first and second parallel spindles carried by the headstock and on which the first grinding wheel or wheels and the second grinding wheel are respectively mounted to be rotationally driven, the first grinding wheels or wheel and the second grinding wheel being offset from one another so that the workpieces are moved by the holding device to the first grinding wheels or wheel before the second grinding wheel and the first and second grinding wheels and the holding device being movable relative to each other along an axis X perpendicular to axes of the spindles, the holding device comprising a timing disk in which the workpieces are held angularly spaced apart from one another on the circumference of the disk at respective first clamping positions comprising respective gripper sets and are moved to the grinding wheels by rotating the timing disk, and each of the first clamping positions further comprising a steady configured for positioning against the workpieces during grinding of the workpieces by the second grinding wheel.
Dependencies are inferred from the claim text.