The locating elements for spiral bevel gears are V-shaped blocks and press plates.
After positioning the workpiece, before drilling, it must be clamped with clamping device. The clamping device uses air pressure to drive double-sided bevel wedge motion to tighten the press plate, so as to ensure that the workpiece does not displace or vibrate under the action of cutting force, gravity, inertia force, etc., which affects the quality of machining and even makes the processing impossible to proceed smoothly.
From the part drawing, it can be seen that the gear shaft is a revolving surface. Since each outer circle has been processed during gear machining, each outer circle surface can be used as a positioning reference. Because the small end journal of spiral bevel gear is 50mm and the Journal M27mm are mating surfaces, from the aspect of part design, the end face of 50mm journal is also the design reference, and its axis is the reference of form and position tolerance.
Therefore, the locating datum for toothed machining should be the end face of 50 mm and M27mm journals.Five degrees of freedom for X-movement, z-movement, y-rotation and Z-rotation can be limited by positioning on this basis, and then six degrees of freedom can be limited by fixing both ends.
From the part drawing, it can be seen that the gear shaft is a revolving surface. Since each outer circle has been processed during gear machining, each outer circle surface can be used as a positioning reference. Because the small end journal of spiral bevel gear is 50mm and the Journal M27mm are mating surfaces, from the aspect of part design, the end face of 50mm journal is also the design reference, and its axis is the reference of form and position tolerance.
Therefore, the locating datum for toothed machining should be the end face of 50 mm and M27mm journals.Five degrees of freedom for X-movement, z-movement, y-rotation and Z-rotation can be limited by positioning on this basis, and then six degrees of freedom can be limited by fixing both ends.