Special clamp for motor shell macropore series for fine boring rail train

Abstract

The invention discloses a special clamp for a motor shell macropore series for a fine boring rail train. The special clamp comprises a base, a supporting post, a positioning clamping plate and a tightening bolt; the upper end face of the positioning clamping plate is provided with a positioning seam allowance, a positioning plane and a tightening fixing hole; the positioning seam allowance is matched with a phi 465mm hole on a workpiece end face A; the tightening fixing hole corresponds to a mounting screw hole on a workpiece to be processed; the positioning clamping plate is fixed on the base through the supporting post; and the workpiece is fixed on the upper end face of the positioning clamping plate through the tightening bolt. The end face A, the phi 465mm hole on the face and a lateral surface B are adopted for positioning, and the workpiece is clamped by the tightening bolt 4, so the workpiece is positioned accurately and installed stably; axial tightening and fixing are performed by using a direct screwing mode of the tightening bolt and the existing screw hole on the workpiece, and the magnitude of the tightening force does not generate stress deformation in the radial direction of the processed pore series so as to ensure the dimensional precision and the form and position precision of the processed pore series.

Description

A special jig for the large hole system of the motor casing for fine boring rail trains Technical field: The invention relates to a box body boring jig, in particular to a special jig for fine boring large hole system of a motor housing used in rail trains. Background technique: The structure of the motor casing used in high-speed rail trains is shown in Figure 1 and Figure 2. This part is relatively large, and the middle hole system is a coaxial hole system with eight sizes. The coaxial hole system is from left to right. The diameters are ￠650mm, ￠531mm, ￠517.5mm, ￠517mm, ￠401.98mm, ￠421.06mm, ￠465mm and ￠650mm. The processing accuracy requirements are the highest, there are strict coaxiality requirements among the four, verticality requirements for the relative end face A and end face D, and full runout requirements for the surface of the inner hole. Among them, the hole diameter tolerance of the hole with a diameter of ￠531mm 0~0.034mm, the shape and position tolerance...

AI Technical Summary

Problems solved by technology

This group of coaxial hole systems are all thin-walled structures, and the dimensional accuracy and shape accuracy of the hole system are very high. At present, this high-precision workpiece is processed by a CNC machining center. ￠465mm hole and ￠650mm plane step, then take the ￠650mm plane on the end face A as the reference plane, and take the ￠650mm hole as the circumferential positioning reference, and use the side jaws to clamp along the radial direction of the hole system. The end face of the ￠650mm hole is a non-full plane, and the middle is a large hole of ￠465mm. During the clamping process, the workpiece installation, positioning and clamping are not stable. In response to force deformation, the dimensional accuracy and shape and position accuracy of the hole system are difficult to guarantee

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