A Milling Fixture for Right Angle Fishplate

Abstract

The invention relates to the technical field of tower crane manufacturing, and discloses a milling clamp for a right-angle splice bar. The milling clamp comprises a dividing head and a connecting plate, wherein the connecting plate is arranged on a dividing head main shaft and can rotate with the indexing head main shaft for indexing. The axis of the indexing head main shaft is horizontally arranged. Angle steel used for positioning two outer right-angle surfaces at the front end of the right-angle splice bar is arranged on the connecting plate. Two inner side surfaces of the angle steel are used as the positioning surfaces of the two outer right-angle surfaces at the front end of the right-angle splice bar and are parallel to the axis of the indexing head main shaft. Supporting plates arearranged across two side edges of the angle steel. The supporting plates are provided with propping elements for propping the right-angle splice bar to the positioning surfaces. By means of the milling clamp, the clamping and machining efficiency, the machining precision and the product quality are improved.

Description

technical field [0001] The invention relates to the technical field of tower crane manufacturing, in particular to a milling fixture for a right-angle fishplate. Background technique [0002] Such as Figure 4 The right-angle fishplate is an important connecting piece in the metal structure of the tower crane. The blank of the right-angle fishplate is usually a casting or forging, which includes a front part and a tail part, wherein the inner and outer right-angle surfaces of the front part are unprocessed blank surfaces, and the inner right-angle surfaces of the tail part are unprocessed blank surfaces , the outer right-angle surface of the tail end is the processing surface, and it is necessary to ensure that the two outer right-angle surfaces of the tail end of the right-angle fishplate are perpendicular to each other. In addition, the two outer right-angle surfaces of the front end of the right-angle fishplate are also processed with pin holes for connection, and the co...

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned conventional processing methods have the following problems: First, it is easy to cause a large relative position error between the two outer right-angle surfaces at the rear end of the right-angle fishplate and the two outer right-angle surfaces (blank surfaces) at the front end after processing, thereby affecting the appearance and installation. The accuracy of the connection; the second is that the machining allowance of the two outer right-angle surfaces at the end of the right-angle fishplate is prone to be uneven, and the wall thickness difference after processing is large, resulting in asymmetric shape and affecting its appearance quality; There will be a certain clamping error in the secondary clamping, and the workpiece needs to be aligned during the clamping process. The operation is time-consuming. On the one hand, it affects the machining accuracy, and on the other hand, it leads to a decrease in processing efficiency.

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