Machining process method of large forge piece lifting hook

Abstract

The invention provides a machining process method of a large forge piece lifting hook. The machining process method comprises the following steps of 1, material selecting and blanking, 2, forging, 3,normalizing and high temperature tempering, 4, shell making, 5, thermal refining, 6, load testing, and 7, comprehensive inspecting and flaw detecting after load testing. The forge piece lifting hook prepared by the process can meet the overall load capacity and the internal quality of the lifting hook.

Description

technical field [0001] The invention relates to the field of aviation investment casting, in particular to a processing method for a large forging hook. Background technique [0002] The hook is one of the most common hoisting machinery spreaders, which is suspended on the wire rope of the hoisting mechanism by means of a pulley block. There are two types of hooks: single hook and double hook. The single hook is easy to manufacture, and the load that can be lifted is generally less than 80 tons. [0003] The development of large-scale high-strength alloy steel hook products is a large-scale lifting hook used in offshore engineering ships (such as large crane ships, pipe-laying ships, dredgers, large shipyard gantry cranes and drilling platforms, etc.), with a total height of 2840mm , The width of the hook body is 2030mm, the net weight is 7.7t, and the lifting tonnage of the unit is 4500t. It is used to make hook forgings with a hook body width and thickness of 1600mmx1600...

AI Technical Summary

Problems solved by technology

Therefore, the machining allowance from the forging blank to the finished product is very large, and it is difficult to quickly remove the machining allowance by turning and milling alone. Moreover, due to the deep concave surface of the hook cavity, there will be tool interference and insufficient overhang length of the tool bar in traditional milling, because The maximum required extension length from the hook tip to the hook cavity is 800mm, which will affect the machining accuracy and surface quality due to the poor rigidity of the tool holder during machining

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