Large-sized high-strength alloy steel lifting hook forge piece and machining method

Abstract

The invention relates to a large-sized high-strength alloy steel lifting hook forge piece and a manufacturing machining method, and the large-sized high-strength alloy steel lifting hook forge piece adopts a three-dimensional model to analyze and numerical control machine the working allowance of a four-claw hook with the overall height being 2840 mm, the hook body being 2030 mm, the net weight being 7.7 t, the unit lifting tonnage being 4500 t; and the upper end of a hook neck of the four-claw hook is a thread and the thread portion is rotatably connected with a hook beam, and bending portionof the lower portion of the four-claw hook is the hook body and the section of a fishing body is in a circular arc shape. The large-sized high-strength alloy steel lifting hook forge piece has the advantages that 1, the surface quality of the forge piece and ultrasonic flaw detection are required to meet a CCS classification society requirement; 2, accurate and effective residuals removing and measurement are easily achieved during machining, and defect that clamping and positioning deviation cannot meet drawing related requirements is avoided; and 3, the quality of hook surface profile machining is ensured.

Description

technical field [0001] The invention relates to a large-scale high-strength alloy steel hook with a total height of 2840mm, a hook body width of 2030mm, a net weight of 7.7t, and a unit lifting tonnage of 4500t for analysis of the machining allowance of the four-claw hook by three-dimensional modeling, and CNC machining. The processing method belongs to the field of hook manufacturing. Background technique [0002] 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 1600mmx1600mm, and the forging blank weight reaches 27.5t. Therefore, the machining allowance from the ...

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

Secondly, the complex structure of the workpiece is difficult to form, process and measure the hook body. The existing technology adopts the method of flame gas cutting and grinding. This process has many problems. Inclined, uneven force during lifting work will increase the abnormal wear of the nut and the hook beam, and it is difficult to effectively remove all the edges and corners in the hook cavity by traditional manual grinding, which will affect the appearance and aggravate the wear of the wire rope, posing a safety hazard

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