Scribing method for rear stern shaft bracket steel casting

Abstract

The invention discloses a scribing method for a rear stern shaft bracket steel casting. The scribing method comprises the following steps that S1, lofting is conducted, specifically, a plane lofting drawing of a rear stern shaft bracket is compiled; S2, leveling is conducted, specifically, the rear stern shaft bracket is hoisted to a scribing platform and corrected to be horizontally placed; S3, center line scribing is conducted, specifically, center lines of a shaft hole, an arm and a center plate are scribed on the rear stern shaft bracket according to the plane size annotated by the plane lofting drawing; S4, clamping plate manufacturing is conducted, specifically, clamping plates consistent with the shaft hole, the arm and the center plate of the rear stern shaft bracket in actual shape and size are manufactured according to the plane lofting drawing; and S5, scribing is conducted, specifically, the clamping plates are checked according to the center lines on the rear stern shaft bracket, and the parts which do not meet the size are determined through a scribing needle. According to the scribing method, the plane lofting drawing is compiled to assist in positioning the center lines of the shaft hole, the arm and the center plate, the clamping plates are manufactured to assist in scribing, scribing of the rear stern shaft bracket steel casting is achieved, and the size precision of the rear stern shaft bracket is ensured.

Description

technical field [0001] The invention relates to the technical field of steel casting manufacturing, in particular to a marking method for a rear stern shaft frame steel casting. Background technique [0002] The rear stern shaft frame is an important part of the ship's power transmission system. During the sailing process of the ship, the stern shaft frame will be subjected to strong impact and oscillation forces caused by the rotation of the propeller. The rear stern shaft frame is also called the double arm frame and the herringbone frame, which is a herringbone structure (see Figure 1 to Figure 3 ), one end is a shaft hole 1, and there are double arms 2 connected to the shaft hole 1. The other end of the arm 2 is a web 3, and there are multiple rib structures 4 on the web 3. Here, the web 3 and the ribs will be connected with the ship The connection of the bottom plate is streamlined and complex in shape and structure. Both the shaft hole 1 and the double arm 2 have angl...

AI Technical Summary

Problems solved by technology

The shaft hole 1 and the size of the rib plate are easy to check, but it is difficult to carry out detailed size checks for the streamlined width plate 3 and the double arm 2 with multiple angles, and the size deviation of the above parts will cause problems in the subsequent process

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