CN109402362B

CN109402362B - Method for correcting deformation of fluke

Info

Publication number: CN109402362B
Application number: CN201811406687.3A
Authority: CN
Inventors: 朱峰; 余全; 蔡常林; 金志宏; 徐钢
Original assignee: Cssc Marine Power Components Co ltd; Hudong Heavy Machinery Co Ltd
Current assignee: Cssc Marine Power Components Co ltd; Hudong Heavy Machinery Co Ltd
Priority date: 2018-11-21
Filing date: 2018-11-21
Publication date: 2020-10-02
Anticipated expiration: 2038-11-21
Also published as: CN109402362A

Abstract

The invention discloses a method for correcting the deformation of a fluke, which comprises the following steps: confirming a deformation part and measuring the deformation amount; the anchor is laid horizontally and charged, and a plurality of cushion blocks are prepared for each anchor fluke; a plurality of points are tamped at the part of the fluke without deformation to prevent deformation, cushion blocks are placed at the corresponding parts of the deformed fluke, and the height of the cushion blocks at the corresponding parts of the two flukes is the same; placing a heat-resistant heavy object on the deformed anchor fluke, wherein the gravity center stress point of the heat-resistant heavy object is required to be right above the cushion block; and (3) carrying out 900 ℃ normalizing treatment, wherein the heating rate is not more than 150 ℃/h, the heat preservation time is not less than 5 h, and after the material is discharged from the furnace, the deformed part can automatically recover to the original position. The invention has the beneficial effects that: the method has the advantages that the method replaces local fire attack electric welding finishing, eliminates local residual stress generated by welding/fire attack, and improves the structure stability of the casting; meanwhile, an integral correction method is applied, replacement of a new anchor is omitted, and cost is reduced.

Description

Method for correcting deformation of fluke

Technical Field

The invention belongs to the technical field of anchor mooring equipment processing, and particularly relates to a method for correcting fluke deformation.

Background

The ship anchor, usually made of cast steel, is the main part of anchoring equipment, and its function is mainly to insert into the sea bottom by the gravity of anchor and anchor chain, so as to achieve the purpose of fixing and stabilizing the ship. However, in the process of anchoring operation, due to the abnormal and complicated seabed conditions (seabed rocks, etc.), or due to the misoperation of personnel, the situations of uneven holding force and unilateral stress generated by the two anchor heads can occur. If the damage is light, the damage is damaged, and if the damage exceeds the yield strength critical point of the material, the bending deformation is generated, and the safety of the ship is seriously influenced. The method mainly adopts a local fire-attacking electric welding finishing mode aiming at the deformed and bent anchor fluke at present, but the anchor fluke has certain stress after being corrected by the method and is not eliminated, so that the fatigue resistance of the material can be reduced, and the potential safety hazard of fracture is caused in the subsequent use; the replacement of the fluke is adopted, and the production cost is undoubtedly increased.

At present, no explanation or report of the similar technology of the invention is found, and similar data at home and abroad are not collected.

Disclosure of Invention

In view of the above-mentioned shortcomings of the prior art, it is an object of the present invention to provide a method for correcting fluke deformation, which solves the above-mentioned problems of the prior art.

In order to achieve the purpose, the invention adopts the following technical scheme:

applying external force of a heavy object by using an integral heat treatment mode to ensure that the fluke is deformed and reset in the slow heating process, and comprising the following steps:

step S1, confirming the deformed fluke and the deformed part of the deformed fluke;

step S2, correcting in an integral heat treatment mode, loading the anchor in a furnace in a flat manner, and preparing a plurality of cushion blocks for each anchor fluke;

step S3, adopting a cushion block to cushion a plurality of points at the non-deformed fluke to prevent deformation, placing corresponding cushion blocks at the corresponding parts of the deformed fluke, wherein the heights of the cushion blocks placed at the corresponding parts of the non-deformed fluke and the deformed fluke are the same;

step S4, placing a heat-resistant heavy object on the deformed fluke, wherein the gravity center stress point of the heat-resistant heavy object is right above the cushion block;

and step S5, carrying out 900 ℃ normalizing treatment, wherein the heating rate is not more than 150 ℃/h, the heat preservation time is not less than 5 h, and after the material is discharged, the deformed part automatically restores to the original position.

Preferably, the step S1 includes the following steps:

step S11, vertically placing the anchor on the ground;

in step S12, the deformed fluke and its deformed portion are confirmed by side observation, and the amount of deformation L is measured.

Preferably, in the step S4, a heat-resistant weight is placed on the deformed portion of the deformed fluke.

Preferably, the number of the cushion blocks is 2-3.

Preferably, the weight of the heat-resistant weight is 50 to 500 kg.

Compared with the prior art, the invention has the following beneficial effects:

the correction method for fluke deformation provided by the invention replaces local fire attack electric welding finishing, eliminates local residual stress generated by welding/fire attack, and improves the structural stability of a casting; meanwhile, an integral correction method is applied, replacement of a new anchor is omitted, and cost is reduced.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:

fig. 1 is a schematic view showing the anchor placed vertically, wherein (a) is a side view and (b) is a front view.

Fig. 2 is a schematic view of the straightening and placing of the fluke.

In the figure: 1 is an anchor fluke, 2 is a heat-resistant heavy object, and 3 is a cushion block.

Detailed Description

The following examples illustrate the invention in detail: the embodiment is implemented on the premise of the technical scheme of the invention, and a detailed implementation mode and a specific operation process are given. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.

Examples

Referring to fig. 1 (a) and (b) to fig. 2, in an embodiment of the present invention, a method for correcting fluke deformation is provided, which applies an external force of a heavy object in an integral heat treatment manner to deform and reset deformed fluke 1 during a slow heating process.

The specific operation process of the embodiment includes the following steps:

step 11, vertically placing the anchor on the ground;

step 12, observing from the side to confirm the deformed fluke and the deformed part of the deformed fluke, and measuring the deformation L;

step 2, correcting by adopting integral heat treatment, loading the anchor in a furnace in a flat manner, and preparing 2-3 cushion blocks 3 at each anchor head according to the size of the fluke 1;

step 3, tamping 2-3 points at the part of the fluke without deformation to prevent deformation, placing a cushion block 3 at the deformed part of the fluke at the other side corresponding to the two flukes, wherein the height of the cushion blocks at the corresponding parts of the two flukes is the same;

step 4, placing more than 50-500 kg (according to the size of the fluke 1) of heat-resistant heavy object 2 on the deformed fluke, wherein the gravity center stress point of the heat-resistant heavy object 2 is required to be right above the cushion block 3;

and 5, normalizing at about 900 ℃, wherein the heating rate is not more than 150 ℃/h, the heat preservation time is not less than 5 h, and the deformed part can automatically recover the original position after being discharged.

The correction method for fluke deformation provided by the embodiment of the invention replaces local fire attack electric welding finishing, eliminates local residual stress generated by welding/fire attack, and improves the structural stability of a casting; meanwhile, an integral correction method is applied, replacement of a new anchor is omitted, and cost is reduced.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. A method for correcting the deformation of an anchor fluke is characterized in that a mode of integral heat treatment is applied, and a heavy external force is applied to enable the anchor fluke to deform and reset in a slow heating process, and comprises the following steps:

step S1, confirming the deformed fluke and the deformed part of the deformed fluke; the method comprises the following steps:

step S11, vertically placing the anchor on the ground;

step S12, observing and confirming the deformation fluke and the deformation part thereof from the side surface, and measuring the deformation L;

step S4, placing a heat-resistant heavy object on the deformation part of the deformation fluke, wherein the gravity center stress point of the heat-resistant heavy object is right above the cushion block;

step S5, carrying out 900 ℃ normalizing treatment, wherein the heating rate is not more than 150 ℃/h, the heat preservation time is not less than 5 h, and after the material is discharged, the deformed part automatically restores to the original position;

the number of the cushion blocks is 2-3;

the weight of the heat-resistant heavy object is 50-500 kg.