A thin square plate forging method

Abstract

The invention discloses a thin square plate forging method. The method comprises the following steps: (a) forging a blank to form a round blank, sequentially performing upsetting and drawing, punching, reaming and finishing to obtain a fitting sleeve, and controlling the size of the fitting sleeve according to the net size and the margin of 2 to 4 thin square plates forged by a pre-fitted part; (b) marking and sawing off the fitting sleeve to form 2 to 4 arc plate blanks according to the net length and the length margin of every thin square plate; and (c) heating the arc-shaped plate blanks ata low temperature, and performing rolling to obtain a thin square plate. The method sequentially adopts fitting sleeve forging and division finishing, so the sleeve is not prone to be folded during flattening, and folding of thin square plate formed by direct forging is effectively avoided; and the thin square plate is obtained through rolling, so the length and width round heads can be almost neglected, so the size control margin of forging is great, and control is easy, thereby the forging margin is greatly reduced, the forging heating number is reduced, the processing period is shortened,and the processing efficiency is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of square plate processing, and in particular relates to a thin square plate forging method. Background technique [0002] At present, the square plate forging process includes: forging the billet into a square billet→drawing length→rolling width→drawing length→rolling width→thickness and width finishing forming. For the forging of thin square plates (thickness ≤ 150mm, width ≥ 1700mm), the most important feature is not the difficulty of forging, but the following problems in the forging process: [0003] 1. Because the thickness is very thin, the width and length are very long compared to the thickness, so that the final molding cannot be turned over to flatten the width, and the flat-length round head cannot be erected (ratio of length to thickness and ratio of width to thickness) If it is too large, when the length and width are flattened, the force cannot be transmitted to the center of the forging, and...

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Problems solved by technology

[0003] 1. Because the thickness is very thin, the width and length are very long compared to the thickness, so that the final molding cannot be turned over to flatten the width, and the flat-length round head cannot be erected (ratio of length to thickness and ratio of width to thickness) If it is too large, when the length and width are flattened, the force cannot be transmitted to the center of the forging, and the center deformation cannot be caused. During the flattening process, the deformation is only on the surface, and the center does not move. The final flattening result is a local small deformation, and the thin square plate is easy to bend );

[0004] 2. Due to the thin thickness, the cooling speed of the forging is very fast after the last few forgings are forged at high temperature, and the forging time of the entire forging is very short, resulting in the need for more firings in the entire forging process, and the energy consumption also increases accordingly;

[0005] 3. During the forging process, after the square plate is rolled wide, both ends of the length direction will form arcs, such as upsetting will cause the square plate to bend, so it can no longer be upset, and additional arcs at both ends must be added to the process allowance. More than expected

And when the forming length is finally extended, the manipulator needs to clamp the thickness of the forging and push the billet. Since the thickness of the forging is very thin, during the clamping and turning process of the manipulator, there will be a clamping mark of about 15mm on one side in the thickness direction. For this situation We can only increase the thickness allowance of the forging to ensure the machining allowance of the product

[0006] In summary, in the forging process of thin square plates, there are technical problems such as difficult leveling, large blank allowance, and many forging fires, which lead to high forging costs.

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