Integral manufacturing method for tube section of large storage box based on numerical control mirror milling

Abstract

The invention provides an integral manufacturing method for the tube section of a large storage box based on numerical control mirror milling. The method comprises the following steps: (1) milling the upper faces and the lower faces of wall boards of the storage box in a flat board mechanical milling mode through a numerical control wall board milling machine; (2) bending and forming the wall boards through a filling rolling and bending forming method; (3) welding the bent and formed wall boards into the tube section through friction stir welding; (4) carrying out mechanical milling on the tube section integrally, and gridding of the wall boards forming the tube section is machined through numerical control mirror milling. The tube section integral mirror milling is adopted in the integral manufacturing method to replace traditional chemical milling, flat plate mechanical milling and the single curve wall board numerical control gridding milling technology, the manufacturing method of the tube section of the gridding storage box that first a tube is formed and then the tube is milled is achieved, the demand is met, and the machining precision and the machining efficiency of the tube section of the storage box are improved.

Description

technical field [0001] The invention relates to a mechanical manufacturing process method, in particular to an overall manufacturing method of a large tank barrel section based on numerical control mirror milling. Background technique [0002] The storage tank is an important part of the launch vehicle, which needs to withstand the internal pressure of the fuel, axial pressure, twisting resistance and overload shock during flight, and is used in a harsh environment. It has the characteristics of thin wall, weak rigidity, and no machining allowance in one-time molding. [0003] The barrel section of the storage tank mainly adopts wall plate rolling bending, chemical milling grid, and welding into barrel. However, traditional chemical milling solutions, such as figure 1 As shown, the existing problems: (1) For the traditional chemical milling process, it is difficult to control the chemical corrosion rate, and it is easy to cause over-corrosion or uneven corrosion, which wil...

AI Technical Summary

Problems solved by technology

However, traditional chemical milling solutions, such as figure 1 As shown, the existing problems: (1) For the traditional chemical milling process, it is difficult to control the chemical corrosion rate, and it is easy to cause over-corrosion or uneven corrosion, which will either cause pitting pits or thin corrosion parts on the wall, or The corrosion of the wall plate is not in place, resulting in comprehensive over-correction, low machining accuracy, and difficult to control the remaining wall thickness tolerance

(2) The traditional chemical milling process must require fillet transition, and the transition fillet R is large, resulting in excessive waste weight, and the wall thickness is delivered in excess of positive tolerance, which greatly increases the overall weight of the storage tank and seriously affects Siding weight

It is not conducive to the weight loss of the arrow body

(3) The chemical milling process will cause a large amount of waste liquid discharge, and the use of a large amount of organic glue will bring about organic waste that is harmful to the environment, serious waste of energy, and great pressure on environmental pollution

[0004] The storage tank section can also adopt the plan of the plate number milling grid wall panel, such as figure 2 As shown, the existing problems: (1) There is a tolerance between the actual profile and the theoretical profile after the plate is bent, and the shape and position errors of each part are inconsistent, and there is a difference between the same plate or wall thickness after the plate is formed, and the difference is between The range of 0.2-0.5mm is different, and the distribution position is different

Can not meet the design accuracy requirement of wall thickness ±0.1

(2) For wall panels with sudden changes such as bosses in the grid area, the rigidity in the bending part is too high or too weak, resulting in uneven deformation or insufficient local deformation, and cracks are prone to occur at the edge of the bosses.

(3) The processing efficiency is low, which is far from meeting the model requirements

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