Machining method of split sleeve

Abstract

The invention relates to the technical field of improvement of the strength of aircraft or high-speed locomotive structural fastener connecting holes and specifically relates to a method for intensifying the strength of an aircraft or high-speed locomotive structural fastener connecting hole in an extruding mode, in particular to a machining method of a split sleeve. The method comprises the following steps that raw materials are selected according to specification requirements of the required stainless steel split sleeve, wherein the raw materials are hard stainless steel plates which are subjected to no heat treatment when leave a factory; and the raw materials are subjected to annealing heat treatment and then subjected to rolling depression and leveled on a roller press according to needs, the thickness is adjusted, and after calculation and blank layout are completed, the raw materials are cut into bar-shaped to-be-machined raw materials. According to the machining method of the split sleeve, heat treatment is adopted for the excessively thicker stainless steel plates subjected to no heat treatment, firstly the thickness is adjusted, then punching blanking and bending and rounding linkage forming reinforcing are performed, and the problem that high-strength stainless steel sheets are difficult to form is solved in the mode that the thickness of the stainless steel plates subjected to heat treatment is adjusted firstly, and then punching blanking and bending and rounding linkage forming reinforcing are performed.

Description

technical field [0001] The invention relates to a technical field capable of improving the strength of connecting holes of structural fasteners of aircraft or high-speed locomotives, in particular to the use of bush extrusion to strengthen the strength of connecting holes of structural fasteners of aircraft or high-speed locomotives, and in particular to a slotted bushing processing method. Background technique [0002] At present, some people in China are trying to localize the stainless steel slotted bushing for cold extrusion hole strengthening, but they have not succeeded. In addition to the reasons that there are more than 400 kinds of stainless steel slotted bushes in metric and imperial specifications and the diameter and length are too small to be processed, it is also because there is no real understanding of the cold extrusion process principle and strict technical requirements. For example, cold extrusion is in a serious process. under profit conditions. It is r...

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Problems solved by technology

[0005] 2. In addition, the cold extrusion specification stipulates that the required material thickness of the stainless steel slotted bushing plate will be different from the factory state and thickness of the plate purchased in the actual market;

[0006] 3. It is not clear that the cold extrusion strengthening process specification requires that the coating thickness should not exceed 0.015mm, the adhesion is strong, and it cannot fall off during extrusion, etc.

[0007] 4. There is no arrangement for heat treatment of stainless steel plates that have not been heat-treated before leaving the factory, and there is no need to arrange a process for adjusting the thickness; there is no arrangement for the process of increasing the strength of the slotted bush after forming; and there is no arrangement for improving the adhesion of the coated dry film lubricant In addition to pickling the board, sandblasting, cleaning with pure water, surface treatment of the coated board, and drying and curing of the dry film lubricant are required; the dry film lubricant is applied after simple cleaning or pickling

Therefore, the adhesion performance of the dry film lubricant is also poor, and the dry film lubricant falls off when squeezed

[0008] 5. The second is to adopt simple sheet metal forming process, adopt multiple stamping, bending, or adopt three-roll rolling process, which is difficult to succeed, and other reasons have made it impossible to achieve localization so far

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