Process forming method for observation hole of fuel tank parts
A technology of observation holes and parts, which is applied in the field of process forming of observation holes of fuel tank parts, to achieve the effects of improving quality, reducing product scrap rate, and saving production costs
Active Publication Date: 2017-09-15
HARBIN
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Problems solved by technology
[0004] This method better combines the two methods of stretching and internal spinning, and formulates more reasonable internal spinning process parameters, and solves the forming problem of the observation hole of the fuel tank parts.
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Embodiment Construction
[0025] A process forming method for an observation hole of an oil tank part, the method comprising the following steps:
[0026] (1) Make positioning holes:
[0027] Drill a Φ4mm positioning hole in the center of the observation hole on the L4M TH1.0 aluminum cylinder; the Φ4mm positioning hole has the following two functions: first, it can prevent cracks at the flange fillet during the formation of the observation hole, and more It is beneficial to the flow of materials. Second, it is used as a positioning hole for the subsequent spinning process.
[0028] (2) Stretch forming: Use a special stretching die to partially stretch the aluminum cylinder on a punching machine, and take the center of the Φ4mm positioning hole as the center to stretch out a circular boss with a diameter of Φ40mm and a height of 5mm;
[0029] The stretching height should not be too high, as the stretching height is too high, which will cause cracks in the part at the flange fillet.
[0030] (3) Compl...
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The invention belongs to the technical field of forming processes of complicated metal-plate components, and relates to a forming process method of a fuel tank component viewing hole. In the forming process method, a component is stretched for preforming at first and then the component is internally spun twice, so that ductility of the component is fully played. The forming process method comprises the following steps: (1) machining a positioning hole; (2) stretching forming; (3) completely annealing: completely annealing an aluminum cylinder; (4) machining a blank hole before internally spinning, and sanding a section; (5) internally spinning; (6) flaring; (8) forming internal ribs. By the forming process method, defects of rupture, slip lines, coarse grains, orange peels, wrinkling and the like around a viewing hole in the original forming process are avoided, the quality of the component is improved, product scrappage is reduced and the production cost is lowered; the scrappage of the components due to the forming defects is reduced from original 30% to 5%.
Description
technical field [0001] The invention belongs to the category of forming process of sheet metal complex parts, and relates to a process forming method for an observation hole of an oil tank part. Background technique [0002] For most cylindrical fuel tank parts, it is necessary to add observation holes on the cylinder wall. For the existing L4M TH1.0 aluminum fuel tank parts, the inspection hole is generally formed by stretching, and some parts use this method. Limited by the ultimate elongation of the material itself, it cannot be formed. Even if such parts can be formed by multiple stretching methods, there are problems of high forming cost and low success rate, and there may be cracks around the observation hole. , slip lines, coarse grains, "orange peel", wrinkling and other forming defects. In addition, most fuel tank parts are designed with inner end frames and inner ribs. These parts make their forming more difficult and are also What cannot be realized by traditiona...
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IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 王安良黑东盛
Owner HARBIN