Anti-extrusion medium for hydraulic drawing forming of draft angle-free oil pan

Abstract

The invention provides an anti-extrusion medium for hydraulic drawing forming of a draft angle-free oil pan. The anti-extrusion medium is prepared from the following components in percentage by mass: 29 to 31 percent of mineral oil, 9 to 11 percent of carboxylate, 8 to 12 percent of boric acid or borate, 19 to 21 percent of alkyl alcohol amine, 9 to 11 percent of petroleum sodium sulfonate, 9 to 11 percent of propylene glycol ether, 8 to 10 percent of nonionic surfactant, 0.3 to 0.7 percent of defoamer and 0.3 to 0.7 percent of organosulfureous fungicide. The anti-extrusion medium is applied to a die cavity in hydraulic drawing forming of the draft angle-free oil pan to replace existing drawing oil, and drawing forming of the draft angle-free oil pan is realized in the same drawing die; the product yield reaches 98 percent, parts are slightly scratched, the defects that a cold stamping die rubs a material unevenly, and the thickness change of the material is uneven are overcome, limit cracking is avoided, and the size meets the drawing requirements.

Description

technical field [0001] The invention belongs to the technical field of hydraulic drawing forming, in particular to an anti-extrusion medium used for hydraulic drawing forming of an oil sump without a draft angle. Background technique [0002] For turbocharged engine oil pans, there are some product types that are draft-free oil pans, such as figure 1 As shown, if the side wall A has no draft angle, it cannot be stamped and formed by the conventional drawing method, and the purpose cannot be achieved by applying ordinary drawing oil on the surface of the convex die and the cavity of the concave mold of the drawing die. Wrinkles and cracks are serious, and the thickness of the material is uneven. Contents of the invention [0003] In order to realize the drawing forming of the oil pan without draft angle, the present invention proposes an anti-extrusion medium for hydraulic drawing forming of the oil pan without draft angle. [0004] For this reason, the technical solution...

AI Technical Summary

Problems solved by technology

[0002] For turbocharged engine oil pans, there are some product types that are draft-free oil pans, such as figure 1 As shown, if the side wall A has no draft angle, it cannot be stamped and formed by the conventional drawing method, and the purpose cannot be achieved by applying ordinary drawing oil on the surface of the convex die and the cavity of the concave mold of the drawing die. Severe wrinkling and cracking, uneven material thickness

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