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Method of Hydraulic Drawing Forming of Oil Pan without Draft Angle
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A technology of oil pan and draft angle, which is applied in forming tools, petroleum industry, manufacturing tools, etc. It can solve the problems of uneven material thickness, cracking, wrinkling, etc., and achieve the effect of solving slight friction and abrasion
Active Publication Date: 2018-11-30
湖北凸凹模具科技股份有限公司
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[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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[0019] Anti-extrusion medium, by mass percentage, consists of the following components: 30% mineral oil; 10% carboxylate; 10% boric acid or borate; 20% alkanolamine; 9% sodium petroleum sulfonate; 11 % Propylene Glycol Ether; 9% Nonionic Surfactant; 0.5% Defoamer; 0.5% Organic Sulfur Bactericide;
[0020] Mix the components uniformly to obtain the anti-extrusion medium.
Embodiment 2
[0022] Anti-extrusion medium for hydrodrawing of oil sumps without draft angles, consisting of the following components, by mass percentage: 31% mineral oil, 9% carboxylate, 8% boric acid or borate , 21% alkanolamine, 11% sodium petroleum sulfonate, 9% propylene glycol ether, 10% nonionic surfactant, 0.7% defoamer, 0.3% organic sulfur fungicide; Mix the components uniformly to obtain the anti-extrusion medium.
[0023] In the present invention, the carboxylate is selected from one of formate, acetate or oxalate; the sodium or potassium salt of formic acid, the sodium or potassium salt of acetic acid, the sodium of oxalate salt or potassium salt.
[0024] In the present invention, the borate is selected from one of sodium borohydride and ammonium hydrogen borate.
[0025] In the present invention, when boric acid or borate is selected, boric acid is preferred.
[0026] In the present invention, the alkanolamine is selected from one of N,N-diethylethanolamine, N,N-dimethyleth...
Embodiment 3
[0041] The method for hydraulic drawing and forming of oil pan without draft angle, the steps are as follows:
[0042] (1) Install the drawing forming die on the hydraulic drawing machine, inject the anti-extrusion medium of Example 1 on the top material plate in the cavity of the concave mold, to ensure that the top material plate is completely covered;
[0043] (2) Put a flat material on the cavity filled with medium, and apply conventional drawing oil on the punch;
[0044] (3) Mold closing: Start the hydraulic drawing machine to close the upper drawing mold and the lower drawing mold of the drawing mold;
[0045] (4) Material return: The formed engine oil pan exits the drawing forming die.
[0046] The effect of embodiment 3: through 500 product processings, pass rate is at 98%.
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Abstract
The invention provides a hydraulic drawing forming method for an oil pan without a draft angle. The method comprises the following steps: (1) arranging a drawing forming mold on a hydraulic drawing machine, injecting an anti-extrusion medium into a material jacking plate in a concave cavity and fully covering the material jacking plate, wherein the anti-extrusion medium is formed by mixing mineral oil, carboxylate, boric acid or borate, hydramine, petroleum sodium sulfonate, propylene glycol ether, non-ionic surfactant, de-foaming agent and bactericide; (2) putting a slab on the cavity filled with the medium and coating conventional drawing oil on a convex mold; (3) assembling a mold: starting the hydraulic drawing machine and assembling an upper drawing forming mold and a lower drawing forming mold of the drawing forming mold; and (4) quitting: quitting a formed engine oil pan from the drawing forming mold. According to the invention, the yield of the products can reach up to 98%; the parts are slightly scratched; the defects of material friction and uneven material thickness change of a cold stamping die mould can be overcome; the product is free from limiting fracture; the size meets the drawing requirement.
Description
technical field [0001] The invention belongs to the technical field of hydraulic drawing and forming, in particular to a method for hydraulic drawing and forming of an oil pan 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 and ensure the qualified rate, the present invention proposes a method for hydraulic drawing forming of the oil pan without draft angle. [0004] For this reason, the technical scheme o...
Claims
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