A punch craft is enclothed to improve outside

Hydraulic press parameter adjusts the hydraulic press when maintaining punch to produce advocate crock pressure and dwell time are changeless, adjust hydraulic pressure to fill up force, if pursue,2 are shown. Pass the adjustment of pair of spot parameter, the hydraulic pressure when actual production mat pressure setting is 5MPa, the 3 ～ 4MPa that craft of summary prep above asks, exceeded craft range, but will look from the result, the intensity of the spare parts and tigidity did not get ameliorative, the set that shows hydraulic press parameter is not the main reason that causes spare parts surface to cave. Graph 2 adjust hydraulic press parameter (unit: MPa) 2.

Analysis of material figuration principle wraps shell plating semifinished product in one Zhang Fa motive use on makings delimit the needle delimits span 100mm warp, woof, be out of shape as a result of intermediate plasticity is not apparent, span 10mm is underlined among. Delay processing through undertaking pulling to this plank, we discover, the reseau line of span 100mm is passed all around pull drawing of the generation after delaying, bulging, achieve span 103mm, and the reseau line of intermediate span 10mm is pulled 10mm still is after delaying, basically do not have the process of drawing, bulging, did not form plasticity metabolic effect. So, we conclude: Want to solve problem of intermediate cave in, must make partial generation plasticity is out of shape among material, increase the tigidity of material and strength thereby. Accordingly, our decision is particular rectifying and reform a method is: The plasticity that realizes material is out of shape have to nap mould, the change is pulled delay a model to help the structure that delay muscle, take makings rate in order to control, form interior to go makings be more than periphery, make intermediate material produces bulging, increase tigidity of surface of engine cover shell plating. Craft improves plan 1.

Pull the structure that delay muscle delay muscle to be enclothed in the car draw the position with in delaying figuration, be had very significant. Because be in,this is pull in extending figuration process, the figuration of semifinished product needs certain size and the pulling force that distributings appropriately along periphery, of semifinished product of part of the active force that this kind of pulling force comes from punch equipment, flange be out of shape fight force and the active force that control makings aspect. The attrition power that the active force that controls makings aspect leans between the mould below effect of the strength that approach a limit and material only often is insufficient, need is in those who press the setting on makings face to be able to produce very great resistance to pull extend the requirement that muscle is out of shape with satisfying semifinished product plasticity and plasticity flows. In the meantime, use pull delay muscle to be able to be out of shape in the control in bigger range of division semifinished product be out of shape size is mixed be out of shape distributing, restrain burst, corrugate the generation that waits for a variety of punch quality problems with exterior distortion. Can say, below a lot of circumstances, pull delay muscle whether reasonable setting is board gold one of crucial factors of strike out result. Round muscle is used at material to flow into when the amount is large pull delay, long standard is light, facilitate adjust help the resistance that delays muscle. Rectangular muscle is used at material to flow into when the quantity is little pull delay or bulging, with round muscle photograph comparing can provide more powerful add pulling force. According to these reasons, decide on the structure we choose to replace round veins that stand out under the skin with rectangular muscle (graph 3) , in pressure parameter stable circumstance falls, increase into material resistance. Pull delay an intermediate position to produce plasticity to be out of shape, increase strength. Graph 3 moulds change around to draw sketch map of the section plane that delay muscle 2.

Pull delay muscle to decorate pull the position that delays muscle to must delay an appearance characteristic according to pulling, pull delay the case such as deepness and data flow characteristic and calm. Differ according to what wanting achieved goal, pull those who delay muscle to decorate different also: (1) the curvature change that considers the outline inside sunken model of engine cover shell plating is not big, compare point-blank much, have local area only (4 horn) the requirement receives makings rate faster, the edge is so sunken modular mouth all around the setting is pulled continuously delay muscle. (2) press makings face to go up to adjust difference of metabolic of each place material, ensure material is compared to the speed of the flow inside sunken model even, mouth of edge sunken model all around the setting is pulled discontinuously delay muscle, the place that bend horn is not set. Hind (arc) add to pull delay muscle (double rectangular muscle) , in hydraulic press pressure stable circumstance falls, increased resistance, reduce material to flow into a quantity, intermediate place produces plasticity to be out of shape, enhanced workpiece tigidity. 3.

Material increases material breadth, increase 1445mm from 1420mm, made formation is in-house go makings be more than periphery, make intermediate material produces take up, improve drawing result, raise hardness of surface of engine cover shell plating. After long model is finished, pass the adjustment of parameter of pair of spot hydraulic press, hydraulic pressure mat pressure sets stability to be in 5MPa, undertake reseau experiment test and verify again, discovery is pulled extend a reseau line intermediate drawing 2mm, intermediate place produced plasticity to be out of shape (graph 4) , intensity rose. Graph 4 pull extend a reseau line intermediate drawing 2mm, increased strength visual detect and hardness detects, surface of engine cover shell plating is nonexistent cave in problem, intensity of engine cover shell plating, tigidity rises apparently. Technical personnel is odd to rectifying and reform the engine cover shell plating after after installing electrophoresis via besmear, undertake spot effect test and verify, achieve expect the result. Besmear corrective processing will need no longer before outfit, rectify and reform the effect remarkable. CNC Milling