Curve flash of Dui forge crankshaft to be reached to the adverse effect of figuration eliminate a method

[summary] the article introduced large crankshaft to curve the flash in Dui forge production to be opposite the influence of figuration of crankshaft Dui forge, the measure that removes adverse effect according to practical experience offset undertook discussing. Current, of crankshaft curve Dui forge technology to basically have two kinds of methods: RR law (1) seeing a picture and TR law (2) seeing a picture. The tool that the different point of these two kinds of methods basically depends on using passes force orgnaization to differ: RR law is to use tool wide strength of Dui of level of translate into of pressure of equipment of oblique plane general, and TR law is to use ancon wide strength of Dui of level of translate into of pressure of lever general equipment. But no matter be which kinds of method, when march abduct figuration, all be perpendicular curve arm of music of thick figuration of bad turn and horizontal Dui two direction metabolic is united in wedlock, be a kind many to die forging technology. Like be the same as craft of other die forging, in curving process of Dui forge figuration, dividing modular face place to also can form flash individually, the flash that forms with music arm flank among them is bigger to figuration influence. Program of different music arm figuration, having bigger effect to whether producing flash. To the figuration of music connecting lever, different manufacturer is having different design. Some forginging the external form of crankshaft music arm that the factory produces is free figuration (3) seeing a picture, control the width of bad turn quantity and music abduct only, amount of treatment of the side outside music arm is larger, dimension is not stable; Some forginging the factory uses a mould to control music arm appearance (4) seeing a picture, mental allowance of music arm outboard is evener, dimension is stabler, but the effect that differ as a result of appearance of product music arm or suffers other factor, can appear sometimes flash. 1. Flash is right the affects plan of music arm figuration choice that curves figuration of Dui forge crankshaft besides right machine mental allowance is influential outside, also have bigger effect to the figuration function of whole music abduct. Use free figuration technology, can arise to be out of shape lesserly fight force, make sure music abduct width can be pressed adequately lean. And the method that uses arm of mould figuration music, as a result of the metal be out of shape flow can get model of antrum restrict and generation is larger be out of shape fight force, and as a result of music arm each place metal is out of shape the situation is different, in some place can form flash, like be the same as die forging figuration, the occurrence meeting of flash increases deformation force, if fight force bigger, exceed facility work capacity, can cause be issued to lower levels of compressor slide block not to reach the designated position, the mould fails to combine a model completely, forging can appear music abduct ply is bigger, curve bad turn to be less than a neck that reach abduct to owe the circumstance that lean. My company produces 270 crankshaft in the trial-produce on 4000t hydraulic press when, because form bigger flash, horizontal Dui is thick do not reach the designated position, music abduct became thick 7mm, bad turn amount became small 4mm. In addition, in producing a course, we pass the deformation force of the crankshaft music abduct that accumulates size close to music arm cut to undertake comparative, the place of crankshaft music abduct that the place of crankshaft music abduct that discovery produces bigger flash wants figuration force to compare flash of not easy generation needs figuration power tall 2 ～ 3 times. Adopt the craft plan of arm of mould figuration music to this kind so, when undertaking the mould is designed, must want the effect that produces possibly considering flash, try to notice when production and design. 2. A few measure that improve flash to be affected to figuration are met as a result of the existence of flash adverse to generation of Dui forge figuration effect, want to undertake according to the characteristic of the product craft and mould design the improvement of the respect in design and manufacturing process so, remove these adverse effects as far as possible. Have the following measure commonly: (1) is when forging and mould design, curve metabolic characteristic according to the appearance of music arm outline of the product and Dui forge, make material can include as far as possible in antrum of past mould form, reduce the formation of flash. If graph 5a place is shown, arm of the music before revising relies on outline of side of connecting rod neck lesser, easy form flash, and after the 5b that press a plan is revised, make local outline increases, put in order to increase make bulk, be eliminated effectively or reduce flash, improve figuration quality. (When 2) is calculated to be out of shape music arm has material volume, volume amount is designed not easily too greatly, overmuch material will naturally produce flash. The respect burning caustic with general product proper consideration can, if sex of product figuration craft is poorer, can undertake according to the experiment body is adjusted again. (3) designs flash storehouse on the mould, accept the restriction of experience and sex of craft of appearance of product music arm sometimes, flash is eliminated very hard. To remove the adverse effect of flash, can put intermediate mould to go up easy the place that forms flash opens flash warehouse (6) seeing a picture. But a bit need to notice: Can not machine thin mould of mill of convenient and large area because of the mould only, must stay have enough bear control an aspect, assure ply dimension W. Because of intermediate mould once mill is small, when figuration, the ply of whole music abduct is met decrescent or dimension of ply of occurrence music arm not all circumstance, after figuration of all music abduct is finished, the error is accumulated the conference is bigger, affect final length dimension precision; And if assured the ply of intermediate mould, when figuration, want to make sure intermediate mould is pressed to lean only, precision of whole length dimension assures very easily. 3. The generation of epilogue flash goes against the figuration of forging, should avoid and remove the adverse effect of flash, should bend to be out of shape with Dui the many sided such as computation of bulk of the rule, figuration and characteristic of music arm outline has a consideration thickly from figuration when craft and mould are designed, undertake example hold a memorial ceremony for according to experience, test and verify should undertake below a lot of circumstances through trying a model. Current, a lot of abroad forging the enterprise applies already extensively finite yuan of imitate technology, can foreknow in design phase flash distributinging circumstance, undertake optimizing correction thereby, the plan with sound formulate, reduce a mould to develop trial-produce cycle and trial-produce fare, so our home forgings to the company also should study gradually and use imitate technology, undertake science is designed. CNC Milling