Method of fan lamina v

This factory is trying method of 1 choice aggrandizement board the comparative trial that attended to undertake solder of oxygen acetylene gush and electric arc v respectively. Gush solder heats rate is slow, heat time is long, bring about test specimen to be out of shape serious; And electric arc v heats time is short, test specimen is out of shape lesser, but attenuant rate is higher. Because the appearance of impeller reachs the reason such as stiffness, form of the school after impeller is out of shape is more difficult, together with is in the course that produces production vane wheel, impeller itself already had certain production deviation, reason is the dimension that assures impeller and form deviation this one main demand, use be out of shape method of lesser electric arc v. 1.

2 choices material gets abrasive tatty work, choose carbonization tungsten or tall chromic alloy cast iron to regard v as material commonly. But the method that uses electric arc v, can make carbonization tungsten primitive grain fuses for the most part, tungsten is contained in what separate out hardness does not consider v layer tall compound compound, affect wearability rise; And use Tang Shan friend to amount to material of special type solder the alloyed powder of Fe-05 Gao Ge that limited company produces piece as v material, can make v layer contains Cr7C3 tall hard look, and its price is cheaper than carbonization tungsten. Craft of 2 v craft is the main factor that affects v quality. According to the requirement to impeller, put the craft emphasis of v lamina in reduce after dilute is led and reducing solder, be out of shape these two respects. 2.

The 1 dilute that reduces layer of attenuant rate v is led, frit of capable person of the mother in mirrorring v layer enters quantitative per cent. Impeller mother capable person is Q235 or 16 Mn commonly. To wear-resisting alloy material has attenuant effect after mother capable person is fused, can reduce the result that v layer alloy turns, influence wearability. In make sure the premise of mutual fusion issues mother capable person and wear-resisting alloy, lowering attenuant rate is to reduce mother ability fused quantity. The course fumbles ceaselessly, this factory thinks: Electric current masters in 330-350 (A) , voltage masters in 25-30 (V) , weld time masters in 1 minute of 30 seconds, effect of v craft standard is best. Measure to reduce mother capable person to fuse, should notice to make v electric current is reduced, speed of low, v accelerates voltage drop; But v electric current is too small, can make be able to bear or endure adjust gold powdery piece fuses not easily, bring about v speed to decelerate. Be about to make v speed is accelerated, need to increase v electric current again. This one contradiction finds optimal combination through experiment ability only. When the solderer operates, need to notice the following at 2 o'clock: (1) electric arc swings extent as far as possible small, with just exceeding powdery piece margin advisable, but cannot bite an edge; (2) the declivous solder that uses gradient to be 10 ° of 5 ° ～ , make bath flow direction agrees with the direction that apply solder. 2.

The impeller after v of deflection of 2 control impeller, require test of static, dynamic balancing not only when check and accept, the measure that still requires each face, appearance and position satisfy deviation requirement. Because v can make impeller be heated inhomogenous, generation welding stress, bring about solder be out of shape etc, reason still needs to take proper technology step, ability is out of shape impeller control is inside tolerancepublic errand limits. Step of the following craft took when v: (1) assure to solder to be over in the v on each lamina orderly after a powdery piece, rotational impeller, in symmetrical lamina corresponding position, v another pink piece. Such loop move back and forth, till end each lamina v. With this order v, can make before impeller, hind dish even systole, can avoid thermal stress too concentration, decrease solder be out of shape. (2) because v layer produces fore-and-aft, transverse systole to cause in cooling process,hammer attacks welding line impeller to be out of shape is. Every v is over one pink piece, with little weight tat, extend v layer, can compensate partial systole to measure, decrease be out of shape. (3) the hot input amount that reduces line capabilities to reduce line capabilities to be able to make blade gets decreases, thermal stress decrescent. This and the requirement that lower attenuant rate are consistent. CNC Milling