Tie-in of pedrail of 395B power shovel of axial aperture solder repair

The article is analysing power shovel tie-in and the weldability foundation that axial Kong Cai expects to go up, made solder reasonably repair craft and after filling solder bore hole craft, carried out tie-in axis aperture successfully solder repair. The colliery of open air of channel of black another name for Taishan Mountain that 395B power shovel is production of American BE company is collected basically pare equipment, bucket cubage is 32~42m. Move in its in, the aperture of axis of two rounds of balance wearing on pedrail wearing often appears rupture, the phenomenon that break a circle, how to use electric welding and machine to this kind of large component part process instrumentation has repair, prolong its service life, assure power shovel safety, reliable, economy move, reduce the main task that its move and overhauling cost is management of outdoor excavate equipment, overhaul. If the graph is shown 1 times, my unit power shovel of a 395B, the course is used for a long time, the installing hole of the tie-in of pedrail wears away serious, already cannot use, require repair (see a picture 2) . The material that balances tie-in via analysing this is Q345 of steel of low alloy excel in, the material of the join axis aperture of tie-in is cast steel, if want the axial opening that repair ruptures, need solders aperture of cast steel axis to tie-in of steel of low alloy excel in, belong to two kinds of heterogeneous material solder, have certain difficulty. We analysed cast steel and steel of low alloy excel in the weldability of two kinds of material, chose appropriate welder art, got satisfactory repair result. 1 bucket material and material of tie-in of power shovel of 395B of its weldability analysis are Q345 of steel of low alloy excel in, material Q345 weldability is good. Its chemistry composition and mechanical sex visibility are expressed 1, 2. Material of tie-in axis aperture chooses cast steel, if choose ZG230-450, although weldability is good, but intensity is poor, cannot use as get the works with greater power. If choose cast steel ZG270-500, although have stronger height and good plasticity, but weldability is poorer, the blemish such as easy occurrence sclerosis, hot crack, cold crack. If soldering in the process, use solder appropriately method and technology measure, can avoid afore-mentioned flaw, we reach welder to its weldability art undertook study. Its chemistry composition and mechanical sex visibility are expressed 3, 4. When ZG27-500 of Nextpage cast steel solders, the reason of occurrence hot crack is: It is big electric current, fast solder; 2 it is content of sulfur, phosphor tall. If use CO2 gas to protect solder, render solder uses small electricity, welding wire uses welding wire of JM-56 solid core (mechanical function, chemical composition sees a table 5, 6) , this welding wire contains manganese the volume is high, manganese is united in wedlock easily when high temperature with sulfur, generate manganese of vulcanization of high melting point, can prevent hot crack effectively. Through the analysis, CO2 gas is used to protect solder in repair process, have the following advantages: Tall 2~3 of efficiency of ① comparing arc welding times. ② contains hydrogen the amount is smaller than low hydrogen solder, crack resistance is better. 2 solder method and craft 2.

1 clear the situation breaking a circle that if be repair axis aperture,reachs preparation, use carbolic arc to enrage dig to excise tie-in to go up above all already tatty axis aperture, grind with horn next machine wear the balance axial aperture burnish is clean, must not put have dirt, ferruginous. The place that solder fills to need before filling solder undertakes sufficient warm-up, use heat board undertake warm-up, warm-up temperature is 200 ℃ , undertake integral filling solder next, choose TM -771S283319-K02, the diameter is 1.

6mm welding wire, CO2 serves as protective solder gas to wear axial aperture to apply solder evenly to two rounds. Because axial Kong Shiyuan is serious, filling solder amount is larger, the welder that uses layer upon layer v in filling solder process so art, soldering ensure in the process the generation that waits for weld defects without be mingled with, according to axial aperture different position breaks round degree to decide v number of plies, because v ply brings about turning to had been measured greatly too,avoid big. Filling solder process cannot discontinuous, want to finish, the circle inside aperture of the countershaft after filling solder heats temperature comes 300 ℃ , the cotton cloth that use stone encases make its slow and cooling, with reducing hardness of filling solder surface. After filling solder ends, it is to undertake boring hole next. 2.

Aperture serves as li of blind that bores hole to balance the installation that wear an axis with two rounds after 2 filling solder fiducial, use portable boring machine, match with self-restrained clamping apparatus (there is round opening among circle armor plate, put in blind aperture to rise to support boring staff, the action that the coaxial that assures aperture of inside and outside spends) undertake searching, the purpose is to make sure the coaxial of aperture of inside and outside is spent. The opening that needs treatment searchs hind, consolidate installs boring staff, installation bores hole nose, undertake boring hole, deepness of the feed of boring lever rotate speed, boring cutter, penetration of a cutting tool notices when bore hole, the phenomenon that assures boring lever to because a few reason produces above,do not vibrate, ensure thereby the quality that machines the surface and precision, also make bore hole at the same time the service life of equipment is able to assure. When final choice boring, deepness of penetration of a cutting tool is in certainly 0.

2 ~0.

4mm, increase boring lever rotate speed as far as possible inside the range that equipment permits, machine aperture in order to rise inside exterior quality, satisfy what wear evenly two rounds to assemble need. If pursue,3~ graph is shown 5 times. 3 last words wear proof of the installation after passing this method rehabilitate evenly, axis, Kong Pei closes proper, coaxial is spent also achieved a requirement, satisfied the working requirement of equipment, used this plan to handle 5 same hole, carry out a proof, this scheme operation is handy, quick and effective, treatment charge is reduced greatly, also improved facility at the same time dispatch rate, assured the use of mine equipment, prolonged the service life of equipment, indirect ground gives the economic benefits with was brought regular on mine. CNC Milling