The method of crackle of repair compressor beam

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One, the crucial equipment that compressor of overview 　 1800t is production of light-duty car frame. As a result of old use, bolt of edge of the beam on the main part getting power of compressor secured notch place to produce greater fore-and-aft flaw, along with the amplification of crackle, set the figuration model on crossbeam to arise subsequently be out of shape (1) seeing a picture, cannot work normally. Graph 1 on crossbeam crackle pursues this beam material is QT60-2, over all dimension is × 210mm of 1650mm × 1300mm, weight is 2.

3t. If machine a beam afresh, need the time of 1 many months about, cost is made an appointment with 2.

60 thousand yuan. Adopt the measure of repair beam now. Pointed horn of T of the bolt in structural design chamfer is the main reason that causes crackle, and reinforcement ply size is small, round part of reinforcement brim place is small reach use in bigger master piece, crossbeam produces the crackle that 700mm controls, fluctuation be well versed in, the method ability that must consider to solder to be united in wedlock with mechanical consolidate photograph to so long crackle assures the intensity of crossbeam. 2, because crossbeam is ball iron material,repair a method, solderability is poor, to increase welding line strength as far as possible, and from economically the consideration decides to use compound welder art. Process is to use pure nickel welding rod to lay a foundation, large area CO2 enrages the figuration that protect solder. The characteristic with this the oldest technology is solderability of the solder end the shop good, reduce matrix crackle and come off phenomenon; CO2 solders hot influence area is narrower, at the same time frit depth, thermal efficiency is tall, economy is reliable. Use above compound welder art, already economy is practical, can satisfy nodular cast iron again solder requirement. 1.

The preparation before solder checks the trend of crossbeam crackle seriously, along crackle place, open the groove of a 80 ° of ～ of deepness 20mm left and right sides, 70 ° with gas welding dig, use grinder and part to burnish machine burnish, show metallic burnish, the purify after opening groove is sundry, wipe the surface clean with alcohol (2) seeing a picture. Graph 2 groove 　 2.

Solder 　 1) transfers layer shop solder uses solder of dc hand arc, welding rod of Z308 pure nickel, diametical  3.

2mm, welding rod of the drying before solder 1 ～ 2h. Be in to groove with solder fire before solder undertake roast warm-up, solder voltaic 110A left and right sides. After solder is over, take the advantage of hot knock welding line with little weight. 2)CO2 solders welder chooses NBC-400 model,  of welding wire diameter 1.

2mm, material is qualitative H08Mn2Si. To assure CO2 gas purity, before solder convert of CO2 gas cylinder 1 ～ 2h, turn on the water 2 ～ 3. Solder parameter is: Voltage 22 ～ 24V, electric current 120 ～ 140A, solder fast 0.

15m/min. Use position of flat position welding as far as possible. Use across to solder law, solder hind takes the advantage of path of hot knock solder, eliminate stress. Because welding line does not need machining, to increase welding line strength, as far as possible broaden adds welding line tall (3) seeing a picture. The graph undertakes to each welding line serious ground is checked after solder of 3 welding line, the crackle of every check fish all needs to undertake repairing grinding filling solder. Be less than 5mm to length, the flaw with area greater interval does not do processing. 3.

Be opposite after mechanical consolidate solder of crossbeam on plane undertakes machinery tightens solid processing. With the board with large 25mm of × of 250mm of 2 1000mm × , machine 8-M24 screw. Use 60 bolt of M24 × to will be strengthened next board close solid is on crossbeam, strengthen board join the plane that there is flaw on crossbeam closely (4) seeing a picture. Graph after the plane on 4 mechanical consolidate originallies closely, use board of 12mm of wide 200mm, δ to whole beam periphery, clamp originallies closely. Because frame is bigger, periphery has 4-R125 again, adopted section to spell the method of solder so. Use 75 bolt of 6-M24 × to tighten solid, the clearance that put apart 20mm controls is in in checkpost, so that solid is tightened after use period of time, ensure crossbeam is in close firm position from beginning to end (5) seeing a picture. Graph after clamp of 5 metal strip tightened solid to adopt the method that above solders and machinery originallies closely, undertake checking to crossbeam, flatness of the beam after outfit machine is 0.

08mm/1000mm, via relapsing test and verify, did not produce out of tolerance to be out of shape, from October 1996 repair up to now, use in order. Of this beam repair charge actually to make an appointment with more than yuan 1300, repaired time to use 48h only. CNC Milling CNC Machining