The blemish rehabilitate technology of large cast

1.

Equipment of 2 gush solder, arc welding equipment, f103(C of pink of nickel radical solder ≤ 0.

15 8.

12 2 of ＜ of 0 ＜ Cr.

＜ of 5 ＜ Si 4.

5 1.

＜ of 0 ＜ B 1.

78 the others of Fe ≤ Ni) , cast-iron welding rod: Z308, z248. 1.

1 gush solder presses gush solder craft to carry out, reach slideway face warm-up 150 ℃ above, after the spray that finishs preliminary solder pink, heat spray face to 900 ℃ - 1200 ℃ above, level off surface is formed after making solder pink fused. Because warm-up is reached,heat time is long, area of workpiece be heated is larger, thermal stress is greater, produce crackle more easily than arc welding, liability of crackle of line systole generation is bigger at the same time. Because crackle tendency suffers the element effect such as ply of layer of gush solder time, gush, blemish size is restricted certainly, and the blemish that solder fills needs to clear clean, because dusting is medium proportion of the quantity that contain Fe is higher, formation gush layer relatively the color of arc welding and mother capable person more close. But because have the Ni of certain amount, cannot be close to more with color of mother capable person so, machining can undertake after solder fills. 1.

2 arc welding undertake with Z248 of cast-iron welding rod solder fills, cent of solder filling craft is planted, the first kind: The warm-up before solder comes 550 ℃ - 650 ℃ , hour of 5-8 of the heat preservation after solder fills; The 2nd kind: Before workpiece solder not warm-up, hour of 3-4 of the heat preservation after solder. Two kinds of methods all easy occurrence crackle, hard spot, after solder fills, not allow to enter a machining easily. Welding rod is low-cost. Use nickel radical solder of welding rod of Z308 of cast-iron welding rod fills, halt refrigeration answers to come between solder layer and solder layer 60 ℃ are the following, little air hole of solder filling area, crackle arises, machining sex is good, combinative strength is high, without fall off phenomenon, the oil absorption after be being machined as a result of machine tool slideway and welding rod play the effect of force, easy generation bites an edge, form " solder filling trace " , color of solder filling area and mother capable person have very big distinction, and welding rod price is high. 1.

3 results analyse craft of traditional gush solder, arc welding, after solder fills easy generation crackle, workpiece easy be heated is out of shape, appear easily 2 times stomatic, color of metal of solder filling place and difference of mother capable person are its common characteristic greatly, this also is the prime cause that traditional solder filling craft cannot solve rehabilitate of blemish of machine tool slideway thoroughly. 2, cast what blemish repairs glue to repair the effect and analysis the fill agent sort that uses in the enterprise now is various, quality also differs very far, the experimental eventuate basis of the fill agent that the article casts quality standard to ask with can be being satisfied only (choose abstruse but the card casts blemish to repair the AK01-2 in glue and AK01-2B) of two kinds of model. 2.

The 1 finishing before using gum: The HT250 test block that machines without passing two (the air hole that 100100 X50) surface has 10mm of ￠ 2- ￠ , sand holes a certain number of; The HT250 test block that passes treatment two (100100X50) , exterior surface roughness is 3.

2, the stomatic sand holes of 10mm of ￠ of 2- having ￠ a certain number of. Cut tool purify sand and oxidation skin with dynamoelectric tool or shovel above all, surface of reoccupy acetone cleanness. 2.

2 attune glue reachs gelatinize: The blemish fill of raw surface, should choose blemish of blame treatment surface to repair glue (AK01-2) , press 2:1weight or bulk scale take A glue respectively 2, b glue 1, mix adequately even (by agitate of a direction) exert oneself to do sth. glue with knife of special attune glue or vulcanite strickle, notice the airy inside hole eliminates, place attune colloid should be in 30-40 gives out inside minute; Machine the blemish fill of the face, should choose to machine face blemish to repair glue (the formulary scale that AK01-2B) presses a manual to go up, move colloid of A, B all, in gelatinize process, should notice to reach the protection of datum plane with exterior level off. 2.

3 effects detect with the analysis: After 12 hours, will raw test block undertakes bolus is handled casting, did not see fall off, exterior condition and color and datum plane are adjacent; The test block that will machined after 12 hours undertakes turning and milling afresh, did not see fall off, color and treatment surface are adjacent. 2.

4 conclusion: Place experiment glue is planted bolus of OK and contented gush, gush arenaceous, car, mill, Zuo , worry the demand that does not fall off, can satisfy performance side already repair a requirement; Color and matrix face are adjacent, cannot satisfy strict off color requirement, colloid is belonged to metalloid, need those who get a client to approbate, but repair cost low, use convenient, efficiency is tall, already also became a kind to repair a method extensively stage by stage. 3, cast blemish to repair the solder of machine to fill the effect and analysis 3.

1 try to make what prepare 200mm of × of 30mm of a Φ with the analysis marvellously try a club, material is HT250 character, exterior surface roughness is Ra0.

8, 4-5 is gotten in the surface the aperture of Φ 5mm deep 3-4mm, with AKZQB-2000C model cast blemish to repair machine undertake solder fills, filling material is chosen 0.

8# , ply is 0.

The sheet metal of 25mm and ply are 0.

The HT250 scrap of 4mm. Solder filling place did not see apparent boundary, intermediate zone region did not see carbide separate out, solder fills near filling dot of tiny, solder place metal organization is compact, did not see the generation of crackle. Whole normal temperature trying a club is reached near solder filling dot, color of metal of solder filling dot and mother capable person are same, filling material is 0.

The solder of 8# fills bit of material that compare a mother is more compact, filling dot and mother capable person send the solder that filling material pledges to be the same as material density is identical, metallographic organizes an analysis: Organization of flawless, circumjacent metallographic was not changed, without internal stress, did not appear phenomenon of sclerotic, bate. 3.

The solder of 2 slideway blemish fills the effect and analytic material are qualitative: HT200; Heat treatment condition: The surface quenchs 2, hardness 50, 56HRC; Did not undertake 2 the surface quenchs, hardness 170-230HB, 6mm of Φ of blemish Φ 1- ; Deep 3-4mm blemish is counted. AKZQB-2000C cast blemish to repair machine, filling material is 0.

8# , Φ 0.

The tinsel of 8mm reachs the scrap with HT200 qualitative material. Solder filling effect reachs an analysis: Macroscopical detect, color of metal of solder filling dot and mother capable person are same, without bite an edge, without burn mark, reach near solder filling dot whole make a normal temperature. Detect with 30 times magnifier and sclerometer spot solder filling circumstance, the result shows: Without apparent boundary, metal of solder filling dot is compact, flawless, without sand holes, 0.

180-220HB of hardness of filling dot of solder of 8# filling material, 210-240HB of hardness of filling dot of solder of HT200 filling material, did not quench slideway face solder fills near the dot, hardness HB160-210. Quench slideway solder fills bit of around hardness 51-56HRC, did not see phenomenon of anneal, bate, agent of classics flaw detection detects eligible. Can undertake machining, color of metal of solder filling place and mother capable person are same, the character of rehabilitate of blemish of contented treatment face detects requirement. 4, conclusion 4.

The craft such as the gush solder of 1 tradition, arc welding, put in the limitation with particular move to the blemish rehabilitate of cast, the machinability of gush solder is good, but easy generation crackle, heat is out of shape, the phenomenon such as anneal, color and difference of the mother's body are big, be united in wedlock for machinery, combinative strength is relative arc welding is a few lower. Filling effect and choice welding rod have the solder of arc welding to concern directly, do not produce natural disposition of the machinability of Z308 and crackle good, but solder filling trace and countenance already were eliminated as hard as the difference of the mother's body, and the price is high. The solder that the heat preservation after reaching solder warms up to also give big cast before the solder of the cast in traditional solder filling craft fills caused certain inconvenience. Cast blemish to repair glue to use convenient, the price is low, efficiency is tall, but belong to metalloid, color cannot be achieved completely consistent, unsuited strict to color requirement cast. 4.

2 use cast blemish to repair opportunity is right cast blemish has repair, cast is in repair process, do not warm up, changeless form, flawless metal of filling dot of generation, solder is compact, do not produce hard spot, without anneal phenomenon, can undertake any machining. The choice of filling material does not suffer what material pledges to restrict, fill character through different capable person the choice of material, can achieve the unity on function of solder filling dot, color and matrix. Filling material and matrix are united in wedlock for metallurgy, combinative strength is high, won't arise fall off the qualitative check standard that solder filling quality accords with cast product, it is a kind of when deserve extensive promotion new technology. Dan Zhu builds blemish to repair the solder of machine to fill limits is Φ 1.

5- Φ 1.

2mm solder filling dot fuses repeatedly the process of accumulation, the process is revamped in large area blemish in, repair efficiency is the only factor that restricts its to popularize application extensively. To big drawback, recommend traditional solder to fill craft and cast blemish to repair the compound application of machine. CNC Milling