Of technology of rehabilitate of blemish of face of machine tool slideway discuss with the analysis

The preparation before 1 experiment: 2.

1.

Amount of 1 blemish slideway: 4, material qualitative HT200-400, ≥ of amount of every slideway blemish 2, every slideway blemish is in 1000mm2 of area S ＜ , the blemish amount of 8mm of deepness H ＜ not less than 2, s ＞ 1000mm2, the blemish amount of 8mm of deepness H ＜ not less than 2, heat treatment condition: 3 did not undertake the surface quenchs, 1 already the surface quenchs. 2.

1.

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

158.

＜ of 0 ＜ Cr 122.

＜ of 5 ＜ Si 4.

51.

＜ of 0 ＜ B 1.

8 the others of 7Fe ≤ Ni ＝ , cast-iron welding rod: Z308, z248. 2.

2 solder filling result and analysis 2.

2.

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. 2.

2.

2 arc welding: Undertake by corresponding craft 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 ℃ - undertake solder fills when 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. Filling quality all assures the solder of two kinds of methods not easily, easy occurrence crackle, hard spot, after solder fills, not allow to enter a machining easily. Welding rod is low-cost. Use nickel radical Z308 of cast-iron welding rod undertakes by corresponding craft solder fills, additional heat voice hammer attacks craft, 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 " , because welding rod is medium,contain many nickel element additionally, color of solder filling area and mother capable person have very big distinction, and welding rod price is high. 2.

2.

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. Traditional solder filling craft does not apply to the rehabilitate that machines a face it is thus clear that, apply to the rehabilitate that is not treatment face or sightless treatment face. Price of partial solder filling material is higher, solder filling quality is stabilized not easily, requirement handlers technology, seasoned. 3, cast blemish to repair the solder of machine to fill the effect and analysis: 3.

1 try to be made marvellously with the analysis 3.

1.

1 preparation 30 × of a Φ of 200 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. 3.

1.

2 solder filling place undertakes burnish, polish, the metallographic that make analyses test piece, if metallographic organization pursues 1, graph 2. Graph 1 left is HT250 of mother capable person, right is 0.

8# filling material, graph 2 left are HT250 of mother capable person, right is HT250 scrap filling material. 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. Conclusion: Macroscopical detect, 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 analysis 3.

2.

The preparation before 1 solder fills: Slideway amount: 4; Material is qualitative: HT200-HT400; Heat treatment condition: The surface quenchs 2, hardness HRC50, 56; Did not undertake 2 the surface quenchs, hardness HB170-230, have 6mm of Φ 1- Φ ; Deep 3-4mm blemish is counted. AKZQB-2000C cast blemish to repair machine 1, filling material is 0.

8# , Φ 0.

The tinsel of 8mm reachs the scrap with HT200 qualitative material. 3.

2.

2 solder filling effect reachs an analysis: With AKZQB-2000C model cast blemish to repair machine, filling material is chosen 0.

The Φ of 8# 0.

The tinsel of 8mm reachs the scrap of HT200, reach the slideway face blemish that did not quench to undertake solder fills to quenching respectively, after burnish, polish, macroscopical detect its solder filling effect, 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.

HB180-220 of hardness of filling dot of solder of 8# filling material, HB210-240 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 HRC51-56, did not see phenomenon of anneal, bate, agent of classics flaw detection detects eligible. 3.

2.

3 solder filling conclusion: With cast blemish to repair opportunity is right blemish place undertakes solder fills, matrix is in normal temperature condition, stress-free, flawless, without bite an edge, without solder filling trace, solder fills the metal is compact, without phenomenon of anneal, bate, without hard spot, without sclerosis, can undertake machining, color of metal of solder filling place and mother capable person are same it is its the biggest characteristic, the quality of rehabilitate of blemish of contented treatment face detects requirement. Cast blemish to repair machine use principle of resistor heat build-up, fuse filling material instant be in in blemish, combinative strength is high, without fall off likelihood, diameter of solder filling dot can amount to Φ 1.

5mm, per sec. finishs frequency of solder filling place to be able to be amounted to 25 times, solder piece ply is amounted to 0.

4mm, apply to the of all kinds blemish such as face of solder filling treatment and blame treatment face, length of solder filling time depends on the size of blemish, cost is low and the cast with big drawback does not have solder filling meaning. The silk that function of filling dot of solder of filling material basis asks to be able to choose different capable person to pledge, piece, scrap, not be to supply data only, get convenient, the price is low. 4, conclusion: The craft such as traditional gush solder, 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 too big, combinative principle is 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; Do not produce a gender of the machinability of the common and cast-iron welding rod such as Z248 and crackle all not good. 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, overall analysis, the blemish that a few problems in traditional solder filling craft make cast arises cannot proper repair, different position, different quality asks, answer to choose to apply according to actual condition. Be aimed at machine tool slideway blemish rehabilitate, the experiment proves to answer to choose cautiously on blame treatment face, should avoid to choose on treatment face. Use cast blemish to repair opportunity is right cast blemish undertakes repair is a kind of new technology, 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, solder filling quality accords with the qualitative check standard of cast product, it is a kind of when deserve extensive promotion new technology, be aimed at the blemish rehabilitate of machine tool slideway, practice proves OK and extensive applying, can satisfy its the requirement of qualitative check standard. Dan Zhu builds blemish to repair the solder of machine to fill the process 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. According to cast particular case, the blemish of the size inside certain limits can apply directly cast blemish to repair machine undertake solder fill, to big drawback, we recommend traditional solder to fill at the same time craft and cast blemish to repair the compound application of machine, use namely cast blemish to repair machine the exterior crackle that in solving traditional solder filling craft, appears, exterior machinability and color need the issue such as different, make broad cast is had but the meaning that solder fills, solve the repair problem of cast blemish finally thoroughly. Anyhow, correct application, promotion casts blemish to repair blemish of machine rehabilitate cast, the reject remelting that because cast blemish,decreasing and causes, increase the economic benefits, import that reduces the sources of energy to use up a respect to have reality for the country for the enterprise! CNC Milling