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Analysis of the results of quenching Machine Tool Repair cause of poor
作者:  来源: http://en.tenyes.com/gsxw/n613.html   发布时间:2015-08-04

Through  several traditional welding processes in welding defects result of  quenching machine guide, quenching Machine Tool analyzes the results of  poor repair reasons. By  casting defect repairing machine results in repairing machine tool  guide surface, determining a real practical guide surface repair the  machine and process technology for the country to reduce energy waste,  for enterprises to increase efficiency. Number  of rail defects: 4, material HT200-400, each guide number of defects  ≥2, each rail defect area S <1000mm2, the depth h <8mm number of  defects of less than 2, S> 1000mm2, the depth h < the number of defects of less than 8mm 2, heat treatment: 3 is not surface hardening, a surface hardening has been carried out.


Spray  equipment, arc welding equipment, nickel-based solder powder F103  (C≤0.15 8.0 <Cr <12 2.5 <Si <4.5 1.0 <B <1.7 Fe≤8  remaining Ni =, cast iron welding rod:. Z308, Z248 and welding results After  analyzing the spray by spray process is executed, the track surface  preheated to 150 ℃, the completion of the preliminary solder powder  spraying, the spray-painted surface is heated to above 900 ℃ -1200 ℃,  make the solder powder melts to form a flat surface after due pre- Hot and heating for a long time, a large area of workpiece  heating, heat stress is large, more prone to cracking than the arc,  while the linear shrinkage greater tendency to crack.

 

Arc:  The Z248 cast iron electrode welding process carried out by the  respective, two types of welding processes, first: preheat to carry out  welding 550 ℃ -650 ℃, the welding heat 5-8 hours after the first two kinds: the workpiece before welding without preheating, post-weld heat for 3-4 hours. Welding  quality of both methods are not easy to guarantee, prone to cracks,  hard spots, is not easy to be machined after welding. Welding cheap. Z308  performed using nickel-based cast iron electrode welding process by  pressing the corresponding other heating should pause between states  hammering process, solder layer and solder layer is cooled to below 60  ℃, less porosity welding area, cracks, machining good combination high  strength, non-shedding phenomenon, due to post-processing machine rails  suction and blowing power electrode, easy to produce undercut to form a  "welding marks," In addition, as the nickel electrode contains a lot of  elements, welding area has color and base metal It is very different, and the electrode expensive. After  the results of the analysis is easy to produce conventional spray,  electric arc welding process, welding cracks, thermal deformation of the  workpiece vulnerable, prone to secondary porosity, welding metal at the  large differences in color and the base material is their common  characteristic, which is the traditional welding Technology can not solve the root causes of Machine Tool bug fixes. Not  traditional welding processes used to repair the visible machined  surface, apply to non-working surface or invisible repair the working  plane. Part of the welding material of higher prices, stable welding  quality is not easy, requiring the operator to technology and rich  experience.


Welding  effect and analysis of casting defects patching machine: the production  and analysis of test bars prepared a test bar Φ30 × 200, the material  is HT250, surface roughness Ra0.8, surface drilling in deep 3- 4-5 Φ5mm 4mm  hole, with the AKZQB-2000C casting defect repair welding machine, fill  material used 0.8 #, metal sheet thickness of 0.25mm and 0.4mm thickness  of iron HT250. Welding  place no obvious dividing line, small transition region, near the  welding point no carbide precipitation, dense metal at welding, no crack  generation. Conclusion:  The macro detection, near welding points and bars throughout the test  at room temperature, welding spot metallic color and the same base  material, fill material to the welding point 0.8 # denser than the base  material, the same material as fill material for the welding point the  same as the base material density, microstructure analysis: no cracks,  surrounding microstructure did not change, no stress, hardening does not  appear, softening.