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1. Frequently asked questions when processing high hardness surfacing layers and welded parts
After the surfacing of the hardfacing material, most of the workpieces are uneven, and the surface hardness is high, the internal hardness is uneven, and the interior contains a large number of hard spots and pores, which increases the cutting force during processing and produces greater vibration and Impact, especially after the repair of the workpiece, when the tool encounters the alloy surfacing of the hardfacing material, it is easy to collapse, and the high hardness of the surfacing layer and the welding point are generally high hardness and Wear resistance, which will produce large cutting force and cutting heat during processing, and accelerate the wear of the tool to become dull.
2. Mistakes in tool selection when processing surfacing layers and repairing workpieces
At present, most SMEs are still in with a solder alloy tools such as YG6, YG6X other brands, excellent impact resistance of such a tool in itself, but because of its low red hardness, wear of the blade after welding experience hard point, resulting in chipping. Therefore, many factories mistakenly believe that alloy welding tools are not resistant to impact, but in fact, they are still not wear-resistant.
The CNC machine clamps the carbide turning tools. Most of these tools contain coatings. Compared with the welded alloy cutting heads, the wear resistance is obviously improved and the processing efficiency is also improved. However, the impact resistance of the coated cemented carbide itself does not change, and the thickness of the coating generally does not exceed 30 microns. The general physical coating is only about 8 microns. The coated tool is surfacing in the case of hardfacing materials. After the hard spot of the workpiece is collapsed, it is basically the same as the ordinary welded alloy cutter head. Therefore, in the production practice, the coated alloy cutter is consumed by a large amount of abnormality, resulting in high cost of the processing tool ; ceramic blade Generally used in fine cars, the impact resistance is not good, no longer repeat them.
3. Hualing super hard BN-S20 brand strength turning tool
BN-S20 is a new type of machine clamp indexable turning tool introduced by Hualing Superhard for the mechanical processing industry. The BN-S20 grade superhard tool avoids the tool durability reduction caused by the addition of metal adhesive, and the tool material is adopted. Medium grain CBN; super high temperature and high pressure synthesis after more than 10 minutes. The indexable heavy-duty powerful blade with excellent impact resistance can be used on both the front and the back (the square blade can be indexed 8 times). When the irregular welding layer and the welding tumor are processed, the tool does not collapse and can be turned over a large margin; for example, when the surfacing welding roller is processed, the surfacing hardness is above HRC55, and the BN-S20 can be intermittently eaten at a depth of 2 mm or more. Turning, this is different from the common metal adhesive CBN tool on the market. It can be used in heavy-duty processing of large workpieces after surfacing of hardfacing materials. It is also used for processing high-speed steel rolls with hardness above HSD85, cold-rolled steel forging rolls with hardness above HSD90, and hard turning of GCr15 bearing steel with hardness HRC62. And the riser processing of cast steel poured steel, high-speed steel, high-manganese steel, high-chromium steel, high-chromium high-nickel alloy roughing and high-speed finishing, and the amount of hardening of the quenching material such as die steel is large. In the field of car grinding or rough grinding by car.
4. Hualing super hard BN-S20 grade CBN tool use
There is no requirement for the spindle speed of the machine tool . The BN-S20 tool does not require a very high cutting line speed. It can take 45-130m/min (the speed depends on the rigidity of the machine tool used); After the workpiece, it is not necessary to correct and polish the surface of the irregular workpiece, and the surface of the pit can be directly cut off.
5. Notes
When processing high-hardness surfacing layers and repairing workpieces, the substrate, welding method and welding consumables of the workpiece also have an influence on the selection of the tool . The BN-S20 grade superhard tool is very suitable for iron-based, cobalt-based, alloy and other wear-resistant piles. For the cutting of the welding material, be careful not to add coolant when using.
Cutting of hardfacing materials and the use of superhard tool grades
In machining, the workpiece after surfacing by hardfacing materials is difficult to process due to high hardness and irregular surface. Especially for high hardness surfacing layers above HRC40, ordinary cemented carbide tools often chip in the process or Burning knives, resulting in low processing efficiency and increased processing costs; Hualing Superhard (formerly Henan Institute of Superhard Materials) developed a new grade of tools to solve many practical problems in processing, suitable for iron-based and cobalt-based The machining of wear-resistant surfacing materials such as alloys is widely used in mechanical spindles, metallurgical bearing blocks, mining, cement, electric power wear parts, mold surfacing repair and cutting after rolling of roll mills.