Large steel casting machining characteristics and selection of
Release date:2017-03-13 Clicks:349 Article author:
A common problem of machining large steel castings
1, cast steel containing manganese, chromium, nickel caused by cutting tool wear, especially some large steel castings, a lot of cutting up a workpiece has been damaged, causing the trace or even "dagger", affecting the machining efficiency and quality of light, to cause the workpiece scrapped!
2, a white sand, casting defects or intermittent turning, breaking knife, resulting in high cost of tool.
Two, steel castings in the processing of CNC blade selection errors:
At present, many engineers and some steel processing plants, often used YT type alloy cutter or coated carbide tool for processing P type metal, in fact;
1, you want to jump out of the steel with YT alloy cutter machining of cast iron with YG, misunderstanding of Dao head ", because the cast steel is short chip material, which is different from the steel forging! Especially rough machining or intermittent turning of steel castings, if using YT alloy knife head, usually tipping!
2, if you use the YG alloy or coated cemented carbide, a tipping phenomenon, can not take responsibility simply ascribed to YG knife head impact, but after all is the reason for the poor wear resistance.
Three, the correct selection of steel casting machining tool materials
1, if it is occasionally single production, rough machining can be used YG type alloy cutter, angle grinding angle and concrete before and after processing of cast iron is similar, grinding tool main angle right according to the machining process and machine tool system is rigid; if the low rigidity of the system, the main angle by 83 degrees or 90 degrees (depending on the end face and shoulder processing needs) if the machine has good rigidity and the clamping force is good, as far as possible the main tool angle of about 45 degrees.
2, if the batch processing is often cast steel, Valin superhard BN-s20 is designed for a machine R & D steel castings indexable insert brands; BN-S20 brand is HLCBN tool red hardness than the hard alloy and ceramic tools, and ceramic tools impact, a large amount of experiments and the case that their life is the alloy tool several times to several times. BN-S20 grades can be used for coarse processing, can also be used for semi finishing and finishing machining of alloy steel castings to improve machining efficiency. Suitable for processing large steel castings, such as processing is also suitable for high temperature alloy, heat resistant steel, high hardness steel / cast iron, hardened steel, nitrided steel, steel and other materials with high hardness. And excellent performance in rough machining.
Below is the Valin superhard BN-S20 NC machining of cast steel blade parts:
Valin superhard BN-S20 CNC blade
On the surface of steel casting, ladle sand, sand more, the original hard alloy cutting tool machining, easy chipping, tool loss, high processing cost and low efficiency.
Super hard tool, BN-S20 brand parameters are as follows: depth of deep ap=2-3.5