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The Influence of Cutting Parameters on Carbide Inserts

In metal cutting processing, the carbide inserts is only a carrier in production. The most significant impact on the performance of the carbide inserts is the cutting parameters in the processing. A set of suitable cutting parameters can make the carbide inserts performance more outstanding and avoid affecting the quality of the inserts from one-sided judgment. Only in accordance with the characteristics of different insert geometries and matching appropriate processing parameters, can the production be achieved twice the result with half the effort.

1.Cutting Speed: The cutting speed tests the wear resistance of the carbide inserts. The cutting speed affects the service life of the inserts, and it has a linear trend with the service life of the carbide inserts. This is the same as the selection of the feed rate and the back cutting depth in the three elements of cutting, but the effect is more significant .

During processing, it is necessary to adjust the cutting speed according to the process state of the workpiece, and try to avoid the speed area that can form built-up edge. For example, in some severe intermittent machining and poor rigidity of the process system, a lower cutting speed is generally selected; when a lower surface roughness is required for the workpiece, the cutting speed needs to be increased to avoid the speed area that can form built-up edge so that the  performance of carbide inserts can be better shown.

2.Feed Rate:As a factor that affects the wear resistance of carbide inserts, feed rate is not as effective as cutting speed, but it cannot be ignored. The main factors that limit the feed rate in processing are the strength and rigidity of the machine tool itself, and the rigidity of the cutter bar and the inserts. According to the characteristics of the blade geometry, adjust the feed rate to obtain a satisfactory chip breaking state.

3.Back Cutting Depth:The back cutting depth should be comprehensively selected according to the process quality requirements of the workpiece and external conditions such as equipment. Compared with roughing and finishing, the roughing should choose a larger back cutting depth.Workpieces with black skin on the surface should be with the first cut that the cutting-in thickness is deeper than the dry black skin to avoid instantaneous damage to the carbide inserts by the hardness in the surface black skin. In order to achieve high workpiece quality and accuracy, it is necessary to select a relatively small back cutting depth, which will make the cutting more brisk and stable.

The influence of the selection of the back cutting depth on the carbide inserts: (A)The increase of the back cutting depth will lead to an increase in cutting force. Under the condition of insufficient toughness of carbide inserts, the probability of blade damage may increase. (B)The increase of back cutting depth will cause the rising of cutting temperature and accelerate the blade wear. Regarding to the back cutting depth, it is more necessary to choose and set the value according to the process requirements of the workpiece.

This article briefly analyzes the influence of cutting parameters on the carbide inserts, and summarizes the preliminary ideas for the selection of cutting parameters in machining, hoping to resonate with metal cutting practitioners and effectively reduce the cost of blade use.


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