Cold heading die steel is commonly used in high alloy die steel (such as Cr5Mo1V, Cr12, Cr12MoV, 7CrMo2V2Si, etc.), high speed steel (such as W6Mo5Cr4V2, W18Cr4V, powder high speed steel, etc., after quenching these steel parts, the surface generally has a high hardness; After quenching, the hardness reaches about HRC60. CBN tools are commonly used for turning after cold quenching die steel. The cutting parameters of CBN tool after quenching are further optimized according to the specific working conditions.
First, CBN tool fine car quenching die steel cutting parameters optimization CBN tool fine car hardened die steel, its workpiece hardness is higher than 45HRC, the best effect. The cutting speed is generally 80~120m/min. The higher the hardness of the workpiece, the lower the cutting speed. For example, the workpiece with a hardness of 70HRC should be 60~80m/min. The cutting depth of the finished car is 0.1~0.3mm, the feed rate is 0.05~0.025mm/r, the surface roughness of the workpiece after finishing the car is Ra0.3~0.6μm, and the dimensional accuracy can reach 0.013mm. If the standard CNC lathe with good rigidity can be used, and the cutting edge of the CBN tool is sharp, the surface roughness of the workpiece after finishing the car can reach Ra0.3μm and the dimensional accuracy can reach 0.01mm. When the car is quenched, the alloy steel is generally not used because at a higher cutting speed, a large amount of cutting heat is carried away by the chips, and rarely stays on the surface of the workpiece to affect the quality and precision of the machined surface.
Second, CBN blade processing parameters during intermittent cutting optimization CBN tools use HLCBN suitable for strong intermittent turning quenching die steel; line speed is generally 60-70 m / min. If the alloy die steel is deformed after quenching and the machining allowance is large, the recommended speed of “Hua Ling Super Hard†is 45m/min. Although the turning speed is lower, the depth of the eating is increased by 5 times. The usual CBN tool is generally The depth of eating is only less than 0.3mm; while the depth of the HLCBN is about 7mm, the blade does not collapse. The amount of the tool is selected according to the rigidity and roughness requirements of the machine tool; if the machine tool is rigid, the HLCBN tool is suitable for processing the quenching die steel with a feed rate of 0.1 mm/r, and can cut the majority of the allowance after quenching with a large depth of cut; About 0.3mm as the fine car balance. Overview Turning and quenching die steel is a new process. The cutting parameters of CBN tools should be selected according to the hardness and machining allowance after quenching of cold work die steel.
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