Method for improving high-speed machinability of cast iron

Abstract

The invention discloses a method for improving high-speed machinability of cast iron, which comprises the following steps of: step 1, controlling total amount of other elements except carbon (C), silicon (Si), manganese (Mn), phosphorus (P) and sulfate (S) in cast iron not to exceed 0.7 percent of the cast iron; step 2, analyzing ingredients of each element in the cast iron, and respectively determining content of each element such as chromium (Cr), molybdenum (Mo), titanium (Ti), nitrogen (N) and sulfate (S); step 3, calculating a ratio of Cr and Mo and a ratio of Ti and N; step 4, judging whether the ratio of the Cr and Mo is more than 2 or not and whether the ratio of Ti and N falls in between 0.5 to 1.5, and judging whether the content of S is more than or equal to 0.08 percent of not; and step 5, satisfying the conditions by increasing the content of Cr, Mo, Ti or N. By utilizing the interaction of elements in the cast iron, the content of trace elements in the material is unnecessary to control intentionally, and the requirement of the trace elements in the material is lowered, so that the high-speed machinability can be guaranteed without utilizing a high-purity material, the resource can be saved, the application range of the material can be enlarged, and the cost can be remarkably reduced.

Description

technical field [0001] The invention relates to the technical field of smelting, in particular to a method for improving the high-speed cutting performance of cast iron. Background technique [0002] In modern industrial production, in order to ensure the production efficiency and machining accuracy of parts, the following two technical means are usually adopted: on the one hand, the number of revolutions of the machine tool spindle is continuously increased for high-speed cutting, such as when fine boring the cylinder bore of an automobile cylinder block. The number of revolutions of the machine tool is as high as 20,000 revolutions; on the other hand, the number of parts processed at one time without changing the tool is constantly increasing. [0003] The above-mentioned technical means put forward more stringent requirements on the high-speed cutting performance of cast iron materials. For the cast iron material itself, due to its wear resistance and other performance a...

AI Technical Summary

Problems solved by technology

[0007] However, in order to ensure high-speed cutting performance, the allowable content of each element is very low. For cast iron materials, such a low amount cannot be achieved. Only high-purity materials are selected. Even if high-purity materials are selected to meet the requirements, the production cost is very high high unproductive

[0008] In the prior art, there is no one that treats the elements in cast iron as a whole, comprehensively utilizes the interaction between them, and controls them to form special compounds that can improve workability, or prevent them from forming compounds that affect workability. Thereby improving the method of high-speed cutting performance of cast iron