Method for producing a valve body for an electromechanically operable valve, a valve body, and an electromechanically operable valve comprising the valve body

摘要

The present invention relates to a method for producing a valve body (1) for an electromechanically operable valve, a valve body (1) and an electromechanically operable valve comprising the valve body (1). The valve body (1) is produced by providing a base element with a circumferential sidewall having a first portion (15), a second portion (16), and a third portion (17),the sidewall being made of a ferromagnetic material and enclosing a cavity extending along a longitudinal axis. The third portion (17) is positioned in longitudinal direction between the first portion (15) and the second portion (16). A thickness of the third portion (17) is smaller than a thickness of the first portion (15) and the second portion (16). Hardening the third portion (17) is achieved by laser heating, wherein the ferromagnetic material is warmed up to a desired temperature and the laser is moved across the third portion (17) once the desired temperature is reached. This laser hardening transforms a structure of material of the third portion (17) into a martensitic structure. Through the locally decreased thickness, a bottleneck for a magnetic flux is created and a magnetic flux bypass in the valve body (1) is reduced due to magnetic saturation. On the other hand, a structural resistance of the valve body (1) remains high due to the laser induced hardening.