66results about How to "No embrittlement" patented technology

The invention provides a method for preparing hard alloy through stability regulation and control and belongs to the technical field of hard alloy material and powder metallurgy. The method includes the steps that firstly, round hard alloy bars are prepared, the two round hard alloy bars are taken and are vertical up and down, the ends of the two round hard alloy bars are adjacent, and the two round hard alloy bars are sequentially arranged in a vertical floating region of a zone melting furnace and vacuumized; the operating power is set to be 60%-95% of the total power, the power is increased to the set power within 20-30 minutes, after the contact ends of the round hard alloy bars form the beam-shaped stable molten state, the round hard alloy bar on the lower side descends, and the round hard alloy bar on the upper side descends synchronously till the round hard alloy bar on the upper side is taken out and serves as the hard alloy bar obtained after zone melting; and the hard alloy bar obtained after zone melting is arranged in a vacuum heat treatment furnace or a carbonizing oven, the carbonization atmosphere such as methane or carbon monoxide is injected, heat is preserved for 1-3 hours at the temperature ranging from 900 DEG C to 1,100 DEG C, the hard alloy bar is cooled to the room temperature along with the furnace, and then a super-coarse grain hard alloy bar is obtained. The super-coarse grain hard alloy with the excellent performance can be prepared.

The invention discloses a manufacturing method of an electric heating push rod of an electronic thermostat of an engine, which comprises the following steps that: blanking: a hollow steel tube with the length being more than that of the push rod to be processed is cut off by a blanking machine; bottom welding: the bottom of the hollow steel tube is sealed; threading: a magnesium oxide rod or a magnesium oxide tube with the length being less than that of the push rod to be processed is selected, an electric heating wire is uniformly wound outside the magnesium oxide rod or inserted into the magnesium oxide tube; tube penetration: the magnesium oxide rod or the magnesium oxide tube is inserted into the hollow steel tube; filling: heat transfer powder is filled inside the hollow steel tube; tube reduction: the hollow steel tube is reduced through a tube reducing machine; polishing: the surface of the reduced steel tube is polished through a grinding machine; cutting: the steel tube with the surface being polished is cut off by the blanking machine according to the length of the push rod to be processed; and according to the electric heating push rod which is manufactured through the method, a sheet-type heating element of the electronic thermostat is arranged in the push rod, so that the heating element is prevented from deforming and being broken, and the service life of the heating element is ensured.