Milling-rod production method

Abstract

The invention relates to a production method of a frotton and includes the following steps: a finished product of round steel is laid off; a charge bar is transferred by a roller table which consists of a plurality of parallel rollers which rotate at a uniform speed in the same direction and a V-shaped flute is arranged on the circumferential surface of the roller; all the rollers are obliquely arranged at the same horizontal plane, and the charge bar is arranged in the center back of the flute and the axial line of the charge bar and that of the roller are not vertically crossed; when the rollers rotate, a moving component of force and a rotational component of force are produced to cause the charge bar to rotate around the axial line thereof while advancing on the roller table; the charge bar is transferred by the roller table to a box type heating furnace to be heated to 850 to 900 DEG C and water from the periphery of the charge bar is sprayed for sprinkling and quenching; after the surface of the charge bar is naturally cooled to the ordinary temperature, the charge bar is sent to a box type tempering furnace to be heated to 250 to 300 DEG C for thermal refining, and naturally cooled; the frottons with straightness accuracy which does not meet the requirements are put into a pressing machine for straightening adjustment. The method can guarantee the uniformity of heating and hardening temperature with little bending deflection after the heat treatment and can improve the quality and yield of products.

Description

technical field [0001] The invention relates to the technical field of ball mills, in particular to a method for producing grinding rods used in ball mills. Background technique [0002] Grinding rod is a new type of abrasive material, which has been used in new ball mills in recent years with serious wear and large consumption. At present, the new ball mill using grinding rods has been widely used in metallurgy, building materials, cement, mining and other industries. [0003] At present, in the production process of grinding rods, the method is to heat them in a well-type electric furnace and then put them into water for quenching treatment. During the transportation and heating process, the material rods only move in translation and do not rotate. After heat treatment by this method, the material bar has large bending deformation and uneven hardness; the hardness deviation at both ends of the same grinding bar or at different positions on the front and back sides is very...

AI Technical Summary

Problems solved by technology

After heat treatment by this method, the bending deformation of the material rod is large, and the hardness is uneven; the hardness deviation at both ends of the same grinding rod or at different positions on the front and back is very large

Because the heat-treated material has good strength and elasticity, it is difficult to straighten the grinding rods heat-treated in a well-type electric furnace. It needs to be repeated several times, or even more than a dozen times. Or less than 1 / 1000mm quality standard

At the same time, this heat treatment method is labor-intensive and has high production costs.

Images