Process for manufacturing reduction shell

Abstract

The invention discloses a process for manufacturing a reduction shell. The process comprises the following steps of: A, manufacturing a precision aluminum die; B, injecting liquid paraffin at a certain temperature into the die through a paraffin injector so as to obtain a paraffin die; C, repeatedly performing coating and sand drenching on the paraffin die, and hardening the profiled shell and drying; D, dewaxing to obtain a cavity; E, roasting the profiled shell; F, smelting molten steel by using a middle-frequency sensing furnace; G, pouring the molten steel into the roasted profiled shell; H, removing the profiled shell, cutting away the casting head, clearing the sands and polishing so as to obtain a blank; I, performing corresponding thermal treatment on the blank; and J, machining the blank so as to obtain a high-precision product. By the adoption of a silicon sol precision steel casting technology, the appearance of a workpiece is flat and smooth, so polishing is not needed; and the reduction shell has high strength, plasticity and flexibility. The shortcomings that the products in the same type are easy to crack and cannot be repaired and the size precision cannot be guaranteed are basically overcome; therefore, trucks are safer and more stable and reliable under the condition of a heavy load.

Description

Technical field [0001] The invention belongs to the field of automobiles, and in particular relates to a manufacturing process for shell reduction. Background technique [0002] At present, there are many domestic and foreign manufacturers of shell reduction, and the production of shell reduction by each manufacturer is similar, and the structure looks similar, and they are all made of ductile iron. Due to the high carbon content and poor plasticity of ductile cast iron, its mechanical properties and weldability are poor, and it is prone to defects such as cracks and oil leakage during use. Due to the poor welding performance, it is easy to form continuous wide white and hardened structures after welding, the tendency of cracks is large, and the surface hardness is too high, so some products with cracks cannot be repaired. In order to solve a series of shortcomings such as poor plasticity and difficult welding of cast iron, other improved production and processing technique...

AI Technical Summary

Problems solved by technology

Due to the high carbon content and poor plasticity of ductile cast iron, its mechanical properties and weldability are poor, and it is prone to cracks and oil leakage during use.

Due to the poor welding performance, it is easy to form continuous wide white and hardened structures after welding, the tendency of cracks is large, and the surface hardness is too high, so some products with cracks cannot be repaired

In order to solve a series of shortcomings such as poor plasticity and difficult welding of cast iron, other improved production and processing techniques must be explored