Product Introduction

The influence of the rapid development of China's industry on nodular casting

The rapid development of China's industry in recent years has also promoted the development of China's machinery industry, and the development of ductile casting as an important mechanical part of mechanical equipment is also very amazing. The casting of nodular casting is the main reason that affects the quality of nodular casting, if the casting is good, then the quality of the production of nodular casting is also very good, nodular casting is the metal smelting into the liquid that must be shown when pouring into the cast, after cooling and solidification, the application of some predetermined shape and size and performance of nodular casting process.

The hardness of nodular casting is too high after welding. Easy to breed cracks, thermal deformation. Due to the limitation of welding conditions, it is easy to breed secondary defects such as porosity and slag inclusion. The casting defects of nodular casting are mainly concentrated in the general situation of nodular casting or the pores, holes, cracks, pits and so on. The defects of pig iron, cast steel, alloy steel, stainless steel fine nodular casting, aluminum alloy pressed nodular casting and so on are commonly repaired by argon arc welding and electric welding machine.

This method is used to repair the general defects of spheroidal ink castings, and the repair place is the same hardness and color as the parent body, and there is no micro-crack, which meets the requirements of the Ministry of machinery industry. It has the advantages of simple operation, high repair efficiency and high economic benefit. It breaks through the conservative fusion welding repair process and is a new method to repair the general defects of bed ductile casting. A new repairing process for bonding the filler material with the base material by atomic diffusion method. 

Metal heat treatment of ductile casting is an important process in mechanical manufacturing, compared with other processing processes, heat treatment generally does not change the shape of the workpiece and the overall chemical composition, but by changing the internal microstructure of the workpiece, or changing the chemical composition of the surface of the cast iron platform and bed ductile casting, giving or improving the performance of the workpiece. It is characterized by improving the internal quality of cast iron platform and bed nodular casting.

Casting coke fuel is an effective way to improve the temperature and quality of liquid iron. Casting coke is used in most cupola smelting abroad. Due to the high price of foundry coke or due to habits and other reasons, most domestic enterprises still use metallurgical coke. Some enterprises even use coke, which not only affects the quality of ductile casting, but also the coke consumption is large.

For the better development of China's ductile casting industry, we should try our best to make the processing surface and processing base surface of the bed ductile casting placed in the same mold. In the machining process, the square head of the upper part of the bed ductile casting is used as the benchmark for turning the thread of the external surface, because the processing surface and the processing base surface are in the same upper profile, thereby reducing the insufficient processing allowance caused by the wrong box. Try to put most or all of the nodular casting in the lower mold, so that the main core can be placed in the lower mold, easy to place and test the core, but also to reduce the height of the upper mold, easy to close the box. It is the selection of the parting surface of nodular casting, which puts all nodular casting in the lower mold to avoid the wrong box and ensure the quality of nodular casting.

Zhongwei Precision has the following services

Detection Systems

Copper Silica Sol Investment Casting

We are the manufacturer of "600 slash/7 ductile iron parts", if you need more information please contact us!