Casting production process and device for boron cast iron cylinder liner

Abstract

The invention belongs to the technical field of diesel engine part processing, and particularly relates to casting production process and device for a boron cast iron cylinder liner. The casting production process for the boron cast iron cylinder liner comprises the steps of adding pig iron, ferrochrome, ferromanganese and part of waste steel into a medium frequency furnace for smelting, and slagging off; then adding ferrophosphorus, ferroboron, copper, silicon carbide and residual scrap steel, stirring, smelting, taking a sample for laboratory test, and tapping when the base iron requirementis met; adding a nucleating agent, stirring, and slagging off to obtain a casting solution; and molding: adopting a furan resin sand mold for making a core, horizontally parting, using the casting solution for vertically casting six pieces in one box, and obtaining a finished product. The casting production device for the boron cast iron cylinder liner comprises a sand box and a sand core, whereina sprue, an ingate and a cross gate are arranged in the sand box; and an air outlet hole is formed in the side wall of the top part of the sand core. According to the casting production process and device for the boron cast iron cylinder liner provided by the invention, one box includes six pieces, so that the cost can be saved, the production efficiency is improved, and the product quality is improved; and the wear resistance of the manufactured boron cast iron cylinder liner is greatly improved, and the cost is reduced compared with a niobium cylinder liner.

Description

technical field [0001] The invention belongs to the technical field of diesel engine parts processing, and in particular relates to a casting production process and device of a boron cast iron cylinder liner. Background technique [0002] Existing cylinder liners of diesel engines are currently made of niobium alloys. At present, niobium alloys have the following deficiencies: 1. Market response is poor in wear resistance. 2. The hardness of the body is low, and the average hardness of on-site testing is 172.5HBW. Boron alloy cylinder liners are widely used in the market now, but they are generally centrifugal casting. The high hardness of the body can basically reach more than 200HBW. The hard phase of the body structure is distributed in a discontinuous network. %-10%. However, the cost of centrifuge equipment is large. Considering that the actual production volume of some companies is not too large, in order to save costs, intermediate frequency furnace equipment on si...

AI Technical Summary

Problems solved by technology

At present, niobium alloys have the following deficiencies: 1. The market response is poor wear resistance

2. The hardness of the body is low, and the average hardness of on-site testing is 172.5HBW

Cast iron smelting process, induction furnace smelting without pretreatment agent has its own problems, such as: large whitening tendency, degree of graphitization does not meet the requirements, graphite shape is poor, even if the furnace charge ratio remains unchanged, the composition of the original molten iron It is difficult to maintain the stable performance of cast iron under the conditions of meeting the requirements and the same molten iron temperature

The traditional resin sand casting cylinder liner generally uses two pieces in one box, which has low production efficiency and takes up a lot of space

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