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The domestic precision casting products are faced with the problem of good policy analysis

Author:Wansheng Casting  View:566  Date:07/06/2014
The personage inside course of study analysis, precision casting products in our country at present the three problems. Environmental problems of the foundry industry of our country in excessive consumption of natural resources. The above shows that the precision casting industry in our country environment problem severity, using high technology to realize green casting is the key to solve the need to focus on the current problems.
A, craft level is low, poor quality of precision casting products 1, casting crack problems.
2, large casting defect serious segregation and inclusions.
After the large steel castings and large steel ingot solidification, the riser root exists, casting of heavy section macro segregation, coarse grains.
3, simulation software application is not widespread.
Casting process simulation is a necessary link in casting production, in a foreign country, if there is no computer simulation technology, it can't get the order. Computer simulation of casting industry in China started relatively early, while the core computing part development ability is stronger, but the overall software package ability is poor, lead to the commercialization of the mature software development is far behind the developed countries, quite a number of foundry enterprises of computer simulation technology, the lack of trust. Now the situation is improved, but on the casting simulation software in the enterprise, also can play the role of rare, be badly in need of software application training of enterprise staff.
4, the common casting of excess production capacity, high precision casting manufacturing is still difficult, core technology and key products still rely on imports.
5, precision casting, machining allowance. Because of the lack of scientific guidance design, process design personnel on experience is difficult to control the deformation problem, casting machining allowance in general 1 to 3 times larger than abroad. Machining allowance is big, the energy consumption of the castings and raw material consumption, processing cycle is long, the production efficiency is low, has become the bottleneck which restrict the development of the industry.
6, gating system design is not reasonable. Due to the improper design, such as volume gas and inclusion defects, lead to casting production rate and qualified rate is low.
Second, the serious environmental pollution, bad working environment with a few large enterprises in China such as faw, no.2, big big heavy, shenyang liming company production equipments, advanced precision casting technology, such as environmental protection measures in place, the basic point most foundry production obsolete equipment, backward technology, general rarely consider environmental protection issue.
In the 1980 s, the government of small scale, low technical level and polluting enterprises have adjusted their specialization, raised the intensive degree of the enterprise, but the rough characteristics of casting production have no fundamental change.
Environmental problems of the foundry industry of our country in excessive consumption of natural resources.
Three, energy and raw material consumption high precision casting industry in China's energy consumption accounts for 25% of the total energy consumption of mechanical industry - 25%, the average energy utilization rate is 17%, energy consumption is approximately twice the casting in the developed world.
Qualified castings per production 1 ton of energy consumption in China for 550-700 kilograms of standard coal, abroad is 300-400 kilograms of standard coal, the energy consumption of the production 1 ton per qualified steel is 800-1000 kilograms of standard coal, abroad is 500-800 kilograms of standard coal.
According to statistics, material and energy in the process of casting production output value accounts for about 55% to 70%. China casting gross weight than the average 10% to 20% higher than that of abroad, steel casting process product rate is 55% on average, foreign can reach 70%.
Casting furnace charge is mainly in the production of pig iron, scrap steel, coke, limestone, sand and core sand, etc. Mainly is the original sand, clay, coal powder, resin binder, curing agent, such as transportation, sand, sand molding, core making, baking, melting, pouring, cooling, shakeout, cleaning, pretreatment and post-treatment in terms of its job content is in mechanical vibration and noise, some still work in high temperature melting, pouring, some have excitant odour, dust in the working environment is bad.
The above shows that the precision casting industry in our country environment problem severity, using high technology to realize green casting is the key to solve the need to focus on the current problems.

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