The influence of the vibration field of the Shan Machinery on the solidification and crystallization of the cast alloy ç¿Ÿ Li Minç¥ Rui Hong弋 Zhang Jinsong; 1. Taiyuan Water Supply Company, Shanxi. Taiyuan 030009, 2. Technical School of Taiyuan Iron and Steel Co., Ltd., Taiyuan 0300023, China. Institute of Boiler and Pressure Vessel Inspection in the State of Zhangzhou, Shuozhou 034000, Shanxi, China. The traditional process that is currently used in production is ingestion of liquid metal, essentially. Breeding mainly affects the nucleation process. This evening. Casting hunger refinement.
It is also possible to increase the cooling rate. The purpose is to provide the chilling capability of the cast-in-a-metal molds so that the metal liquids within the mold will quickly nucleate at large. In the month of grain refinement, in 1994, we adopted the method of vibration field in the process of solidification of the castings. We tried to refine the group through the physical method. Gray iron in stone difficult size and distribution. It can improve the size and distribution of the carbides in the crucible and make it possible to refine the grains and improve the mechanical properties.
1 Experimental contents and methods 1.1 Experimental device Vibration experimental device A winter sample 1 sample 2 vibration table of the motor mining Yes. Type 2124. Power 0.8 gray. Asynchronous motor mounting spring with a speed of 138 is. In order to make the vibration of the vibration table become an excited periodic vibration. The vibration force of the vibration table is adjusted by changing the weight of the weight of the weight.
1.2 Fundamentals The motor rotates. Emphasis is placed on the impact force of the metal clamped on the sample cup on the rotary table, thereby changing the solidification and crystallization process of the metal.
1.3 Smelting equipment and temperature control equipment Smelting equipment is an ordinary medium frequency induction furnace, power 10, temperature control equipment for tungsten tungsten 5 tungsten 铼 20 thermocouple 8 vibration table; 9 base level adjustment screws, base graphite type; 1 water glass type 1.4 The contents of the experiment included mortar gray iron 150 and high chromium white cast iron containing 17.
1 phenol, 2 helium at the same casting temperature the same casting mold Received date 200073 1968, male, Quzhou City, Shanxi Province, engineer, undergraduate, vibration from weak to strong on graphite flakes, and dendrite dendrites distribution morphology and carbides The effect of distribution patterns.
2 Experimental results and analysis 21 High-chromium white cast iron When the casting temperature is 160 °C, the high-chromium white cast iron vibration experiment metallurgical structure 3 is static, water glass sand type; micro-vibration, sand type; strong vibration, sand type, 3 is When the static high-chromium cast iron does not vibrate, the microstructure of the high-chromium white cast iron is divided into relatively regular distributions of the austenite white branches. The carbides are arranged in a lamellar or semi-meshed shape with no gaps. Carbide, the above result shows that the vibration field has a significant refinement effect on the carbides in the high-chromium white cast iron, thereby improving the impact toughness and anti-wear performance of the alloy 22 The gray iron 50 is improved.
The old when the casting temperature 1350, a small experiment of 150 vibration experiments of the metallurgical structure, standing, graphite type; 1 micro-vibration, graphite type; 0 strong vibration, graphite fast, the sample cooling speed, so that the sample layer appears A small amount of white mouth. In all cases, graphite flakes are long and thick, and there are a few clumps of graphite.
Small graphite clumps or knob-like graphite appeared.
Species in the form of very fine graves and particulates appear as small graphite pellets. From the total graphite distribution, there is a diffuse distribution with 1 result, and the vibration field clearly shows the fineness of gray cast iron graphite flakes. The effect of rejection refinement is closely related to the vibration force. ! Also gradually, and tend to diffuse 3 Conclusions In the vibration field, liquid metal will move up and down due to inertia, making it a factory boiling feet. The upper and lower scouring effect of the corpse gold flexes and breaks the branches of the elders, creating new fine grains. On the other hand, the up and down movement of the liquid metal increases the degree of supercooling, which helps the plant to form new ones. Crystal cores In summary, the vibration field can improve the shape and distribution of hard rock in the gray cast iron, which can improve the morphology and distribution of carbides in the high lattice white cast iron and the fragmentation of the austenite dendrites, thus making the cast alloy The organization has been refined to achieve the purpose of improving the mechanical properties.
The test shows that the vibration frequency has no obvious effect on the grain refinement, but the magnitude of the amplitude has a great influence on it. The best vibration moment is the initial stage of solidification.
The effect of vibration field on the crystallization and properties of cast alloys. With all 77 research work done, the research and development stage is still on the whole. This experiment is also full of exploratory experiments. Through experimental research, the influence of vibration field on grain refinement is analyzed. Whether there is a set of rules to follow, to provide a theoretical basis for future application in production.
Hao Shijian. High-chromium wear-resistant cast iron PCT. Beijing Coal Industry Press, Li Qingchun. Casting forms the theoretical basis of PCT. Beijing Machinery Industry Xu Lin. Non-electricity electricity measurement technology in casting. Beijing China Science and Technology Feng Shi. Influence of rotating magnetic field on segregation formation of cast alloys.
Lu Wenhua. Cast iron and its melting elbow. Beijing Machinery Industry Press, Ying Xuan Abstract Page 48 There are axial and pair motions, soil is destroyed by slide tearing to achieve the purpose of reducing power consumption; using the same blade to cut the soil in order to avoid the process of dumping The middle blocks collided with each other and they were successfully turned and thrown in order to improve the tillage quality. The inclined row spinners adopted the working principle of the rake type plough + ploughing performance. The drive disc plough was used to slide and cut the torn soil and discs were discarded. The other side has the advantages of low power consumption of the ploughed soil, and retains the good performance of the soil of the rotary cultivator, the blade material is less than the drive disc plow, and is manufactured to have the characteristics of low water. Dr. Kong Lingde pointed out that the slanting rotary cultivating test of slanting rotary knife is a kind of new tillage tool that combines the features of plowing and rotary tilling, low power consumption, and good farming quality, and is expected to be popularized in the future. 4!
Prospects of research on rotary cultivators There are two hot spots in the research of rotary cultivators. One is the strategy for sustainable development proposed by the country this year. Reducing pollution and reusing resources has become the ultimate goal of current agricultural machinery design. Returning straw to the field is undoubtedly a Important research directions have seen the use of new villages such as reversible smashing cultivators and rotary cultivators to promote human sheds. For example, the Taiyuan North Suburb Vegetable Office has proposed a lot of preferential policies to suck 4 vegetable farmers to use greenhouses. The development of small-scale human shed machinery has become a pre-research, and it has been reported. 1 4 has developed a small rotary cultivator weighing only 8.6 kg, women can make dumping, Sang is. Nongkenji Cheng Xue 1 on 1. North. , National Agricultural Machinery Press, 1987.
2 Kong Lingde, Zhang Chengcheng. Research Status and Prospect of Rotary Knife Cutters . Jiangsu 3I Sang Zheng 1. Ditch soil reversal cultivator research, look. 1. Agricultural 14 hole Ling. Development of Oblique Rotational Tillage Tester 1. Taiyuan Heavy Machinery, Continued on page 43 Previous Page 45