What Is Near Net Shape?

Near-net-shape casting is a series of near-net-shape high-quality rheological casting technology. It is based on non-Newtonian rheology and solidification theory, with effective control of solidification behavior and rheological behavior as the core of the technology. Cast new technology.

Near-net-shape casting is based on the good rheological properties of the alloy melt.

In the past 30 years, precision forming technology has developed at a rapid rate abroad. A large number of high-quality, efficient, and non-cutting new forming and modification technologies have been developed and widely used in industry, such as gasification mold casting, resin self-hardening sand core modeling, and other near-net-shape casting technologies; superplastic forming, Precision hot forging, precision cold temperature forming, etc.

1.Development of forming accuracy towards net forming

The current precision forming technology has realized near-net forming to a large extent, that is, manufacturing workpiece blanks close to the shape of the part, which reduces the amount of cutting in the subsequent process and reduces the consumption of materials and energy compared with the traditional forming technology. The development trend is to achieve net forming, that is, directly to make workpieces that meet the shape requirements. According to the International Machining Technology Association, in the early 21st century, the combination of plastic forming and grinding will replace most of the small and medium-sized parts.

This project technology is a very versatile material forming technology, which has broad market prospects in the production of various important parts such as automotive parts, military aerospace parts, rolling stock parts, anti-wear parts, power accessories, etc.

The locomotive and vehicle parts in the field of automobile and rail transportation are developing in the direction of light weight and green. One of the key ways of light weight and green is to improve the material performance level. The rheological series technology provided by this project can provide the technology support.

The precision casting mold cooling system developed by Beijing Jinjingxing Precision Casting Research Institute has technically shortened the time for precision casting mold parts to wait for demolding in the production process, which has significantly improved production efficiency. Due to the control function of the electronic temperature controller, the cooling time and temperature can be scientifically controlled according to the process conditions, which improves the quality of precision casting mold parts.

In the production process of precision casting mold products, mold cooling is one of the key factors affecting product molding. At present, most countries use natural cooling or medium (water) cooling. The medium (water) cooling system usually uses water to cool the upper and lower shells and cores. The heat brought by the working materials in the production is taken out of the mold by the cooling system. To ensure the normal work of the mold in production and good quality of precision casting mold parts. In the production process, since the time required to wait for the mold temperature to reach the expected range, that is, the demolding time is very long, the cooling efficiency of the mold directly affects the production efficiency of precision casting molds. The current precision casting mold cooling system, for aqueous media, The temperature cannot be controlled, and the temperature range and cooling time of the mold cooling cannot be controlled.

The "Cooling System for Precision Casting Mould" developed by Beijing Jinjingjing Precision Casting Research Institute has technically shortened the demolding time and provided favorable conditions for precision casting mold parts.

The turbocharger body is the most important component of a turbocharger system. In practical applications, the material, speed, and air flow path of the turbine blade determine the effect of stable turbocharging. Turbocharging is widely used in various industrial fields. Generally speaking, the turbine only produces utility in the middle speed range. The efficiency of turbocharging is not obvious at low speeds. This phenomenon is called turbo lag. Because the baffle ribs on the turbine blades are evenly distributed, the turbine blades generate air vortices during the rotation process. In the prior art, the turbine blade airflow output channel is narrow, which creates turbulence obstruction and affects the rotational speed and supercharging effectiveness.

Beijing Jinjingjing Precision Casting Research Institute developed a new type of turbine blade, which technically reduces the airflow obstruction caused by the turbine vane baffle, which makes the airflow friction smaller, reduces the turbine lag, and has a better turbine response.