The design and manufacture of large-scale, high-quality flat extrusion cylinders and large special profile molds are the key core technologies for the extrusion of large flat-width, thin-walled, high-precision and complex profiles. The main research contents and R&D characteristics of the project are:
1. Conducted systematic research, development, and innovation on the structure, design parameters, material selection, heat treatment, and surface treatment processes of large-scale special molds; designed and manufactured hundreds of large-scale and complex special molds for vehicles; With a pass rate of 70%, the design concept and mold repair technology are the first in China.
2. The finite-element special software and photoelastic experiments were applied to the self-developed flat extrusion cylinder. The stress strain field and temperature distribution of the large flat extrusion cylinder were systematically studied, and the structural parameters and failure of the flat extrusion cylinder were related. relationship. The shape and size of the inner hole have been optimized. For the first time, a large-scale, high-pressure, high-life, high-quality flat extrusion tube has been successfully designed and manufactured in China. The quality and service life have reached the world's advanced level, and the key to large-scale extrusion tooling design and manufacture has been solved. technology.
3. In the country for the first time, a three-component joint expansion joint type flat extrusion gasket has been developed and developed, which greatly improves the reliability and production efficiency.
The 105 sets of aluminum alloy profile extrusion dies for large vehicles designed and manufactured by itself have excavated more than 1,000 tons of qualified vehicle profiles. Completely replaced imports.
After the development and production of the flat extrusion tube, it has been used for the production of flat wide aluminum alloy vehicle profiles. The use of a good temperature control, the metal throughput has reached more than 5,000 tons.
The use of a fixed extrusion pad reduces the time required to change the gasket during the extrusion process, which not only improves the production efficiency but also reduces the labor intensity of the workers.
Applying the results of the research and development of the extrusion tool and die, the company has produced more than 100 varieties of large-scale aluminum alloy profiles with a total output of more than 5,000 tons and an output value of approximately 200 million yuan. The product quality is stable, meets the requirements for the manufacture of aluminum alloy rail vehicles in China, fills domestic gaps, reaches the advanced level of similar international products, and achieves good economic and social benefits.
A pipette, also known as a pipette gun, is a device used to quantitatively transfer liquids. When conducting research in analytical testing, a small or trace amount of liquid is generally removed with a pipette. Pipettes can be divided into gas piston pipettes (Air-displacement pipette) and external piston pipettes (Positive-displacement pipette) according to the principle. Gas piston pipettes are mainly used for standard pipetting, and external piston pipettes are mainly used to handle special liquids such as volatile, corrosive and viscous. Many people ignore the correct use of pipettes and some of the details.
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