Standard machining allowance

Standard machining allowance

For processing of qualified parts, machining thickness must be cut from the rough layer of metal, called allowance. Allowance can be divided into step margin and total balance. A step that needs to be cut in the thickness of the metal layer, called the allowance process. From the rough to the finished product a total resection margin, called the total margin, equal to the corresponding surface of each step and the remainder.

Purpose machine tools left on the workpiece allowance is to be cut on a process of processing errors and surface defects left, such as chilled casting surface layer, porosity, sand layer, scale forgings surface decarbonization layer, the surface cracks, internal stress layer after cutting and surface roughness. Thereby improving the accuracy and surface roughness of the workpiece.
The size of the allowance has a greater impact on the processing quality and production efficiency. Allowance is too large, not only increase the amount of labor machining, reduces productivity, and increased materials, tools, power consumption, and improve the processing costs. If the allowance is too small, we can not eliminate the procedure of various defects and errors, it can not compensate for clamping errors this step during processing, resulting in waste. Its principle is selected in the premise of guaranteeing quality, so that the smallest possible margin. In general, the more finishing processes margin smaller.
Find the development of China's construction machinery remanufacturing industry Road
Our equipment manufacturing and consuming countries, major construction machinery reserve amounted to 300 million units, a lot of equipment overload, is about to enter retirement peak. Faced with a huge product ownership and a large number of discarded equipment, to develop construction machinery remanufacturing has become an important choice for sustainable development of construction machinery industry strategy.
Remanufacturing is to let the old equipment renewed vitality process. It is the old machinery and equipment for the blank, using a special process and technology for a new manufacturing manufactured on the basis of original and re-manufactured products both performance and quality are inferior to the original new products, it makes a lot of waste construction machinery products have a new life, which can be regarded as a reincarnation of construction machinery of life. Development of the industry is advocated by President Xi Jinping "rigorously enforce thrift, oppose extravagance and waste" The best proof in construction machinery manufacturing industry.
Enter 2013, save resources and reduce waste, which is not only the voice of each person, but also a social, rational development of a country should practice guidelines. The effective use of resources to achieve sustainable development, which is the current consensus reached by manufacturing countries in the world, the face of increasingly severe lack of resources and environmental pollution, the world in the development of a sustainable development plan, the implementation of green manufacturing technology. Construction machinery remanufacturing as an important part of green manufacturing has become an important choice for sustainable development of construction machinery industry strategy. What is a construction machinery remanufacturing
Remanufacturing term has long been popular in Europe, but for China is still a new term is not known to the public, "What remanufacturing, not that second-hand equipment refurbishment it?" This is a lot of Chinese engineering machinery and equipment buyers questions. Now we have to explain in-depth look at what is remanufacturing.
In layman's terms, construction machinery remanufacturing is a large number of retired construction machinery demolition recycling, remanufacturing will have value as a retired parts remanufacturing product blank, use of surface engineering technology to repair such parts remanufacturing after and overall performance and service life have prototype parts and machine the same quality, the product obtained in the performance parameters, commitment to quality, service life, service, parts supply and new products in five areas to achieve the same level, it is retired construction machinery maintenance of high-tech industrialization. Machining remanufacturing costs are only 50% of new products, 60% of energy and materials 70%, the adverse impact on the environment is significantly reduced, effectively promoted the construction of a resource-saving and environment-friendly society, which is the development of remanufacturing largest industry significance.
Scientifically, remanufacturing is a waste product of the restoration and improvement of the implementation of the high-tech industry, it is directed to wear or to be scrapped parts, based on the analysis of performance failure, life assessment, analysis, re-manufacturing engineering design, using a series of related advanced manufacturing technology, the quality of remanufactured products meet or exceed new products.
Remanufacturing is the essence of repair, but it is not simple repairs. Remanufacturing core is the use of the manufacturing sector to engage in maintenance mode, a high-tech repair technique, and is an industry of the restoration, which is the advanced stage of the maintenance remanufacturing development, it is a kind of traditional maintenance concept upgrading and rewritten.
Advantages of construction machinery remanufacturing reflect
Construction machinery remanufacturing is an important part of advanced green manufacturing is one of the important options construction machinery industry sustainable development strategy. Initial experience from recent years, the construction machinery industry can be seen in the pilot remanufacturing remanufacturing benefit larger space, will be a new economic growth point industry; resource saving contribution of large energy, environmental protection effect is obvious; remanufacturing industry may become new employment growth; with Chinese characteristics is to build remanufacturing technology system, to enhance the international competitiveness of construction machinery products, the opportunity to achieve leapfrog development. Remanufacturing can not only extend the life of products, improve product performance and added value, but also that the product design, transformation and maintenance information, and ultimately to the lowest cost, minimal energy and resource consumption complete product life-cycle.

Compared with other industries remanufacturing carry out construction machinery remanufacturing has inherent, unique advantages: most of the heavy construction machinery and equipment, more large-scale structure, remanufactured and can more significantly save resources; higher value-added remanufacturing; structure is relatively simple, dismantling, cleaning, inspection, repair, easier to implement. Furthermore, the construction machinery products available surplus value is relatively high (According to related statistics, the utilization of old pieces of construction machinery products can reach more than 80%), so the development of construction machinery remanufacturing industry is of great practical significance and long-term strategic significance

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