Recently, the reporter encountered an old expert who has worked in the field of automotive industry equipment for a long time. He told reporters that the rapid development of China's automobile production and sales in recent years has also promoted the rapid development of foreign related machine tool industry, while the domestic major equipment special prospects are not optimistic. The reporter learned that the national science and technology major project is a major strategic product, key common technology and major project completed within a certain time limit through the breakthrough of core technology and resource integration in order to achieve national goals. The 16 major special projects, such as large aircraft and CNC machine tools, as defined in the National Medium- and Long-Term Plan for Science and Technology Development (2006~2020) are the top priorities of China's science and technology development by 2020. It can be seen from the basic principles of major special projects that cultivating a strategic industry that has core independent intellectual property rights and has a significant impetus to the improvement of independent innovation capability of enterprises, and has a overall impact on the overall improvement of industrial competitiveness. Strong key common technologies and solving major bottlenecks that restrict the industry are the outstanding problems that are currently being solved. In the “04 Major Projects†on high-end CNC machine tools and basic manufacturing technologies, it is proposed that the key content and objectives of the key implementation during the “Eleventh Five-Year Plan†period are to develop key high-precision CNC machine tools and basic equipment needed in the automotive industry. Break through a number of CNC machine tool basic technology and key common technology, establish a numerical control equipment research and development platform and talent training base to promote the development of high-end CNC machine tools. The original intention of the state to set up major science and technology projects is to strengthen independent research and development capabilities and reduce the import of high-end equipment to promote the all-round and all-industry chain of China's automobile industry from products to equipment. However, since the implementation of major special projects in 2006, according to the reporter, in addition to a few domestically produced automobile equipment such as automobile painting can compete with imported products in the market, most of the key equipment in various fields of automobile manufacturing still need imported products. Come to "escort." Even if some domestic brands can meet the technical requirements of enterprises, due to the gap between reliability and production consistency, or just the gap between brands, quite a few domestic enterprises only dare to use imported equipment, and dare not use domestically produced Equipment, in order to ensure an orderly production cycle in the safest and most effective way. In fact, some of the domestic automakers and parts companies that have been visited by reporters in recent years have indeed seen the production lines of most local brand enterprises mainly imported equipment, especially the key processes and testing and measurement equipment. This is the case. The reporter recently interviewed a county-level city in Liaoning Province and found that several local private enterprises that mainly produce automobile superchargers also use imported equipment. In a newly expanded factory building of a large private enterprise, the reporter saw a flexible production line consisting of all kinds of imported processing centers. Of course, even in the production line that is “submerged†by imported equipment, domestically produced equipment will still be seen from time to time, and some self-owned brand automobile factories even use domestic equipment throughout the entire line, but the responsible persons of these related enterprises do not use this. To be proud, the psychology is very complicated: if the funds are not tight, the factory will not buy so many domestic equipment. In today's vigorous promotion of independent innovation, the quality of independent brand automotive products is closely related to the level of its manufacturing equipment. Just like letting consumers buy their own brand cars, letting all kinds of enterprises, including self-owned brand car manufacturers, purchase domestic equipment must also give people a sufficient reason. This reason may not only be quality and reliability and stability, but also It should include long-term and lasting quality services in the future. The reporter recently interviewed a local parts and components company and saw a device developed by a domestic university in the most critical process on the production line. However, it is understood that this is only a prototype and has not been industrialized. The reporter learned that some of the major projects have already “passed throughâ€, but most of them are still far from the real industrialization. 2020 is the time point of the national science and technology major project. During the remaining less than two five-year planning period, the relevant state departments are organizing their forces and strive to achieve greater breakthroughs in the major projects of CNC machine tools, so that China’s high-end equipment can truly To achieve industrialization, China's equipment manufacturing enterprises have become the main force of China's automobile industry.
Hex Bolt
Hexagon Bolt refers to the fastener composed of head and screw. According to the material, the bolt can be divided into iron bolt and stainless steel bolt, namely hexagon head bolt (partial thread) - C grade and hexagon head bolt (full thread) - C grade.
1. According to the stress mode of the connection, there are common and reamed holes. The bolts used for reaming holes should match the size of the holes and be used when subjected to transverse force
2. According to the head shape, there are hexagon head, round head, square head, countersunk head and so on. Generally, countersunk head is used in the place where the surface is smooth and no protrusion is required after connection, because countersunk head can be screwed into parts. Round head can also be screwed into parts. The tightening force of square head can be larger, but the size is large. Hexagon head is the most commonly used.
In addition, in order to meet the needs of locking after installation, there are holes in the head and in the rod, which can prevent the bolts from loosening when they are subject to vibration.
Some bolts have no thread of smooth rod to do thin, called thin waist bolt. This kind of bolt is conducive to variable force connection.
There are special high strength bolts on the steel structure. The head will be bigger. The size will also change.
In addition, there are special uses: T-shaped slot bolts, most of which are used in machine tool fixtures, with special shape, and both sides of the head need to be cut off. Anchor bolts are used to connect the machine and the ground, and there are many shapes, such as U-shaped bolts, and so on.
There are also special studs for welding, one with thread and the other without thread, which can be welded on the parts, and the other side can directly screw the nut.
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