The development process of domestic common cylindrical spring coiler is reviewed, and the current development status is summarized. It fully affirmed the great contribution of equipment manufacturing enterprises in the spring industry in promoting the industry to enter the process of mechanization and computerization. Compared with the development of the same industry in foreign countries, the deficiencies of the domestic industry were found. I also put forward my own view on the future direction: that is, we can first imitate and narrow the gap, accumulate experience, and then innovate to catch up. One family's words are for reference only.

On the current situation and development direction of China's spring coiler industry
1. Development process and current situation of spring coiler industry
Before the reform and opening up, China's spring industry was limited by the development of domestic manufacturing industry, with a small overall scale and low technical level. In addition to the introduction of some foreign equipment by a few military enterprises, most enterprises add spring by manual and semi-mechanized means. The automatic spring coiling machine (Z53 series) produced by Luoyang Machine Tool Factory represented the highest level of domestic spring coiling equipment at that time, and many manufacturers were not able to equip it. At that time, the wire diameter of the Z53 series spring coiling machine was able to cover 1~14mm, basically meeting the domestic demand for spring production. Although it was only used by some powerful state-owned enterprises, it also marked that the production of China's spring industry has entered the period of mechanized production from manual and semi-mechanical mode.
After the reform and opening up, due to the rapid development of light industry, electronics and other industries, the demand for light small wire diameter springs has increased, and the quality requirements have also been higher. The precision, efficiency and wire diameter range of Z53 series can no longer meet the market demand. Luoyang Machine Tool Factory introduced three types of mechanical spring coiling machines of FS series from the former WAFIOS company of West Germany in the mid-1980s. The wire diameter is from 0. 1 to 3mm, and its precision and efficiency are far higher than the Z53 series. It is the most popular model in the market, with a total sales of nearly 1000 sets.
Later, due to the increase of motorcycle production, the demand for its damping spring and valve spring was huge. Luoyang Machine Tool Factory introduced two models of CML series from Japan Aoye Machinery Manufacturing Institute (Zhuzhou) in the 1990s, with the maximum wire diameter of 5 rmi and 8 mm respectively, which fully met the demand of domestic motorcycle industry for spring at that time.
These two successful introductions have shortened the gap between China and the world's advanced level, and also represented the advanced level of domestic mechanical spring coiler at that time, which has basically been in the same period with foreign technology, without generation difference.
With the rapid growth of the domestic economy, China's manufacturing industry has also developed rapidly. In particular, the automobile industry has maintained a double-digit growth rate, and finally won the world's first place in 2010 with the outstanding performance of producing and selling 18 million [2] vehicles. Of course, on the one hand, the traditional power of the automobile industry, the United States, has not recovered from the financial crisis; on the other hand, it also shows that China has made great progress in the field of traditional manufacturing.
The rapid development of the automobile manufacturing industry has an obvious pulling effect on the spring industry. The domestic spring industry has entered a very rare golden period of development. Spring manufacturers in several important regions in China, relying on the development of the automobile industry in the wood region, have expanded production capacity and updated equipment. The market for the production equipment of suspension spring and valve spring, the landmark products supporting the automobile industry, has always been in strong demand. This also brings excellent development opportunities to domestic equipment manufacturers.
First of all, by means of introduction, digestion and absorption, we have produced a coil spring machine which is directly monopolized by foreign products and adopts AC servo motor computer numerical control. Then not only will the wire diameter range be up to 20 mm, but also the number of computer-controlled axes be increased from 2 to 5, 6 and more axes. Although there is still a gap between the products of domestic manufacturers and foreign products, they can also meet the requirements of the vast majority of domestic manufacturers and have obvious price advantages. Not only has China's spring industry popularized the use of computer spring coiling machines in a very short time, but also has greatly lowered the price of overseas products in China. Take the 20mm 5-axis servo computer spring coiler produced in Taiwan, the largest sales volume in the domestic market, as an example. The price has dropped from 2.6 million yuan/set at the initial stage to 1.7 million yuan/set at present, with a drop of more than one-third, but the price is still higher than the domestic m0.
In the mid-1990s, there were only four or five computerized spring coiling machines capable of producing large wire diameter (more than 16 nun) springs in China, which were distributed in state-owned enterprises in Shanghai, Tianjin, Shandong and other places, and were basically foreign brands such as Kouben and Germany. At present, domestic spring manufacturers have more than 70 sets of such equipment, and more than half of them are produced in Britain and China. At the same time, the domestic equipment of common models with the wire diameter of 3-8 mm has occupied most of the market share, accounting for more than 85% of the market by the number of sets, and the import of foreign equipment is decreasing. At present, three major production bases of computer spring coiling machines have been formed in Luoyang, Henan, Zhejiang and Guangdong, while the output in other regions is relatively low.
Domestic spring coiling machine manufacturers, which rely on private enterprises, have made great contributions to the localization of computer spring coiling machines, and have cultivated a large number of technical personnel for product design and commissioning while achieving better economic and social benefits, laying a good foundation for the future development of this industry.
However, the core technology of the computer spring coiling machine is the operating system. At present, domestic enterprises do not master this part of technology. All manufacturers purchase from outside. Most of them use Taiwan's operating system. Because of the need of competition, they will obviously not sell the most advanced operating system to the mainland. The gap between operating systems will inevitably affect the performance of equipment. Even if the hardware is identical, this problem is still the bottleneck of domestic industry development.
In the era of information technology explosion, many domestic companies have developed practical operating systems in the field of general equipment in the machine tool industry, which has helped the domestic equipment to step up to the stage of computerization. Only in the field of spring coiling machine, there have been no domestic enterprises involved in system development. I wonder whether the information communication is not smooth or the cake is underestimated. We have reported this issue to the higher authorities through the Association for many times, but there is still no change at present.
The operating system is controlled by others, which makes domestic products unique and less distinctive, and is easy to enter the vicious competition of price competition. This is very unfavorable to the development of the whole industry.
2 Outlook on the future development direction
The places and countries with high technical level of spring coiling machines abroad include Germany, Sweden, H-Ben and Taiwan.
Due to the continuous integration of the latest scientific and technological achievements, the products are becoming more and more perfect, with various characteristics and functions.
First, the operating system has realized human-computer dialogue and 3D imaging. The sample debugging of labor-intensive, time-consuming and costly materials is completed in the operation field 1, which not only improves efficiency, but also benefits. The high-performance operating system can control the twelve axes. It is convenient to expand the function of the device. (For example, the change of left and right rotation, the adjustment of screw pitch, and the change of cutting mode are very simple. In order to control the spatial shape of the product, you can also add "spring winding finger" on the equipment at will. The high-precision and ultra-stable release spring coiling machine is also a highlight of foreign spring coiling machines. Some special products with wire diameter less than 0.1mm can not be produced by domestic equipment, resulting in the extremely high price of such equipment, and the equipment weighing hundreds of kilograms will be sold for millions of yuan.
When carbon emission has become a global topic, emission reduction has also become the design concept of spring coiler: reduce power consumption as much as possible, and store the energy generated by reversing, parking and other braking during the working process of the equipment. There have been successful application examples abroad.
By comparing the advanced technology of foreign countries to find out our own shortcomings, we have the direction of development. In 2011, according to the market characteristics and equipment status of China, the General Parts Association Council put forward the development idea of "specialized, refined and special". It is to use special equipment instead of universal ones to reduce costs and consumption. Develop its own high-precision and ultra-stable products; According to the development needs of special industries, we can produce equipment that can meet the market demand.
We have completed the mechanical to computer upgrade in a very short time, and we are also able to catch up and narrow the gap with the world's advanced level in a short time. The rapid development of China's high-speed rail and rail transit industries, as well as the emerging new materials, new processes and new technologies, make us face a good development opportunity. The initial imitation also accumulates energy for future innovation. Let's make unremitting efforts to contribute to the development and progress of this industry. We also call on relevant industries to give us strong support.