Lap Joint Flanges (LJ Flanges) are used on piping fitted with lapped pipe or with lap joint stub ends the combined initial cost of the two items being approximately one-third higher than that of comparable Welding Neck Flanges.
Lap joint flange is having two components, a stub end, and a loose backing flange. Stub end is butt welded to the pipe and Backing flange freely move over the pipe. The backing flange can be of different material than stub material and normally of the carbon steel to save the cost. Lap flange is used where frequent dismantling is required, and space is constrained. Lapped Flange,Joint Flange,Lap Joint Flange,LJ Flange Shandong Zhongnuo Heavy Industry Co.,Ltd. , https://www.zhongnuoflanges.com
“The level of the machine tool industry essentially reflects the industrial level of a country.†Professor Yu Shengmei said, “CNC machine tools are called the working machine of high-end equipment manufacturing, but the demand for low-end machine tools in our country is still very large. It is obvious that the industrial level is not as developed in foreign industrial countries."
"The backwardness of the machine tool industry is caused by many factors." Yu Shengmei analyzed, "The technology of China's machine tool industry mainly comes from the help of former Soviet technicians in the 1950s and 1960s, but since then, due to issues such as treatment, The loss of researchers in the machine tool industry is very fast, and the cohesiveness is not enough. The long-term backwardness has caused domestic companies to spend more money to buy foreign products to meet their own needs. To change the current situation, it will take at least several decades to accumulate. ."
However, the huge demand of the machine tool industry is close at hand. "Research on machine tool related technology must be down-to-earth and take several years, but some companies are very short-sighted. I can’t wait to place an order this month. Effective, so they have chosen to buy foreign products instead of supporting domestic enterprises." Yu Shengmei said. Under such a background, a large amount of profits have been taken by foreign industrial developed enterprises. “Even if domestic enterprises have developed similar products and the same price, domestic downstream enterprises are still willing to choose foreign companies’ products, and feel that the technology is more mature and more secure. "Yu Shengmei said.
BOC International’s report also pointed out that as the world’s largest machine tool consumer, China’s high-end CNC machine tool industry’s self-sufficiency rate is seriously low, and there is a big gap between the design and development, materials technology, parts and components and the world’s advanced countries. . Benefiting from the national industrial policy, the huge demand of the downstream industry has won valuable development opportunities for China's CNC machine tool industry, “increasing consumption power and infrastructure construction caused by regional revitalization planning.†China's auto market and construction machinery are determined. The market will maintain good growth for a long period of time, which will determine the good prospects for the growth of China's machine tool market," BOC International said in the report.
The 4000 kN automatic high-speed precision silicon steel blanking production line developed and manufactured by Jinan No. 2 Machine Tool Group passed the user pre-acceptance, and another first domestic first set of equipment was born in Jinan Second Machine Tool Group. The news released by the Shandong Provincial State-owned Assets Supervision and Administration Commission (SASAC) has undoubtedly inspired the company.
Our stamping process equipment does not need to be imported, and the technical level has been equal to that of industrial developed countries. Dai Rongju, chief engineer of the automatic company of Jinan Second Machine Tool Group, said.
Everything is not easy. At present, domestic high-end CNC machine tools basically need to be imported, but the machine tools that can be exported to foreign countries are basically not. Professor Yu Shengmei, a national-level CNC machine tool expert, said that the main technical gap between the two sides is large.
However, in the context of the country's accelerated development of high-end equipment manufacturing industry, China's machine tool manufacturing enterprises, headed by Jinan No. 2 Machine Tool Group, have seen the spring of industry development and began to work hard to produce more high-end machine tool products and change China's industry. Fall behind.
Jinan Second Machine Tool Group leads the breakout
Now China is already the world's largest consumer of machine tools, but domestic machine tool companies mainly produce low-end products, which may produce more than 100,000 units per year, and import 10,000 or 20,000 high-end machine tools every year. The foreign exchange on the market has been equivalent to the output value of domestic low-end machine tools. Professor Yu Shengmei said.
Obviously, after the country has listed high-end equipment manufacturing in the seven strategic emerging industries, participating in international competition and striving to win has become the goal of domestic enterprises, and Jinan No. 2 Machine Tool Group is trying to do so.
Zhang Zhigang, chairman of Jinan No. 2 Machine Tool Group, went to Beijing for a report before mentioning the company's high-speed press line project. The project is organized by the National Development and Reform Commission, the Ministry of Science and Technology, and the Ministry of Industry and Information Technology. It is organized by the National High-end CNC Machine Tool and Basic Manufacturing Equipment Science and Technology Major Management Office. It reports to the State Council and relevant ministries and commissions on the implementation of major science and technology projects. A total of 4 companies participated. . In the report, Zhang Zhigang was the only timeout of the four reporting units, and the reporting time was extended from the original 8 minutes to 15 minutes. The reason was that during the reporting process, Jinan No. 2 Machine Tool Group became the only company to accept the leadership interrogation. Minister Wan Gang said at the time that the company's press line was quite simple and not easy. From 12 beats per minute to 16 beats per minute, the efficiency has increased by a quarter, and the quality has also driven the company.
Among the 6 types of machine tools provided for automobile companies, Jinan No. 2 Machine Tool Group's stamping process equipment is also the only type of equipment that does not need to be imported. The current market share is about 80%. The large-scale rapid press line mentioned in the above report. The installation and commissioning work was also completed in Shanghai GM Dongyue Automobile Co., Ltd. and Chery Automobile. There are basically no machine tool products exported to foreign countries, and the reason is that the technical level is not reassuring. Yu Shengmei said.
However, Dai Rongju said: When some international auto companies' joint ventures in China are doing related bidding, we are the only ones in China that are eligible to participate in the bidding. In the competition with foreign companies, they often succeed in winning the bid. The level of technology has been equal to that of industrialized countries.
Dai Rongju refers to the machine tool products built for automobile manufacturers. Our products are mainly supplied to automobile companies, but they also cover the needs of different levels. Dai Rongju said.
Lu Jiansheng, executive deputy general manager of Jinan No. 2 Machine Tool Group, said in an interview with People's Daily Online that about 7 or 8 of the 10 cars in the market are produced by our equipment. The Jinan Science and Technology Bureau said that Jinan No.2 Machine Tool Group is currently the largest and most comprehensive in the country, with the strongest comprehensive manufacturing strength and large heavy metal cutting machine tool manufacturing enterprises, and almost all of its own brand automobile production. Large-scale stamping equipment comes from Jinan No. 2 machine tools, and joint venture brands including GM, Honda and Volkswagen also use Jinan II Machine Tool Group. And exported to more than 50 countries and regions such as the United States, Canada, Germany, and become one of the "world's three major stamping equipment manufacturers." Jinan Science and Technology Bureau said.
At present, domestic high-end machine tool products are indeed far from the advanced level of foreign countries, and this requires further improvement of our technical level. Dai Rongju said.
However, Dai Rongju also pointed out that after the country released relevant plans for the high-end equipment manufacturing industry, the company must also hope to seize market opportunities.
In the news released by the Shandong Provincial State-owned Assets Supervision and Administration Commission, the 4000 kN automatic high-speed precision silicon steel sheet production line developed by Jinan Second Machine Tool Group has successfully passed the pre-acceptance of Dongfang Group Dongfang Motor Co., Ltd. Originally, this kind of product market has been monopolized by foreign companies. The orders obtained by Jinan No. 2 Machine Tool Group came from the competition in the same stage with German and Japanese companies in 2009. This product has reached a high level in terms of machine structure, accessory selection, machine vibration and noise, and stamping efficiency. Jinan Science and Technology Bureau said.
In addition, the company also said that the production of high-torque mechanical double-angle milling heads has also broken the long-term technological monopoly of developed countries in China, and has been well applied and verified in the blade processing of the Three Gorges Hydropower Station.
The company also announced that since August this year, it has won a series of high-end product orders in international bidding. For example, it has signed one-arm and two-arm feeding fast stamping with users such as FAW-Volkswagen, Shanghai GM and Jiangling Motors. Supply contracts for lines, large robot press lines, and large multi-station presses show the company's strong international competitiveness.
Furthermore, a standard lap joint flange will typically have a longer hub length in comparison to a slip on flange, but this is often considered unnecessary for many applications.
The lap joint flange is practically identical to a slip-on flange except it has a radius at the intersection of the bore and flange face.
According to statistics, since 2010, the growth rate of production and sales of the machine tool industry has been above 40%. Galaxy Securities expects that the compound growth rate of the machine tool industry will be 25% to 30% in the next five years, and the medium and high-end CNC machine tools will become the main growth force. Galaxy Securities explained that the growth momentum comes from the continuous upgrading of existing products and the gain of international market share. On the other hand, it comes from technological R&D and product innovation, and enters the product areas supported by the state to form new growth points.