In 1986, Beijing Stone Group Co., Ltd. was established with a registered capital of 100 million yuan, which has been maintained up to now. In its first year of establishment, Stone achieved a sales revenue of 9 million yuan, exceeding 100 million yuan in 1986, 1 billion yuan in 1988, 1.3 billion yuan in 1990, and nearly 6.6 billion yuan in 1997. By the end of 1999, the accumulated sales revenue of 15 years was nearly 40.9 billion yuan, and the profits and taxes were 1.58 billion yuan. In 1986, the net assets of the enterprise reached 10 million yuan, more than 90 million yuan in 1989, 600 million yuan in 1994, and 1.8 billion yuan in 1997. Since the 1980s, in the endless stream of Chinese enterprises, we have developed high-tech in the mode of private ownership, from small to large, and worked tirelessly. Stone has been considered one of the most outstanding representatives. However, on January 19, 2005, the trademark of Stone was almost auctioned to offset the loan and interest owed by Stone Group to Everbright Bank for four years. Fortunately, Stone Group reached a settlement with Everbright Bank, temporarily out of the dilemma of immediate bankruptcy. Stone is a springboard for Japanese investment to enter China. When it is used up, it will be thrown away, providing a negative warning to Chinese enterprises; If you are still intoxicated with the dream of "market for technology" and "win-win", Chinese enterprises will never emerge. The cross is a pipe fitting and pipe connector. It is also called pipe fitting four-way or four-way pipe fitting, four-way joint, which is used at the branch pipe of main pipe. The cross has equal diameter and reducing diameter, and the nozzle ends of equal diameter cross are the same size; The size of the main pipe of the reducing cross is the same, but the size of the branch pipe is smaller than the size of the main pipe. A cross is a pipe fitting used at a branch of a pipe. Four way welded four way
The hydraulic bulging of cross is a forming process of expanding branch pipes by axial compensation of metal materials. The process is to use a special hydraulic press to inject liquid into the tube blank with the same diameter as the cross, and extrude the tube blank through the synchronous centering movement of the two horizontal side cylinders of the hydraulic press. The volume of the tube blank becomes smaller after extrusion, and the pressure of the liquid in the tube blank increases as the volume of the tube blank becomes smaller. When the pressure required for the expansion of the cross branch pipe is reached, The metal material flows along the inner cavity of the die and bulges out the branch pipe under the double action of the side cylinder and the liquid pressure in the tube blank. The hydraulic bulging process of the cross can be formed in one time with high production efficiency; The wall thickness of the main pipe and shoulder of the cross has increased. Due to the large tonnage of equipment required for the hydraulic bulging process of seamless cross, it is currently mainly used for the manufacture of standard wall thickness cross smaller than DN400 in China. The applicable forming materials are low-carbon steel, low-alloy steel and stainless steel with relatively low cold hardening tendency, including some non-ferrous materials, such as copper, aluminum, titanium, etc.