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Production material and technology of stamping elbow

2021-04-24 13:23:18
The process and technical parameters of stamping elbow need to be used in a certain way and method, so as to ensure that the produced and processed stamping elbow has good use characteristics and advantages, and plays an important role and value in use. In the production of stamping elbow, there are many different factors that affect the performance and technology of stamping elbow. The process parameters that affect the shape of stamping elbow are: the material, wall thickness and outer diameter of the blank used for pushing, the material and shape of the core rod head, the heating temperature and its distribution and the propulsion speed. Different factors have different influence on stamping elbow. In use, it is necessary to use it according to the corresponding methods and methods to ensure the specific use value and function of stamping elbow in use.
 
Stamping elbow is made of malleable iron, which is used for the connection of water supply pipe, water vapor pipeline, gas pipeline and oil pipeline. The stamping elbow is black in color, forming right angle bending, excellent quality, wear-resistant and not easy to damage. The specification of stamping elbow is 1 / 2-10 inch, and the products are widely used in pipeline installation, installation and supporting services in petroleum, chemical, metallurgy, power and other industries.
 
The stamping elbow is mainly connected with pipe fittings, which can take on a heavy task in the development of this product, and has the first-class international technology level and sails. The processing technology of stamping elbow pipe fittings has certain technology, and it is produced according to certain technology in production:
 
1. The double clamp pressure is 1.8 times higher than that of single clamp pressure, which is more suitable for high-rise and high water pressure buildings.
 
2. Double clamp fittings will not cut rubber rings when inserting into the pipe.
 
3. The double clamp type pipe fittings are used in stainless steel pipe system, which can increase the size accuracy, allow the error of the pipe to increase and the adaptability is stronger.
 
4. The double clamp type rubber ring seal is made up of stainless steel material, and the durability of the rubber ring is obviously improved, and the double clamp seal ring is squeezed evenly on the left and right, and the sealing ring will not be extruded from the side by water pressure, which makes up for the shortage in the application of single clamp pressure.
 
5. At the double clamp joint, the pipe will not affect the sealing ring when the pipe is bent by external force. The upgraded products of the technical performance, technical index and technical level of the stamping elbow pipe type clamp connection are not affected.
 
The material of stamping elbow needs some special raw materials to be produced. These materials should be strictly selected and controlled. The raw materials should be selected appropriately, otherwise, the quality assurance will not be provided for the stamping elbow
 
The stamping materials of stamping elbow are various and widely used. It is forming a large-scale high-tech industry group, which has a very broad market prospect and very important strategic significance. Stamping materials can be classified according to different classification standards. According to the performance of stamping, they can be divided into microelectronic materials, optoelectronic materials, sensor materials, information materials, biomedical materials, ecological environment materials, energy materials and smart (intelligent) materials. These stamping materials have different performance, Show good use value in different fields and industries.
 
Manufacturing process of elbow:
 
a. Hot push forming
 
The forming process of hot push elbow is a process in which special elbow pusher, core die and heating device are used to make the blank set on the die move forward under the push of the pusher, and is heated, expanded and bent during the movement. The deformation characteristics of hot push elbow are to determine the pipe blank diameter according to the rule that the volume is constant before and after plastic deformation of metal materials. The pipe blank diameter adopted is smaller than the elbow diameter. The deformation process of the blank is controlled by the core die, so that the metal flow compressed at the inner arc can be compensated to other parts which are thinned due to the expansion, so as to obtain the elbow with uniform wall thickness. Hot push elbow forming technology has the characteristics of beautiful appearance, uniform wall thickness and continuous operation, which is suitable for mass production. Therefore, it has become the main forming method of carbon steel and alloy steel elbow, and also applied to the forming of some stainless steel elbows. The heating methods of forming process include medium frequency or high frequency induction heating (heating ring can be multi circle or single circle), flame heating and reflection furnace heating. The heating method adopted depends on the requirements of forming products and energy conditions.
 
b. Stamping
 
Stamping elbow is the first process used in batch production of seamless elbow. At present, it has been replaced by hot push or other forming processes in the production of elbow of common specifications. However, in some elbow, it has been produced in small quantity, too thick or too thin. The product is still in use when it has special requirements. The elbow is formed by pressing the tube blank equal to the outer diameter of the elbow, and the press is used to press directly in the die. Before stamping, the tube blank is placed on the lower die, and the inner core and end die are installed into the tube blank. The upper die moves downward to press, and the elbow is formed by the constraint of the external mold and the support of the inner mold.
 
Compared with the hot push process, the appearance quality of stamping is not as good as that of the former; When forming, the outer arc of the stamping elbow is in the tensile state, and no other parts of the excess metal is compensated, so the wall thickness of the outer arc is about 10% thinner. But because of the characteristics of single piece production and low cost, stamping elbow technology is mostly used in the manufacture of small batch and thick wall elbows. The elbow is divided into two types: cold stamping and hot stamping, which usually choose cold stamping or hot stamping according to the material properties and equipment capability. The forming process of cold extrusion elbow is to use special elbow forming machine, put the tube blank into the outer mold, after the upper and lower die is closed, and under the push rod, the tube blank moves along the gap reserved by the inner and outer die to complete the forming process.
 
The elbow made by cold extrusion process of internal and external mould is beautiful in appearance, uniform in wall thickness and small in size deviation. Therefore, this process is used for forming stainless steel elbow, especially thin-walled stainless steel elbow. The precision of internal and external models used in this process is high; The deviation of the wall thickness of the tube blank is also very strict.
 
c. Other forming methods
 
In addition to the three common forming processes, seamless elbow forming also adopts the forming process of extruding the tube blank into the outer die and then through the ball shaping in the tube blank. However, this process is relatively complex, operation is difficult, and the forming quality is not as good as the above process, so it is less used.

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