Introduction
Extrusion of brass pipes is the process of forcing metal through a hole or opening in a die of the required shape and size. This process is the most widely used and economical method for producing brass pipes, which have a wide range of uses ranging from ornamental fittings for household goods to industrial use for ducting and plumbing systems. The GB 1530-87 standard outlines the properties, tolerances and methods of manufacture for extruded brass pipes, and provides detailed guidance to ensure safety, reliability and efficiency of the production process.
Material Properties
Brass pipes are alloyed metals produced mainly from copper and zinc. According to the GB 1530-87 standard, metal alloys used in the production of extruded brass pipes shall contain not less than 58.5% copper, not more than 39.5% zinc and no more than 2% lead. Other alloying elements, such as aluminium, tin, manganese and nickel, are also permitted in specified proportions.
Tolerances
The most important criteria for brass pipes used for industrial and home use is that extremities of the pipes must fit into one another without leaving a gap or being too tight. The permissible tolerances of brass pipes can vary depending on the size, wall thickness and end use of the product. According to the GB 1530-87 standard, the wall thickness for extruded brass pipes should be measured a distance of 5-10 mm from the end of the pipe. The permissible tolerance is 0.3 mm for pipes with a wall thickness of 1.5 mm or less, and 0.5 mm for pipes with a wall thickness of more than 1.5 mm.
Methods of Production
Extruded brass pipes are manufactured by very different methods and materials. Traditional production methods involve pushing the molten brass through an opening with a punch and die. This process can be used to produce pipes of any form and size, but it is more time-consuming and costly than other methods. More modern methods of production such as cold-drawing and roll-forming are faster and more cost-effective alternatives. The quality of the finished product is dependent on the expertise of the operator, the selected starting material and the accuracy of the hole or opening being used to form the pipe.
Conclusion
Brass pipes are used in a range of industries from plumbing to engineering, from ornamental applications to industrial ducting, and have been manufactured using the extrusion process for many years. The GB 1530-87 standard provides a comprehensive set of guidelines for ensuring quality and safety in the production process of extruded brass pipes, covering material properties, tolerances and methods of production. All these guidelines help to ensure product reliability and efficiency and provide detailed instruction to hasten the production process while ensuring quality of the finished product.
