Precision Stamping Parts

Precision stamping is a forming method that uses presses and dies to apply external force to plates, strips, pipes, and profiles to make them plastically deform or separate to obtain workpieces of the desired shape and size. The precision stamping parts process can be roughly divided into two categories: separation process and forming process (also divided into bending, deep drawing and forming) according to the finished product of the workpiece.
(1) The separation process is to separate the stamping part and the blank from each other along a certain contour line during the stamping process, and the quality of the separation section of the stamping part must also meet certain requirements;
(2) The forming process is to make the stamping blank plastically deform under the condition of no damage, and convert it into the required shape of the finished product, and also meet the requirements of dimensional tolerances. Precision stamping parts are divided into cold stamping and hot stamping according to the temperature during stamping. This depends on the strength, plasticity, thickness, degree of deformation, and equipment capabilities of the material. At the same time, the original heat treatment state and end-use conditions of the material should be considered.


(1) Processing of cold stamped metal at room temperature.

After the meltblown technology was commercialized, the meltblown spinning technology has developed rapidly. Meltblown nonwoven fabrics can be designed to achieve the required filtration function. Therefore, meltblown filter products can systematically replace traditional materials in different fields. The ultrafine fibers (0.015den) of the melt-blown non-woven fabric and the three-dimensional tortuous structure formed by the fibers bonding and entangled in the space are completely different from the fiber distribution in traditional fabrics and carded non-woven fabrics. The sprayed nonwoven fabric has the characteristics of larger specific surface area, higher porosity (≥80%), finer voids (pore size ≤1μm), and excellent filtering performance is much higher than other common filtering materials. The resin chips are fed into the screw extruder, heated and melted, and then extruded from the nozzle. The polymer melted at the outlet of the die is stretched by high-speed hot air flow, and cold air is supplemented from both sides of the die to cool and solidify the fiber to form a Fine and short fibers, under the action of airflow, these short fibers condense to the fiber collection device to form a fiber web or core tube.

The non-woven melt-blown process is one of the polymer extrusion non-woven processes and originated in the early 1950s. Started to develop filter material with ultra-fine filtration effect, and published research results in 1954. In China, the research on melt-blown non-woven fabrics is about the end of the 1950s and the beginning of the 1960s, and the equipment studied is intermittent. By the end of the 1960s and the beginning of the 1970s, the number of intermittent meltblown equipment in China had reached more than 200. About 92-94 years from the United States, Germany introduced continuous production lines. So far, it is estimated that there are still more than 300 intermittent meltblowing equipment in operation throughout the country. In 2006, the output of national melt-blown non-woven fabrics exceeded 20,000 tons, of which about 70% was produced by continuous melt-blown equipment. Due to the high single-line output of continuous melt-blown equipment, the use of fewer people, and easy management, the future development of melt-blown nonwoven fabric production mainly refers to the development of continuous melt-blown equipment. Since the 1980s, melt-blown non-woven fabrics have grown rapidly. Maintained an annual growth rate of 10% -12%.

The concentricity of spinneret microholes and guide holes is generally processed from one side, from large holes to microholes. Due to the large overhang, the difficulty factor is extremely high. Due to the urgent need for rapid production, most of the processes have now been changed to process micro holes from the back, but this will cause problems such as concentricity and burrs.