Metal stampings are the forming and processing methods of workpieces (metal stampings) with required shape and size by applying external forces on plates, strips, pipes and profiles by presses and dies to cause plastic deformation or separation. There are many application fields of metal stampings at present, and the specific advantages can be learned from this guide.
Application and Characteristics of Metal Stamping Parts
Metal stamping parts are the production technology of product parts with certain shape, size and performance by means of the power of conventional or special stamping equipment to make the sheet directly subject to deformation force in the mold and deform. Sheet metal, die and equipment are the three elements of stamping processing. Stamping is a metal cold deformation processing method. Therefore, it is called cold stamping or sheet metal stamping. It is one of the main methods of metal plastic processing (or pressure processing), and also belongs to material forming engineering technology. There are thin, uniform, light and strong characteristics of metal stamping parts, castings and forgings. Stamping can produce workpieces with reinforcing ribs, ribs, curling or flanging that are difficult to manufacture with this skilled hand diameter, so as to improve their rigidity. As the rough die is rejected, the precision of the workpiece can reach the micron level, and the precision is high, the specification is consistent, and the holes and sockets, bosses, etc. can be punched. In actual production, process tests similar to the stamping process, such as deep drawing performance test and bulging performance test, are often used to inspect the stamping performance of materials to ensure the quality of finished products and high qualification rate.
Common Forming Types of Metal Stamping Parts in Drawing Process
Metal stamping parts use stamping equipment to stretch and shape products, including: stretching, re stretching, reverse stretching and thinning stretching. For stretching processing, the pressing plate device is used to pull part or all of the flat plates into the cavity of the concave mold by using the punch pressure, so as to form a container with a bottom. The processing of the side wall of the container parallel to the stretching direction is a simple stretching processing, while the stretching processing of cone (or pyramid) descriptors, hemispherical descriptors and parabolic surface containers also includes expanding processing. Re drawing processing, that is, for deep drawing products that cannot be completed by one drawing process, it is necessary to re stretch the formed products of the drawing process to increase the depth of the formed container. Reverse stretching refers to the process of reverse stretching the stretching workpiece of the previous process, turning the inner side of the workpiece into the outer side, and reducing its outer diameter. Thinning and stretching processing: extrude the formed container into the concave cavity slightly smaller than the outer diameter of the container with a punch, so that the outer diameter of the container with a bottom becomes smaller and the wall thickness becomes thinner, which not only eliminates the wall thickness deviation, but also makes the surface of the container smooth.
Stability of metal stamping production and its influencing factors
The main factors that affect the stability of metal stamping parts are: the use method of die materials, the strength requirements of die structures, the stability of stamping material properties, the fluctuation characteristics of material thickness, the variation range of materials, the resistance of tensile ribs, the variation range of blank holder force, and the selection of lubricants. What is stability? Stability is divided into process stability and production stability. Process stability refers to the process scheme that meets the requirements of stable production of qualified products; Production stability refers to the stable production capacity in the production process. Most of the mould manufacturing enterprises are small and medium-sized enterprises, and quite a few of these enterprises are still in the traditional workshop production management stage, often ignoring the stability of the mould, resulting in long mould development cycle, high manufacturing costs, and seriously restricting the pace of enterprise development.
Unique advantages of stamping process for metal products
Metal stamping is an efficient production method. Using compound die, especially multi station progressive die, multiple stamping processes can be completed on one press (single station or multi station) to realize fully automatic production from strip uncoiling, leveling, blanking to forming and finishing. High production efficiency, good working conditions, low production cost, generally hundreds of pieces can be produced per minute.
At present, metal stamping parts have covered aerospace, aviation, military, machinery, agricultural machinery, electronics, information, railway, post and telecommunications, transportation, chemical industry, medical appliances, household appliances, light industry and other fields. Not only is it used by the entire industry, but everyone has direct contact with stamping products. There are many large, medium and small stamping parts on airplanes, trains, cars and tractors. The car body, frame, rim and other parts are all stamped. According to relevant statistics, 80% of bicycles, sewing machines and watches are stamped parts; 90% of TV sets, radio recorders and video cameras are stamping parts; There are also metal cans and shells for food, refined steel boilers, enamel basins and bowls, and stainless steel tableware, all of which are stamping products using molds; Even the metal of the computer is not lack of stamping parts.