Punch and die for stamping overview by applying external forces such as sheet, strip, pipe and profile, and make it produce plastic deformation or separation, to obtain the required shape and size of the workpiece forming method, the workpiece is stamping parts.
Stamping is to rely on press and die for sheet, strip, pipe and profiles, such as external force, make its produce plastic deformation or separation, thus to obtain the required shape and size of the workpiece,
The forming method.
Stamping and forging belong to plastic processing (
Or pressure processing)
, called the forging press.
Stamping of billet is mainly hot rolling and cold rolling steel plate and steel belt.
Steel all over the world, there are 60 ~ 70% is plank, most of which is made by stamping products.
Car body, chassis, fuel tank, radiator fin, the boiler steam drum, container shell, motor, electric iron core silicon steel sheet stamping processing.
Instruments and meters, household appliances, bicycles, office machinery, household utensils, and other products, also have a large number of stamping parts.
Compared with the castings, forgings, pressing with a thin, uniform, the characteristics of light and strong.
Stamping can make other methods are difficult to manufacture with rib stiffener, flanging, ups and downs, or artifacts, in order to improve its stiffness.
Because use precision mould, workpiece precision can reach micron grade, and repeat precision is high, the specification is consistent, can punch a hole nest, convex sets, etc.
Cold stamping generally no longer by machining, or only need a small amount of machining.
Hot stamping precision and surface state is lower than the cold stamping parts, but it's still better than the castings, forgings, cutting processing capacity.
Stamping is efficient production methods, the use of compound die, especially the multi-station progressive die, it can be finished in a pressure on multichannel stamping process, realize the pick-up uncoiling, leveling, cutting to the forming and finishing of automatic production.
High production efficiency, good working conditions, low production cost, general can produce hundreds of pieces per minute.
Stamping process for mainly according to classification, can be divided into separation process and forming process two kinds big.
Separation process is also called the blanking, and its purpose is to make from the sheet metal stamping parts along the contour line must be separated, and at the same time guarantee the quality requirements of the separation section.
Forming process is designed to make sheet metal under the condition of not to break the billet occurred plastic deformation, made into the required shape and size of the workpiece.
In the actual production, is often a variety of process integrated applied to an artifact.
Cutting, bending, shear, deep drawing, bulging, spinning, correction is several main stamping process.
Metal stamping parts stamping sheet surface and internal performance of stamping has great influence on the quality of the finished product, request stamping material thickness precision, uniform;
Smooth surface, no spots, no scar, no scratch, no surface crack, etc. ;
Yield strength evenly, no obvious directivity;
High uniform elongation;
Low strain hardening.
In the actual production, commonly used to approximate the manufacturability of stamping process test, such as deep drawing performance test, bulging performance test and other test materials stamping performance, to ensure the quality of the finished product and high qualified rate.
The precision of the mould and structure directly affect the forming of stamping parts and precision.
Mould manufacturing cost and quality of life is to affect the cost of stamping parts and an important factor.
Mold design and manufacturing needs more time, it extended the new stamping production preparation time.
Mold base, frame, guide the standardization and development of simple dies (
For small batch production)
Progressive die, compound die, transfer (
For mass production)
, as well as the development of quick die change equipment, can reduce stamping production preparation work and shorten the preparation time, can reduce suitable for stamping production preparation work and shorten the preparation time, can make the suitable for mass production of advanced punching technology reasonably applied to small batch more varieties of production.
Stamping equipment in addition to the thick plate with hydraulic press forming, generally adopts the mechanical press.
In modern high-speed transfer mechanical press as the center, the configuration open book, flattening, collection, transmission machinery and tooling libraries and quick die change equipment, and use the computer program control, automatic stamping production line can be of high productivity.
In production dozens, hundreds of stampings per minute, in a short time to finish feeding, punching, the pieces, discharge waste process, such as personal, equipment and quality accidents occurred frequently.
Therefore, safety in production of stamping is a very important problem.
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