1. Technical characteristics of high-speed precision stamping parts
High-speed precision stamping parts have a wide range of types, large production volumes, high precision, complex shapes, thin plate materials and diverse materials. The main types of high-speed precision stamping parts have the following technical characteristics.
The stator and rotor core are important parts of the motor, and its quality directly affects the technical performance of the motor. The traditional motor stator and rotor core manufacturing process is to stamp out stator and rotor punching pieces (scattered pieces) with a general punching die, and then use rivets, clasps, argon welding and other methods to make the core. For the AC motor rotor core, the chute needs to be twisted manually. Stepping motors require uniform magnetic properties and thickness directions of the stator and rotor cores. The stator core and rotor core punching pieces are required to rotate at a certain angle. For example, they are made by traditional methods, and the efficiency is low, and the accuracy is difficult to meet the technical requirements. With the continuous development of industrial production technology, in the technical fields of motors and electrical appliances, high-speed stamping multi-station progressive dies have been widely used to manufacture automatic laminated structure cores, such as stator and rotor cores of various micro motors, and chevrons. , U-shaped, small transformer core, etc. Among them, the stator and rotor cores can also be equipped with torsion stacking chute, and a large-angle rotating stacking riveting structure between the punching pieces. Compared with ordinary punching dies, multi-station progressive die has the advantages of high stamping accuracy, high production efficiency, long service life, good consistency in the dimensional accuracy of the stamped iron core, easy automation, and suitable for mass production. It is the precision of the micro-motor industry. The direction of mold development.
There are the most types of electronic stamping parts and the most complex structure. The general precision requirements of electronic stamping parts are relatively high. At the same time, the thickness of the stamping material is required to be accurate and uniform, with a smooth surface, no spots, no scars, no scratches, no surface cracks, etc., and the yield strength of the material is uniform, without obvious directionality, High uniform elongation and low work hardening.
The heat exchanger fin refers to the metal sheet for heat transfer in the heat exchange device, which increases the heat exchange surface area of the heat exchange device and improves the heat exchange efficiency. The annual output of heat exchanger fins reaches hundreds of millions of pieces, and the material is usually 0.08~0.20mm thick aluminum foil, so it must be produced by high-speed progressive die.
The semiconductor lead frame is the carrier of the semiconductor chip and plays the role of the interface between the semiconductor device and the printed circuit board (PCB). Its notable features are: surface quality, shape accuracy, shape and position accuracy, accumulated error, appearance characteristics and other requirements, which are the highest among all stamping parts. In particular, the shape of the inner lead is basically like a slender and long cantilever like a crab foot, which is different from the conventional stamping process.
There are many types of electrical connectors and a wide range of applications. The stamping parts contained in them are of various forms, and generally have the following characteristics.
(1) High reliability. Because it is an electrical signal connection between subsystems, it is required to maintain reliability under harsh conditions such as shock, vibration, stress relaxation, and environmental corrosion. Generally, electroplating treatment is performed to ensure corrosion resistance.
(2) High-precision, conventional civil product connector stamping parts, the general blanking accuracy is within ±0.03mm, the bending accuracy is within ±0.05mm, and the high-level blanking accuracy requires ±0.01mm, and the bending accuracy is within ±0.02 Within mm.
Micro-forming stamping parts mainly include micro-drawing, incremental forming, micro-punching and micro-bending of thin plates. Compared with the traditional stamping process, although the process is the same, the micro stamping is not a simple reduction of the traditional stamping shape.
As the size of formed parts shrinks, micro-stamping has the following characteristics.
1) The ratio of surface area to volume increases, which affects temperature conditions.
2) The smaller the part size, the greater the influence of the adhesion force and surface tension between the tool and die.
3) The influence of the grain size is very significant, and it is no longer regarded as a uniform continuum of the same sex like the traditional forming.
4) When the width of the product is equivalent to the thickness of the plate, the high strain rate will affect the plasticity and microstructure of the material, especially the grain size and typical workpiece size.
5) The smaller the size of the part, the smaller the ratio of the closed lubrication pit area to the total lubrication area, and the more difficult it is to store lubricant on the surface of the workpiece.
Metal stamping parts are widely used in various fields that we are familiar with, including some electronic devices, auto parts, decorative materials, instruments and meters, etc. Metal stamping parts are thin, uniform, light, small and strong.
2. Production mode of high-speed precision stamping parts
High-speed precision stamping parts are mass-produced with high-speed precision press production line and multi-station cemented carbide progressive die as the main process means, which also include the composite progressive process of punching, drawing, bending, flanging, riveting, etc. Mold. The materials are mostly coiled strips, which are automatically unloaded by an automatic unloading rack, and generally need to be leveled by a leveling machine. The leveled material is automatically fed by the feeder attached to the high-speed press. In order to improve the stamping performance, the surface of the material needs to be immersed or sprayed with stamping oil. The selection of stamping oil also needs to evaluate the needs of the subsequent process. The parts are usually automatically packaged by the reel of the rewinding machine, and the parts are added with interlayer paper or plastic film, or sent directly to the collector by the conveyor belt. Some stamping parts need post-processing, such as cleaning, electroplating, etc. Most high-speed precision stamping parts are produced by a single machine automatically, and some complex parts are produced by a multi-machine automatic production line.
