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Technical characteristics and production mode of high speed precision stamping parts

2018/5/24 19:39:59 Viewers:
Technical features of 1. high speed precision stamping parts

High speed precision stamping parts have many kinds, large production volume, high precision and complex shape. The main types of high-speed precision stamping parts have the following technical characteristics.

Stator and rotor core is an important part of the motor. Its quality directly affects the technical performance of the motor. The traditional manufacturing process of stator and rotor core is to make the core by stamping the fixed and rotor flakes (scattered pieces) by the general punch die, through the flush, rivet riveting, buckle and argon soldering. For the rotor of AC motor, the chute should be twisted manually. The step motor requires that the magnetic and thickness direction of the stator and rotor is uniform, and the stator core and the rotor of the rotor are required to rotate a certain angle respectively, such as the efficiency is low, and the precision is difficult to meet the technical requirements. With the continuous development of industrial production technology, high speed stamping multi position progressive die has been widely used in the fields of motor and electrical technology, such as the fixed and rotor core of various micro motors, and the shape of mountain, U and small transformer core. Among them, the stator and rotor core can also be provided with a torsion stacking groove, and a large angle rotary stacking rivet structure between the punching pieces.  Compared with the ordinary die, the multi position progressive die has the advantages of high stamping precision, high production efficiency, long service life, good consistency of dimension precision of stamping iron core, easy to realize automation, suitable for mass production and so on. It is the direction of precision die development in micromotor industry.

Electronic stamping parts have the largest variety and the most complex structure. The general precision requirements of the electronic stamping parts are high. At the same time, the precision and uniformity of the stamping material, smooth surface, no spots, no scars, no abrasions, no surface cracks are required. The yield strength of the material is uniform, no obvious direction, high uniform elongation, and low working hardening.

The fin of heat exchanger refers to the heat transfer metal sheet in the heat exchange device, which increases the heat exchanger surface area of the heat exchanger and improves the heat transfer efficiency.  The heat exchanger fin has an annual output of hundreds of millions, and its material is usually 0.08~0.20mm thick aluminum foil. Therefore, high speed progressive die must be used.

Semiconductor lead frame is the carrier of semiconductor chip, playing the interface role between semiconductor device and printed circuit board (PCB). Its outstanding characteristics are: surface quality, shape accuracy, shape and position accuracy, accumulation error, appearance characteristics and so on. It is the highest among all stamping parts. In particular, the shape of its lead is basically like a crab's long and thin cantilever, which is different from the conventional stamping process.

There are a wide variety of electrical connectors and widely applied fields. The stamping parts included are various in form and generally have the following characteristics.

(1) high reliability, due to the electrical signal connection between subsystems, it is required to maintain reliability under harsh conditions, such as impact, vibration, stress relaxation, environmental corrosion and so on. Electroplating is usually used to ensure corrosion resistance.
(2) high precision, conventional civil product connector stamping parts, general blanking precision within + 0.03mm, bending precision within + 0.05mm, and high grade blanking precision required + 0.01mm, bending within + 0.02mm.

The micro stamping parts include micro drawing, incremental forming, micro punching and micro bending. 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.

With the size reduction of forming parts, micro stamping has the following characteristics.

1) its surface area and volume ratio increase, thus affecting the temperature condition.
2) the smaller the part size, the greater the adhesive force and the surface tension between the die and mold.
3) the effect of grain size is very significant, and is no longer regarded as homogenous homogeneous continuum, just like traditional forming.
4) when the width of the product is equal to the thickness of the plate, the high strain rate will affect the plastic and microstructure of the material, especially the size of grain and the size of the typical workpiece.
5) the smaller the size of the parts, the smaller the proportion of the closed lubrication area to the total lubrication area, and the harder the lubricant stored on the workpiece surface.

Metal stamping parts are widely used in many areas we know well, including some electronic devices, auto parts, decorative materials, instruments and meters. The hardware stamping parts have the characteristics of thin, uniform, light, small and strong.

2. production mode of high speed precision stamping parts

High speed precision stamping parts use high speed precision press production line and multi position cemented carbide progressive die as the main technological means to implement mass production, including blanking, drawing, bending, flanging and riveting. The material is mostly coil material, which is automatically discharged by the automatic discharge rack, which is usually leveled by leveling machine. The leveling material is automatically fed by a high-speed press auxiliary feeder. In order to improve stamping performance, the surface of the material needs to be dipped or pressed. The selection of stamping oil requires the assessment of the needs of the subsequent process. The parts are usually automatically wrapped by the reel reel, and the paper or plastic film is added to the parts, or conveyed directly to the collector by the conveyor belt. Some stamping parts need post-processing, such as cleaning, electroplating and so on. The vast majority of high-speed precision stamping parts are produced by single machine automation, and individual complex parts adopt multi machine automatic production line.