What should be paid attention to in stamping process of 3C electronic parts?

3C electronic parts are characterized by miniaturization, high precision and thinning, and most of them are made of deformable materials such as stainless steel, copper alloy and aluminum alloy. The stamping process needs to focus on four core points: precision control, material protection, mold maintenance and automatic adaptation. The specific precautions are as follows:

Raw material pretreatment and quality control

The thickness tolerance (usually within ±0.005mm) and surface flatness of raw materials (such as ultra-thin copper strip and stainless steel foil) for 3C parts should be strictly checked. It is forbidden to use base materials with scratches, oxidation and impurities on the surface to avoid burrs or cracks after stamping.

For soft materials such as copper and aluminum, the surface should be cleaned and degreased before stamping, and special stamping lubricating oil should be sprayed when necessary to prevent the materials from sticking to the die and reduce surface scratches during stamping.

The coil should be equipped with tension control system to avoid stretching and twisting in the feeding process and ensure the feeding accuracy.

Key requirements of mold design and debugging

The die should be made of high wear-resistant materials such as cemented carbide or high-speed steel, the cavity and cutting edge should be precisely ground and polished, and the gap between the cutting edges should be accurately calculated according to the thickness of the material (for example, the gap is usually 8%~10% of the thickness of the material) to prevent the parts from wrinkling, deformation or burr exceeding the standard.

For 3C parts with micro-holes and special-shaped structures, guide and positioning devices (such as guide posts, guide sleeves and positioning pins) should be added to the die to ensure accurate alignment of the upper and lower dies during stamping and avoid dimensional deviation.

In the trial punching stage, the size (such as aperture, shape tolerance) and surface quality of the parts should be tested one by one. When burrs are found to be out of tolerance or deformed, the cutting edge gap or stamping pressure should be adjusted in time, and mass production with mold defects is prohibited.

Precise control of stamping process parameters

Select servo precision punch to accurately adjust the punching speed, stroke and pressure: for thin-walled parts, it is necessary to reduce the punching speed and reduce the impact of punching force on materials; For special-shaped bent parts, it is necessary to use step-by-step stamping to avoid cracking caused by one-step molding.

During continuous die stamping, it is necessary to strictly control the accuracy of feeding step (error ≤±0.01mm) to prevent parts from shifting during multi-station stamping, and at the same time, set up a waste cutting device to avoid waste accumulation and die sticking.

Monitor the running status of the equipment in real time during the stamping process. If there is abnormal noise and vibration, stop the machine immediately for inspection to prevent the mold from being damaged or the parts from being scrapped in batches.

Surface protection and subsequent treatment of parts

3C electronic parts require extremely high surface smoothness. After stamping, it is necessary to use vacuum suction or anti-static fixture to take the parts. It is forbidden to touch the surface of the parts with bare hands to prevent fingerprints and sweat stains.

After stamping, the parts should be deburred in time (such as ultrasonic cleaning, grinding and polishing), especially the connector and terminal parts, and the burr height should be controlled below 0.003mm to avoid affecting the subsequent assembly and electrical performance.

Parts with rust-proof requirements (such as stainless steel shrapnel) should be passivated after stamping and packed in antistatic vacuum to prevent oxidation and scratches during transportation.

Supporting management of automation and detection links

Automatic roll-to-roll production lines are mostly used for stamping 3C parts, and online vision inspection system is needed to detect defects such as size, burr and deformation of parts in real time, and unqualified products are automatically eliminated to ensure the consistency of batch production.

The production line needs to be equipped with anti-static devices to avoid electrostatic adsorption of dust or damage to the conductivity of electronic parts.

Key points of safety and environmental control

High-speed precision punch should be equipped with safety grating, two-hand start button and other protective devices to prevent operators from touching the mold by mistake; Cut off the power supply when disassembling and assembling the mold, and use a special spreader to avoid the mold from falling and hurting people.

Environmental protection products should be selected for stamping lubricating oil, and oil-water separation and recovery devices should be provided to avoid oil pollution to the environment; Metal waste should be classified and recycled to prevent material pollution caused by mixing.