What matters should be paid attention to in the processing of stamping parts of electronic products?

Stamping parts of electronic products require high precision, are mostly made of thin materials (such as copper, aluminum and stainless steel sheets), and often need to meet special properties such as conductivity and assembly. During the processing, the following items should be controlled emphatically to ensure product quality and production efficiency:

First, raw materials and mold preparation stage

Quality control of raw materials

The common materials for stamping parts of electronic products are copper strip, aluminum strip, cold-rolled steel strip, stainless steel strip, etc. It is necessary to confirm whether the thickness tolerance, hardness and surface smoothness of the materials meet the requirements of the drawings, so as to avoid the size deviation caused by the thickness deviation of the materials, or the surface scratches affect the conductivity and appearance.

For parts that need to be bent and stretched, the ductility of materials should be verified to prevent cracking and deformation during processing.

Materials should be moisture-proof and oxidation-proof, especially copper and aluminum materials, to avoid the impact of surface oxide layer on stamping and subsequent electroplating process.

Mould precision and maintenance

Stamping parts of electronic products are mostly tiny and precise structures (such as connector pins, shielding covers, terminals, etc.). The precision and clearance of the cutting edge of the die must be strictly matched with the thickness of the material. If the clearance is too large, it will easily produce burrs, while if it is too small, it will aggravate the wear of the die and cause the material to stick to the knife.

Before installing the mold, it is necessary to check whether the cutting edge is sharp and the guide parts are smooth, and the mold surface should be clean and free of impurities to prevent the product surface from being crushed.

Regularly lubricate and maintain the mold, and replace the worn parts in time to avoid mass defective products caused by mold failure.

Second, the stamping process control

Process parameter setting

Stamping speed: according to the thickness of materials and the complexity of parts, thin materials and precision parts need to be stamped at low speed to reduce the tensile deformation of materials; Batch of simple parts can be accelerated appropriately, but it is necessary to avoid excessive die impact.

Feeding accuracy: when using the automatic feeder, it is necessary to calibrate the feeding step to ensure the accurate positioning of materials and prevent the size deviation or waste caused by over-feeding and under-feeding.

Adjustment of pressing force: For irregular or easily warped parts, it is necessary to set the pressure of the pressing device reasonably to prevent the material from shifting and wrinkling in the stamping process.

Real-time quality monitoring

First article inspection: the first article must be made before each batch of production, and the key dimensions (such as aperture, spacing and bending angle) and surface quality (no burr, indentation and deformation) must be checked against the drawings, and batch production can be carried out only after it is qualified.

Process sampling inspection: sampling inspection shall be conducted every certain number in production, focusing on the problems such as mold looseness and material fatigue deformation caused by continuous stamping, so as to avoid batch scrapping.

Burr control: The stamping parts of electronic products have strict requirements on burr height (usually ≤0.03mm). If burrs are out of tolerance, it is necessary to repair the cutting edge of the die or adjust the stamping gap in time.

Prevent deformation and damage

Thin parts are easy to deform after stamping, so it is necessary to use special fetching fixture or sucker to avoid external force extrusion during manual grasping.

Stacking of finished products should be layered with paper, and the stacking height should be controlled to prevent the lower parts from being deformed by compression; Parts requiring electroplating and spraying shall be packaged separately to avoid surface scratches.

III. Equipment Operation and Safety Specifications

Equipment debugging and inspection

Before starting, check whether the clutch, brake and safety light curtain of stamping equipment are normal, ensure the stable operation of the equipment, and prevent accidents such as die sticking and out-of-control punching machine.

Adjust the stroke and closing height of the equipment according to the size of the parts to avoid mold damage or parts overshoot caused by excessive stroke.

Safety operation requirements

Operators should wear protective gloves and goggles, and it is forbidden to put their hands into the mold area when the equipment is running, and strictly abide by the "two-handed operation" specification.

Stop the machine and cut off the power supply when cleaning the waste and adjusting the mold to prevent safety accidents caused by misoperation.

IV. Follow-up Treatment and Environmental Requirements

Deburring and cleaning

For deburring the stamped parts, manual grinding, vibration grinding, sand blasting and other methods can be used to ensure smooth edges and avoid burrs from affecting subsequent assembly or scratching other parts.

When cleaning oil stains and iron filings on the surface of parts, especially conductive parts, it is necessary to ensure that there are no residual impurities on the surface to prevent the conductive performance from being affected.

Environmental control

The processing workshop should be kept clean and dry, and the temperature and humidity should be controlled within a reasonable range to prevent mold rust and material oxidation.

The machining area of micro parts should be isolated separately to avoid parts being lost or mixed with impurities.

Five, special process matters needing attention

If stamping parts need bending, stretching and flanging, it is necessary to pay attention to the bending radius (to avoid cracking caused by being less than the thickness of the material) and the stretching coefficient (to distribute the deformation reasonably), and if necessary, increase the annealing process to eliminate the internal stress of the material.

For precision parts with holes and special shapes, it is necessary to ensure the distance between the hole position and the edge to prevent the hole position from deformation or edge tearing during stamping.