Metal stamping parts are one of the core components in modern industrial manufacturing and are widely used in relays, switches, contactors, circuit breakers, fuses, capacitors, power equipment, automobiles, photovoltaic new energy, energy storage systems, and other industries. Its forming process uses metal strips as raw materials, and completes one or more deformations on high-speed punching equipment through stamping dies to obtain parts of the required shape. With the increasing manufacturing requirements, the accuracy, efficiency, and automation level of the stamping process, as well as the subsequent surface treatment technology, have become important standards for measuring the quality and performance of stamped sheet metals.
Analysis of commonly used metal strips and their stamping performance
Copper stamping parts
Copper strips are highly conductive and suitable for manufacturing electrical connectors, relay contacts, power terminals and other products with extremely high requirements for conductivity. The material is soft, ductile and has excellent formability.
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Brass stamping parts
Brass strips are copper-zinc alloys with good comprehensive mechanical properties. They are suitable for manufacturing electrical switch accessories, connection terminals, etc. The surface finish is high after stamping and is suitable for electroplating.
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Aluminum alloy stamping parts
Aluminum alloy strips such as AL3003, AL5052, AL6005-T5, etc. are widely used in photovoltaic brackets, radiators, and lightweight structural parts. They have excellent corrosion resistance and processability, low density, and are suitable for batch stamping.
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Stainless steel stamping parts
Mainly using 304, 316 and other stainless steel strips, with high hardness and strong corrosion resistance, they are widely used in electrical housings, automotive structural parts, etc., and have high requirements for mold materials and strength.
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Electrical pure iron stamping parts
Commonly used materials such as DT4E, DT4C, etc. have excellent soft magnetic properties and are irreplaceable magnetic parts materials for manufacturing relay yokes, armatures, electromagnet cores, etc. Suitable for cold heading, stamping and various electroplating surface treatments.
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Table: Comparison of stamping properties of five typical metal strips
| Material properties | Copper strip | Brass strip | Aluminum alloy strip | Stainless steel strip | Electrical pure iron strip |
| Conductivity (%IACS) | 100 | 28-45 | 50-60 | 2-3 | 15-18 |
| Tensile strength (MPa) | 200-300 | 300-500 | 100-300 | 500-700 | 300-400 |
| Elongation (%) | ≥40 | 20-40 | 15-30 | 30-45 | 25-35 |
| Hardness (HV) | 60-80 | 100-150 | 30-100 | 150-250 | 80-120 |
| Difficulty of stamping | Medium | Easy | Easy to medium | Difficult | Medium |
| Typical thickness (mm) | 0.1-3.0 | 0.1-2.5 | 0.2-4.0 | 0.1-2.0 | 0.2-1.5 |
| Main applications | Electrical connectors | Electronic components | Photovoltaic brackets | Precision structural parts | Electromagnetic components |
Comparison of stamping process methods: single-station stamping vs progressive die stamping
1. Single-station stamping
Process characteristics: Each process of the product is completed in steps and relies on manual loading and unloading.
Advantages:
Simple mold structure and low development cost;
Suitable for small batch, sample, or non-standard parts production;
Disadvantages:
Low efficiency and high labor dependence;
Poor dimensional consistency and easily affected by human operation;
Typical applications: Small batch copper stamping parts, electrical pure iron samples, stainless steel custom parts, etc.
2. Progressive die stamping
Process characteristics: Through continuous feeding, multiple mold cavities complete punching, bending, stretching, cutting and other processes in one.
Advantages:
High efficiency: hundreds of pieces can be stamped per minute;
High precision: excellent dimensional consistency and small in-mold control error;
Composite functions such as in-mold tapping and in-mold riveting can be integrated;
Disadvantages:
High mold development cost and long cycle;
Higher requirements for material thickness, tolerance, and hardness;
Typical applications: large quantities of brass stampings, aluminum alloy photovoltaic bracket accessories, stainless steel housings, electrical terminals, and other standardized products.
Table: Comparison of key indicators of single-station stamping and progressive die stamping
| Comparison indicators | Single-station stamping | Progressive die stamping | Difference analysis |
| Production efficiency (strokes/minute) | 5-15 | 60-120 (high-speed progressive die can reach 800+) | The progressive die is 5-80 times faster |
| Dimensional tolerance (mm) | ±0.1 | ±0.02 | The progressive die has 5 times higher precision |
| Labor requirements | 1 person per machine | 1 person can take care of 3-5 machines | Progressive die saves 80%+ labor |
| Mold cost | Low (thousands-tens of thousands) | High (100,000-1 million+) | The progressive die is 10-100 times higher |
| Production preparation cycle | Short (1-2 weeks) | Long (4-12 weeks) | The progressive die is 3-6 times longer |
| Applicable output | <50,000 pieces/year | >100,000 pieces/year | The progressive die is suitable for large quantities |
| Material utilization rate | Low (60-75%) | High (75-90%) | Progressive die is 15-30% higher |
The influence of die material and design on stamping quality
High-precision stamping must rely on high-performance dies. Whether the die design is reasonable or not directly determines the consistency, life, and stability of the stamped parts. Common die materials include:
SKD11, DC53, ASP23, and other high-strength cold-working steels: suitable for high-hardness metal stamping;
Carbide inserts: used for batch stamping of high-strength stainless steel or electrical pure iron;
Key points of die structure design:
Ensure that the punch is coaxial with the template to prevent deviation;
Set guide pins and guide pillars to reduce stamping errors;
Reasonably arrange the blanking and forming sequence to avoid cracks or rebound.
Table: Material selection and performance requirements for key components of progressive dies
| Mold components | Recommended materials | Hardness requirements | Surface treatment | Life indicators |
| Punch | SKD11/SLD | HRC60-63 | TiN/TiCN coating | 1-3 million times |
| Punch die | SKH51/ASP23 | HRC60-62 | Mirror polishing | 2-5 million times |
| Bending punch | DC53 | HRC58-60 | Chrome plating | 500,000-1 million times |
| Guide pin and guide sleeve | SUJ2 | HRC58-60 | Superfinishing | 10 million times+ |
| Mold frame body | FC300/P20 | HB280-320 | - | - |
| Ejector rod | SKD61 | HRC50-52 | Nitriding treatment | 3 million times+ |
Quality control methods for stamping products
High-quality custom metal stampings not only come from high-quality materials and molds but also rely on sophisticated process control:
Raw material inspection: Strip materials must have clear thickness tolerance and surface quality requirements;
Mold cycle maintenance: Regularly clean and replace worn parts to extend mold life;
Stamping parameter setting: Reasonably adjust pressure, stroke speed, and feeding spacing;
First piece and inspection system: Each batch of products must be measured and inspected;
Automated monitoring system: Detect interruption, dislocation, mold abnormality, etc. during stamping.
Surface treatment process of metal stamping products
After the precision metal stampings are formed, surface treatment is a key process to improve the corrosion resistance, aesthetics, and functionality of the products. Common methods include:
1. Electroplating treatment
Nickel plating, tin plating, gold plating: Commonly used for copper stamping parts and brass stamping parts to enhance conductivity and oxidation resistance;
Zinc plating, chrome plating: Suitable for structural corrosion protection, such as aluminum alloy stamping parts or stainless steel structural parts appearance enhancement.
2. Anodizing
Mainly used for aluminum alloy stamping parts, such as photovoltaic bracket connectors, to improve surface hardness, corrosion resistance and appearance consistency.
3. Passivation
Applied to stainless steel stamping parts to improve their chemical corrosion resistance and extend service life.
4. Spraying/sandblasting
Used for structural parts or shell products to increase friction or aesthetic decorative effects, commonly seen in battery bracket stamping parts in the new energy industry.
5. Deburring and polishing
Precision stamping parts (such as pure iron stamping parts and electrical contact accessories) must be deburred and polished to improve assembly accuracy and functionality.
Application fields and solutions for stamping parts
Electrical industry: Copper stamping parts and brass stamping parts are used for low-voltage switches, contactors, and relay structural parts.
New energy industry: Aluminum alloy stamping parts are used for solar brackets and energy storage connection structures.
Automotive industry: Stainless steel stampings are used for vehicle structures and battery module brackets.
Electromagnetic components: Electrical pure iron stampings are used for magnetic components such as relay armatures, yokes, and electromagnet cores.
In the era of efficient manufacturing, the quality of metal stampings not only comes from precise mold design and high-performance metal strips but also must be combined with advanced stamping equipment and a scientific quality control system. Single-station stamping is suitable for flexible proofing, while progressive die stamping represents the future direction of high productivity, high consistency, and low manpower dependence. At the same time, high-quality surface treatment processes give stampings more functionality and adaptability.
Whether it is precision copper stampings, standardized brass stampings, lightweight aluminum alloy stampings, high-strength stainless steel stampings, or electrical pure iron stampings for magnetic guides, we always take technology as the core to provide customers in various industries with high-quality, customized, and batched metal stamping products. Overall solution.
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