Штамповка листового металла: Процесс, Допуски & Проектирование Guide

Основные выводы

• Штамповка is the fastest way to produce flat and formed Листовой металл parts at scale — cycle times as low as 1 second per part with progressive dies, making it the go-to process for brackets, clips, shields, and enclosures above 5,000 units.
• Процесс choice depends on part geometry and volume — blanking and piercing for flat parts, Гибка for simple forms, progressive die for complex multi-feature parts, deep drawing for hollow shells.
• Standard Штамповка Допуски are ±0.13 mm (0.005″) for hole diameters, ±0.25 mm (0.010″) for edge-to-hole positions — tighter than laser-cut-only parts because the die controls dimensions repeatably.
• Die cost dominates at low volume — a simple single-stage die costs $800–$3,000; a progressive die with 8–12 stations runs $8,000–$25,000. Below 1,000 units, Лазерная резка + CNC Гибка is usually cheaper.
• Burr direction is a critical DFM detail — stamped edges always have a burr on one side. Specify burr direction on the drawing to avoid assembly interference.
• Материал choice affects both tool life and part cost — mild steel (SPCC) is the most stampable; stainless and high-strength steels accelerate die wear and need more frequent tool maintenance.

Что такое штамповка листового металла?

Листовой металл Штамповка is a cold-forming process that uses a punch and die set in a mechanical or hydraulic press to cut, bend, or draw flat Листовой металл into finished parts. Unlike Мы специализируемся на which removes material, or Лазерная резка which only cuts profiles, Штамповка simultaneously cuts and forms — producing complete parts with holes, bends, tabs, and embossed features in a single press stroke or a sequence of progressive stations.

The process is ideal for parts that are flat or shallow-formed, produced in quantities above 1,000–5,000 units, and require consistent dimensions across a long Производство run. Common stamped parts include mounting brackets, electrical contacts, spring clips, EMI shields, automotive body panels, and appliance housings.

In the world of custom обработке на ЧПУ, Штамповка fills the gap between low-volume laser-cut prototyping and high-volume dedicated Производство. A fabricator with in-house Штамповка capability can offer you both prototype flexibility and Производство economics without switching suppliers mid-project.

Четыре основных типа штамповки листового металла

Лучше всего для: Blanking when you need flat parts with precise hole patterns. Progressive die when part count exceeds 10,000 and the part has 3+ features. Deep drawing when you need hollow cylindrical or box-shaped parts.
Avoid when: Progressive die below 5,000 units — die amortization per part makes unit cost higher than laser + bend. Deep drawing for materials with low elongation (some Алюминиевый сплавs crack at draw ratios above 1.8).

Допуски штамповки: что можно реально ожидать

Допуски in Штамповка are driven by the die, not the operator — which means they are inherently more repeatable than manually positioned Лазерная резка or press brake Гибка. However, they vary significantly by feature type:

When your part has features that must locate relative to each other within a tight tolerance, specify GD&T datum references on the drawing rather than linear ± dimensions. This tells the die designer which features to use as the primary locating surfaces and which Допуски can stack.

Лучше всего для: Using standard Допуски for all non-critical features — tighter Допуски increase die cost by 20–40%. Reserve precision Допуски for hole patterns that locate mating components, connector cutouts, and press-fit features.
Avoid when: Specifying ±0.05 mm on overall length of a 300 mm part — thermal expansion alone can shift dimensions by 0.03 mm per 10°C temperature change.

Выбор материала для штампованных деталей

Лучше всего для: SPCC steel for 90% of general Штамповка work — it is the most forgiving, least expensive, and longest tool-life material. 5052 aluminum when weight matters. Spring steel only when the part must function as a spring.
Avoid when: Specifying 316 stainless for a simple indoor bracket — the material premium and accelerated die wear add cost with no functional benefit over 304.

Правила DFM для штампованных деталей

Good Штамповка DFM reduces die cost, extends tool life, and improves part consistency. These six rules apply to nearly every stamped part:

1. Hole diameter must be at least 1× Толщина материала. Punching a hole smaller than the Толщина материала causes punch deflection and premature breakage. For a 1.5 mm steel sheet, the smallest hole is 1.5 mm diameter.
2. Space holes at least 2× Толщина материала from each other and from the part edge. Closer spacing causes the web between holes to distort or tear during punching. For 1.0 mm stock, keep holes at least 2.0 mm apart.
3. Inside bend radii should be at least 1× Толщина материала. Tighter radii risk cracking on the outside of the bend, especially with aluminum and stainless. For 5052 aluminum, use 1.5× Толщина материала as the minimum.
4. Keep features at least 3× Толщина материала from bend lines. Holes, slots, and tabs too close to a bend will distort as the material stretches. For a 1.2 mm part, keep features 3.6 mm from any bend.
5. Specify burr direction on the drawing. Every punched edge has a burr on the die side and a clean shear on the punch side. Use an arrow or note (“burr this side”) — this costs nothing but prevents assembly problems.
6. Use full-radius corners (not sharp) on blanked profiles. Sharp internal corners concentrate stress and accelerate die wear. Minimum corner radius = 0.5× Толщина материала for steel, 1× for aluminum.

Штамповка vs лазерная резка + гибка на ЧПУ: когда переключаться

One of the most common questions from buyers is when to move from laser-cut prototypes to Штамповка Производство. The decision comes down to volume, part complexity, and tolerance requirements:

The crossover point where Штамповка becomes cheaper than Лазерная резка typically falls between 2,000 and 5,000 units, depending on part size and complexity. Below this volume, a good обработке на ЧПУ shop can produce parts economically with Лазерная резка and CNC Гибка — and you avoid the upfront die investment.

Заключение

Листовой металл Штамповка rewards volume and punishes low quantities with tooling amortization. The key to a successful Штамповка project is matching the process to your part: blanking for simple flat parts, progressive die for complex high-volume components, deep drawing for hollow shells. Start with laser-cut prototypes to validate fit and function. Once your design is stable and volumes justify it, transition to Штамповка for the best combination of unit cost, speed, and part-to-part consistency.