Brief introduction: processing specifications of narrow-band copper sheet
The processing specifications of narrow-band copper sheet usually cover key parameters such as thickness, width, length, tolerance range, surface state, mechanical properties, etc., which vary according to processing technology and application scenarios. The following is a brief introduction of common machining specifications:
1. Thickness specification
General scope:
Ultra-thin specification: 0.01 mm ~ 0.1 mm (such as electronic shielding and precision components).
General specification: 0.1 mm ~ 1.0 mm (such as connector, heat sink, elastic parts).
Thick specifications: 1.0 mm ~ 3.0 mm (such as structural parts and conductive bars).
Tolerance accuracy:
High-precision machining (such as continuous rolling process) can be controlled within ±0.005 mm ~ ±0.02 mm, and the general accuracy is about 0.05 mm.
2. Width specification
General scope:
Extremely narrow band: 1 mm ~ 20 mm (such as precision electronic components and micro-springs).
Narrow band: 20 mm ~ 100 mm (such as terminal, lead frame, battery connecting piece).
Tolerance accuracy:
The width tolerance is usually ±0.05 mm ~ ±0.1 mm, and the high-precision cutting process can be controlled within 0.02 mm.
3. Length specification
Roll length:
Usually supplied in rolls, the length can reach several hundred meters to several thousand meters, depending on the thickness and equipment capacity (for example, the length of thin strips can reach several thousand meters, and the length of thick strips may reach several hundred meters).
Length to length:
It can be cut into straight length strips according to requirements, with a common length of 1000 mm ~ 5000 mm and a tolerance of ±1 mm ~ ±5 mm generally.
4. Surface state
Finish:
Mirror level: surface roughness Ra ≤ 0.2 μm (suitable for high-end fields such as optics and electronic display).
Brightness level: Ra ≤ 1.6 μm (general electronic and hardware products).
Sub-gloss level: Ra ≤ 3.2 μm (structural parts, non-appearance parts).
Surface treatment:
It can be cleaned, plated (such as nickel plating, tin plating and gold plating) and oiled (rust prevention) to meet the requirements of different corrosion resistance and conductivity.
5. Mechanical properties
Hardness and state:
Soft state (O state): low hardness (such as HV 50~80) and good ductility, suitable for deep drawing and bending.
Semi-hard state (1/2H): medium hardness (HV 100~150), giving consideration to strength and formability.
Hard state (H state): High hardness (HV 180~250), used in scenes requiring high elasticity or strength (such as springs and buckles).
Tensile strength:
The tensile strength of pure copper (such as T2 copper) is usually 200~300 MPa, which can be increased to more than 350 MPa after work hardening.
6. Material brand and characteristics
Common brands:
Pure copper: T2, TU1 (high purity, excellent electrical and thermal conductivity).
Brass: H62, H65 (copper-zinc alloy, high strength, easy cutting).
Bronze: QSn6.5-0.1 (tin bronze, good wear resistance and elasticity).
White copper: B10, B30 (copper-nickel alloy, strong corrosion resistance).
Special requirements:
Materials with high conductivity (such as conductivity ≥100% IACS), high corrosion resistance, lead-free and environmental protection (in line with RoHS standards) can be customized.
7. Processing technology and equipment
Main process:
Rolling: high-precision thickness control is realized by continuous rolling mill, which is suitable for mass production.
Cutting: The wide copper strip is cut into narrow bands by precision cutting machine, and the edge burr can be controlled to be less than or equal to ≤0.01 mm.
Annealing: adjust the hardness of materials (such as soft state and hard state) through continuous annealing process.
Equipment capacity:
Some enterprises (such as Taitetong Copper in the case) can realize the automatic production of ultra-narrow strip (width ≤10 mm), and the accuracy reaches micron level.
application area
Narrow-band copper sheet is widely used in:
Electronics industry: connectors, terminals, lead frames, flexible printed circuit board (FPC).
New energy sources: lithium battery tabs, pv ribbon, and conductive parts of energy storage equipment.
Automobile/household appliances: motor windings, temperature control elements, connectors.
Precision machinery: micro-springs, instrument parts, sensor parts.
Customized service
Most processing enterprises can provide personalized specifications according to customer drawings or samples, such as non-standard thickness, width, special surface treatment or mechanical properties requirements, and need to communicate with suppliers in advance to confirm the feasibility of the process.
