大型トン数プレスブレーキ:重負荷曲げのための完全選択ガイド

A large tonnage press brake is not simply a bigger version of a standard machine — it is an entirely different class of equipment, built for material thicknesses, bend lengths, and force demands that standard press brakes cannot meet. This guide introduces a clear four-class tonnage framework to help you match the right machine to your specific application. By the end, you will know which tonnage class fits your work, what specifications to evaluate, and what configuration to request from your supplier.

プレスブレーキで大トン数とみなされるものは何でしょうか

Large tonnage press brakes start at 300 tons. Most fabrication shops operate in the 100–400-ton range for everyday work, but 300T marks the threshold where machine design, frame engineering, and CNC system requirements shift significantly.

To make selection easier, the industry can be divided into four practical classes:

クラス	トン数レンジ	典型的な板厚	主な用途
ヘビー	300–499T	6–12mm	Structural steel, construction components
スーパーヘビー	500–799T	12–20mm	Pressure vessels, heavy machinery
ウルトラヘビー	800–1,499T	20–35mm	Wind towers, large industrial frames
メガ	1,500T+	35mm+	Shipbuilding, tandem configurations

No competitor article defines these classes this way — and most buyers end up over-specifying or under-specifying because no one has drawn these lines clearly before.

大トン数プレスブレーキに依存する産業

Large tonnage press brakes serve industries where material thickness and part size exceed the limits of standard equipment. The global press brake machine market sits at USD 800.2 million in 2026 and is projected to reach USD 1,211.2 million by 2033 — growth driven almost entirely by heavy industrial demand.

The key sectors and their tonnage requirements are:

• 造船 — Hull plating and bulkhead panels; typically 500T to 2,000T+
• 風力エネルギー — Tower flanges and base plate rings; typically 800T to 1,500T
• 重工 — Structural beams, columns, and bridge components; typically 400T to 800T
• 鉄道と交通 — Bogie frames and car body panels; typically 300T to 600T
• 圧力容器と石油化学 — Thick-wall cylinder shells; typically 600T to 1,200T
• 重機製造 — Crane arms, excavator frames; typically 400T to 800T

標準的な機械が不十分な理由

A standard press brake cannot sustain the frame rigidity needed under repeated extreme loads. At full bed length, even rated-capacity machines derate to 60–70% of their stated tonnage — meaning a 250-ton standard machine may only deliver 150–175 effective tons across a long bend. Large tonnage machines are engineered with reinforced side frames, precision-ground guideways, and active crowning systems specifically to hold accuracy under these conditions.

The 4 Tonnage Classes Explained

Understanding which class fits your work prevents both under-investment and overcapacity. Each class carries different machine design requirements, control system demands, and tooling standards. CNC press brakes are available from 40 tons for light-gauge work all the way to over 2,000 tons for heavy plate operations.

Heavy Class (300–499T)

The Heavy Class covers the majority of structural steel fabrication shops. These machines handle 6–12mm mild steel or 4–8mm stainless at bend lengths of 3–5 meters. They are the entry point for bridge sub-components, heavy cabinet frames, and large agricultural equipment panels.

A buyer in this class needs a hydraulic or hybrid servo-hydraulic drive. Full electric press brakes are not commercially viable at this tonnage range today.

Super-Heavy to Mega Class (500T and Above)

Above 500T, hydraulic drive is the standard. Machines in this range are built on heavier steel weldments, run larger cylinder bores, and require active hydraulic crowning to maintain angle consistency across long bends.

The Mega Class (1,500T+) almost always involves tandem or synchronized configurations. A 6,500-ton / 18-meter tandem CNC press brake has been successfully developed and deployed for ultra-large shipbuilding applications — one of the largest configurations in the world.

クラス比較表

クラス	トン数	板の厚さ	ベッドの長さ	構成	ベスト・フォー
ヘビー	300–499T	6–12mm	3–5m	シングル	Structural steel, construction
スーパーヘビー	500–799T	12–20mm	4–7m	シングル	Pressure vessels, machinery
ウルトラヘビー	800–1,499T	20–35mm	6–10m	Single / Tandem	Wind towers, offshore
メガ	1,500T+	35mm+	10m+	タンデム	Shipbuilding, heavy plate

大トン数の曲げに使われる機械の種類

Not all large tonnage press brakes use the same drive system. The right type depends on your tonnage class, production volume, and part complexity.

• 油圧式CNCプレスブレーキ — the dominant type above 300T; delivers consistent force across full bed length; preferred for 500T+ due to proven reliability under extreme load
• ハイブリッドサーボ油圧式 — available up to approximately 400–500T; offers energy savings over full hydraulic; suitable for shops that mix thick and medium plate work
• タンデムプレスブレーキ — two synchronized machines operating in parallel; used when a single machine cannot cover the required bed length; common above 8 meters
• フル電動プレスブレーキ — not yet commercially available above 300T in standard production; limited to lighter applications

In the 300–500T and above 500T market segments, hydraulic remains the dominant drive category.

大型マシン1台よりタンデムを選ぶべき時

A tandem setup makes sense when your bend lengths consistently exceed 8 meters, your part geometry prevents a single-machine approach, or your production volume demands simultaneous bending of multiple components. The tradeoff is floor space, synchronization complexity, and initial investment. In our experience assessing heavy-fabrication configurations, buyers in shipbuilding and offshore wind almost always move to tandem above 6-meter bend requirements — a single 1,000-ton machine at that length would require a bed engineering spec most standard suppliers cannot meet.

購入前に評価すべき主な仕様

Selecting a large tonnage press brake on rated tonnage alone is the most common buyer mistake. Several specifications matter equally — and some directly affect how much usable force you actually get. For a detailed breakdown by machine size, the プレスブレーキ容量ガイド covers the core specs in full.

厚板のトン数計算

The DIN standard formula for bending force is:

F=1.54×Rm×S2×LV×1000 kNF=V×10001.54×Rm×S2×lkN

Where Rm = tensile strength (MPa), S = thickness (mm), L = bend length (mm), V = V-die opening (mm).

For a practical example: bending 20mm mild steel (Rm = 400 MPa) at 3,000mm length with a 160mm V-die opening gives approximately 924 kN (94 tons per meter × 3m). Add the recommended 30–50% overhead buffer, and you need a machine rated at a minimum of 400T for this job alone. Use the トン数計算機 to run your own figures before specifying.

Key specifications to check beyond rated tonnage:

• ベッド全長での使用可能なトン数— 満床時の定格の60〜70%まで減衰
• ベッドの長さ — standard 4–14 feet; custom lengths required above that
• ストローク長と開口高度— 大きな金型クリアランスに不可欠です
• フレーム剛性評価 — the single most overlooked spec in large tonnage; unwavering frame stiffness preserves accuracy under extreme load
• クラウンシステム— 500Tではアクティブ油圧クラウニングは交渉不可です

大型トン数プレスブレーキ上のCNC制御システム

A large tonnage machine without the right CNC system loses much of its precision advantage. Control system selection directly affects bend repeatability, setup time, and automation readiness.

• デレム DA66S — 2D/3D graphical touch-screen programming, 24" TFT display, sensor bending and correction interface; the preferred system for complex thick-plate work and Super-Heavy to Ultra-Heavy class machines
• デレム DA53T — 15" touch-screen, solid for standard Heavy Class production runs with crowning control and closed/open-loop valve support
• ESA S840/S850 — up to 6 axes, EtherCAT/CANopen interface, real-time OS; used in automated heavy-tonnage production lines

For machines above 500T, a minimum of 4-axis backgauge control is recommended. Complex part programs with multiple bend sequences require the additional axis flexibility to position thick plate accurately between bends. The 4-vs-8-axis guide explains axis configuration in detail for buyers weighing automation investment.

適切な大型トン数プレスブレーキの選び方

Follow this six-step framework to reach the right specification:

1. 最大曲げ力を計算してください — use the DIN formula above with your thickest material, longest bend, and tightest die opening
2. 30〜50%のトンバッファーを追加してください計算された最大値を超える
3. 結果をトン数クラスに合わせてください — use the class table above to identify Heavy, Super-Heavy, Ultra-Heavy, or Mega
4. Decide: single machine or tandem — if your bend length regularly exceeds 8 meters, tandem is the practical answer
5. CNCシステムを選択 — DA66S for complex geometry; DA53T for production runs; ESA S840 for automation integration
6. フレームの剛性とベッドの減格仕様を確認してください — ask your supplier for the usable tonnage at full bed length, not just rated capacity

Based on assessments of heavy-fabrication projects, the biggest mistake buyers make is specifying for today's job, not the next five years of planned capacity. A machine that runs at 90% of rated tonnage daily will wear faster and hold less accuracy over time. Buying one class above your current maximum job is rarely a bad decision when the machine will run for 20+ years.

探索重装備プレスブレーキ構成または300-ton CNC press brake as starting points for the Heavy Class. For the full CNC press brake product range, the CNCプレスブレーキの概要 covers all available configurations.

FAQ

Q1: What is considered large tonnage for a press brake?
Large tonnage press brakes are generally defined as machines rated at 300 tons or above. Most standard fabrication shops operate in the 100–400-ton range, making 300T the point where machine design, frame engineering, and CNC requirements shift to heavy-duty specifications. Machines above 1,500T are typically tandem configurations used in shipbuilding and offshore industries.

Q2: What industries use large tonnage press brakes?
The primary industries are shipbuilding, wind energy, heavy construction, pressure vessel manufacturing, railway equipment, and heavy machinery production. Each sector has different tonnage requirements — shipbuilding often demands 500T to 2,000T+, while structural construction work typically falls in the 400T to 800T range.

Q3: What is the difference between a 300-ton and 500-ton press brake?
A 300-ton machine handles 6–10mm plate at standard bed lengths and suits structural steel fabrication. A 500-ton machine enters the Super-Heavy class, handling 12–20mm plate with longer bed lengths, and is built with heavier frame construction and larger hydraulic cylinders. The CNC system requirements and tooling specifications also differ significantly between the two classes.

Q4: Can a large tonnage press brake also handle thin sheet metal work?
Technically yes, but it is not ideal. Operating a 500T machine at 5% of its capacity creates control sensitivity challenges and increases die wear risk on thin material. For shops that run both thick plate and thin sheet work, a two-machine approach — one large tonnage and one standard — is far more practical and cost-effective.

Q5: What is the largest press brake ever built?
A 6,500-ton / 18-meter tandem CNC press brake has been developed for ultra-large shipbuilding applications. This configuration represents the upper boundary of current commercial press brake engineering and is used for bending hull plates and structural sections that no single-machine setup can handle.

次に何をすべきか

Large tonnage press brake selection comes down to three things: the right tonnage class for your material and application, a machine configuration that matches your bend length requirements, and a CNC system that fits your production complexity. Hydraulic drive dominates above 300T for good reason — reliability and force consistency under extreme load are non-negotiable. Before contacting a supplier, calculate your required force, add 30–50% overhead, and identify whether a single machine or tandem setup fits your facility. The ヘビーデューティプレスブレーキのレンジ at JS RAGOS covers the Heavy to Ultra-Heavy classes with full CNC configuration options.