From 0.015 kg to 80 kg: What a 300T–4000T Electric Screw Press Line Can Actually Forge
Release time：
2026-10-28
From 0.015 kg to 80 kg: What a 300T–4000T Electric Screw Press Line Can Actually Forge
Figure 1. A hot forging press in operation. The right tonnage for the right part — that is the first engineering decision on every RFQ.
The very first question on almost every forging RFQ is not about price. It is not about certification. It is: "Can you actually make my part?"
And "can you" is not a yes/no. It is a range — of tonnage, of part weight, of geometry complexity, of material. A forging shop that runs a single 1,000-ton press cannot make a 15-gram fastener economically. A shop that only runs small cold headers cannot make an 80-kg steering knuckle.
After 28 years of running hot forging lines for automotive, rail, mining and material-handling customers, we thought it was worth writing down exactly what our 11 electric screw press lines are built to do.
Tonnage and Part Weight: The Relationship Explained
Forging tonnage is not the same as part weight. A press rated at 300 tons can still produce an 80-kg part if the projected area in the die is small. Conversely, a 4,000-ton press can be under-utilized on a tiny part.
The practical rule of thumb:
Small parts (0.015–0.5 kg): bolts, pins, small lever arms, small gear blanks — run on 300T–630T presses at high stroke rates
Medium parts (0.5–10 kg): shift forks, door hinges, control arms, small brake levers — run on 630T–1,600T presses
Large parts (10–80 kg): steering knuckles, large link arms, rail brake components, structural brackets — run on 1,600T–4,000T presses
Light-alloy parts (up to ~100 kg): aluminum and copper forgings deform more easily, so a given press can handle a larger non-ferrous part
Our eleven electric screw press lines span 300T to 4,000T, which means we cover essentially the entire range that automotive, rail and industrial customers actually buy.
0.015 kg: The Smallest Parts We Forge
Fifteen grams is not a typo. We run small precision forgings — small pins, mini lever arms, detailed fastener-like components — on our smaller presses at high volume. These are the parts that look trivial on a drawing but fail catastrophically if the grain flow is wrong: a 15-gram parking pawl in a transmission that lives for 200,000 km, a small hinge pin that must not develop play over 100,000 door openings.
For these parts, the challenge is not tonnage. It is consistency — running the same 15-gram part to the same tolerance on lot 1 and lot 100,000. That is what closed-loop press control, in-process gauging and dedicated rotary-transfer machining cells are for.
Figure 2. Forged components across the weight range — from small levers and brackets to structural arms. One plant, eleven press lines, one quality system.
Up to 80 kg in Steel, 100 kg in Aluminum
At the other end, our largest presses handle steel forgings up to roughly 80 kg, and aluminum or copper forgings up to the 100-kg class. These are the structural parts that carry vehicle loads: steering knuckles, large suspension control arms, rail brake levers and clevises, mining-machinery brackets, drive-line yokes.
For these large parts, the engineering challenge is different. It is not just about having a big press. It is about:
Heating control. A 50-kg billet has to reach forging temperature uniformly, or the die sees a cold spot and the part cracks.
Die life. Large dies are expensive; running them at the right temperature and lubrication frequency decides whether a die lasts 10,000 shots or 50,000.
Heat treatment. An 80-kg section hardens differently than a 0.5-kg section. Our in-house heat treat is sized and controlled for the full range.
Why Electric Screw Presses, Not Hammers or Mechanical Presses
You will see three forging technologies in industrial shops today: pneumatic hammers, mechanical eccentric presses, and electric screw presses. Each has its place.
We run electric screw presses across the 300T–4,000T range. The reason matters to your part:
Energy per blow is programmable. The same press can deliver a soft, fulling blow or a final, precision sizing blow — in the same die, on the same part. That control is what holds tight tolerances across complex geometries.
No fixed stroke. Mechanical presses have a fixed stroke length; screw presses adjust on the fly. That flexibility matters when you are developing a new die and need to dial in the deformation step by step.
Lower die shock. Screw presses load the die more gradually than hammers, which extends die life on expensive tooling — and that savings flows back to your piece price over a multi-year program.
Figure 3. Metrology on a finished part. Whether it weighs 15 grams or 80 kilograms, every lot leaves with the same inspection documentation.
What This Means for Your Next RFQ
If you are qualifying a forging supplier, the practical questions are simpler than the marketing brochures suggest:
What tonnage range does the shop actually run? A one-press shop is a specialist. An 11-line, 300T–4,000T shop is a partner that can grow with your program.
What is the smallest and largest part they actually ship? Ask for examples, not specs.
Is machining in-house? A 5-kg shift fork and a 50-kg knuckle both need finishing. If forging and machining are in different buildings, someone owns the dimensional gap.
Can they hold the tolerance you drew? Send a drawing. Get a DFM review. The answer you get back is the supplier.
What Liju Actually Runs
For reference, this is the floor we open to our customers' auditors:
Eleven electric screw press lines, 300T to 4,000T
Part weight range: 0.015 kg to 80 kg in steel; up to 100 kg in aluminum and copper
Cold forging and heading cells alongside hot forging
15 CNC machining centers and 2 rotary-transfer dedicated machines, integrated under one roof
IATF 16949, ISO 9001, ISO 14001 certified since decades of European and North American programs
28 years of history — founded 1998, serving Knorr-Bremse, Edscha, Witte, AL-KO, Emerson and Tier-1 programs across Germany, Spain, Switzerland, Finland, the USA and Canada
Finished-part inventory in Germany and the USA, for 48–72 hour replenishment on 200+ active part numbers
A second plant under construction in Xuancheng, adding 10 more lines to support European and North American volume growth
Send us your drawings. Whether your part weighs 15 grams or 80 kilograms, our engineering team returns a written DFM review within 48 hours — feasibility, recommended process, tooling lead time and indicative piece-price range.
📩 liju0520@outlook.com · 🌐 www.lijuforging.com · 📞 +86 152-5172-5883 · Warehouses: Germany & USA
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