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STC Servo Series (C‑Frame Double Crank) Solves High‑Volume, High‑Precision Stamping Challenges

2026-05-11

1. Project Overview

A large home appliance manufacturer in South China (annual output 12 million units) produces stainless steel & cold‑rolled steel structural parts (brackets, reinforcing plates, chassis components).

Material: 1.0–3.0 mm CR steel / 304 SS

Tolerance requirement: ±0.015 mm

Production mode: high‑volume progressive die + large single‑stroke parts

Before upgrading, the workshop used 160–200 ton mechanical C‑frame presses, suffering from:

Poor parallelism & deflection under full load
Fixed speed/curve → cracks & high defect rate
High noise (82–85 dB) & high energy use
Long setup time & short mold life

In early 2024, the customer purchased 3 units of Qiaosen STC‑200sv (200‑ton C‑frame double crank servo presses) to replace old mechanical presses.

2. Qiaosen STC Servo Series – Key Specifications & Advantages

STC‑sv = C‑frame / double crank / wide bed / servo‑driven

Range: 110–315 tons

Core Technical Data (STC‑200sv)

Nominal capacity: 200 tonf
Frame: One‑piece heavy steel, stress‑relieved
Fuselage deflection (110% load): ≤0.025 mm/m
Slider parallelism: ≤0.015 mm / 300 mm
Repeat positioning accuracy: ≤±0.003 mm
Stroke: 10–250 mm (programmable)
Speed: No‑load 20–120 SPM; full‑load 55–65 SPM
Motor: Direct servo drive (no belt loss)
Energy consumption: 0.72 kWh/h
Noise (full load): ≤72 dB
Precision standard: JIS Class 1 (ISO 9001 & CE certified)

Why STC Double Crank?

Wider bed & double crank → better balance, minimal deflection
Ideal for wide progressive dies and large single parts
More stable than single‑crank STA under eccentric load

3. Customized Solution for the Customer

Qiaosen delivered a full solution focused on precision, stability, and flexibility:

STC‑200sv main units (3 sets)
- 15.6” HMI, multilingual, 9 standard motion curves
- Electronic cam + soft limit + overload protection
Progressive die optimization
- Pendulum curve + slow forming at critical stations
- Reduced cracking on 2.0–3.0 mm 304 SS
Automation interface
- Connect to existing servo feeders & safety light curtains
Mold memory & fast setup
- 200 mold recipes stored; change time <20 min

4. Measured Results – Before vs After

After 10 months of mass production (2‑shift operation, 12 h/day):

Indicator	Mechanical Press (Old)	STC‑200sv (New)	Improvement
Defect rate	0.6–0.8%	≤0.02%	↓97%
Output per machine/day	9,200 pcs	14,500 pcs	↑57.6%
Mold life (progressive)	120,000 pcs	410,000 pcs	↑241%
Setup/change time	40–50 min	15–20 min	↓60%
Unit energy consumption	0.86 kWh/h	0.72 kWh/h	↓16.3%
Workshop noise	83 dB	71 dB	↓14.5%
Dimensional stability	±0.02~0.03 mm	±0.008~0.012 mm	Much better

5. Customer Feedback (Q&A)

Q: Why choose STC double crank instead of single crank?

A: Our progressive dies are 800–1,200 mm wide. Double crank gives better balance, less deflection, and consistent gap across the entire bed. Single‑crank machines showed obvious parallelism error on wide dies.

Q: How does servo curve help with stainless steel?

A: We use
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