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I want to be clear about one thing: achievable straightness depends on your incoming raw material. On cold-drawn or ground bar, the press holds a tighter band than on hot-rolled stock. Below are the operating numbers I use when planning a new job. Setup time for a new section runs 30–45 minutes, including support position checks and loading the part model. Once saved, a recipe recalls in under 160 seconds.
*Value measured on precision cold-drawn bar or ground shaft with incoming straightness better than 0.1 mm per meter. Not a blanket guarantee for all materials.
I save each workpiece profile—section, length, support positions, target tolerance. The operator selects the job, and the press loads parameters automatically. New part setup typically takes 30–45 minutes; a stored recipe recalls in under 160 seconds. This removes the trial-and-error that used to eat the first hour of a shift.
The system measures deflection at three or more points along the part, not just at the center. Spring-back behaviour changes with material and section, so multi-point measurement reduces the number of correction loops needed. I have seen cycle counts drop by two or three loops on mixed batches.
The hydraulic cylinder applies controlled point pressure without sliding dies across the surface. I use this on finished shafts and plated parts because it avoids scratches and indentations. The press does not leave jaw marks, a common complaint on older mechanical straighteners.
| Parameter | Value |
|---|---|
| Rated force | 60 t / 100 t / 120 t / 150 t / 300 t / 800 t |
| Max straightening length | 2,500 mm standard; extendable to 6,000 mm |
| Measurement method | Multi-point laser or contact probe, online |
| Control system | PLC with touchscreen HMI; optional MES interface |
| Hydraulic system | Servo-driven pump, closed-loop pressure control |
| Cycle per point | 8–20 s, depends on part length and number of measurement points |
| Power supply | 380 V / 50 Hz, 3-phase; other voltages on request |
| Floor space | From 2.5 m × 1.5 m up to 8 m × 3 m, model-dependent |
Precision values listed in this table are best-case results on precision raw material. I do not quote a single tolerance for all incoming stock; the machine follows the straightness of the material you feed it. We calibrate the measurement system weekly and check hydraulic zero points every 2000 operating hours. Servo pump maintenance is standard—filter changes and fluid sampling, not a rebuild.
Job shops and heat treatment facilities see the most value here because they face mixed batches—different materials, sections, and straightness targets every day. A dedicated line machine sits idle too often. This press re-tools quickly and handles the variety without requiring a tooling change for each diameter. I have set it up for square tubes in the morning and short shafts in the afternoon, on the same machine.
If your incoming material varies from batch to batch, I will tell you straight whether this press can hold the tolerance you need, and what raw material condition is required. We run sample tests on your parts before you commit. Send a drawing, current straightness deviation, and the target tolerance. You get a test report with measured before and after data.
Shangda metal straightening press corrects bow, twist, and ovality in bars, tubes, profiles, and short shafts. I set the target tolerance on the touchscreen, the system measures actual deflection, and the hydraulic cylinder applies controlled point pressure. The final straightness depends on your incoming material—better input stock, better output. Setup is recipe-driven, so changing from one section to another takes less time than the old manual method. The control system records each correction point and can export data for your quality records.
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