By Halcyon Machinery · Updated
Forming speed describes strip movement; useful output is the number of acceptable finished parts produced during a defined period. For a purlin line, punching, cutting, size changes and unloading must be included in the production calculation. Use the actual job mix rather than a generic daily-output claim.
A worked calculation with explicit assumptions
Illustrative example only: assume a line moves strip at 12 metres per minute for 300 actual feeding minutes and makes 6-metre parts. It processes 3,600 metres, equivalent to 600 parts before allowing for end waste or rejected pieces. If 12 of those parts fail inspection, accepted output is 588 parts. These numbers are arithmetic assumptions, not Halcyon machine ratings. For a stop-to-punch process, record non-feeding time separately; if your measured cycle time already includes punching and cutting, do not subtract those stops a second time.
Buyer review worksheet
| Review item | Information to compare | Decision or evidence |
|---|---|---|
| Shift time | Total scheduled minutes | Include the same start and end points in every trial |
| Feeding time | Minutes when material advances | Separate from stopped time |
| Cycle constraints | Punching, cutting and unloading | Record with the representative hole schedule |
| Changeovers | Last good part to next good part | Include adjustment and first-piece inspection |
| Quality loss | Rejected parts and scrap | Count accepted output separately |
How should a supplier demonstrate output?
Request a timed run using your grade, thickness, length and hole pattern. Record accepted pieces, stops, coil changes and operator involvement. Compare that result with your required order mix; an unloaded maximum speed alone does not establish shift capacity.
Why can a 30 m/min purlin line produce less when punching holes?
Forming reference speed and accepted finished-part output are different measurements. Punching frequency, hole spacing, cutting and handling affect the cycle. The 30 m/min high-speed figure shown for HCZ-S20-300 is a forming reference, not a punched-output rating. A separate HCZ-300L technical sheet gives a 12–18 m/min range depending on punching quantity; that range must not be assigned to HCZ-S20-300. Verify the proposed line in a timed trial using the buyer's steel grade, thickness, hole schedule and cut length, and count accepted parts.
Apply the answer to your order
Illustrative comparison: run two jobs with the same section and length, one with fewer holes and one with more processing operations. Record each trial from the same start point to the same finish point. Count accepted parts as well as elapsed time; a short clip of continuous feeding does not establish completed output.
Evidence to request
- Material and hole schedule attached to each timed trial.
- Accepted pieces, elapsed minutes and rejected pieces recorded separately.
- Confirmation of whether quoted speed includes punching, cutting and unloading.
Supporting reference: HCZ-S20 reference speeds and their qualification. This reference provides context; order-specific performance and scope still require written confirmation.
Download the editable buyer worksheet (.txt) · Link to this answer
Record a comparable production trial
Use the same profile, steel grade, thickness, hole pattern and cut length for each comparison. Record the observation period and whether it includes setup, coil changes or planned stops. A steady-running sample is not a complete shift result.
Download the blank output-trial worksheet (CSV). This is a planning template, not a completed inspection report or a machine-performance guarantee.
For space and handling constraints, see purlin factory layout planning.
Prepare the next technical discussion
Send the completed trial assumptions with your latest section drawing and production requirement. See the roll forming machine quotation checklist for the complete inquiry package.
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