Knowledge base
Articles and guides on transformer core cutting
Practical, engineering-level notes from a machine builder: how cut-to-length, slitting and stacking lines work, how to size them, and what the numbers on a datasheet really mean.
Company NewsCore Shop PlanningCore StackingCut-to-Length LinesProject CasesSlitting LinesTechnical Basics
Company NewsField Notes from India, Part 2: Slitting Trials, Operator Training and HandoverThe next chapter of our India installation: slitting trials, practical operator training and the service record signed on 7 October 2026. With photos and video from the site.Cut-to-Length LinesFactory and Site Acceptance for a Cut-to-Length Line: What to Check and HowAcceptance is where a line is judged against the contract. What a buyer should check at the factory acceptance test and again on site, how to measure length, angle and burr, and which records to keep.Technical BasicsCut-to-Length Line Maintenance: What Actually Needs Attention on the Shop FloorA maintenance checklist for transformer core cut-to-length lines built from our own service records rather than from a generic manual: the areas that generate most service calls, what goes wrong there, and what an operator can check in a few minutes a week.Company NewsInstalling Two Lines in Kazakhstan: Foundations, Oils and Grout Sourced LocallyIn spring 2026 our engineers installed a slitting line and a 400-class cut-to-length line for a transformer maker in Kazakhstan. Most of the work before commissioning was about things bought locally: foundations, oils and grout. Notes on how each was settled.Core Shop PlanningBefore the Engineers Arrive: What to Prepare for a Core Cutting Line InstallationMost installation delays are decided before the engineers arrive. This is the preparation list from our technical specifications for cut-to-length and slitting lines, with the reasons behind each item and four more points we recommend agreeing in writing.Company NewsSREE at EPOWER 2026 in ShanghaiEPOWER, China's international power equipment and transformer exhibition, ran from 3 to 5 June 2026 at the Shanghai New International Expo Centre. Photos from the SREE stand at our home show.Company NewsSREE at CWIEME Berlin 2026CWIEME Berlin, 19 to 21 May 2026 at Messe Berlin. Photos from our stand and the three requests we heard most: offline automatic stacking, wide slitting lines and special lamination shapes.Company NewsFrom Rugao to Morocco: Delivering a 300-Class Cut-to-Length LineA high-speed 300-class cut-to-length line left our works in December 2025 and was installed at a transformer plant in Morocco in May 2026. A short record of the steps between: factory test, container loading, installation and operator training.Company NewsField Notes from India: Installing a Silicon Steel Slitting Line, Part 1Our four-person commissioning team is in India this month to install and commission an SRZJ slitting line for a transformer core manufacturer. Part 1 covers the plan: registration, site preparation and the three weeks of work ahead.Company NewsSREE at Middle East Energy 2026, Dubai: What Transformer Makers Asked Us AboutThree days at Dubai World Trade Centre, stand Z2.G18: what we brought, who came to the stand, and the questions that came up again and again about slitting lines, thin steel and service.Cut-to-Length LinesPeak Speed vs Real Output: How to Estimate Laminations per Hour from a Cut-to-Length LineThe m/min figure on a datasheet is not a production rate. This article gives a simple method to turn strip speed, lamination length and steel thickness into pieces per hour and tonnes per month, with a worked example and the assumptions written out.Core StackingCut-and-Stack Lines: When Combining Cutting and Stacking in One Machine Makes SenseA cut-and-stack line cuts the laminations and builds the core in the same machine, so the pieces are never handled. Here is what that gains, what it costs in flexibility, and how it compares with a cutting line feeding a separate stacking line.Core Shop PlanningFrom Coil to Core: Planning a Transformer Core Shop LayoutA core shop is a flow, not a collection of machines. This article follows silicon steel from the master coil to the finished core, shows where the buffers and the handling belong, and explains which steps are worth automating and in what order.Technical BasicsProcessing Thin CRGO (0.18 to 0.23 mm): What Changes on a Cut-to-Length LineThinner grain-oriented steel lowers core loss but is harder to feed, cut and stack. This article covers what actually changes on the line when you move from 0.27 or 0.30 mm to 0.18 or 0.20 mm, and what to specify so the line copes.Technical BasicsStep-Lap Core Cutting: V-Notches, Yoke Widths and How Many Punch Stations You NeedStep-lap joints and V-notches are what make a cut-to-length line more than a shear. This article explains what the line has to do for a step-lap core and gives the rule we use to decide between one and two V-notch stations.Technical BasicsCutting Tolerances That Matter for Transformer Cores: Angle, Length and BurrThree numbers on a cut-to-length line datasheet decide how good the finished core will be. Here is what each one does to no-load loss, noise and stacking, what the figures should look like, and what to ask a supplier before you believe them.Cut-to-Length LinesStandard vs High-Speed Cut-to-Length Lines: When Does High Speed Pay Off?A high-speed line is not simply a standard line with a bigger motor. The strip never stops, the stations move with it, and changeovers are done by program. Here is what that buys you, and the tonnage rule we use to decide.Cut-to-Length LinesHow to Choose a Cut-to-Length Line Width Class (200 to 1000) for Your Transformer CoresThe width class is the first and most consequential decision when buying a cut-to-length line. Four questions settle it: the widest lamination you build, the holes you punch, the tonnage you run, and the floor you have.Slitting LinesSlitting Line vs Cut-to-Length Line: What Each One Does in a Transformer Core ShopBoth machines cut silicon steel, but in different directions and for different reasons. Here is what a slitting line and a cut-to-length line each do, when a core shop needs both, and how they connect on the floor.Technical BasicsWhat Is a Cut-to-Length Line for Transformer Cores? How a CTL Line Works, Station by StationA cut-to-length (CTL) line turns coils of grain-oriented silicon steel into finished core laminations. This guide walks through every station on the line, what each one does to the strip, and which numbers on a datasheet actually matter.Project CasesBeijing Create, Zhengzhou: Cutting, Stacking and Core LogisticsSREE supplied two SRHJ400-224G cut-to-length lines, an SRDZ-2200 stacking machine and core storage and transport systems for Beijing Create’s Zhengzhou factory.Project CasesHuali’s Uzbekistan Project: Two Cutting Lines and a Slitting LineSREE supplied SRHJ200-223G and SRHJ300-223G cut-to-length lines and an SRZJ-1250B slitting line for Huali’s transformer manufacturing project in Uzbekistan.
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