Step-lap Transformer Core Cutting Line

Step-lap transformer core cutting line is an automatic cut to length line for silicon steel coil, it’s a necessary production equipment for transformer lamination manufacturing. It can cut 45 degree and 135 degree shear, transverse and longitudinal progressive shear, hole punching and v notching. The line can be suitable for cutting series shapes of work pieces used in the manufacturing of transformer industry. Our production line has high quality with high speed. All electric elements use international famous brand products. The line has high stable performance with high precision.

The Step Lap Core Cutting Machine is a fully automatic CRGO processing line designed to cut grain-oriented silicon steel coils into precision laminations for transformer core manufacturing. It integrates servo feeding, hole punching, V-notching, 45° and 135° shearing, conveying and automatic stacking into one continuous production process.

Available in HJX300, HJX400 and HJX600 models, the machine processes 0.23–0.35 mm CRGO silicon steel and supports strip widths up to 660 mm depending on the selected model. With servo-controlled feeding, the line achieves length accuracy of ±0.2 mm and cutting burr of ≤0.02 mm.

The Step Lap Core Cutting Machine is suitable for producing different transformer core legs and yoke laminations with programmed step-lap sequences, helping transformer manufacturers improve cutting consistency and reduce manual processing.

Components of the Core Cutting Line

● Double/ single head hydraulic decoiler

● Servo feeding system

● Servo V notching device

● Hole punching device

● 45° electric shearer

● 135° electric shearer

● Servo rail positioning device

● Belt conveyer

● Collecting conveyer with auto stacking

● Product stacking trolley

● Controlling system

Key Features of Step Lap Core Cutting Line

● Automatic Step-Lap Cutting
Servo feeding, punching and cutting functions support automated step-lap transformer core lamination production.

● ±0.2 mm Length Accuracy
The servo feeding system provides accurate positioning for consistent lamination dimensions during continuous production.

● Low Cutting Burr
Cutting burr can be controlled to ≤0.02 mm, supporting clean CRGO lamination edges.

● Integrated V-Notching and Hole Punching
The Step Lap Core Cutting Machine combines V-notching and punching operations with lamination cutting, reducing the need for separate processing equipment.

● 45° and 135° Shearing
Dedicated electric shearers produce different angular profiles required for transformer core legs and yokes.

● Automatic Conveying and Stacking
Finished laminations are transferred and collected automatically after cutting, helping reduce manual handling.

● Touch Screen Control
A 10.4-inch HMI allows operators to manage production parameters and different cutting programs.

Main specification

How Does the Step Lap Core Cutting Machine Work?

The complete transformer core lamination processing flow is:

CRGO Coil Loading → Decoiling → Servo Feeding → Hole Punching → V-Notching → 45° / 135° Cutting → Conveying → Automatic Collection and Stacking

After the CRGO coil is loaded onto the hydraulic decoiler, the servo feeding system delivers the silicon steel strip according to the programmed lamination length.

The Step Lap Core Cutting Machine then performs hole punching, V-notching and angular cutting according to the required transformer core design. Finished laminations are transferred to the collecting conveyor for subsequent stacking and core assembly.

This integrated process makes the equipment suitable for manufacturers requiring repeatable production of multiple transformer core lamination sizes.

What Can the Machine Produce?

The Step Lap Core Cutting Machine can be used to produce CRGO laminations such as:

● Transformer core legs
● Center limb laminations
● Top and bottom yokes
● Step-lap laminations
● V-notched laminations
● Laminations with punched holes
● 45° cut laminations
● 135° cut laminations

Different lamination dimensions and cutting sequences can be programmed according to the transformer core design.

Applications of Step-lap Transformer Core Cutting Line

The Step Lap Core Cutting Machine is designed for transformer manufacturers and transformer core processing facilities producing CRGO laminations for:

● Distribution transformers
● Power transformers
● Three-phase transformers
● Step-lap transformer cores
● Laminated CRGO transformer cores

It can work together with silicon steel slitting and transformer core stacking equipment to form a more complete transformer core production process.

Send us your CRGO specifications, transformer core size and lamination drawings to receive a suitable Transformer Core Cutting Line configuration and quotation.

Why Step-Lap Cutting Accuracy Matters

Step-lap transformer cores require accurate control of individual lamination length and joint position.

For this reason, a Step Lap Core Cutting Machine should maintain stable control over:

● Lamination length
● Step position
● Cutting angle
● V-notch position
● Hole position
● Cutting burr
● Feeding repeatability

Accurate servo feeding and controlled cutting help maintain consistent lamination geometry before transformer core stacking.