Transformer core “five-step seven-step” process refers to a series of key steps in the core manufacturing process, including material preparation, cutting, stacking, pressing, curing and subsequent inspection to ensure that the quality of the core meets the standard.
In the manufacturing process of transformer, iron core as its core component, its quality is directly related to the performance and life of the transformer. The “five steps seven steps” process is an important and indispensable part of the core manufacturing.
Below, we will have a detailed understanding of the specific content of this process.

A five-step process overview
1. Material preparation: first of all, the need to choose high-quality silicon steel sheet as the core material. Silicon steel sheet has good magnetic conductivity and low loss characteristics, is the ideal choice for manufacturing transformer core. In the preparation process, it is also necessary to carry out strict inspection of silicon steel sheet to ensure that it is free of defects and corrosion.

2. Cutting: According to the design requirements, the silicon steel sheet cut into the specified size and shape. Cutting process should keep the blade sharp to ensure that the cutting edge is flat and burr-free.

3. stacking: the cut silicon steel sheet according to a certain law stacked together to form the initial structure of the core. Stacking process should strictly control the gap and misalignment between the stacked pieces to ensure that the core of the tightness and uniformity.

4. compression: the use of special equipment for stacked iron core compression treatment, in order to improve its mechanical strength and electromagnetic properties. Pressing process to control the pressure size and uniformity, to avoid core deformation or damage. 5.

5. Curing: heating or chemical methods to make the core in the adhesive curing, so as to enhance the integrity and stability of the core. Curing process needs to control the temperature and time to ensure that the curing effect is optimal.

Second, seven-step process details (based on the refinement of the five-step)
On the basis of the five-step process, some manufacturers or process standards will be further refined into seven or more steps to better control the quality of the iron core. The following is a possible seven-step process elaboration:

1. Material pre-treatment: pre-treatment work such as cleaning, de-oiling, de-dusting, etc. is carried out on silicon steel sheets before cutting to improve cutting accuracy and stacking quality.

2. Precise cutting: adopt high-precision cutting equipment to accurately cut the silicon steel sheet to ensure that the cutting size and shape meets the design requirements.

3. Stacking Inspection: Each silicon steel sheet is carefully inspected before stacking, and defective sheets are eliminated to ensure the quality of stacking.

4. Orderly stacking: in accordance with the specified stacking order and method of stacking silicon steel sheets together to form a neat, tight core structure.

5. Preliminary compression: After stacking is completed, preliminary compression is carried out to fix the core structure and initially improve the mechanical strength. 6.

6. Fine Adjustment: Fine adjustment of the core after preliminary compression to ensure that the size and shape of each part meets the design requirements and to eliminate possible minor misalignments or gaps.

7. Final Curing and Inspection: After all adjustments have been made, final curing is performed and strict inspection procedures are used to ensure that the core quality meets standards. Inspection includes but is not limited to dimensional inspection, electromagnetic performance testing, appearance inspection, etc.

Through the above “five steps seven steps” process detailed analysis, we can see the complexity and rigor of the transformer core manufacturing process. Only in strict accordance with the process requirements for operation and inspection, in order to produce high-quality, high-performance transformer core.