TRANFOVIA(NINGBO) EQUIPMENT TECHNOLOGY CO.,LTD
TRANFOVIA(NINGBO) EQUIPMENT TECHNOLOGY CO.,LTD
The Dove-Tail Spacer Milling Machine is designed for precision milling of transformer insulation strips, especially dove-tail strips used in transformer winding structures and cooling duct systems. It processes pressboard strips into accurate dove-tail, straight-slot, and swallow-tail profiles, helping transformer manufacturers improve dimensional consistency, insulation reliability, and production efficiency.
Compared with traditional punching or manual milling methods, this machine completes profile milling, slot machining, and edge forming in one processing cycle. The finished strips have smooth surfaces, accurate slot depth, stable dimensions, and reduced burrs, which helps minimize additional polishing work and improve assembly efficiency in transformer coil production.
This equipment is especially suitable for oil-immersed transformers, power transformers, high-voltage transformers, and large transformer insulation structures above 110kV.
The Dove-Tail Spacer Milling Machine is mainly used in transformer insulation parts workshops and transformer manufacturing plants for producing precision pressboard strips.
Typical applications include:
The machine mills dove-tail slots, straight slots, and swallow-tail slots with stable accuracy. It helps ensure the center of the spacer groove and the center of the strips remain aligned during machining.
It is engineered for pressboard insulation strips used in transformer winding and cooling duct systems. The processed strips can be used in transformer coil insulation structures where mechanical support and oil flow channels are required.
The equipment can complete profile milling and slot machining in one processing cycle. This improves production efficiency and reduces repeated handling compared with traditional manual processing.
After machining, the strips are smooth and flat, with reduced burrs and lower risk of carbonization. This helps improve insulation quality and reduces secondary polishing work.
During machining, the strips are pressed and compacted tightly in both longitudinal and lateral directions. The strips remain vertical and are not tilted during loading and milling, ensuring stable machining accuracy.
The machine is suitable for processing large transformer insulation strips used in transformers above 110kV, supporting high-precision insulation parts production.
Both full automatic and semi automatic models are available, allowing transformer manufacturers to choose according to production volume, workshop layout, labor cost, and automation requirements.
| Item | Technical Parameter |
| Processing material | Transformer pressboard strips |
| Spacer length | 25–300 mm |
| Spacer width | 25–60 mm |
| Spacer thickness range | Max. 350 mm, customizable |
| Spacer length accuracy | ±0.2 mm |
| Slot machining accuracy | ±0.2 mm |
| Slot types | Swallow-tail slot, dove-tail slot, straight slot |
| Machining structure | Vertical holding and stable clamping |
| Main motor installed capacity | 29.3 kW, excluding dust collector motor |
| Pneumatic system pressure | 0.6 MPa |
| Pneumatic system flow | 100 L/min |
| Item | Technical Parameter |
| Pressboard width | 20–60 mm, adjustable |
| Pressboard length | 30–200 mm |
| System total power | 18.4 kW, excluding dust collector |
| Air supply pressure | 0.5 MPa |
| Feeding speed | 1–3 m/min |
| Max. clamping thickness once | 340 mm |
| Spacer thickness | 1.0–10.0 mm |
| Max. machining speed | 260 pcs/min |
| Length accuracy after machining | ≤ ±0.2 mm |
| Surface quality | Smooth, flat, non-carbonized, clean surface |
A Dove-Tail Spacer Milling Machine is used to mill transformer pressboard strips into dove-tail, straight-slot, and swallow-tail profiles. These strips are used in transformer winding insulation and cooling duct structures.
This machine is mainly used for milling. Punching is a different process. Milling removes material with a cutting tool to form accurate slots and profiles, while punching uses a die to press or cut shapes.
It is mainly used for transformer pressboard strips and insulation pressboard strips. The processed strips are used in transformer insulation systems.
Yes. The machine can process insulation strips used together with pressboard to form cooling duct structures in transformer windings.
The full automatic model is suitable for higher production volume and more consistent batch processing. The semi automatic model is suitable for flexible production, smaller batches, and workshops with lower automation requirements.
