MICRODEPO–ELETRO-SPARK DEPOSITION PROCESS

Kyodo International brings you a New Technology for maintenance and repair of molds & dies.

Overlay on Plastic Forming Mold

With the prime objective to save resource and energy for future generation, M/s TechnoCoat International developed a new technique for micro deposition of an alloy layer or carbide coating at low heat input for the repair or restoration of worn dies or molds used in the manufacturing of lightweight material components, such as of aluminum alloys or plastics.

General Principle of Deposition Process

 

MicroDepo is used for depositing consumable electrode made of alloys and intermetallic compounds on the work piece by means of electric sparks at frequency of 10^–1 to 10^–3 second for one to ten million for seconds per spark. Direct current from the power suppy will heat the electrode to 8,000 to 25,000°C only at the contact areas and transfers a small quantity of the electrode to the work piece under an ionized state and produces a strong metallurgical bond.

 

Advantages of MicroDepo :

Overlay on various materials

1. Extremely low heat input eliminates distortion, pits, shrinkage and internal stress.
2. Requires no pre and post heat treatment.
3. On-site repair work which requires no dismantling of large machine.
4. Provides excellent bonding by the formation of diffusion Layer.
5. Rotating consumable electrode gives high deposition efficiency and produces excellent coating.
6. Very smooth as coated surface is obtained with a vibrating applicator.
7. Finishing stock of the overlay can be kept to the minimum, reducing finishing time.
8. Repeated overlay possible over worn out coating.

Application:

OVERLAY

Overlay on Plastic Injection Mold	Grinding before and            after overlay

1. Restoration of washout in parting lines to eliminate flashes in the cast products of die-casting, plastic and rubber.
2. Filling undercut, pinholes and cracks in weld repair.
3. Repair of damaged or worn our surfaces around gates and cavities.
4. Altering gate location and/or letters on dies.
5. Repairing surface damage in guide-pins and ejector pins at the tip, bottom, and OD surfaces.

COATING

1. Coating on dies for preventing erosion, pickup, scuffing and heat checks

   Molten metal attack is reduced by an application of WTiC coating in erosion prone areas of new or used dies.
2. The coating along the parting lines improves gas release as well as product quality.
3. The coating on new of used dies minimizes heat checks.
4. Coating on pins prevents scoring/scuffing and improves release properties.
5. The coating provides uniform liquid flow and is very effective when applied on dies for thin gauge products.