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What is the value of thickness of recast layer in electro discharge machining?

What is recast layer in EDM?

The recast layer is made up of moltenmetal particles that have been re-deposited onto the surface of the workpiece. Both the HAZ and recast layer could also contain micro-cracks that could cause stress failures of critical components.

What does recast layer mean?

A layer of resolidified material, or recast layer, commonly lines laser drilled holes. This is formed from the resolidification of molten material that was not ejected from the hole.

What is white layer in EDM?

The thermal material removal principle in Wire-EDM creates a characteristic rim zone alteration. The process generates especially an outer shell that is known as white layer. Although this layer is generally reducing the mechanical endurance, the precise structure and composition of this layer is unknown.

What is recast metal?

Recasting metal can be done in multiple ways. It is often done as part of a welding construction or assembly, but recasting an autonomous product into a half-finished product or finished product is also possible.

image-What is the value of thickness of recast layer in electro discharge machining?
image-What is the value of thickness of recast layer in electro discharge machining?
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How do I remove a recast layer?

The recast layer on the sidewall surface can be electrolytically removed by using the side of the electrode. The removal depth of the recast layer on the sidewall surface is 10–20 μm and the surface roughness Ra is less than 0.5 μm when the feed rate is 2–3 μm/s.May 24, 2020

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What is heat affected zone in EDM?

Whereas EDM is able to machine any material above a minimal electrical conductivity, though with a certain degree of tool wear and heat influence, PECM has difficulties machining materials that build a passive layer or have chemically indissoluble contents. However, PECM has the advantage of working nearly wear-free.

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What is EDM machine used for?

EDM is a thermal process for removing unwanted material by applying cycled discharging sparks in the gap between an electrode and a conductive workpiece. This method is typically used for machining refractory metals and hard materials, which are difficult to machine with conventional machining techniques.

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What is used as dielectric medium in EDM?

Quite often kerosene based oil is used as dielectric in EDM. The dielectric fluid is circulated through the tool at a pressure of 0.35 N/m2 or less to free it from eroded metal particles, it is circulated through a filter.

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What are the value of temperature that are obtained while machining using EDM?

What are the values of temperature that are obtained while machining using EDM? Explanation: The temperatures obtained when the ions reach their respective electrodes, range between 8000ᵒC and 12000ᵒC. 8.

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Which is softer material in USM?

Which is softer material in USM? Explanation: Tool is softer than work piece in USM.

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What is recasting in ESL?

A recast is a technique used in language teaching to correct learners' errors in such a way that communication is not obstructed. To recast an error, an interlocutor will repeat the error back to the learner in a corrected form.

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Is recast past tense?

Word forms: recasts, recastinglanguage note: The form recast is used in the present tense and is the past tense and past participle.

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Why does EDM have such a fine finish?

  • This fine finish is present, even after very large parts are cut, as in Figure 5:2. In other cutting operations, such as lasers and abrasive water jet, the larger the part, the rougher the finish. Wire EDM produces a smooth finish because the wire electrode goes through the entire part, and spark erosion occurs along the entire wire electrode.

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How does Your EDM machine work?

  • Your EDM Machine facilitates controlled sparking for regulated erosion of material from the work-piece surface; the electrode and the work-piece are submerged in a dielectric fluid and precisely controlled cyclic recurring spark discharges are initiated between the electrode and the work-piece.

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What is the difference between wire EDM and other cutting operations?

  • In other cutting operations, such as lasers and abrasive water jet, the larger the part, the rougher the finish. Wire EDM produces a smooth finish because the wire electrode goes through the entire part, and spark erosion occurs along the entire wire electrode.

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What is the size of the EDM showpiece?

  • Figure 5:2 Showpiece: 16 Inches (406 mm) Tall—Cut at Reliable EDM (Reliable Can Wire EDM Parts Up to 64" (1626 mm) Tall) Figure 5:3

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