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Process: Spark Erosion

Overview

Spark erosion (sinker electrical discharge machining, cavity type EDM, volume EDM) is an electronic process to cut metal pieces.

Spark erosion is performed in sinker electronic discharge machines, which has an electrode and a workpiece that are lowered in an insulating liquid. Both the electrode and the workpiece are connected to a power supply. The electrode is moved towards the component until a short circuit (or more correctly a dielectric breakdown) appears. Electricity is led from the electrode through the isolating liquid and the component, and the electricity cuts the workpiece. The electricity pulsing, which means the power is rapidly turned on and off. This is measure in on time, when the power creates sparks, and off time, the pause between every spark.

Using spark erosion, it is possible to manufacture complex shapes which are difficult to with conventional machines. It is also possible to get very fine tolerances in very hard materials. In addition, it is possible to machine small and sensitive workpieces, workpieces that any conventional machine would break because of its tool pressure.

Spark erosion is a quite rare manufacturing process, although found in some workshops. The electrical current usually determines the end result; a if it is high, the machining is quick and done rapidly but tolerances are less accurate. On the other hand, if the current is low, the machining process is slow but with fine tolerances.

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E.g., 17/06/2019
E.g., 17/06/2019
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Spark Erosion projects for quote

  1. Drawings count: 1

    Machining-Spark Erosion

    This client, a research institute currently working for the nuclear sector, seeks a supplier who can assist in the manufacture of the attached shear. The material required is of bespoke composition. As such, materials will be provided free-issue by the client.There is an immediate order to place for this one off requirement, with the potential for additional opportunities moving forward.

  2. Drawings count: 1

    Machining-Spark Erosion

    This company is looking for a reliable third party who can spark erode the attached components from free-issue material. There is an order to place for 2 off each component and similar work may be presented to the sucsessful supplier, once a relationship has been established. Reliability and quality are of utmost importance to this buyer.

  3. Drawings count: 2

    Machining-Spark Erosion

    This company specialises in the manufacture of fasteners. They are seeking the assistance of a third party to spark erode letters onto the end of a free-issue plunger. As well as having an immediate order to place, they have advised that the requirement will be ongoing and would like to collaborate with a vendor who can assist on a repeat basis. This is a new aspect to the design of the plunger, for which a supplier has not yet been allocated.

  4. Drawings count: 3

    Machining-Spark Erosion

    This £100,000-spending security construction company is looking for a supplier who can spark erode a logo onto free-issue aluminium panels. They would like to identify a supplier who can undertake regular orders on their behalf. The two listed sizes reflect both the largest panel and the most commonly ordered panel, although please be aware that this will vary. The frequency of the work may make it especially well-suited to those that are looking to supplement their long-term workload.

  5. Drawings count: 2

    Machining-Spark Erosion

    This company has an urgent order to place for modifications to be carried out on free-issue parts. Spark erosion is to be performed in accordance with the client's specification, in order to make the parts fit for end purpose within the aerospace industry. Suppliers that have the capacity available to undertake the work are asked to make contact with the buyer at their earliest opportunity, quoting their best price and lead time.

  6. Drawings count: 6

    Machining-Spark Erosion

    This is an opportunity to add a company to your customer base that spends £30,000 a year on bespoke machined components. A supplier with spark erosion capabilities is sought to produce the two attached holders in accordance with the drawings, as the buyer is looking to expand their supplier base for these items. The client is looking to partner with a supplier that can service this requirement on an ongoing basis, with substantial quantities of these parts ordered per year.

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