333 results about "Electrodischarge machining" patented technology

The invention relates to a wire (1) which comprises a copper or pinchbeck core (2) surrounded by a pinchbeck coating consisting of a continuous pinchbeck sub-layer (3) in phase β and a superficial layer (4) with a fractured pinchbeck structure in phase ? enabling the appearance of pinchbeck in phase β in the fractures (5a). In this way, the electrical discharge machining speed is essentially increased.

A method for electrical discharge machining a workpiece includes the steps of: presenting an elongate electrode to the workpiece with a spark gap therebetween; flowing a dielectric fluid in the gap; eroding the workpiece by electrical discharge between the tip of the electrode and the workpiece; displacing the electrode in a direction aligned with the long axis of the electrode to maintain the gap as the electrode wears and the workpiece is eroded; and simultaneously with the displacement, producing vibratory movement of the electrode, the vibratory movement being aligned with the long axis of the electrode.

A machining program creating device for a wire electric discharge machine creates a machining program for machining a keyway on the side surface of a round hole in a workpiece, based on a previously specified diameter of the round hole, a center position of the round hole measured by bringing a wire electrode into contact with the workpiece, and a previously defined shape of the keyway.

An object is to enable highly accurate machining by correcting machining conditions by referring to a programmed trajectory to obtain a desired machining shape. A wire electric discharge machining apparatus includes a machining-condition correcting unit that corrects machining conditions in each machining stage corresponding to a circular arc radius of a portion corresponding to a corner portion of a programmed trajectory, in the corner portion formed by changing a direction of relatively moving a wire electrode, when the wire electrode is moved on a wire center trajectory, which is offset from the programmed trajectory prestored in order to obtain a desired machining shape to perform finish machining in each machining stage with an offset amount being changed.

The invention discloses an electric spark milling and mechanical grinding combined machining device. The combined machining device comprises a servo system (1), a milling machine chuck (2) connected with the servo system (1), a combined machining cutter (3) connected with the milling machine chuck (2), a rotary table (4) installed under the combined machining cutter (3) and a pulsed power supply (5) connected with the combined machining cutter (3). According to the combined machining device, discharge electrodes and material grinding rods are mounted on an electrode plate, mechanical grinding is carried out while electric discharge machining is conducted, no short out phenomena or arc discharge phenomena exist, electrode losses are even, quality of machining surfaces is good, compensation is easily achieved, machining efficiency is quite high, precision is high, the mirror surface effect can be achieved through machining, swarf removal is facilitated, and the combined machining device can be widely applied to machining insulators, semiconductors and other workpieces.

The invention discloses an ultrasonic-vibration-assisted discharging and grinding device. The ultrasonic-vibration-assisted discharging and grinding device comprises an ultra-precision grinding machine, a pulse power supply, a pulse discharging parameter collection system, an ultrasonic vibration assistance device and a data processing and regulation system. The ultra-precision grinding machine is provided with a diamond abrasive wheel. The ultrasonic vibration assistance device is fixed to a working table of the ultra-precision grinding machine and used for installing a workpiece and making the workpiece vibrate in the axial direction. The data processing and regulating system is sued for analyzing vibration parameters of the ultrasonic vibration assistance device and obtaining pulse discharging parameters and grinding parameters in real time. The discharging parameters of the pulse power supply, the grinding parameters of the grinding machine and the vibration parameters of the ultrasonic vibration assistance device are regulated in a self-adaption manner through a grinding machine CNC system of the ultra-precision grinding machine so that ultrasonic-vibration-assisted discharging and grinding can be achieved. The invention further provides an ultrasonic-vibration-assisted discharging and grinding method. The gap between grinding particles of the abrasive wheel and the workpiece is regulated through axial ultrasonic vibration, and therefore spark discharging can be uniform, the phenomenon of intermittent discharging is reduced, discharging machining is improved, and the workpiece machining quality can be better.

An electric discharge machine to process a work piece includes a plurality of electrodes, and a plurality of discharge power supply units. The plurality of electrodes generate a plurality of discharges with the work piece, respectively. The plurality of discharge power supply units apply voltages for the plurality of electrodes, respectively and independently.

The invention relates to an electric spark milling method by mist, which pertains to special process technology domain. The invention takes mist as dielectric medium between work piece and instrument to make electrodischarge machining. Compared with gas and liquid medium, mist medium has a lower breakdown voltage and can reduce the cost of liquid, and with rotatable instrument pole it can accelerate decorporation of elaboration product. The invention has a fast process velocity and can produce product with good surface quality.

Provided is a field jet flow micro electrical discharge machining method of the micro-nano non-traditional machining field. The positive electrode and the negative electrode of a high direct voltage power supply are respectively connected with a machining workpiece and a jet mechanism, and direct voltage is applied, and a high voltage electric field is formed between the machining workpiece and the nozzle of the jet mechanism. Through the adjustment of the distance between the machining workpiece and the nozzle, an electrified liquid drop at the exit end of the jet mechanism is enabled to form Taylor cone and generate intermittent field jet flow at the tip end of the cone, further the gas medium between the jet flow tip end and the workpiece is punctured by the high voltage electric field and electric discharging and heat are generated, and therefore micro corrosion removing processing is achieved. The field jet flow micro electrical discharge machining method can achieve micro electric discharging corrosion removing processing of micron order and even smaller size, a micro electrode is free from being manufactured on line, and after the field jet flow breaks down in an electric discharging process, the field jet flow can be dynamically generated in next cycle, the process circulates repeatedly, the problem of the inherent electrode wear compensation of a normal electrical discharge machining does not exist.

The wire electric discharge machine determines whether machining is submerged machining or flushing machining. If the machining is the submerged machining, when a fluid level of working fluid is lower than a predetermined height, the wire electric discharge machine prohibits a machining power from being applied. Thus, it is possible to prohibit the machining power from applied in a state in which the working fluid is insufficient and the submerged machining cannot be appropriately performed, thereby preventing an electric shock due to contact with a wire electrode and machining parts of a workpiece and preventing the working fluid from scattering to the air, and improving safety.

An electric discharge machining process, an article for electric discharge machining, and an electrically-conductive electric discharge machining coolant are disclosed. The electric discharge machining process includes electric discharge machining a target region of a component. The article includes a non-electrically-conductive layer, an electrically-conductive layer, and a target region on the non-electrically-conductive layer. The electrically-conductive electric discharge machining coolant includes a hydrocarbon liquid and carbon powder suspended within the hydrocarbon liquid.

Embodiments are directed to forming three-dimensional millimeter scale or micro-scale structures from single or multiple sheets or layers of material via electro discharge machining (EDM). In some embodiments, the electrodes are formed by single layer or multi-layer, single material or multi-material deposition processes. In some embodiments single electrodes form a plurality of parts or structures simultaneously. In some embodiments a sacrificial bridging material is used to hold parts together during and after EDM processing.

A wire electric discharge machine has a function for controlling the machining liquid temperature. When it is predicted that the machining liquid temperature rises linearly, the machining liquid begins to be warmed at time t_5b to reach machining liquid control temperature T₂ at human operation beginning time t₂. If the temperature rise at predetermined later time t₈ is greater than predicted, temperature rising suspended from time t₈ to a later time t₉. Temperature rising resumed at time t₉. This allows the machining liquid temperature to reach the machining liquid control temperature T₂ without wasting electric power.

The invention discloses a method and a device for controlling a discharging power supply, and provides a novel method and a novel device for controlling the discharging power supply. The device consists of a bipolar ignition detection module, a discharging module and a micro control unit; the micro control unit is used for controlling an ignition direction and determining a gap state; the presentinterpolar state is detected and an electrolytic phenomenon is eliminated by a bipolar ignition detection discharging method; and in a state suitable for discharging, a discharging and cutting process is performed so as to realize homenergic discharging machining control. In the control method provided by the invention, an ignition detection program is controlled that positive operation can be reused after one or a plurality of negative ignition discharging periods if one positive ignition discharging period is finished; and an average voltage tends to zero. By the invention, the microwire machining efficiency is improved, and electrode loss is reduced; benefits of increasing the machining speed and reducing the used consumable can be achieved; and the linear cutting and discharging machining equipment manufacturing industry in China steps into the fine machining field.

An electric discharge unit of an electric discharge machine is disposed in a working tank, and a working fluid in the working tank is delivered to a filter tank by a pump. A filter for working fluid filtration wound off from a roll faces apertures in the bottom of the filter tank. When the internal pressure of the filter tank exceeds a predetermined value, the filter is moved a predetermined distance downward of the filter tank. In a position off the filter tank, that part of the filter which has been used for filtration is cleaned.