36results about How to "Reduce discharge energy" patented technology

The invention discloses a two-stage limited pulse width precision electrical discharge pulse power source. In the invention, an adjustable stabilized voltage source E1 is electrically connected with acurrent-limiting resistance array R1-Rn, a forestage FET Q1 and a discharge electrode anode P+ in sequence; a backward stage FET Q2 is electrically connected with the forestage FET Q1 in series, andis electrically connected with plus-minus discharge electrodes P+ and P- in parallel; the two FETs are inverting driven by high frequency and output rising edge and failing edge of the discharge pulserespectively to realize two-stage limited pulse width and limit the min output pulse width at 60ns, thus outputting microenergy discharge pulse.

The invention discloses a partition electromagnetic compound forming method and device of a large integral panel. The method comprises the steps that S1, a board is subjected to roll bending preforming; S2, a forming mold is set, and the board is placed on the forming mold; S3, the board and the forming mold are clamped; S4, the board is provided with multiple to-deforming areas; S5, electromagnetic force is exerted to the to-deforming areas in batches from the board clamping area to the side direction, the board is extruded towards the forming mold until all the to-deforming areas are formed,and when each to-deforming area is formed, the area and the forming mold are clamped; and S6, under the condition that the board does not spring back, clamping force is unloaded. The device comprisesa roll bending set, the forming mold and a pressing block; the board is subjected to roll bending preforming on the roll bending set and then is placed on the forming mold and is clamped through thepressing block, and multiple thrust coils used for exerting electromagnetic force to the board in batches are arranged above the board. The device has the advantages of being easy and convenient to operate, high in forming precision, and capable of prolonging the part service life.

The present invention relates to an electric discharge machining apparatus. A voltage measurement circuit (4) is connected between an electrode and a workpiece by a parallel cable through a resistor (R) to measure a machining gap voltage. The parallel cable, like a television antenna feeder line, is formed such that two conductive wires are parallel fixed by an insulating and flexible material such as rubber or resin with a predetermined distance. The interline distance of the parallel cable is increased to decrease a stray capacitance of the cable, so that a high-frequency voltage in finish machining can be measured by the voltage measurement circuit without being attenuated. The resistor (R) is connected to suppress oscillation of a voltage input to the voltage measurement circuit.

The invention discloses a method and a device for improving the performance of an intrinsic safety switching power supply in an explosive dangerous environment. By adoption of the method for detecting the change rate of a current by an inductor, a main circuit is cut off; the time of the current change during short circuit is delayed by the inductor to make the current start rising after a voltage is reduced to zero, so discharging energy during the occurrence of a fault is reduced; and the change rate of the current during the short circuit is controlled by the inductor, so the influence of electromagnetic interference (EMI) is reduced. A current differential measurer of the device is connected with an input end of a driving circuit; an output end of the driving circuit is connected with control ends of switches; the first switch is connected in series with a current-limiting inductor; the second switch is grounded by a load resistor (RL); the current-limiting inductor is connected in parallel with a diode; and the current-limiting inductor and the diode which are connected in parallel are grounded by the RL. The invention has the advantages that: the power of the intrinsic safety switching power supply is improved; the safety and reliability of an intrinsic safety system are improved; the change rate of the current is reduced; and the EMI is reduced.

The invention discloses a pulse power supply energy transmission circuit in reciprocating wire EDM wire cutting, comprising a pulse power supply, an upper conductive block, a lower conductive block, an electrode wire, a workpiece and a host computer. The negative electrode of the pulse power supply is connected to the upper conductive block. A first relay is added between the blocks, a second relay is added between the negative electrode of the pulse power supply and the lower conductive block, the upper conductive block and the lower conductive block are respectively connected to the electrode wire, the positive electrode of the pulse power supply is directly connected to the workpiece, and the host computer By controlling the first relay and the second relay, the upper conductive block, the lower conductive block and the corresponding electrode wire are added to the circuit alternately. The invention solves the problems of equalizing the energy of the discharge points on the surface of the workpiece, equalizing the material removal amount, and the like, and relieves the problem of the waist drum degree error in the middle part.

The invention discloses a low-ozone device of an electrostatic air purifier. The low-ozone device comprises a capacitive isolator, an electrostatic adsorption structure, a tungsten filament, an electric field upper cover, an electric field lower cover and an electrode plate pressing strip. The low-ozone device of the electrostatic air purifier has the beneficial effects that the distance between terminals for fixing the tungsten filament is 124-135mm; optimal fixing points of the tungsten filament of an electrode are polarized through an electrostatic field, so that the resonance effect of the tungsten filament is greatly weakened, reduction of the charge energy of particles entering the electrostatic field is promoted, and generation of ozone is effectively reduced; the distance between a negative plate of the electric field and the tungsten filament is 6mm, and the one-time purification effect is optimal; the width of the negative plate of the electric field is 80.1-80.2mm, the width of a positive plate of the electric field is 58.7-58.8mm. Compared with the conventional negative plate of the electric field, the positive plate of the electric field and the negative plate of the electric field are widened by 30 percent, equivalent particles are removed, and the positive plate of the electric field and the negative plate of the electric field are shortened by 45 percent, so that the amount of the ozone generated by removal of the equivalent particles is obviously decreased.

A mining isolated type intrinsic safety LED driving power source comprises an input rectification filter circuit, an isolation transformer, an output filter circuit, a feedback sampling and switch tube controlling circuit and a switch tube crest voltage suppression circuit. The output side of the input rectification filter circuit is connected with the isolation transformer, the output side of the isolation transformer is connected with the output filter circuit and the feedback sampling and switch tube controlling circuit respectively, the switch tube crest voltage suppression circuit is connected with the output side of the feedback sampling and switch tube controlling circuit, the output side of the switch tube crest voltage suppression circuit is connected to the input side of the isolation transformer, and the output side of the output filter circuit is connected with an LED load. The mining isolation type intrinsic safety LED driving power source is characterized in that a passive PFC circuit is additionally arranged between the input rectification filter circuit and the isolation transformer, and a dual-output overvoltage and overcurrent protection circuit is additionally arranged between the output filter circuit and the LED load.

The invention is suitable for fine precision machining of insulated hard and brittle materials, belongs to the non-traditional machining field in manufacturing technologies, and particularly provides a pneumatic compression electrochemical discharge machining device and method. An airtight working cavity is filled with helium through a gas supply system, and thus pressure inside the working cavity is increased and controlled. An air pressure feedback and gas supply system is established to regulate the pressure inside the working cavity. A force feedback and tool electrode movement system is established to control effective feeding of tool electrodes, and the machining clearance is guaranteed. Pressure increase can accelerate formation of a gas film layer and improve the stability of the gas film layer, and electro-discharge machining precision and surface machining quality are improved. Pressure increase can also make operating fluid permeate into the machining area more easily, so that the machining depth is increased. Pressure control can indirectly control thickness of the gas film layer, and therefore the electro-discharge machining radius and machining precision can be controlled.

The invention provides a method and a device for realizing powder pressing through a radial electrometric force and an axial electromagnetic force. Powder is pressed simultaneously or in a staged modethrough the radial electromagnetic force and the axial electromagnetic force, the radial electromagnetic force is realized by adopting a solenoid coil, a pulse current is fed into the solenoid coil,a pulse large current and a pulse electromagnetic force are generated on metal powder in an induction mode, sintering is realized through the heat effect generated by the pulse large current, and themagnitude of the pulse electromagnetic force is changed, so that the metal powder can alternately generate elastic deformation and elastic recovery, oxide between the powder is broken, the friction force is reduced, and finally the compaction density is improved. The pulse large current can generate a thermal effect, so that the metal powder and the oxide are melted, the sintering is realized, andthe density of a pressed part is further improved.

The invention discloses a stretch-electromagnetic composite forming device and method for multi-curvature skin parts, including a bottom plate, a mold and an electromagnetic coil for forming a sheet on the mold, and the mold is installed on the bottom plate Above, the electromagnetic coil is arranged above the mold, and it is characterized in that it also includes a vertical oil cylinder, a tangential oil cylinder, and a chuck for clamping the edge of the sheet material, and is used for tangentially stretching the sheet material One end of the tangential oil cylinder is hinged to the bottom plate, and the other end is hinged to the chuck. One end of the vertical oil cylinder for vertically stretching the sheet is hinged to the bottom plate, and the other end is hinged to the chuck. hinged. The present invention adopts the composite process of stretching + discharge, and stretching has overcome a certain springback problem, and then eliminates the remaining springback through electromagnetic force, so that the thinning of the sheet can meet the design requirements, and at the same time can greatly reduce the impact on the Electromagnetic forming energy requirements.