PURPOSE:To prevent the convergence electric discharge and stabilize electric discharge machining by installing a working electric power scurce for applying electric conduction into an electric discharge gap from two dieferent positions on an electrode through selecting the working pulses and improving the dispersiok performance at the electric discharge points which is generated in the electric discharge gap and permitting the easy transfer of the electric discharge points CONSTITUTION:In a voltage source 3, the pulse condensers 5A and 5B are charged through switches 4A and 4B, and electric conduction is applied into the electric discharge gap between a workpiece 1 and an electrode 2 from two different positions A and B on an electrode 2 by the turning-on/off of the switches 6A and 6B, selecting the working pulses Therefore, the dispersion performance of the electric discharge points generated in the electric discharge gap can be improved Further, the electric discharge current by the pulses alternately supplied into the electric discharge points A and B is detected by each detection coil 8A, 8B, and the both detection signals are compared in a comparison circuit 9, and the generation of the convergence electric discharge in the electric discharge gap is detected When the generation of the convergence electric discharge is detected, a control circuit 10 is automatically controlled by the convergence electric discharge detection signal, and the speedy preventive control for the convergence electric discharge is executed, and the stable precision working is carried out

Electric discharge machine

A shift of an input coordinate by a change in temperature in a coordinate input device is prevented. An arithmetic operation and control circuit 1 applies a drive signal to a vibration pen 3 and starts a timer. The drive signal applied to the vibration pen 3 is delayed by a delay circuit 12, which drives a vibrator drive circuit 2 to generate vibration. A delay time of the delay circuit 12 is shortened as a temperature rises and a sum time of the delay generated by the delay circuit 12 and a delay generated in the vibration pen 3 as the temperature changes is constant regardless of the temperature. As a result, a vibration propagation time measured by the timer represents a net propagation time plus a constant delay time regardless of the temperature. Thus, the stable coordinate input is assured regardless of the temperature.

Coordinate input device

PURPOSE: To prevent an increase of electrode consumption and any roughness of surface quality on a machining surface from occurring, by turning a discharge current pulse to OFF at once as long as the specified period when detecting an electric short and a momentary cut between an electrode an a workpieces, and making a discharge current value so as to be gradually increased simultaneously with the elapse of an on-period of the discharge current pulse. CONSTITUTION: The discharge current detecting signal detected by a current detecting resistor RS is compared with the reference value, preset so as to cause a discharge current to be gradually increased, forming a control signal which control a transistor T. In consequence, as for a discharge current pulse, the current value is gradually increased as desired. And, if time from that point of starting the discharge current pulse and size of the current value at that time are selected, electrode consumption is always kept in the constant value and in no case increased even if the discharge current pulse is turned off at any point of time in the midway. Therefore, when a momentary cut and a short are detected and thereby the discharge current pulse is turned to OFF at once, such a fear that the electrode consumption is increased and the quality of a machining surface is roughed is brought to nothing even if it is any point of time in the discharge current pulse. COPYRIGHT: (C)1988,JPO&Japio

A wire electric discharge machine and a wire electric discharge machining method in which a workpiece set posture is compensated for an error. After a workpiece is set and fixed on a workpiece table, an upper guide measures three or more three-dimensional positions that are not situated on one straight line on an upper surface of the workpiece, utilizing detection of contact with the upper surface. A unit normal vector Nincl (Xn, Yn, Zn) is obtained, and a shift amount Δshif (ΔU, ΔV) for shift from an originally set vertical position (U0, V0) to a corrected position (Uc, Vc) is calculated. In machining, the shift amount Δshif (ΔU, ΔV) is added to the position (U0, V0) to compensate for an angle error of a machined surface, and a deviation of a machined point position caused by inclination of the workpiece is collaterally compensated for as required by correcting the upper and lower wire guides. Thus, the machined shape cannot be distorted, and the workpiece set posture error can be compensated for.

Wire electric discharge machine and wire electric discharge machining method

A cooking device include an outer housing and a cooking cavity disposed within and separate from the outer housing. The cooking cavity accommodates a volume of cooking liquid therein. The device includes a heater positioned adjacent the cooking cavity to heat the cooking liquid. A lid is movably attached to the device and is used to form a seal with the cooking cavity. The lid includes a transparent portion positioned along a top surface to enable viewing inside of the cooking cavity. A controller can be used to heat the cooking fluid for an amount of time designated by user input. A moving mechanism can be used to move a food article into and out of the cooking liquid. The moving mechanism can be automated. The device can include a drainage system for removing the cooking liquid.

Cooking device to deep fat fry foods

PURPOSE:To attain accurately machining tilt surfaces of a workpiece with its upper/lower surfaces not in a similar figure and a workpiece with the axis of the upper/lower surfaces not vertical even with the upper/lower surfaces in a similar figure by correspondingly providing upper/lower guide positions from a commanded finish machining shape, and providing a control device for correcting a wire tilt angle between both the positions. CONSTITUTION:A control device 6 reads a finish machining shape commanded by a machining program from an NC tape 11 in an NC program anlytic part 12, to obtain a machining route for actually moving a wire 1. Next in a moving position arithmetic part 13, positions of upper/lower guides 2, 3 are correspondingly obtained. In an interpolation processing part 14 from positions of these upper/lower guides 2, 3, a tilt angle of the wire 1 is calculated. Thereafter based on the predetermined correction amount, the tilt angle of this wire 1 is corrected in a tapered angle correcting part 15.

Wire electric discharge machine

PURPOSE:To heighten the speed of machining and shorten the time thereof, by controlling an electric discharge machining machine on the basis of actually instructed machining conditions calculated from machining conditions before input, inputted machining conditions, a machined state and data from machining liquid state sensors. CONSTITUTION:When optional machining conditions are instructed by an instruction unit 2, a central processing unit 1 takes out optional machining conditions from a registration circuit 3 and sends out the conditions to another central processing unit 12, which calculates actually instructed machining conditions from the optional machining conditions, machining conditions before input, and data from sensors 4, 5, and sends out the actually instructed machining conditions to the power supply circuit 6, servo circuit 7 and liquid pressure control circuit 8 of an electric discharge machining device to regulate the circuits on the basis of the actually-instructed machining conditions to control the speed of a motor 9, the energy of discharge, a machining gap, the pressure of a machining liquid, etc. Since the data from the sensors 4, 5 change along with the progress in the electric discharge machining of a workpiece 11, the actually instructed machining conditions are altered to be always optimal to heighten the speed of the machining.

Machining condition controller for electric discharge machining device

PROBLEM TO BE SOLVED: To allow a worker with little experience to apply machining excellent in shape accuracy by preparing parameters prior to machining, calculating a correction path, and moving the center of a wire on the correction path of a corner section SOLUTION: The position apart from the point F by the distance registered on a data storage device and an offset quantity on a path FG is set as a correction completion point K (step S140), and the coordinates of the correction completion point K and the inclination of the path FG on the XY coordinate system are substituted in the outlet side correction equation g(X, Y) registered on the data storage device to establish the g(X, Y) (step S150) The intersection of the inlet side correction equation f(X, Y) and outlet side correction equation g(X, Y)is obtained (step S160), and when the intersection exists, a stored path S50 is substituted for the correction path (step S170)

Wire electrical discharge machining method and its device

PROBLEM TO BE SOLVED: To provide electrodes for diesinking electric discharge machining and a diesinking electric discharge machine which are capable of improving the shape accuracy and the working efficiency. SOLUTION: An inlet 22 and an outlet 23 are provided at the positions of an electrode 21, which are not related to the machining, and the inlet 22 and the outlet 23 are connected by an internal passage 24. During machining, a cooling medium 30 is supplied from the inlet 22 to cool the electrode 21, and the cooling medium 30 heated up is discharged outside from the outlet 23. Further, holes 27, 28 engaging the inlet 22 and the outlet 23 are provided in a quill 26 of a diesinking electric discharge machine.

Electrode for diesinking electric discharge machining and diesinking electric discharge machine

PROBLEM TO BE SOLVED: To provide the most-suitable machining conduction to be determined even if a machining electrode has a complex shape and increase an assumed degree of precision of machining time. SOLUTION: In an electrical discharge machine for firming a shape with a shape electrode 1, there is provided means 8 for measuring a height of liquid surface 7 of processing liquid 4 and then a machining area is calculated in reference to a feeding amount of the shape electrode 1 and a varying amount of height of the liquid surface 7. In addition, there is provided means 5 for parting a part of a processing tank 3 into a small region 6 and then means 8 for measuring the height of the liquid surface 7 is arranged in the small region 6. With such an arrangement as above, even if the processing electrode has a complex shape, it is possible to determine the most-suitable processing condition and also it shows an effect that an estimating precision of the processing time is increased.

Yoshizawa Hideyoshi

Papers

Wire electric discharge machine

Machining condition controller for electric discharge machining device

Wire electrical discharge machining method and its device

Electrode for diesinking electric discharge machining and diesinking electric discharge machine

Electrical discharge machine for forming shape