Daihen Corporation

Osaka, Japan

Daihen Corporation

Osaka, Japan
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Patent
Daihen Corporation | Date: 2017-05-17

A contactless power transmission system C is provided for supplying power contactlessly from a power transmission apparatus A to a power reception apparatus B. The power transmission apparatus A includes a high-frequency power source device 1 for outputting a constant high-frequency current, and power transmission units 21, 22, 23 having serial resonance circuits. The power reception apparatus B includes power reception units 31, 32, 33 having parallel resonance circuits. A power transmission coil Lt1, Lt2, Lt3 of the power transmission unit 21, 22, 23 and a power reception coil Lr1, Lr2, Lr3 of the power reception unit 31, 32, 33 are magnetically coupled. The power transmission units 21, 22, 23 are connected in series, while the power reception units 31, 32, 33 are connected in parallel. Power is transmitted from the power transmission unit 21, 22, 23 to the power reception unit 31, 32, 33 by magnetic field resonance.


Patent
Daihen Corporation | Date: 2017-01-18

A contactless power supply system includes a power transmitter and a power receiver. The power transmitter generates high-frequency power and contactlessly transmits the power to the power receiver. The power transmitter detects reflected power from the power receiver and stops the transmission of the power to the power receiver with reference to the reflected power. The power receiver receives the high-frequency power from the power transmitter and converts the received power into direct current power for charging a power storage device. A switch is operated to electrically connect or disconnect a path to supply the direct current power to the power storage device. The power receiver includes a controller for operating the switch to electrically disconnect the power supply path when the power storage device is in the full charge state.


Patent
Daihen Corporation | Date: 2017-03-29

The purpose of the present invention is to improve the stability of a welding state in a welding method in which the forward feed and backward feed of a welding wire (1) are cyclically repeated and constriction detection control is carried out. Provided is an arc welding control method in which a forward feed period (t1-t3) and a backward feed period (t3-t5) of a feeding speed (Fw) of a welding wire (1) are cyclically repeated to generate a short period (t21-t33) and an arc period (t33-t21), and when detection is made of the constriction of a droplet formed by the welding wire (1) during the short period (t21-t33), a welding current (Iw) is reduced and the short period is switched to the arc period (t33-t21), wherein the sensitivity of constriction detection is changed in accordance with feeding speed (Fw) waveform parameters such as amplitude (W), period (T), and the ratio (D) between the forward feed period (t1-t3) and the backward feed period (t3-t5). Due to this configuration, even if a waveform parameter is changed, the sensitivity of the constriction detection is automatically made appropriate, and therefore, instability in constriction detection control can be suppressed.


Patent
Daihen Corporation | Date: 2017-03-01

The purpose of the present invention is to improve the stability of welding conditions in a welding method that involves cyclically repeating forward feed and reverse feed of a welding wire. Provided is an arc welding control method involving cyclic repetition of forward feed and reverse feed of a welding wire at feed speed (Fw), generating short-circuit intervals and arc intervals, during which arc intervals, application of a first welding current (Iw1) is followed by application of a second welding current (Iw2) smaller than the first welding current (Iw1), wherein the phase of the feed speed (Fw) at the point in time (t21) of transition from an arc interval to a short-circuit interval is detected, and the value (Iw1) and/or the application duration (Tw1) of the first welding current (Iw1) is varied in accordance with the detected phase. In so doing, fluctuation of the phase of the feed speed due to outside disturbances during generation of short-circuiting can be minimized, and therefore the stability of the welding conditions can be improved.


Patent
Daihen Corporation | Date: 2017-01-18

The purpose of the present invention is to reduce the amount of spatter production without detecting constrictions in a welding method in which forward feed and backward feed of welding wire is repeated cyclically. The feed speed (Fw) of the welding wire is switched cyclically between forward feed and backward feed to produce a short-circuit period and an arc period, and the welding current (Iw) is reduced during backward feed in the short-circuit period to shift to the arc period. The reduction in the welding current (Iw) is begun at the time point (t31) at which the backward feed state (Bd) has reached a predetermined standard state. The backward feed duration, the backward feed speed, the backward feed phase, or the backward feed quantity is used as this backward feed state (Bd). Due to this configuration, without detecting constrictions, the welding current (Iw) can be reduced by just an appropriate amount of time before the time point (t33) at which an arc is produced again, and this makes it possible to reduce the amount of spatter production.


Patent
Daihen Corporation | Date: 2017-01-25

The purpose of the present invention is to improve the stability of arc welding carried out by cyclical repetition of forward feed and reverse feed of a weld wire (1). Provided is an arc welding control method involving repeated forward feed and reverse feed at a weld wire (1) feed rate (Fw), according to a prescribed cycle (Tf) and a prescribed amplitude (Wf), and generation of short-circuit time intervals and arc time intervals to carry out welding, wherein the feed rate (Fw) cycle (Tf) and/or the amplitude (Wf) are set automatically on the basis of the average feed rate (Far) and the welding rate (Wsr), or the wire deposition amount (Md) per unit of weld length. Further, in the event that the amplitude (Wf) has changed, feedback control of the forward feed-side shift amount (Sf) is carried out in such a way that the average value of the feed rate (Fw) is constant. In so doing, the feed rate (Fw) cycle (Tf) and amplitude (Wf) are always set to optimal values, and stable welding conditions can be maintained.


Patent
Daihen Corporation | Date: 2017-07-19

Provided is an arc welding control method that carries out forward-reverse feed control alternately switching a welding wire feed rate (Fw) between a forward feed period and a reverse feed period and performs welding by generating a short period and an arc period, wherein during a transient welding period (Tk), a transition to the forward feed period occurs when the arc period comes during the reverse feed period and a transition to the reverse feed period occurs when the short period comes during the forward feed period, and during a steady welding period, switching is carried out alternately between a prescribed forward feed period and a prescribed reverse feed period. Thus, because forward-reverse feed control that differs from that during the steady welding period is carried out during the transient welding period (Tk), the welding state during the transient welding period (Tk) can be stabilized.


Patent
Daihen Corporation | Date: 2017-06-28

Provided is an arc welding control method that performs welding by alternately switching feed rate (Fw) for welding wire (1) between a forward feed period and a reverse feed period, controlling welding voltage (Vw) on the basis of a voltage setting value, and repeating a short period and an arc period, wherein a smoothed value for welding voltage (Vw) is detected and a cycle (Tf) of the feed rate (Fw) is feedback controlled such that this smoothed value for welding voltage and the voltage setting value are the same. Thereby, the cycle (Tf) of the feed rate (Fw) is made appropriate in correspondence with changes in the metal transfer mode accompanying changes in voltage setting value; therefore, it is possible to control occurrences of synchronization offsets in the cycle of forward feed and reverse feed for the feed rate (Fw) and the cycle of the short period and the arc period, and maintain stable welding conditions.


Patent
Daihen Corporation and Fukuda Metal Foil & Powder Co. | Date: 2017-06-28

A metal powder for additive manufacturing includes: not less than 0.2 mass% and not more than 1.3 mass% of aluminum; and a balance including copper and an incidental impurity.


Patent
Daihen Corporation | Date: 2017-01-04

There is provided a carrier device that has a linkage arm mechanism, in particular, a carrier device that cools the linkage arm mechanism and can reduce the impact of radiation heat from a work that is in a high temperature state. A carrier device is a carrier device that includes a linkage arm mechanism and a pivot shaft, and the linkage arm mechanism includes lower arms and upper arms, and one ends of which are respectively connected to the lower arms, and horizontal movement members that support a work that is connected to the other ends of the upper arms, and cooling plates are respectively arranged between the upper arms, and the horizontal movement members.

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