WO2008050407A1 - Appareil de traitement de décharge à fil - Google Patents
Appareil de traitement de décharge à fil Download PDFInfo
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- WO2008050407A1 WO2008050407A1 PCT/JP2006/321181 JP2006321181W WO2008050407A1 WO 2008050407 A1 WO2008050407 A1 WO 2008050407A1 JP 2006321181 W JP2006321181 W JP 2006321181W WO 2008050407 A1 WO2008050407 A1 WO 2008050407A1
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- Prior art keywords
- energy
- machining
- power supply
- open
- processing
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
- B23H7/02—Wire-cutting
- B23H7/04—Apparatus for supplying current to working gap; Electric circuits specially adapted therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H1/00—Electrical discharge machining, i.e. removing metal with a series of rapidly recurring electrical discharges between an electrode and a workpiece in the presence of a fluid dielectric
- B23H1/02—Electric circuits specially adapted therefor, e.g. power supply, control, preventing short circuits or other abnormal discharges
- B23H1/022—Electric circuits specially adapted therefor, e.g. power supply, control, preventing short circuits or other abnormal discharges for shaping the discharge pulse train
Definitions
- the present invention relates to a wire discharge cache device.
- a wire discharge carriage device includes a wire that is one electrode that travels in the vertical direction and a workpiece that is the other electrode whose movement is controlled in a plane perpendicular to the travel direction of the wire. Arranged to face each other, generate a pulsed discharge in the machining gap between the wire and the workpiece (that is, between the electrodes), and machine the workpiece into the desired shape using the thermal energy at that time Device.
- a workpiece is directly connected to one electrode end of a machining power supply, and a traveling wire is applied via a feeding point that is in sliding contact.
- the power supply point is generally provided at two locations above and below the position facing the workpiece of the wire. In other words, the discharge current flow path flowing through the wire has two circuits in parallel on the upper side and the lower side of the workpiece.
- a sub-discharge power source for inducing a small current spark discharge (preliminary discharge) and a main current for supplying a large current as a machining current after the occurrence of the spark discharge are provided.
- Rough force and finishing force are implemented using two power sources for processing, including a power source for electric discharge.
- Patent Document 1 a switching element for individually opening and closing a current path is provided in each of the current paths from the main discharge power source to the upper and lower power supply points, and the main power source is connected only from one power supply point. It is configured so that one-side power can be supplied to supply machining current, and the upper side A technique is disclosed in which the upper side power supply only from the lower side and the lower side power supply only from the lower side are switched every predetermined number of pulse voltages applied continuously. As a result, it is possible to energize a large current without causing the wire electrode to generate heat, and to prevent breakage due to heat generation.
- Patent Document 2 a switching element that individually opens and closes a current path is provided in each of the current paths that reach the upper and lower power supply points of the main discharge power supply, and the main discharge power source is connected only from one power supply point.
- a technique has been disclosed in which a single-side power supply for supplying a machining current can be performed, and the upper-side power supply and the lower-side power supply are switched asynchronously. As a result, it is possible to prevent the occurrence of concentrated discharge, so that the wire electrode can be prevented from being disconnected by heating.
- Patent Document 3 there is provided a device for measuring the discharge position in the vertical direction of the machining gap from the difference value and the magnitude relationship of the currents flowing from the sub-discharge power source to the upper and lower feeding points.
- a switching element that opens and closes the current path individually is provided for each of the current paths from the main discharge power supply to the upper and lower feeding points, and spark discharge occurs at the upper end of the machining gap. If the spark discharge occurs at the lower end side of the machining gap, the lower side feed is performed.If the spark discharge occurs at the wall thickness center of the workpiece, the upper and lower sides are fed.
- a technology is disclosed in which power is supplied from both sides at the same time.
- the wire travel path between the upper and lower wire guides is positioned in the up-down direction with the position facing the workpiece being sandwiched between them.
- the machining liquid nozzles are provided in close proximity to each other, and high pressure machining liquid is sprayed into the machining gap from above and below, so that the wire electrode 1 can be cooled and the discharge cache debris can be removed.
- Patent Document 1 JP 59-47123 A
- Patent Document 2 JP-A-1-97525
- Patent Document 3 Japanese Patent Publication No. 6-61663 Disclosure of the invention
- Patent Document 3 since the one-side power feeding method and the upper and lower both-side power feeding method are used in combination, the force that is considered to enable stable machining by avoiding frequent occurrence of this short-circuit is a cause of wire breakage. In addition to the cooling performance of the wire electrode by the machining fluid, there is a machining energy imbalance that causes the machining energy to be locally excessive due to the occurrence of concentrated electric discharge, so the wire disconnection problem still exists .
- Patent Document 3 states that the cause of overheating that causes wire breakage is insufficient cooling at the center in the upper and lower direction of the machining gap. Insufficient cooling at the center in the upper and lower direction of the machining gap It can be improved by adjusting the spray amount. However, even when the cooling at the center in the vertical direction of the gap is improved in this way, if there is an imbalance in processing energy, wire breakage will occur as well.
- the present invention has been made in view of the above, and provides a wire electric discharge machining apparatus capable of improving a machining speed by avoiding a wire breakage based on an energy imbalance occurring between electrodes. With the goal.
- the present invention provides a power supply path for supplying a discharge current from a machining power source between the electrodes, which is a machining gap between a wire electrode and a workpiece.
- a power supply path for supplying a discharge current from a machining power source between the electrodes, which is a machining gap between a wire electrode and a workpiece.
- Upper part An upper side path passing through the upper side feeding point provided in sliding contact with the wire electrode on the side, and a lower side path passing through the lower side feeding point provided in sliding contact with the wire electrode on the lower side of the workpiece
- the upper side path and the lower side path can be individually opened / closed by an upper side path opening / closing means and a lower side path opening / closing means, and either the upper side path or the lower side path.
- a power supply is implemented by mixing a single-side power supply method that uses both paths and an upper and lower both-side power supply method that uses both paths simultaneously, and the upper and lower sides are used as commands for realizing a desired power supply mode in each power supply system.
- An opening / closing pattern setting means for setting an opening / closing pattern for controlling the opening / closing of the path individually or simultaneously, and between the upper side feeding point and the lower side feeding point between the poles
- the discharge position detection means for detecting the discharge position based on the value of the sub-discharge current or the main discharge current respectively supplied, and the discharge position detection means within the period from the current time to a certain past period are detected.
- the machining energy calculation means for obtaining the machining energy at the current position of the wire electrode, and the cache energy calculated by the above-mentioned energy calculation means.
- machining energy distribution changing means for generating an opening / closing pattern changed so as to obtain a predetermined machining energy distribution that can eliminate the imbalance
- Serial processing energy distribution changes if taken delivery the modified open pattern from the unit is characterized that you and a driving means for performing in accordance with opening and closing pattern change.
- the path opening / closing means provided in the upper power supply path and the lower power supply path from the machining power source to the machining gap (between the poles) are individually opened and closed by the opening / closing pattern preset in the opening / closing pattern setting means.
- the machining energy calculation means discharges machining energy within a certain period in the past.
- the discharge current value at each position is integrated and obtained, and the energy distribution changing means obtains the machining energy distribution in the vertical direction of the machining gap based on this, and checks whether there is an energy imbalance.
- the wire speed can be improved by avoiding the wire breakage.
- FIG. 1 is a conceptual diagram showing a main configuration of a wire electric discharge machining apparatus according to Embodiment 1 of the present invention.
- FIG. 2 is a diagram for explaining a relationship between a discharge position and a discharge current value at the time of each one-side power feeding on the upper side and the lower side.
- FIG. 3 is a conceptual diagram showing a main configuration of a wire electric discharge machining apparatus according to Embodiment 2 of the present invention.
- FIG. 4 is a conceptual diagram showing a main configuration of a wire electric discharge machining apparatus according to Embodiment 3 of the present invention.
- FIG. 5 is a conceptual diagram showing a main configuration of a wire electric discharge machining apparatus according to Embodiment 4 of the present invention.
- FIG. 1 is a schematic diagram showing the main configuration of a wire electric discharge machining apparatus according to Embodiment 1 of the present invention.
- reference numeral 1 denotes a wire electrode.
- the wire electrode 1 is guided by wire guides 2 and 3 arranged at appropriate intervals in the upward and downward directions, and travels by force from the upper side to the lower side, for example.
- a thick plate-like work piece 4 is placed on a plane perpendicular to the wire travel direction with a predetermined work gap (this is the ⁇ pole ”And”) are placed opposite each other.
- An upper feeding point 5 is provided in the vicinity of the upper wire guide 2 and a lower feeding point 6 is provided in sliding contact with the wire electrode 1 at a position near the lower wire guide 3! /
- the machining fluid nozzles are respectively provided at positions close to each other in the vertical direction across the position facing the workpiece 4 in the wire travel path between the force wire guides 2 and 3 (not shown). It is possible to cool the wire electrode 1 and eliminate the discharge calorie debris by spraying a machining fluid with vertical force and high pressure on the machining gap.
- a sub-discharge power source 7 and a main discharge power source 8 are provided as processing power sources for the electric discharge machining portion.
- the sub-discharge power source 7 mainly applies a small sub-discharge current between the electrodes for the purpose of detecting the inter-electrode state of the machining gap (between the electrodes) between the wire electrode 1 and the workpiece 4. Generate relatively low voltage pulses to be supplied.
- the main discharge power source 8 generates a voltage pulse having a predetermined level and a predetermined pulse width higher than the sub-discharge power source 7 in order to supply a main discharge current which is a large processing current mainly between the electrodes.
- One electrode end of the sub-discharge power source 7 is directly connected to the workpiece 4.
- the other electrode end of the sub-discharge power source 7 is connected to the upper feeding point 5 through the upper sub-feeder line 9, and the upper sub-switching element 10 is inserted in the middle of the upper sub-feeder line 9. Yes.
- the other electrode end of the sub-discharge power source 7 is connected to the lower feeding point 6 via the lower sub-feeder line 11, and the lower sub-switching element 12 is inserted in the middle of the lower sub-feeder line 11. Yes.
- One electrode end of the main discharge power supply 8 is directly connected to the workpiece 4.
- the other electrode end of the main discharge power supply 8 is connected to the upper feeding point 5 through the upper main feeder line 13, and the upper main switching element 14 is inserted in the middle of the upper main feeder line 13. Yes.
- the other electrode end of the main discharge power supply 8 is connected to the lower feeding point 6 via the lower main feeder line 15, and the lower main switching element 16 is inserted in the middle of the lower main feeder line 15.
- switching elements 10, 12, 14, and 16 are described here as semiconductor switching elements, relays can be used as well.
- each current path is provided with a switching element that opens and closes that path.
- the main discharge current can be supplied from the main discharge power supply 8 by switching between the upper and lower both-side power supply method using two upper and lower power supply points and the one-side power supply method using one of the V and one of the power supply points. It is configured.
- the upper main feeder line 13 Since only the circuit is closed, the main discharge current is supplied between the electrodes via the upper main feeder line 13 and the upper feeding point 5.
- Such upper “lower” sub-switching elements 10, 12 are turned on / off and upper “lower” main switching elements 14, 16 are turned on / off by a drive signal from an oscillator 24 described later.
- Force to be applied Upper 'lower sub-switching elements 10 and 12 are supplied with main discharge current with upper and lower main switching elements 14 and 16 controlled on and off.
- the upper and lower main switching elements 14 and 16 are connected to the corresponding ones and turned on and off in the same way.
- the description will focus on the on / off control of the upper and lower main switching elements 14 and 16.
- the cause of the wire breakage includes not only the cooling performance of the wire electrode by the machining liquid, but also the machining energy in which the energy is locally excessive due to the occurrence of concentrated discharge. There is an imbalance.
- the main discharge current 8 between the main discharge currents 8 is controlled by turning on and off the upper and lower main switching elements 14 and 16.
- An energy distribution changing means 21a, an open / close pattern setting means 23, and an oscillator 24 are provided.
- the processing energy distribution changing means 21a includes power supply pattern changing means 22a.
- FIG. 2 is a diagram for explaining the relationship between the discharge position and the discharge current value at the time of each one-side power feeding on the upper side and the lower side.
- a sub discharge (preliminary discharge) is performed by applying a pulse voltage from the sub-discharge power source 7 to the opposing gap (between the electrodes) between the wire electrode 1 and the target object 2. ) Is generated. Thereafter, a pulse voltage is continuously applied between the main discharge power supply 8 and the main discharge current is supplied.
- the main discharge current at the time of upper-side power feeding for turning on only the upper main switching element 14 passes through the upper feeding point 5, the wire electrode 1, the discharge path in the machining gap, and the workpiece 4. Flows to the main discharge power source 8.
- the main discharge current during upper power supply is large when the discharge position is on the upper end side of the machining gap and smaller when it is on the lower end side. .
- the main discharge current at the time of lower side feeding that turns on only the lower main switching element 16 passes through the lower feeding point 6, the wire electrode 1, the discharge path in the machining gap, and the workpiece 4. It flows to the main discharge power supply 8.
- the impedance from the main discharge power supply 8 to the discharge position increases as the discharge position is generated at a position farther from the lower feeding point 6. Therefore, the discharge current at the time of lower-side power feeding becomes large when the discharge position is small at the lower end side when the discharge position is at the upper end side of the machining gap as shown in the characteristic (b) shown in FIG.
- machining energy becomes large at the upper end of the machining gap during upper-side feeding or both-upper and lower-side feeding, this is performed by switching to lower-side feeding and during lower-side feeding or both upper and lower sides. If machining energy is small on the lower end side of the machining gap during power feeding, switching to upper side feeding will further reduce the machining energy difference between the upper end side and lower end side of the machining gap when feeding both upper and lower sides. ⁇ By adjusting each power supply mode on the lower side, it is possible to improve machining energy imbalance, and to avoid wire breakage and improve machining speed.
- the open / close pattern setting means 23 simultaneously turns on / off the upper and lower sub-switching elements 10 and 12 and closes the upper and lower sub-feeder lines 9 and 11.
- the upper and lower main feeders are controlled by turning on and off the upper and lower main switching elements 14, 16 when supplying the main discharge current, which is a command for creating a path for causing sub-discharge.
- Three types of opening / closing patterns are initially set, when lines 13 and 15 are closed simultaneously, and when one of the upper and lower main feeder lines 13 and 15 is closed and the other is opened. At this time, each of these three open / close patterns has an upper and lower main switching element so that short-circuits do not occur frequently and the processing speed is excellent when power is supplied from the corresponding power supply path.
- the on / off control timing of 14 and 16 and the number of times (the number of times of power feeding) are set.
- the open / close pattern setting means 23 first gives an open / close pattern, which is a command for creating a path for causing a sub-discharge, to an oscillator 24 to be described later, and when the main discharge current is supplied thereafter, the above-described three open / close patterns are provided. Given a pattern, the two single-sided feeding methods and the upper and lower both-side feeding methods are mixed at a predetermined ratio.
- the current sensor 17 measures a sub-discharge current flowing through the upper sub-feeder line 9 during sub-discharge and gives it to the discharge position detection means 19.
- the current sensor 18 measures the sub-discharge current flowing through the lower sub-feeder line 11 during sub-discharge, and supplies it to the discharge position detecting means 19.
- the current sensors 17 and 18 may be provided on the upper and lower main feeder lines 15 and 16 to measure the main discharge current.
- the discharge position detecting means 19 calculates the discharge position using the current value via the upper feeding point 5 measured by the current sensor 17 and the current value via the lower feeding point 6 measured by the current sensor 18.
- the machining energy calculation means 20 is calculated by the discharge position detection means 19 during one integration time of machining energy when the above-described power supply is performed by the opening / closing pattern set by the opening / closing pattern setting means 23 during main discharge. Then, the main discharge current value is integrated for each detected discharge position, and the applied energy at the current machining position of the wire electrode 1 moving in the vertical direction is obtained.
- the amount of time required to calculate the machining energy is the time interval that defines how much the current time force is accumulated as the amount of discharge current up to the past time. It is.
- the unit amount of the machining energy integration time the movement distance of the wire electrode in the vertical direction or the number of discharge pulses may be used.
- the machining energy from the present to the past fixed period may be obtained by averaging processing using, for example, a low-pass filter or the like, which is described as being obtained by integrating with time.
- the machining energy integration time is too short or too long, the machining energy distribution changing means 21a cannot correctly obtain the machining energy distribution at the current machining position. It is necessary to set appropriately by the method.
- the integration time needs to be at least 100 sec.
- the machining energy distribution changing means 21a stores the machining energy during an integration time appropriately determined in advance as the target machining energy. Increasing the machining energy during the integration time improves the machining speed, but wire breakage tends to occur, and vice versa. Therefore, the machining energy distribution changing means 21a stores the machining energy during the accumulated time in which the machining speed and the difficulty of wire breakage are balanced as the target machining energy.
- the machining energy distribution changing means 21a converts the machining energy distribution in the vertical direction of the machining gap in the current power supply state by the execution of the opening / closing pattern set by the opening / closing pattern setting means 23 into the machining energy calculating means. If there is an imbalance in the machining energy distribution, check the machining energy imbalance by comparing the calculated machining energy distribution with the target machining energy and comparing the magnitude relationship between the calculated machining energy distribution and the target machining energy. Then, an open / close pattern modified so as to obtain a predetermined processing energy distribution capable of eliminating the imbalance is generated and issued to the oscillator 24.
- the first mode is a mode of generating an opening / closing pattern that is changed to a processing energy distribution that reduces a processing energy difference between the upper end side and the lower end side of the processing gap.
- the second mode is a mode in which an opening / closing pattern is generated by changing the cache energy obtained by the processing energy calculation means 20 so as to approach the target processing energy.
- the processing energy distribution changing means 21a in the first embodiment includes power feeding pattern changing means 22a as means for specifically realizing the above two modes. That is, the power feeding pattern changing means 22a uses the upper side path for the opening / closing pattern set by the opening / closing pattern setting means 23 according to the magnitude of the imbalance of the existing machining energy. This is realized by changing the ratio of the number of times of power supply to the number of times of power supply of the lower path force and changing it to an open / close pattern and issuing it to the oscillator 24.
- the feeding pattern changing means 22a is used when the machining energy distribution is smaller than the target energy, that is, when there is no machining energy imbalance.
- an open / close pattern having the same contents as the open / close pattern set by the open / close pattern setting means 23 is generated and issued to the oscillator 24.
- the power feeding pattern changing unit 22a uses the open / close pattern set by the open / close pattern setting unit 23.
- An open / close pattern is generated by changing the lower power supply frequency ratio to a value higher than the predetermined value and issued to the oscillator 24.
- the power feeding pattern changing unit 22a opens and closes the opening / closing pattern set by the opening / closing pattern setting unit 23.
- An open / close pattern is generated by changing the upper-side power supply frequency ratio at a higher value than the predetermined value and issued to the oscillator 24.
- the power supply pattern changing unit 22a obtains the second aspect by integrating the main discharge current values at all the discharge positions during the integration time appropriately set by the machining energy calculating unit 20.
- the open / close pattern set by the open / close pattern setting means 23 in accordance with the magnitude of the cab energy is an open / close pattern in which the ratio of the number of times of power supply between the one-side power supply using the upper path and the one-side power supply using the lower path is different. This is realized by issuing to oscillator 24.
- the oscillator 24 performs power supply in accordance with the open / close pattern received from the open / close pattern setting means 23.
- the open / close pattern received from the power supply pattern changing means 22a is the same, Use the open / close pattern received from means 23. That is, using the power supply frequency ratio specified in the open / close pattern received from the open / close pattern setting means 23, the drive signal for turning on / off the switching element corresponding to the power supply frequency is continuously output.
- the open / close pattern set in the open / close pattern setting means 23 Two single-side feeds and top and bottom both-side feeds are mixed, but the open / close pattern set in the open / close pattern setting means 23 does not cause short-circuits frequently and has a high number of feeds with excellent machining speed. Since the ratio is set, the machining speed can be improved.
- the oscillator 24 performs power supply in the mixed mode according to the open / close pattern received from the open / close pattern setting unit 23, the open / close pattern received from the power supply pattern changing unit 22a is different.
- a drive signal for turning on / off the switching element is output so that power supply is performed at the ratio of the number of times of power supply.
- the open / close pattern set by the open / close pattern setting means 23 according to the magnitude of the machining energy obtained by the machining energy calculating means 20 during the integration time from the power feeding pattern changing means 22a is referred to as two one-side power feeding.
- opening and closing turns with different power supply ratios with respect to the upper and lower sides of the power supply are implemented, wire breakage can be avoided and machining speed can be improved.
- the processing energy imbalance is checked from the cache energy distribution obtained from the processing energy within a certain period in the past from the current time. If there is a processing energy difference that causes a wire breakage between the power supply path on the lower side and the power supply path on the lower side, the open / close pattern that is currently being used is the ratio of the number of power supply cycles so that the processing energy difference is reduced. By switching to an open / close pattern with changed power supply, the wire breakage can be avoided with higher safety.
- the open / close pattern currently being fed is changed so that the feeding frequency ratio between the upper and lower both-side feeding and the two one-side feeding differs.
- FIG. 3 is a conceptual diagram showing a main configuration of a wire electric discharge machining apparatus according to Embodiment 2 of the present invention.
- components that are the same as or equivalent to the components shown in FIG. 1 are assigned the same reference numerals.
- the description will focus on the part related to the second embodiment.
- the wire electric discharge machining apparatus has a machining energy distribution changing means in place of the machining energy distribution changing means 21a in the configuration shown in FIG. 1 (Embodiment 1).
- 21b is provided, and the machining energy distribution changing means 21b includes power supply pulse energy changing means 25a.
- the machining energy distribution changing means 21b stores a target machining energy that can be machined with less wire breakage and excellent machining speed. Then, the machining energy distribution changing means 21b performs machining in the vertical direction of the machining gap, which is the current power supply state according to the open / close pattern set by the open / close pattern setting means 23, from the energy determined by the machining energy calculating means 20. The energy distribution is obtained, the magnitude relation between the obtained machining energy distribution and the above-mentioned target machining energy is compared to determine whether the machining energy is unbalanced. If there is an imbalance in the machining energy distribution, An open / close pattern changed so as to obtain a predetermined processing energy distribution that can cancel the equilibrium is generated and issued to the oscillator 24.
- the first mode is a mode in which an opening / closing pattern changed to a processing energy distribution that reduces the processing energy difference between the upper end side and the lower end side in the thickness direction of the workpiece 4 is generated.
- the second mode is a mode in which the opening / closing pattern is generated by changing the processing energy obtained by the processing energy calculating means 20 so as to approach the target processing energy.
- the machining energy distribution changing means 21b in the second embodiment is a means for specifically realizing the above two aspects, and is a power supply pulse energy changing means for changing the power supply pulse energy per one power supply pulse. It has 25a.
- there are two ways to change the power supply pulse energy a method to increase or decrease the power supply current value and a power supply time length. Any method may be adopted. A specific configuration example is shown below.
- the power supply pulse energy changing means 25a changes the above-mentioned first mode by using the upper and lower patterns, which are set by the open / close pattern setting means 23, according to the size of the existing processing energy imbalance. This is realized by changing to an open / close pattern in which the power supply pulse energy is different between the power supply from the side path and the power supply from the lower side path and issuing it to the oscillator 24.
- the power supply pulse energy changing means 25a is provided with an open / close pattern setting means 23 when the machining energy distribution is smaller than the target energy, that is, when there is no machining energy imbalance. Generates an open / close pattern with the same contents as the open / close pattern set in, and issues it to the oscillator 24.
- the power supply pulse energy changing means 25a is set by the opening / closing pattern setting means 23 when the above processing energy distribution is larger than the above target energy at the upper end side of the workpiece 4.
- An open / close pattern in which the power supply pulse energy at the time of upper side power supply by the open / close pattern is changed to a value smaller than a predetermined value is generated, or at the time of lower side power supply by the open / close pattern set by the open / close pattern setting means 23
- An open / close pattern in which the power supply pulse energy is changed to a value higher than a predetermined value is generated and issued to the oscillator 24.
- the power supply pulse energy changing means 25a has an opening / closing pattern when the machining energy distribution is larger than the target machining energy on the lower end side of the workpiece 4.
- An open / close pattern is generated by changing the power supply pulse energy at the time of upper-side power supply by the open / close pattern set by the setting means 23 to a higher value than the predetermined value, or the open / close pattern set by the open / close pattern setting means 23
- An open / close circuit is generated by changing the power supply pulse energy at the time of the lower power supply by the pattern to a value smaller than a predetermined value, and is issued to the oscillator 24.
- the power supply pulse energy changing means 25a performs the above-described change processing of the power supply pulse energy with the upper side power supply and the lower side power supply when the upper and lower sides are supplied with the open / close pattern set by the open / close pattern setting means 23. It may be carried out simultaneously with the side power supply.
- the power supply pulse energy changing unit 25a integrates the main discharge current values at all the discharge positions during the integration time appropriately set by the power calculation unit 20 according to the second mode.
- the open / close pattern set by the open / close pattern setting means 23 according to the size of the processing energy obtained in the above is used for both the upper side path and the lower side path. This is realized by changing the power supply pulse energy to a different open / close pattern for both-side power supply and issuing it to the oscillator 24.
- the oscillator 24 performs power supply according to the opening / closing pattern received from the opening / closing pattern setting means 23.
- the switching pattern received from the setting means 23 is used, that is, a drive signal for turning on and off the corresponding switching element so as to supply the same power supply pulse energy as currently implemented is output.
- the open / close pattern set in the open / close pattern setting means 23 causes the vertical Although both sides feeding and two one side feeding are carried out in a mixed manner, when the opening / closing pattern set in the opening / closing pattern setting means 23 is implemented, short-circuits do not occur frequently and the machining speed is excellent. Since the feed pulse energy can be input to the feed path, the machining speed can be improved.
- the oscillator 24 changes the power supply pulse energy when performing the above-mentioned mixed power supply according to the open / close pattern received from the open / close pattern setting means 23.
- the open / close pattern received from the stage 25a is different, the open / close pattern received from the open / close pattern setting means 23 is not used, and the designated feed path (two One or both of the power supply paths on one side) outputs a drive signal for on / off control of the corresponding switching element so that the specified power supply pulse energy can be supplied.
- the open / close pattern set by the open / close pattern setting means 23 according to the machining energy obtained by the machining energy calculation means 20 during the integration time from the power supply pulse energy changing means 25a
- wire breakage can be avoided and machining speed improved as described above.
- the presence or absence of machining energy imbalance is checked from the cache energy distribution obtained from the machining energy within a certain period in the past from the current time.
- feed the current open / close pattern so as to reduce the machining energy difference 1 pulse. Since power supply is performed using an open / close pattern in which the per-feed pulse energy is changed, it is possible to avoid wire breakage with a higher degree of safety.
- the open / close pattern that is currently being fed can be fed between the top and bottom side feeds and the two side feeds.
- FIG. 4 is a schematic diagram showing the main configuration of a wire electric discharge machining apparatus according to Embodiment 3 of the present invention.
- components that are the same as or equivalent to the components shown in FIG. 1 are assigned the same reference numerals.
- the description will be focused on the part related to the third embodiment.
- the wire electric discharge machining apparatus has a configuration shown in FIG. 1 (Embodiment 1), instead of machining energy distribution changing means 21a.
- a distribution changing means 21c is provided.
- the machining energy distribution changing means 21c includes a reference machining pulse energy setting means 26 that receives the output of the machining energy calculation means 20, and a power supply pattern changing means 22b that receives the output of the reference machining pulse energy setting means 26.
- the output of means 22b is provided to oscillator 24.
- the reference machining pulse energy setting means 26 sets a reference machining pulse energy to be referred to as an output target of the machining energy calculation device 20.
- the reference machining pulse energy setting means 26 receives the cache energy obtained during the integration time appropriately set from the machining energy calculation unit 20, the reference machining pulse energy and the reference machining pulse energy corresponding thereto are fed. Give to change means 22b.
- the power feeding pattern changing means 22 b generates an open / close pattern in which the power feeding frequency ratio is changed so that the force energy obtained by the machining energy computing device 20 approaches the reference machining energy, and gives the generated open / close pattern to the oscillator 24.
- the power supply pattern changing means 22b has a case where the machining energy obtained by the machining energy calculation device 20 is larger at the upper end side and smaller at the lower end side than the reference machining energy. Then, the open / close pattern set by the open / close pattern setting means 23 is changed to an open / close pattern with a low upper-side power supply frequency ratio and is given to the oscillator 24.
- the power supply pattern changing means 22b is configured to open / close patterns depending on whether the machining energy obtained by the machining energy computing unit 20 is small on the upper end side or larger on the lower end side with respect to the reference machining energy.
- the open / close pattern set by the setting means 23 is changed to an open / close pattern with a high ratio of the number of times of feeding on the upper side, and is given to the oscillator 24.
- the power supply pattern changing means 22b is such that the machining energy obtained by the machining energy calculation device 20 is large on both the upper end side and the lower end side of the machining gap with respect to the reference machining energy. If the opening / closing pattern setting means 23 changes to an opening / closing pattern with a lower ratio of both upper and lower power supply cycles, and the machining energy is small on both the upper and lower sides of the machining gap, The open / close pattern set by the pattern setting means 23 is changed to an open / close pattern with a high ratio of the number of times of feeding on both upper and lower sides, and each is supplied to the oscillator 24.
- the open / close pattern is changed, and the wire breakage is avoided by realizing a uniform cache energy distribution on the wire electrode. Showed how to do.
- wire electrode 1 is conveyed by force from the upper side to the lower side of the workpiece 4, but the wire electrode 1 is depleted by discharge in the process of moving from the upper end side to the lower end side of the machining gap. It becomes thin.
- the feed rate of the wire electrode 1 is low or when the energy of one discharge pulse is large, the amount of wear of the wire electrode 1 increases. Therefore, if the discharge position is at the upper end side of the additional gap and at the lower end side, the wire electrode 1 is likely to break at a position corresponding to the lower end side of the process gap. Become.
- the reference machining energy is set so that the machining energy is smaller than that at the upper end side.
- the reference machining energy is set in advance as a target value of machining energy within a certain period in the past from the current time, and from the magnitude relationship between the two, By switching the current open / close pattern to an open / close pattern whose power supply frequency ratio has been changed so as to reduce the machining energy difference, power supply is performed. This makes it possible to achieve higher safety and avoid wire breakage.
- FIG. 5 is a conceptual diagram showing a main configuration of a wire electric discharge machining apparatus according to Embodiment 4 of the present invention.
- FIG. 5 the same or same components as those shown in FIG. 1 (Embodiment 1) are shown. Components that are equivalent are labeled with the same reference numerals.
- the description will be focused on the part related to the fourth embodiment.
- the wire electric discharge machining apparatus has the same configuration as shown in FIG. 1 (Embodiment 1), but instead of the machining energy distribution changing means 21a.
- a distribution changing means 21d is provided.
- the machining energy distribution changing means 21d includes the above-described reference machining pulse energy setting means 26 that receives the output of the machining energy calculation means 20, and a power supply pulse energy changing means 25b that receives the output of the reference machining pulse energy setting means 26.
- the output of the power supply pulse energy changing means 25b is given to the oscillator 24. Since the reference machining pulse energy setting means 26 has been described in the third embodiment, here, the power supply pulse energy changing means 25b for changing the power supply pulse energy per one power supply pulse will be described.
- the feed pulse energy changing means 25b generates an open / close pattern in which the feed pulse energy per pulse is changed so that the calorie energy obtained by the machining energy calculation device 20 approaches the reference machining energy. To give.
- the power supply pulse energy changing means 25b is configured so that when the machining energy obtained by the machining energy calculation device 20 is larger on the upper end side of the machining gap than the reference machining energy, Power supply The pulse energy per pulse is changed to a small open / close pattern and applied to the oscillator 24.
- the power supply pulse energy changing means 25b supplies power at the time of upper-side power supply when the energy determined by the calorie energy calculation device 20 is smaller at the upper end side of the processing gap than the reference processing energy.
- the power supply pulse energy per pulse is changed to an open / close pattern that is increased and applied to the oscillator 24.
- the power supply pulse energy changing means 25b supplies power at the time of lower-side power supply when the energy determined by the calorie energy calculation device 20 is larger at the lower end side of the processing gap than the reference processing energy. The power supply pulse energy per pulse is changed to an open / close pattern that is reduced, and then applied to the oscillator 24. [0106] In addition, the power supply pulse energy changing means 25b supplies power at the time of lower-side power supply when the energy determined by the calorie energy calculation device 20 is smaller at the lower end side of the processing gap than the reference processing energy. The power supply pulse energy per pulse is changed to an open / close pattern that is increased and applied to the oscillator 24.
- the power supply pulse energy changing means 25b is configured to detect both the upper and lower sides when the machining energy obtained by the added energy calculation device 20 is smaller than the reference machining energy at both the upper end side and the lower end side of the machining gap. Power supply at the time of power supply Change to an open / close pattern that increases the power supply pulse energy per pulse, and conversely if the machining energy is large on both the upper and lower sides of the machining gap, power supply during both upper and lower power supply 1 The power supply pulse energy per pulse is changed to a smaller switching pattern, and each is applied to the oscillator 24.
- the reference machining energy can be set so as to give a specific non-uniform distribution according to the discharge position, and the wire due to wear of the wire electrode or the vertical imbalance of the amount of the working fluid Disconnection can be avoided.
- the reference machining energy is set in advance as a target value of machining energy within a certain period in the past from the current time.
- the switching pattern implemented with this power supply method is switched to an open / close pattern that changes the power supply pulse energy per pulse so as to reduce the difference in machining energy. Avoidance is possible.
- the processing energy distribution changing means 21c, 21d includes a reference machining pulse energy setting means 26 and a power supply pattern changing means 22b or a power supply pulse energy changing means 25b. Even when only the reference machining pulse energy setting means 26 is provided, the machining energy distribution changing means 21c, 21d has a machining energy distribution that reduces the difference between the machining energy required by the machining energy calculation means 20 and the reference machining energy. If a modified open / close pattern is generated, the machining energy distribution can be made closer to the optimum machining energy distribution. Thus, wire breakage can be avoided. In the same manner as described above, it is possible to avoid wire breakage due to depletion of the wire electrode and up-and-down imbalance of the amount of Kaloe liquid.
- the wire electric discharge device is useful for improving the processing speed by avoiding the wire breakage based on the energy imbalance occurring between the electrodes.
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/445,207 US8003911B2 (en) | 2006-10-24 | 2006-10-24 | Wire electrical discharge machining apparatus |
JP2008540835A JP4921484B2 (ja) | 2006-10-24 | 2006-10-24 | ワイヤ放電加工装置 |
EP06822161A EP2078577B1 (en) | 2006-10-24 | 2006-10-24 | Wire discharge processing apparatus |
PCT/JP2006/321181 WO2008050407A1 (fr) | 2006-10-24 | 2006-10-24 | Appareil de traitement de décharge à fil |
CN2006800562159A CN101528399B (zh) | 2006-10-24 | 2006-10-24 | 线电极放电加工装置 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2006/321181 WO2008050407A1 (fr) | 2006-10-24 | 2006-10-24 | Appareil de traitement de décharge à fil |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2008050407A1 true WO2008050407A1 (fr) | 2008-05-02 |
Family
ID=39324221
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2006/321181 WO2008050407A1 (fr) | 2006-10-24 | 2006-10-24 | Appareil de traitement de décharge à fil |
Country Status (5)
Country | Link |
---|---|
US (1) | US8003911B2 (ja) |
EP (1) | EP2078577B1 (ja) |
JP (1) | JP4921484B2 (ja) |
CN (1) | CN101528399B (ja) |
WO (1) | WO2008050407A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014065095A (ja) * | 2012-09-25 | 2014-04-17 | Canon Marketing Japan Inc | 電源装置、放電加工装置、その制御方法およびプログラム。 |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
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US10514747B2 (en) | 2014-03-24 | 2019-12-24 | Silicon Laboratories Inc. | Low-power communication apparatus with wakeup detection and associated methods |
US9713090B2 (en) * | 2014-03-24 | 2017-07-18 | Silicon Laboratories Inc. | Low-power communication apparatus and associated methods |
US9886412B2 (en) | 2014-03-24 | 2018-02-06 | Silicon Laboratories Inc. | Communication apparatus having an oscillator that is disabled based on idle state detection of a communication link and associated methods |
JP6219785B2 (ja) * | 2014-06-23 | 2017-10-25 | ファナック株式会社 | 断線修復手段を備えたワイヤ放電加工機 |
JP6360212B1 (ja) * | 2017-01-31 | 2018-07-18 | ファナック株式会社 | ワイヤ放電加工機 |
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- 2006-10-24 US US12/445,207 patent/US8003911B2/en not_active Expired - Fee Related
- 2006-10-24 EP EP06822161A patent/EP2078577B1/en not_active Expired - Fee Related
- 2006-10-24 WO PCT/JP2006/321181 patent/WO2008050407A1/ja active Application Filing
- 2006-10-24 CN CN2006800562159A patent/CN101528399B/zh not_active Expired - Fee Related
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Also Published As
Publication number | Publication date |
---|---|
EP2078577A1 (en) | 2009-07-15 |
US20100084378A1 (en) | 2010-04-08 |
JPWO2008050407A1 (ja) | 2010-02-25 |
CN101528399B (zh) | 2011-11-09 |
EP2078577A4 (en) | 2011-03-16 |
US8003911B2 (en) | 2011-08-23 |
EP2078577B1 (en) | 2012-05-23 |
CN101528399A (zh) | 2009-09-09 |
JP4921484B2 (ja) | 2012-04-25 |
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