CN102626810B

CN102626810B - Vibration discharge processing method

Info

Publication number: CN102626810B
Application number: CN2012101325603A
Authority: CN
Inventors: 宣浩
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-05-02
Filing date: 2012-05-02
Publication date: 2013-12-04
Anticipated expiration: 2032-05-02
Also published as: CN102626810A

Abstract

A vibration discharge processing method is characterized by comprising the following steps that: (1) an auxiliary power supply is added between an electrode and a workpiece, and in a vibration period, the vibrating electrode and workpiece can generate a contact transient signal and a separating transient signal in the contacting and separating moments; (2) a sampling circuit takes the contact transient signal or the separating transient signal as the sampling signal, and the sampling signal is isolated and then is transmitted to a discharge pulse generator circuit as a triggering signal; (3) a discharge pulse circuit is delayed for delta T and then generates a main pulse; and (4) the main pulse is added between the electrode and the workpiece, so that the electrode and the workpiece discharge within a time interval of generating a processing gap. According to the vibration discharge processing method, the time when the electrode and the workpiece can generate a discharge gap is detected precisely, the pulse added between the electrode and the workpiece is enabled to be an effective pulse, the pulse can discharge at the optimal working gap, the power consumption of the equipment is reduced, and the optimal discharge efficiency is obtained.

Description

A kind of oscillatory discharge processing method

Technical field

The present invention relates to a kind of oscillatory discharge processing method.

Background technology

At present, common discharge-treating method has following two kinds usually: a kind of is the discharging gap that utilizes robot control system(RCS) SERVO CONTROL electrode and workpiece, make the electric discharge corrosion processing in medium (water or kerosene) that electric pulse can be continual and steady, for example, general electric spark machine tool just belongs to this class discharge-treating method; Another kind is to utilize the electrode of vibration to encounter the bounce-back gap that workpiece produces, and the two poles of the earth of the pulse power is connected on respectively on workpiece and electrode to the corrosion processing of being discharged in both vibration gaps.

Utilize the discharged method of corrosion processing of the discharging gap of robot control system(RCS) SERVO CONTROL electrode and workpiece for the first, its equipment relative position is fixed, and mobility is poor, multiplex in the product of processing larger volume and scale; And encounter the discharged method of corrosion processing of bounce-back gap that workpiece produces for the electrode of the second utilization vibration, its equipment mobility is strong, use more flexibly, be applicable to the manual occasion of various needs, can meet the electric discharge shaping demand of mould and some fine product.

In prior art, for above-mentioned the second electric discharge corrosion processing method (utilizing the vibration of workpiece and electrode to touch electric discharge), because the vibration parameters of electrode is uncertain, make from vibration source produce vibration to time of electrode contact workpiece neither a constant, the pulse of general this class discharge equipment is all random and continues to be added between electrode and workpiece, pulse power frequency can't reach and synchronize (can make on the contrary after synchronous electric discharge more unstable) with the electrode vibration frequency, therefore, adopt the discharged following problem of equipment ubiquity of corrosion processing of the oscillatory discharge method of prior art: at first, because pulse voltage is added between electrode and workpiece all the time, human body is encountered the two poles of the earth simultaneously and is had electric-shock feeling, cause use dangerous, secondly, asynchronous due to pulse signal and vibration frequency, in the corrosion process of discharging, have a lot of pulses because the vibration gap is too small and by short circuit, or because vibration excesssive gap and can not regular picture, this just makes the power consumption of equipment increase, energy utilization rate reduces, and discharging efficiency is low.

Summary of the invention

Technical problem to be solved by this invention is to provide a kind of for above-mentioned prior art present situation can effectively reduce equipment power dissipation, discharging efficiency is high and uses more safe and reliable oscillatory discharge processing method.

The present invention solves the problems of the technologies described above adopted technical scheme: a kind of oscillatory discharge processing method is characterized in that including following steps:

(1), add an accessory power supply between tool-electrode and workpiece, the tool-electrode of vibration can produce the bounce-back gap while contacting with workpiece, produce the interrupted phenomenon of signal code, within a vibration period, the tool-electrode of vibration produces respectively a contact jump signal with workpiece in Contact and time of releasing meeting and separates jump signal with one;

(2), sample circuit take described contact jump signal or to separate jump signal be sampled signal, after the signal isolation processing, as triggering signal, sends the discharge pulse circuit for generating to;

(3), described discharge pulse circuit for generating after predefined delay time △ T, produce a main pulse of setting width;

(4), described main pulse is added between described tool-electrode and workpiece after power amplification, makes described tool-electrode and workpiece discharge within the time interval that produces machining gap.

For the ease of realizing, facilitate circuit design and signal sampling, as preferably, described accessory power supply be take the dc source of the little electric current of low pressure as good.This accessory power supply can be also AC power, but will be comparatively complicated for the realization of jump signal sampling, increases the difficulty of circuit design.Accessory power supply only plays the effect that gathers jump signal, and the voltage of this accessory power supply should be as much as possible little, the impact of the signal code produced with the minimizing accessory power supply on discharge current.

Disturb for fear of signal, guarantee the normal operation of discharge circuit, as preferably, the signal isolation in described step (2) adopts photoelectricity isolation or electromagnetic isolation.

Compared with prior art, the invention has the advantages that: with a little electric current of auxiliary low pressure, be added between electrode and workpiece, the jump signal that utilizes tool-electrode to produce in the moment that contacts or separate with workpiece, triggering a pulse of discharge pulse circuit generation is discharged, produce at random the discharge mode of pulse than tradition, the present invention to tool-electrode and workpiece can produce discharging gap the time be carved with one and detect accurately, when tool-electrode and workpiece are released state or while reaching suitable working clearance, the discharge pulse circuit just produces pulse, all the other time circuits do not produce pulse, can guarantee like this within each vibration period, the pulse be added between electrode and workpiece is all effective pulse, pulse can be discharged when the best working clearance, reduce equipment power dissipation, reach best discharging efficiency,

In addition, only within the short time of separating, just add pulse due between electrode and workpiece, there is no voltage between electrode and workpiece at ordinary times, even when pulsed discharge, because clearance distance is very little, most of voltage of discharge loop all drops on inner current-limiting resistance, substantially there is no electric-shock feeling when human body is encountered electrode and workpiece simultaneously, has improved operating personnel's dependability and security.

The accompanying drawing explanation

Fig. 1 is the schematic block circuit diagram that realizes the oscillatory discharge processing method of the embodiment of the present invention.

The specific embodiment

Below in conjunction with accompanying drawing, embodiment is described in further detail the present invention.

The discharge-treating method of the present embodiment is a kind of the discharged method of corrosion processing of bounce-back gap that utilizes generation of vibration, the two poles of the earth of the pulse power are connected on respectively on workpiece and electrode, when encountering workpiece, the electrode of vibration can produce the bounce-back gap, signal code produces interrupted phenomenon, gather the jump signal in the discontinuous current process, thereby determine the precise time of pulsed discharge.

Particularly, the oscillatory discharge method of the present embodiment includes following steps:

(1), add an accessory power supply between tool-electrode and workpiece, within a vibration period, the tool-electrode of vibration can produce respectively a contact jump signal in Contact (initial contact point) and the time of releasing (beginning burble point) with workpiece and separate jump signal with one;

(2), by sample circuit, using contact jump signal or separate jump signal as sampled signal, this sampled signal, after the signal isolation processing, is sent into the discharge pulse circuit for generating as a triggering signal;

(3), the discharge pulse circuit for generating after predefined delay time △ T, produce a main pulse of setting width;

(4), main pulse is added between tool-electrode and workpiece through power amplification, make tool-electrode and workpiece discharge within the time interval that produces machining gap.

In above-mentioned steps, wherein the accessory power supply in step (1) can be dc source, can be also AC power, the voltage of accessory power supply be less than the supply voltage that produces main pulse as much as possible, to prevent producing the pulsed discharge phenomenon after accessory power supply is added to tool-electrode and workpiece; For simplifying circuit structure, make circuit be more prone to realize, the accessory power supply of the present embodiment adopts voltage to be+the little current DC power supply of low pressure of 5V, when the tool-electrode of vibration contacts with workpiece, short circuit between the two, produce a signal code, when vibrating electrode separates with workpiece, open circuit between the two, signal code disconnects.

Interference for fear of main bang to sampled signal, sampled signal in step (2) must be after the signal isolation processing, send into the discharge pulse circuit for generating, the signal isolation processing here can adopt the mode of photoelectricity isolation or electromagnetic isolation to realize again.

Delay time △ T in step (3) can preset according to Oscillation Amplitude usually, the different sampled signals that the size of delay time △ T is got according to sample circuit determine, within a vibration period, when take contact jump signal (this jump signal occurs in the tool-electrode of vibration and the Contact of workpiece) during as sampled signal, delay time △ T will at least be greater than the time of contact of tool-electrode and workpiece, is less than the time of a vibration period simultaneously; When take while separating jump signal (this jump signal occurs in the time of releasing of tool-electrode and the workpiece of vibration) as sampled signal, delay time △ T is less than the disengaging time of tool-electrode and workpiece, so that discharge pulse can occur in the moment of tool-electrode and workpiece generation machining gap.

The present embodiment by adding the accessory power supply of a little electric current of low pressure between tool-electrode and workpiece, utilize the tool-electrode and the jump signal of workpiece in the moment generation that contacts or separate of vibration, triggering a pulse of discharge pulse circuit generation is discharged, this jump signal is sent to the discharge pulse circuit for generating by signal isolation processing (optocoupler or transformer), can produce a main pulse of setting width, reason due to chip removal, sometimes also need the jump signal after the signal isolation processing is carried out to the shaping frequency division again, then after power amplification, be added to again between tool-electrode and workpiece,

Because time of contact or the disengaging time of tool-electrode and workpiece can be determined according to the Oscillation Amplitude of electrode, therefore, can preset tool-electrode and workpiece are added to tool-electrode and workpiece generation working clearance delay time △ T from Contact (or time of releasing) to main pulse, discharged so that main pulse is added in the moment that tool-electrode and workpiece reach optimal working clearance, reached best discharge effect.

The jump signal of the present embodiment only is created in the beginning Contact of tool-electrode and workpiece and starts the time of releasing (in the vibration period), by these two jump signals, the tool-electrode that can obtain accurately vibration and the time of contact of workpiece with separate constantly, correspondingly, the discharge pulse circuit is just usingd any one moment produces in the Contact of tool-electrode and workpiece and the time of releasing jump signal as triggering signal, the a certain moment within the vibration period produces discharge pulse, rather than within the whole vibration period continuous transmitteds all, make discharge pulse more targeted, reduced equipment power dissipation, improved energy utilization rate.

Due within a vibration period, only have within the time in workpiece and tool-electrode generation bounce-back gap, the just conducting of pulse power pipe, not conducting of pulse power pipe in all the other times, above just can not produce lasting voltage between tool-electrode and workpiece like this, even during the pulsed discharge contacted with workpiece at tool-electrode, the working clearance actual range produced due to tool-electrode and workpiece is very little, as long as set suitable current-limiting resistance in discharge loop, most of voltage while discharging also all drops on current-limiting resistance, if human body is encountered tool-electrode and workpiece simultaneously, basically do not have electric-shock feeling, improved operator's safety in utilization.In addition, (the keeping continuous contact between the two) phenomenon if tool-electrode and workpiece are short-circuited in vibration processes, now signal code can not produce jump signal, can the conducting of trigger impulse power tube yet, can not produce pulse current between tool-electrode and workpiece yet, can reduce equipment power dissipation thus, improve utilization rate of electrical.

Than the random discharge mode that produces continuously pulse of tradition, the present embodiment can have one to detect accurately to the time point of tool-electrode and workpiece generation machining gap, guarantee within each vibration period, the pulse be added between electrode and workpiece is all effective pulse, pulse can be discharged when the best working clearance, reach best discharging efficiency.

As shown in Figure 1, the functional block diagram of the electric discharge device of realizing for the discharge-treating method that utilizes the present embodiment, this electric discharge device includes workpiece 1, tool-electrode 2, vibration source 3, main power source 4, accessory power supply 5, pulse power amplifier circuit 6, signal sample circuit 7, buffer circuit 8, signal shaping and delay circuit 91, pulse signal generation circuit 92, wherein, tool-electrode 2 drives the vibration contact between realization and workpiece 1 by vibration source 3, main power source 4 is added on workpiece 1 and tool-electrode 2 and forms the pulsed discharge loop by current-limiting resistance 41 and pulse power amplifier circuit 6, and be added in the accessory power supply 5 between workpiece 1 and tool-electrode 2, can produce jump signal in Contact or the time of releasing of tool-electrode 2 and workpiece 1, jump signal is processed through buffer circuit 8, can produce pulsed discharge by start pulse signal circuit for generating 92 again after signal shaping and delay circuit 91, power amplification circuit 6 is for amplifying the pulse signal produced by pulse signal generation circuit.The concrete control circuit of this electric discharge device can be by various circuit structures realizations of the prior art, and its circuit structure is not the claimed content of the present embodiment, and therefore not to repeat here.

Claims

1. an oscillatory discharge processing method is characterized in that including following steps:

(1), add an accessory power supply between tool-electrode and workpiece, the tool-electrode of vibration can produce the bounce-back gap while contacting with workpiece, produce the interrupted phenomenon of signal code, within a vibration period, produce respectively a contact jump signal in Contact and time of releasing meeting between the tool-electrode of vibration and workpiece and separate jump signal with one;

2. oscillatory discharge processing method according to claim 1, is characterized in that: the dc source that described accessory power supply is the little electric current of low pressure.

3. oscillatory discharge processing method according to claim 1 and 2, is characterized in that: signal isolation employing photoelectricity isolation or electromagnetic isolation in described step (2).