CN109128413A - A kind of electrode clamping mechanism and its method applied to five axis electric machining - Google Patents
A kind of electrode clamping mechanism and its method applied to five axis electric machining Download PDFInfo
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- CN109128413A CN109128413A CN201810800771.7A CN201810800771A CN109128413A CN 109128413 A CN109128413 A CN 109128413A CN 201810800771 A CN201810800771 A CN 201810800771A CN 109128413 A CN109128413 A CN 109128413A
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- electrode
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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
- B23H7/26—Apparatus for moving or positioning electrode relatively to workpiece; Mounting of electrode
- B23H7/32—Maintaining desired spacing between electrode and workpiece, e.g. by means of particulate material
-
- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Abstract
The invention discloses a kind of curved surface EDM parameter methods corresponding with Milling Process parameter established using neural networks principles, this method mainly utilizes now existing 5-shaft linkage numerical control lathe and its digital control system on the market, by the clamping device for designing a kind of line tracking electric machining with wire electrode collocation structure, Application of Neural Network Technology establishes the corresponding relationship in traditional numeric-control processing between numerical control milling parameter and EDM parameter.At the interface of CNC milling machine, Milling Process parameter is inputted, is the EDM parameter needed by Milling Process Parameter Switch by the neural network having built up, final realize completes curved surface electric machining process on the basis of five number of axle Milling Machining centers.The method of the present invention is simple, easy to accomplish, under less expensive cost, by the electric machining that the repacking of existing five-shaft linkage numerically controlled machine may be implemented more deep camber metal surface.
Description
Technical field
The present invention relates to five-axle linkage spark erosion technique domain variabilities to be related to neural network algorithm technical field.
A kind of electrical discharge machining clamp structure with collocation structure is specifically designed, and is designed on this basis a kind of based on five axis
The method that the corresponding relationship of Milling Process parameter and EDM parameter is established at linkage motion cutting center.
Background technique
Since nineteen forty-three former Soviet Union scientist La Zhalinke Mr. and Mrs' invention electric discharge machining method, process generation more than half
The research and development of discipline, electrical discharge machining has become a kind of important manufacturing process, and in subsequent development, it is grand long that Japan increases pool
Professor proposes that line electrode electric spark grinding technology becomes the turning point in electrical discharge machining development history.It is multiple in Modern Manufacturing Science
Miscellaneous Machining of Curved Surface, difficult-to-machine material processing (such as electronic ceramics, high temperature alloy, hard alloy), Complex Different Shape face are (such as: three-dimensional
Curved surface, special-shaped hole slot etc.) manufactures of components has become the hot spot of research, push the development of micro EDM.
Micro EDM has many advantages, such as low stress, impulse- free robustness, processable high hardness material, in micro processing field
In be widely adopted, have become one important developing direction of micro processing field.
Existing 5-shaft linkage numerical control lathe mainly has: overhead five-shaft linkage machine tool, five-axle linkage ULTRASONIC COMPLEX electrical fire
Spend micro- retrofit numerically-controlled machine tool.Overhead five-shaft linkage machine tool is more mature, but structure is complex, it is difficult to realize complicated bent
Face processing, difficult-to-machine material processing either curved surface low stress shell processing;Five-axle linkage ULTRASONIC COMPLEX electric spark is micro- finely to be added
Number control machine tool feed direction is stablized, and electrode fine feeding processing on complicated route may be implemented, realize to a certain extent multiple
The processing of miscellaneous Special-Shaped Surface, but whole electric spark machine tool system is huge, manufacturing cost is high to be difficult to be widely popularized.
Summary of the invention
In view of the deficiencies of the prior art, the present invention devises a kind of electrical discharge machining clamp structure with collocation structure,
And provide a kind of curved surface EDM parameter method corresponding with Milling Process parameter established based on neural networks principles.It utilizes
The electrical discharge machining clamp structure with collocation structure of design and the curved surface EDM parameter of foundation and Milling Process parameter pair
The electric machining of more deep camber metal surface may be implemented complicated bent in the repacking of existing five-shaft linkage numerically controlled machine in the method answered
EDM micro elements are carried out on face.This method structure is simple, low in cost, it is easy to accomplish.
The technical scheme adopted by the invention to solve the technical problem is that: first on existing 5-shaft linkage numerical control lathe
Micro EDM cutter is installed;And the collocation structure of micro EDM is designed, the compensation of tool-electrode creep feed
Mechanical device include upper self-clamping module, lower self-clamping module, elongated modules, four part of tool-electrode;Then pass through physical relation
Correspondence obtain Milling Process parameter, spindle power, spindle speed and feed engagement, be obtained by calculation input response ginseng
Under several, the metal removal rate of workpiece to be machined, while using the method for sample difference, it is established by neural networks principles
Corresponding relationship between metal removal rate and electrical parameter, to obtain the corresponding pass between EDM parameter and Milling Process parameter
System.
Of the invention has the advantage that 1) method is simple, easy to accomplish;2) the new micro EDM knife designed
Tool has compensation mechanism, it is ensured that during electric machining, electrode tip is with workpiece surface gap relative distance always
Definite value guarantees electrode tip energy stable discharging, guarantees the steady progress of processing;3) EDM parameter and Milling Process parameter designed
Correspondence algorithm can be considered as the black box between five-shaft linkage numerically controlled machine and micro EDM cutter, filled by this black box
It sets, the Milling Process parameter of input terminal can be directly transmitted in micro EDM Tool Control with EDM parameter
The heart, and then realize the repacking that 5-shaft linkage numerical control Micro Edm Machine Tools are completed on any five-shaft linkage numerically controlled machine.
Detailed description of the invention
Fig. 1 is the schematic diagram that the collocation structure of micro EDM is designed in the present invention, 101- tool electricity as shown in the figure
Self-clamping module under pole, the upper self-clamping module of 102-, 103- elongated modules, 104-;
Fig. 2 is micro EDM cutter spindle master-plan structural blast schematic diagram in the present invention, as shown in the figure
Axis, 204- clip-on cap, 205- cramping body, 206- outside 201- medial axis ring support, 202- coil and jackshaft connector, 203-
Jackshaft, 207- voice coil motor coil;
Fig. 3 is the assembling schematic diagram of micro EDM cutter spindle master-plan structure in the present invention;
Fig. 4 is the corresponding relationship schematic diagram designed between EDM parameter and Milling Process parameter in the present invention;
Fig. 5 is that the neural networks principles figure that relationship is established between EDM parameter and metal removal rate is designed in the present invention.
Fig. 6 is that the present invention is based on the network simulation flow charts that neural network RBF neural network model is established.
Specific embodiment
By taking the five-shaft linkage numerically controlled machine of certain model as an example.Micro EDM is installed in the five-shaft linkage numerically controlled machine
Cutter, due to the loss situation in edm process there are electrode, if wire electrode cannot keep closing with for workpieces processing
The discharging gap of reason, electric machining process can stop because of export license, so needing to design the electrical spark working with collocation structure
Work clamp structure, collocation structure motion principle as shown in Figure 1, the motion process of the wriggling collocation structure include: 1) on clamp
Module (102) unclamps micro tool electrode (101), releases the clamping to micro tool electrode (101);2) elongated modules (103)
Elongation drives micro tool electrode (101) and lower self-clamping module (104) to feed down certain distance;3) self-clamping module (102) on
It clamps micro tool electrode (101);4) self-clamping module (104) unclamps release micro tool electrode (101) under, releases and clamps;5)
Elongated modules (103) backhaul, and lower self-clamping module (104) is driven to retract original position;6) self-clamping module (104) clamps fine again under
Tool-electrode (101).The electrical discharge machining clamp structure with collocation structure designed under this movement mechanism, electrical discharge machining
Inside and outside nested structure is used in tool spindle device, as shown in figure 3, i.e. upper self-clamping module (102) tool-electrode collet is direct
It is nested in lower self-clamping module (104) inside.Inside and outside nested structure explosive view, as shown in Figure 2.Upper clamping device (102) is corresponding
Structure is jackshaft coil (201), and tool-electrode (101) corresponding clip-on cap (204), cramping body (205), jackshaft (206) are stretched
The corresponding coil of long module (103) and jackshaft connector (202), the corresponding external axis (203) of lower self-clamping module (104), voice coil electricity
Machine (207) is mainly that the movement of wire electrode provides control movement.Lower self-clamping module had both been used as one of creep feed device to clamp
Module implementation tool electrode timesharing clamping function, and the precision positioning collet as tool-electrode realize the essence to tool-electrode
Close positioning.Since electric spark has the loss of wire electrode in process, when export license needs to compensate, utilize Fig. 3's
Structure completes electrode creep feed electrode compensation according to the motion mode in Fig. 1.This structure can be ensured entire processed
Cheng Zhong, electrode keep an identical distance with workpieces processing always, are able to achieve the steady progress of electrical discharge machining.
In the five-shaft linkage numerically controlled machine for having installed micro EDM cutter, need to propose a kind of equivalent method,
Enable total Milling Machining that can establish with electrical discharge machining to contact.Principle is as shown in figure 4, be metal removal rate be equivalent relation
Node, respectively using Milling Process parameter as input point, EDM parameter is output point.Form input, Milling Process parameter, metal
Removal amount, EDM parameter, output equivalent model.Wherein from Milling Process parameter, metal removal rate using linear public affairs
Formula derivation, directly by Milling Process parameter (Milling Speed, the cutter number of teeth, working depth, tool radius and its processing thickness)
It calculates metal removal rate (mm3/min), and from metal removal rate, EDM parameter (between current peak, pulsewidth, arteries and veins and its capacitor
Value) sample point interpolation is then carried out using Lagrange and Gauss interpolation function, finally obtain the equivalent result of electrical parameter.
Because EDM parameter and metal removal rate do not have specific derivation of equation relationship, electric machining ginseng cannot be directly established
Several and metal removal magnitude relation.Based on this problem, a kind of curved surface EDM parameter established based on neural networks principles is proposed
Method corresponding with metal removal rate, as shown in figure 5, radial basis function (the radial basis based on new development in recent years
Function, RBF) network constructed the metal removal rate prediction model under different electrical parameter processing, and it is pre- using the model
Metal removal rate has been surveyed, and different machining parameters can have been fitted to the overall merit of metal removal rate, electrical fire in microfabrication
RBF neural in the corresponding relationship of flower electrical parameter and milling parameter, this is a kind of three-layer forward networks.Input layer is by inputting
Node composition, the second layer is hidden layer, and for neuron number depending on the needs of described problem, third layer is output layer, it
The effect of input pattern is made a response.Transformation from input sheaf space to implicit sheaf space is nonlinear, and from hidden layer
Transformation to output sheaf space is linear.The transforming function transformation function of hidden layer neuron is radial basis function, it is a kind of part point
The non-negative nonlinear function of the central point radial symmetric of cloth.The curved surface EDM parameter and metal established based on neural networks principles
The corresponding method of removal amount, concrete methods of realizing is as shown in fig. 6, the process that RBF network model is established mainly includes trained sample
Acquisition originally, the pretreatment of data, the design of network.(1) acquisition of training sample;(2) pretreatment of data;It need to be to sample number
According to being normalized, normalized the purpose is to reduce the training times of network, but for feedforward network, due to interior
Portion does not have feedback layer, can be without normalized.(3) design of network;With peak point current, pulse width, pulse spacing, punching
Oil pressure, electrode sections product, input of 5 factors as model, using metal removal rate as output.(4) it tests and shows survey
Test result is compared with pre- period parameters.Training by neural network to sample, the electric machining after available one group of training
The corresponding relationship chart of parameter and Milling Process parameter.Applied mathematics tool can further verify the data obtained corresponding relationship
Accuracy.
Claims (3)
1. a kind of electrical discharge machining clamp structure with collocation structure, it is characterised in that: clamping device is compensated with wire electrode
Structure uses inside and outside nested structure in main shaft device, i.e., upper self-clamping module tool-electrode collet is directly nested in lower clamping mould
Inside block, lower self-clamping module had both been used as a self-clamping module of creep feed device, implementation tool electrode timesharing clamping function, again
As the precision positioning collet of tool-electrode, the precision positioning to tool-electrode is realized.
2. a kind of clamping device structure of line tracking electric machining with wire electrode collocation structure according to claim 1,
Wriggling is characterized in that: upper and lower two self-clamping module can form relative motion, outer shaft and intermediate spindle in up and down motion direction
Between by upper and lower self-clamping module double bond passing movement, while therebetween can opposite sliding up and down, when main shaft fine motion module
When for compensation for electrode wear, needing to drag self-clamping module and move downward, self-clamping module is oriented to for tool-electrode at present for this,
Upper and lower self-clamping module successively clamps in order and unclamps electrode, and the two cooperation makes electrode creep feed electrode compensation.
3. according to claim 1 with a kind of folder of the line tracking electric machining with wire electrode collocation structure as claimed in claim 2
Apparatus structure is held, using the curved surface EDM parameter method corresponding with Milling Process parameter that neural networks principles are established, foundation
The physical relation and neural networks principles of Milling Process parameter and metal removal rate establish Milling Process and EDM parameter
Equivalent model, in the nerve network system of foundation, input layer is Milling Process parameter, and Milling Process parameter setting is milling speed
Degree, the cutter number of teeth, working depth, tool radius and its processing thickness, output layer EDM parameter are set as current peak, arteries and veins
Between wide, arteries and veins and its capacitance.
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CN102653021A (en) * | 2012-05-07 | 2012-09-05 | 莱芜钢铁集团有限公司 | Milling machine |
RU2489238C1 (en) * | 2011-11-21 | 2013-08-10 | Общество С Ограниченной Ответственностью "Есм" | Device for electrochemical processing by vibratory electrode tool |
CN103551683A (en) * | 2013-11-05 | 2014-02-05 | 常州工学院 | Electrode gap control method and device for numerical control electrolytic machining |
CN206779633U (en) * | 2017-05-16 | 2017-12-22 | 无锡微研股份有限公司 | Automatic filament replacing device based on rotation with Creeping Principle |
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RU2489238C1 (en) * | 2011-11-21 | 2013-08-10 | Общество С Ограниченной Ответственностью "Есм" | Device for electrochemical processing by vibratory electrode tool |
CN102513626A (en) * | 2011-12-23 | 2012-06-27 | 清华大学 | Electrode wire rotation and feeding combined driving spindle mechanism for micro electric discharge machining |
CN102653021A (en) * | 2012-05-07 | 2012-09-05 | 莱芜钢铁集团有限公司 | Milling machine |
CN103551683A (en) * | 2013-11-05 | 2014-02-05 | 常州工学院 | Electrode gap control method and device for numerical control electrolytic machining |
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Application publication date: 20190104 |