CN113500260B - Variable-angular-velocity pulse dynamic electrolytic machining method and system for quickly leveling revolving body - Google Patents
Variable-angular-velocity pulse dynamic electrolytic machining method and system for quickly leveling revolving body Download PDFInfo
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Abstract
The invention relates to a variable-angular-velocity pulse dynamic electrolytic machining method and system for quickly leveling a revolving body. According to the variable angular velocity pulsating state electrolytic machining method for quickly leveling the revolving body, the change value of the angular velocity along with time in the electrolytic machining process can be determined and obtained based on the excircle roundness error of the anode workpiece and the material erosion rate, and then the rotation angular velocities of the anode workpiece and the cathode tool are adjusted in real time according to the change value so as to complete the electrolytic machining process.
Description
Technical Field
The invention relates to the technical field of electrolytic machining, in particular to a variable-angular-velocity pulse dynamic electrolytic machining method and system for quickly leveling a revolving body.
Background
Electrochemical machining is a machining technique that performs material removal by electrochemical anodic dissolution. Compared with the traditional machining mode, the electrochemical machining is non-contact machining, no mechanical cutting force, no cutter loss and no machining residual stress exist in the machining process, and the electrochemical machining has the advantages of wide machining range, high machining efficiency, good machining surface quality and the like. Therefore, the electrolytic machining is suitable for machining thin-wall parts, space complex curved surfaces and high-temperature alloy materials which are difficult to cut.
The casing is a large thin-wall revolving body structure, and the surface of the casing has a concave-convex structure with a complex outline, so that the casing plays roles in supporting a rotor, fixing a stator and protecting a core internal structure. In order to meet the working requirements of high temperature and high pressure, materials such as high temperature alloy, titanium alloy and the like which are difficult to process are mostly adopted. At present, traditional numerical control milling is mainly used for casing parts in actual production, but due to the fact that materials are difficult to machine and the wall thickness is thin, the machining period is long, cutter loss is large, and machining cost is high; meanwhile, in the milling process, due to poor machining performance of the material and residual stress generated in the machining process, the deformation of the casing is serious in the machining process, the uniformity of the wall thickness is poor, and a complex heat treatment process is required to reduce the deformation of the part subsequently. In order to solve the processing problem of the thin-wall case part, Nanjing aerospace university provides a novel aero-engine thin-wall case electrolytic processing method (application number 201410547093.X applicant Nanjing aerospace university, inventor Zhu-Ching-Zhu-Gaiwei-Wang-hongrui-Wang-Yong), and the method (also called as a rotary printing electrolytic processing method) can realize one-time processing and forming of a complex profile by using a single rotary body tool electrode. The method overcomes the problems of large quantity of electrodes, complex processing procedure, easy deformation of processed workpieces and the like of the traditional electrochemical machining tool, and realizes the electrochemical machining of thin-wall revolving body parts with high efficiency, high quality and low cost.
The traditional copy type electrolytic machining adopts a copying block-shaped tool electrode, the tool electrode is meshed with the final part shape, the material erosion rate and the electrode feeding rate are gradually equal along with the continuous feeding of the tool electrode, and the machining gap reaches a balanced state. In the spin-printing electrolytic machining, along with the rotation of the anode workpiece, a material at a certain point of the workpiece is always in a periodic rotating pulse dynamic dissolution state, and due to the existence of the initial roundness error of the anode workpiece, the minimum machining gap of the material at each point on the surface of the anode workpiece in a machining area is inconsistent, the dissolution speed of the surface material of the anode workpiece with a small machining gap is high, and otherwise, the dissolution speed of the surface material of the anode workpiece is low. With the continuous operation of the rotary pulsation electrolytic machining, the outer circle contour of the surface of the anode workpiece is gradually corrected and leveled. In order to improve the stability and the high efficiency of the rotary pulsation electrolytic machining process, the leveling time of the excircle profile of the surface of the anode workpiece needs to be shortened, so that the rotary pulsation electrolytic machining can rapidly enter a stable machining state.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a variable-angular-velocity pulse dynamic electrolytic machining method and system for quickly leveling a revolving body.
In order to achieve the purpose, the invention provides the following scheme:
a variable angular velocity pulsating electrolytic machining method for quickly leveling a revolving body is applied to a pulsating electrolytic machining device in which an anode workpiece and a cathode tool are both revolving bodies; the pulsating electrolytic machining method comprises the following steps:
acquiring the excircle roundness error of the anode workpiece; the excircle roundness error is the difference value between the maximum radius value of the anode workpiece and the minimum radius value of the anode workpiece;
obtaining the material etching rate of the anode workpiece;
after the outer contour of the anode workpiece is evenly divided into n equal parts, determining the angular speed ratio between the angular speed of the highest point of the anode workpiece and the angular speed of the lowest point of the anode workpiece according to the excircle roundness error and the material erosion rate; the highest point of the anode workpiece corresponds to the maximum radius value of the anode workpiece; the lowest point of the anode workpiece corresponds to the minimum radius value of the anode workpiece;
obtaining the change value of the angular velocity of the anode workpiece along with time according to the angular velocity ratio;
determining the rotation angular velocity of the anode workpiece in real time according to the change value of the angular velocity of the anode workpiece along with time so as to finish electrolytic machining; during the pulsating electrolytic machining, the angular velocity of rotation of the cathode tool and the angular velocity of rotation of the anode workpiece are kept equal.
Preferably, the obtaining of the material erosion rate of the anode workpiece further comprises:
obtaining electrolytic machining parameters; the electrochemical machining parameters include: the machining voltage given in the electrolytic machining process, the machining gap in the machining process, the feeding speed of the cathode tool for feeding motion along the direction of the connecting line of the cathode tool and the anode workpiece, and the conductivity of the adopted electrolyte;
determining a material erosion rate of the anode workpiece based on the electrochemical machining parameters.
Preferably, after equally dividing the outer contour of the anode workpiece into n equal parts, determining an angular velocity ratio between the angular velocity of the highest point of the anode workpiece and the angular velocity of the lowest point of the anode workpiece according to the outer circle roundness error and the material erosion rate, specifically comprising:
after the outer contour of the anode workpiece is evenly divided into n equal parts, a relational expression between the angular speed of the highest point of the anode workpiece and the angular speed of the lowest point of the anode workpiece is constructed according to the excircle roundness error and the material erosion rate;
and determining the angular speed ratio between the angular speed of the highest point of the anode workpiece and the angular speed of the lowest point of the anode workpiece according to the relation.
Preferably, the relation is:
in the formula, wlIs the angular velocity, w, of the lowest point of the anode workpiecehIs the angular velocity, delta, of the highest point of the anode workpiece0And v is the material erosion rate.
Preferably, the obtaining of the time-dependent change value of the angular velocity of the anode workpiece according to the angular velocity ratio specifically includes:
determining an angular velocity fluctuation value of the anode workpiece in the process of rotating for one circle according to the angular velocity ratio;
and obtaining the change value of the angular speed of the anode workpiece along with time according to the angular speed fluctuation value.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
according to the variable angular velocity pulsating electrolytic machining method for quickly leveling the revolving body, provided by the invention, the change value of the angular velocity along with time in the electrolytic machining process can be determined and obtained based on the excircle roundness error and the material erosion rate of the anode workpiece, and then the rotation angular velocities of the anode workpiece and the cathode tool are adjusted in real time according to the change value so as to complete the electrolytic machining process, so that the leveling time of the excircle profile of the surface of the anode workpiece is shortened while the stability and the efficiency of the rotary pulsating electrolytic machining process are improved, and the rotary pulsating electrolytic machining is quickly brought into a stable machining state.
Corresponding to the provided variable angular velocity pulsating electrolytic machining method for quickly leveling the revolving body, the invention also provides the following concrete implementation hardware structure:
a variable angular velocity pulsating electrolytic machining system for quickly leveling a revolving body is applied to a pulsating electrolytic machining device with both an anode workpiece and a cathode tool being revolving bodies; the electrolytic processing system includes:
the outer circle roundness error acquisition module is used for acquiring the outer circle roundness error of the anode workpiece; the excircle roundness error is the difference value between the maximum radius value of the anode workpiece and the minimum radius value of the anode workpiece;
the material etching rate acquisition module is used for acquiring the material etching rate of the anode workpiece;
the angular velocity ratio determination module is used for equally dividing the outer contour of the anode workpiece into n equal parts and then determining the angular velocity ratio between the angular velocity of the highest point of the anode workpiece and the angular velocity of the lowest point of the anode workpiece according to the excircle roundness error and the material erosion rate; the highest point of the anode workpiece corresponds to the maximum radius value of the anode workpiece; the lowest point of the anode workpiece corresponds to the minimum radius value of the anode workpiece;
the angular velocity-time change value determining module is used for obtaining the change value of the angular velocity of the anode workpiece along with time according to the angular velocity ratio;
the rotation angular velocity determining module is used for determining the rotation angular velocity of the anode workpiece in real time according to the change value of the angular velocity of the anode workpiece along with time so as to finish electrolytic machining; during the pulsating electrolytic machining, the angular velocity of rotation of the cathode tool and the angular velocity of rotation of the anode workpiece are kept equal.
Preferably, the method further comprises the following steps:
the electrolytic machining parameter acquisition module is used for acquiring electrolytic machining parameters; the electrochemical machining parameters comprise: the machining voltage is given in the electrolytic machining process, the machining gap is formed in the machining process, the feeding speed of the cathode tool in the direction of the connecting line of the cathode tool and the anode workpiece is adopted, and the conductivity of the adopted electrolyte is improved;
a material erosion rate determination module to determine a material erosion rate of the anode workpiece based on the electrochemical machining parameters.
Preferably, the angular velocity ratio determining module specifically includes:
the relational expression determining unit is used for equally dividing the outer contour of the anode workpiece into n equal parts and then constructing a relational expression between the angular speed of the highest point of the anode workpiece and the angular speed of the lowest point of the anode workpiece according to the excircle roundness error and the material erosion rate;
the angular velocity ratio determining unit is used for determining the angular velocity ratio between the angular velocity of the highest point of the anode workpiece and the angular velocity of the lowest point of the anode workpiece according to the relational expression;
preferably, the angular velocity-time change value determination module specifically includes:
the angular velocity fluctuation numerical value determining unit is used for determining an angular velocity fluctuation numerical value in the process that the anode workpiece rotates for one circle according to the angular velocity ratio;
and the angular velocity-time change value determining unit is used for obtaining the change value of the angular velocity of the anode workpiece along with time according to the angular velocity fluctuation value.
The technical effect achieved by the variable angular velocity pulsating electrolytic machining system for quickly leveling the revolving body provided by the invention is the same as the technical effect achieved by the variable angular velocity pulsating electrolytic machining method for quickly leveling the revolving body provided by the invention, so the details are not repeated herein.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a flow chart of a variable angular velocity pulsating electrochemical machining method for rapidly flattening a revolving body provided by the invention;
FIG. 2 is a schematic diagram of an initial state of a rotary pulse dynamic electrochemical machining leveling process according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of angular velocity calculated based on the outer circle profile of the anode workpiece according to an embodiment of the present invention;
FIG. 4 is a schematic view of the rotating pulsating zone from the lowest point to the processing zone in the electrochemical machining process according to the embodiment of the present invention;
FIG. 5 is a schematic diagram illustrating the end of the rotary pulse dynamic electrochemical machining leveling process according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a variable angular velocity pulsating electrochemical machining system for rapidly flattening a revolving body provided by the present invention.
Description of the symbols:
the method comprises the following steps of 1 anode workpiece, 2 cathode tool, 3 electrolytic machining clamp, 4 power supply, 5 machining gap, 200 excircle roundness error acquisition module, 201 material erosion rate acquisition module, 202 speed ratio determination module, 203 angular velocity-time change value determination module and 204 rotation angular velocity determination module.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a variable-angular-velocity pulse dynamic electrolytic machining method and system for quickly leveling a revolving body, which can improve the stability and the high efficiency of a rotary pulse electrolytic machining process, shorten the leveling time of the outer circle profile of the surface of an anode workpiece and quickly enable the rotary pulse electrolytic machining to enter a stable machining state.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1, the variable angular velocity pulsating electrochemical machining method for rapidly leveling a revolving body in a pulsating electrochemical machining apparatus in which an anode workpiece and a cathode tool are both revolving bodies, provided by the invention, comprises the following steps:
step 100: and acquiring the excircle roundness error of the anode workpiece. The excircle roundness error is the difference between the maximum radius value of the anode workpiece and the minimum radius value of the anode workpiece.
Step 101: and acquiring the material etching rate of the anode workpiece. The specific determination process of the material etching rate is as follows:
and acquiring electrochemical machining parameters. The electrochemical machining parameters include: the processing voltage given in the electrolytic processing process, the processing clearance in the processing process, the feeding speed of the cathode tool for feeding motion along the direction of the connecting line of the cathode tool and the anode workpiece, and the conductivity of the adopted electrolyte.
A material erosion rate of the anode workpiece is determined based on the electrochemical machining parameters.
Step 102: and after the outer contour of the anode workpiece is equally divided into n equal parts, determining the angular speed ratio between the angular speed of the highest point of the anode workpiece and the angular speed of the lowest point of the anode workpiece according to the roundness error of the outer circle and the material erosion rate. The highest point of the anode workpiece corresponds to the maximum radius value of the anode workpiece. The lowest point of the anode workpiece corresponds to the minimum radius value of the anode workpiece. Specifically, the method comprises the following steps:
and after the outer contour of the anode workpiece is divided into n equal parts, a relational expression between the angular speed of the highest point of the anode workpiece and the angular speed of the lowest point of the anode workpiece is constructed according to the roundness error of the outer circle and the material erosion rate.
And determining the angular speed ratio between the angular speed of the highest point of the anode workpiece and the angular speed of the lowest point of the anode workpiece according to the relation.
Wherein the relational expression is:
in the formula, wlIs the angular velocity, w, of the lowest point of the anode workpiecehIs the angular velocity, δ, of the highest point of the anode workpiece0And v is the material erosion rate.
Step 103: and obtaining the change value of the angular speed of the anode workpiece along with time according to the angular speed ratio. Specifically, the method comprises the following steps:
and determining the angular velocity fluctuation value of the anode workpiece in the process of rotating for one circle according to the angular velocity ratio.
And obtaining the change value of the angular speed of the anode workpiece along with time according to the angular speed fluctuation value.
Step 104: and determining the rotation angular velocity of the anode workpiece in real time according to the change value of the angular velocity of the anode workpiece along with time so as to finish the electrolytic machining. During the pulsating electrolytic machining, the rotational angular velocity of the cathode tool and the rotational angular velocity of the anode workpiece are kept equal.
Wherein, when the surface material of the anode workpiece is gradually removed and the surface roundness is gradually trimmed, the rotation angular velocity of the anode workpiece can be adjusted to a fixed value.
The following describes the superiority of the variable angular velocity pulsating electrochemical machining method for rapidly leveling a revolving body according to the present invention, taking machining of a casing part as an example.
Fig. 2 shows a structure of a pulsating electrolytic machining apparatus for a rotor used in a process of machining a casing part, which includes: an anode workpiece 1, a cathode tool 2, an electrolytic machining jig 3, a power source 4, and a controller (not shown in the figure). The controller is implanted with the variable angular velocity pulsating electrolytic machining method for quickly leveling the revolving body provided by the invention.
At the beginning of the rotary pulsation electrolytic machining, firstly, detecting the roundness error of the outer circle of the anode workpiece 1 (namely, the roundness error of the outer contour of a casing part), and calibrating the highest point and the lowest point of the outer circle of the anode workpiece 1; the anode workpiece 1 is connected with the anode of the power supply 4, and the cathode tool 2 is connected with the cathode of the power supply 4.
As shown in FIG. 3, in the dynamic electrochemical machining process of the rotary pulse, the excircle profile error of the anode workpiece 1 obtained by combining the theoretical calculation formula and the detection is used to obtain the rotation center O and O of the anode workpiece 1 and the cathode tool 2 around the rotation center O and O1Rotational angular velocity W oftMeanwhile, the cathode tool 2 is fed along the direction of the connecting line of the cathode tool 2 and the anode workpiece 1 at a certain speed f, and the material of the anode workpiece 1 is gradually removed along with the feeding of the cathode tool 2. Wherein, the derivation of the theoretical calculation formula is to artificially assume the highest point and the lowest point of the anode workpiece 1 as short line segments (the contour of the outer circle of the anode workpiece 1 is equally divided into equal parts)And n parts are formed, and the maximum value length and the minimum value length of one part are taken as the length of the line segment represented by the highest point and the lowest point). The derivation process of the theoretical calculation formula can eliminate the initial roundness error of the anode workpiece based on one-circle rotation of the anode workpiece, and can increase the leveling time under the condition of meeting the requirement.
The specific implementation steps of the process are as follows:
in the first step, at the beginning of electrolytic machining, the electrolyte flows through the machining area in the machining gap 5 between the anode workpiece 1 and the cathode tool 2 at a high speed, the machined product is taken away in time, the conductivity of the electrolyte is ensured to be approximately constant, and meanwhile, the electrolytic machining clamp 3 is gradually filled with the electrolyte.
In the second step, the anode workpiece 1 and the cathode tool 2 are rotated at the same angular velocity W during the rotary pulse electrolytic machiningtAround respective centres O and O1Rotating and feeding the cathode tool 2 along the direction of the connecting line of the cathode tool 2 and the anode workpiece 1 at a certain speed f, and continuously and gradually dissolving and removing the material on the surface of the anode workpiece 1 under the electrolysis action.
And thirdly, under the condition of giving the surface material of the anode workpiece 1 in the rotary pulse state of electrolytic machining, under the condition of giving machining voltage, machining gap 5, cathode feeding speed f and electrolyte conductivity, obtaining the material erosion rate v of the material of the anode workpiece 1 in the stable state of rotary pulse dynamic electrolytic machining through finite element simulation software.
Fourthly, combining the casing blank, namely the initial roundness error delta of the anode workpiece 10The relation of the angular velocities of the highest point and the lowest point of the anode workpiece 1 is indirectly derived by a theoretical formula, as shown in the above formula (1). Thereby obtaining the angular velocity values corresponding to different points on the surface of the anode workpiece 1 in the process of rotating one circle in the rotary pulsation electrolytic machining process based on the relational expression. In one period of the rotation of the anode workpiece 1, the angular velocity changes through two period changes, namely from the highest point to the lowest point, and then from the lowest point to the highest point, so as to achieve the purpose of rapid leveling in the rotary pulsation electrolytic machining process.
And fifthly, controlling the anode workpiece 1 and the cathode tool 2 to rotate by using the controller according to the determined angular velocity value so as to finish the electrolytic machining of the casing part.
As shown in fig. 4, when the anode workpiece 1 rotates from the initial state, i.e., the highest point thereof in the machining region shown in fig. 2 to the lowest point thereof in the machining region, the angular velocities of the anode workpiece 1 and the cathode tool 2 also increase from the minimum value to the maximum value thereof.
As shown in fig. 5, as the rotary pulsation electrolytic machining continues, the surface material of the anode workpiece 1 is gradually removed and the surface roundness is gradually corrected, and at this time, the rotation angular velocity can be adjusted to a fixed value, so that the stable and efficient operation of the rotary pulsation electrolytic machining can be ensured, and the dimensional accuracy and the shape accuracy of the anode workpiece after the electrolytic machining is finished can be improved.
In conclusion, the variable angular velocity pulsating electrolytic machining method for quickly leveling the revolving body provided by the invention has the beneficial effects that:
(1) according to the method, the change trend of the outer circle profile of the initial anode workpiece is detected, and the roundness error between two points (the highest point and the lowest point) and the erosion speed of the surface material of the anode workpiece under the given rotating pulse state electrolytic machining condition are combined to obtain the angular speed ratio of the anode workpiece to the machining area when the two points rotate, so that the rotating angular speed of the anode workpiece and the cathode tool in the process that the anode workpiece rotates from the highest point to the lowest point in the machining area can be obtained.
(2) In the invention, the change trend of the rotation angular velocity of the anode workpiece and the cathode tool in the rotary pulsation electrolytic machining process can be obtained only by detecting the initial excircle profile error of the anode workpiece, so that the rotary pulsation electrolytic machining can rapidly enter a stable machining process, and the method has good economical efficiency and practical use value for the pulsation electrolytic machining.
In addition, corresponding to the above-mentioned variable angular velocity pulsating electrolytic machining method for rapidly flattening the revolved body, the present invention also provides a variable angular velocity pulsating electrolytic machining system for rapidly flattening the revolved body, which can be applied to a pulsating electrolytic machining apparatus in which both an anode workpiece and a cathode tool are revolved bodies, as shown in fig. 6, the system includes: an outer circular degree error acquisition module 200, a material erosion rate acquisition module 201, a velocity ratio determination module 202, an angular velocity-time variation value determination module 203, and a rotational angular velocity determination module 204.
The outer circle roundness error obtaining module 200 is used for obtaining the outer circle roundness error of the anode workpiece. The excircle roundness error is the difference between the maximum radius value of the anode workpiece and the minimum radius value of the anode workpiece.
The material etching rate acquisition module 201 is used for acquiring the material etching rate of the anode workpiece.
The angular velocity ratio determination module 202 is configured to equally divide the outer contour of the anode workpiece into n equal parts, and then determine an angular velocity ratio between the angular velocity of the highest point of the anode workpiece and the angular velocity of the lowest point of the anode workpiece according to the roundness error of the outer circle and the material erosion rate. The highest point of the anode workpiece corresponds to the maximum radius value of the anode workpiece. The lowest point of the anode workpiece corresponds to the minimum radius value of the anode workpiece.
The angular velocity-time variation value determination module 203 is used for obtaining a variation value of the angular velocity of the anode workpiece along with time according to the angular velocity ratio.
The rotational angular velocity determination module 204 is configured to determine the rotational angular velocity of the anode workpiece in real time according to a time variation of the angular velocity of the anode workpiece, so as to complete the electrochemical machining. During the pulsating electrolytic machining, the rotational angular velocity of the cathode tool and the rotational angular velocity of the anode workpiece are kept equal.
In order to accurately obtain the material erosion rate, the variable angular velocity pulsating electrochemical machining system for rapidly leveling the revolving body, provided by the invention, further comprises: the device comprises an electrolytic machining parameter acquisition module and a material erosion rate determination module.
The electrolytic machining parameter acquisition module is used for acquiring electrolytic machining parameters. The electrochemical machining parameters include: the processing voltage given in the electrolytic processing process, the processing clearance in the processing process, the feeding speed of the cathode tool for feeding motion along the direction of the connecting line of the cathode tool and the anode workpiece, and the conductivity of the adopted electrolyte.
The material erosion rate determination module is configured to determine a material erosion rate of the anode workpiece based on the electrochemical machining parameters.
Further, the angular velocity ratio determining module 202 specifically includes: a relational expression determining unit and an angular velocity ratio determining unit.
The relation determining unit is used for dividing the outer contour of the anode workpiece into n equal parts, and then establishing a relation between the angular speed of the highest point of the anode workpiece and the angular speed of the lowest point of the anode workpiece according to the excircle roundness error and the material erosion rate.
The angular velocity ratio determining unit is used for determining the angular velocity ratio between the angular velocity of the highest point of the anode workpiece and the angular velocity of the lowest point of the anode workpiece according to the relational expression.
Further, the angular velocity-time variation value determining module 203 specifically includes: an angular velocity fluctuation value determination unit and an angular velocity-time change value determination unit.
The angular velocity fluctuation numerical value determination unit is used for determining an angular velocity fluctuation numerical value in the process that the anode workpiece rotates for one circle according to the angular velocity ratio.
The angular velocity-time change value determination unit is used for obtaining a change value of the angular velocity of the anode workpiece along with time according to the angular velocity fluctuation value.
In the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (9)
1. A variable angular velocity pulsating electrolytic machining method for quickly leveling a revolving body is characterized by being applied to a pulsating electrolytic machining device in which an anode workpiece and a cathode tool are revolving bodies; the electrolytic processing method comprises the following steps:
acquiring the excircle roundness error of the anode workpiece; the excircle roundness error is the difference value between the maximum radius value of the anode workpiece and the minimum radius value of the anode workpiece;
obtaining the material etching rate of the anode workpiece;
after the outer contour of the anode workpiece is evenly divided into n equal parts, determining the angular speed ratio between the angular speed of the highest point of the anode workpiece and the angular speed of the lowest point of the anode workpiece according to the roundness error of the outer circle and the material erosion rate; the highest point of the anode workpiece corresponds to the maximum radius value of the anode workpiece; the lowest point of the anode workpiece corresponds to the minimum radius value of the anode workpiece;
obtaining the change value of the angular velocity of the anode workpiece along with time according to the angular velocity ratio;
determining the rotation angular velocity of the anode workpiece in real time according to the change value of the angular velocity of the anode workpiece along with time so as to finish electrolytic machining; during the pulsating electrolytic machining, the angular velocity of rotation of the cathode tool and the angular velocity of rotation of the anode workpiece are kept equal.
2. The variable angular velocity pulsating electrolytic machining method for rapidly leveling bodies of revolution according to claim 1, wherein said obtaining of the material removal rate of the anode workpiece further comprises:
obtaining electrolytic machining parameters; the electrochemical machining parameters include: the machining voltage is given in the electrolytic machining process, the machining gap is formed in the machining process, the feeding speed of the cathode tool in the direction of the connecting line of the cathode tool and the anode workpiece is adopted, and the conductivity of the adopted electrolyte is improved;
determining a material erosion rate of the anode workpiece based on the electrochemical machining parameters.
3. The variable angular velocity pulsating electrolytic machining method for rapidly leveling a revolving body according to claim 1, wherein after the outer contour of the anode workpiece is equally divided into n equal parts, an angular velocity ratio between the angular velocity of the highest point of the anode workpiece and the angular velocity of the lowest point of the anode workpiece is determined according to the excircle roundness error and the material erosion rate, and specifically comprises:
after the outer contour of the anode workpiece is evenly divided into n equal parts, a relational expression between the angular speed of the highest point of the anode workpiece and the angular speed of the lowest point of the anode workpiece is constructed according to the excircle roundness error and the material erosion rate;
and determining the angular speed ratio between the angular speed of the highest point of the anode workpiece and the angular speed of the lowest point of the anode workpiece according to the relation.
4. The variable angular velocity pulsating electrolytic machining method for rapidly leveling a revolving body according to claim 3, wherein the relational expression is:
in the formula, wlIs the angular velocity, w, of the lowest point of the anode workpiecehIs the angular velocity, δ, of the highest point of the anode workpiece0And v is the material erosion rate.
5. The variable angular velocity pulsating electrolytic machining method for rapidly leveling a revolving body according to claim 1, wherein obtaining a time-dependent change value of the angular velocity of the anode workpiece based on the angular velocity ratio specifically comprises:
determining an angular velocity fluctuation value of the anode workpiece in the process of rotating for one circle according to the angular velocity ratio;
and obtaining the change value of the angular speed of the anode workpiece along with time according to the angular speed fluctuation value.
6. A variable angular velocity pulsating electrolytic machining system for quickly leveling a revolving body is characterized by being applied to a pulsating electrolytic machining device in which an anode workpiece and a cathode tool are revolving bodies; the electrolytic processing system includes:
the outer circle roundness error acquisition module is used for acquiring the outer circle roundness error of the anode workpiece; the excircle roundness error is the difference value between the maximum radius value of the anode workpiece and the minimum radius value of the anode workpiece;
the material etching rate acquisition module is used for acquiring the material etching rate of the anode workpiece;
the angular velocity ratio determining module is used for equally dividing the outer contour of the anode workpiece into n equal parts and then determining the angular velocity ratio between the angular velocity of the highest point of the anode workpiece and the angular velocity of the lowest point of the anode workpiece according to the roundness error of the outer circle and the material erosion rate; the highest point of the anode workpiece corresponds to the maximum radius value of the anode workpiece; the lowest point of the anode workpiece corresponds to the minimum radius value of the anode workpiece;
the angular velocity-time change value determining module is used for obtaining the change value of the angular velocity of the anode workpiece along with time according to the angular velocity ratio;
the rotation angular velocity determining module is used for determining the rotation angular velocity of the anode workpiece in real time according to the change value of the angular velocity of the anode workpiece along with time so as to finish electrolytic machining; during the pulsating electrolytic machining, the angular velocity of rotation of the cathode tool and the angular velocity of rotation of the anode workpiece are kept equal.
7. The variable angular velocity pulsating electrolytic machining system for rapid leveling of a revolving body according to claim 6, further comprising:
the electrolytic machining parameter acquisition module is used for acquiring electrolytic machining parameters; the electrochemical machining parameters include: the machining voltage is given in the electrolytic machining process, the machining gap is formed in the machining process, the feeding speed of the cathode tool in the direction of the connecting line of the cathode tool and the anode workpiece is adopted, and the conductivity of the adopted electrolyte is improved;
a material erosion rate determination module to determine a material erosion rate of the anode workpiece based on the electrochemical machining parameters.
8. The variable angular velocity pulsating electrolytic machining system for rapidly leveling bodies of revolution according to claim 6, wherein the velocity ratio determination module specifically comprises:
the relational expression determining unit is used for equally dividing the outer contour of the anode workpiece into n equal parts and then constructing a relational expression between the angular speed of the highest point of the anode workpiece and the angular speed of the lowest point of the anode workpiece according to the excircle roundness error and the material erosion rate;
and the angular velocity ratio determining unit is used for determining the angular velocity ratio between the angular velocity of the highest point of the anode workpiece and the angular velocity of the lowest point of the anode workpiece according to the relational expression.
9. The variable angular velocity pulsating electrolytic machining system for rapidly leveling bodies of revolution according to claim 6, wherein the angular velocity-time variation value determination module specifically includes:
the angular velocity fluctuation numerical value determining unit is used for determining an angular velocity fluctuation numerical value in the process that the anode workpiece rotates for one circle according to the angular velocity ratio;
and the angular velocity-time change value determining unit is used for obtaining the change value of the angular velocity of the anode workpiece along with time according to the angular velocity fluctuation value.
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