CN106363488A - Spindle compound motion parameter selecting method and control device and compound motion system - Google Patents
Spindle compound motion parameter selecting method and control device and compound motion system Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B13/00—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
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Abstract
The invention discloses a spindle compound motion parameter selecting method. The method comprises the steps that analog simulation is conducted on multiple H-Z sharp knife removing functions, and a variation curve of the edge warping residual rate TUR of each H-Z sharp knife removing function along with the grinding head extension rate S is drawn; and according to the variation curve of the edge warping residual rate TUR along with the grinding head extension rate S, the value ranges, reaching the target value of the edge warping residual rate TUR, of the grinding head extension rate S, the grinding head eccentricity rate e and the sharp knife coefficient k are selected to be combined. By means of the method, the work parameters of the H-Z sharp knife removing functions under different work conditions can be determined, the edge removing effect is quantified through the edge warping residual rate TUR, and the edge effect of an optical lens can be effectively restrained as long as the selected parameters meet the target value of the edge warping residual rate TUR. The invention further discloses a parameter selecting control device and a compound motion system based on the method.
Description
Technical Field
The invention relates to the technical field of optical lens processing, in particular to a method for selecting composite motion parameters of a main shaft. Also relates to a control device and a compound motion system based on the compound motion parameter selection method.
Background
In optical lens machining, the surface of the optical lens is generally machined by driving a grinding head through a machining center spindle, and the removal distribution and machining rate of the lens material are quantitatively described by the grinding head through a mathematical function model, which is called a removal function. The theoretical model of the removal function is generally based on the Preston linear assumption. The surface error distribution of the optical lens to be processed is called surface shape error. The actual process of optical lens processing is the process of convolving the face shape error by using the removal function, and the solution of deconvolution is used to obtain the residence time, namely the residence time of the grinding head in each point of the workpiece surface. With the development of Computer technology, the above process can be realized by Computer control, the technology is called as CCOS (Computer controlled optical surface) technology, and the CCOS technology is commonly adopted in modern optical processing. The motion forms of the grinding head are different, and the obtained removal functions are also different. One commonly used removal function at present is a gaussian removal function, which has a good surface convergence effect in optical processing. In order to obtain a Gaussian removal function, the main shaft drives the grinding head to perform horizontal rotation movement to realize the removal function, namely the main shaft is a crank shaft, two ends of the crank shaft are respectively connected with the driving device and the grinding head, and the rotation axis of the main shaft and the central axis of the grinding head are radially offset, so that the horizontal rotation of the grinding head is realized through the rotation of the main shaft.
The existing gaussian removal function faces the edge effect when solving the convergence problem of the edge of the workpiece to be processed: on one hand, when the center of the grinding head is too close to the edge of a workpiece (the extension rate is high), the pressure concentration at the edge can be caused, so that the distribution of a removal function is changed to influence the removal precision, and even the grinding head is overturned; on the contrary, if the extension rate of the grinding head is low, the peak value of the removal function is positioned at the inner side of the workpiece, so that the material removal amount of the edge of the workpiece is obviously low, and the edge warping is generated. For example, when the grinding head moves to the edge of the optical lens, the peak value of the removal function cannot reach the edge of the optical lens, and the center of the grinding head is 100mm away from the edge of the optical lens, so no matter how the operation or control residence time is, considering that the flat rotation of the grinding head at the edge of the optical lens has eccentricity, the edge warping generated because the removal peak value cannot reach the edge always occurs in the range of 90mm, which is the reason of the edge effect generating the "edge warping"; when the size of the grinding disc extending out of the edge of the lens is increased, so that the peak value removal moves towards the edge of the lens, although the width of the area of the raised edge is narrowed, the problem of the raised edge still exists, and the risk that the removal function suddenly changes due to the change of stress can cause the local sudden increase of the removal amount along with the increase of the size of the grinding disc extending out of the edge of the lens is increased, so that the problem of sudden 'edge collapse' is caused. Therefore, the size of the grinding stones protruding beyond the edge of the lens cannot be increased excessively in order to eliminate the edge warp. This results in the edge of the optical lens not being completely convoluted.
In order to solve the problem that the Gaussian removal function cannot be completely convolved at the edge, an H-Z sharp tool removal function is recently disclosed, and the removal function is realized by synthesizing two motions, namely by synthesizing a flat rotation motion and a rotation motion of a grinding head, and on the basis of keeping the advantages of excellent volume removal rate and the like of the flat rotation Gaussian removal function, the peak removal rate of the removal function is moved to the edge of the removal function, so that the peak removal rate can reach the outer edge of an optical lens even if the grinding head does not excessively extend out of the edge of the optical lens, the problem of edge warping is solved while edge collapse is avoided, similar complete convolution convergence at the edge of the optical lens is realized from an algorithm, the inhibition of an edge effect is realized, and the material removal efficiency of the grinding head at the edge of a workpiece is improved. The specific H-Z sharp removal function can be described in the article "research on key technology for improving the processing convergence efficiency of large-aperture optical mirrors". However, when the edge of the optical lens is removed under different working conditions, how to determine the working parameters of the H-Z sharp tool removal function to achieve better removal efficiency becomes a problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the present invention provides a method for selecting a composite motion parameter of a spindle to determine a working parameter of an H-Z sharp removal function under different working conditions, so as to effectively suppress an edge effect of an optical lens.
Another object of the present invention is to provide a control device and a compound motion system based on the compound motion parameter selection method, so as to effectively suppress the edge effect of the optical lens.
In order to achieve the purpose, the invention provides the following technical scheme:
a composite motion parameter selection method for a main shaft comprises the following steps:
respectively carrying out analog simulation on a plurality of H-Z sharp knife removal functions with different grinding head eccentricity ratios e and sharp knife coefficients k, and drawing a curve graph of the edge warping residual rate TUR of each H-Z sharp knife removal function along with the grinding head extension rate S;
selecting the grinding head extension rate S, the grinding head eccentricity ratio e and the value range of the sharp knife coefficient k which reach the target value of the edge-lifting residual rate TUR to be combined according to the change curve graph of the edge-lifting residual rate TUR of the H-Z sharp knife removal function along with the grinding head extension rate S, wherein the edge-lifting residual rate TUR is formed by the edge residual edge-lifting amount A3And the actual edge removal A of the removal function1And obtaining that the sharp knife coefficient k is equal to the ratio of the maximum autorotation angle of the grinding head to 2 pi, the eccentricity ratio e of the grinding head is equal to the ratio of the rotation radius of the flat rotation of the grinding head to the diameter of the grinding head, and the extension rate S of the grinding head is equal to the ratio of the maximum extension length of the grinding head to the maximum polishing diameter of the removal function.
Preferably, in the above method for selecting a composite motion parameter, the edge warping residual rate TUR is determined by the edge residual warping amount a3And the actual edge removal A of the removal function1The method is as follows:
preferably, in the above method for selecting composite motion parameters, the target value of the edge warping residual rate TUR is less than or equal to (15% -20%).
Preferably, in the above method for selecting a composite motion parameter, the target value of the warping residual rate TUR is determined according to a machining condition.
Preferably, in the method for selecting the composite motion parameter, the processing condition includes a workpiece size, a workpiece surface shape error and a process type.
Preferably, in the above method for selecting composite motion parameters, the value range of the tip coefficient k is
Preferably, in the above method for selecting composite motion parameters, the simulation is performed on a plurality of H-Z sharp removal functions having different grinding head eccentricity ratios e and sharp removal coefficients k, and a graph of a change of the edge lifting residual rate TUR of each H-Z sharp removal function along with the grinding head protrusion rate S is drawn as:
and drawing a curve of the change of the edge warping residual rate TUR of the H-Z sharp knife removal function with the same grinding head eccentricity e and different sharp knife coefficients k along with the grinding head protrusion rate S in a curve chart of the change of the edge warping residual rate TUR of the HZ sharp knife removal function along with the grinding head protrusion rate S.
The invention also provides a composite motion parameter selection control device of the main shaft, which comprises the following components:
the simulation unit is used for respectively performing simulation on a plurality of H-Z sharp knife removal functions with different grinding head eccentricity ratios e and sharp knife coefficients k, and drawing a curve graph of the edge warping residual rate TUR of each H-Z sharp knife removal function along with the grinding head extension rate S;
a parameter selection unit, configured to select a value range of the grinding head protrusion rate S, the grinding head eccentricity ratio e, and the sharpening coefficient k that reach a target value of the edge protrusion residual rate TUR to be combined according to a variation curve graph of the edge protrusion residual rate TUR of the H-Z sharp knife removal function along with the grinding head protrusion rate S, where the edge protrusion residual rate TUR is determined by an edge residual edge protrusion amount a3And the actual edge removal A of the removal function1And obtaining that the sharp knife coefficient is equal to the ratio of the maximum self-rotation angle of the grinding head to 2 pi, the eccentricity ratio e of the grinding head is equal to the ratio of the rotation radius of the flat rotation of the grinding head to the diameter of the grinding head, and the extension rate S of the grinding head is equal to the ratio of the maximum extension length of the grinding head to the maximum polishing diameter of the removal function.
The invention also provides a composite motion system of the main shaft, which comprises a main shaft driving device and a composite motion parameter selection control device, wherein the composite motion parameter selection control device is used for selecting the composite motion parameters of the main shaftThe parameter selection control device is connected with the spindle driving device and used for respectively carrying out analog simulation on a plurality of H-Z sharp knife removal functions with different grinding head eccentricity ratios e and sharp knife coefficients k, drawing a curve graph of the edge warping residual rate TUR of each H-Z sharp knife removal function along with the grinding head extension rate S, and selecting the value ranges of the grinding head extension rate S, the grinding head eccentricity ratio e and the sharp knife coefficients k which reach the target value of the edge warping residual rate TUR to be combined according to the curve graph of the edge warping residual rate TUR of the H-Z sharp knife removal function along with the grinding head extension rate S; wherein the edge warping residual rate TUR is determined by the edge residual edge warping amount A3And the actual edge removal A of the removal function1And obtaining that the sharp knife coefficient k is equal to the ratio of the maximum autorotation angle of the grinding head to 2 pi, the eccentricity ratio e of the grinding head is equal to the ratio of the rotation radius of the flat rotation of the grinding head to the diameter of the grinding head, and the extension rate S of the grinding head is equal to the ratio of the maximum extension length of the grinding head to the maximum polishing diameter of the removal function.
Compared with the prior art, the invention has the beneficial effects that:
in the method for selecting the composite motion parameters of the spindle, simulation is respectively carried out on a plurality of H-Z sharp knife removal functions with different grinding head eccentricity ratios and sharp knife coefficients, and a curve graph of the edge warping residual rate of each H-Z sharp knife removal function along with the grinding head extension rate is drawn; and selecting a grinding head extension rate range, a grinding head eccentricity ratio range and a sharp knife coefficient range which reach a target value of the edge lifting residual rate to be combined according to a curve graph of the edge lifting residual rate of the H-Z sharp knife removal function along with the grinding head extension rate change. By the method, the working parameters of the H-Z sharp tool removal function under different working conditions can be determined, the edge removal effect is quantified by the edge warping residual rate, and the edge effect of the optical lens can be effectively inhibited as long as the selected parameters meet the target value of the edge warping residual rate.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a flowchart of a method for selecting a composite motion parameter of a spindle according to an embodiment of the present invention.
Fig. 2 is a schematic diagram illustrating a calculation principle of a warping residual rate in a method for selecting a composite motion parameter of a spindle according to an embodiment of the present invention;
fig. 3 is a graph showing a variation of a warping residual rate with a grinding head protrusion rate according to a method for selecting a composite motion parameter of a spindle according to an embodiment of the present invention;
fig. 4 is a graph showing a variation of the edge warping residual rate with the extension rate of the grinding head in another method for selecting a composite motion parameter of a spindle according to an embodiment of the present invention.
Detailed Description
The core of the invention is to provide a method for selecting the composite motion parameters of the main shaft, which can determine the working parameters of the H-Z sharp tool removal function under different working conditions, thereby effectively inhibiting the edge effect of the optical lens.
The invention also provides a composite motion parameter selection control device and a composite motion system based on the composite motion parameter selection method, which can effectively inhibit the edge effect of the optical lens.
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.
Referring to fig. 1, an embodiment of the present invention provides a method for selecting a composite motion parameter of a spindle, where a working parameter is selected based on an H-Z sharp-knife removal function, the composite motion of the spindle includes a horizontal rotation motion of a grinding head and a rotation motion of the grinding head, and the method for selecting the composite motion parameter includes the following steps:
respectively carrying out simulation on a plurality of H-Z sharp knife removal functions with different grinding head eccentricity ratios e and sharp knife coefficients k, and drawing a curve graph of the edge warping residual rate TUR of each H-Z sharp knife removal function along with the change of the grinding head extension rate S. Each H-Z sharp knife removal function is determined by different grinding head eccentricity ratios e and sharp knife coefficients k, so that different warping residual rates TUR changing curves along with grinding head protruding rates S can be simulated under the condition of each different grinding head eccentricity ratio e and sharp knife coefficient k.
And selecting the value ranges of the grinding head protrusion rate S, the grinding head eccentricity ratio e and the sharp knife coefficient k which reach the target value of the edge protrusion residual rate TUR to be combined according to a curve graph of the edge protrusion residual rate TUR of the H-Z sharp knife removal function along with the grinding head protrusion rate S. The working parameters can be obtained.
Wherein, the edge warping residual rate TUR is determined by the edge residual edge warping amount A3And the actual edge removal A of the removal function1The removal effect can be quantified, and the smaller the warping residual rate TUR is, the more effective the warping inhibition is indicated by the smaller the warping. As shown in fig. 2, with the abrasive tip operating normally, the removal function sweeping a straight line at a uniform velocity across the workpiece, producing a uniform trough-like removal zone, the curve in fig. 2 representing the cross-sectional profile of the hook-like removal zone at the edge of the workpiece, it can be seen that since the abrasive tip extends beyond a portion of the edge of the workpiece, in fig. 2, a portion of the cross-sectional profile of the hook-like removal zone is located beyond the edge, and therefore, a in fig. 21Representing the actual edge removal of the removal function, A2Indicating the amount of overflow removal (not applied to the workpiece) of the overhanging edge of the removal function, a1And A2Is represented by a sum removal letterTotal amount of removal of number theory, A3The amount of edge residual warp (the amount by which the workpiece edge is not removed) is indicated. It is clear from fig. 2 that the peak of the curve on the left side of fig. 2 is in the middle, more symmetrical, a3The area of the part is larger; the peak of the right curve is near the edge, A3The area of the part is smaller, namely the raised edge is smaller.
The sharp knife coefficient k is equal to the ratio of the maximum autorotation angle of the grinding head to 2 pi, the autorotation of the grinding head performs reciprocating autorotation according to a certain period, preferably the autorotation according to a sine period, and the larger the sharp knife coefficient k is, the larger the maximum autorotation angle is, and the faster the autorotation speed is under the same autorotation period.
The grinding head eccentricity ratio e is equal to the ratio of the rotation radius of the grinding head in horizontal rotation to the diameter of the grinding head, the larger the grinding head eccentricity ratio e is, the larger the range of a workpiece to be removed by the grinding head in one horizontal rotation is, and the larger the linear velocity of the grinding head is in the same horizontal rotation period.
The grinding head extension rate S is equal to the ratio of the maximum extension length of the grinding head to the maximum polishing diameter of the removal function, when the center of the grinding head approaches the edge of the workpiece, a part of the grinding head extends out of the edge of the workpiece, the eccentric flat rotation of the grinding head is calculated, the maximum length of the grinding head, which can extend out of the edge of the workpiece, is the maximum extension length of the grinding head, and the maximum polishing diameter of the removal function is the maximum diameter in the theoretical movement range of the removal function. The larger the grinding head extension rate S is, the longer the grinding head extends out of the edge of the workpiece is, and the closer the center of the grinding head is to the edge of the workpiece is.
According to the method, on a curve graph of the change of the edge warping residual rate TUR along with the grinding head extraction rate S drawn by simulation, the sharp knife coefficient k, the grinding head eccentricity ratio e and the grinding head extraction rate S in a proper range can be selected according to a set target value of the edge warping residual rate TUR. As long as the set target value of the warping residual rate TUR is satisfied, the removal function can effectively suppress the edge effect of the workpiece.
As shown in fig. 2, in the present embodiment, the edge warping residual rate TUR is determined by the edge residual warping amount a3And actual edge removal of the removal functionExcept amount A1The method specifically comprises the following steps:
as shown in fig. 1, in the present embodiment, the target value of the warping residual rate TUR depends on the machining condition, and the warping residual amount required to be satisfied is different according to different machining conditions. Preferably, the machining condition comprises a workpiece size, a workpiece surface shape error and a process type. The warped edge of the large-sized workpiece tends to be not easily removed, and therefore, the target value of the warped edge residual rate TUR of the large-sized workpiece may be set to be slightly higher.
In this embodiment, when the target value of the warping residual rate TUR is defined to be less than or equal to (15% to 20%), the edge effect can be well suppressed, and of course, the target value of the warping residual rate TUR can be appropriately changed according to different processing conditions, and more preferably, the target value of the warping residual rate TUR is less than or equal to 15%.
As shown in fig. 3 and 4, in order to facilitate the comparative analysis of the variation curve of the edge lifting residual rate TUR of different H-Z sharp knife removal functions along with the grinding head protrusion rate S, in this embodiment, analog simulation is performed on a plurality of H-Z sharp knife removal functions having different grinding head eccentricity ratios e and sharp knife coefficients k, respectively, and the specific variation curve of the edge lifting residual rate TUR of each H-Z sharp knife removal function along with the grinding head protrusion rate S is drawn as:
and drawing a curve of the change of the edge warping residual rate TUR of a plurality of H-Z sharp knife removal functions with the same grinding head eccentricity ratio e and different sharp knife coefficients k along with the grinding head extraction rate S in a curve chart of the change of the edge warping residual rate TUR of the H-Z sharp knife removal function along with the grinding head extraction rate S. Namely, in a curve chart of the edge warping residual rate TUR along with the grinding head extraction rate S, the grinding head eccentricity ratios e of a plurality of change curves are the same and respectively have different sharp knife coefficients k. As can be seen from fig. 3 and 4, the larger the sharpening coefficient k is, the more favorable the reduction of the warping residual rate TUR is for the same wheelhead eccentricity ratio e, and the larger the wheelhead protrusion rate S is, the more favorable the reduction of the warping residual rate TUR is for the same wheelhead eccentricity ratio e, and as can be seen from a comparison between fig. 3 and 4, the smaller the wheelhead eccentricity ratio e is, the more favorable the reduction of the warping residual rate TUR is for the same wheelhead eccentricity ratio e.
Specifically, when the target value of the lifting residual rate TUR is considered to be less than 15%, the edge effect is well suppressed, and a graph of the lifting residual rate TUR as a function of the grinding head protrusion rate S for two different grinding head eccentricity ratios e is listed below. First, in the case where the grinding stone eccentricity ratio e is 1/10, a simulation result of the material removal amount shown in fig. 3 is obtained, and in fig. 3, when the grinding stone protrusion rate S is 0.1, the edge tool coefficient k is 0.2, which satisfies the target that the edge lifting residual TUR is less than 15%. Secondly, in the case that the grinding wheel eccentricity ratio e is 1/5, the simulation calculation result shown in fig. 4 is obtained, and when the grinding wheel protrusion rate S is 0.05, the sharpening coefficient k is 0.1, which can meet the target that the edge warping residual TUR is less than 15%. If other parameters and the target value of the warping residual rate TUR are adopted, the convergence suppression of the warping residual rate TUR can be realized through the parameter combination of the grinding head extension rate S, the sharp knife coefficient k and the grinding head eccentricity ratio e.
As can be seen from fig. 3 and 4, as the sharpness coefficient k increases in a constant amplitude, the inhibition effect on the edge warping residual rate TUR gradually decreases, and when the sharpness coefficient k increases to a certain value k0And then, the sharp knife coefficient k is continuously increased, the inhibition effect on the edge warping residual rate TUR is almost not changed, and the limit is reached. Coefficient of the nose tool k0Satisfies the formula:namely the value range of the sharp knife coefficient k isAs the sharp knife coefficient k is the ratio of the maximum autorotation angle of the grinding head to 2 pi, the grinding head can rotate at the maximum angle of k0The limit angle is most favorable for suppressing the warping residual rate TUR. The maximum autorotation angle of the grinding head is realized by driving corresponding equipment, when the driving condition of the equipment can meet the condition that the maximum autorotation angle of the grinding head reaches a limit value, the driving condition of the equipment corresponding to the limit value is selected, so that when the working parameters are selected according to a curve graph of the edge warping residual rate TUR along with the variation rate S of the grinding head,only the value ranges of the grinding head eccentricity ratio e and the grinding head extension rate S are selected. And for equipment with the driving condition incapable of reaching the maximum angle limit value of the grinding head autorotation, selecting the value ranges of a sharp knife coefficient k, a grinding head eccentricity ratio e and a grinding head protrusion rate S when selecting the working parameters according to a curve graph of the edge warping residual rate TUR along with the grinding head protrusion rate S under the driving capability of the equipment.
As can be seen from fig. 3 and 4, the eccentricity ratio e of the small grinding head, the extension rate S of the large grinding head, and the coefficient k of the large sharp knife are favorable for reducing the edge warping residual rate TUR, and a better processing effect is obtained. But also has adverse effects on other aspects, as shown in table 1 below, so that the grinding head eccentricity ratio e, the grinding head extension rate S and the sharp knife coefficient k need to be selected in a comprehensive consideration.
TABLE 1 influence of grinding head eccentricity ratio, grinding head extension rate and sharpening factor on other working parameters
Of course, besides the curve drawing modes in fig. 3 and 4, each H-Z sharp removal function can be separately drawn in different change curve graphs, and the ranges of the grinding head eccentricity ratio e, the grinding head protrusion rate S and the sharp coefficient k can be selected according to the target value of the edge warping residual rate TUR.
Based on the method for selecting the composite motion parameter of the main shaft described in the above embodiment, the embodiment of the present invention further provides a device for controlling the selection of the composite motion parameter of the main shaft, which includes an analog simulation unit and a parameter selection unit. Wherein,
the simulation unit is used for respectively performing simulation on a plurality of H-Z sharp knife removal functions with different grinding head eccentricity ratios e and sharp knife coefficients k, and drawing a curve graph of the change of the edge warping residual rate TUR of each H-Z sharp knife removal function along with the grinding head extension rate S;
the parameter selection unit is used for selecting the edge warping residual rate TUR according to the H-Z sharp knife removal function and the extension rate S of the grinding headChanging a curve chart, and selecting a value range of the grinding head extraction rate S, the grinding head eccentricity ratio e and the sharp knife coefficient k which reach the target value of the edge warping residual rate TUR to be combined, wherein the edge warping residual rate TUR is formed by the edge residual edge warping amount A3And the actual edge removal A of the removal function1And obtaining that the sharp knife coefficient k is equal to the ratio of the maximum autorotation angle of the grinding head to 2 pi, the eccentricity ratio e of the grinding head is equal to the ratio of the rotation radius of the flat rotation of the grinding head to the diameter of the grinding head, and the extension rate S of the grinding head is equal to the ratio of the maximum extension length of the grinding head to the maximum polishing diameter of the removal function.
Because the composite motion parameter selection control device adopts the composite motion parameter selection method in the invention, the ranges of the grinding head eccentricity ratio e, the grinding head extension rate S and the sharp knife coefficient k which can reach the target value of the edge-warping residual rate TUR can be selected from a change curve graph of the edge-warping residual rate TUR along with the grinding head extension rate S drawn by the H-Z sharp knife removal function simulation, and the workpiece edge effect is inhibited.
The embodiment of the invention also provides a composite motion system of the main shaft, which comprises a main shaft driving device and a composite motion parameter selection control device, wherein the composite motion parameter selection control device is connected with the main shaft driving device and is used for respectively carrying out analog simulation on a plurality of H-Z sharp knife removal functions with different grinding head eccentricity ratios e and sharp knife coefficients k, drawing a curve graph of the edge warping residual rate TUR of each H-Z sharp knife removal function along with the grinding head stretching rate S, and selecting the value ranges of the grinding head stretching rate S, the grinding head eccentricity ratio e and the sharp knife coefficient k which reach the target value of the edge warping residual rate TUR to be combined according to the curve graph of the edge warping residual rate TUR of the H-Z sharp knife removal function along with the grinding head stretching rate S; wherein, the edge warping residual rate TUR is determined by the edge residual edge warping amount A3And the actual edge removal A of the removal function1And obtaining that the sharp knife coefficient k is equal to the ratio of the maximum autorotation angle of the grinding head to 2 pi, the eccentricity ratio e of the grinding head is equal to the ratio of the rotation radius of the flat rotation of the grinding head to the diameter of the grinding head, and the extension rate S of the grinding head is equal to the ratio of the maximum extension length of the grinding head to the maximum polishing diameter of the removal function.
The composite motion system selects the working parameters capable of effectively inhibiting the warping residual rate TUR under the control action of the composite motion parameter selection control device, the main shaft driving device works according to the working parameters, the polishing of the workpiece is completed, and the edge effect of the workpiece is effectively inhibited.
The embodiments in the present description 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.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A method for selecting composite motion parameters of a main shaft is characterized by comprising the following steps:
respectively carrying out analog simulation on a plurality of H-Z sharp knife removal functions with different grinding head eccentricity ratios e and sharp knife coefficients k, and drawing a curve graph of the edge warping residual rate TUR of each H-Z sharp knife removal function along with the grinding head extension rate S;
selecting the grinding head extension rate S, the grinding head eccentricity ratio e and the sharp knife which reach the target value of the edge-lifting residual rate TUR according to the graph of the change of the edge-lifting residual rate TUR of the H-Z sharp knife removal function along with the grinding head extension rate SCombining the value ranges of the coefficient k, wherein the edge warping residual rate TUR is determined by the edge residual edge warping amount A3And the actual edge removal A of the removal function1And obtaining that the sharp knife coefficient k is equal to the ratio of the maximum autorotation angle of the grinding head to 2 pi, the eccentricity ratio e of the grinding head is equal to the ratio of the rotation radius of the flat rotation of the grinding head to the diameter of the grinding head, and the extension rate S of the grinding head is equal to the ratio of the maximum extension length of the grinding head to the maximum polishing diameter of the removal function.
2. The method of claim 1, wherein the edge warp residual rate TUR is determined by an edge residual edge warp amount A3And the actual edge removal A of the removal function1The method is as follows:
3. the method for selecting composite motion parameters according to claim 2, wherein the target value of the edge warping residual rate TUR is less than or equal to (15% -20%).
4. The method according to claim 1, wherein the target value of the warping residual rate TUR is determined according to a machining condition.
5. The compound motion parameter selection method of claim 4, wherein the machining conditions include workpiece size, workpiece surface shape error, and process type.
6. The method for selecting composite motion parameters of claim 1, wherein the value range of the tip coefficient k is
7. The composite motion parameter selection method according to any one of claims 1 to 6, wherein the simulation is performed on a plurality of H-Z sharp removal functions having different grinding head eccentricity ratios e and sharp removal coefficients k, and a graph of the change of the edge lifting residual rate TUR of each H-Z sharp removal function along with the grinding head protrusion rate S is drawn as follows:
and drawing a curve of the change of the edge warping residual rate TUR of the H-Z sharp knife removal function with the same grinding head eccentricity e and different sharp knife coefficients k along with the grinding head protrusion rate S in a curve chart of the change of the edge warping residual rate TUR of the HZ sharp knife removal function along with the grinding head protrusion rate S.
8. A composite motion parameter selection control device of a spindle is characterized by comprising:
the simulation unit is used for respectively performing simulation on a plurality of H-Z sharp knife removal functions with different grinding head eccentricity ratios e and sharp knife coefficients k, and drawing a curve graph of the edge warping residual rate TUR of each H-Z sharp knife removal function along with the grinding head extension rate S;
a parameter selection unit, configured to select a value range of the grinding head protrusion rate S, the grinding head eccentricity ratio e, and the sharpening coefficient k that reach a target value of the edge protrusion residual rate TUR to be combined according to a variation curve graph of the edge protrusion residual rate TUR of the H-Z sharp knife removal function along with the grinding head protrusion rate S, where the edge protrusion residual rate TUR is determined by an edge residual edge protrusion amount a3And the actual edge removal A of the removal function1And obtaining that the sharp knife coefficient is equal to the ratio of the maximum self-rotation angle of the grinding head to 2 pi, the eccentricity ratio e of the grinding head is equal to the ratio of the rotation radius of the flat rotation of the grinding head to the diameter of the grinding head, and the extension rate S of the grinding head is equal to the ratio of the maximum extension length of the grinding head to the maximum polishing diameter of the removal function.
9. A composite motion system of a main shaft comprises a main shaft driving device and is characterized by also comprising a composite motion parameter selection control device which is connected with the main shaft driving device,the method comprises the steps of respectively carrying out simulation on a plurality of H-Z sharp knife removal functions with different grinding head eccentricity ratios e and sharp knife coefficients k, drawing a graph of change of the edge warping residual rate TUR of each H-Z sharp knife removal function along with the grinding head extension rate S, and selecting a value range of the grinding head extension rate S, the grinding head eccentricity ratio e and the sharp knife coefficient k which reach a target value of the edge warping residual rate TUR to be combined according to the graph of change of the edge warping residual rate TUR of the H-Z sharp knife removal function along with the grinding head extension rate S; wherein the edge warping residual rate TUR is determined by the edge residual edge warping amount A3And the actual edge removal A of the removal function1And obtaining that the sharp knife coefficient k is equal to the ratio of the maximum autorotation angle of the grinding head to 2 pi, the eccentricity ratio e of the grinding head is equal to the ratio of the rotation radius of the flat rotation of the grinding head to the diameter of the grinding head, and the extension rate S of the grinding head is equal to the ratio of the maximum extension length of the grinding head to the maximum polishing diameter of the removal function.
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| CN201610991705.3A CN106363488B (en) | 2016-11-10 | 2016-11-10 | Compound motion parameter selection method, control device and the compound motion system of main shaft |
| PCT/CN2017/079269 WO2018086302A1 (en) | 2016-11-10 | 2017-04-01 | Spindle compound motion parameter selecting method and control device, and compound motion system |
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Cited By (2)
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| CN106914796A (en) * | 2017-04-14 | 2017-07-04 | 中国科学院长春光学精密机械与物理研究所 | Main shaft compound motion control method and main shaft control system of composite motion |
| WO2018086302A1 (en) * | 2016-11-10 | 2018-05-17 | 中国科学院长春光学精密机械与物理研究所 | Spindle compound motion parameter selecting method and control device, and compound motion system |
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| CN112171386B (en) * | 2020-09-24 | 2022-04-05 | 恒迈光学精密机械(杭州)有限公司 | Polishing force adjusting and shape modifying method based on robot polishing system |
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| WO2018086302A1 (en) | 2018-05-17 |
| CN106363488B (en) | 2017-12-15 |
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