CN107391847B - Virtual die matching method based on measurement - Google Patents

Virtual die matching method based on measurement Download PDF

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CN107391847B
CN107391847B CN201710607035.5A CN201710607035A CN107391847B CN 107391847 B CN107391847 B CN 107391847B CN 201710607035 A CN201710607035 A CN 201710607035A CN 107391847 B CN107391847 B CN 107391847B
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die
point
parting surface
male
measurement
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CN107391847A (en
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蔡锐龙
魏杰
梁星星
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Xi'an Jingdiao Software Technology Co ltd
Northwestern Polytechnical University
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Xi'an Jingdiao Software Technology Co ltd
Northwestern Polytechnical University
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/10—Geometric CAD
    • G06F30/17—Mechanical parametric or variational design
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2111/00—Details relating to CAD techniques
    • G06F2111/04—Constraint-based CAD
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
    • G06F2119/18—Manufacturability analysis or optimisation for manufacturability

Abstract

The invention discloses a virtual die matching method based on measurement, and aims to reduce manual steps in a die matching process of a die, quantify the out-of-tolerance of key points of the die matching, guide die repairing and improve the success rate of one-time die matching. The invention is realized by the following technical scheme: 1) reading in a model file and datum plane measurement data to obtain an initial local coordinate system of the male die and the female die, and fitting and assembling a datum plane; 2) performing mode locking analysis, fitting a base quasi plane in a mode locking precision range, and solving a local coordinate system of the male die and the female die; 3) reading in parting surface measurement data, performing parting surface interference analysis within a parting surface precision range, and calculating a difference value to obtain a parting surface out-of-tolerance point; 4) and displaying and outputting the virtual matching result. The invention can guide the die repairing according to the quantized die matching result and improve the die matching efficiency.

Description

Virtual die matching method based on measurement
Technical Field
The invention belongs to the field of mold production, and particularly relates to a virtual mold matching method based on measurement.
Background
The die is a precise tool for manufacturing molded articles, and different dies are composed of different parts and have higher processing requirements. The production process of the die comprises the following steps: the method comprises the processes of die design, numerical control programming, rough machining, heat treatment, finish machining, die matching, polishing and die testing. After the finish machining of the die is completed, the die needs to be matched to check the quality of the die, and the die is repaired according to a die matching result.
Aiming at the virtual assembly of the die, the traditional method is to visually describe and express the assembly evaluation of the product by means of a computer aided design means, provide three-dimensional animation to show the assembly simulation process of the product, effectively verify the correctness and rationality of the assembly process and enable product designers to timely find and eliminate design defects and hidden dangers.
The existing manual die matching method adopts a mode of coating red lead on a female die and a male die, after the male die is contacted with the female die, the processing quality of a die parting surface is checked by observing the red lead coating condition, so that the manual die trimming is carried out, the process is repeatedly carried out, and the die parting surface die matching is finally completed. The method has high dependence on personnel, can not quantify the dispersion, has low success rate of one-time mold matching and low mold matching efficiency.
The measurement techniques commonly used in the manufacturing industry include three-coordinate measuring machine measurement, optical measurement, on-machine measurement, and the like, and the key size data of the product can be obtained according to the selected measurement points. At present, no method for matching molds by using a measurement technology exists.
Disclosure of Invention
The invention aims to provide a virtual die matching method based on measurement aiming at the problems in the prior art, and the method can provide die repairing guidance data, improve the one-time die matching success rate and the die matching efficiency and reduce the dependence on personnel.
In order to achieve the purpose, the technical scheme adopted by the invention comprises the following steps:
1) reading and analyzing the measurement data of the model file and the reference plane to obtain a world coordinate system and initial local coordinate systems of the male die and the female die in the assembly environment, grouping the measurement data of the reference plane, and fitting and assembling the reference plane;
2) grouping the fitted assembly reference planes, sequentially carrying out surface bonding constraint on the assembly reference planes in the group within the mold locking precision, solving and updating a local coordinate system of the male mold, and fitting results of each group to obtain local coordinate systems of the male mold and the female mold;
3) reading in parting surface measurement data of the male die and the female die, performing coordinate conversion on the parting surface measurement data and the detection direction of the male die and the female die according to the solved local coordinate systems of the male die and the female die and the world coordinate system in the assembly environment, converting all measurement points on the male die and the female die into the world coordinate system in the assembly environment, converting a detection direction set on the female die into the world coordinate system in the assembly environment, performing parting surface interference analysis within the precision range of the parting surface, and calculating a difference value to obtain a parting surface out-of-tolerance point;
4) and according to the parting surface super-differential point, performing tree control and graphical display, and outputting a virtual die matching result.
In the step 1), the reference measuring point sets of the male die and the female die are divided into four reference point subsets according to the reference surface of the die, and then each reference point subset is fitted into two assembly reference planes.
In each grouping of the assembly reference planes, the four reference planes of the die are divided into two groups according to diagonal lines, the reference plane of each die corresponds to two assembly reference planes, and the assembly reference planes are grouped according to the grouping of the reference planes of the die.
And 2) firstly fixing the initial local coordinate system of the female die, respectively calculating the local coordinate systems of the male dies after two groups of assembly reference planes are subjected to surface contact contract, fitting the local coordinate systems of the two male dies, and solving the final local coordinate systems of the male die and the female die. In the step 2), firstly, surface fitting constraint is carried out on a first group of paired male and female die assembly reference planes within the die locking precision, a male die local coordinate system is solved and updated, the existing constraint relation is kept in each calculation for solving, and if the solving fails, the virtual die matching process is exited; and solving the local coordinate system of the second group of male dies by the same method.
And 3) in the difference calculation, calculating the difference of the male die measuring point and the female die measuring point in the detection direction point by point, and recording the difference. The step 3) compares the difference value of each point with the parting surface precision in sequence when the parting surface out-of-tolerance point is judged, and is a non-out-of-tolerance point when the absolute value of the difference value is not greater than the parting surface precision; when the absolute value of the difference is greater than the parting surface precision, the point is a super-differential point; if the difference is positive, determining that a gap exists at the measuring point; and if the difference is negative, judging that the measuring point has interference.
Step 4), displaying the virtual die matching result through a drawing and a report, displaying the out-of-tolerance point and the non-out-of-tolerance point in a control and a graphic window in the tree control and graphic display, distinguishing the out-of-tolerance point and the non-out-of-tolerance point by different colors, and displaying the out-of-tolerance value in the tree control; in a virtual die matching result drawing and a report, the drawing shows the out-of-tolerance points and numbers, and the report shows the numbers, the difference values and the out-of-tolerance conditions of all the measuring points of the parting surface.
Compared with the prior art, the invention has the following beneficial effects: the measurement technology and the virtual assembly technology are integrated and applied to the die matching process, and the measurement data and the model file are used for virtual assembly. The virtual die matching method based on measurement automatically calculates through a computer according to a finished die measurement data file and a die model file, wherein the calculation comprises fitting and assembling a datum plane, performing die locking analysis and further calculating a parting surface super-differential point. The invention ensures that the traditional manual red lead coating method is not needed in the die matching process of the die, thereby reducing the manual steps in the die matching process of the die, quantifying the out-of-tolerance of key points of the die matching, guiding die repair, improving the success rate of one-time die matching and improving the die matching efficiency.
Drawings
FIG. 1 is a flow chart of a virtual die matching method of the present invention;
FIG. 2 is a schematic view of a mode-locked analysis operation interface according to the present invention;
FIG. 3 is a schematic diagram showing the distribution of the reference measurement points of the mold of the present invention, wherein 1, 2, 3, and 4 are the reference surfaces of the mold;
FIG. 4 is a schematic view of a reference plane for fitting the present invention;
FIG. 5 is a schematic representation of an operational interface for interference analysis of a parting surface according to the present invention;
FIG. 6 is a schematic diagram of the distribution of key measurement points on the parting surface of the mold of the present invention;
FIG. 7 is a schematic diagram illustrating a control for a matching fruit tree according to the present invention;
FIG. 8 is a schematic diagram of a pattern area display of a match result of the present invention;
FIG. 9 is a schematic diagram of a pattern output of the matching result of the present invention;
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, the virtual mold matching method based on measurement of the present invention comprises the following steps:
1) referring to fig. 2, reading and analyzing a model file and datum plane measurement data, and fitting and assembling a datum plane;
1.1) reading model files of a male die and a female die to obtain a world coordinate system LW and a male die initial local coordinate system LA in an assembly environment0Initial local coordinate system LB of female die0；
1.2) reading in a datum plane measurement data file and mold locking precision TolOChecking the data correctness;
1.3) fitting and assembling the datum plane according to the datum plane measurement data file.
1.3.1) referring to FIG. 3, note that the set of reference-plane measurement points for the punch is
Figure DEST_PATH_GDA0001407102440000041
The reference surface measuring point set of the female die is
Figure DEST_PATH_GDA0001407102440000042
Collecting the reference surface measuring points of the male die and the female die according to the position of the reference surface
Figure DEST_PATH_GDA0001407102440000043
Divided into four groups of reference point subsets
Figure DEST_PATH_GDA0001407102440000044
Figure DEST_PATH_GDA0001407102440000045
Wherein the reference point subset
Figure DEST_PATH_GDA0001407102440000046
Respectively located on four reference surfaces of the male die, the reference surfaces being a subset
Figure DEST_PATH_GDA0001407102440000047
The n is the number of reference measuring points;
1.3.2) see FIG. 4, from the set of fiducials
Figure DEST_PATH_GDA0001407102440000048
Figure DEST_PATH_GDA0001407102440000049
Fitting each reference point set into two assembly reference planes respectively, and recording the fitted assembly reference plane set of the male die into
Figure DEST_PATH_GDA00014071024400000410
Assembly reference plane set of female die
Figure DEST_PATH_GDA00014071024400000411
2) Performing mode locking analysis, namely performing mode locking analysis on the male die and the female die according to the fitted assembly reference plane and the surface-to-surface binding relationship to judge the assembly property of the male die reference plane and the female die reference plane and solve the local coordinate systems LA and LB of the male die and the female die;
2.1) referring to fig. 3 and 4, dividing the reference surfaces 1 and 4 at the diagonal positions into a group, and dividing the reference surfaces 2 and 3 into a group; wherein the assembly reference plane of the reference surface 1 on the male die is PA1、PA2The corresponding assembly reference plane on the concave die is PB1、PB2(ii) a The corresponding assembly reference plane of the reference surface 4 on the male die is PA7、PA8The corresponding assembly reference plane on the concave die is PB7、PB8(ii) a The corresponding fitting assembly reference plane of the reference surface 2 on the male die is PA3、PA4The corresponding fitting assembly reference plane on the concave die is PB3、PB4(ii) a The corresponding fitting assembly reference plane of the reference surface 3 on the male die is PA5、PA6The corresponding fitting assembly reference plane on the concave die is PB5、PB6；
2.2) for the first set of assembly reference planes PA1、PA2、PA7、PA8、PB1、PB2、PB7、PB8Fixing the initial local coordinate system of the female dieLB0Moving the initial local coordinate system LA of the punch0At mold locking accuracy TolOPerforming surface fitting constraint in a tolerance range to obtain a first group of local coordinate systems LA of the male die1Judging the mode locking condition;
2.2.1) assembling the male die with the reference plane PA1Reference plane PB for assembling with female die1Performing surface lamination constraint to obtain a local coordinate system LA of the male die1；
2.2.2) assembling the reference plane PA with male and female dies1、PB1Local coordinate system LA after bonding1、LB0As an initial condition, at the mode-locking accuracy TolOAssembling the male die with the reference plane PA within the tolerance range2Reference plane PB for assembling with female die2Performing surface fitting constraint and updating the local coordinate system LA of the male die1(ii) a If convex and concave die assembly reference plane PA2、 PB2When the fitting fails, the standard surface of the die is considered to be out of tolerance, the calculation is quitted, all subsequent calculations are not carried out, and virtual die matching failure information is prompted; if convex and concave die base assembly reference plane PA2、PB2If the bonding is successful, the PA is continuously performed7And PB7、PA8And PB8Calculating the surface paste;
2.2.3) assembling the reference plane PA with the male and female dies1And PB1、PA2And PB2Local coordinate system LA after bonding1、 LB0As an initial condition, continuously attaching PA7And PB7And updating the local coordinate system LA of the male die1(ii) a If the calculation is failed, the virtual die matching is considered to be failed, and all subsequent calculations are quitted; if the calculation is successful, the PA is continuously carried out8And PB8Calculating the surface paste;
2.2.4) assembling the reference plane PA with the male and female dies1And PB1、PA2And PB2、PA7And PB7Local coordinate system LA after bonding1、LB0As an initial condition, continuously attaching PA8And PB8And updating the local coordinate system LA of the male die1(ii) a If the calculation fails, the virtual die matching is considered to fail, andquitting all subsequent calculations; if the calculation is successful, recording the local coordinate system LA of the male die after the first group of assembly reference planes are attached1；
2.3) carrying out a second set of assembly reference planes PA by the same method3、PA4、PA5、PA6、PB3、PB4、 PB5、PB6Surface-to-surface total calculation of (a) and fixing of the initial local coordinate system LB of the female die0Moving the initial local coordinate system LA of the punch0At mold locking accuracy TolOPerforming surface fitting constraint in a tolerance range, and obtaining a local coordinate system LA of the male die if the solution is successful2(ii) a If the solution fails, the virtual die matching is considered to fail, and all subsequent calculations are quitted;
2.4) fitting the local coordinate system LA of the male die according to the surface-mounted total calculation result of the two groups of assembly reference planes1And LA2Obtaining a local coordinate system LA of the male die after the die locking, and obtaining a local coordinate system LB of the female die as LB0；
3) Reading parting surface measurement data, performing parting surface interference analysis, analyzing the matching condition of the parting surfaces of the male die and the female die, and calculating an over-differential point;
3.1) reading in parting surface measurement data file and parting surface precision Tol with reference to FIG. 5TChecking the data correctness; referring to FIG. 6, the measurement point set of the punch is recorded
Figure DEST_PATH_GDA0001407102440000061
Measuring point set of female die
Figure DEST_PATH_GDA0001407102440000062
Recording the detection direction set at the measuring point of the concave die as
Figure DEST_PATH_GDA0001407102440000063
After the mode locking analysis, the local coordinate systems of the male die and the female die in the assembly environment are respectively LA and LB, and the world coordinate system in the assembly environment is LW;
3.2) placing the measuring point on the punch
Figure DEST_PATH_GDA0001407102440000064
Measuring point on the die
Figure DEST_PATH_GDA0001407102440000065
And a set of probing directions as
Figure DEST_PATH_GDA0001407102440000066
All converted to the world coordinate system LW of the assembly environment;
3.2.1) obtaining a transformation matrix TracA according to a local convex mould coordinate system LA:
Figure DEST_PATH_GDA0001407102440000067
calculation of [ TAjx,TAjy,TAjz,1]T＝TranA*[TAjx,TAjy,TAjz,1]T；
3.2.2) obtaining transformation matrixes TranB and TranVB according to a concave die local coordinate system LB:
Figure DEST_PATH_GDA0001407102440000068
calculating [ TBjx,TBjy,TBjz,1]T＝TranA*[TBjx,TBjy,TBjz,1]T，VBj＝TranVB*VBj；
3.3) calculating the punch measuring point TA in turn from j to 1jFemale die measuring point TBjIn the detection direction VBjDifference delta ofj: calculating vector Vecj＝(TBjx-TAjx,TBjy-TAjy,TBjz-TAjz)TCalculating the difference deltaj＝Vecj·VBjWill deltajIncluding measurement point difference sets
Figure DEST_PATH_GDA0001407102440000069
When j is m, the calculation is finished;
3.4) ergodic Difference
Figure DEST_PATH_GDA00014071024400000610
Comparison
Figure DEST_PATH_GDA00014071024400000611
With a parting plane precision of TolTJudging the die matching condition: if deltaj|≤TolTIf so, the matching of the j key point is successful; if deltaj|＞TolTRepresenting the matching out-of-tolerance at the jth key point; if deltajIf the value is positive, a gap exists at the measuring point; if deltajIf the signal is negative, interference exists at the measuring point;
4) displaying a die matching result and outputting a die matching report;
4.1) referring to fig. 7 and 8, according to the condition of the out-of-tolerance points of the convex and concave dies of the parting surface obtained by the calculation in the previous step, performing tree control and graphical display, wherein the tree control and the graph are respectively divided into the out-of-tolerance points and the non-out-of-tolerance points by colors, and the tree control displays the out-of-tolerance values;
and 4.2) outputting a virtual die matching out-of-tolerance drawing and a result report according to the out-of-tolerance point condition of the convex die and the concave die of the parting surface, wherein the drawing displays the out-of-tolerance point and the serial number, and the report displays the serial number, the difference value and the out-of-tolerance condition of all measuring points of the parting surface, so that the die repair can be guided.
The following table shows the output results of the model matching result report of the invention:
Figure DEST_PATH_GDA0001407102440000071
the invention ensures that the traditional manual red lead coating method is not needed in the die matching process of the die, thereby reducing the manual steps in the die matching process of the die, quantifying the out-of-tolerance of key points of the die matching and improving the one-time die matching success rate and the die matching efficiency.

Claims (5)

1. A virtual mold matching method based on measurement is characterized by comprising the following steps:
1) reading and analyzing the measurement data of the model file and the reference plane to obtain a world coordinate system and initial local coordinate systems of the male die and the female die in the assembly environment, grouping the measurement data of the reference plane, and fitting and assembling the reference plane; dividing the datum plane measurement data into four groups of datum measurement point subsets, and respectively fitting each datum measurement point subset into two assembly datum planes; in the grouping of each assembly reference plane, four reference planes of the die are divided into two groups according to diagonal lines, the reference plane of each die corresponds to two assembly reference planes, and the assembly reference planes are grouped according to the grouping of the reference planes of the die;
2) grouping the fitted assembly reference planes, sequentially carrying out surface bonding constraint on the assembly reference planes in the group within the mold locking precision, solving and updating a local coordinate system of the male mold, and fitting results of each group to obtain local coordinate systems of the male mold and the female mold;
3) reading in parting surface measurement data of the male die and the female die, performing coordinate conversion on the parting surface measurement data and the detection direction of the male die and the female die according to the solved local coordinate systems of the male die and the female die and the world coordinate system in the assembly environment, converting all measurement points on the male die and the female die into the world coordinate system in the assembly environment, converting a detection direction set on the female die into the world coordinate system in the assembly environment, performing parting surface interference analysis within the precision range of the parting surface, and calculating a difference value to obtain a parting surface out-of-tolerance point;
when the parting surface out-of-tolerance point is judged, the difference values of all the points are sequentially compared with the parting surface precision, and when the absolute value of the difference value is not greater than the parting surface precision, the point is a non-out-of-tolerance point; when the absolute value of the difference is greater than the parting surface precision, the point is a super-differential point; if the difference is positive, determining that a gap exists at the measuring point; if the difference is negative, judging that interference exists at the measuring point;
4) and according to the parting surface super-differential point, performing tree control and graphical display, and outputting a virtual die matching result.
2. The measurement-based virtual model matching method according to claim 1, characterized in that: and 2) firstly fixing the initial local coordinate system of the female die, respectively calculating the local coordinate systems of the male dies after two groups of assembly reference planes are subjected to surface contact contract, fitting the local coordinate systems of the two male dies, and solving the final local coordinate systems of the male die and the female die.
3. The virtual mold matching method based on measurement according to claim 1 or 2, wherein the step 2) firstly carries out surface fitting constraint on a first group of paired convex and concave mold assembly reference planes within mold locking precision, solves and updates a local coordinate system of a convex mold, keeps an existing constraint relation for solving in each calculation, and exits the virtual mold matching process if the solving fails; and solving the local coordinate system of the second group of male dies by the same method.
4. The measurement-based virtual model matching method according to claim 1, characterized in that: and 3) in the difference calculation, calculating the difference of the male die measuring point and the female die measuring point in the detection direction point by point, and recording the difference.
5. The measurement-based virtual model matching method according to claim 1, characterized in that: the virtual die matching result of the step 4) is displayed through a drawing and a report, in the process of tree control and graphical display, the out-of-tolerance point and the non-out-of-tolerance point are displayed in a control and a graphical window, and are distinguished by different colors, and the out-of-tolerance value is displayed in the tree control; in a virtual die matching result drawing and a report, the drawing shows the out-of-tolerance points and numbers, and the report shows the numbers, the difference values and the out-of-tolerance conditions of all the measuring points of the parting surface.
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