CN115711581A - Injection molding product size detection method - Google Patents
Injection molding product size detection method Download PDFInfo
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Abstract
The invention provides a method for detecting the size of an injection product, which comprises the following steps: 1) Determining a measurement reference point, and establishing a three-dimensional coordinate system according to the measurement reference point; 2) Converting the two-dimensional coordinates of all point positions of the product on the drawing into three-dimensional coordinates under the three-dimensional coordinate system, and taking the three-dimensional coordinates as theoretical three-dimensional coordinate values; 3) Size detection, including fixed point position detection and fixed dimension offset point finding detection; 4) Comparing the actual measurement value of the fixed point location and the actual measurement value of the point location to be measured in the step 3) with the corresponding theoretical coordinate values respectively so as to respectively obtain the warping deformation condition of the product and the deformation condition on a certain dimension; 5) And finishing the measurement. By the injection product size detection method, double judgment of product warping deformation and deformation in a certain dimension can be automatically completed by matching with an automatic measurement device, and the detection efficiency and the detection accuracy are high.
Description
Technical Field
The invention belongs to the technical field of injection molding product detection, and particularly relates to a method for detecting the size of an injection molding product.
Background
In injection molding production, the size of a molded product is usually detected to compare the actual size of the product with the theoretical size in design, so as to determine whether the product is deformed or whether the dimension of each dimension is deviated during injection molding, and if the deformation or the dimension deviation exceeds an error range, injection molding process adjustment or mold adjustment needs to be correspondingly performed.
In the prior art, the size of the injection molding product is generally detected in the following way:
1. the plastic product is clamped in the checking fixture, and the required position is tested, so that the deformation and the size are confirmed, the detection result is accurate, the checking fixture of the injection molding product is expensive, different plastic products correspond to different checking fixtures and cannot be used universally, and the price of a newly manufactured set of checking fixture is possibly tens of thousands to hundreds of thousands, so that the detection cost is high;
2. the length detection is usually carried out by manually holding a caliper, but the accuracy of a test result is poor due to subjective reasons of manual detection;
3. the three-coordinate measuring machine is adopted for detection, but the three-coordinate detection can only test some test problems which are tested for many times, can not automatically search offset points according to actual measurement results, needs workers to assist in offset point search, and also has the problem of low detection efficiency.
The above information disclosed in this background section is only for enhancement of understanding of the background section of the application and therefore it may contain prior art that does not constitute known technology to those of ordinary skill in the art.
Disclosure of Invention
The invention provides a method for detecting the size of an injection product, which can solve the problems of high detection cost and poor universality of the injection product size detection by adopting a related detection device in the prior art and the problem of low detection precision of manual detection.
In order to realize the purpose of the invention, the invention is realized by adopting the following technical scheme: a dimension detection method for an injection molding product is characterized by comprising the following steps:
1) Determining a measuring reference point, establishing a three-dimensional coordinate system according to the measuring reference point, and taking the measuring reference point as a coordinate origin in an establishing mode;
2) Positioning the product under the three-dimensional coordinate system, and converting the two-dimensional coordinates of all point positions of the product on the drawing into three-dimensional coordinates under the three-dimensional coordinate system to be used as theoretical three-dimensional coordinate values;
3) Size detection, which comprises fixed point position detection and fixed dimension offset point finding detection;
the detection method for detecting the fixed point position comprises the following steps: the automatic measuring device directly measures the three-dimensional coordinate value of the fixed point position on the product;
the detection method for fixed dimension offset point finding detection comprises the following steps: taking the point position with the largest coordinate value of any dimensionality in the theoretical three-dimensional coordinate values of all the point positions as a point position to be measured, and measuring the coordinate value of the point position to be measured on the dimensionality by an automatic measuring device;
4) Comparing the actual measurement value of the fixed point location and the actual measurement value of the point location to be measured in the step 3) with the corresponding theoretical coordinate values respectively so as to respectively obtain the warping deformation condition of the product and the deformation condition on a certain dimension;
5) And finishing the measurement.
The invention also has the following additional technical features:
the method for determining the measurement reference point in the step 1) comprises the following steps: the method comprises the following steps of arranging a rectangular base platform on a workbench of an automatic measuring device, fixedly arranging two rectangular positioning strips which are perpendicular to each other on the top surface of the rectangular base platform, wherein the two rectangular positioning strips are parallel to a group of adjacent sides of the top surface of the rectangular base platform respectively, the intersection point of the length directions of the two rectangular positioning strips is a measuring reference point, the length directions of the two rectangular positioning strips are respectively the X-axis direction and the Y-axis direction of a three-dimensional coordinate system, the direction which passes through the measuring reference point and is perpendicular to the X-axis and the Y-axis is the Z-axis direction, and positioning a product on the rectangular base platform.
And the product is arranged on the rectangular base platform according to the arrangement direction on the drawing and is abutted against the two rectangular positioning strips.
And a pressure device is used for applying pressure to the product to enable the product to abut against the two rectangular positioning strips, and a pressure sensor is arranged on the product and used for preventing the product from deforming due to overlarge pressure.
The method for converting the two-dimensional coordinates of all point positions of the product on the drawing into the three-dimensional coordinates under the three-dimensional coordinate system in the step 2) comprises the following steps: determining the three-dimensional coordinate values of all point positions on the product on the drawing by combining all views on the drawing, and respectively using the three-dimensional coordinate values of all point positions on the drawing as (X) 1 ,Y 1 ,Z 1 ）、（X 2 ,Y 2 ,Z 2 ）……（X n ,Y n ,Z n ) Representing, n is the number of point positions; under the three-dimensional coordinate system, the coordinates of the measuring reference points are (0, 0), the difference value of the original points on the drawing and the measuring reference points in the three-dimensional direction is (a, b, c), and the coordinate values of the points under the three-dimensional coordinate system are respectively (X) 1 +a,Y 1 +b,Z 1 +c）、（X 2 +a,Y 2 +b,Z 2 +c）……（X n +a,Y n +b,Z n +c）。
In step 4), if the product is deformed in a certain dimension, obtaining a scaling ratio K according to a ratio of an actual dimension of the product to a standard dimension in the dimension, carrying out scaling offset on theoretical three-dimensional coordinate values of all the fixed point positions according to the scaling ratio K based on the scaling ratio K, and then carrying out fixed point position detection again to obtain an actual warping deformation condition of the product.
If the scaling ratio K is larger than 1.01, the injection product size detection method further comprises a step of adjusting the mold, wherein the step of adjusting the mold specifically comprises the following steps: defining the theoretical three-dimensional coordinate value before the point location to be detected is zoomed as (X) n ,Y n ,Z n ) And n is the number of point positions, based on the scaling ratio K, the three-dimensional coordinate value (KX) of the point position to be detected after corresponding scaling is obtained n ,KY n ,KZ n ) Defining the three-dimensional coordinate value of the point location to be measured which is actually measured as (A) n ,B n ,C n ) The deformation amount of the product is (A) n -KX n ，B n -KY n ，C n -KZ n ) Then, the scaling value converted into the scaling value in the direction of the corresponding point X on the mold is L1= (A) n -KX n ）/X n The scaling value in the Y direction is L2= (B) n -KY n ）/Y n The scaling value in the Z direction is L3= (C) n -KZ n ）/Z n If the scaling values of all point locations corresponding to all point locations to be measured on the mold in the X direction, the Y direction and the Z direction are in normal distribution in at least one direction, adjusting the mold cavity according to the scaling values in all the directions.
If the scaling values of all the point locations corresponding to all the point locations to be measured on the die in the X direction, the Y direction and the Z direction are not normally distributed, the point locations with the scaling values in the similar proportion are arranged, so that the trend confirmation of the change size is completed, and whether the adjustment of the die is passed or not is judged.
And if the scaling K is less than or equal to 1.01, adjusting the injection molding process.
The automatic measuring device is a three-coordinate measuring machine or a blue light scanner.
Compared with the prior art, the invention has the advantages and positive effects that:
1. according to the injection molding product size detection method, the double judgment of the product warping deformation and the deformation on a certain dimension can be automatically completed by matching with an automatic measurement device, the detection efficiency is high, the detection accuracy is high, and compared with the detection method adopting a special detection tool in the prior art, the detection method has the advantages of high universality and low detection cost;
2. the injection molding product size detection method can realize automatic offset point finding measurement, saves labor, and is favorable for improving detection efficiency and detection accuracy.
Other features and advantages of the present invention will become more apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flowchart of a method for detecting the dimension of an injection molded product according to an embodiment of the present invention;
FIG. 2 is a perspective view of a rectangular base platform according to an embodiment of the present invention;
FIG. 3 is a schematic view of a positioning structure of a product on a rectangular base platform according to an embodiment of the present invention;
FIG. 4 is a dimension diagram of a product in X and Z directions on a drawing sheet according to an embodiment of the present invention;
FIG. 5 is a dimension view in the Z and Y directions of a product on a drawing sheet according to an embodiment of the present invention;
FIG. 6 is a three-dimensional coordinate value of each point on the drawings obtained according to FIGS. 4 and 5.
Reference numerals:
1. a rectangular base platform; 2. a rectangular positioning strip; 3. and (5) producing the product.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all embodiments of the present invention. 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.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring to fig. 1, the present embodiment provides a method for detecting a size of an injection molding product, including the following steps:
1) Determining a measurement reference point O, and establishing a three-dimensional coordinate system according to the measurement reference point O in a way of taking the measurement reference point O as a coordinate origin;
2) Positioning the product under the three-dimensional coordinate system, and converting the two-dimensional coordinates of all point positions of the product on the drawing into three-dimensional coordinates under the three-dimensional coordinate system to be used as theoretical three-dimensional coordinate values;
3) Size detection, which comprises fixed point position detection and fixed dimension offset point finding detection;
the detection method for the fixed point location detection comprises the following steps: the automatic measuring device directly measures the three-dimensional coordinate value of the fixed point position on the product;
the detection method for fixed dimension offset point finding detection comprises the following steps: taking the point position with the largest coordinate value of any dimensionality in the theoretical three-dimensional coordinate values of all the point positions as a point position to be measured, and measuring the coordinate value of the point position to be measured on the dimensionality by an automatic measuring device;
4) Comparing the actual measurement value of the fixed point location and the actual measurement value of the point location to be measured in the step 3) with the corresponding theoretical coordinate values respectively so as to respectively obtain the warping deformation condition of the product and the deformation condition on a certain dimension;
5) And finishing the measurement.
The fixed point location detection is mainly used for judging the buckling deformation condition of the product, the position of each fixed point location is set by a manufacturer, the corresponding theoretical three-dimensional coordinate value is input into a measuring system of the automatic measuring device, namely the known point location, the automatic measuring device measures according to the known point location coordinates to obtain the actual three-dimensional coordinate value corresponding to each fixed point location, and the buckling deformation condition of the product is obtained through comparing the actual three-dimensional coordinate value with the theoretical three-dimensional coordinate value. And (4) determining the dimension deviation for point finding detection, namely finding out the point location, wherein the coordinate value of any dimension is the maximum value of the coordinate values of the dimension in all the point locations, and the point location is the point location to be detected. For example, the theoretical three-dimensional coordinates of the point locations 1, 2, 3 and 4 are (X) respectively 1 ,Y 1 ,Z 1 ）、（X 2 ,Y 2 ,Z 2 ）、（X 3 ,Y 3 ,Z 3 ）、（X 4 ,Y 4 ,Z 4 ) Wherein X is 1 Is X 1 、X 2 、X 3 、X 4 If the maximum value is the maximum value, selecting point 1 as a point to be measured; if Y is 2 Is Y 1 、Y 2 、Y 3 、Y 4 Selecting point 2 as a point to be measured if the maximum value is middle; if Z is 4 Is Z 1 、Z 2 、Z 3 、Z 4 If the maximum value is the maximum value, selecting point 4 as a point to be measured, and then totally obtaining 3 points to be measured, namely point 1, point 2 and point 4; when point 1 is measured, the automatic measuring device keeps the measurementThe position of the end is fixed on two coordinate axes of Y and Z, and the end only moves on the X axis to measure so as to obtain the actual X coordinate value of the point 1; similarly, when the point location 2 is measured, the automatic measuring device keeps the position of the measuring end of the automatic measuring device immovable on two coordinate axes of X and Z and only moves on the axis Y to measure so as to obtain the actual Y coordinate value of the point location 2; when point location 4 is measured, the automatic measuring device keeps the position of the measuring end of the automatic measuring device on the X coordinate axis and the Y coordinate axis still, and only moves on the Z axis to measure, so that the actual Z coordinate value of point location 4 is obtained.
Specifically, a measurement reference point O is an absolute zero point of the established three-dimensional coordinate system, which is set to (0, 0) in a measurement system of the automatic measurement device, and measurement is triggered from the measurement reference point O, a two-dimensional coordinate is a coordinate value displayed on a product drawing, for example, a point coordinate in a front view represents a length and a height, a point coordinate in a side view represents a width and a height, a point coordinate in a top view represents a length and a width, three dimensions of the length, the width and the height are taken as a coordinate axis, and coordinates of each point on the product can be represented by a three-dimensional array, i.e., three-dimensional coordinates in combination with each view.
Further, the method for determining the measurement reference point O in step 1) comprises: a rectangular base platform 1 is provided, and referring to fig. 2, the rectangular base platform 1 is disposed on a workbench of an automatic measuring device, in this embodiment, the automatic measuring device is a three-coordinate measuring machine, of course, the automatic measuring device may also be a blue light measuring instrument or other photographing measuring devices, and the like, and the specific limitation is not required here. The top surface of the rectangular base platform is fixedly provided with two rectangular positioning strips 2 which are perpendicular to each other, the two rectangular positioning strips 2 are parallel to a group of adjacent sides of the top surface of the rectangular base platform respectively, the intersection point of the length directions of the two rectangular positioning strips is the measurement reference point O, the length directions of the two rectangular positioning strips 2 are the X-axis direction and the Y-axis direction of a three-dimensional coordinate system respectively, the direction which crosses the measurement reference point O and is perpendicular to the X-axis and the Y-axis is the Z-axis direction, and a product is positioned on the rectangular base platform 1.
For the specific positioning mode of the product, refer to fig. 3, the product 3 is placed on the rectangular base platform 1 according to the placing direction consistent with that on the drawing, and is abutted against the two rectangular positioning strips 2 to position the product 3.
In order to further improve the positioning reliability of the product, a pressure device such as an oil cylinder can be used for applying pressure to the product 3 to be matched with the two rectangular positioning strips 2 to clamp the product, so that the product 3 is stably abutted against the two rectangular positioning strips 2, and meanwhile, a pressure sensor is arranged on the product and used for preventing the product from being deformed due to overlarge pressure. The value of the pressure sensor can be set so that after reaching this pressure, no further pressurization is achieved, confirming entrapment.
The method for converting the two-dimensional coordinates of all point positions of the product on the drawing into the three-dimensional coordinates under the three-dimensional coordinate system in the step 2) comprises the following steps: determining the three-dimensional coordinate values of the point positions on the drawing according to the views on the drawing, and respectively calculating the three-dimensional coordinate values of the point positions on the drawing by using the (X) values 1 ,Y 1 ,Z 1 ）、（X 2 ,Y 2 ,Z 2 ）……（X n ,Y n ,Z n ) Representing, n is the number of point positions; under the three-dimensional coordinate system established by taking the measuring reference point O as the origin, the coordinates of the measuring reference point are (0, 0), the difference value in the three-dimensional direction between the origin on the drawing and the measuring reference point is (a, b, c), and the coordinate values of each point under the three-dimensional coordinate system are respectively (X) 1 +a,Y 1 +b,Z 1 +c）、（X 2 +a,Y 2 +b,Z 2 +c）……（X n +a,Y n +b,Z n +c）。
Specifically, taking the product size shown in fig. 4 and 5 as an example, in fig. 4, the horizontal axis represents the size of the product in the X direction, and the vertical axis represents the size of the product in the Z direction, in this two-dimensional coordinate system, the coordinate values of the RPS1 point location are (1280.69, 391.64), the coordinate values of the RPS2 point location are (1059.63, 436.65), the coordinate values of the RPS3 point location are (1042.60, 457.00), the coordinate values of the RPS4 point location are (1112.00, 392.50), the coordinate values of the RPS5 point location are (979.00, 453.00), and the coordinate values of the RPS6 point location are (1367.00, 386.00). In fig. 5, in which the horizontal axis represents the dimension of the product in the Y direction and the vertical axis represents the dimension of the product in the Z direction, in this two-dimensional coordinate system, the coordinate values of the RPS1 point location are (-729.00, 391.64), the coordinate values of the RPS2 point location are (-728.00, 436.65), the coordinate values of the RPS3 point location are (-760.20, 457.00), the coordinate values of the RPS4 point location are (-733.50, 392.50), the coordinate values of the RPS5 point location are (-745.90, 453.00), and the coordinate values of the RPS6 point location are (-726.20, 386.00).
According to the above two-dimensional coordinate values, three-dimensional coordinate values of each point location of the product on the drawing can be obtained, as shown in fig. 6, that is, the three-dimensional coordinate values of the RPS1 point location on the drawing are (1280.69, -729.00, 391.64), the coordinate values of the RPS2 point location are (1059.63, -728.00, 436.65), the coordinate values of the RPS3 point location are (1042.60, -760.20, 457.00), the coordinate values of the RPS4 point location are (1112.00, -733.50, 392.50), the coordinate values of the RPS5 point location are (979.00, -745.90, 453.00), and the coordinate values of the RPS6 point location are (1367.00, -726.20, 386.00).
Correspondingly, under a three-dimensional coordinate system established by taking the measurement reference point O as an origin, the theoretical three-dimensional coordinate value of the RPS1 point position is (1280.69 + a, -729.00+ b,391.64+ c), the coordinate value of the RPS2 point position is (1059.63 + a, -728.00+ b,436.65+ c), the coordinate value of the RPS3 point position is (1042.60 + a, -760.20+ b,457.00+ c), the coordinate value of the RPS4 point position is (1112.00 + a, -733.50+ b,392.50+ c), the coordinate value of the RPS5 point position is (979.00 + a, -745.90+ b,453.00+ c), and the coordinate value of the RPS6 point position is (1367.00 + a, -726.20+ b,386.00+ c).
In the step 4), if the product is deformed in a certain dimension, obtaining a scaling ratio K according to a ratio of an actual dimension of the product in the dimension to a standard dimension, based on the scaling ratio K, performing scaling offset on theoretical three-dimensional coordinate values of all fixed point locations in the step 4) according to the scaling ratio K, and then performing fixed point location detection again to obtain an actual warping deformation condition of the product.
Specifically, taking a cambered surface product as an example, the length standard size, namely the size on the drawing, of the cambered surface product is 100mm, the actual length size during actual testing is 110mm, at this time, the cambered surface product is fixed through coordinate axes in the width and height directions, the measuring end of the automatic measuring device only shifts on the coordinate axis where the length is located, the actual length size of the product is 110mm, it is confirmed that the product is deformed, namely, the point where the length size is maximum shifts by 0.1 times of the length standard size, namely, by 10mm, and the position on the product corresponding to the fixed point position set in the measuring system of the automatic measuring device shifts. At this time, in order to ensure the measurement accuracy, the coordinate values of all fixed point locations should be shifted correspondingly during actual measurement, and the offset is enlarged to 1.1 times of the original value to be adjusted. For example, the coordinate values of the originally detected fixed point positions are (10, 12, 24), and the fixed point positions should be shifted to (11, 13.2, 26.2), and after all the fixed point positions are shifted, the warping deformation is detected again, so that the accuracy of the warping deformation detection is improved.
Further, if the scaling ratio K is greater than 1.01, that is, the variation value is large, the size of the mold needs to be adjusted correspondingly to enable the injection-molded product to meet the size requirement, that is, the method for detecting the size of the injection-molded product of the embodiment further includes a step of adjusting the mold.
The steps of adjusting the mould are as follows: defining the theoretical three-dimensional coordinate value (X) before the point location to be measured is zoomed n ,Y n ,Z n ) And n is the number of point positions, based on the scaling ratio K, the scaled three-dimensional coordinate value of the point position to be measured is known as (KX) n ,KY n ,KZ n ) Defining the three-dimensional coordinate value of the point to be measured actually as (A) n ,B n ,C n ) The deformation amount of the product is (A) n -KX n ，B n -KY n ，C n -KZ n ) Then, the scaling value in the X direction corresponding to the point on the mold is converted to L1= (a) n -KX n ）/X n The scaling value in the Y direction is L2= (B) n -KY n ）/Y n The scaling value in the Z direction is L3= (C) n -KZ n ）/Z n If the scaling values of all point locations corresponding to all point locations to be measured on the mold in the X direction, the Y direction and the Z direction are normally distributed, namely the scaling values change near a certain numerical value instead of being irregularly ignored, the deformation of a product caused by the structure of the mold can be judged, and the mold cavity of the mold is adjusted according to the scaling values in all directions.
Specifically, for example, for a certain point to be measured, the actually measured Z-direction coordinate value of the point is smaller than the Z-direction theoretical coordinate value, the Z-direction dimension of the product needs to be increased, that is, the Z-direction dimension of the mold cavity needs to be increased, for example, a part of the mold cavity is milled upwards, that is, iron is reduced; if the actually measured Z-direction coordinate value of the point location to be measured is larger than the Z-direction theoretical coordinate value of the point location to be measured, the Z-direction size of the product needs to be reduced, that is, the Z-direction size of the mold cavity is reduced, for example, a part of the mold cavity is welded upwards, and then the iron adding operation is performed.
If the scaling values of all the point locations corresponding to all the point locations to be measured on the mold in the X direction, the Y direction and the Z direction are not normally distributed, the point locations with the scaling values in the similar proportion are arranged, so that the trend confirmation of the change size is completed, whether the adjustment is carried out through the mold is judged, and whether the adjustment is carried out or not can be judged through the experience of an injection molding process engineer.
If the scaling ratio K is less than or equal to 1.01, it is considered that the scaling ratio is caused by the injection molding process, and the scaling ratio can be fed back to an injection molding process engineer, for example, injection molding pressure adjustment is performed, and the product is shrunk to complete size calibration.
The above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (10)
1. A dimension detection method for an injection molding product is characterized by comprising the following steps:
1) Determining a measuring reference point, establishing a three-dimensional coordinate system according to the measuring reference point, and taking the measuring reference point as a coordinate origin in an establishing mode;
2) Positioning the product under the three-dimensional coordinate system, and converting the two-dimensional coordinates of all point positions of the product on the drawing into three-dimensional coordinates under the three-dimensional coordinate system to be used as theoretical three-dimensional coordinate values;
3) Size detection, which comprises fixed point position detection and fixed dimension offset point finding detection;
the detection method for the fixed point location detection comprises the following steps: the automatic measuring device directly measures the three-dimensional coordinate value of the fixed point position on the product;
the detection method for fixed dimension offset point finding detection comprises the following steps: taking the point location with the maximum coordinate value of any dimensionality in the theoretical three-dimensional coordinate values of all the point locations as a point location to be measured, and measuring the coordinate value of the point location to be measured on the dimensionality by an automatic measuring device;
4) Comparing the actual measurement value of the fixed point location and the actual measurement value of the point location to be measured in the step 3) with the corresponding theoretical coordinate values respectively so as to respectively obtain the warping deformation condition of the product and the deformation condition on a certain dimension;
5) And finishing the measurement.
2. An injection molding product dimension detecting method according to claim 1,
the method for determining the measurement reference point in the step 1) comprises the following steps: a rectangular base platform is arranged on a workbench of an automatic measuring device, two rectangular positioning strips which are perpendicular to each other are fixedly arranged on the top surface of the rectangular base platform, the two rectangular positioning strips are parallel to a group of adjacent sides of the top surface of the rectangular base platform respectively, the intersection point of the length directions of the two rectangular positioning strips is a measuring reference point, the length directions of the two rectangular positioning strips are respectively the X-axis direction and the Y-axis direction of a three-dimensional coordinate system, the direction which passes through the measuring reference point and is perpendicular to the X-axis and the Y-axis is the Z-axis direction, and the product is positioned on the rectangular base platform.
3. A dimension detecting method of an injection molded product according to claim 2,
and the product is arranged on the rectangular base platform according to the arrangement direction on the drawing and is abutted against the two rectangular positioning strips.
4. An injection molding product dimension detecting method according to claim 3,
the product is pressed by a pressure device to abut against the two rectangular positioning strips, and the product is provided with a pressure sensor for preventing the product from deforming due to overlarge pressure.
5. An injection molding product dimension detecting method according to claim 1,
the method for converting the two-dimensional coordinates of all point positions of the product on the drawing into the three-dimensional coordinates under the three-dimensional coordinate system in the step 2) comprises the following steps: determining the three-dimensional coordinate values of the point positions on the drawing according to the views on the drawing, and respectively calculating the three-dimensional coordinate values of the point positions on the drawing by using the (X) values 1 ,Y 1 ,Z 1 ）、（X 2 ,Y 2 ,Z 2 ）……（X n ,Y n ,Z n ) Representing, n is the number of point positions; under the three-dimensional coordinate system, the coordinates of the measuring reference points are (0, 0), the difference value of the original points on the drawing and the measuring reference points in the three-dimensional direction is (a, b, c), and the coordinate values of the points under the three-dimensional coordinate system are respectively (X) 1 +a,Y 1 +b,Z 1 +c）、（X 2 +a,Y 2 +b,Z 2 +c）……（X n +a,Y n +b,Z n +c）。
6. An injection molding product dimension detecting method according to claim 5,
in step 4), if the product is deformed in a certain dimension, obtaining a scaling ratio K according to a ratio of an actual dimension of the product in the dimension to a standard dimension, based on the scaling ratio K, performing scaling offset on theoretical three-dimensional coordinate values of all the fixed point locations according to the scaling ratio K, and then performing fixed point location detection again to obtain an actual warping deformation condition of the product.
7. An injection molding product dimension detecting method according to claim 6,
if the scaling ratio K is larger than 1.01, detecting the size of the injection molding productThe method also comprises a step of adjusting the die, wherein the step of adjusting the die specifically comprises the following steps: defining the theoretical three-dimensional coordinate value before the point location to be detected is zoomed as (X) n ,Y n ,Z n ) And n is the number of point positions, based on the scaling ratio K, the scaled three-dimensional coordinate value of the point position to be measured is known as (KX) n ,KY n ,KZ n ) Defining the three-dimensional coordinate value of the point to be measured which is actually measured as (A) n ,B n ,C n ) The deformation amount of the product is (A) n -KX n ，B n -KY n ，C n -KZ n ) Then, the scaling value in the X direction corresponding to the point on the mold is converted to L1= (a) n -KX n ）/X n The scaling value in the Y direction is L2= (B) n -KY n ）/Y n The zoom value in the Z direction is L3= (C) n -KZ n ）/Z n If the scaling values of all point locations corresponding to all point locations to be measured in the X direction, the Y direction and the Z direction on the mold are in normal distribution in at least one direction, adjusting the mold cavity according to the scaling values in all directions.
8. An injection molding product dimension detecting method according to claim 7,
if the scaling values of all the point locations corresponding to all the point locations to be measured on the die in the X direction, the Y direction and the Z direction are not normally distributed, the point locations with the scaling values in the similar proportion are arranged, so that the trend confirmation of the change size is completed, and whether the adjustment of the die is passed or not is judged.
9. An injection molding product dimension detecting method according to claim 6,
and if the scaling K is less than or equal to 1.01, adjusting the injection molding process.
10. A dimension detecting method of an injection molded product according to claim 1,
the automatic measuring device is a three-coordinate measuring machine or a blue light scanner.
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