Method for detecting the size of an injection molded product

Abstract

The application provides a kind of injection molding product size detection method, comprising the following steps: 1) determining the measurement reference point, and establishing three-dimensional coordinate system according to the measurement reference point;2) the two-dimensional coordinates of all point positions of the product on the drawing are converted into three-dimensional coordinates under the three-dimensional coordinate system as the theoretical three-dimensional coordinate values;3) size detection, including fixed point position detection and dimension offset finding point detection;4) the actual measurement values of the fixed point positions and the actual measurement values of the to-be-measured point positions in step 3) are compared with their corresponding theoretical coordinate values respectively to obtain the warping deformation of the product and the deformation in a certain dimension respectively;5) measurement ends.By the injection molding product size detection method of the application, the automatic measurement device can automatically complete the double determination of product warping deformation and deformation in a certain dimension, with high detection efficiency and high detection accuracy.

Description

Technical Field

[0001] This invention belongs to the field of injection molded product testing technology, and specifically relates to a method for testing the dimensions of injection molded products. Background Technology

[0002] In injection molding production, it is usually necessary to check the dimensions of the molded product to compare the actual dimensions with the theoretical dimensions designed in order to determine whether the product has been deformed during injection molding or whether there are deviations in the dimensions of each dimension. If the deformation or dimensional deviation exceeds the error range, the injection molding process or mold needs to be adjusted accordingly.

[0003] In existing technologies, the following methods are typically used for dimensional inspection of injection-molded products:

[0004] 1. Inspection using fixtures involves making corresponding fixtures, placing the plastic product into the fixture and clamping it to perform tests at the required locations, thereby confirming deformation and dimensions. This inspection method yields relatively accurate results. However, fixtures for injection molded products are expensive, and different plastic products require different fixtures, making them non-interchangeable. Making a new set of fixtures can cost anywhere from tens of thousands to hundreds of thousands of yuan, resulting in high inspection costs.

[0005] 2. Length measurement is usually done manually with handheld calipers, but manual measurement can lead to poor accuracy due to subjective factors.

[0006] 3. A coordinate measuring machine (CMM) is used for inspection. However, CMM can only test some test problems that have been tested many times. It cannot automatically find the offset point based on the actual measurement results. It requires the assistance of staff to find the offset point, which also has the problem of low inspection efficiency.

[0007] The information disclosed in this background section is only intended to enhance the understanding of the background technology of this application, and therefore may include prior art that is not known to those skilled in the art. Summary of the Invention

[0008] This invention provides a method for detecting the dimensions of injection molded products, which can solve the problems of high cost and poor versatility of existing detection devices for detecting the dimensions of injection molded products, as well as the low accuracy of manual detection.

[0009] To achieve the above-mentioned objectives, the present invention employs the following technical solution: a method for detecting the dimensions of injection molded products, characterized by comprising the following steps:

[0010] 1) Determine the measurement reference point and establish a three-dimensional coordinate system based on the measurement reference point, using the measurement reference point as the origin of the coordinate system;

[0011] 2) Position the product in this three-dimensional coordinate system, and convert the two-dimensional coordinates of all points of the product on the drawing into three-dimensional coordinates in this three-dimensional coordinate system as theoretical three-dimensional coordinate values;

[0012] 3) Dimensional inspection, which includes fixed-point inspection and fixed-dimensional offset point detection;

[0013] The detection method for the fixed point detection is as follows: the automated measuring device directly measures the three-dimensional coordinate values ​​of the fixed point on the product;

[0014] The detection method for fixed-dimensional offset point finding detection is as follows: the point with the largest coordinate value in any dimension among all theoretical three-dimensional coordinate values ​​is taken as the point to be measured, and the automated measuring device measures the coordinate value of the point to be measured in that dimension.

[0015] 4) Compare the actual measured values ​​of the fixed points and the measured points in step 3) with their corresponding theoretical coordinate values ​​to obtain the warping deformation and deformation in a certain dimension of the product.

[0016] 5) Measurement complete.

[0017] The present invention also has the following additional technical features:

[0018] The method for determining the measurement reference point in step 1) is as follows: A rectangular base platform is placed on the workbench of the automated measuring device. Two rectangular positioning bars are fixed on the top surface of the rectangular base platform and are perpendicular to each other. The two rectangular positioning bars are parallel to a set of adjacent sides of the top surface of the rectangular base platform. The intersection of the length directions of the two rectangular positioning bars is the measurement reference point. The length directions of the two rectangular positioning bars are the X-axis direction and the Y-axis direction of the three-dimensional coordinate system, respectively. The direction passing through the measurement reference point and perpendicular to both the X-axis and the Y-axis is the Z-axis direction. The product is positioned on the rectangular base platform.

[0019] The product is placed on the rectangular base platform according to the orientation shown in the drawings and rests against the two rectangular positioning bars.

[0020] A pressure device applies pressure to the product, causing it to press against the two rectangular positioning bars. The product is equipped with a pressure sensor to prevent excessive pressure from causing product deformation.

[0021] Step 2) involves converting the two-dimensional coordinates of all points on the product in the drawing to three-dimensional coordinates in a three-dimensional coordinate system. The method is as follows: Determine the three-dimensional coordinate values ​​of each point on the product in the drawing by combining the views on the drawing, and then assign the three-dimensional coordinate values ​​of each point to (X1, Y1, Z1), (X2, Y2, Z2), ..., (X... n ,Y n Zn () indicates that n is the number of points; in the three-dimensional coordinate system, the coordinates of the measurement reference point are (0,0,0), and the difference between the origin on the drawing and the measurement reference point in the three-dimensional direction is (a,b,c). Then the coordinate values ​​of each point in the three-dimensional coordinate system are (X1+a,Y1+b,Z1+c), (X2+a,Y2+b,Z2+c)...(X... n +a,Y n +b,Z n +c).

[0022] In step 4), if the product is deformed in a certain dimension, the scaling ratio K is obtained based on the ratio of the actual size of the product to the standard size in that dimension. Based on the scaling ratio K, the theoretical three-dimensional coordinate values ​​of all the fixed points are scaled and offset according to the scaling ratio K, and the fixed point detection is performed again to obtain the actual warping deformation of the product.

[0023] If the scaling ratio K is greater than 1.01, the injection molding product size detection method further includes a mold adjustment step, which specifically involves defining the theoretical three-dimensional coordinates of the point to be measured before scaling as (X... n ,Y n Z n ), where n is the number of points, then based on the scaling ratio K, the scaled three-dimensional coordinates of the point to be measured are obtained as (KX). n ,KY n ,KZ n ), define the three-dimensional coordinates of the measured point as (A) n B n C n Then the deformation of the product is (A) n -KX n B n -KY n C n -KZ n Then, the scaling value in the X direction of the corresponding point 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 points on the mold corresponding to all test points are normally distributed in at least one of the X, Y, and Z directions, then the mold cavity is adjusted according to the scaling values ​​in each of the above directions.

[0024] If the scaling values ​​of all points on the mold corresponding to all test points are not normally distributed in the X, Y, and Z directions, then points with similar scaling ratios will be arranged to confirm the trend of the change and determine whether mold adjustment is necessary.

[0025] If the scaling ratio K is less than or equal to 1.01, adjust the injection molding process.

[0026] The automated measurement device is a coordinate measuring machine or a blue light scanner.

[0027] Compared with the prior art, the advantages and positive effects of the present invention are:

[0028] 1. The injection molding product size detection method of the present invention, combined with an automated measuring device, can automatically complete the dual judgment of product warpage and deformation in a certain dimension. It has high detection efficiency and high detection accuracy. Compared with the use of special inspection tools in the prior art, it has high versatility and low detection cost.

[0029] 2. The injection molding product size detection method of the present invention can realize automatic offset point finding and measurement, save manpower, and help improve detection efficiency and accuracy.

[0030] Other features and advantages of the present invention will become clearer after reading the detailed embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a flowchart of the injection molding product size detection method in an embodiment of the present invention;

[0033] Figure 2 This is a perspective view of the rectangular base platform in an embodiment of the present invention;

[0034] Figure 3 This is a schematic diagram of the positioning structure of the product on the rectangular base platform in an embodiment of the present invention;

[0035] Figure 4 This is a dimensional diagram of the product in the X and Z directions on the drawing in the embodiment of the present invention;

[0036] Figure 5 This is a dimensional diagram of the product in the Z and Y directions on the drawing in the embodiment of the present invention;

[0037] Figure 6 According to Figure 4 and Figure 5 The three-dimensional coordinates of each point on the product on the drawing are shown.

[0038] Figure label:

[0039] 1. Rectangular base platform; 2. Rectangular positioning strip; 3. Product. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] It should be noted that in the description of this invention, terms such as "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," indicating directional or positional relationships, are based on the directional or positional relationships shown in the accompanying drawings. These are merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0042] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0043] Reference Figure 1 This embodiment provides a method for detecting the dimensions of injection molded products, including the following steps:

[0044] 1) Determine the measurement reference point O, and establish a three-dimensional coordinate system based on the measurement reference point O, using the measurement reference point O as the origin of the coordinate system;

[0045] 2) Position the product in this three-dimensional coordinate system, and convert the two-dimensional coordinates of all points of the product on the drawing into three-dimensional coordinates in this three-dimensional coordinate system as theoretical three-dimensional coordinate values;

[0046] 3) Dimensional inspection, which includes fixed-point inspection and fixed-dimensional offset point detection;

[0047] The detection method for the fixed point detection is as follows: the automated measuring device directly measures the three-dimensional coordinate values ​​of the fixed point on the product;

[0048] The detection method for fixed-dimensional offset point finding detection is as follows: the point with the largest coordinate value in any dimension among all theoretical three-dimensional coordinate values ​​is taken as the point to be measured, and the automated measuring device measures the coordinate value of the point to be measured in that dimension.

[0049] 4) Compare the actual measured values ​​of the fixed points and the measured points in step 3) with their corresponding theoretical coordinate values ​​to obtain the warping deformation and deformation in a certain dimension of the product.

[0050] 5) Measurement complete.

[0051] Fixed-point detection is primarily used to determine the warping deformation of the product. The locations of each fixed point are specified by the manufacturer, and their corresponding theoretical three-dimensional coordinate values ​​have been input into the measurement system of the automated measuring device, thus forming known points. The automated measuring device measures these known point coordinates to obtain the actual three-dimensional coordinate values ​​corresponding to each fixed point. By comparing the actual three-dimensional coordinate values ​​with the theoretical three-dimensional coordinate values, the warping deformation of the product can be determined. Dimensional offset detection involves identifying the point among all points where the coordinate value in any dimension is the maximum value among all points in that dimension; this point is the target point for measurement. For example, the theoretical three-dimensional coordinates of points 1, 2, 3, and 4 are (X1, Y1, Z1), (X2, Y2, Z2), (X3, Y3, Z3), and (X4, Y4, Z4), respectively. Where X1 is the maximum value among X1, X2, X3, and X4, then point 1 is selected as a point to be measured. If Y2 is the maximum value among Y1, Y2, Y3, and Y4, then point 2 is selected as a point to be measured. If Z4 is the maximum value among Z1, Z2, Z3, and Z4, then point 4 is selected as a point to be measured. Therefore, there are a total of three points to be measured: point 1, point 2, and point 4. When measuring point 1, the automated measuring device keeps its measuring end stationary on the Y and Z axes and moves only on the X axis to obtain the actual X coordinate value of point 1. Similarly, when measuring point 2, the automated measuring device keeps its measuring end stationary on the X and Z axes and moves only on the Y axis to obtain the actual Y coordinate value of point 2. When measuring point 4, the automated measuring device keeps its measuring end stationary on the X and Y axes and moves only on the Z axis to obtain the actual Z coordinate value of point 4.

[0052] Specifically, the measurement reference point O is the absolute zero point of the established three-dimensional coordinate system, which is defined as (0,0,0) in the measurement system of the automated measuring device. Measurement is triggered from this measurement reference point O. The two-dimensional coordinates are the coordinate values ​​displayed on the product drawings. For example, the coordinates of the points in the front view represent the length and height, the coordinates of the points in the side view represent the width and height, and the coordinates of the points in the top view represent the length and width. By taking the three dimensions of length, width and height as a coordinate axis and combining them with the views, the coordinates of each point on the product can be represented by a three-dimensional array, i.e., three-dimensional coordinates.

[0053] Furthermore, the method for determining the measurement reference point O in step 1) is as follows: A rectangular base platform 1 is set up, referring to... Figure 2The rectangular base platform 1 is placed on the workbench of the automated measuring device. In this embodiment, the automated measuring device is a coordinate measuring machine (CMM). Of course, the automated measuring device can also be a blue light measuring instrument or other photographic measuring device, etc., and there are no specific limitations here. Two rectangular positioning bars 2 are fixedly installed on the top surface of the rectangular base platform. The two rectangular positioning bars 2 are parallel to a set of adjacent sides of the top surface of the rectangular base platform. The intersection of the length directions of the two rectangular positioning bars is the measurement reference point O. The length directions of the two rectangular positioning bars 2 are the X-axis and Y-axis directions of the three-dimensional coordinate system, respectively. The direction passing through the measurement reference point O and perpendicular to both the X-axis and Y-axis is the Z-axis direction. The product is positioned on the rectangular base platform 1.

[0054] For specific product positioning methods, refer to... Figure 3 Following the same orientation as shown in the drawing, place product 3 on the rectangular base platform 1 and abut it against the two rectangular positioning strips 2 to position product 3.

[0055] To further improve product positioning reliability, a pressure device, such as a hydraulic cylinder, can be used to apply pressure to product 3, which, in conjunction with two rectangular positioning bars 2, clamps the product, ensuring that product 3 is securely pressed against the two rectangular positioning bars 2. Simultaneously, a pressure sensor is installed on the product to prevent deformation due to excessive pressure. The pressure sensor value can be set; once this pressure is reached, no further pressure is applied, confirming that the product is clamped.

[0056] The method for converting the two-dimensional coordinates of all points on the product in the drawing to three-dimensional coordinates in the three-dimensional coordinate system in step 2) is as follows: Determine the three-dimensional coordinate values ​​of each point on the product in the drawing by combining the views on the drawing, and assign the three-dimensional coordinate values ​​of each point to (X1, Y1, Z1), (X2, Y2, Z2), ..., (X... n ,Y n Z n () indicates that n is the number of points; in a three-dimensional coordinate system established with the measurement reference point O as the origin, the coordinates of the measurement reference point are (0,0,0). The difference between the origin on the drawing and the measurement reference point in the three-dimensional direction is (a,b,c). Then the coordinates of each point in the three-dimensional coordinate system are (X1+a,Y1+b,Z1+c), (X2+a,Y2+b,Z2+c)...(X... n +a,Y n +b,Z n +c).

[0057] Specifically, with Figure 4 and Figure 5 Taking the product dimensions shown as an example, Figure 4In this two-dimensional coordinate system, the horizontal axis represents the product's dimensions in the X direction, and the vertical axis represents the product's dimensions in the Z direction. The coordinates of point RPS1 are (1280.69, 391.64), point RPS2 are (1059.63, 436.65), point RPS3 are (1042.60, 457.00), point RPS4 are (1112.00, 392.50), point RPS5 are (979.00, 453.00), and point RPS6 are (1367.00, 386.00). Figure 5 In this two-dimensional coordinate system, the horizontal axis represents the product's dimension in the Y direction, and the vertical axis represents the product's dimension in the Z direction. The coordinates of point RPS1 are (-729.00, 391.64), point RPS2 are (-728.00, 436.65), point RPS3 are (-760.20, 457.00), point RPS4 are (-733.50, 392.50), point RPS5 are (-745.90, 453.00), and point RPS6 are (-726.20, 386.00).

[0058] Based on the above two-dimensional coordinate values, the three-dimensional coordinate values ​​of each point on the product on the drawing can be obtained, such as... Figure 6 As shown, the 3D coordinates of point RPS1 on the drawing are (1280.69, -729.00, 391.64), the coordinates of point RPS2 are (1059.63, -728.00, 436.65), the coordinates of point RPS3 are (1042.60, -760.20, 457.00), the coordinates of point RPS4 are (1112.00, -733.50, 392.50), the coordinates of point RPS5 are (979.00, -745.90, 453.00), and the coordinates of point RPS6 are (1367.00, -726.20, 386.00).

[0059] Accordingly, in the three-dimensional coordinate system established with the measurement reference point O as the origin, the theoretical three-dimensional coordinates of point RPS1 are (1280.69+a, -729.00+b, 391.64+c), the coordinates of point RPS2 are (1059.63+a, -728.00+b, 436.65+c), and the coordinates of point RPS3 are (1042.60+a, -760). The coordinates of point RPS4 are (1112.00+a, -733.50+b, 392.50+c), the coordinates of point RPS5 are (979.00+a, -745.90+b, 453.00+c), and the coordinates of point RPS6 are (1367.00+a, -726.20+b, 386.00+c).

[0060] In step 4), if the product is deformed in a certain dimension, the scaling ratio K is obtained based on the ratio of the actual size of the product to the standard size in that dimension. Based on the scaling ratio K, the theoretical three-dimensional coordinate values ​​of all fixed points in step 4) are scaled and offset according to this scaling ratio K, and then the fixed points are re-detected to obtain the actual warping deformation of the product.

[0061] Specifically, taking a curved product as an example, its standard length (as shown on the drawing) is 100mm, while the actual length during testing is 110mm. First, the width and height axes are fixed. The measuring end of the automated measuring device only offsets along the length axis, resulting in an actual length of 110mm. This confirms that the product has deformed; the point with the maximum length has shifted by 0.1 times the standard length, or 10mm. Therefore, the position on the product corresponding to the fixed point set in the automated measuring device's system has shifted. To ensure measurement accuracy, the coordinates of all fixed points should be shifted accordingly, increased to 1.1 times their original value. For example, the original coordinates of the fixed point (10, 12, 24) should be shifted to (11, 13.2, 26.2). After shifting all fixed points, a second warping deformation test is performed to improve the accuracy of the warping deformation detection.

[0062] Furthermore, if the scaling ratio K is greater than 1.01, that is, the change value is large, then the mold size needs to be adjusted accordingly to make the injection molded product meet the size requirements. That is, the injection molded product size detection method in this embodiment also includes the mold adjustment step.

[0063] The specific steps for mold adjustment are as follows: Define the theoretical three-dimensional coordinates of the point to be measured before scaling as (X... n ,Y n Z n(n is the number of points), then based on the scaling ratio K, the scaled three-dimensional coordinates of the points to be measured are obtained as (KX). n ,KY n ,KZ n ), define the three-dimensional coordinates of the actual measured point as (A n B n C n Then the deformation of the product is (A) n -KX n B n -KY n C n -KZ n Then, the scaling value in the X direction of the corresponding point 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 points on the mold corresponding to all test points in the X, Y, and Z directions are normally distributed in at least one direction, that is, they vary around a certain value rather than fluctuating randomly, then it can be determined that the product deformation is caused by the mold structure. Then, the mold cavity is adjusted according to the scaling values ​​in the above directions.

[0064] Specifically, for a certain point to be measured, if the actual measured Z-axis coordinate value is less than the theoretical Z-axis coordinate value, then the Z-axis dimension of the product needs to be increased, that is, the Z-axis dimension of the mold cavity needs to be increased, for example, by milling a part of the mold cavity upwards, i.e., reducing iron; if the actual measured Z-axis coordinate value of the point to be measured is greater than the theoretical Z-axis coordinate value, then the Z-axis dimension of the product needs to be decreased, that is, the Z-axis dimension of the mold cavity needs to be decreased, for example, by welding a part of the mold cavity upwards, i.e., adding iron.

[0065] If the scaling values ​​of all points on the mold corresponding to all test points are not normally distributed in the X, Y, and Z directions, then points with similar scaling ratios will be arranged to confirm the trend of the change in magnitude, and to determine whether to adjust the mold. At this time, the experience of the injection molding process engineer can be used to determine whether to adjust.

[0066] If the scaling ratio K is less than or equal to 1.01, it is likely due to the injection molding process. This should be reported to the injection molding engineer, who can adjust the injection pressure, and the product can be shrunk to complete the dimensional calibration.

[0067] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions claimed by the present invention.

Claims

1. A method for detecting the dimensions of injection molded products, characterized in that, Includes the following steps: 1) Determine the measurement reference point and establish a three-dimensional coordinate system based on the measurement reference point, using the measurement reference point as the origin of the coordinate system; 2) Position the product in this three-dimensional coordinate system, and convert the two-dimensional coordinates of all points of the product on the drawing into three-dimensional coordinates in this three-dimensional coordinate system as theoretical three-dimensional coordinate values; 3) Dimensional inspection, which includes fixed-point inspection and fixed-dimensional offset point detection; The detection method for the fixed point detection is as follows: the automated measuring device directly measures the three-dimensional coordinate values ​​of the fixed point on the product; The detection method for fixed-dimensional offset point finding detection is as follows: the point with the largest coordinate value in any dimension among all theoretical three-dimensional coordinate values ​​is taken as the point to be measured, and the automated measuring device measures the coordinate value of the point to be measured in that dimension. 4) Compare the actual measured values ​​of the fixed points and the measured points in step 3) with their corresponding theoretical coordinate values ​​to determine the warpage and deformation of the product in a certain dimension. If the product deforms in a certain dimension, determine the scaling ratio K based on the ratio of the actual size of the product to the standard size in that dimension. Based on this scaling ratio K, scale and offset the theoretical three-dimensional coordinate values ​​of all the fixed points according to this scaling ratio K, and then re-detect the fixed points to determine the actual warpage of the product. If the scaling ratio K is greater than 1.01, the injection molding product size detection method further includes a mold adjustment step, which specifically involves defining the theoretical three-dimensional coordinate values ​​of the measured points before scaling as (X... n ,Y n Z n ), where n is the number of points, then based on the scaling ratio K, the scaled three-dimensional coordinates of the point to be measured are obtained as (KX). n ,KY n KZ n ), define the three-dimensional coordinates of the measured point as (A) n B n C n Then the deformation of the product is (A) n -KX n B n -KY n C n -KZ n Then, the scaling value in the X direction of the corresponding point 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 points on the mold corresponding to all test points are normally distributed in at least one of the X, Y, and Z directions, then the mold cavity is adjusted according to the scaling values ​​in each of the above directions. 5) Measurement complete.

2. The method for detecting the dimensions of injection molded products according to claim 1, characterized in that, The method for determining the measurement reference point in step 1) is as follows: A rectangular base platform is placed on the workbench of the automated measuring device. Two rectangular positioning bars are fixed on the top surface of the rectangular base platform and are perpendicular to each other. The two rectangular positioning bars are parallel to a set of adjacent sides of the top surface of the rectangular base platform. The intersection of the length directions of the two rectangular positioning bars is the measurement reference point. The length directions of the two rectangular positioning bars are the X-axis direction and the Y-axis direction of the three-dimensional coordinate system, respectively. The direction passing through the measurement reference point and perpendicular to both the X-axis and the Y-axis is the Z-axis direction. The product is positioned on the rectangular base platform.

3. The method for detecting the dimensions of injection molded products according to claim 2, characterized in that, The product is placed on the rectangular base platform according to the orientation shown in the drawings and rests against the two rectangular positioning bars.

4. The method for detecting the dimensions of injection molded products according to claim 3, characterized in that, A pressure device applies pressure to the product, causing it to press against the two rectangular positioning bars. The product is equipped with a pressure sensor to prevent excessive pressure from causing product deformation.

5. The method for detecting the dimensions of injection molded products according to claim 1, characterized in that, Step 2) involves converting the two-dimensional coordinates of all points on the product in the drawing to three-dimensional coordinates in a three-dimensional coordinate system. The method is as follows: Determine the three-dimensional coordinate values ​​of each point on the product in the drawing by combining the views on the drawing, and then assign the three-dimensional coordinate values ​​of each point to (X1, Y1, Z1), (X2, Y2, Z2), ..., (X... n ,Y n Z n () indicates that n is the number of points; In the aforementioned three-dimensional coordinate system, the coordinates of the measurement reference point are (0,0,0). The difference between the origin on the drawing and the measurement reference point in the three-dimensional direction is (a,b,c). Therefore, the coordinates of each point in the three-dimensional coordinate system are (X1+a,Y1+b,Z1+c), (X2+a,Y2+b,Z2+c)...(X... n +a,Y n +b,Z n +c).

6. The method for detecting the dimensions of injection molded products according to claim 1, characterized in that, If the scaling values ​​of all points on the mold corresponding to all test points are not normally distributed in the X, Y, and Z directions, then points with similar scaling ratios will be arranged to confirm the trend of the change and determine whether mold adjustment is necessary.

7. The method for detecting the dimensions of injection molded products according to claim 1, characterized in that, If the scaling ratio K is less than or equal to 1.01, adjust the injection molding process.

8. The method for detecting the dimensions of injection molded products according to claim 1, characterized in that, The automated measurement device is a coordinate measuring machine or a blue light scanner.

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