Mechanical characteristic inspection device and injection molding system

Abstract

The invention provides a mechanical characteristic inspection device and an injection molding system, which can inspect the mechanical characteristics of a molded product molded by injection molding with a simple structure and high precision. This mechanical property inspection device inspects the mechanical properties of a molded article obtained by injection molding a resin material, and is provided with: a spectroscopic image acquisition unit that acquires spectroscopic images for a plurality of spectroscopic wavelengths with respect to the molded article; a spectrum calculation unit that calculates spectral spectra at a plurality of measurement points of the molded article on the basis of the spectral images for the plurality of spectral wavelengths; a characteristic value calculation unit that calculates spectral characteristic values at the predetermined spectral wavelengths in the spectral spectra at the plurality of measurement points; and a mechanical characteristic estimation unit that estimates the mechanical characteristics of the molded article on the basis of the spectral characteristic value.

Description

Technical Field

[0001] The present invention relates to a mechanical property inspection device and an injection molding system having the mechanical property inspection device. Background Art

[0002] There is known a device for inspecting the characteristics of injection molded resin products. The device described in Patent Document 1 irradiates light from a first light irradiation unit provided in a mold device or a mold clamping device to a molded product after mold opening, and guides the light transmitted through the molded product to a first light intensity detection unit through a light guide component composed of an optical fiber or the like and receives the light. In addition, light is irradiated from a second light irradiation unit provided in a nozzle of an injection device to a molding material in a molten state, and the light transmitted through the molding material is received by a second light intensity detection unit. Then, based on the light intensities detected by the first light intensity detection unit and the second light intensity detection unit, the degradation state of the molded product W is determined.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2015-189211

[0004] However, in the device described in Patent Document 1, light passing through a point of the molded product is guided to the first light intensity detection unit by a light guide member such as an optical fiber. In this case, the mechanical properties of the entire molded product cannot be checked. For example, there may be a case where the mechanical strength is uneven, such as deterioration only in a part of the molded product. In this case, if the deterioration state of the entire molded product is not detected, it is impossible to accurately determine whether the mechanical properties of the molded product are good or not.

[0005] In Patent Document 1, the intensity of light transmitted through the molding material is also detected by a second light intensity detection unit. However, since the overall degradation state of the molded product after injection molding is not checked, similarly to the above, local degradation cannot be detected and the mechanical properties of the molded product cannot be accurately determined. Summary of the invention

[0006] The mechanical property inspection device involved in the first mode of the present disclosure is a mechanical property inspection device for inspecting the mechanical properties of a molded product obtained by injection molding a resin material, and comprises: a spectral image acquisition unit, which acquires spectral images for multiple spectral wavelengths relative to the molded product; a spectrum calculation unit, which calculates the spectral spectra of multiple measurement points of the molded product based on the spectral images for the multiple spectral wavelengths; a characteristic value calculation unit, which calculates the spectral characteristic values ​​at predetermined spectral wavelengths in the spectral spectra of the multiple measurement points; and a mechanical property estimating unit, which estimates the mechanical properties of the molded product based on the spectral characteristic values.

[0007] An injection molding system according to a second aspect of the present disclosure is an injection molding system including the mechanical property inspection device according to the first aspect and an injection molding machine for forming the molded product by injection molding, wherein the injection molding machine adjusts injection molding conditions based on the estimation result of the mechanical property by the mechanical property inspection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a schematic diagram showing the configuration of the injection molding system according to the present embodiment.

[0009] Figure 2 This is a diagram showing the measurement results of optical spectra of a plurality of molded products having different degrees of progress of degradation.

[0010] Figure 3 Yes Figure 2 A graph of the second differential spectrum obtained by performing the second differential on the spectral spectrum of .

[0011] Figure 4 This is a diagram showing an example of a standard curve for detection in this embodiment.

[0012] Figure 5 This is a diagram showing an example of a characteristic distribution image.

[0013] Figure 6 1 is a flowchart showing a method for inspecting mechanical properties by the mechanical properties inspection apparatus according to the present embodiment.

[0014] Figure 7 This is a diagram showing an example of determining the inspection range of a molded product.

[0015] Figure 8 This is a flowchart showing a method for adjusting injection molding conditions according to the present embodiment.

[0016] Fig. 9 This is a diagram showing an example of a first characteristic calibration curve for obtaining molding conditions from average mechanical characteristic values.

[0017] Fig.10 This is a diagram showing an example of a second characteristic calibration curve for obtaining molding conditions from characteristic deviation values.

[0018] Description of Reference Numerals

[0019] 1…injection molding system; 10…mechanical property inspection device; 11…workbench; 12…reference body; 13…illumination unit; 14…photographing unit; 15…inspection processing unit; 20…injection molding machine; 21…hopper; 22…resin input amount adjustment unit; 24…cylinder; 25…heating unit; 26…screw; 27…injection unit; 28…molding mold; 29…injection control unit; 151…storage unit; 152…processor; 152A…spectral image acquisition unit; 152B…range determination unit; 152C…spectrum calculation unit; 152D…characteristic value calculation unit; 152E…mechanical property estimation unit; 152F…qualification / failure determination unit; 152G…shape inspection unit; 241…nozzle; 291…reference molding control unit; 292…average strength adjustment control unit; 293…strength unevenness adjustment control unit; 294…molding machine side storage unit; W…molded product. DETAILED DESCRIPTION

[0020] Hereinafter, one embodiment of the present disclosure will be described.

[0021] Figure 1 It is a schematic diagram showing the configuration of an injection molding system 1 according to the present embodiment.

[0022] exist Figure 1 In the embodiment, the injection molding system 1 includes a mechanical property inspection device 10 for inspecting the mechanical properties of a molded product W manufactured by injection molding, and an injection molding machine 20 for manufacturing the molded product W by injection molding.

[0023] [Configuration of Mechanical Properties Inspection Device 10]

[0024] The mechanical property inspection device 10 includes a stage 11 , a reference body 12 , an illumination unit 13 , an imaging unit 14 , and an inspection processing unit 15 .

[0025] The workbench 11 is a mounting table for mounting the molded product W to be inspected. The molded product W to be inspected may be all the molded products W manufactured by the injection molding machine 20 or may be the molded products W picked up at a predetermined cycle. In this embodiment, by performing the mechanical property inspection based on the spectral image, a rapid inspection can be performed, and even when all the molded products W are inspected, it is possible to avoid prolonging the time required for the mechanical property inspection.

[0026] The reference body 12 has a reference spectrum. The reference spectrum is a reflectance spectrum of the reference body 12, for example, light of each wavelength irradiated from the illumination unit 13 is reflected at a reflectance of 100% or approximately 100%. It should be noted that the workbench 11 may also be coated with a reference color without spectral unevenness, in which case the workbench 11 can function as the reference body 12.

[0027] The lighting unit 13 irradiates the molded product W and the reference body 12 with illumination light. A broadband light source such as a halogen lamp is preferred as the illumination light. It should be noted that if the spectrum (luminescence spectrum) of the illumination light is known, the grayscale value of each pixel of the spectral image can be corrected by the luminescence spectrum.

[0028] The photographing unit 14 is a spectroscopic camera that photographs a spectroscopic image, and more specifically, is a hyperspectral camera that can photograph spectroscopic images for a plurality of spectroscopic wavelengths in the near-infrared region. The photographing unit 14 photographs the spectroscopic image in such a manner that the molded product W placed on the workbench 11 is entirely contained in the image. The spectroscopic image may be photographed in such a manner that both the molded product W and the reference body 12 are contained in the image, or the molded product W and the reference body 12 may be photographed separately.

[0029] The inspection processing unit 15 can be a general computer such as a personal computer, a smart phone, or a tablet terminal. The inspection processing unit 15 controls the lighting unit 13 and the imaging unit 14 to perform inspection processing of the mechanical properties of the molded product W based on a plurality of spectral images of the molded product W captured by the imaging unit 14.

[0030] For example, the inspection processing unit 15 has a storage unit 151 composed of a memory, etc., a processor 152 composed of a CPU, etc., and other basic components of a general computer. In addition, the processor 152 reads and executes the program stored in the storage unit 151, so that Figure 1 As shown, it functions as a spectral image acquisition unit 152A, a range determination unit 152B, a spectrum calculation unit 152C, a characteristic value calculation unit 152D, a mechanical property estimation unit 152E, a pass / fail determination unit 152F, and a shape inspection unit 152G.

[0031] The spectral image acquisition unit 152A controls the lighting unit 13 and the imaging unit 14 to irradiate the molded product W and the reference body 12 with illumination light, and captures spectral images of a plurality of spectral wavelengths for the molded product W and the reference body 12, and acquires (receives) the spectral images from the imaging unit 14. It should be noted that, here, an example is shown in which the spectral image acquisition unit 152A controls the lighting unit 13 and the imaging unit 14 to capture the spectral image, but the lighting unit 13 and the imaging unit 14 may be configured to be independent of the inspection processing unit 15. For example, the spectral images for the molded product W and the reference body 12 may be captured by other spectral image capturing devices and stored in a data server on the Internet, and the spectral image acquisition unit 152A may acquire the spectral image by downloading the spectral image from the data server.

[0032] In addition, various image processing such as noise reduction processing and pattern recognition may be applied to the acquired spectral image using various digital filters.

[0033] The range determination unit 152B determines the inspection range in the molded product W from the spectral image. The inspection range may be determined by automatically detecting the outline of the molded product W from the spectral image using an edge detection filter and determining the inner side of the outline as the inspection range, or by allowing the user to specify the inspection range in the spectral image.

[0034] The spectrum calculation unit 152C uses a plurality of pixels included in the inspection range as measurement points and calculates the spectral spectrum of each measurement point. That is, the spectrum calculation unit 152C calculates the spectral spectrum of each pixel using each pixel value of the same pixel in the spectral image for a plurality of spectral wavelengths. As the spectral spectrum, for example, the light reflectance of each measurement point can be exemplified, but it is not limited to this. In the present embodiment, the light reflected by the molded product W is photographed by the photographing unit 14, but in the case where the molded product W has light transmittance, the light passing through the molded product W can also be photographed. In this case, the spectrum calculation unit 152C can also calculate the transmittance spectrum as the spectral spectrum. The reflectance spectrum and the transmittance spectrum are calculated using the pixel value of each measurement point and the pixel value of the image obtained by photographing the reference body 12. In the spectral image for each spectral wavelength including the reference body 12, the pixel value when the reference body 12 is photographed can use the pixel value of a point in the image of the reference body 12, or can use the average of the pixel values ​​of a plurality of points in the image of the reference body 12. In addition, here, the reflectance spectrum of each measurement point is calculated using the measurement value of the reference body 12 , but the pixel value of each measurement point may be directly used as the spectral spectrum.

[0035] The characteristic value calculation unit 152D calculates the spectral characteristic value at a predetermined characteristic wavelength at each measurement point based on the spectral spectrum. As the spectral characteristic value, for example, in this embodiment, the second derivative value of the spectral spectrum at the absorption peak wavelength corresponding to the resin material serving as the raw material of the molded product W is used.

[0036] Here, the relationship between the degradation state of the molded product W and the spectral characteristic value will be described.

[0037] Figure 2 Graph showing the results of measuring the optical spectra of a plurality of molded products W with different degrees of degradation. Figure 2 As shown in FIG. 1 , as the degradation of the molded product W progresses, the spectral spectrum changes. That is, according to the degree of degradation, the functional groups included in the resin structure of the molded product W change, and the amount of light absorbed at the absorption peak wavelength in the original (non-degraded) molded product W changes. Therefore, in the spectral spectrum, by comparing the reflectance for a predetermined characteristic wavelength, the degradation trend of the resin material can be known.

[0038] Figure 3 Yes Figure 2The second derivative spectrum is obtained by performing the second derivative of the spectral spectrum. By performing the second derivative of the spectral spectrum, the minimum value (that is, the absorption peak wavelength) in the spectral spectrum can be detected with high accuracy. When the absorption peak wavelength of the resin material is unclear, the absorption peak wavelength can also be determined based on the zero crossing point of the first derivative spectrum.

[0039] Figure 2 and Figure 3 The example shown is an example of a molded product W using recycled ABS resin, and absorption peak wavelengths appear at 875nm and 925nm. It can be seen that the reflectance at 875nm and 925nm changes depending on the degree of degradation of the resin material. Therefore, the characteristic value calculation unit 152D calculates the secondary differential value of either or both of 875nm and 925nm as the spectral characteristic value.

[0040] The mechanical property estimation unit 152E checks the mechanical property of the molded product W based on the spectral characteristic value. As described above, the degradation state of the molded product W and the spectral characteristic value are correlated, and the degradation trend of the molded product W can be estimated based on the spectral characteristic value.

[0041] More specifically, in this embodiment, characteristic detection data (calibration curve for detection) for detecting the mechanical characteristics of the molded product W with respect to the spectral characteristic value is pre-stored in the storage unit 151, and the mechanical characteristic value with respect to the spectral characteristic value calculated by the mechanical characteristic estimation unit is read. As the mechanical characteristic value, for example, known mechanical characteristics such as Charpy impact strength can be exemplified.

[0042] Figure 4 This is a diagram showing an example of a standard curve for detection.

[0043] For the detection standard curve, for example, a plurality of molded products W in a degraded state are prepared, and the spectral characteristic values ​​and mechanical characteristic values ​​for each of these molded products W are measured in advance. Then, the spectral characteristic values ​​and mechanical characteristic values ​​of each molded product W are plotted on a graph with the spectral characteristic value (for example, the quadratic differential value) as the horizontal axis and the mechanical characteristic value (for example, the Charpy impact strength) as the vertical axis, and a linear regression line is derived as the detection standard curve. It should be noted that this example is an example of deriving the detection standard curve through a regression line, but the detection standard curve may also be a curve form or a higher-order function of a second order or higher.

[0044] In addition, an example of using a detection standard curve as the characteristic detection data is shown, but for example, table data recording a plurality of spectral characteristic values ​​and corresponding mechanical characteristic values ​​may also be used. In this case, the mechanical characteristic estimation unit 152E may read the mechanical characteristic value closest to the calculated spectral characteristic value from the characteristic detection data, or calculate the mechanical characteristic value by interpolation.

[0045] As described above, the mechanical property estimation unit 152E calculates the mechanical property value at each measurement point and further calculates the average mechanical property value of the entire molded product W and the property deviation value indicating the deviation of the mechanical property.

[0046] For example, the mechanical characteristic estimation unit 152E calculates the arithmetic mean of the mechanical characteristic values ​​of all the measurement points included in the inspection range as the average mechanical characteristic value.

[0047] Furthermore, the mechanical characteristic estimation unit 152E calculates a characteristic deviation value based on the variance or standard deviation of the measurement points included in the inspection range.

[0048] The mechanical characteristic estimation unit 152E may further display a characteristic distribution image in which the mechanical characteristic values ​​at the respective measurement points in the molded product W are superimposed on the molded product W on a display (not shown).

[0049] Figure 5 : is a diagram showing an example of a characteristic distribution image. For example, for the appearance image of the molded product W, a characteristic distribution image colored with a color corresponding to the mechanical characteristic value can be displayed, or a characteristic distribution image in which the color is changed in shade according to the mechanical characteristic value can be displayed. Figure 5 In the example of , a characteristic distribution diagram is shown when the concentration increases as the degradation increases (the mechanical strength decreases). In addition, the mechanical characteristic values ​​may be binarized at a predetermined threshold value to separately display the portion with low mechanical characteristics and the portion with high mechanical characteristics.

[0050] The pass / fail judgment section 152F performs pass / fail judgment on the molded product W based on the inspection result (estimation result) of the mechanical characteristics. As the inspection and judgment of the mechanical characteristics, the difference between the calculated average mechanical characteristic value and the predetermined reference characteristic value is calculated, and it is judged whether the difference is less than a predetermined first threshold value. When the difference between the average mechanical characteristic value and the reference characteristic value is less than the first threshold value, it is judged that the mechanical characteristics are appropriate, and when it is greater than the first threshold value, it is judged that the mechanical characteristics are abnormal (brittle).

[0051] The pass / fail determination unit 152F determines whether the calculated characteristic deviation value is greater than a predetermined second threshold value. If the characteristic deviation value is less than the second threshold value, it is determined to be normal, and if it is greater than the second threshold value, it is determined to be defective because of a weak mechanical characteristic.

[0052] The shape inspection unit 152G also functions as a foreign matter detection unit of the present disclosure, and inspects the molded product W for abnormality in shape and the presence of foreign matter based on the spectral image.

[0053] The shape inspection unit 152G determines the outline of the molded product W by, for example, applying an edge detection filter to the spectral image, and inspects the molded product W for abnormalities in shape and the presence of foreign matter by comparing it with the shape data of the molded product W pre-stored in the storage unit 151 .

[0054] [Configuration of Injection Molding Machine 20]

[0055] like Figure 1 As shown, the injection molding machine 20 includes a hopper 21 , a resin input amount adjustment unit 22 , a cylinder 24 , a heating unit 25 , a screw 26 , an injection unit 27 , a molding die 28 , and an injection control unit 29 .

[0056] The hopper 21 is an inlet into which a resin material to be a molded product W is put.

[0057] The hopper 21 is connected to a resin inlet. The resin inlet is an inlet into which the main material of the molded product W is put, and recycled resin materials and new resin materials are put in. It should be noted that the recycled resin material and the new resin material may be put into the hopper 21 from different inlets, and the amount of these recycled resin materials and new resin materials put in may be adjusted.

[0058] The resin input amount adjustment unit 22 adjusts the input ratio and input amount of the recycled resin material and the new resin material in the resin material to be the material of the molded article W.

[0059] The cylinder 24 is a cylindrical member for introducing the resin material from the hopper 21. A nozzle 241 is provided at one end of the cylinder 24, and is connected to the molding die 28. The other end of the cylinder 24 is connected to the injection unit 27.

[0060] The heating unit 25 is a heater that heats and melts the resin material introduced into the cylinder 24. The heating unit 25 is provided in the cylinder 24, and heats and melts the resin material in the cylinder 24.

[0061] It should be noted that a pre-plunger for heating and kneading may be provided in the path from the hopper 21 to the cylinder 24. In this case, the heating unit 25 is provided in the pre-plunger to heat and melt the resin material before being introduced into the cylinder 24.

[0062] The screw 26 kneads the resin material by rotating about its axis. The screw 26 is provided in the cylinder 24, for example, and kneads the resin material introduced into the cylinder 24.

[0063] In addition, in the configuration in which a pre-plunger is provided in the path from the hopper 21 to the cylinder 24 as described above, the screw 26 may be provided in the pre-plunger to knead the resin material before being introduced into the cylinder 24 .

[0064] It should be noted that the kneaded product obtained by heating and melting the resin material including the recycled resin material and the new resin material and kneading it by the screw 26 is hereinafter referred to as a molten resin material.

[0065] The injection unit 27 applies pressure to the molten resin material in the cylinder 24 from the other end of the cylinder 24 to push it toward the nozzle 241. Figure 1 As shown, in a coaxial screw type injection molding machine 20 in which a screw 26 is disposed in a cylinder 24, an injection unit 27 moves the screw 26 forward and backward in the axial direction in the cylinder 24. Thus, the molten resin material pushed out by the screw 26 is injected into the molding die 28 from the nozzle 241.

[0066] It should be noted that, when a pre-plunger is provided in the path from the hopper 21 to the cylinder 24 , the injection unit 27 moves the injection plunger inserted into the cylinder 24 forward and backward in the cylinder 24 .

[0067] The molding die 28 is a die corresponding to the shape of the molded product W, and forms the molded product W by introducing molten resin injected from the cylinder 24 .

[0068] It should be noted that the hopper 21 , the resin input amount adjustment unit 22 , the cylinder 24 , the heating unit 25 , the screw 26 , the injection unit 27 , and the molding die 28 may constitute one batch, and the injection molding machine 20 may have a plurality of batches.

[0069] The injection control unit 29 controls the resin input amount adjustment unit 22, the heating unit 25, the screw 26, and the injection unit 27. Specifically, the injection control unit 29 includes a reference molding control unit 291, an average strength adjustment control unit 292, a strength variation adjustment control unit 293, and a molding machine side storage unit 294.

[0070] The reference molding control unit 291 sets the default molding conditions based on the reference conditions set according to the molded product W to be molded. That is, the reference molding control unit 291 sets the input amount of the resin material, the input ratio of the new resin material to the recycled resin material (hereinafter referred to as the resin input ratio), the heating temperature (plasticizing temperature) generated by the heating unit 25, the screw rotation speed of the screw 26, and the injection pressure (for example, injection speed and injection amount) of the molten resin material injected by the injection unit 27. It should be noted that here, the ratio of the input amount of the new resin material to the input amount of the recycled resin material is set as the resin input ratio, but the ratio of the input amount of the recycled resin material to the input amount of the new resin material may also be set as the resin input ratio.

[0071] The average strength adjustment control unit 292 adjusts at least one of the resin input ratio and the plasticizing temperature based on the average mechanical property value output from the mechanical property inspection device 10 .

[0072] The strength unevenness adjustment control unit 293 adjusts the plasticizing temperature, the screw rotation speed, the residence time of the molten resin material in the cylinder 24 (that is, the time for the screw 26 to mix the resin material and the masterbatch, the injection interval of the injection unit 27), and the injection pressure of the molten resin material according to the characteristic deviation value output from the mechanical property inspection device 10.

[0073] [Method for inspecting mechanical properties of injection molding system 1]

[0074] Next, the mechanical property inspection method in the injection molding system 1 will be described in more detail.

[0075] Figure 6 1 is a flowchart showing a mechanical property inspection method performed by the mechanical property inspection device 10 .

[0076] In the mechanical property inspection method performed by the mechanical property inspection device 10 , a molded product W molded by the injection molding machine 20 of the injection molding system 1 is inspected as an inspection object.

[0077] Regarding the molded products W to be inspected, the molded products W may be randomly selected at an arbitrary timing as described above, or all the molded products W may be made inspected.

[0078] First, the molded product W to be inspected is picked up and placed on the workbench 11, and the molded product W is illuminated by the lighting unit 13 (step S1). Then, the spectral image acquisition unit 152A controls the imaging unit 14 to capture spectral images for multiple spectral wavelengths (step S2). At this time, the spectral image for the reference body 12 is also captured simultaneously. In step S2, when capturing each spectral image, the relative position of the imaging unit 14 and the molded product W is fixed and the capturing process is performed.

[0079] Next, the range specifying unit 152B specifies the inspection range of the molded product W in each spectral image (step S3 ).

[0080] Figure 7 1 is a diagram showing an example of determining the inspection range of the molded product W. For example, the range determination unit 152B determines the edge W1 (contour portion) of the molded product W through edge detection processing, and sets the inner side of the edge W1 as the inspection range Ws. Figure 7As shown in FIG. 1 , when another closed edge W2 is detected inside the closed edge W1, the inspection range Ws between the edge W1 and the edge W2 can also be determined. It should be noted that since the edges W1 and W2 are points where the brightness value changes greatly, when these edges W1 and W2 are set as the inspection objects, the accuracy of the mechanical property inspection will be affected. Figure 7 As shown, it is also possible to connect points that are away from the edges W1 and W2 by a predetermined size ( Figure 7 Alternatively, the inspection range may be specified by the user.

[0081] Next, the spectrum calculation unit 152C calculates the spectral spectrum using each pixel of the inspection range Ws determined in step S3 as a measurement point (step S4 ).

[0082] For example, the spectrum calculation unit 152C uses the pixel position (x, y) of the spectral image as a measurement point and calculates the luminance value r at the pixel position (x, y) of the spectral image based on the luminance value r at the pixel position (x, y) of the spectral image. i (x, y) and the reference body 12 with respect to the spectral wavelength λ i The brightness value r b , through R(x, y, λ i ) = r i (x, y) / r b To calculate the spectral wavelength λ at each measurement point (x, y) i The reflectivity R(x, y, λ i ). It should be noted that i is a variable representing the spectral wavelength and is an integer from 1 to I. For example, for the visible light region of 400nm to 700nm, when the spectral image is captured at a spectral wavelength interval of 20nm, I=16. Thus, it is possible to calculate the following for each measurement point: Figure 2 Spectral spectrum (reflectance spectrum) shown.

[0083] Next, the characteristic value calculation unit 152D calculates the spectral characteristic value based on the calculated spectral spectrum of each measurement point (step S5 ).

[0084] For example, the characteristic value calculation unit 152D calculates the second differential spectrum of the spectral spectrum at each measurement point, and calculates the second differential value of a predetermined absorption peak wavelength as the spectral characteristic value.

[0085] Next, the mechanical property estimation unit 152E uses the calculated spectral characteristic value and the information stored in advance in the storage unit 151. Figure 4 The mechanical property value (for example, Charpy impact strength) of each measurement point is calculated using the detection calibration curve shown (step S6).

[0086] Furthermore, the mechanical property estimation unit 152E calculates the average mechanical property value and the property variation value of the entire molded product W based on the mechanical property value calculated for each measurement point (step S7 ).

[0087] At this time, the mechanical property estimation unit 152E may also calculate Figure 5 The characteristic distribution image shown is displayed on a display (not shown).

[0088] Thereafter, the pass / fail determination unit 152F determines whether or not there is an abnormality in the mechanical properties of the molded product W based on the inspection result of the mechanical properties (step S8 ).

[0089] For example, the pass / fail judgment unit 152F calculates the difference (mechanical property evaluation value) between the reference mechanical strength set for each molded product W and the average mechanical property value calculated in step S7, and judges it as passed when the mechanical property evaluation value is less than the first threshold, and judges it as unqualified when it is greater than the first threshold.

[0090] Furthermore, the pass / fail determination unit 152F calculates the difference (deviation evaluation value) between the characteristic deviation value calculated in step S7 and a preset reference deviation value, and determines the product to be pass when the deviation evaluation value is less than a second threshold value, and determines the product to be fail when the deviation evaluation value is greater than the second threshold value.

[0091] In step S8, if the determination result is "yes", that is, if there is no abnormality in the mechanical properties of the molded product W, the mechanical property inspection process is terminated. In this case, it is determined that the molding conditions of the injection molding machine 20 are optimal, and the existing injection molding conditions are maintained, and the manufacture of the molded product W by the injection molding machine 20 is continued.

[0092] On the other hand, if the determination result is "No" in step S8, that is, if there is an abnormality in the mechanical characteristics of the molded product W, the calculated mechanical characteristics inspection result is output to the injection control unit 29 of the injection molding machine 20 (step S9). The inspection result may be, for example, an average mechanical characteristic value and a characteristic deviation value, or a mechanical characteristic evaluation value, a deviation evaluation value, or both. Thus, if the determination result is "No" in step S8, the molding conditions of the molded product W are adjusted by the injection control unit 29.

[0093] In addition, in the present embodiment, the shape inspection unit 152G of the mechanical property inspection device 10 performs shape inspection of the molded product W based on the spectral image acquired in step S2 (step S10). As the timing of the shape inspection, after the inspection of the mechanical properties of steps S4 to S9 is exemplified, but it may also be after steps S2 and S3. The shape inspection unit 152G performs edge detection processing on the spectral image, detects the edges W1 and W2 of the molded product W, and compares them with the shape data (reference data) of the molded product W pre-stored in the storage unit 151, for example, as in step S3. When the shape of the edges W1 and W2 is different from the shape data, it is determined that the shape of the molded product W is abnormal, and when an edge different from the edges W1 and W2 is detected, it is determined that there is a foreign object.

[0094] The shape inspection result of the shape inspection unit 152G may be appropriately displayed on a display.

[0095] [Adjustment of molding conditions of injection molding machine 20]

[0096] In the injection molding system 1 of the present embodiment, when it is determined to be "No" in step S8, control is performed to adjust the molding conditions of the molded product W to manufacture a molded product W having predetermined mechanical properties. When the injection molding system 1 has a plurality of batches, the molded products W molded in each batch are inspected by the mechanical property inspection device 10, and the molding conditions for each batch are individually adjusted based on the respective inspection results.

[0097] Figure 8 This is a flowchart showing a method for adjusting injection molding conditions.

[0098] When the injection control unit 29 receives the inspection results of the mechanical properties from the mechanical property inspection device 10 (step S21 ), it determines whether the received inspection results include an average mechanical property value (or mechanical property evaluation value), that is, whether the average mechanical property value is abnormal (step S22 ).

[0099] If the judgment in step S22 is "yes", that is, if it is judged that the overall mechanical properties of the molded product W are abnormal, the average strength adjustment control unit 292 of the injection control unit 29 controls at least one of the resin input amount adjustment unit 22 and the heating unit 25 to adjust at least one of the molding conditions of the resin input ratio and the plasticizing temperature in the resin material (step S23). For example, the average strength adjustment control unit 292 adjusts the resin input ratio while maintaining the plasticizing temperature constant. Alternatively, the average strength adjustment control unit 292 adjusts the plasticizing temperature while maintaining the resin input ratio constant.

[0100] Here, as an example, a case of adjusting the plasticizing temperature will be described.

[0101] Fig. 9 This is an example of a first characteristic calibration curve for obtaining molding conditions from average mechanical characteristic values.

[0102] In this embodiment, the Fig. 9 The first characteristic standard curve showing the relationship between the average mechanical characteristic value and the molding condition is pre-stored in the molding machine storage unit 294. The molding condition here is referred to as the first molding parameter to distinguish it from the molding condition for the deviation of the mechanical characteristic described later.

[0103] The first molding parameter is the resin input ratio or plasticizing temperature. Fig. 9 In the example, the resin input ratio (the input ratio of the new resin material to the recycled resin material) is set as the first molding parameter.

[0104] It should be noted that in Fig. 9 In the example of FIG. 1 , the relationship between the mechanical characteristic value and a first molding parameter is shown, but the first characteristic standard curve can also be shown on a three-axis coordinate system with the resin input ratio as the X-axis, the plasticizing temperature as the Z-axis, and the mechanical characteristic value as the Y-axis. In other words, a function using the three variables of the resin input ratio, the plasticizing temperature, and the mechanical characteristic value can also be used as the first characteristic standard curve.

[0105] In step S23, the average strength adjustment control unit 292 uses the first characteristic standard curve as described above to adjust the first molding parameter change and the average mechanical characteristic value A input from the mechanical characteristic inspection device 10. 1 The target value of the molded product W (reference mechanical property value A 0 ) corresponds to the value of the difference ΔA. For example, when the current resin input ratio is a 1 , the adjusted condition (resin input ratio corresponding to the target value) is a 0 In the case of 0 -a 1 Thus, the first molding parameter is adjusted so that the difference between the average mechanical characteristic value and the reference mechanical characteristic value (mechanical characteristic evaluation value) is smaller than the first threshold value.

[0106] It should be noted that the above is an example of adjusting the resin input ratio, but the plasticizing temperature may be used as the first molding parameter. In this case, a first characteristic standard curve indicating the relationship between the average mechanical characteristic value and the plasticizing temperature may be used.

[0107] After step S23 and in a case where the determination in step S22 is “NO”, the injection control unit 29 determines whether the inspection result of the mechanical characteristics received in step S21 includes a characteristic deviation value (step S24 ).

[0108] If the result of the determination in step S24 is "yes", that is, if it is determined that the molded product W has an abnormal deviation in mechanical properties, the strength variation adjustment control unit 293 of the injection control unit 29 adjusts at least one molding condition among the plasticizing temperature, the screw rotation speed, the residence time, and the injection pressure (step S25). In order to distinguish from the above-mentioned first molding parameter, the molding condition here is referred to as the second molding parameter.

[0109] For example, the strength variation adjustment control unit 293 may adjust one of the second molding parameters for determining the variation in mechanical characteristics and fix the other parameters, or may adjust a plurality of second molding parameters.

[0110] Fig.10 This is a diagram showing an example of a second characteristic calibration curve for obtaining molding conditions from characteristic deviation values.

[0111] exist Fig.10 In the second characteristic standard curve shown in FIG. 1 , the second molding parameter is any one of the plasticizing temperature, the screw rotation speed, the residence time and the injection pressure, for example, the screw rotation speed. Fig.10 In the example of , the relationship between the characteristic deviation value and one second molding parameter is shown, but a function representing the relationship between a plurality of second molding parameters and the characteristic deviation value may be used as the second characteristic standard curve.

[0112] The adjustment of the second molding parameter is roughly the same as the adjustment of the average mechanical strength. Fig.10 The second characteristic standard curve shown is pre-stored in the molding machine side storage unit 294. In step S25, the strength variation adjustment control unit 293 adjusts the second molding parameter based on the characteristic deviation value input from the mechanical property inspection device 10 and the second characteristic standard curve so that the difference (deviation evaluation value) between the characteristic deviation value and the reference characteristic deviation value is less than the second threshold value.

[0113] For example, the strength variation adjustment control unit 293 changes the second molding parameter to the characteristic deviation value B input from the mechanical characteristic inspection device 10. 1 The target value of the molded product W (reference deviation value B 0 ) corresponds to the value of the difference ΔB. For example, when the current screw rotation speed is b 1 , the adjusted condition (screw rotation speed corresponding to the target value) is b 0 In the case of 0 -b 1 Thus, the second molding parameter is adjusted so that the difference between the characteristic deviation value and the reference deviation value (deviation evaluation value) is less than the second threshold value. Thus, the kneading performance of the screw 26 is improved, and the deviation of the mechanical properties of the molded product W is improved.

[0114] It should be noted that the above is an example of adjusting the screw rotation speed, but as mentioned above, when adjusting the plasticizing temperature, the strength unevenness adjustment control unit 293 adjusts the heating temperature of the heating unit 25. When adjusting the residence time, the strength unevenness adjustment control unit 293 adjusts the interval of the injection of the molten resin by the injection unit 27. When adjusting the injection pressure, the strength unevenness adjustment control unit 293 adjusts the speed and injection amount of the molten resin injected by the injection unit 27.

[0115] [Effects of this embodiment]

[0116] The injection molding system 1 of the present embodiment includes a mechanical property inspection device 10, which inspects the mechanical properties of a molded product W obtained by injection molding a resin material. The processor 152 of the mechanical property inspection device 10 functions as a spectral image acquisition unit 152A, a spectrum calculation unit 152C, a characteristic value calculation unit 152D, and a mechanical property estimation unit 152E. The spectral image acquisition unit 152A acquires spectral images for a plurality of spectral wavelengths with respect to the molded product W. The spectrum calculation unit 152C calculates spectral spectra of a plurality of measurement points of the molded product W based on the spectral images for a plurality of spectral wavelengths. The characteristic value calculation unit 152D calculates spectral characteristic values ​​at predetermined spectral wavelengths based on the spectral spectra of each of the plurality of measurement points. The mechanical property estimation unit 152E estimates the mechanical properties of the molded product W based on the spectral characteristic values.

[0117] In this embodiment, the mechanical properties of the molded product W are inspected based on the spectral image obtained by photographing the entire molded product W. Therefore, compared with the case where a point of the molded product W is measured by spot light, the average mechanical properties of the entire molded product W and the unevenness (deviation) of the mechanical properties can be appropriately measured. In addition, compared with the case where the molded product W is scanned by changing the irradiation position of the spot light using a scanning mechanism, or the case where the relative position between the spot light and the molded product W is moved by a moving mechanism to change the measurement position, the configuration is simplified.

[0118] In the mechanical property inspection device 10 of the present embodiment, the mechanical property estimation unit 152E calculates the mechanical property value corresponding to the spectral characteristic value at each measurement point using a detection calibration curve that indicates the relationship between the mechanical property value indicating the degradation state of the molded product W molded from a resin material and the spectral characteristic value. Then, the mechanical property estimation unit 152E calculates the average value of the mechanical property values ​​calculated for each measurement point as the average mechanical property value of the molded product W.

[0119] By using the pixels included in the inspection range as measurement points, the mechanical characteristic values ​​of each position in a wide range of the molded product W can be calculated. By calculating the arithmetic average of these mechanical characteristic values, the average mechanical characteristic value of the entire molded product W can be obtained. In other words, in the measurement of one point using spot light, if the mechanical characteristics of each part of the molded product W vary, the correct mechanical characteristics of the molded product W cannot be determined. In contrast, the arithmetic average of the mechanical characteristic values ​​of multiple points in the molded product W becomes a value that represents the trend of the mechanical characteristics of the entire molded product W, and the mechanical characteristics of the entire molded product W can be appropriately inspected.

[0120] In addition, in the present embodiment, the mechanical characteristic estimation unit 152E calculates the mechanical characteristic value corresponding to the spectral characteristic value at each measurement point using a detection calibration curve that indicates the relationship between the mechanical characteristic value indicating the degradation state of the molded product W molded from a resin material and the spectral characteristic value. Furthermore, the mechanical characteristic estimation unit 152E calculates the deviation (specific deviation value) of the mechanical characteristic value calculated for each measurement point.

[0121] As described above, by using the pixels included in the inspection range as measurement points, it is possible to calculate the mechanical characteristic values ​​of each position in a wide range of the molded product W. In addition, the mechanical characteristic estimation unit 152E can determine the degree of in-plane deviation of the mechanical characteristics of the molded product W by calculating the characteristic deviation value. In other words, when the characteristic deviation value is large, it means that there are points in the molded product W with greatly different mechanical characteristics, that is, there are positions with smaller mechanical characteristics than others. In this case, a part of the molded product W is easily damaged. In this embodiment, it is possible to appropriately determine such a molded product W with a large in-plane deviation of the mechanical characteristics.

[0122] In the present embodiment, the spectral characteristic value is a second derivative value of the spectral spectrum at an absorption peak wavelength corresponding to the resin material of the molded article W.

[0123] In the resin molded product W, there is an absorption peak wavelength corresponding to the resin material, and the spectral reflectivity at the absorption peak wavelength changes according to the resin degradation state. Therefore, the degradation of the molded product W can be determined based on the change of the reflectivity at the absorption peak wavelength. In addition, the secondary differential spectrum obtained by performing a secondary differentiation on the spectral spectrum also takes a maximum or minimum value at the absorption peak wavelength. In addition, in the secondary differential spectrum, the difference in the spectral shape other than the absorption peak wavelength is small, and the spectral shape at the absorption peak wavelength is greatly different depending on the degradation of the resin. Therefore, when using the secondary differential spectrum, even if the absorption peak wavelength corresponding to the resin material is unclear, or when the absorption peak wavelength changes according to the modification of the resin material, the input ratio of the recycled resin material and the new resin material included in the resin material, the input amount of the masterbatch, etc., the absorption peak wavelength can be easily determined.

[0124] In the present embodiment, the processor 152 also functions as a pass / fail determination unit 152F, and determines whether the molded product W is a pass / fail product based on the inspection result (estimation result) of the mechanical characteristic value by the mechanical characteristic estimation unit 152E.

[0125] Thereby, average mechanical properties of the molded product W and abnormalities in variations in mechanical properties can be easily determined.

[0126] The injection molding system 1 of the present embodiment includes the mechanical property inspection device 10 described above and an injection molding machine 20 that forms a molded product W by injection molding. The injection molding machine 20 adjusts injection molding conditions based on the inspection results (estimation results) of the mechanical properties by the mechanical property inspection device 10 .

[0127] Therefore, when average mechanical properties or deviations in mechanical properties of the molded product W occur, the injection molding machine 20 can adjust molding conditions based on the inspection results of the mechanical properties, thereby reducing the defective product rate of the molded product W molded by the injection molding machine 20.

[0128] In the present embodiment, the injection molding machine 20 calculates the mechanical characteristic value corresponding to the spectral characteristic value at each measurement point using a detection standard curve indicating the relationship between the mechanical characteristic value indicating the degradation state of the molded product W and the spectral characteristic value, and calculates the average value of the mechanical characteristic value calculated for each measurement point as the average mechanical characteristic of the molded product W. The injection molding machine 20 includes a hopper 21, a resin input amount adjustment unit 22, a cylinder 24, and a heating unit 25, and adjusts at least one of the ratio of the input amount of the recycled resin material to the input amount of the new resin material, that is, the resin input ratio, and the plasticization temperature generated by the heating unit 25 based on the average mechanical characteristic.

[0129] Thus, by adjusting at least one of the resin input ratio and the plasticizing temperature based on the average mechanical property value, it is possible to mold a molded product W having appropriate mechanical properties. In the case where it is difficult to adjust the average mechanical property value of the molded product W by only using either the resin input ratio or the plasticizing temperature, it is possible to adjust both the resin input ratio and the plasticizing temperature, thereby molding a molded product W having desired average mechanical properties.

[0130] In the present embodiment, the mechanical property estimation unit 152E calculates the property deviation value as the mechanical property deviation of the molded product W. In addition, the injection molding machine 20 includes a hopper 21, a cylinder 24, a heating unit 25, a screw 26, and an injection unit 27, and adjusts at least one of the plasticizing temperature, the screw rotation speed, the residence time (kneading time), and the injection pressure based on the mechanical property deviation value.

[0131] Thus, at least one of the plasticizing temperature, the screw rotation speed, the residence time, and the injection pressure can be adjusted based on the characteristic deviation value, so that a molded product W without deviation in mechanical characteristics can be molded. In addition, when it is difficult to adjust the in-plane unevenness of the mechanical characteristics of the molded product W by only one of the plasticizing temperature, the screw rotation speed, the residence time, and the injection pressure, it is also possible to adjust multiple or all of the plasticizing temperature, the screw rotation speed, the residence time, and the injection pressure, so that a molded product W without in-plane unevenness in mechanical characteristics can be molded.

[0132] In the present embodiment, the processor 152 of the mechanical property inspection device 10 also functions as a shape inspection unit 152G, and inspects foreign matter included in the molded product W and abnormality in shape of the molded product W based on the spectral image.

[0133] Thus, not only abnormalities in average mechanical properties and variations in mechanical properties of the molded product W but also abnormalities in shape and foreign matter of the molded product W can be determined.

[0134] [Modifications]

[0135] It should be noted that the present invention is not limited to the above-described embodiments, and configurations obtained by modifications, improvements, and appropriate combinations of the embodiments within the scope that can achieve the object of the present invention are also included in the present invention.

[0136] (Variant 1)

[0137] In the above embodiment, an example is shown in which the mechanical property inspection device 10 inspects both the average mechanical property and the in-plane variation of the mechanical property. However, only the average mechanical property may be inspected, or only the in-plane variation of the mechanical property may be inspected.

[0138] (Variant 2)

[0139] The characteristic value calculation unit 152D calculates the value (secondary differential value) at the absorption peak wavelength of the second differential spectrum obtained by secondarily differentiating the spectral spectrum as the spectral characteristic value, but the present invention is not limited to this.

[0140] The characteristic value calculation unit 152D may use the spectral reflectance at the absorption peak wavelength in the spectral spectrum as the spectral characteristic value.

[0141] In addition, as the spectral characteristic values, the second derivative value and reflectivity at the absorption peak wavelength corresponding to the resin material are exemplified, but the second derivative value and reflectivity at other wavelengths may also be used. Figure 3 As shown in FIG. 1 , when the resin deteriorates, the reflectivity also changes at wavelengths other than the absorption peak wavelength. Therefore, the reflectivity and the first differential value at any of the other wavelengths may be set as the spectral characteristic value. For example, in the first differential spectrum obtained by first differentiating the spectral spectrum, the first differential value of the wavelength that takes the maximum value or the minimum value may be set as the spectral characteristic value.

[0142] In addition, as described above, when the absorption peak wavelength of the resin material is unclear, the absorption peak wavelength can also be determined based on the zero crossing point of the first differential spectrum. Alternatively, as described above, even when the absorption peak wavelength changes depending on the modification of the resin material, the input ratio of the recycled resin material and the new resin material included in the resin material, the input amount of the masterbatch, etc., the absorption peak wavelength can be easily determined based on the first differential spectrum, so that the second differential value of the determined absorption peak wavelength and the reflectivity can be calculated as the spectral characteristic value.

[0143] (Variant 3)

[0144] In the above embodiment, the processor 152 of the mechanical property inspection device 10 is shown as an example of functioning as the shape inspection unit 152G, but the injection control unit 29 of the injection molding machine 20 can also be configured to obtain a spectral image from the mechanical property inspection device 10 to inspect the presence of foreign matter and shape abnormalities.

[0145] [Summary of the present disclosure]

[0146] The mechanical property inspection device involved in the first mode of the present disclosure is a mechanical property inspection device for inspecting the mechanical properties of a molded product obtained by injection molding a resin material, and comprises: a spectral image acquisition unit, which acquires spectral images for multiple spectral wavelengths relative to the molded product; a spectrum calculation unit, which calculates the spectral spectra of multiple measurement points of the molded product based on the spectral images for the multiple spectral wavelengths; a characteristic value calculation unit, which calculates the spectral characteristic values ​​at predetermined spectral wavelengths in the spectral spectra of the multiple measurement points; and a mechanical property estimating unit, which estimates the mechanical properties of the molded product based on the spectral characteristic values.

[0147] In the mechanical property inspection device of this embodiment, the mechanical property inspection of the molded product is carried out based on the spectral image obtained by photographing the entire molded product. Therefore, compared with the case where a point of the molded product is measured by spot light, the average mechanical property of the entire molded product and the in-plane unevenness of the mechanical property can be appropriately measured. In addition, compared with the case where the molded product is scanned by changing the irradiation position of the spot light using a scanning mechanism, or the case where the relative position between the spot light and the molded product is moved by a moving mechanism to change the measurement position, the structure is simplified.

[0148] In the mechanical property inspection device of this embodiment, it is preferred that the mechanical property estimating unit uses a standard curve to calculate the mechanical property value corresponding to the spectral characteristic value of each of the measurement points, and calculates the average value of the mechanical property value calculated for each of the measurement points as the average mechanical property of the molded product, and the standard curve represents the relationship between the mechanical property value representing the degradation state of the molded product molded by the resin material and the spectral characteristic value.

[0149] Thus, by using pixels included in the inspection range as measurement points, mechanical property values ​​at various positions in a wide range of the molded product can be easily calculated, and by calculating the average mechanical property value of the arithmetic mean, the mechanical properties of the entire molded product can be inspected.

[0150] In the mechanical property inspection device of this embodiment, the mechanical property estimation unit can calculate the mechanical property value corresponding to the spectral characteristic value at each of the measurement points using a calibration curve indicating the relationship between the mechanical property value indicating the degradation state of the molded product molded from the resin material and the spectral characteristic value, and calculate the deviation of the mechanical property value calculated for each of the measurement points as the in-plane deviation of the mechanical property of the molded product.

[0151] Thus, similarly to the above-described embodiment, the mechanical property estimation unit can easily calculate the mechanical property value corresponding to the spectral characteristic value at each measurement point using a calibration curve indicating the relationship between the mechanical property value indicating the degradation state of the molded product molded from the resin material and the spectral characteristic value. Furthermore, by calculating the deviation of the mechanical property value calculated for each measurement point, it is possible to detect the in-plane deviation of the mechanical property of the molded product.

[0152] In the mechanical property inspection device of this aspect, the spectral characteristic value is a second derivative value of the spectral spectrum at an absorption peak wavelength corresponding to the resin material of the molded article.

[0153] The second differential spectrum takes a minimum value at the absorption peak wavelength. Depending on the resin degradation state, even if the change in the second differential value at other wavelengths is small, the change in the second differential value at the absorption peak wavelength will become larger. Therefore, by setting the second differential value as the spectral characteristic value, the degradation state of the resin material can be appropriately judged. In addition, even if the absorption peak wavelength corresponding to the resin material is unclear, and the absorption peak wavelength changes due to the modification of the resin material, the input ratio of the recycled resin material and the new resin material included in the resin material, and the input amount of the masterbatch, the absorption peak wavelength can be easily determined.

[0154] The mechanical property inspection device of this aspect further includes a pass / fail determination unit configured to determine whether the molded product is a pass / fail product based on the estimation result of the mechanical property by the mechanical property estimation unit.

[0155] This makes it possible to determine whether the molded product is good or bad based on the inspection results of the mechanical properties of the molded product.

[0156] An injection molding system according to a second aspect of the present disclosure is an injection molding system including the mechanical property inspection device according to the first aspect and an injection molding machine for forming the molded product by injection molding, wherein the injection molding machine adjusts injection molding conditions based on the estimation result of the mechanical property by the mechanical property inspection device.

[0157] Thus, the injection molding conditions can be adjusted based on the inspection results of the mechanical properties by the mechanical property inspection device so that abnormalities in the mechanical properties do not occur, thereby improving the quality of the molded product molded by the injection molding machine.

[0158] In the injection molding system of the present embodiment, the mechanical property estimation unit uses a standard curve to calculate the mechanical property value corresponding to the spectral characteristic value of each of the measurement points, and calculates the average value of the mechanical property value calculated for each of the measurement points as the average mechanical property of the molded product, and the standard curve represents the relationship between the mechanical property value representing the degradation state of the molded product molded by the resin material and the spectral characteristic value. The injection molding machine comprises: a hopper, into which the resin material is fed; a resin feed amount adjustment unit, which adjusts the feed ratio of recycled resin material and new resin material included in the resin material fed into the hopper; a cylinder, into which the resin material fed from the hopper is conveyed; and a heating unit, which heats the resin material in the cylinder to plasticize it, and adjusts at least one of the feed ratio and the plasticizing temperature generated by the heating unit based on the average mechanical property.

[0159] Thus, at least one of the input ratio of recycled resin material to new resin material and the plasticizing temperature in the resin material can be appropriately adjusted based on the average mechanical property value, thereby molding a molded product having a desired average mechanical property value.

[0160] In the injection molding system of the present embodiment, the mechanical property estimation unit uses a standard curve to calculate the mechanical property value corresponding to the spectral characteristic value of each of the measurement points, and calculates the deviation of the mechanical property value calculated for each of the measurement points as the mechanical property deviation of the molded product. The standard curve represents the relationship between the mechanical property value representing the degradation state of the molded product molded by the resin material and the spectral characteristic value. The injection molding machine comprises: a hopper, into which the resin material is put; a cylinder, into which the resin material put from the hopper is conveyed; a heating unit, which heats the resin material in the cylinder to plasticize it; a screw, which is inserted into the cylinder to mix the resin material and can adjust the rotation speed; and an injection unit, which pushes out the resin material in the cylinder, and adjusts at least one of the plasticizing temperature, the rotation speed of the screw, the time for the screw to mix the resin material, and the injection pressure in the injection unit based on the mechanical property deviation.

[0161] Thus, at least any one of the plasticizing temperature, the screw rotation speed, the residence time, and the injection pressure can be adjusted based on the property deviation value, so that a molded product having no in-plane variation in mechanical properties can be molded.

[0162] The injection molding system of this aspect preferably further includes a foreign matter detection unit configured to detect foreign matter included in the molded product based on the spectral image.

[0163] This makes it possible to further perform an inspection on whether or not a molded product formed by the injection molding system contains foreign matter.

[0164] The injection molding system of this aspect preferably further includes a shape inspection unit that inspects a shape of the molded product based on the spectral image.

[0165] This makes it possible to further inspect the shape abnormality of the molded product formed by the injection molding system.

Claims

1. A mechanical property inspection device, characterized in that: A device for inspecting mechanical properties of a molded product obtained by injection molding a resin material, the device comprising: a spectral image acquisition unit that acquires spectral images for a plurality of spectral wavelengths with respect to the molded product; a spectrum calculation unit that calculates spectral spectra of a plurality of measurement points of the molded product based on the spectral images for the plurality of spectral wavelengths; a characteristic value calculation unit that calculates spectral characteristic values ​​at predetermined spectral wavelengths in the spectral spectra at the plurality of measurement points; as well as The mechanical property estimating unit estimates the mechanical property of the molded product based on the spectral characteristic value.

2. The mechanical property inspection device according to claim 1, characterized in that: The mechanical property estimation unit calculates the mechanical property value corresponding to the spectral characteristic value of each of the measurement points using a standard curve, and calculates the average value of the mechanical property value calculated for each of the measurement points as the average mechanical property of the molded product. The standard curve represents the relationship between the mechanical property value representing the degradation state of the molded product molded from the resin material and the spectral characteristic value.

3. The mechanical property inspection device according to claim 1, characterized in that: The mechanical property estimation unit calculates the mechanical property value corresponding to the spectral characteristic value at each of the measurement points using a standard curve, and calculates the deviation of the mechanical property value calculated for each of the measurement points as the in-plane deviation of the mechanical property of the molded product. The standard curve represents the relationship between the mechanical property value representing the degradation state of the molded product molded from the resin material and the spectral characteristic value.

4. The mechanical property inspection device according to claim 1, characterized in that: The spectral characteristic value is a second derivative value of the spectral spectrum at an absorption peak wavelength corresponding to the resin material of the molded article.

5. The mechanical property inspection device according to claim 1, wherein: The mechanical property inspection device further includes a pass / fail determination unit configured to determine whether the molded product is a pass / fail product based on a result of estimation of the mechanical property by the mechanical property estimation unit.

6. An injection molding system, characterized in that: include: The mechanical property inspection device according to claim 1; and an injection molding machine for forming the molded product by injection molding, The injection molding machine adjusts injection molding conditions based on the estimation result of the mechanical property by the mechanical property inspection device.

7. The injection molding system according to claim 6, characterized in that The mechanical property estimating unit calculates a mechanical property value corresponding to the spectral characteristic value at each of the measurement points using a calibration curve that indicates a relationship between the mechanical property value indicating a deterioration state of the molded product molded from the resin material and the spectral characteristic value, and calculates an average value of the mechanical property values ​​calculated for each of the measurement points as an average mechanical property of the molded product. The injection molding machine comprises: a hopper into which the resin material and filler are fed; a resin feed amount adjustment unit for adjusting the feed ratio of recycled resin material and new resin material included in the resin material fed into the hopper; a cylinder into which the resin material fed from the hopper is conveyed; and a heating unit for heating the resin material in the cylinder to plasticize the resin material, wherein the injection molding machine adjusts at least one of the feed ratio and the plasticizing temperature generated by the heating unit based on the average mechanical properties.

8. The injection molding system according to claim 6, characterized in that The mechanical property estimating unit calculates a mechanical property value corresponding to the spectral characteristic value at each of the measurement points using a calibration curve that indicates a relationship between the mechanical property value indicating a deterioration state of the molded product molded from the resin material and the spectral characteristic value, and calculates a deviation of the mechanical property value calculated for each of the measurement points as a mechanical property deviation of the molded product. The injection molding machine comprises: a hopper for inputting the resin material; a cylinder to which the resin material input from the hopper is conveyed; a heating unit for heating the resin material in the cylinder to plasticize the resin material; a screw inserted into the cylinder to mix the resin material and capable of adjusting the rotation speed; and an injection unit for pushing out the resin material in the cylinder. The injection molding machine adjusts at least any one of the plasticizing temperature, the rotation speed of the screw, the time for the screw to mix the resin material, and the injection pressure of the injection unit based on the deviation of the mechanical properties.

9. The injection molding system according to claim 6, characterized in that: The injection molding system further includes a foreign matter detection unit configured to detect foreign matter included in the molded product based on the spectral image.

10. The injection molding system according to claim 6, characterized in that The injection molding system further includes a shape inspection unit that inspects a shape of the molded product based on the spectral image.

Images