JP4147967B2 - Assembly determination device and assembly determination method - Google Patents

Description

[0001]
The present invention relates to an assembly determination device and an assembly determination method for determining an assembly state of an article, for example, a fitting state, based on an assembly sound generated when the article is assembled .
[0002]
[Prior art]
Conventionally, in order to assemble an article efficiently, each article to be assembled is provided with a plurality of snap-fit mechanisms composed of a hole portion and a claw portion, and these holes and the claw portion are fitted at the time of assembly. Both articles were assembled and fixed (see Patent Document 1).
[0003]
[Patent Document 1]
Japanese Patent No. 3256972 [0004]
[Problems to be solved by the invention]
However, since both articles are assembled using a plurality of snap-fit mechanisms, variations occur in the assembled state due to the shape of the hole and claw, the shape and structure of the article, and the force applied when fitting. There are things to do. For this reason, it is necessary to visually check whether all the parts are securely fitted, which is very troublesome. In addition, when automating the assembly, the confirmation work may be an obstacle.
[0005]
The present invention has been made in view of the above points, and is a set capable of determining a fitting state of a snap-fit mechanism provided on an article based on an assembly sound, so that a confirmation work at the time of assembly can be made efficient. An object is to provide an attachment determination device and an assembly determination method.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the assembly includes a determination device that detects an assembly sound generated when the first and second articles are assembled and determines an assembly state of the first and second articles. As the determination device, the first article has a plurality of holes forming a snap-fit mechanism, and an elastically deformable portion is formed at a position where the plurality of holes are divided, and the second article The article is formed with a plurality of claw portions constituting the snap-fit mechanism, and the determination device is configured such that the first article is elastically deformed around the elastically deformable portion. The plurality of hole portions when the plurality of hole portions divided on one side with the elastically deformable portion as a boundary and the plurality of hole portions divided on the other side are fitted at different times And the fitting sound between the plurality of claws as the assembly sound Was be detected is determined.
[0007]
In the above configuration as the assembly determination device, the fitting state of the snap fit mechanism provided on the article can be determined based on the assembly sound, and the confirmation work at the time of assembly can be made efficient. In addition, the fitting sound can be extracted at different timings for each fitting portion, and the number of overlapping sound pressure signals in a specific frequency band can be suppressed, so that the accuracy of fitting sound determination can be improved. Become.
[0008]
According to the invention described in claim 2, the determination device detects an assembly sound generated when the first and second articles are assembled, and frequency-separates the assembly sound into a predetermined frequency band. By determining the assembly state of the first and second articles based on a certain time-series signal, it is possible to detect sound in a specific frequency band generated at the time of assembly, and to determine the accuracy of assembly sound. It becomes possible to improve.
[0009]
In the configuration according to claim 1 or 2, in the invention according to claim 3, for example, the second article has a plurality of guide portions formed in the vicinity of the plurality of claw portions, and the plurality of the plurality of guide portions are formed. The hole portion is guided to the claw portion by the guide portion when the first and second articles are assembled. Thereby, the assembly | attachment attitude | position of both articles | goods can be stabilized and the determination precision of the fitting sound at the time of an assembly | attachment can be improved.
[0010]
In the configuration according to any one of claims 1 to 3, for example, in the invention according to claim 4, the wall portion between the plurality of claws is removed from the second article. In addition, a gap is formed to suppress reverberation sound or resonance sound when the first and second articles are assembled. Thereby, when assembling both articles | goods, it becomes possible to make it difficult to generate | occur | produce sounds other than a fitting sound, for example, a reverberation sound and a resonance sound, and it becomes possible to improve the determination precision of the fitting sound at the time of an assembly | attachment.
[0011]
In the configuration according to any one of claims 1 to 4, for example, as in the invention according to claim 5, the plurality of claw portions are fitted together with the plurality of claw portions and the plurality of hole portions. At least one of the material and the shape may be different from each other so that fitting sounds with different frequencies are generated from the fitting portions.
Furthermore, in the configuration according to any one of the first to fifth aspects, for example, as in the invention according to the sixth aspect, the plurality of hole portions includes a plurality of hole portions and a plurality of claw portions. At least one of the material and the shape may be different from each other so that a fitting sound having a different frequency is generated from each fitting portion during fitting.
According to the configuration of the fifth or sixth aspect, since different frequencies are used for each fitting portion and the sound pressure signals do not overlap in a specific frequency band, it is necessary to determine the number of overlapping fitting sounds. It is possible to improve the determination accuracy.
[0012]
In the configuration according to any one of claims 1 to 6, for example, in the invention according to claim 7, the assembly determination device generates the assembly sound generated when the first and second articles are assembled. Sound input means for detecting and inputting sound, and sound generation means for generating sound toward the sound input means, wherein the determination device includes a plurality of types of fitting sound information for checking a threshold used for sound determination. And a threshold value table means for storing the threshold value, and the determination device is a plurality based on the fitting sound information stored in the storage device when the determination function is checked. It is desirable to generate a type of fitting sound from the sound generating means and determine whether the determination function including the threshold value table means is good or not based on sound information detected and input by the sound input means. As a result, the function for reproducing and storing the fitting sound information corresponding to the actual assembly sound is provided in the same assembly determination device, thereby integrating the system for confirming the determination operation. Processing and normal determination operations can be performed continuously.
[0013]
On the other hand, in order to achieve the above object, in the invention according to claim 8, an assembly sound generated when the first and second articles are assembled is detected, and the assembled state of the first and second articles is detected. As a method for determining assembly, the first article has a plurality of holes forming a snap-fit mechanism, and a portion that can be elastically deformed at a position dividing the plurality of holes. The second article has a plurality of claw portions forming the snap-fit mechanism, and the first article is elastically deformed around the elastically deformable portion. Timing at which the plurality of holes and the claw sections divided on one side with the deformable portion as a boundary, and the plurality of hole sections and the plurality of claw sections divided on the other side Mating with different timing of mating Allowed, and the fitting sound with these plurality of holes and the plurality of claw portions and to detect and determine, as the assembling sound.
[0014]
In the above method as the assembly determination method, the fitting state of the snap fit mechanism provided on the article can be determined based on the assembly sound, and the confirmation work at the time of assembly can be made efficient. In addition, the fitting sound can be extracted at different timings for each fitting portion, and the number of overlapping sound pressure signals in a specific frequency band can be suppressed, so that the accuracy of fitting sound determination can be improved. Become.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
[0017]
(First embodiment)
FIG. 1 shows an overall configuration of an assembly determination apparatus common to each embodiment of the present invention, and shows an example in which the present invention is used for assembly determination of a pump cover and a filter case, for example.
[0018]
Here, as an object 1, in this example, automatic assembly of resin molded parts, particularly as an example in which a loud sound is generated during assembly, a plurality of snap-fit mechanisms as shown in a broken line frame 1A in FIG. An example of sound generation from the work process of assembling the parts 110 and 120 as the first and second articles by the assembling equipment or the like is given. A state in which the claw portions 104 provided in the plurality of fitting portions 103 in the bottomed cylindrical lower lid component 120 are fitted in the hole portions 102 formed in the plurality of fitting portions 101 in the bottomed cylindrical upper lid component 110. Is shown. In this case, the lower lid component 120 is inserted into the upper lid component 110, and the respective claw portions 104 are fitted into the respective hole portions 102 almost simultaneously and are fixed by the snap-fit mechanism.
[0019]
2A, 2B, and 2C are examples of sound waves (sound pressure signals) that are generated when the two parts 110 and 120 are assembled. FIG. 2A illustrates the assembly operation state, and FIG. ) Shows an assembly sound pressure signal when assembly is good, and (c) shows an assembly sound pressure signal when assembly is poor. As can be seen from the signal level of the assembly sound in FIGS. 2B and 2C, the sound pressure level of the fitting sound changes according to the quality of the assembly.
[0020]
As a characteristic of sound generation at the time of assembly, it conveys the machine operation sound (including reverberation sound or resonance sound from the equipment and parts) and the mating situation due to the movement of the assembly equipment and the contact of the fitting parts. A fitting sound is generated, and both sounds have sound pressure levels corresponding to the shape, material, component assembly speed, etc., and the sound pressure levels of both sounds change in correlation with each other.
[0021]
The microphone 2 detects a sound wave generated in the object 1 for assembly sound determination and converts it into an electrical signal. The sound pressure electrical signal input from the microphone 2 is input to the amplifier 3 of the assembly determination apparatus 100 and output to the A / D converter 4. The A / D converter 4 converts the sound pressure signal into a digital signal, which is output to the storage device 5 at the subsequent stage for storage processing.
[0022]
The wavelet transform computing unit 6 constitutes frequency separation means, takes in the digital sound pressure signal S0 (see FIG. 3 (a)) stored in the storage device 5 at a predetermined timing, and this digital sound. The pressure signal S0 is separated for each frequency band set in advance based on the fitting sound to be determined, and converted into a time-series signal S1 (see FIG. 3B). In general, the wavelet transform computing unit 6 is a computing unit that separates the digital sound pressure signal S0 into time-series signals for each frequency band by enlarging or reducing the basis function (wavelet function). In this example, a frequency band is set as an assembly sound in accordance with a fitting sound generated from one or more snap-fit mechanisms. This frequency band is composed of a set band of one or a plurality of frequency bands, depending on the characteristics of the target fitting sound.
[0023]
The signal processing means 7 includes a filter processor 71, a corrector 72, and a correction coefficient setting means 73, and reduces or cuts a signal in a frequency band other than the fitting sound from a time series signal for each predetermined frequency band, A frequency band with less noise among the fitting sounds is amplified to improve the S / N ratio and output as a time-series signal S2 (see FIG. 3C).
[0024]
In the example of FIG. 3, the sampling frequency of the digital sound pressure signal S0 is 44 KHz, and among the first frequency bands, the frequency band 11 is 11 to 22 KHz, the frequency band 10 is 5.5 to 11 KHz, and the frequency band 9 is 2.8. The fitting sound is noticeable at ~ 5.5KHz. In addition, the mechanical operating sound appears in frequency bands 8 to 6 below 2.8 KHz, and in this case, it can be seen that separation is possible by distinguishing data for each frequency band.
[0025]
Note that the filter processor 7 is omitted, and the time-series signal S1 of the wavelet transform computing unit 6 is supplied to the corrector 10 described later, and for each predetermined frequency band supplied to the corrector 10 from the correction coefficient setting means 73. By devising the correction coefficient, it is possible to reduce or cut a signal in a frequency band other than the fitting sound. The correction coefficient setting means 73 selects a correction coefficient (or correction amount or gain) to be given to the corrector 72 according to the shape, material and property of the resin molded part to be assembled and fitted.
[0026]
The determination device 8 constitutes a part of the determination device, and even when each fitting sound generated from a plurality of fitting points in the object 1 overlaps or continues on the time axis, all fittings are performed. It is necessary to determine whether or not a fitting sound is generated from the joint point. Therefore, the reference value of the sound pressure signal determined by the sound pressure signal level of the fitting operation sound when all the fitting points overlap, or the reference value of the sound pressure signal determined by the sound pressure signal level and the generation period thereof (this The volume equivalent value obtained by adding the area equivalent value of the product of the sound pressure signal level and the generation period for each predetermined frequency (so-called volume equivalent value) is obtained in advance and set and stored in the threshold table 9 as the threshold value L. In order to determine the fitting state at a plurality of locations, it is possible to improve the determination accuracy by using an area equivalent value considering the occurrence period, more preferably a volume equivalent value considering the fitting sound volume in a plurality of frequency bands.
[0027]
As an example of the determiner 8, when the fitting sound exists in the time series signal S2 portion for each frequency band generated by the corrector 72 or in a plurality of frequency bands, each time series signal S2 portion By determining the total value of the area equivalent values (volume equivalent value) and comparing the value with the threshold value L, it is determined whether the parts are assembled (fitted). Based on the determination result, the determination unit 8 displays the result on the display unit 10, and outputs the alarm to the alarm unit 11 if it fails.
[0028]
Next, in order to improve the determination accuracy of the fitting sound at the time of assembly in the present invention, it is possible to reduce sounds other than the fitting sound generated from the parts 110 and 120 which are the determination targets, It is desirable to reduce the number of overlaps. Hereinafter, implementation examples thereof will be described with reference to second to fifth embodiments.
[0029]
(Second Embodiment)
4A shows a state before assembly, and FIG. 4B shows a state during assembly. As shown in the figure, this example is provided with a guide portion 105 that guides the fitting portion 101 of the component 110 from one end portion of the component 120 to the claw portion 104 when the both components 110 and 120 are assembled. The guide part 105 is formed in the vicinity of the claw part 104 so as to sandwich the claw part 104, and is substantially in contact with both side ends of the fitting part 101 to regulate the movement of the component 110 in the radial direction and the circumferential direction. Guide in the direction. In this example, since there are three fitting portions 101 and 103 each, a total of six guide portions 105 are resin-molded integrally with the component 120 on the outer peripheral surface of the cylindrical lower lid component 120.
[0030]
Thereby, the assembly | attachment attitude | position of both the components 110 and 120 can be stabilized, and the determination precision of the fitting sound at the time of an assembly | attachment can be improved.
[0031]
(Third embodiment)
5A shows a state before assembly, FIG. 5B shows a state after assembly, and FIG. 5C shows a state of sound generation during assembly. As shown in the figure, in this example, gap portions 106 and 107 are provided in the vicinity of the fitting portions 101 and 103 of both parts 110 and 120, respectively. The gap portions 106 and 107 are formed by removing the outer wall portion of the cylindrical component 110 or 120 between the fitting portions 101 or 103.
[0032]
Thereby, when assembling both the parts 110 and 120, it becomes possible to make it difficult to generate sounds other than the fitting sound as shown in FIG. It is possible to improve the accuracy of determining the sound mixture.
[0033]
(Fourth embodiment)
In this example, the frequency bands f of the fitting sounds generated from the fitting portions 101 and 103 are made different from each other when the parts 110 and 120 are assembled.
[0034]
FIG. 6 shows fitting parts 101a to 101c and 103a to 103c in which the materials and / or shapes of the fitting parts 101 and 103 are different from each other. FIG. 3 is an explanatory diagram for setting fitting noise in the frequency band f2 between the fitting portions 101b and 103b and fitting noise in the frequency band f3 between the fitting portions 101c and 103c and generating fitting sounds in different frequency bands. is there. FIG. 6 shows that the sound pressure signals in the respective frequency bands f1 to f3 when the non-defective product is fitted (that is, all three locations are well fitted) and the poorly fitting parts are different (patterns 1 to 3). The sound pressure signals in the frequency bands f1 to f3 (one place in this case is poorly fitted) are shown in three dimensions (time-frequency-sound pressure level).
[0035]
Accordingly, by changing the material or shape of at least one of the fitting parts 101 and 103 to be assembled for each fitting part to be assembled, a different frequency is set for each fitting part, and the sound pressure signal is in a specific frequency band. Since they do not overlap, it is not necessary to determine the number of mating sound overlaps, and the determination accuracy can be improved.
[0036]
(Fifth embodiment)
In this example, when assembling both the parts 110 and 120, the number of locations to be fitted simultaneously is set to a predetermined number (for example, 3 or less), and the determination accuracy is maintained or improved by suppressing the number of overlapping overlapping sounds. It is a thing.
[0037]
FIG. 7A is an explanatory diagram illustrating an assembly process in which the upper lid component 110 is fitted into the lower lid component 120 in two stages, and FIG. 7B is an explanatory diagram illustrating a fitting sound generated during the assembly. It is. In this example, the groove portion 108 is formed so as to cross the part 110 as an elasticity applying portion at a position where the fitting portion is divided every three portions, and the groove portion 108 is formed between the divided A portion and B portion. The center is elastically deformable.
[0038]
When assembling both the parts 110 and 120, first, the parts 110 are elastically deformed in the groove part 108, the three fitting parts 101A and 103A in the part A are first fitted, and then a predetermined interval. The three fitting parts 101B and 103B in the B part are fitted with (time interval). Accordingly, as shown in FIG. 7B, the fitting sound of the A part and the fitting sound of the B part can be detected as sound pressure signals in a distinguishable state on the time axis.
[0039]
As a result, the fitting sound can be taken out at different timings for each of the fitting parts A and B, and the number of overlapping sound pressure signals in a specific frequency band can be suppressed. It becomes possible to improve.
[0040]
In the above second to fifth embodiments, the sounds other than the fitting sound generated from the parts 110 and 120 themselves are reduced or the number of overlapping fitting sounds is reduced. The example which reduces sounds other than a fitting sound by the above etc. is demonstrated.
[0041]
(Sixth embodiment)
FIG. 8A is a top view of the jig 130, and FIG. 8B is an explanatory view showing an assembled state of the parts 110 and 120. In this example, when assembling both parts 110 and 120, both parts 110 and 120 are held and fitted to jigs 130 and 140, respectively, and through holes 131 and 141 are provided in jigs 130 and 140. The fitting sound is resonated and the reverberation sound or resonance sound is released to the outside.
[0042]
The jigs 130 and 140 are shown only for the main parts, but hold the parts 110 and 120 by a suction mechanism and a gripping mechanism (not shown), and at least penetrate the parts 110 and 120 directly. Holes 131 and 141 are opened.
[0043]
Thereby, when assembling both the parts 110 and 120, since the S / N ratio of the fitting sound can be increased with respect to the reverberant sound or resonance sound that accompanies, the determination accuracy of the fitting sound can be improved. It becomes possible.
[0044]
(Seventh embodiment)
In this example, a confirmation unit for confirming whether the assembly determination apparatus 100 is normally performing a determination operation is incorporated in the determination apparatus 100 so as to improve the confirmation accuracy.
[0045]
In FIG. 9, the control apparatus 200 has a confirmation processing means for self-diagnosis of the determination operation of the determination processing means in addition to the fitting sound determination processing means shown in FIG. The speaker 300 generates a pseudo assembly sound corresponding to the actual assembly sound toward the microphone 2. The input device 400 is a device for inputting incidental information necessary for the determination process of the fitting sound or inputting information necessary for the self-diagnosis of the determination operation of the determination processing means to the control device 200. The output switching device 210 performs an operation of selecting sound information to be given to the speaker 300 during the confirmation process in accordance with an instruction from the control device 200.
[0046]
The storage device 220 is constituted by a part of the storage device 5 shown in FIG. 1, and a part of the plurality of fitting portions of the parts 110 and 120 is fitted as a pseudo assembly sound corresponding to the actual assembly sound. The first memory 221 in which the defective fitting sound (NG sound) when not matched is stored in advance, and the non-defective fitting sound (OK sound) when all of the plurality of fitting portions are properly fitted are stored in advance. The second memory 222 and all of the plurality of fitting portions are fitted well, and non-defective fitting sound (superimposed sound) when echo sound or resonance sound equivalent generated during assembly is superimposed is stored in advance. The third memory 223 is configured.
[0047]
The input switching device 230 gives the sound information detected by the microphone 2 to the control device 200 during the confirmation process, and on the other hand, when storing the pseudo assembly sound corresponding to the actual assembly sound, this pseudo test is performed on a trial basis. In response to an instruction from the control device 200, a selective operation is performed so that a target assembly sound is generated and given to the storage device 220 via the microphone 2.
[0048]
According to the above configuration, at the time of confirmation processing (self-diagnosis of the determination operation of the determination processing means), the control device 200 causes the switching devices 210 and 230 to select, for example, the position of the solid line and outputs the OK sound stored in the second memory 222. Generated from the speaker 300. The control device 200 detects an OK sound (digital sound pressure signal) input via the amplifier 3 and the A / D converter 4 and compares it with a threshold value L set in the threshold value table 9 to determine whether the assembly is good or bad. judge. At this time, if it is determined to be defective despite the OK sound, it can be estimated that the determination processing means has a problem. In this confirmation process, at least three types of NG sound, OK sound, and superimposed sound are performed, and comprehensive inspection and adjustment operations are performed.
[0049]
On the other hand, when storing the pseudo assembly sound corresponding to the actual assembly sound, the control device 200 causes the switching devices 210 and 230 to select, for example, the position of the broken line, and illustrates the NG sound, the OK sound, and the superimposed sound. It is generated from an assembly facility that is not installed, and is stored in the memories 221 to 223 sequentially. At that time, in consideration of the sound pressure level detected by the microphone 2 during sound reproduction, the information on the angle between the speaker 300 and the microphone 2 and the distance information between the speaker 300 and the microphone 2 are also stored in the memories 221 to 223. When stored, sound playback with an increased S / N becomes possible.
[0050]
Accordingly, in this example, the function for reproducing and recording the pseudo assembly sound corresponding to the actual assembly sound is provided in the same assembly determination device, so that the confirmation processing (the self-diagnosis of the determination operation of the determination processing means) is performed. ) Can be integrated, and the confirmation process and the normal determination operation can be performed continuously (synchronized). In addition, both processes use the common microphone 2 and detection processing means 3 and 4 and can confirm the pseudo imposition sound information stored using these, so that the detection standard such as the sound pressure level can be stabilized, and S The / N ratio is increased so that the assembly quality can be judged with higher accuracy.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing an overall configuration of an assembly determination apparatus according to a first embodiment of the present invention.
FIGS. 2A and 2B are explanatory views showing a main part of a part assembling process, and FIGS. 2B and 2C are diagrams showing sound pressure waveforms detected in the part assembling process. FIGS.
FIG. 3 is a signal waveform diagram of the assembly determination apparatus 100 shown in FIG. 1;
FIGS. 4A and 4B show a second embodiment of the present invention, in which FIG. 4A is an explanatory view showing a state before assembly, and FIG.
FIGS. 5A and 5B show a third embodiment of the present invention, FIG. 5A is an explanatory diagram showing a state before assembly, FIG. 5B is an explanatory diagram showing a state after assembly, and FIG. It is a pressure wave form diagram.
FIG. 6 is an explanatory diagram showing a fourth embodiment of the present invention.
FIGS. 7A and 7B show a fifth embodiment of the present invention, FIG. 7A is an explanatory diagram showing an assembly process, and FIG. 7B is a sound pressure waveform diagram of an assembly sound at the time of assembly;
FIGS. 8A and 8B show a sixth embodiment of the present invention, in which FIG. 8A is a top view of a holding jig, and FIG.
FIG. 9 is a configuration diagram showing a seventh embodiment of the present invention.
[Explanation of symbols]
1 Object 2 Microphone (sound input means)
5 Storage Device 6 Wavelet Transform Operation Unit 7 Signal Processing Means 8 Determinator (Part of Determination Device)
9 Threshold table 101, 103 Fitting part 102 Hole part 104 Claw part 105 Guide part 106, 107 Gap part 108 Groove part 110 First part (first article)
120 Second part (second article)
130, 140 Jig 131, 141 Through hole 200 Control device 220 Storage device

Claims (8)

An assembly determination device comprising a determination device that detects assembly sounds generated when the first and second articles are assembled and determines an assembly state of the first and second articles,
In the first article, a plurality of hole portions constituting a snap-fit mechanism are formed, and a portion that can be elastically deformed is formed at a position dividing the plurality of hole portions,
The second article is formed with a plurality of claws that constitute the snap-fit mechanism,
The determination device is configured such that the first article is elastically deformed with the elastically deformable portion as a center, and the plurality of hole portions and the other side divided on one side with the elastically deformable portion as a boundary. Detecting and determining the fitting sound between the plurality of hole portions and the plurality of claw portions as the assembly sound when the plurality of hole portions classified into two are fitted at different times. An assembly determination device characterized by the above.   The determination device detects an assembly sound generated when the first and second articles are assembled, frequency-separates the assembly sound, and based on a time-series signal in a predetermined frequency band, The assembly determination apparatus according to claim 1, wherein the assembly state of the first and second articles is determined. In the second article, a plurality of guide portions are formed in the vicinity of the plurality of claw portions,
3. The assembly determination apparatus according to claim 1, wherein the plurality of hole portions are guided to the claw portion by the guide portion when the first and second articles are assembled. In the second article, a wall portion between the plurality of claws is removed, thereby forming a gap portion for suppressing reverberation sound or resonance sound when the first and second articles are assembled. The assembly determination apparatus according to any one of claims 1 to 3, wherein the assembly determination apparatus is configured. The plurality of claw portions are different in at least one of material and shape so that a fitting sound of a different frequency is generated from each fitting portion when the plurality of claw portions and the plurality of hole portions are fitted. The assembly determination apparatus according to any one of claims 1 to 4, wherein the assembly determination apparatus according to any one of claims 1 to 4 is provided. The plurality of hole portions are different in at least one of material and shape so that a fitting sound with a different frequency is generated from each fitting portion when the plurality of hole portions and the plurality of claw portions are fitted. The assembly determination device according to claim 1, wherein the assembly determination device is an assembly determination device. The assembly determination apparatus includes sound input means for detecting and inputting the assembly sound generated when the first and second articles are assembled, and sound generation means for generating sound toward the sound input means. In addition,
The determination device further includes a storage device storing a plurality of types of fitting sound information for checking a threshold value used for sound determination, and a threshold value table unit storing the threshold value,
The determination device generates a plurality of types of fitting sounds from the sound generation means based on the fitting sound information stored in the storage device and checks and inputs the sound input means when the determination function is checked. 7. The assembly determination apparatus according to claim 1, wherein the determination function including the threshold value table unit is determined based on the sound information obtained. An assembly determination method for detecting assembly sound generated when the first and second articles are assembled, and determining an assembly state of the first and second articles,
In the first article, a plurality of hole portions constituting a snap-fit mechanism are formed, and a portion that can be elastically deformed is formed at a position that divides the plurality of hole portions,
The second article is formed with a plurality of claws that constitute the snap-fit mechanism,
By elastically deforming the first article around the elastically deformable portion, the plurality of hole portions and the plurality of claw portions divided on one side with the elastically deformable portion as a boundary are fitted. And the plurality of hole portions and the plurality of claws are fitted with different timings when the plurality of hole portions and the plurality of claw portions divided on the other side are fitted. An assembly determination method, wherein a fitting sound with a part is detected and determined as the assembly sound.

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