Welding quality detection method and system for capacitor product

Abstract

The invention discloses a welding quality detection method for capacitor products. The welding quality detection method comprises the following steps of S1, sorting to-be-detected capacitor products in batches; s2, the capacitor products to be detected after batch sorting are distributed and placed in an array mode; s3, the conveying device sequentially conveys the to-be-detected capacitor products which are distributed and placed in an array mode into a scaling powder liquid tank, a tin furnace and a six-face external detection machine according to a set program; s4, acquiring image data of the to-be-detected capacitor product through the six-surface external detection machine; s5, analyzing according to the image data to obtain the tinning rate of each surface of the capacitor product to be detected and the cracking condition of a porcelain body; and S6, if the tinning rate of each surface of the capacitor product to be detected is greater than 95% and the porcelain body is not cracked, determining that the capacitor product to be detected is qualified. The invention further discloses a welding quality detection system for the capacitor product. According to the invention, batch welding quality detection can be simultaneously carried out on a plurality of products, the automation degree and the working efficiency can be improved, the detection and determination consistency is high, and the accuracy is high.

Description

Technical Field

[0001] The present invention relates to the field of MLCC technology, and in particular to a welding quality detection method and a detection method for capacitor products. Background Art

[0002] At present, with the rapid development of electronic information technology, multilayer ceramic capacitors (MLCC) are indispensable components in modern electronic devices, and their quality requirements are becoming increasingly stringent. As a reliability test for products, the existing MLCC product solderability / resistance test method is mainly for operators to manually use metal tweezers to pick up the capacitor product and soak it in a tin furnace (tin furnace temperature: 245 / 275℃, tinning time: 5±0.5S), and then use a stereo microscope to perform an appearance inspection to see if the tin rate on the end of the capacitor product and the cracking of the porcelain body meet the requirements. The main disadvantages of the above scheme are: since the operator manually performs an immersion test on each product and visually inspects the 6 sides of each product, the overall inspection process will be time-consuming and inefficient; at the same time, since the judgment standard of the tin rate on the end is determined by the operator's visual judgment, the difference in individual judgment of the operator makes the appearance inspection judgment have the risk of misjudgment, which restricts the improvement of product reliability quality and cost control. Summary of the invention

[0003] The purpose of the present invention is to provide a welding quality detection method and system for capacitor products, which can simultaneously perform welding quality detection on multiple product batches, improve the degree of automation and work efficiency, and have the advantages of high consistency and high accuracy in inspection and judgment.

[0004] In order to achieve the above object, the technical solution adopted in one aspect of the present invention is:

[0005] A welding quality detection method for capacitor products comprises the following steps:

[0006] Step S1: Batch sorting of capacitor products to be tested;

[0007] Step S2: placing the capacitor products to be tested after batch sorting in an array;

[0008] Step S3: The conveying device delivers the capacitor products to be tested, which are arranged in an array, to the flux tank, the tin furnace and the six-sided external inspection machine in sequence according to the set program;

[0009] Step S4: obtaining image data of the capacitor product to be inspected by the six-surface inspection machine;

[0010] Step S5: Analyze the image data to obtain the tinning rate of each surface of the capacitor product to be tested and the cracking of the porcelain body;

[0011] Step S6: If the tinning rate of each surface of the capacitor product to be tested is greater than 95% and the ceramic body is not cracked, it is qualified.

[0012] As a preferred solution of the above-mentioned welding quality inspection method for capacitor products, it also includes step S7: re-welding the unqualified capacitor products in step S6 and then sending them to the six-sided external inspection machine, repeating the operations of steps S2 to S5 until the capacitor products are inspected and qualified.

[0013] As a preferred embodiment of the above-mentioned welding quality inspection method for capacitor products, in step S4, when the capacitor product is subjected to solderability inspection, the six-sided external inspection machine obtains image data of the capacitor product to be inspected after being coated with flux and immersed in a tin furnace at 245°C for 5±0.5s.

[0014] As a preferred embodiment of the above-mentioned welding quality inspection method for capacitor products, in step S4, when the capacitor product is subjected to solderability inspection, the six-sided external inspection machine obtains image data of the capacitor product to be inspected after being coated with flux and immersed in a tin furnace at 275°C for 5±0.5s.

[0015] In addition, in order to achieve the above object, another aspect of the present invention adopts the following technical solution:

[0016] A welding quality inspection system for capacitor products, comprising a conveying device and a capacitor product sorting device, a flux tank, a tin furnace and a six-sided external inspection machine arranged in sequence along a material transport direction;

[0017] The capacitor product sorting device is used to sort capacitor products to be tested in batches, and can arrange the capacitors to be tested in an array-like distribution;

[0018] The flux tank is loaded with flux, which is used to coat the capacitor products to be tested that are arranged in an array.

[0019] The tin furnace is used to perform soldering on the capacitor product to be tested after being coated with solder flux;

[0020] The six-surface inspection machine is used to obtain image data of each surface of the capacitor product to be inspected after welding;

[0021] The conveying device is used to sequentially convey the capacitor products to be inspected that are arranged in an array to the flux tank, the tin furnace and the six-sided external inspection machine.

[0022] As a preferred solution of the above-mentioned welding quality detection system for capacitor products, the capacitor product sorting device includes a sorting jig and a distribution jig.

[0023] As a preferred embodiment of the welding quality inspection system for capacitor products, the sorting jig comprises a first screen layer and a second screen layer arranged in parallel up and down, the screen holes of the first screen layer and the screen holes of the second screen layer are staggered, the screen hole diameter of the first screen layer is the same as the screen hole diameter of the second screen layer, the screen hole diameter of the first screen layer and the screen hole diameter of the second screen layer are both greater than or equal to d and less than 2d, d is the short axis length of a single capacitor product; the distance between the first screen layer and the second screen layer is less than 2L, L is the long axis length of a single capacitor product.

[0024] As a preferred solution of the above-mentioned welding quality inspection system for capacitor products, the distribution jig includes a base plate and an introduction plate, the introduction plate is detachably connected to the top of the base plate, and a plurality of capacitor positioning holes arranged in an array are provided on the introduction plate.

[0025] As a preferred solution of the above-mentioned welding quality inspection system for capacitor products, the conveying device includes a top frame, a three-dimensional moving mechanism and a manipulator clamp for clamping the capacitor product to be inspected, and the manipulator clamp is installed on the top frame through the three-dimensional moving mechanism.

[0026] As a preferred solution of the above-mentioned welding quality inspection system for capacitor products, it also includes a carrier for placing the base plate, and the carrier, the flux tank and the tin furnace are arranged in sequence below the conveying device; a calibration area for calibrating the position of the base plate is provided on the carrier.

[0027] The method and system for detecting welding quality of capacitor products provided by the present invention have the following beneficial effects compared with the prior art:

[0028] (1) The welding quality inspection method for capacitor products of the present invention uses six CCD cameras in a six-surface inspection machine to respectively photograph the appearance of the six surfaces of the capacitor product to be inspected, and obtains the tinning rate and porcelain cracking condition of each surface of the capacitor product to be inspected through image data analysis, thereby inspecting whether the welding quality of the capacitor product is qualified. Compared with the inspection method of manual operation and naked eye observation of a single capacitor product in the prior art, the welding quality inspection (i.e., weldability inspection or solder resistance inspection) can be performed on multiple batches of products at the same time, which can improve the degree of automation and work efficiency, and has the advantages of high consistency and high accuracy in inspection and judgment.

[0029] (2) When the welding quality inspection system for capacitor products of the present invention is working, firstly, the capacitor product sorting device is used to sort the capacitor products to be inspected in batches, and the capacitor products to be inspected are arranged in an array; then, the conveying device extracts the capacitor products to be inspected arranged in an array and immerses them in a flux liquid tank, and the surface of the capacitor products to be inspected is covered with flux; then, the conveying device sends the capacitor products to be inspected after being coated with flux to a tin furnace, and performs welding treatment on the capacitor products to be inspected through the tin furnace; finally, the conveying device sends the capacitor products to be inspected after welding to a six-sided external inspection machine for welding quality inspection (i.e., weldability inspection or solder resistance inspection). Compared with the inspection method of manual operation and naked eye observation of a single capacitor product in the prior art, the welding quality inspection of multiple products in batches can be performed at the same time, the inspection process can be simplified, the degree of automation and work efficiency can be improved, and it has the advantages of high consistency and high accuracy in inspection and judgment. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings of the embodiment are briefly introduced below.

[0031] Figure 1 It is a structural schematic diagram of a welding quality detection system for capacitor products provided by an embodiment of the present invention;

[0032] Figure 2 It is a structural schematic diagram of the sorting fixture;

[0033] Figure 3 It is a structural diagram of a capacitor product connected to a long axis;

[0034] Figure 4 It is a schematic diagram of the structure of the capacitor product connected to the short axis;

[0035] Figure 5 It is a structural diagram of a distribution fixture.

[0036] Markings in the figure:

[0037] 1. Conveying device; 11. Top frame; 12. Three-dimensional moving mechanism; 13. Robot clamp; 21. Sorting fixture; 211. First screen layer; 212. Second screen layer; 22. Distribution fixture; 221. Bottom plate; 222. Lead-in plate; 222a. Capacitor positioning hole; 3. Flux tank; 4. Tin furnace; 5. Six-sided external inspection machine; 6. Carrier; 7. Capacitor product to be tested (normal capacitor product); 8. Capacitor product connected with long axis; 9. Capacitor product connected with short axis. DETAILED DESCRIPTION

[0038] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0039] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. It should be understood that the terms "first", "second", etc. are used in the present invention to describe various information, but such information should not be limited to these terms, which are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information.

[0040] One aspect of a preferred embodiment of the present invention provides a welding quality detection method for capacitor products, which comprises the following steps:

[0041] Step S1: Batch sorting of capacitor products 7 to be tested.

[0042] Step S2: placing the capacitor products to be tested 7 after batch sorting in an array.

[0043] Step S3: the conveying device 1 conveys the capacitor products 7 to be inspected, which are arranged in an array, to the flux tank 3, the tin furnace 4 and the six-side external inspection machine 5 in sequence according to the set program.

[0044] Step S4: Obtain image data of the capacitor product 7 to be inspected through the six-sided external inspection machine 5; wherein, when the capacitor product is subjected to solderability inspection, the six-sided external inspection machine 5 obtains image data of the capacitor product 7 to be inspected after being coated with flux and immersed in a tin furnace 4 at 245°C for 5±0.5s; when the capacitor product is subjected to solderability inspection, the six-sided external inspection machine 5 obtains image data of the capacitor product 7 to be inspected after being coated with flux and immersed in a tin furnace 4 at 275°C for 5±0.5s.

[0045] Step S5: Analyze the image data to obtain the tinning rate of each surface of the capacitor product 7 to be tested and the cracking of the ceramic body;

[0046] Step S6: If the tinning rate of each surface of the capacitor product 7 to be tested is greater than 95% and the ceramic body is not cracked, it is qualified.

[0047] According to the welding quality inspection method of the capacitor product of the present embodiment, when working, the six CCD cameras in the six-sided external inspection machine 5 respectively shoot the appearance of the six sides of the capacitor product 7 to be inspected, and the tinning rate and porcelain cracking condition of each side of the capacitor product 7 to be inspected are obtained through image data analysis, thereby inspecting whether the welding quality of the capacitor product is qualified. Compared with the inspection method of manual operation and naked eye observation of a single capacitor product in the prior art, the welding quality inspection (that is, weldability inspection or solder resistance inspection) can be performed on multiple product batches at the same time, which can improve the degree of automation and work efficiency, and has the advantages of high consistency and high accuracy of inspection and judgment.

[0048] Exemplarily, this embodiment also includes step S7: re-welding the unqualified capacitor product in step S6 and then sending it to the six-sided external inspection machine 5, repeating the operations of steps S2 to S5 until the capacitor product passes the inspection.

[0049] Also, see Figures 1 to 5 Another aspect of the preferred embodiment of the present invention provides a welding quality inspection system for capacitor products, which includes a conveying device 1 and a capacitor product sorting device, a flux tank 3, a tin furnace 4 and a six-sided external inspection machine 5 arranged in sequence along the material transportation direction.

[0050] The capacitor product sorting device is used to sort the capacitor products 7 to be tested in batches, and can arrange the capacitors to be tested in an array-like distribution.

[0051] The flux tank 3 is loaded with flux for coating the capacitor products 7 to be tested that are arranged in an array.

[0052] The tin furnace 4 is used to perform soldering on the capacitor product 7 to be tested after being coated with solder flux.

[0053] The six-surface inspection machine 5 is used to obtain image data of each surface of the capacitor product 7 to be inspected after welding.

[0054] The conveying device 1 is used to sequentially convey the capacitor products 7 to be inspected that are arranged in an array to the flux tank 3, the tin furnace 4 and the six-sided external inspection machine 5.

[0055] According to the welding quality inspection system for capacitor products of the present embodiment, when working, firstly, the capacitor products 7 to be inspected are sorted in batches by the capacitor product sorting device, and the capacitors to be inspected are arranged in an array; then, the conveying device 1 extracts the capacitor products 7 to be inspected arranged in an array and immerses them in the flux liquid tank 3, and the surface of the capacitor products to be inspected 7 is covered with flux; then, the conveying device 1 sends the capacitor products to be inspected 7 coated with flux to the tin furnace 4, and performs welding treatment on the capacitor products to be inspected 7 through the tin furnace 4; finally, the conveying device 1 sends the capacitor products to be inspected 7 after welding treatment to the six-sided external inspection machine 5 for welding quality inspection (i.e., weldability inspection or solder resistance inspection). Compared with the inspection method of manual operation and naked eye observation of a single capacitor product in the prior art, the welding quality inspection can be performed on batches of multiple products at the same time, the inspection process can be simplified, the degree of automation and work efficiency can be improved, and it has the advantages of high consistency and high accuracy of inspection and judgment.

[0056] Exemplarily, the conveying device 1 includes a top frame 11, a three-dimensional moving mechanism 12, and a manipulator fixture 13 for clamping the capacitor product 7 to be tested, and the manipulator fixture 13 is installed on the top frame 11 through the three-dimensional moving mechanism 12. It should be noted that the three-dimensional moving mechanism 12 is an existing X-direction moving mechanism, a Y-direction moving mechanism, and a Z-direction moving mechanism, which can realize precise position control of the manipulator fixture 13, thereby ensuring the orderly progress of the detection work.

[0057] Exemplarily, the capacitor product sorting device includes a sorting jig 21 and a distribution jig 22 .

[0058] like Figure 2 As shown, the sorting jig 21 includes a first screen layer 211 and a second screen layer 212 which are arranged in parallel up and down, the screen holes of the first screen layer 211 and the screen holes of the second screen layer 212 are staggered, the screen hole diameter of the first screen layer 211 is the same as the screen hole diameter of the second screen layer 212, the screen hole diameter of the first screen layer 211 and the screen hole diameter of the second screen layer 212 are both greater than or equal to d and less than 2d, and the distance between the first screen layer 211 and the second screen layer 212 is less than 2L. Wherein, d is the short axis length of a single capacitor product or the short axis length of the capacitor product 9 connected by the short axis, and 2d is the short axis length of the capacitor product 8 connected by the long axis; L is the long axis length of a single capacitor product or the long axis length of the capacitor product 8 connected by the long axis, and 2L is the long axis length of the capacitor product 9 connected by the short axis. It should be noted that in the production process of capacitor products, capacitor products are prone to long axis connection (such as Figure 3 as shown) or connected to a short axis (as Figure 4As shown in the figure, therefore, before conducting welding quality inspection, it is necessary to first sort out the capacitor products 8 connected by the long axis and the capacitor products 9 connected by the short axis to obtain normal capacitor products (i.e. capacitor products that are not adhered to other capacitor products). When in use, shake the sorting jig 21. Since the mesh aperture of the first mesh layer 211 in the sorting jig 21 is the same as the mesh aperture of the second mesh layer 212, the mesh aperture of the first mesh layer 211 and the mesh aperture of the second mesh layer 212 are both greater than or equal to the short axis length of a single capacitor product or the short axis length of the capacitor product 9 connected by the short axis, and are smaller than the short axis length of the capacitor product 8 connected by the long axis. Therefore, the capacitor product 9 connected by the short axis and the normal capacitor product can pass through the mesh aperture of the first mesh layer 211, while the capacitor product 8 connected by the long axis can remain on the first mesh layer 211, thereby realizing the screening of the capacitor product 8 connected by the long axis; at the same time, since the first mesh layer The sieve holes of 211 and the sieve holes of the second sieve layer 212 are staggered, and the distance between the first sieve layer 211 and the second sieve layer 212 is smaller than the long axis length of the short-axis connected capacitor product 9. Therefore, when the short-axis connected capacitor product 9 falls from the sieve holes of the first sieve layer 211, it does not have enough room to move back to a vertical state and fall from the sieve holes of the second sieve layer 212. Therefore, the short-axis connected capacitor product 9 will be stuck in the gap formed between the first sieve layer 211 and the second sieve layer 212, and the normal capacitor product will fall from the sieve holes of the second sieve layer 212, thereby achieving the screening of normal capacitor products and short-axis connected capacitor products 9.

[0059] like Figure 5As shown, the distribution jig 22 includes a bottom plate 221 and an introduction plate 222, the introduction plate 222 is detachably connected to the top of the bottom plate 221, and the introduction plate 222 is provided with a plurality of capacitor positioning holes 222a arranged in an array. Before welding quality inspection, the introduction plate 222 is installed on the top of the bottom plate 221, and the sorted capacitor products to be inspected 7 (i.e., the normal capacitor products mentioned above) are placed on the capacitor positioning holes 222a of the introduction plate 222, and then the introduction plate 222 is separated from the bottom plate 221, so that the capacitor products to be inspected 7 are arranged in an array on the bottom plate 221. In addition, the welding quality inspection system for capacitor products of this embodiment also includes a carrier 6 for placing the bottom plate 221, and the carrier 6, the flux tank 3 and the tin furnace 4 are sequentially arranged below the conveying device 1; the manipulator clamp 13 is provided with a number of clamps consistent with the number of capacitor products 7 to be inspected distributed in an array. When conducting welding quality inspection, the base plate 221 is placed on the carrier 6, and the manipulator fixture 13 clamps the capacitor product 7 to be inspected on the base plate 221 and sends it to the flux tank 3, the tin furnace 4 and the six-sided external inspection machine 5 in turn. It can be understood that the setting of the distribution fixture 22 can limit the number and position of the capacitor products 7 to be inspected, and can avoid the need for the manipulator fixture 13 and the three-dimensional moving mechanism 12 to repeat the setting procedure when inspecting each batch of capacitor products, thereby simplifying the inspection process and saving costs. Furthermore, the carrier 6 is provided with a calibration area for calibrating the position of the base plate 221. When the base plate 221 is placed on the carrier 6, it is convenient to align the base plate 221 with the manipulator fixture 13, thereby improving work efficiency.

[0060] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0061] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A welding quality detection method for capacitor products, characterized in that: The steps include: Step S1: Batch sorting of capacitor products to be tested; Step S2: placing the capacitor products to be tested after batch sorting in an array; Step S3: The conveying device delivers the capacitor products to be tested, which are arranged in an array, to the flux tank, the tin furnace and the six-sided external inspection machine in sequence according to the set program; Step S4: obtaining image data of the capacitor product to be inspected by the six-surface inspection machine; Step S5: Analyze the image data to obtain the tinning rate of each surface of the capacitor product to be tested and the cracking of the porcelain body; Step S6: If the tinning rate of each surface of the capacitor product to be tested is greater than 95% and the ceramic body is not cracked, it is qualified.

2. The welding quality detection method for capacitor products according to claim 1, characterized in that: The method further includes step S7: re-welding the unqualified capacitor products in step S6 and then sending them to the six-side external inspection machine, and repeating the operations from step S2 to step S5 until the capacitor products pass the inspection.

3. The welding quality detection method for capacitor products according to claim 1, characterized in that: In the step S4, when the capacitor product is subjected to solderability inspection, the six-surface inspection machine obtains image data of the capacitor product to be inspected after being coated with solder flux and immersed in a tin furnace at 245° C. for 5±0.5 s.

4. The welding quality detection method for capacitor products according to claim 1, characterized in that: In the step S4, when the capacitor product is subjected to solderability inspection, the six-surface inspection machine obtains image data of the capacitor product to be inspected after being coated with solder flux and immersed in a tin furnace at 275° C. for 5±0.5 s.

5. A welding quality detection system for capacitor products, characterized in that: It includes a conveying device and a capacitor product sorting device, a flux tank, a tin furnace and a six-sided external inspection machine arranged in sequence along the material transportation direction; The capacitor product sorting device is used to sort capacitor products to be tested in batches, and can arrange the capacitors to be tested in an array-like distribution; The flux tank is loaded with flux, which is used to coat the capacitor products to be tested that are arranged in an array. The tin furnace is used to perform soldering on the capacitor product to be tested after being coated with solder flux; The six-surface inspection machine is used to obtain image data of each surface of the capacitor product to be inspected after welding; The conveying device is used to sequentially convey the capacitor products to be inspected that are arranged in an array to the flux tank, the tin furnace and the six-sided external inspection machine.

6. The welding quality detection system for capacitor products according to claim 5, characterized in that: The capacitor product sorting device includes a sorting jig and a distribution jig.

7. The welding quality detection system for capacitor products according to claim 6, characterized in that: The sorting jig includes a first sieve layer and a second sieve layer which are arranged in parallel up and down. The sieve holes of the first sieve layer and the sieve holes of the second sieve layer are staggered. The sieve hole diameter of the first sieve layer is the same as the sieve hole diameter of the second sieve layer. The sieve hole diameter of the first sieve layer and the sieve hole diameter of the second sieve layer are both greater than or equal to d and less than 2d, where d is the short axis length of a single capacitor product; the distance between the first sieve layer and the second sieve layer is less than 2L, where L is the long axis length of a single capacitor product.

8. The welding quality detection system for capacitor products according to claim 6, characterized in that: The distribution fixture comprises a bottom plate and an introduction plate, wherein the introduction plate is detachably connected to the top of the bottom plate, and a plurality of capacitor positioning holes arranged in an array are provided on the introduction plate.

9. The welding quality detection system for capacitor products according to claim 8, characterized in that: The conveying device comprises a top frame, a three-dimensional moving mechanism and a manipulator clamp for clamping the capacitive product to be detected, and the manipulator clamp is installed on the top frame through the three-dimensional moving mechanism.

10. The welding quality detection system for capacitor products according to claim 8, characterized in that: It also includes a carrier for placing the base plate, and the carrier, the flux tank and the tin furnace are arranged in sequence below the conveying device; the carrier is provided with a calibration area for calibrating the position of the base plate.

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