CN114608738B - Tension detection device and tension test system - Google Patents
Tension detection device and tension test system Download PDFInfo
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- CN114608738B CN114608738B CN202210391332.1A CN202210391332A CN114608738B CN 114608738 B CN114608738 B CN 114608738B CN 202210391332 A CN202210391332 A CN 202210391332A CN 114608738 B CN114608738 B CN 114608738B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention relates to the field of electronics, in particular to a tension detection device, which comprises a heating platform, a test board, a tin-plated block, a tension measurer and a driving device for driving the tension measurer to move; the heating platform comprises a heating surface which is horizontally arranged; the test board is detachably fixed on the heating surface, a bonding pad is formed on the test board, and solder paste is coated on the bonding pad; the tin plating block is fixed at the lower end of the tension measurer, and the tension measurer can drive the tin plating block to move in the horizontal direction and the vertical direction so as to press the lower end of the tin plating block into the tin paste on the bonding pad; the method solves the technical problems of tedious tension evaluation, long time consumption and large error of the solder pastes of different models at different temperatures.
Description
Technical Field
The invention relates to the field of electronics, in particular to a tension detection device and a tension test system.
Background
With the development of miniaturization and chip mounting of electronic components, more and more circuit boards need to adopt a product design of double-sided solder paste, namely, solder paste welding is carried out on the double sides of the circuit boards, so that chip devices are welded on the double sides of the circuit boards; the existing double-sided solder paste welding needs twice reflow soldering, and the twice reflow soldering causes great consumption of space and time, and cannot meet the requirements of low energy consumption and high efficiency; the improvement scheme is that the printing and mounting of two sides are combined by combining the flap technology and the reflow soldering technology adjustment, and then the reflow soldering is directly carried out on the two sides of the PCB, namely the two sides of the PCB are simultaneously soldered; the PCB is re-melted, the paster on the lower side is subjected to downward gravity, and after the solder paste is melted, the tension of the solder to the device is necessarily greater than the gravity of the device; because the types of the solder pastes and the welding temperature are different, the tension of the solder pastes is also different, and the tension of the solder pastes of different types at different temperatures needs to be evaluated; the existing method for evaluating the tension of different types of solder pastes at different temperatures is complicated, requires great labor and time, and has great evaluation error, thus resulting in low efficiency.
In view of the above problems, no effective solution has been proposed.
Disclosure of Invention
In order to solve the technical problems of tedious tension evaluation, long time consumption and large error of different types of solder pastes at different temperatures, a tension detection device and a tension test system are provided;
on one hand, the device comprises a heating platform, a test board, a tin-plated block, a tension measurer and a driving device for driving the tension measurer to move;
the heating platform comprises a heating surface which is horizontally arranged;
the test board is detachably fixed on the heating surface, a bonding pad is formed on the test board, and solder paste is coated on the bonding pad;
and a solder block fixed to a lower end of the tension measuring device, wherein the driving device can drive the tension measuring device to move in a horizontal direction and a vertical direction so that the lower end of the solder block is pressed into the solder paste on the pad.
Preferably, the test board is a PCB, a plurality of identical bonding pads are formed on the upper surface of the PCB, the bonding pads are circular, and the solder paste coating area is consistent with the bonding pads.
Preferably, the driving device comprises a first screw rod module which is vertically arranged and a second screw rod module which is horizontally arranged; the first screw rod module comprises a first motor, a first sliding seat and a first guide rail, and the first motor drives the first sliding seat to slide on the first guide rail; the second screw rod module comprises a second motor, a second sliding seat and a second guide rail, and the second motor drives the second sliding seat to slide on the second guide rail;
the second lead screw module is arranged on the first sliding seat; the tension measuring device is connected with the second sliding seat.
Preferably, the tension measurer comprises a fixed end and a measuring end, and the fixed end is connected with the second sliding seat; the tinning block is detachably arranged at the measuring end of the tension measurer.
Preferably, the measuring end is connected with a screw rod perpendicular to the heating surface;
the tinning block is a cylindrical copper block, the tinning block is vertically arranged, a threaded hole matched with the screw rod is formed in the upper end face of the tinning block, and the measuring end is connected with the screw rod through the threaded hole.
Preferably, the heating temperature T of the heating platform is adjustable, and the adjusting range is more than or equal to 25 ℃ and less than or equal to 300 ℃.
Preferably, the tension detection device further comprises a temperature detection module, and the temperature detection module is used for detecting the temperature value of the heating platform.
On the other hand, the tension testing system comprises the tension detecting device, and the tension detecting device further comprises a data transmission module, a data processing module and a display;
the data transmission module is used for transmitting the tension data detected by the tension detection device to the data processing module;
the data processing module is used for processing the tension data to obtain a tension-temperature curve and displaying the tension-temperature curve on a display.
Preferably, a method for performing a tension test by a tension test system is provided, wherein the test method,
s1: coating solder paste on the circular bonding pad;
s2: fixing a test plate on the heating platform;
s3: setting the heating temperature of the heating platform as T1, and controlling the heating platform to heat;
s4: installing a tinning block, controlling a tension detector to move and pressing the lower end face of the tinning block into molten tin paste on a bonding pad when the temperature of a heating plane of a heating platform reaches a set temperature T1, controlling the tension detector to vertically move upwards until the tinning block is separated from the bonding pad, and measuring tension F1 by the tension detector and transmitting the tension F1 to a data processing module;
s5: gradually increasing the set temperature T, and then repeating the step S4, wherein in the step S4, the tension detector measures a plurality of tension values F corresponding to different temperatures T one by one and transmits the tension values F to the data processing module;
s6: the data processing module automatically obtains a temperature-tension curve of the same type of solder paste according to a plurality of groups of one-to-one corresponding temperature values T and tension values F.
Preferably, different types of solder pastes are replaced, the tensile force of the solder paste of the type is detected, and a temperature-tension curve of the solder paste of the type is obtained.
According to the invention, the PCB is accurately heated through the temperature-adjustable heating platform, so that the accurate control of the temperature of the PCB is ensured, the accurate tension is ensured by arranging the tension tester, the constant contact area between the tin-plated block and the tin paste is ensured by coating the tin paste on the circular pad, the test accuracy is ensured, and the detachable structure is arranged between the tin-plated block and the tension tester, so that the speed of replacing the tin-plated block is improved, and the test efficiency is improved; through the setting and the cooperation of above-mentioned technical characteristics can be more accurate and swift the tensile size of the tin cream of different models under the temperature of difference.
Drawings
FIG. 1 is a front cross-sectional view of an embodiment of the present invention;
FIG. 2 is an enlarged view of the portion A in FIG. 1 according to an embodiment of the present invention;
FIG. 3 is a front cross-sectional view of a tinned block according to an embodiment of the invention;
FIG. 4 is a flowchart of a tension test according to an embodiment of the present invention;
FIG. 5 is a schematic view of a "temperature-tension" curve according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a tension testing system according to an embodiment of the present invention.
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention and do not constitute a limitation of the invention.
In the drawings: in the drawings: 1-a heating platform; 2-test plate; 3-tin block plating; 4-a tension measurer; 5-a pad; 6-a first screw rod module; 7-a second lead screw module; 8-a display; 401-a fixed end; 402-a measurement end; 403-screw rod; 301-threaded hole; 601-a first electric machine; 602-a first slide; 701-a second motor; 702-a second carriage.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in other sequences than those illustrated or described herein. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.
As shown in fig. 1 to 6, a tension detecting apparatus is characterized by comprising a heating platform 1, a test board 2, a tinning block 3, a tension measurer 4 and a driving device for driving the tension measurer 4 to move; the heating platform 1 comprises a heating surface which is horizontally arranged, the heating temperature T of the heating platform 1 is adjustable, and the adjusting range is more than or equal to 25 ℃ and less than or equal to 300 ℃; the tension detection device also comprises a temperature detection module, and the temperature detection module is used for detecting the temperature value of the heating platform 1; the temperature is adjusted through the adjustable heating platform 1, and the temperature of the heating platform 1 is detected through the temperature detection module, so that the test plate 2 can accurately reach the set temperature; the test board 2 is detachably fixed on the heating surface, so that the test board 2 is convenient to replace, a bonding pad 5 is formed on the test board 2, and solder paste is coated on the bonding pad 5; the tin paste is coated on the bonding pad 5, so that the contact area between the tin-plated block 3 and the tin paste can be guaranteed to be constant, the tin-plated block 3 is preferably a copper block, the surface of the tin-plated block is coated with OSP (organic solderability preservative), the tin-plated block 3 is fixed at the lower end of the tension measurer 4, and the driving device can drive the tension measurer 4 to move in the horizontal direction and the vertical direction so that the lower end of the tin-plated block 3 is pressed into the tin paste on the bonding pad 5; the tensile force measurer 4 is driven to move through the driving device, the tinned block 3 is driven to move faster and at higher temperature and is pressed into the solder paste on different bonding pads 5, and the efficiency is improved.
Further preferably, as shown in fig. 2, the test board 2 is a PCB, a plurality of identical pads 5 are formed on the upper surface of the PCB, the pads 5 are circular, and the solder paste coating area is the same as that of the pads 5; the round pad 5 is beneficial to ensuring the contact area of the tin-plated block 3 and the solder paste, and the tension of the solder paste in a unit can be more accurately tested; the arrangement of the plurality of bonding pads 5 is convenient, the temperature of the heating platform 1 is adjusted under the condition that the test board 2 is not replaced, the tension of the solder paste at different temperatures can be tested, and the test is convenient and quick.
Further preferably, as shown in fig. 1, the driving device includes a first lead screw module 6 vertically arranged and a second lead screw module 7 horizontally arranged; the first lead screw module 6 comprises a first motor 601, a first slide carriage 602 and a first guide rail 603, wherein the first motor 601 drives the first slide carriage 602 to slide on the first guide rail 603; the second lead screw module 7 includes a second motor 701, a second slide carriage 702 and a second guide rail 703, and the second motor 701 drives the second slide carriage 702 to slide on the second guide rail 703; the second lead screw module 7 is arranged on the first sliding base 602; the tension measuring device is connected with the second sliding seat 702; through two sets of lead screw module drive tension measuring device removal, adjustment tension measuring device's that can be more accurate position, also can be more steady make tinning block 3 upwards remove and with the separation of tin cream simultaneously, further improvement measurement accuracy.
Further preferably, as shown in fig. 1 to 3, the tensile force measurer 4 includes a fixed end 401 and a measuring end 402, the measuring end 402 is connected with a screw 403 perpendicular to the heating surface, the tinned block 3 is a cylindrical copper block, the tinned block 3 is vertically arranged, a threaded hole 301 matched with the screw 403 is formed on the upper end surface of the tinned block 3, and the measuring end 402 and the screw 403 are detachably connected together through the threaded hole 301, so that the tinned block 3 is conveniently replaced, and the efficiency is improved; the fixed end 401 is connected with the second sliding base 702; because the tin cream is liquid after the heating, forms circularly under the effect of self tension, and the cylindrical 3 lower extremes of tinning piece of vertical setting are corresponding with circular pad 5, and when 3 lower extremes of tinning piece impressed the tin cream, the tension of tin cream was more balanced between pad 5 and tinning piece 3, and the tension value of so testing is more accurate.
The invention also provides a tension testing system, which comprises a tension detecting device, a data transmission module, a data processing module and a display 8, wherein the tension detecting device comprises the data transmission module, the data processing module and the display 8; the data transmission module is used for transmitting the tension data detected by the tension detection device to the data processing module; as shown in fig. 5, the data processing module is configured to process the tension data to obtain a "tension-temperature" curve, and display the "tension-temperature" curve on the display 8; through this tension test system, can be more convenient carry out statistical analysis to the result of test, also more audio-visual let the staff observe the test result, and then conveniently carry out effective aassessment to the tension of tin cream.
Further preferably, the invention also designs a set of test method,
s1: coating solder paste on the circular bonding pad 5;
s2: fixing a test plate 2 on the heating platform 1;
s3: setting the heating temperature of the heating platform 1 as T1, and controlling the heating platform 1 to heat;
s4: installing a tinning block 3, controlling a tension detector to move and pressing the lower end face of the tinning block 3 into molten tin paste on one bonding pad 5 when the temperature of a heating plane of the heating platform 1 reaches a set temperature T1, controlling the tension detector to vertically move upwards until the tinning block 3 is separated from the bonding pad 5, and measuring tension F1 by the tension detector and transmitting the tension F1 to a data processing module;
s5: gradually increasing the set temperature T, and then repeating the step S4, wherein in the step S4, the tension detector measures a plurality of tension values F corresponding to different temperatures T one by one and transmits the tension values F to the data processing module;
s6: the data processing module automatically obtains a temperature-tension curve of the same type of solder paste according to a plurality of groups of one-to-one corresponding temperature values T and tension values F;
by the method, the tensile force testing system can detect the tensile force of the solder paste more efficiently and safely.
Preferably, the solder pastes of different models are replaced, the tension detection of the solder paste of the model is carried out, and the temperature-tension curve of the solder paste of the model is obtained; therefore, the tension values of the solder pastes of different models at different temperatures can be obtained.
As shown in FIG. 4, when the device of the present invention is used, the solder paste of the same specification is coated on each circular bonding pad 5 on the test board 2, the solder paste covers the upper surface of the circular bonding pad 5, and the test board 2 is fixed on the heating plane of the heating platform 1 by the high temperature adhesive paper;
setting the heating temperature of the heating platform 1 as T1, and controlling the heating platform 1 to heat; fixing a first tin-plated block 3 on a screw 403 of a measuring end 402 through a threaded hole 301; when the temperature of the heating plane of the heating platform 1 reaches a set temperature T1, controlling the second motor 701 to work, driving the sliding seat to slide on the second guide rail 703 by the second motor 701, driving the tension measuring measurer to move in the direction of the second guide rail 703 so that the tin-plated block 3 is just positioned right above one bonding pad 5 by the second sliding seat 702, stopping the rotation of the second motor 701 at the moment, controlling the first motor 601 to work, driving the first sliding seat 602 to move downwards by the first motor 601, driving the second lead screw module 7 to move downwards along the first guide rail 603 so that the lower end of the tin-plated block 3 is pressed into molten tin paste, then controlling the first motor 601 to slide the first sliding seat 602 upwards, driving the second lead screw module 7 to move upwards by the first sliding seat 602, and enabling the tin-plated block 3 to move upwards along the second lead screw module 7;
in the process that the tin plating block 3 moves upwards to separate the tin plating block 3 from the tin paste, the measuring end 402 of the tension measurer 4 is required to bear the gravity action of the screw 403 and the tin plating block 3 and also be under the tension action of the molten tin paste; the gravity value of the screw 403 and the tinning block 3 is subtracted from the tension value borne by the measuring end 402 of the tension measurer 4 to obtain the tension value F1 of the tin paste of the type at the temperature of T1, and the data transmission module transmits the tension value F1 to the data processing module;
after the tin plating block 3 is separated from the tin paste, the set temperature of the heating platform 1 is raised to T2, and the heating platform 1 is controlled to heat; the second lead screw module 7 drives the tin-plated block 3 group to continuously move upwards for a certain distance and then stops, the first tin-plated block 3 is replaced by a second tin-plated block 3, then the process of tension detection of the first tin-plated block 3 is repeated, and the obtained tension value F2 is transmitted to the data processing module through the transmission module;
repeating the tension detection process to obtain different tensions F of the same specification of the solder paste at different temperatures, and inputting the tensions F into the data processing module through the transmission module;
the data processing module and the plurality of groups of temperature values T and tension values F which correspond one to one obtain the temperature-tension curve of the solder paste of the same model according to the preset program and display the temperature-tension curve on the display 8, so that the tester can observe and evaluate the solder paste conveniently.
When the tension values of the solder pastes of different models need to be tested, the test board 2 is replaced, the solder paste is coated on the bonding pad 5 of the replaced test board 2, the same test is carried out, and thus, the temperature-tension curve of the solder paste of another model can be obtained.
The invention has the following remarkable advantages:
1. according to the invention, the PCB is heated through the heating platform 1, the heating platform 1 has a temperature regulation function, so that the accurate control of the temperature of the PCB is ensured, the tin-plated block 3 and the tension measurer 4 are detachably arranged, so that the tin-plated block 3 is better plated, the test efficiency is improved, the cylindrical pad 5 is favorable for accurately controlling the contact area between the tin paste and the tin-plated block 3, the tin paste is favorably subjected to chemical reaction after being melted to form an alloy layer, further, the tension test after the tin paste is melted is favorably carried out, the tension measurement can be more accurately measured through the tension measurer 4, the tin-plated block 3 can be more quickly moved through the matching of the first lead screw module 6 and the second lead screw module 7, and the tin-plated block 3 is accurately corresponding to the pad 5; through the setting and the cooperation of above-mentioned technical characteristics can be more accurate and swift the tensile size of the tin cream of different models under the temperature of difference.
2. According to the invention, the data transmitting device is arranged on the tension measurer 4, the data receiving device is arranged in the data processing system to receive tension data transmitted by the data transmitting device on the tension measurer 4, and the data processing system fits the received tension data and the input temperature data according to a preset program to form a tension-temperature curve and displays the curve on the display 8, so that on one hand, the data is processed more accurately and efficiently, on the other hand, the result is more visual, and the tension of the solder paste in different models and at different temperatures can be evaluated.
Exemplary embodiments of the present disclosure are specifically shown and described above. It is to be understood that the disclosure is not limited to the precise construction, arrangements, or implementations described herein; on the contrary, the disclosure is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (9)
1. A tension detection device is characterized by comprising a heating platform (1), a test plate (2), a tinning block (3), a tension measurer (4) and a driving device for driving the tension measurer (4) to move;
the heating platform (1) comprises a heating surface which is horizontally arranged, and the temperature of the heating surface is adjustable;
the tension detection device further comprises a temperature detection module, and the temperature detection module is used for detecting the temperature value of the heating platform (1);
the testing plate (2) is detachably fixed on the heating surface, a plurality of identical bonding pads (5) are formed on the testing plate (2), and solder paste is coated on each bonding pad (5) so that the temperature of the heating platform (1) can be adjusted under the condition that the testing plate (2) is not replaced, and the tension of the solder paste at different temperatures can be tested;
the tin-plated block (3) is fixed at the lower end of the tension measurer (4), the driving device can drive the tension measurer (4) to move in the horizontal direction and the vertical direction so as to enable the lower end of the tin-plated block (3) to be pressed into tin paste on the welding pad (5), the tension detector is controlled to vertically move upwards until the tin-plated block (3) is separated from the welding pad (5), and the tension measurer (4) completes measurement of the tension of the tin paste.
2. A tension sensing device according to claim 1, wherein the test board (2) is a PCB board, a plurality of identical pads (5) are formed on the upper surface of the PCB board, the pads (5) are circular, and the solder paste application area is identical to the pads (5).
3. A tension detecting device according to claim 1, wherein the driving device comprises a first lead screw module (6) arranged vertically and a second lead screw module (7) arranged horizontally; the first screw rod module (6) comprises a first motor (601), a first sliding seat (602) and a first guide rail (603), wherein the first motor (601) drives the first sliding seat (602) to slide on the first guide rail (603); the second screw rod module (7) comprises a second motor (701), a second sliding seat (702) and a second guide rail (703), and the second motor (701) drives the second sliding seat (702) to slide on the second guide rail (703);
the second screw rod module (7) is arranged on the first sliding seat (602); the tension measuring device is connected to the second carriage (702).
4. A tension sensing device as claimed in claim 3, wherein the tension measurer (4) comprises a fixed end (401) and a measuring end (402), the fixed end (401) being connected to the second carriage (702); the tin-plated block (3) is detachably arranged at the measuring end (402) of the tension measurer (4).
5. A tension sensing device as claimed in claim 4, wherein the measuring end (402) is connected to a screw (403) perpendicular to the heating surface;
the tin-plated block is a cylindrical copper block, the tin-plated block (3) is vertically arranged, a threaded hole (301) matched with the screw rod (403) is formed in the upper end face of the tin-plated block (3), and the measuring end (402) is connected with the screw rod (403) through the threaded hole (301).
6. A tension detection device as claimed in claim 5, characterized in that the heating temperature T of the heating platform (1) is adjustable within a range of 25 ℃ to T300 ℃.
7. A tension testing system, characterized in that it comprises a tension detecting device according to any one of claims 1 to 6, said tension detecting device further comprising a data transmission module, a data processing module and a display (8);
the data transmission module is used for transmitting the tension data detected by the tension detection device to the data processing module;
the data processing module is used for processing the tension data to obtain a tension-temperature curve and displaying the tension-temperature curve on a display (8).
8. A method of tension testing using the tension testing system of claim 7,
s1: coating solder paste on the circular bonding pad (5);
s2: fixing a test plate (2) on the heating platform (1);
s3: setting the heating temperature of the heating platform (1) as T1, and controlling the heating platform (1) to heat;
s4: installing a tinning block (3), controlling a tension detector to move and pressing the lower end face of the tinning block (3) into molten tin paste on a bonding pad (5) when the temperature of a heating plane of a heating platform (1) reaches a set temperature T1, controlling the tension detector to vertically move upwards until the tinning block (3) is separated from the bonding pad (5), and measuring tension F1 by the tension detector and transmitting the tension F1 to a data processing module;
s5: gradually increasing the set temperature T, then repeating the step S4, and in the step S4, measuring a plurality of tension values F corresponding to different temperatures T one by the tension detector and transmitting the tension values F to the data processing module;
s6: the data processing module automatically obtains a temperature-tension curve of the same type of solder paste according to a plurality of groups of one-to-one corresponding temperature values T and tension values F.
9. A tension testing method performed by the tension testing system as claimed in claim 8, wherein different types of solder pastes are replaced, the tension detection of the type of solder paste is performed, and a "temperature-tension" curve of the type of solder paste is obtained.
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| CN202210391332.1A CN114608738B (en) | 2022-04-14 | 2022-04-14 | Tension detection device and tension test system |
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| CN202210391332.1A CN114608738B (en) | 2022-04-14 | 2022-04-14 | Tension detection device and tension test system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4533540B2 (en) * | 2001-01-12 | 2010-09-01 | 株式会社マルコム | Solder paste characteristics test method |
| CN206292133U (en) * | 2016-12-30 | 2017-06-30 | 东莞市吉田焊接材料有限公司 | A kind of solder(ing) paste viscosity detecting device |
| CN207779852U (en) * | 2018-01-15 | 2018-08-28 | 昆山琉明光电有限公司 | The automatic check machine of tin cream viscosity |
| CN211465218U (en) * | 2019-11-14 | 2020-09-11 | 桂林电子科技大学 | Test equipment |
| CN110842385A (en) * | 2019-11-14 | 2020-02-28 | 桂林电子科技大学 | Test apparatus and control method of test apparatus |
| CN112082940A (en) * | 2020-09-02 | 2020-12-15 | 山东司莱美克新材料科技有限公司 | Method for testing bonding force pull-off of ceramic plate |
| CN214374083U (en) * | 2020-12-28 | 2021-10-08 | 广州先艺电子科技有限公司 | Viscosity measuring device for trace solder paste |
| CN112834724A (en) * | 2021-03-05 | 2021-05-25 | 芯钛科半导体设备(上海)有限公司 | Soldering paste solderability testing device and testing method under simulated reflow temperature curve |
| CN113687211A (en) * | 2021-07-21 | 2021-11-23 | 桂林研创半导体科技有限责任公司 | Printed circuit board pad drawing method |
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